Preprints INFN - Library LNF
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attività di ricerca teoriche o sperimentali effettuate
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compilando gli appositi moduli:
modulo LNF,
modulo INFN.
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è soggetta al seguente
iter autorizzativo.
Il testo completo delle note è disponibile in formato PDF.
Il catalogo NOTE LNF include tutte le note LNF dal 1953
ad oggi, mentre il catalogo NOTE INFN include quelle dal
1987 ad oggi.
| ID | Data | Titolo | Anno | Autori | Abstract | |
|---|---|---|---|---|---|---|
| 6009 | 2026-10-09 | The INFN Performance Application - Spec-driven AI development and application specification | 2026 | INFN-2026-06-DSI.pdf | Giorgia Bernabucci, Mauro Gattari, Marta Perucci, Francesco Serafini | Performance is a Spring Boot microservice implementing the backend of the INFN Ciclo della Performance (Performance Cycle). It supports the yearly process of assigning, monitoring and evaluating individual and organizational performance, in conformance with INFN's Sistema di Misurazione e Valutazione della Performance (SMVP)[2]. It replaces the previous StrategicPA platform with a single, web-based, integrable backend that governs the whole annual cycle. The service keeps one evaluation sheet per employee and year, created from GODiVA, the INFN source system for personnel and organizational data. A sheet holds the individual objectives, each measured by a catalog indicator and monitored at two checkpoints, and moves through a nine-state workflow from draft to closure. At completion the final score combines organizational performance, individual objectives and organizational behaviors by category weight, and determines the evaluation band and the reward factor. Access derives from INFN memberships and per-sheet responsibilities; every sheet change is audited. The application was built spec-first with Spec-Kit[3] and AI coding agents: each feature started as a testable specification, had its ambiguities resolved in writing, and was planned against a project constitution before any code was written, with the work traced to Jira. This note has two parts: • Part I — Spec-Driven Development documents how the application is built: the spec-driven method, the toolchain, and the governance that keeps specification, planning, and implementation aligned. • Part II — Application Specification documents what is built: the application as it behaves today —vision, actors, domain model, workflow, user stories, and functional / non-functional requirements. The two parts read differently, by design. Part I stays at the level of process; Part II is a functional overview of the implemented application. It names representative domain states, fields, endpoints, and rules where that makes the behavior clearer, but it is not an exhaustive API or audit contract. Keywords — performance management · spec-driven development · executable specification · |
| 6010 | 2026-10-09 | The INFN Performance Application - Spec-driven AI development and application specification | 2026 | INFN--2026-06--DSI.pdf | Giorgia Bernabucci, Mauro Gattari, Marta Perucci, Francesco Serafini | Performance is a Spring Boot microservice implementing the backend of the INFN Ciclo della Performance (Performance Cycle). It supports the yearly process of assigning, monitoring and evaluating individual and organizational performance, in conformance with INFN's Sistema di Misurazione e Valutazione della Performance (SMVP)[2]. It replaces the previous StrategicPA platform with a single, web-based, integrable backend that governs the whole annual cycle. The service keeps one evaluation sheet per employee and year, created from GODiVA, the INFN source system for personnel and organizational data. A sheet holds the individual objectives, each measured by a catalog indicator and monitored at two checkpoints, and moves through a nine-state workflow from draft to closure. At completion the final score combines organizational performance, individual objectives and organizational behaviors by category weight, and determines the evaluation band and the reward factor. Access derives from INFN memberships and per-sheet responsibilities; every sheet change is audited. The application was built spec-first with Spec-Kit[3] and AI coding agents: each feature started as a testable specification, had its ambiguities resolved in writing, and was planned against a project constitution before any code was written, with the work traced to Jira. This note has two parts: • Part I — Spec-Driven Development documents how the application is built: the spec-driven method, the toolchain, and the governance that keeps specification, planning, and implementation aligned. • Part II — Application Specification documents what is built: the application as it behaves today —vision, actors, domain model, workflow, user stories, and functional / non-functional requirements. The two parts read differently, by design. Part I stays at the level of process; Part II is a functional overview of the implemented application. It names representative domain states, fields, endpoints, and rules where that makes the behavior clearer, but it is not an exhaustive API or audit contract. Keywords — performance management · spec-driven development · executable specification · Spring Boot microservice · REST API design · INFN SMVP · evaluation workflow · traceability DOI n. 10.15161/oar.it/n74ax-cfh13 |
| 6008 | 2026-10-08 | P.A.S.T.E. Project - MODELLO DI ARBITRAGGIO DEI FLUSSI DI AUTOMAZIONE BASATO SU LOGICHE DISCREZIONALI PER LE ESECUZIONI IN REGIME DI PARALLELISMO O SEQUENZIALITA’ | 2026 | INFN-2026-05-AC.pdf | Nunzio Amanzi | Abstract L’automazione dei processi per l’attuazione di workflow complessi in ambienti operativi multiutente richiede particolare attenzione alle logiche di trattamento e transazione dei dati. Sulla base delle esigenze istruttorie, dall’analisi delle meccaniche di automazione nella piattaforma cloud aziendale Microsoft 365 emergono criticità che potrebbero compromettere la coerenza degli output di processo rispetto alle eventuali azioni concorrenti attuate dagli utenti. Partendo da un caso di studio di implementazione di una soluzione tecnologica on cloud, nell’ottica di salvaguardare e arbitrare il parallelismo di esecuzione dei processi, è stato progettato un modello di sviluppo che ridefinisce gli scenari e i livelli di automazione, superando i limiti delle logiche basate su trigger. |
| 6004 | 2026-08-03 | RENATO: FROM SCANNED LEGACY SCHEMATICS TO AN INSTALLABLE FAULT-SEARCH KNOWLEDGE BASE An AI-Curated Documentation Pipeline for a Particle-Accelerator Control Room | 2026 | INFN-2026-04-LNF.pdf | Claudio Di Giulio, Giulia Latini | Many accelerator facilities operate hardware whose only surviving documentation is a collection of scanned, image-only electrical schematics with no extractable text and no explicit cross-referencing. This paper describes the design and implementation of RENATO (Repository of Engineering Notes, Analysis, Troubleshooting, and Orchestration), an offline, installable knowledge base and search tool built from the 189 scanned schematics of the TITAN system on the DAFNE LINAC at INFN-LNF. A team of AI agents was used to read each schematic visually, produce structured technical documentation, and synthesize a cross-schematic fault-diagnosis map; the resulting corpus was then indexed with a lightweight, dependency-minimal full-text search stack (SQLite FTS5, a Python standard-library HTTP server, Jinja2 templates) and packaged for offline installation on a Windows or Linux control-room PC, with a defined integration path into a Phoebus operator panel. A central design decision is discussed in detail: AI was deliberately confined to an offline, batch knowledge-curation role rather than deployed as a live conversational interface, in order to preserve determinism, auditability, and independence from any specific AI vendor at the point of use – properties considered more important than conversational flexibility in a safety-relevant control-room maintenance context. The paper presents the multi-agent methodology, the resulting system architecture, the packaging and deployment strategy, and the rationale behind the human/AI division of labor |
| 6003 | 2026-06-25 | Particle accelerators as a path to intergovernmental collaboration: the case of the first electron positron collider and the power of theoretical physics | 2026 | INFN-2026-03-LNF.pdf | Giulia Pancheri INFN Frascati National Laboratories, Via Enrico Fermi 56, Frascati, 00044, Italy – giulia.pancheri@lnf.infn.it | I revisit the history of the first matter-antimatter collider built in Italy in 1960 and carried to success through an inter-European collaboration with France, underlying the foundational role of the Austrian born theoretical physicist Bruno Touschek. Touschek’s life path through Europe before and after World War II is briefly recalled. The role of CERN in jump-starting this international collaboration between the Frascati National Laboratories in Italy and the Laboratoire de l’Accélérateur Linéaire d’Orsay in France is highlighted through historical documents, and contributions from interviews with the main protagonists of Touschek’s game-changing proposal. |
| 6002 | 2026-05-18 | Integrazione del logbook elettronico OLOG nei sistemi di controllo dei Laboratori Nazionali di Frascati | 2026 | INFN-2026-02-LNF.pdf | Giovanni Lorenzo Napoleoni, Michele Antonio Tota, Ramon Orrú, Andrea Michelotti, Eleonora Diociaiuti, Clara Taruggi, Luca Gennaro Foggetta | Nei sistemi di controllo per acceleratori e apparati sperimentali dei Laboratori Nazionali di Frascati è stato adottato il framework Phoebus (CS-Studio), che, oltre alle funzionalità di controllo di base, fornisce una serie di servizi applicativi aggiuntivi, tra cui OLOG (Online Logbook), Save & Restore e Archiver Appliance. Scopo del presente lavoro è l’integrazione di OLOG nell’architettura dei servizi software INFN, adottando le linee guida istituzionali per lo sviluppo di servizi software all’interno dell’Ente. In particolare, l’integrazione ha richiesto l’adozione dei protocolli OAuth 2.0 e OpenID Connect — standard di riferimento per la gestione dell’autenticazione e dell’autorizzazione — al fine di centralizzare il flusso di autenticazione e abilitare il Single Sign-On tra tutti i servizi Phoebus. Il caso d’uso considerato è il deployment presso la Beam Test Facility (BTF) dei LNF, dove la soluzione è stata attivata in ambiente di produzione |
| 6001 | 2026-02-08 | EuPRAXIA@SPARC_LAB Technical Design Report | 2026 | INFN-2026-01-LNF.pdf | D. Alesini1, M. P. Anania1, F. Anelli1, P. Angeletti1, M. Angelucci1, G. Armenti1, M. Arpaia1, R. Assmann2, L. Avaldi3, A. Bacci4, C. Badiali5, A. Balerna1, I. Balossino1, M. Bellaveglia1, A. Biagioni1, D. Bleiner6, P. Bolognesi3, C. Bortolin1, F. Bossi1, B. Buonomo1, L. Cacciotti1, P. Campana1, M. Campolucci1, G. Campri7,8, S. Cantarella1, L. B. D. Capuano1, F. Cardelli1, M. Carillo1, L. Carlini3, A. Casamatta1, G. Catuscelli1, M. Ceccarelli1, R. Ceccarelli1, V. Ceccarelli1, A. Cecchinelli1, E. Chiadroni1,7, F. Chiarelli1, J. Chiarinelli3, P. Chimenti1, D. Chiti1, A. Cianchi9,10, M. Cianfrini1, R. Cimino1, F. Cioeta1, G. A. P. Cirrone11, R. Clementi1, L. Crincoli1, M. Coreno1,12, G. Costa1, F. Curciarello13, A. Curcio7,14, G. D’Auria8, G. De Bernardis1, A. Del Dotto1, M. Del Franco1, M. Del Giorno1, M. Dell’Angela15, G. Delzeri1, R. Demitra1, F. Demurtas1,7, T. De Nardis1, E. De Santis9,10, M. De Simone15, C. Di Giulio1, S. Di Mitri8, M. Diomede16, E. Di Pasquale1, G. Di Pirro1, G. Di Raddo1, R. Di Raddo1, V. Dompè1, R. Donghia 1, Z. Ebrahimpour1,8, A. Esposito1, L. Faillace1, A. Falone1, X. Fang1,7, M. Ferrario1, G. Franzini1, F. Frisinelli13, F. Galdenzi9,10, F. Galletti1, M. Galletti1, A. Gallo1, M. Gaobardi9,10, A. Ghigo1, L. Giannessi1,8, P. Gianotti1, A. Giribono1, L. Giuliano7,14, L. Gizzi17, G. Grilli1, M. Ianni1, S. Incremona1, L. Ioannucci1, A. Iungo1, F. Iungo1, L. Labate17, G. Latini1, S. Lauciani1, A. Liedl1, M. Loffreda1, V. Lollo1, G. Lombardo1, G. Luminati1, S. Lupi7,14, R. Magnanimi1, A. Marcelli12,18, M. Marchetti1, S. Martelli1, M. Martini1, R. Mascio1, A. Mascioli1, F. Mazzoni1, C. Mencarelli1, A. Michelotti1, M. Migliorati7,14, A. Mostacci7,14, T. Napolitano8, B. Nese1, F. Nguyen1,19, M. Opromolla1, G. Parise1, L. Palumbo7,14, M. Pedio20, D. Pellegrini1, L. Pellegrino1, A. Pesce21, A. Petralia19, M. Petrarca7,14, V. Petrillo4, L. Petrucciani1, G. Piermarini1, L. Piersanti1, S. Pioli1, R. Pompili1, E. Principi8, S. Quaglia1, R. Quaranta1, D. Quartullo1, R. Ricci1, E. Romano1, S. Romeo1, M. Rossetti Conti4, A. R. Rossi4, L. A. Rossi1, J. B. Rosenzweig22, U. Rotundo1, L. Sabbatini1, M. F. Sardone1, M. Scampati1, G. Scarselletta1, L. Serafini4, B. Serenellini1, G. J. Silvi1, L. Spallino1, B. Spataro1, A. Stella1, F. Stellato9,10, A. Stecchi1, F. Stocchi1,9, S. Strabioli1, S. Tocci1, P. Tomassini23, A. Trigilio1, P. Tuscano1, C. Vaccarezza1, A. Vannozzi1, L. Verra1, S. Vescovi1, F. Villa1, C. Zannini1, M. Zarlenga1, A. Zigler24, M. Zottola1 | EuPRAXIA@SPARC_LAB Technical Design Report |
| 5998 | 2025-12-18 | Sealing Strategies for HPGe Detectors Operating in Cryogenic Vacuum Environments:Design, Testing and Performance | 2025 | INFN-2025-09-MI.pdf | G. Secci1,2, A. Capsoni1, L. Manara1, D. Viganò1, S. Capra1,2, W. Raniero3 and S. Coelli1 1 - INFN sezione di Milano 2 - Università degli Studi di Milano 3 - INFN Laboratori Nazionali di Legnaro | Segmented high-purity germanium detectors play a key-role in advanced gamma spectroscopy. However, their technical and manufacturing details are proprietary and not publicly disclosed by industry. To address this gap, INFN launched the N3G Project, aimed at designing new segmented high-purity germanium detectors and developing the technical know-how to independently operate and maintain them. Within this framework, this technical note describes the procedure and instrumentation used to vacuum-seal the capsule containing the HPGe detector, ensuring operation in a controlled environment. |
| 6000 | 2025-12-09 | LNF-BTF vacuum windows production and stress tests | 2025 | INFN-2025-10-LNF.pdf | Bruno Buonomo1, Claudio Di Giulio1, Luca G. Foggetta1, Eleonora Diociaiuti1, Clara Taruggi1, Domenico Di Giovenale1, Andrea Liedl1, Valerio Lollo1, Marco Zottola1, and Lina Quintieri2 1INFN, Laboratori Nazionali di Frascati, V. E.Fermi 54, I-00044 Frascati, Italy 2UKRI-STFC, ISIS neutron and muon source, Rutherford | This internal note presents the fabrication and stress-testing of ultra-thin vacuum windows used to seal the beamline vacuum at the Laboratori Nazionali di Frascati (INFN-LNF) Beam Test Facility (BTF). Several technologies have been employed for different windows applications; the note focuses particularly on windows manufactured from polymer foils and solid aluminium using micrometric milling. Their integrity and durability have been evaluated through vacuum cycling, rapid venting, and beam injection tests. These windows have been in routine operation on different BTF beam lines for several years. |
| 5999 | 2025-12-02 | Controls system update in the Beam Test Facility of the Laboratori Nazionali di Frascati | 2025 | INFN-2025-08-LNF.pdf | Controls system update in the Beam Test Facility of the Laboratori Nazionali di Frascati Bruno Buonomo, Fabio Cardelli, Alessandro D’Uffizi, Domenico Di Giovenale, Riccardo Esposito, Eleonora Diociaiuti, Francesco Galletti, Riccardo Gargana, Luca Gennaro Foggetta, Andrea Michelotti, Giovanni Lorenzo Napoleoni, Clara Taruggi INFN - LNF | Bruno Buonomo, Fabio Cardelli, Alessandro D’Uffizi, Domenico Di Giovenale, Riccardo Esposito, Eleonora Diociaiuti, Francesco Galletti, Riccardo Gargana, Luca Gennaro Foggetta, Andrea Michelotti, Giovanni Lorenzo Napoleoni, Clara Taruggi INFN, Laboratori Nazionali di Frascati, P.O. Box 13, I-00044 Frascati, Italy |
| 5997 | 2025-05-28 | MPS DESIGN FOR TEX FACILITY | 2025 | INFN-25-07-LNF.pdf | G. Latini, S. Pioli, F. Cardelli | This report outlines the design and validation of a prototype Machine Protection System (MPS) for the TEX facility at LNF-INFN. The system aims to protect critical components of the X-band and C-band accelerator lines by monitoring key subsystems and executing interlocks in response to fault conditions. The architecture is based on NI cRIO controllers with FPGA, integrated via EPICS using Channel Access and MODBUS protocols. The design follows the IEC 61508 standard, with defined Safety Instrumented Functions (SIFs) and the corresponding Safety Integrity Levels (SILs) derived from risk analysis. A logic matrix governs the interlock strategy, while real-time control is implemented in LabVIEW. Reliability calculations confirm compliance with safety requirements without redundancy. This MPS prototype provides a robust framework for machine protection, ensuring both equipment integrity and personnel safety. |
| 5996 | 2025-05-23 | INFN INTERNAL NOTES | 2025 | INFN-2025-06-GE.pdf | Salvo Enrico | Questa nota tecnica illustra la migrazione del sistema di accesso remoto utilizzato presso la Sezione INFN di Genova, passando da TightVNC a RustDesk. TightVNC, attualmente in uso, `e un software ormai obsoleto, con limitazioni in termini di sicurezza, prestazioni e supporto per sistemi moderni. La crescente necessit`a di garantire un accesso remoto sicuro, efficiente e facilmente gestibile ha reso necessario valutare soluzioni alternative. RustDesk si è rivelato una scelta adeguata grazie alla sua natura open-source, alla possibilità di implementazione self-hosted e al supporto attivo della comunità. In questo documento vengono descritte le funzionalità principali di RustDesk, i motivi della sua adozione, la procedura di installazione personalizzata adottata presso la Sezione, e un confronto tecnico con TightVNC, evidenziando i vantaggi ottenuti in termini di sicurezza, usabilità e manutenzione. |
| 5995 | 2025-04-15 | CROWN@ELETTRA | 2025 | INFN-2025-05.pdf | Z. Ebrahimpour, M. Teklehawariyat, A. E. A. Mohamed, M. Coreno, S. Dabagov, G.Della Ventura, P. De Padova, M. de Simone, D. Hampai, S.J. Rezvani, A. Marcelli | X-ray imaging can be performed with both hard and soft x-rays, but the latter offer several advantages, e.g., a lower dose, elemental specificity and spectral tunability around the wa-ter window, in particular using brilliant synchrotron radiation sources. Over the years, mi-croscopy has seen major advancements in sources and optics, expanding the already large number of applications. The CROWN project introduces a novel soft X-ray/UV confo-cal layout using two low-cost, compact meta-lenses, i.e., microchannel plates (MCPs) suitable also to perform single-shot photon diagnostics, an important issue for stable plasma-based accelerator operations. This document describes the preliminary tests of the CROWN instrumentation performed at Elettra. |
| 5994 | 2025-04-02 | NOTES ON THE UPDATE OF THE EUROPEAN STRATEGY FOR PARTICLE PHYSICS BY INFN SEZIONE DI ROMA | 2025 | INFN-2025-04-RM1.pdf | This document contains some notes on the update of the European Strategy for Particle Physics, gathered among and discussed by employees and associates of INFN Sezione di Roma. Considerations regarding the future of particle physics in Europe and an analysis of the perspectives of INFN Sezione di Roma in this context are included. | |
| 5993 | 2025-03-21 | Ceph per servizi general purpose | 2025 | INFN-2025-03-LNF.pdf | Ramon Orrù, Giovanni Lorenzo Napoleoni, Michele Antonio Tota | Progettazione, implementazione e benchmarking di un cluster Ceph a supporto dei servizi general purpose offerti dal Servizio Infrastrutturale Calcolo e Reti della Divisione Ricerca dei Laboratori Nazionali di Frascati. L’obiettivo è l’implementazione efficace di un sistema di software defined storage capace di integrarsi con i sistemi già adottati dal Servizio, e di permettere, inoltre, la successiva integrazione con ulteriori sistemi in fase di realizzazione. Nel permettere la fruizione dello spazio allocabile, dovrà essere garantito il più ampio supporto alle modalità d’accesso locale (POSIX distributed filesystem, block device, etc.) e ai comuni protocolli per le storage area network (iSCSI, NFS). Nell’ottica di favorire l’adozione di servizi cloud oriented, sarà auspicabile anche il supporto a protocolli ormai divenuti standard de facto per l’interazione con sistemi di object storage (Amazon S3). L’affidabilità della soluzione e la semplicità nel suo utilizzo saranno cruciali nel permettere la sovrapposizione e la consecutiva sostituzione di alcuni sistemi di storage tradizionali attualmente utilizzati. |
| 5992 | 2025-02-24 | Raoul Gatto and Bruno Touschek: the Rise of e+e− Physics | 2025 | INFN-25-01-LNF.pdf | L.Bonolis, F. Buccella, G. Pancheri | The story of the collaboration between Raoul Gatto and Bruno Touschek, before during and after the construction of AdA, the first electron-positron collider built at the Frascati National Laboratories in 1960, is only partially known. A brief outline is presented here to show how electronpositron physics was influenced by Gatto and Touschek’s common early interest in the CPT theorem. Their legacy is also illustrated with examples of their lasting impact as mentors to their students and collaborators. Starting with the early days after Fermi’s departure, we describe the various physics scenarios behind the beginning of a deep relationship between Touschek and Gatto in Rome in 1953, the years of AdA between Rome, Frascati and Orsay, up to the construction of ADONE, the more beautiful and powerful collider, where multihadron production was first discovered in 1968/69 and the existence of the charm quark was confirmed in 1974. |
| 5990 | 2025-02-18 | ASTAROTH Cryogenic Chamber Design and Test Report | 2025 | INFN-25-02-MI.pdf | Simone Coelli – INFN Milano, Davide D'Angelo – Univ. Milano, Mauro Monti – INFN Milano, Arsenio Palmisano – INFN LASA, Maurizio Todero – INFN LASA, Andrea Zani - INFN Milano | In order to validate the design of the cryogenic chamber of the ASTAROTH experiment, finite element analysis and mechanical material characterisation tests were carried out under cryogenic conditions. This document summarises the results of the analyses and tests conducted jointly by the INFN Milano Design and Mechanical Workshop Service and at the INFN LASA Laboratory. |
| 5989 | 2024-11-26 | Analisi della dematerializzazione degli scontrini nel processo di digitalizzazione delle missioni | 2024 | INFN-24-13-DSI.pdf | Guido Guizzunti et al. | Il sistema digitale missioni è lo strumento utilizzato dal personale INFN per la gestione delle trasferte ed è costituito principalmente da due componenti: un Portale Web (frontend) sviluppato in PHP, che consente agli utenti (trasfertisti) di inserire richieste di autorizzazione e rimborso, e un Gestionale Missioni (backend) basato su Oracle EBS, dove gli uffici missione gestiscono le pratiche e generano le relative scritture sul Sistema Contabile (anch’esso Oracle EBS). Il sistema digitale missioni si integra con altri strumenti utilizzati dall'INFN, tra cui GODIVA, che fornisce informazioni anagrafiche e di organigramma a Oracle EBS, e i gestionali Presenze e Stipendiale, che acquisiscono dati dal Gestionale Missioni (backend). Entrambe le componenti di frontend e backend del sistema digitale missioni sono sviluppate con tecnologie ormai obsolete e non più aggiornabili, richiedendo quindi un rifacimento urgente basato su tecnologie moderne. L’obiettivo è ottimizzare i processi, migliorare la manutenzione, aumentare l’efficienza operativa e offrire agli utenti un’esperienza più intuitiva. Data la complessità del progetto, il nuovo sistema digitale missioni sarà sviluppato in più fasi, per garantire una transizione graduale e minimizzare l’impatto sugli utenti. Questo documento ha l’obiettivo di condividere con il management la visione del nuovo sistema digitale missioni delineata dalla Direzione Sistemi Informativi (DSI), con particolare attenzione alla dematerializzazione dei documenti di spesa. In quest’ambito, viene presentata un’analisi funzionale dei processi, condivisa con gli Esperti di Dominio delle missioni, con l’Ufficio Transizione Digitale e Protocollo e con il Responsabile per la Transizione Digitale (RTD), che evidenzia aspetti chiave e criticità. Il documento mira a fornire alla Dirigenza un quadro iniziale completo, utile per le decisioni e le azioni di coordinamento necessarie. |
| 5988 | 2024-11-18 | ELETTRONICA DI LETTURA PER RIVELATORI A SEMICONDUTTORE | 2024 | INFN-24-12-PD.pdf | Rubens Raffagnato | I moderni ASIC di readout implementano circuiti frutto di evoluzioni di topologie di amplificazione e formatura. La progettazione presta particolare attenzione al rumore elettronico e le scelte progettuali sono volte a mitigare il suo effetto allo scopo di rendere lo stadio di acquisizione più performante e affidabile possibile. Questo lavoro ha l’intento di studiare ed analizzare in maniera approfondita e dettagliata il funzionamento di un circuito amplificatore di carica e discutere gli aspetti tecnici. Verranno trattati i concetti generali legati alla rilevazione di particella e verrà affrontata l’architettura e la topologia circuitale, concetti fondamentali per le odierne e le future applicazioni di ricerca scientifica. |
| 5987 | 2024-11-04 | Ansatz about a zero momentum mode in QCD and the forward slope in pp elastic scattering | 2024 | INFN-24-11-LNF.pdf | G. Pancheri, Y. N. Srivastava, O. Shekhovtsova | We recall a resummation procedure in QED to extract the zero momentum mode in soft photon emission and present an ansatz about a possible mechanism for the forward peak characterizing elastic proton proton scattering |
| 5986 | 2024-10-28 | Datawarehouse della Direzione Sistemi Informativi INFN : Aggiornamenti alla Struttura dell’ETL | 2024 | INFN-24-10-DSI.pdf | Thomas Angelini, Claudio Galli | L’ETL (Extract, Transform, Load) è il processo che, in notturna, si occupa di aggiornare la banca dati del Data Warehouse INFN al fine di esporre agli utenti dati consistenti e certificati tramite strumenti di Business Intelligence (BI). Essendo un processo complesso e articolato, la sua esecuzione tramite un tool dedicato richiede molto tempo, eppure è fondamentale per la certificazione dei dati da rendere fruibili tramite report e dashboard. Uno degli obiettivi dell’Ufficio Data Warehouse e Business Intelligence della Direzione Sistemi Informativi (DSI) è quello mantenere ed evolvere questo processo, migliorarne le performance ed occuparsi della correttezza, completezza e consistenza del contenuto informativo della banca dati. Questa nota tecnica si concentra sull’evoluzione dell'architettura di ETL |
| 5985 | 2024-10-15 | Gestione e operatività dei database per le nuove applicazioni della Direzione Sistemi Informativi | 2024 | INFN-24-09-DSI.pdf | Stefano Bovina Guido Guizzunti Giuseppe Misurelli | La modernizzazione dei database, necessaria all’evoluzione di alcuni applicativi verso l’architettura a microservizi, è stata un momento di svolta per il servizio Database dell'Ufficio Sviluppo e Gestione Strategica dell’Infrastruttura. Una svolta tecnologica, organizzativa e di sostenibilità economica basata sulla possibilità di esplorare soluzioni Open Source con cui superare alcuni limiti del modello commerciale, come ad esempio l'indipendenza da una soluzione Oracle, e allo stesso tempo validare l’inclusione nella piattaforma, alla base di sviluppo e gestione dell’Infrastruttura della Direzione Sistemi Informativi (con i suoi servizi e le buone pratiche), di un ulteriore tassello con cui gestire i dati strutturati e non strutturati generati all’interno dell’ecosistema degli applicativi. In questa nota interna viene descritto, evidenziandone architettura e operatività, come le due tecnologie di database pensate rispettivamente per gestire dati di tipo SQL e NoSQL siano state introdotte all’interno della piattaforma e integrate nel contesto di efficienza operativa della piattaforma stessa. |
| 5984 | 2024-09-09 | Conceptual electromagnetic design of the detector magnet for the ALICE 3 upgrade | 2024 | INFN-24-08GE.pdf | Alessio Dellacasagrande, Andrea Bersani, Stefania Farinon, Filippo Levi, Riccardo Musenich | Canted cosine theta (CCT) windings are often chosen for the fabrication of acceler-ator magnets. This innovative winding technique can also be adapted for use in detector magnets, introducing a dipole component to the magnetic field alongside the conventional solenoid field. By incorporating this dipole component, the momentum resolution at low emission angles is significantly enhanced, offering improved performance and accuracy in particle detection. |
| 5983 | 2024-07-03 | Characterization of Cu plates and films implanted with Ag ions | 2024 | INFN-24-07-LNF.pdf | C. Balasubramanian, K. Asokan, B. Spataro, J. Rezvani, and A. Marcelli | In this study, we present the characterization of 100 MeV Ag ions implanted on thick copper plates (5 mm) and of 70 keV Ag ions implanted on thin copper films (~300 nm) deposited on Si and Sapphire substrates. Ion implantations were carried out at the Inter University Accelerator Centre (IUAC) in New Delhi. After the implantation of silver ions, characterizations of the surface morphology and the chemical composition were performed on both pristine and implanted samples. The Rutherford backscattering spectrometry probed the thickness of the films showing the presence of implanted Ag ions in the Cu thin films. Raman spectra confirmed the depth of ion implantations. |
| 5982 | 2024-06-19 | Linee guida per la produzione di documenti accessibili | 2024 | INFN-24-06-DSI.pdf | G. Perillo | I documenti accessibili sono tali quando consentono di accedere alle informazioni necessarie a tutti, inclusi coloro che hanno disabilità visive, cognitive o motorie, anche se dovessero utilizzare tecnologie assistive o configurazioni particolari. Questo documento descrive l'importanza per le pubbliche amministrazioni di produrre documenti accessibili e fornisce informazioni tecniche e pratiche sull'utilizzo di alcuni strumenti software dedicati alla creazione dei documenti per perseguire questo scopo. In particolare, viene descritto il ciclo di produzione completamente digitale di un documento, dall'utilizzo dell'editor di testo fino alla corretta conversione in formato pdf che mantenga tutti i criteri di accessibilità. DOI n. 10.15161/oar.it/211555 |
| 5981 | 2024-05-21 | Raoul Gatto and Bruno Touschek's joint legacy in the rise of electron-positron physics | 2024 | INFN-24-05-LNF.pdf | Luisa Bonolis, Franco Buccella, Giulia Pancheri | Raoul Gatto and Bruno Touschek's collaboration in the establishment of electronpositron colliders as a fundamental discovery tool in particle physics will be illustrated. In particular, we will tell the little-known story of how Gatto and Touschek's pioneering visions combined to provide the theoretical foundation for AdA, the first matter-antimatter collider, and how their friendship with Wolfgang Pauli and Gerhard Lüders was crucial to their understanding of the CPT theorem, the basis for AdA's success. We will see how these two exceptional scientists shaped physics between Rome and Frascati, from the proposal to build AdA and soon after the larger machine ADONE in 1961, to the discovery of the 𝐽/Ψ particle in 1974. We will also highlight Gatto and Touschek's contribution in mentoring an extraordinary cohort of students and collaborators whose work contributed to the renaissance of Italian theoretical physics after the Second World War and to the establishment of the Standard Model of particle physics. |
| 5980 | 2024-05-20 | TRACCIATORE A PIXEL DI SILICIO DEL PRECISION PROTON SPECTROMETER DI CMS: SVILUPPO DELLA NUOVA MECCANICA CON MOVIMENTAZIONE INTERNA, PROCEDURE DI ASSEMBLAGGIO E TEST | 2024 | INFN-24-04-GE.pdf | Adriano Bevilacqua, Stefano Cerchi, Antonello Mercenaro, Rosanna Puppo, Enrico Robutti, Cecilia Rossi, Andrea Trovato | Il presente lavoro descrive l’evoluzione del supporto meccanico e del sistema di movimentazione interna del tracciatore del Precision Proton Spectrometer (PPS) dell’esperimento CMS. Scopo di questo upgrade è quello di rendere più agevoli e meno rischiose le procedure di assemblaggio e installazione, e di migliorare le prestazioni del sistema di movimentazione interna. Vengono inoltre descritte le procedure di test utilizzate per l’installazione e la movimentazione, nonché quella per la misura di posizione dei sensori. |
| 5979 | 2024-04-03 | Accessibilità delle Web APP della DSI | 2024 | INFN-24-03-DSI.pdf | Marzio D’Alessandro, Claudio Ciamei | Rendere un’applicazione web accessibile, oltre ad essere un dovere sociale, permette ad ogni utente di poter usufruire delle sue funzionalità in un modo più profittevole. Gli aspetti caratterizzanti l’accessibilità si dividono in due categorie principali: visibili e invisibili. I primi sono degli aspetti di cui l’utente ha un’esperienza diretta e sono ad esempio i colori utilizzati e il modo in cui sono realizzati gli elementi interattivi della pagina. I secondi, invece, corrispondono al modo in cui le pagine web sono codificate e possono essere analizzate da un lettore automatico. In questa trattazione saranno discusse entrambe le tipologie di aspetti e il focus sarà puntato sulla loro gestione nell’ambito dello sviluppo interno alla DSI, che ha tra i propri obiettivi la realizzazione di applicativi web a supporto delle attività amministrative dell’INFN. |
| 5978 | 2024-03-26 | EuroSIG FRAMEWORK - CONCEPTUAL DESIGN REPORT OF THE SUPERCONDUCTING ION GANTRY (SIG) DIPOLE DEMONSTRATOR MAGNET | 2024 | INFN-24-02-MI.pdf | Marco Prioli, Emma Bianchi, Anna Giulia Carloni, Roberto Cereseto, Stefania Farinon, Andrea Gagno, Filippo Levi, Samuele Mariotto, Alessandra Pampaloni, Lucio Rossi, Carlo Santini, Riccardo Umberto Valente, Enrico Felcini5, Guglielmo Frisella, Alessio Mereghetti, Simone Savazzi, Marco Pullia, Elisavet Oursoula Kavoura, Ioannis Georgiadis, Charilaos Kokkinos | This Conceptual Design Report (CDR) concerns the demonstrator of a curved dipole demonstrator magnet for an innovative superconducting gantry for ion therapy. The demonstrator will be realized in the framework of both the INFN (the Italian National Institute for Nuclear Physics) grant SIG (Superconducting Ion Gantry) and of the international collaboration EuroSIG among INFN, CNAO, CERN, and MedAustron. SIG and EuroSIG aim to demonstrate enabling technologies for nextgeneration ion gantries and they overlap in several developments while at the same time pursuing some solutions independently. After a brief overview of the gantry optical layout and requirements, the report illustrates the adopted conductor, the electromagnetic design of the demonstrator with the relative guiding principles, its thermal design and quench behavior and its structural design. For the structural design, a sensitivity analysis is conducted taking into account the possible tolerances, uncertainties in the material properties, and also and different materials. An alternative winding technique is developed as a backup solution and it applies to a coil block magnet design. PACS:xxx |
| 5970 | 2024-03-05 | Booking: un software per la prenotazione delle risorse dell’ente | 2024 | INFN-24-01-LNF.pdf | Giovanni Lorenzo Napoleoni, Claudio Bisegni, Michele Tota, Ramon Orrù, Foggetta Gennaro Luca | Progettazione e sviluppo di un software per la prenotazione delle risorse dell’ente che richiedono un workflow approvativo (semplice o complesso) come la prenotazione di facility per esperimenti e aule per conferenze. Lo scopo del software consiste nell’informatizzare tutti i processi di business(1) applicati alla prenotazione di una determinata risorsa e nell’eliminazione dei processi cartacei non tracciati, garantendo i principi di autenticazione e autorizzazione in base ai ruoli che l’INFN assegna ai singoli utenti. Attraverso la definizione del workflow è possibile configurare, oltre al normale flusso procedurale, timer, sotto workflow, invio di email scadenzate e attivare procedure custom come l’invio di comandi ad apparecchiature elettroniche. Il core del progetto è basato sull’utilizzo della notazione BPMN per descrivere i workflow legati alle prenotazioni delle risorse e all’implementazione di un orchestratore per gestirne il ciclo di vita. A differenza di altri strumenti, la notazione BPMN permette di definire un workflow senza la scrittura di codice con un linguaggio di programmazione ma con una definizione grafica che facilita la gestione di tutto il processo di prenotazione. E’ stata anche sviluppata un’applicazione web che attraverso una GUI guida l’utente e gli amministratori nel processo di creazione e prenotazione delle risorse. Al momento il software è in uso per la prenotazione della Beam Test Facility dei LNF e della Labec Facility della sezione di Firenze |
| 5969 | 2023-12-22 | Heavy-ion test report of LTC1668 DAC LiteBIRD-NOTE-84 | 2023 | INFN-23-32-MIB.pdf | A. Cotta Ramusino, S. Della Torre, L. Galli, A. Limonta, R. Malaguti, D. Nicolò, G. Signorelli, L. Silvestrin, F. Spinella, A. Tartari, M. Tessaro, J. Wyss and M. Zannoni | This document presents the results of a heavy-ion test program carried out on the Linear Technology LT1668 16-bit 50 Msps DAC (LTC1668IG) to identify single-event effects. In particular, it was studied the detection of single-event latch-up (SEL), single-event upsets (SEU), and single-event transients (SET) due to heavy-ions radiation. The tests were performed at the heavy-ion facility Tandem-ALPI at INFN Legnaro National Laboratory (Italy) in February 2021 and June 2022 for a total irradiation time of ∼51 hours |
| 5968 | 2023-11-13 | Piattaforma 3DExperience: procedura operativa per la gestione del ciclo di vita di un prodotto e della documentazione di progetto | 2023 | INFN-23-31-LNGS.pdf | Daniele Cortis, Alessandro Lalli | Il presente documento descrive la procedura operativa per la gestione del ciclo di vita di un prodotto e della documentazione di progetto, implementato dal “Reparto di Progettazione” del Servizio di Meccanica dei Laboratori Nazionali del Gran Sasso (LNGS) dell’INFN (Istituto Nazionale di Fisica Nucleare), attraverso la piattaforma di Project Life-Cycle Management della Dassault System “3DExperience” [1]. Il documento descrive altresì l’integrazione della piattaforma con gli altri sistemi informativi messi a disposizione dall’INFN ai suoi dipendenti ed associati. |
| 5967 | 2023-11-02 | Magnetic field, Lorentz forces and stored energy of multipole cos(nθ) and sector magnets with and without iron yoke | 2023 | INFN-23-30-GE.pdf | Stefania Farinon and Daniel Novelli | When approaching the design of a multipole magnet, such as a dipole, quadrupole, sex-tupole, and so on, it is highly advantageous to initiate the process by establishing the fundamental parameters. These parameters include conductor size, current density, inner and outer radius of the iron yoke, and more. This preliminary dimensioning enables the acquisition of the necessary specifications for the design. Within this report, analytical expressions for the magnetic field, Lorentz forces, and stored energy of multipole mag-nets with the cos(nθ) and sector coil configurations, both with and without the presence of an iron yoke, are derived. These derivations are based on the vector potential of a current line. |
| 5965 | 2023-10-31 | Raoul Gatto and Bruno Touschek’s collaboration in the birth of electron-positron physics | 2023 | INFN-23-28-LNF.pdf | Luisa Bonolis, Franco Buccella, Giulia Pancheri | Raoul Gatto’s contributions to the establishment of electron-positron colliders as a fundamental discovery tool in particle physics is illustrated. His collaboration with Bruno Touschek both in the construction of AdA and proposing ADONE is highlighted, through unpublished photographs and original documents. |
| 5966 | 2023-10-31 | Structural analysis of the double-walled copper-steel cryogenic chamber of the ASTAROTH experiment | 2023 | INFN-23-29-LNGS.pdf | Daniele Cortis, Donato Orlandi, Andrea Zani, Davide D’Angelo | This document describes the verification process of structural performance of the doublewalled copper-steel cryogenic chamber of the ASTAROTH (All Sensitive crysTal ARray with lOw THreshold) experiment and the evaluation of the stresses generated near the thermal bridge connecting the inner and outer wall. The chamber consists of an external AISI 316L stainless steel dewar and an inner double-walled OF (Oxygen Free) copper dewar connected to an AISI 316L stainless steel flanged collar. The results showed that close to the thermal bridge (copper-steel junction) the stresses slightly exceed the YS of copper at the estimated operating temperature (localised strain-hardening condition). On the other hand, the safety coefficient respect to fracture is well above one for both materials. This condition, together with the fact that limited cooling cycles are expected during the operating life of the system, leads to the assumption that a progressive material hardening will occur in this area, thus locally raising the YS limit. |
| 5964 | 2023-10-26 | Manufacture of a Mo<sub>3</sub> coated copper made device | 2023 | INFN-23-27-LNF.pdf | S. Macis, A. D’ Elia, L. Mosesso, J.S. Rezvani, B. Spataro, S. Lupi, and A. Marcelli | We describe the procedure to manufacture a model of a cylindrical RF cavity made in copper and coated with a 100 nm thick layer of molybdenum trioxide. The device is 100 mm long, has an internal diameter of 60 mm and an external diameter of 80 mm. The cylindrical device was carefully divided into four sections to make possible the coating on the internal curved surfaces polished to a roughness < 10 nm. The molybdenum trioxide has been deposed utilizing a thermal evaporation technique with a dedicated high vacuum chamber equipped with a high-temperature Alumina crucible working in the temperature range of 400<sup><sup>°</sup> - 600<sup><sup>°</sup> C. |
| 5963 | 2023-09-06 | La piattaforma alla base di sviluppo e gestione dell’Infrastruttura della Direzione Servizi Informativi | 2023 | INFN-23-25-DSI.pdf | Stefano Bovina, Guido Guizzunti, Giuseppe Misurelli | Garantire la continuità di servizio dei sistemi gestionali usati dagli utenti dell’Istituto e favorirne l’evoluzione tecnologica sono due delle principali sfide a cui l'Ufficio Sviluppo e Gestione Strategica dell’Infrastruttura risponde. In questo lavoro viene descritta la piattaforma, creata dall’Ufficio nel corso del tempo, con cui continuità di servizio ed evoluzione tecnologica vengono soddisfatte grazie all’unione fra l’Infrastruttura di Virtualizzazione utilizzata, una serie di Servizi messi a disposizione (es. Monitoraggio e Allarmistica, CICD) e delle Metodologie (es. Efficienza Operativa, Approccio DevOps) che regolano le attività e l’interazione con la piattaforma stessa. Una piattaforma tecnologica, organizzativa e culturale che nel tempo ha fatto emergere un ecosistema in grado di alimentare processi capaci da una parte di operare infrastruttura e servizi in maniera efficiente, dall’altra di promuovere flessibilità ed elasticità nell’evoluzione dei sistemi gestionali informatici usati nell’Istituto. DOI n. 10.15161/oar.it/77193 |
| 5962 | 2023-06-30 | Assessment of hadronic reactions in GEANT4 and FLUKA for the POKER experiment | 2023 | INFN-23-24-GE.pdf | Pietro Bisio, Mariangela Bondì, Andrea Celentano, Anna Marini, Luca Marsicano | The goal of the POKER ERC project is to establish and demonstrate a new approach to the search for light-dark matter, based on a missing energy measurement with a positron-beam, active thick-target setup. In the experiment, a high-energy e<SUP>+</SUP> beam impinges on a high-performance hermetic calorimeter, that measures the deposited energy event by event. Light dark matter particles could be produced by the annihilation of the positron with atomic electrons, and would then escape from the detector without further interactions. One of the most critical background reactions for the measurement involve one or more high-energy hadrons produced by the developing electromagnetic shower and escaping from the calorimeter, thus resulting in a sizeable missing energy. A Monte Carlo estimate of this background yield is required in order to properly design the experimental apparatus. In order to validate the simulation results, we compared the predictions from the FLUKA and GEANT4 Monte Carlo programs with available data for a few hadronic reactions involving long-lived neutral hadrons or particles emitted at backward angles. Our results show that, in general, the agreement between the Monte Carlo predictions and the real data is good, with FLUKA results closer to the experimental measurements, in particular concerning the shape of the cross section. PACS:13.40.- |
| 5948 | 2023-06-07 | GESTIONE DEI RIFIUTI ALL’INTERNO DELLA SEZIONE INFN DI FIRENZE | 2023 | INFN-23-20-FI.pdf | Carlo Cialdai, Riccardo Ciucchi, Paolo Gentili | La presente nota interna ha l’obiettivo di fornire uno strumento di riferimento e di consultazione per il personale INFN della Sezione di Firenze che è coinvolto direttamente nella produzione, gestione e smaltimento dei rifiuti. |
| 5949 | 2023-06-07 | Il sistema gestionale dei progetti di ricerca INFN | 2023 | INFN-23-21-DSI.pdf | Antonello Paoletti, Marzio D'Alessandro, Roberto Gomezel, Emanuele Turella, Francesco Serafini | In questo lavoro è descritto un ecosistema applicativo per la gestione dei progetti di ricerca in ambito INFN. Il sistema qui presentato supporta molteplici processi gestionali a partire dal censimento dei progetti, passando dalla fase di allocazione risorse e referaggio, per poi concludersi con attività di monitoraggio e valutazione della produttività scientifica. Saranno descritti i succitati processi gestionali in relazione agli attori e alle specificità dell’Ente e analizzato lo status quo degli applicativi su cui è in corso un’attività di revisione e graduale reingegnerizzazione. |
| 5950 | 2023-06-07 | A time tracking system for EU-funded INFN projects | 2023 | INFN-23-22-DSI.pdf | Antonello Paoletti, Marco Canaparo, Claudio Galli, Francesco Serafini | The aim of this work is to describe the structure of a web application to support EU-funded INFN projects in the process of time tracking and reporting. The system has been designed in the early 2010s, following the growth of the EU-funded projects and the need for a framework to handle consistent reports according to the EU guidelines. One objective of this project is to guarantee and certify a valid distribution of hours declared on EU projects by INFN personnel in consistency with the official INFN clocking system, the scientific project management system and, overall, any signed agreements between the INFN and the founding bodies. The system allows the project participants to declare the hours worked on their projects, detailing their distribution across days, work packages and tasks. Interfaces are provided for Project Managers and Financial Officers to manage a project and monitor its trend. This activity is also supported by the INFN Business Intelligence Service, integrated with this system, to provide comprehensive reports for the upper management. DOI |
| 5947 | 2023-05-26 | LINEE GUIDA PER LA DISTRIBUZIONE E L’UTILIZZO DI GAS COMPRESSI IN LABORATORIO | 2023 | INFN-23-19-FI.pdf | Carlo Cialdai | La presente nota interna costituisce riferimento generale per la distribuzione e l’esercizio di impianti di distribuzione di gas tecnici oltre che per il deposito di bombole di gas compressi all’interno della sede INFN di Firenze. I sistemi di distribuzione considerati sono quelli in cui i gas sono stoccati come gas compressi, gas liquefatti o gas disciolti in un solvente; sono esclusi i liquidi criogenici (es. azoto liquido), la rete dipartimentale dell’aria compressa (alimentata da compressori) e la rete di distribuzione del metano (prelevato da rete esterna). |
| 5946 | 2023-05-15 | Impianto di aria compressa a servizio della camera bianca: schema funzionale e procedura di messa in servizio | 2023 | INFN-23-18-FI.pdf | Carlo Cialdai | La presente nota interna ha l’obiettivo di descrivere l’impianto di aria compressa a servizio della camera bianca collocata nell’edificio di Fisica Sperimentale della Sezione di Firenze dell’INFN e di illustrare la procedura per la sua messa in servizio attraverso il portale CIVA di INAIL. Published |
| 5961 | 2023-05-15 | INFN-CHNET RADIATION DATA STORING AND VISUALIZING SYSTEM FOR THE LABEC TANDEM ACCELERATOR | 2023 | INFN-23-23-FI.pdf | Alessandro Bombini, Caroline Czelusniak, Luca Carraresi, Lorenzo Giuntini, Mirko Massi, Francesco Taccetti | In the INFN section of Firenze, a TANDEM accelerator (3MV TANDETRON by HVE) is installed at the LABEC laboratory. The environmental radiation monitoring is guaran-teed by a set of gamma and neutron dosimeters placed around the accelerator and in the adjacent rooms and by three gamma-neutron dose rate monitors placed inside the acceler-ator hall for real-time measuring. In the context of the INFN-CHNet (INFN network for Cultural Heritage) development activities, we set up a home-made, low-cost system for the remote acquisition, storing and visualization of dose rate measurements from radia-tion monitors. The system was built using Arduino boards which communicate with the three monitors and send data over a internal network. A main PC is used for remote data collection and display, while Raspberry mini-PCs serve as backup devices. The software was designed and implemented in modules for a future service-oriented application on cloud. In this note, a brief description of the system is reported. |
| 5945 | 2023-05-08 | Un motore di Workflow per applicazioni web | 2023 | INFN-23-17-DSI.pdf | Antonello Paoletti, Giancarlo Terilli, Claudio Ciamei, Francesco Serafini1 | Progettazione e sviluppo di un motore di workflow per processi gestionali informatizzati. Il termine workflow identifica il modello digitale di un processo di business<SUP>1</SUP> attraverso la sua rappresentazione in forma di grafo orientato<SUP>2</SUP>. Ogni nodo del grafo identifica un’azione ben definita, declinata in forma di passaggi decisionali, sottoprocessi e/o manipolazione dei dati di contesto, con l’obiettivo di supportare l’iter di un processo in maniera efficiente, misurabile e ripetibile. La definizione di un workflow implica sia aspetti statici che dinamici di un processo e ne modella il comportamento come un automa a stati finiti<SUP>3</SUP>. Ogni collegamento dell’automa stabilisce un collegamento fra due attività, definendo condizioni di percorrenza formalizzate come funzioni booleane. Tali funzioni sono attivate nel momento in cui un attore o un sotto-processo conclude le attività previste dalla fase attuale e vuole transire alla successiva. Emerge, a questo punto, la necessità di un orchestratore che governi l’andamento del workflow, garantisca il rispetto dei vincoli imposti dal processo sottostante e punti alla “fase attuale” del flusso, permettendo di individuare i percorsi attivabili e le condizioni di percorribilità in funzione del contesto e degli attori. |
| 5943 | 2023-05-02 | Assembly of the SM1 Micromegas chambers for the muon spectrometer upgrade of the ATLAS experiment at LHC | 2023 | INFN-23-15-LNF.pdf | Antonelli M., Arcangeletti C., Beretta M., Capitolo E., Cerioni S., Lauciani S., Mancini G., Pileggi G., Ponzio B., Russo V., Tskhadadze E., Vassilieva T. | MicroMegas (MICRO MEsh GAseous Structure) detectors are the new precision tracking detectors installed in the forward muon spectrometer of the ATLAS experiment, composing the New Small Wheel (NSW). The INFN built 32 (+2 spare) MicroMegas chambers for the small sector of the NSW (SM1). The SM1 modules have 2m2 surface area and they are composed of four gaps, each one made of a catodic plane, a metallic micro–mesh and an anodic plane with the readout strips to reconstruct the precision coordinate and the second coordinate stereo. The assembly procedure of the SM1 modules is presented. |
| 5944 | 2023-05-02 | Validation procedure of the SM1 Micromegas chambers for the muon spectrometer upgrade of the ATLAS experiment at LHC | 2023 | INFN-23-16-LNF.pdf | Antonelli M., Arcangeletti C., Beretta M., Capitolo E., Cerioni S., Gauzzi P., Lauciani S., Mancini G., Massarotti P., Pileggi G., Paris M., Ponzio B., Putino F., Russo V., Tskhadadze E., Vassilieva T. | MicroMegas (MICRO MEsh GAseous Structure) detectors are the new precision tracking detectors installed in the forward muon spectrometer of the ATLAS experiment, composing the New Small Wheel (NSW). The INFN built 32 MicroMegas chambers for the small sector of the NSW (SM1). The validation procedure developed at LNF to ensure the geometry requirements, the gas tightness and guarantee good performance in High Voltage of the SM1 modules is presented in this note. |
| 5942 | 2023-04-13 | Feebly-Interacting Particles: FIPs 2022Workshop Report | 2023 | INFN-23-14-LNF.pdf | C. Antelantel, M. Battaglieribattaglieri, J. Beachambeacham,a, C. Boehmboehm, O. Büchmullerbuchmuller, F. Calorecalore, P. Carenzacarenza, B. Chauhanchauhan, P. Cladèclade, P. Colomacoloma, P. Crivellicrivelli, V. Dandoydandoy, L. Darmedarme, B. Deydey, F. F. Deppischdeppisch, A. De Roeckroeck,a, M. Drewesdrewes,a, B. Echenardechenard,a, V. V. Flambaumflambaum, P. Foldenauerfoldenauer, C. Gattigatti, M. Giannottigiannotti,a,∗, A. Golutvingolutvin M. C. Gonzalez-Garciagonzalezg1,gonzalezg2,gonzalezg3, S. Gorigori, E. Goudzovskigoudzovski, A. Granelligranelli, H. Grotegrote, S. Guellati-Khelifaclade,guellati, J. Hajerhajer,a, P. Harrisharris, C. Heartyhearty, M. Hosterthostert, S. Juniusjunius, F. Kahlhoeferkahlhoefer, J. Klaricklaric, F. Klingkling, P. Kloseklose, J. Knolleknolle, J. Koppkopp1,kopp2, O. Kwonkwon, O. Lantwinlantwin, G. Lanfranchilanfranchi,a,∗, L. Lili, A. Lindnerlindner, J. Lopez-Pavonlopezpavon,a, J. Maroccomarocco, J. W. Martinmartin, S. Middletonmiddleton, S. Milsteadmilstead, C. A. J. O’Hareohare, A. Paolonipaoloni, S. Pascolipascoli1,pascoli2,a S. T. Petcovpetcov, M. Pospelovpospelov1,pospelov2, R. Pöttgenpottgen, M. Raggiraggi, G. Ripellinoripellino I. B. Samsonovflambaum, S. Sandnersandner S. Söldner-Remboldsoldner, J. Sheltonshelton, N. Songsong, C. Sunsun, Y. V. Stadnikstadnik,a,∗, N. Tastettastet, N. Torotoro, N. Trantran, N. Trevisanitrevisani, S. Ulmerulmer, S. Urreaurrea, B. VelgheV elghe, B. Wallishwallish1,wallish2, Y. Y. Y. Wongwong, C. Zorbilmezzorbilmez, K. Zurekzurek,.... | Particle physics today faces the challenge of explaining the mystery of dark matter, the origin of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent fine-tuning of the electro-weak scale, and many other aspects of fundamental physics. Perhaps the most striking frontier to emerge in the search for answers involves new physics at mass scales comparable to familiar matter, below the GeV-scale, or even radically below, down to sub-eV scales, and with very feeble interaction strength. New theoretical ideas to address dark matter and other fundamental questions predict such feebly interacting particles (FIPs) at these scales, and indeed, existing data provide numerous hints for such possibility. A vibrant experimental program to discover such physics is under way, guided by a systematic theoretical approach firmly grounded on the underlying principles of the Standard Model. This document represents the report of the FIPs 2022 workshop, held at CERN between the 17 and 21 October 2022 and aims to give an overview of these efforts, their motivations, and the decadal goals that animate the community involved in the search for FIPs. |
| 5935 | 2023-04-07 | Scouting tecnologico e primi test del nuovo servizio di Business Analytics della Direzione Sistemi Informativi INFN | 2023 | INFN-23-13-DSI.pdf | Claudio Galli | Dalla fine del 2021 in poi sempre più utenti hanno espresso la necessità di analizzare i dati provenienti dai sistemi della Direzione Sistemi Informativi (DSI) con maggior autonomia rispetto a quanto non fosse possibile fino a quel momento. Per dare una risposta adeguata a tali richieste è stata avviata una fase di scouting tecnologico coinvolgendo diversi competitor internazionali nel settore Business Analytics. L’obiettivo era identificare quale soluzione potesse meglio rispondere alle nuove esigenze, nel rispetto delle linee guida dell’Agenzia per L’Italia Digitale (AGID)[ 1] per la transizione digitale delle pubbliche amministrazioni (PA). Un requisito fondamentale è stato il grado di integrazione che tali prodotti garantivano. Si è valutato quindi la capacità di connettersi con altre tecnologie impiegate nella direzione, la sostenibilità infrastrutturale (risorse, attivitàa di DevOps ...) e quanto si integrassero con gli strumenti usati abitualmente dalle altre direzioni ed utenti INFN. Dopo una breve introduzione, questo elaborato si concentra sul prodotto scelto, Microsoft Power BI Premium, le funzionalità più importanti che offre in associazione con il Tenant 365 dell’INFN ed il setup del nuovo servizio di Self Service BI. |
| 5936 | 2023-04-06 | EuPRAXIA Advanced Photon Sources PNRR_EuAPS Project | 2023 | INFN-23-12-LNF.pdf | M. Ferrario, R. Assmann, L. Avaldi, P. Bolognesi, R. Catalano, A. Cianchi, P. Cirrone, A. Falone, T. Ferro, L. Gizzi, M. G. Iungo, L. Labate, C. Mustarelli, G. Petringa, A. R. Rossi | The EuPRAXIA Advanced Photon Sources (EuAPS) project, led by INFN in collaboration with CNR and University of Roma 'Tor Vergata', foresees the construction of a laser-driven “betatron” X Ray user facility at the LNF SPARC_LAB laboratory. EuAPS also includes the development of high power (up to 1 PW at LNS) and high repetition rate (up to 100 Hz at CNR Pisa) drive lasers for EuPRAXIA. EuAPS has received a financial support of 22.3 M€ from the PNRR plan, Mission 4 “Education and Research”, Action 3.1.1 “Creation of new research infrastructures strengthening of existing ones and their networking for Scientific Excellence under Horizon Europe” and has received the highest score among the submitted projects of the ESFRI area “Physical Sciences and Engineering”. The EuAPS project starting date has been fixed on December 1<SUB>st</SUB>, 2022 and will last 30 months (with a possible extension of additional 6 months). In this paper we report the introductory part of the submitted proposal. |
| 5934 | 2023-04-05 | Sistema Gestionale dei Prodotti della Ricerca: CDR e WBS di Progetto | 2023 | INFN-23-11-DSI.pdf | Antonello Paoletti, Marzio D’Alessandro, Mauro Gattari, Francesco Serafini, Luca Sanelli | Sviluppo di un sistema gestionale per l’archiviazione di metadati e documenti relativi a prodotti della ricerca INFN. Il sistema qui descritto è parte di un progetto più ampio, coordinato con il gruppo OpenScience e il Gruppo di Lavoro sulla Valutazione dell’INFN mirato allo sviluppo di un CRIS (Current Research Information System) d’Istituto. Il sistema gestionale è progettato per fornire servizi di archiviazione e gestione dei dati relativi a prodotti della ricerca, interoperando con servizi e banche dati interni (GODiVA, Zenodo, GLVsoft) ed esterni (Clarivate, Scopus, DOI) al fine di costruire un repository autoritativo e integrato a supporto di attività gestionali, di archivio, divulgazione, monitoraggio e valutazione. Questo lavoro nasce con il superamento del concetto di “Database delle Pubblicazioni”, inteso come mirror o archivio di metadati e punta, invece, sullo sviluppo di un sistema di “transito” e arricchimento delle informazioni nell’ambito di una rete di “produttori” e “consumatori” di dati sulla produttività scientifica dell’Ente. Tale sistema ha la capacità di acquisire, far coesistere e collegare informazioni provenienti da fonti diverse, al fine di generare un patrimonio informativo complesso attraverso interfacce (UI/API) e meccanismi semi-supervisionati di machine learning. |
| 5932 | 2023-03-28 | PROGRESS ON THE MECHANICAL DESIGN OF FCC e<sup>+</sup>e<sup>−</sup> INTERACTION REGION | 2023 | INFN-23-10-LNF.pdf | Francesco Fransesini, Stefano Lauciani | We present the progress made in terms of the mechanical design of the vacuum chamber, the supporting structures and bellows of the Future Circular Collider e<sup>+</sup>e<sup>−</sup> FCCee. We also present the preliminary assembly procedure for the Interaction Region (IR) components and the preliminary technical solutions proposed for the insertion of all components into the main detector. |
| 5933 | 2023-03-26 | Lettura Codici da Timbratrice nel Sistema di Gestione delle Presenze | 2023 | INFN-23-09-DSI.pdf | Marco Canaparo, Barbara Demin | Questo documento descrive l'attività svolta per permettere al Sistema di Gestione delle Presenze INFN di leggere i codici digitati nel marcatempo. Questa funzionalità non era stata prevista nel Sistema Presenze quando era gestito da un'azienda esterna, e quindi è stata interamente implementata dal personale della Direzione Sistemi Informativi. In sostanza, le specifiche richiedevano che il software leggesse un codice inserito nel marcatempo quando il badge veniva passato e creasse il giustificativo corrispondente nel cartellino, come se fosse stato inserito dalla pagina web. L'attività è stata completata nel 2018 e viene utilizzata da alcune strutture abilitate. |
| 5931 | 2023-03-06 | Business Intelligence INFN: Modello Dati Multidimensionale per Ordini e Acquisti | 2023 | INFN-23-08-SDI.pdf | Thomas Angelini, Barbara Demin, Claudio Galli | L’obiettivo di questo elaborato è documentare le difficoltà incontrate, e le soluzioni tecniche adottate, nella creazione di un modello multidimensionale che consenta l’esplorazione dei dati di Gare e Ordini dell’INFN. Da principio ci si è concentrati sull’analisi delle fonti, tra cui il tool RDA che dal 2020 è fonte autoritativa per le gare sotto la soglia dei 40keuro. In un secondo momento, sono stati presi in esame i dati storici e sopra soglia provenienti direttamente dal sistema contabile. I due modelli sono stati uniformati per ottenere una visione coerente e consistente di tutti i dati in possesso dell’ente. Nel documento vengono utilizzati due diversi formalismi descrittivi: i diagrammi E/R (Entity Relation-ships) [2] e DFM (Dimensional Fact Model)[3] utilizzati, rispettivamente, nella fase di indagine dell’as is e nella progettazione multidimensionale. A seguire viene presentata l’implementazione del modello sul data warehouse della Direzione Sistemi Informativi attraverso i processi di ETL (Extract Transform Load). Infine sono riportate alcune note conclusive e i vantaggi ottenuti. |
| 5926 | 2023-02-28 | TDR CYGNO-04/INITIUM - Technical Design Report | 2023 | INFN-23-06-LNGS.pdf | Fernando Domingues Amaro, Rita Antonietti , Elisabetta Baracchini, Luigi Benussi, Stefano Bianco, Cesidio Capoccia, Michele Caponero, Danilo Santos Cardoso, Gianluca Cavoto, André Cortez, Igor Abritta Costa, Rita Joanna da Cruz Roque, Emiliano Dané, Giorgio Dho, Flaminia Di Giambattista, Emanuele Di Marco, Giovanni Grilli di Cortona, Giulia D’Imperio, Francesco Iacoangeli, Herman Pessoa Lima Júnior, Ernesto Kemp, Guilherme Sebastiao Pinheiro Lopes, Amaro da Silva Lopes Júnior, Giovanni Maccarrone, Rui Daniel Passos Mano, Robert Renz Marcelo Gregorio, David José Gaspar Marques, Giovanni Mazzitelli, Alasdair Gregor McLean, Andrea Messina, Cristina Maria Bernardes Monteiro, Rafael Antunes Nobrega, Igor Fonseca Pains, Emiliano Paoletti, Luciano Passamonti, Fabrizio Petrucci, Stefano Piacentini, Davide Piccolo, Daniele Pierluigi, Davide Pinci, Atul Prajapati, Francesco Renga, Filippo Rosatelli, Alessandro Russo, Joaquim Marques Ferreira dos Santos, Giovanna Saviano, Neil John Curwen Spooner, Roberto Tesauro, Sandro Tomassini and Samuele Torelli | This document identifies and describes the characteristics and technical requirements from the CYGNO-04/INITIUM Experiment related to the installation at Hall F of the Gran Sasso National Laboratories (LNGS) |
| 5930 | 2023-02-28 | IMPLEMENTAZIONE DEL LAVORO AGILE NEL SISTEMA DI GESTIONE DELLE PRESENZE | 2023 | INFN-23-02-SDI.pdf | Marco Canaparo, Barbara Demin | L’obiettivo di questo documento `e descrivere il lavoro che `e stato fatto per dotare il sistema di Gestione delle Presenze del giustificativo “Lavoro Agile”. Il lavoro `e iniziato con l’analisi delle specifiche a met`a novembre 2019 e una prima installazione del giustificativo `e stata effettuata il 16/03/2020 in forma sperimentale e solo per un gruppo ristretto di strutture. L’estensione a tutte le strutture INFN `e avvenuta il 15/05/2020. Da questa data in poi si sono succedute diverse installazioni per modifiche dei requisiti, introduzione di migliorie o soluzioni di bug. L’ultima installazione relativa a questo giustificativo `e avvenuta il 24/03/2021. L’inserimento del “Lavoro Agile” nel sistema di Gestione delle Presenze ha assunto carattere di urgenza con lo scoppio della pandemia nel marzo 2020. |
| 5925 | 2023-02-24 | Ripresa dati dal nuovo sistema stipendiale Zucchetti verso l’Identity Management della Direzione Sistemi Informativi | 2023 | INFN-23-05-DSI.pdf | Francesco Serafini, Luca Sanelli | L’obiettivo di questo documento è descrivere il lavoro effettuato per consentire il passaggio dei dati dei dipendenti tra GODiVA e il nuovo sistema stipendiale Zucchetti. È stato necessario produrre diversi script di sincronizzazione per acquisire tutte le variazioni eseguite sul software Zucchetti, in modo da avere le informazioni aggiornate sul sistema di Identity Management GODiVA della Direzione Sistemi Informativi. |
| 5924 | 2023-02-23 | Business Intelligence INFN: introduzione ai Nuovi Report di Bilancio INFN. | 2023 | INFN-23-04-DSI.pdf | Claudio Galli | L’obiettivo di questo elaborato é descrivere le scelte progettuali che hanno portato nel 2020 alla ristrutturazione della reportistica dedicata al Bilancio INFN presente sull’impianto di Business Intelligence (BI) INFN. Nello specifico vengono presentate le motivazioni della dismissione dei vecchi report multidimensionali basati su Viste OLAP [2] in favore degli attuali report JRXML [3]. Vengono anche presentati alcuni aspetti peculiari delle soluzioni implementate sul data warehouse che offre funzionalità di backend per l’impianto volte a garantire il giusto layer autorizzativo nell’accesso ai dati ed alle risorse [4]. DOI n. 10.15161/oar.it/76951 |
| 5923 | 2023-02-20 | IL PORTALE WEB DEGLI ACQUISTI INFN | 2023 | INFN-23-03-DSI.pdf | A. Paoletti, C. Ciamei, A. Moni, E. Turella, F. Serafini, L. Sanelli, M. D’Alessandro, M. Gattari, G. Terilli | L’oggetto di questo lavoro consiste nella descrizione delle applicazioni e dei servizi web progettati per il nuovo portale degli acquisti INFN. Sono descritti aspetti architetturali, metodologici ed organizzativi relativi al sistema nel suo insieme, rimandando a futuri lavori gli approfondimenti sulle singole componenti applicative. |
| 5922 | 2023-01-19 | MODIFICHE AL SISTEMA DI GESTIONE DELLE PRESENZE INFN PER LA COMUNICAZIONE CON IL NUOVO SISTEMA STIPENDIALE | 2023 | INFN-23-01-DSI.pdf | Canaparo M. | L’obiettivo di questo documento `e descrivere il lavoro che `e stato fatto per adattare il software del sistema di gestione delle presenze INFN al fine di consentire il passaggio automatico di dati al nuovo sistema stipendiale Zucchetti. Il sistema di gestione delle presenze INFN non era dotato di funzioni e strutture dati atte alla trasmissione automatica dei propri dati ad un sistema stipendiale, per questo `e stato necessario in pochissimi mesi implementare tutto il necessario in modo tale da partire il prima possibile con la fase di test. |
| 5921 | 2023-01-18 | My collaboration with Edoardo Amaldi and its impact on Gravitational Waves | 2023 | INFN-23-07-LNF.pdf | G. Pizzella | During one of our daily coffees, Edoardo Amaldi told me I was the researcher with whom he had collaborated the longest. This compels me to describe how our collaboration developed from the beginning and what fruits it brought in the search for gravitational waves. I remember, among the myriad events that occurred during the more than a thousand days spent collaborating with Edoardo, some events that most struck me. |
| 5920 | 2022-11-16 | High electric field induced damage using a pulsed THz source: a new technique to test metallic surfaces | 2022 | INFN-22-05-LNF.pdf | S. Macis, A. D’ Elia, A. Irizawa, M.Carillo, B. Spataro, Z. Ebrahimpour, L. Mosesso, J.S. Rezvani, S. Lupi1, and A. Marcelli | We used the ISIR Free Electron Laser (FEL) of the Osaka university to irradiate with THz pulses the surface of a Cu thick sample and MoO<sub>3</sub> films with different thicknesses deposited on Cu. The linearly polarized, intense and coherent THz radiation pulses induced extensive and visible damages as a function of the irradiation angle. This approach allowed to define a protocol of irradiation in order to study the damage as a function of the beam intensity, the number of shots,the angle of incidence and the polarization of the radiation. This irradiation procedure applies to the sample surface under study an electric field gradient that may reach values as high as few GV/m. This original approach makes possible to test in a reproducible way films or the surface of a bulk material to a high electric field gradient on a well-defined region of the surface. *now at SR Center, Res |
| 5919 | 2022-07-14 | Analisi termica e meccanica con il metodo degli elementi finiti del Dewar criogenico dell’esperimento ASTAROTH mediante ANSYS software | 2022 | INFN-22-04-MI.pdf | M. Monti, S. Coelli | In questo report sono raccolti i risultati ingegneristici dell’Analisi ad Elementi Finiti (FEA) della camera centrale dell’apparato sperimentale ASTAROTH (All Sensitive crysTal ARray with lOw THreshold), un rivelatore basato su un concetto innovativo per la ricerca diretta di Dark Matter, con cristalli scintillatori di NaI(Tl). ASTAROTH ha un design basato su cristalli cubici con lettura su tutte le facce, mediante matrici di SiPM (Silicon Photo-multiplier), operante a temperatura criogenica e con materiali a bassissima radio-attività per ridurre il rumore di fondo. |
| 5917 | 2022-06-08 | Beamstrahlung radiation at FCC-ee | 2022 | INFN-22-03-LNF.pdf | A. Ciarma | Beamstrahlung is a dominant effect in high luminosity next-generation lepton colliders. The characterisation of the beamstrahlung radiation produced at the four working points of FCC-ee is presented, together with the tracking of these photons in the MDI region. As the emitted power results to be Ο (100kW ), the design of a dedicated extraction line is necessary in order to avoid energy deposition and secondary production on the beam pipe material |
| 5918 | 2022-05-25 | Radiation damping in a 100 TeV Muon Collider based on the FCC-hh lattice | 2022 | INFN-22-04-LNF.pdf | A. Ciarma | Muon based facilities are raising interest in the high energy physics as they offer unique potential in particular for the next generation of leptonic colliders in the multi-TeV regime. In this note the possibility of using the FCC-hh tunnel to house a 100 TeV muon collider is explored, in order to have a first estimate of the radiation damping on the stored beam |
| 5914 | 2022-01-31 | INSTALLAZIONE, CONFIGURAZIONE E MANUTENZIONE DI UN SERVER PER SCANSIONI DI VULNERABILITA' NON INVASIVE | 2022 | INFN-22-02-CCR.pdf | Leandro Lanzi | L’obiettivo di questa guida   fornire un supporto da un punto di vista sistemistico per l’installazione, la corretta configurazione e la manutenzione di uno o piu` server per effettuare scansioni di vulnerabilit  non invasive tramite il framework open source Greenbone Vulnerability Manager. Published |
| 5915 | 2022-01-31 | TECHNICAL DESIGN REPORT OF THE FalconD Nb<sub>3</sub>Sn COS-THETA DIPOLE MODEL FOR THE FCC-hh AT CERN | 2022 | INFN-22-01-GE.pdf | Sergio Burioli, Barbara Caiffi, Ernesto De Matteis, Pasquale Fabbricatore, Stefania Farinon, Friedrich Lackner, Filippo Levi, Samuele Mariotto, Riccardo Musenich, Alessandra Pampaloni, Marco Prioli, Massimo Sorbi, Marco Statera, Davide Tommasini, Riccardo Umberto Valente | Within the European Project EuroCirCol, INFN developed the design of a twin aperture 16 T 4-layer Nb<sub>3</sub>Sn cos-theta dipole for the Future Circular Collider, which was finally chosen as the baseline for the Conceptual Design Report (CDR). In this framework, the Genoa and Milan groups of INFN, in collaboration with CERN under the Addendum No. KE4102/FCC to FCC Memorandum of Understanding FCC-GOV-0004/17.10.2014, are developing a short model which targets a bore field of 12 T, with the possibility of reaching an ultimate field of 14 T, named Falcon Dipole (Future Accelerator post-Lhc Cosθ Optimized Nb<sub>3</sub>Sn Dipole). As peculiar aspect of the program, already foreseen by the INFN - CERN agreement, the construction of the magnet involves from the beginning industrial partners. INFN has selected ASG Superconductors for this contract, which is now responsible for the construction of the coils. The integration of the magnet in the mechanical structure with the “bladders and keys” technique instead will be carried out at the LASA laboratory in Milan, where a functional test at 4.5 K and 12 T will also be performed. This document, which is the first deliverable of the INFN/CERN collaboration, outlines the main features of the magnet, showing in details the electromagnetic and mechanical design and the quench protection analysis |
| 5916 | 2021-09-30 | Report: Fundamental Physics at Frascati(*) Fabio Bossi, Paola Gianotti, Enrico Nardi Editors INFN, Laboratori Nazionali di Frascati, C.P. 13, I-00044 Frascati, Italy | 2021 | INFN-21-04-LNF.pdf | F. Bossi, P. Gianotti, E. Nardi | Anstract This report summarizes the scientific discussion of the workshop 'Fisica Fondamentale a Frascati' that was held on January the 13th, 2021. The aim of the meeting was to brainstorm on the opportunities to continue to carry out at the LNF experimental activities that could contribute to the scientific exploration of fundamental open questions in particle physics. This initiative has been triggered by the awareness that while the ongoing DA NE scientific program is coming to an end, the EuPRAXIA project, identified as the major future activity of the LNF, has a time horizon of several years before entering the operation phase. Therefore, we asked ourselves to which fields in fundamental physics the LNF can give a sound contribution within the medium-term by exploiting the existing infrastructures or, in case some breakthrough for some specific research is foreseeable, by implementing minor upgrades. The topics that have been identified are: (i) the quest for dark matter candidates in terms of feebly interacting light particles; (ii) probing the axion solution to the strong CP puzzle by searching for dark matter axions with superconducting cavities and with large volume haloscopes; (iii) the study of the low energy QCD problems related to the role of strangeness in nuclear matter. Theoreticians and experimentalists convened to scrutinize the different aspects of these scientific issues. The format chosen for the workshop foresaw a theory talk introducing each subject, followed by experimental contributions describing in detail how the scientific goal can be best addressed. This document resumes the various contributions in a condensed form, and is intended to provide a guideline for who will be asked to evaluate this program. Additional material can be found at the webpage of the meeting (https://agenda.infn.it/event/25299/). |
| 5913 | 2021-09-23 | Crystal slow extraction of positrons from DAΦNE: the SHERPA project | 2021 | INFN-21-03-LNF.pdf | M.Garattini, D. Annucci, O. R. Blanco-Garc�ıa, P. Gianotti, S. Guiducci, A.Liedl, M. Raggi, P. Valente | The SHERPA project aim is to develop an efficient technique to extract a positron beam from one of the accelerator rings composing the DAΦNE complex at the Frascati Na-tional Laboratory of INFN, setting up a new beam line able to deliver positron spills of O(ms) length, excellent beam energy spread and emittance. The most common approach to slowly extract from a ring is to increase betatron oscillations approaching a tune reso-nance in order to gradually eject particles from the circulating beam. SHERPA proposes a paradigm change using coherent processes in bent crystals to kick out positrons from the ring, a cheaper and less complex alternative. A description of this innovative non-resonant extraction technique is reported in this manuscript, including its performance preliminary estimation. |
| 5912 | 2021-05-26 | Crilin: CRystal calorImeter with Longitudinal InformatioN for a future Muon Collider | 2021 | INFN-21-02-LNF.pdf | E. Diociaiuti, D. Paesani, A. Saputi, I. Sarra, D. Tagnani | Being modern tracking systems very precise, jet performance in particle flow-like reconstruction algorithms is usually limited by the calorimeter performance. In particular, a high granularity is required in order to distinguish signal particles from background and to solve the substructures necessary for jet identification. Time of arrival measurements in the calorimeter could play an important role in HL-LHC, since a high number of pile-up collisions is expected, and the timing could be used to assign clusters to the corresponding interaction vertex. In a Muon Collider, the timing could be used to remove signals produced by beam-induced background, asynchronous with respect to the bunch crossing. The calorimeter energy resolution is also fundamental to measure the kinematic properties of jets: a finely segmented calorimeter design should be favored in order to solve the jet substructure. However, this contrasts with the requirement for high timing resolution even for signal events involving low energy deposits, such as in the case of high impulse muons. Our proposed design, the Crilin calorimeter, is a semi-homogeneous calorimeter based on Lead Fluoride (PbF2 ) Crystals readout by surface-mount UV-extended Silicon Photomultipliers (SiPMs). In this paper, the development of a small prototype consisting of 2 layers of 3 3 crystals each is reported along with the relative results. Published by Laboratori Nazionali |
| 5911 | 2021-05-04 | PROPOSAL FOR THE REUSE OF THE ELI-NP GBS PRE INJECTOR FOR A RADIOACTIVE BEAMS FACILITY | 2021 | INFN-21-01-LNF.pdf | A. Variola, D. Alesini, K. Cassou, K. Dupraz, F. Falcoz,A. Falone,A. Giribono, A. Martens, S. Pioli, J. Scifo, C. Vaccarezza, F. Zomer | In the framework of the ELI-NP GBS program a full pre-injector was delivered in the Magurele premises (Romania). This article develops the scenario of the re-use of the pre injector components to integrate a radioactive beams facility in the ELI site, considering the possible interest of the local nuclear physics community. |
| 5729 | 2020-11-24 | EVALUATION OF THE SHIEDLING IN THE BUNKER FOR THE SUPERCONDUCTING CAVITY TEST AT LASA | 2020 | INFN-20-18-MI.pdf | M. Bertucci, F. Broggi, P. Michelato | In the LASA (Laboratorio Acceleratori e Superconduttività Applicata) laboratory of the Milan section of INFN (Istituto Nazionale di Fisica Nucleare) a facility for testing superconducting cavities is operating. The possibility to operate with a generation of radiation up to 10 MeV and more requires a careful evaluation of the shielding efficiency of the existing bunker The calculation was performed with the FLUKA code, the whole cryostat, bunker and ceiling of the building was taken into account. Two hypothesis for the radiation source have been adopted to carry out the calculations: the very conservative hypothesis of 10 MeV electron pencil beam, and the second hypothesis (maybe more realistic) of an isotropic 10 MeV electron source. In the less conservative hypothesis a safe operation is guarantee by the foreseen shielding. The simulations show that even in the most conservative hypothesis a negligible amount of photons can exit the bunker, without interaction with the simulated detectors. In the future, at the starting of the tests in the upgraded configuration, direct measurements will be used to definitely check the shielding adopted. |
| 5627 | 2020-11-12 | About soft photon resummation | 2020 | INFN-20-17-LNF.pdf | G. Pancheri and Y. N. Srivastava | The first time one of us (G.P.) encountered Earle was in Summer 1966, when she was di- rected to study Earle’s papers on radiative corrections to quasi-elastic electron scattering [ 1, 2]. The suggestion had come from Bruno Touschek [ 3], at the time head of the theo- retical physics group at the Frascati National Laboratories near Rome. About the same time, Earle came from MIT to visit University of Rome and Frascati. G.P. was a young post-graduate, who had studied Earle’s papers and was awed by his already impressive scientific figure. After almost 40 years had passed, Earle visited Italy with his wife Ruth, making Frascati their base for an extended visit of almost a month. They were housed in what was then the laboratory hostel for foreign visitors, a small villa higher up above the hill, toward the town of Frascati. Since then, we became close friends, a friendship which included both his family and ours, and which has been very important for us. In memory of that first visit and in gratitude for the many years of friendship, we will tell here a story of infrared radiative corrections to charged particle scattering, to which Earle’s papers gave an important contribution. |
| 5626 | 2020-11-09 | Asymmetric Elastoplastic Behavior and Failure of GEM Foils | 2020 | INFN-20-16-LNF.pdf | G. Raffone | The nonlinear isotropic power hardening and the cohesive zone material (CZM) [1] criteria are applied in ANSYS® [2] finite element simulations to analyze very large deformations of the GEM foils up to the failure in uniaxial tensile tests. Some data available in literature concerning both the PI/Cu and the grain boundary interfaces are utilized. The computed progressive plasticization of the perforated thin multilayer agree very well with the experimental results published by some researchers [3–6]. However the present work provides a different explanation of that behavior (already suggested in an earlier note of the author [7]) and it should be considered as a critical review concerning the conclusions of the aforementioned works. |
| 5588 | 2020-11-02 | Updates on the INFN High Power Ka-band klystron amplifier design program | 2020 | INFN-20-15-LNF.pdf | M. Behtouei, B. Spataro, F. Di Paolo and A. Leggieri | In the framework of the “Compact Light XLS” project, a short ultra-high gradient lin-earizer working on the third harmonic of the main linac frequency is requested. Increas-ing gradients and reducing dimensions are requirements for XLS and all next genera-tion linear accelerators. Actually, ultra-compact normal conducting accelerating struc-tures, operating in the Ka-band regime ranging from 100 to 150 MV/m are required to achieve ultra-high gradients for research, industrial and medical applications. To fulfill these strong requirements, the R&D of a proper Ka-band klystron with RF power output and a high efficiency is mandatory. This contribution reports the design of a possible klystron amplifer tube operating on the <i>TM<sub>010</sub></i> mode at 36 GHz, the third harmonic of the 12 GHz linac frequency, with an effiency of 42% and a 16 MW RF power output. This contribution discusses also the high-power DC gun, the beam focusing channel and the RF beam dynamics. |
| 5461 | 2020-09-15 | The “Automated Welding Machine” in the integration process of the Detection Units of the KM3Net experiment:general description | 2020 | INFN-20-12-GE.pdf | G. Cacopardo, G. Ottonello, S. Ottonello, M. Cresta, F. Parodi, F. Pratolongo | This note describes one of the tools used during Process-1 of the integration of the Detection Units (DUs) in the KM3NeT experiment. In particular, the device is designed to seal the Break-out-box (BOB). The BOB is a box interface between a Digital Optical Module (DOM) and the electro-optical cable (VEOC) for power and optical connection of each optical module (DOM) to the DU. The original manual version of the tool developed by NIKHEF was automatized by INFN-LNS in order to guarantee a reproducible operation in the recursive process of the DU integration and two samples have been realized for the integration sites at LNS and Genova respectively. |
| 5462 | 2020-09-15 | The automation of the “Welding Machine” for the DUs integration in the KM3NeT experiment | 2020 | INFN-20-13-GE.pdf | G. Cacopardo, G. Ottonello, S. Ottonello, M. Cresta, F. Parodi, F. Pratolongo | This note describes some technical aspects, in particular the control system, of one of the tools used during Process-1 of the integration of the Detection Units (DUs) in the KM3NeT experiment. In particular, the device is designed to seal the Break-out-box (BOB). The BOB is a box interface between a Digital Optical Module (DOM) and the electro-optical cable (VEOC) for power and optical connection of each optical module (DOM) to the DU. The original manual version of the tool developed by NIKHEF was then automatized by INFN-LNS in order to guarantee a replicable operation in the recursive process of the DU integration and two samples have been developed for the integration sites at LNS and Genova respectively. The general principle and performances of the automated welding machine will be presented shortly in a dedicated INFN report. Here we summarize the cycle of the operations performed by the machine and how they are managed by corresponding control program and related electronics boards. |
| 5463 | 2020-09-15 | The automation of the “Welding Machine” for the DUs integration in the KM3NeT experiment | 2020 | INFN-20-14-GE.pdf | G. Cacopardo, P. Pollovio, C. Pizzorno, A. Trovato, A. Lo Cicero2, G. Tavilla, F. Parodi, G. Ottonello, S. Ottonello, M. Cresta | This note describes some technical aspects, in particular the control system, of one of the tools used during Process-1 of the integration of the Detection Units (DUs) in the KM3NeT experiment. In particular, the device is designed to seal the Break-out-box (BOB). The BOB is a box interface between a Digital Optical Module (DOM) and the electro-optical cable (VEOC) for power and optical connection of each optical module (DOM) to the DU. The original manual version of the tool developed by NIKHEF was then automatized by INFN-LNS in order to guarantee a replicable operation in the recursive process of the DU integration and two samples have been developed for the integration sites at LNS and Genova respectively. The general principle and performances of the automated welding machine will be presented shortly in a dedicated INFN report. Here we summarize the cycle of the operations performed by the machine and how they are managed by corresponding control program and related electronics boards. |
| 5459 | 2020-08-07 | Electron Gun and Magnetic Systems Studies for a 36 GHz Klystron Amplifier | 2020 | INFN-20-10-LNF.pdf | M. Behtouei, B. Spataro, F. Di Paolo, L. Valletti and A. Leggieri | Self consistent analytic and numeric design for a set of innovative electron guns suitable for Ka-band klystrons is proposed in this paper. The proposed electron sources are designed to produces narrow beam with high currents that can be used in devices with critical dimensions. The proposed set of electron gun is destined to high power klystrons to be used as power sources for accelerating structures operating in Ka-Band. This family of accelerators is foreseen to achieve energy gradients around 150 MV/m. A klystron amplifier is being investigated in order to feed a linearizer structure. In this paper different electron gun and beam focusing channel designs are presented. |
| 5460 | 2020-08-07 | The Ka-Band High Power Klystron Amplifier Design Program of INFN | 2020 | INFN-20-11-LNF.pdf | M. Behtouei, B. Spataro, F. Di Paolo, S. Fantauzzi and A. Leggieri | Novel accelerating structures operating in Ka-Band are foreseen to achieve gradients around 150 MV/m. Among applications of Ka-Band accelerating structures in this contribution we describe the linearization of the longitudinal phase-space for the Compact Light XLS project. We also describe and characterize a Klystron amplifier to feed a linearizer structure. The design here presented includes the high-power DC gun, the beam focusing channel and the RF beam dynamics. |
| 5458 | 2020-07-28 | Application of Fractional Operators in Physics and Engineering | 2020 | INFN-20-09-LNF.pdf | M. Behtouei, L. Faillace, L. Palumbo, B. Spataro, A. Variola and M. Migliorati | In this paper we present a solution to a fractional integral of order 3/2 with the use of fractional Cauchy-like integral formula. The integral arises during the solution of Biot-Savart equation to find the exact analytical solution for the magnetic field components of a solenoid. The integrals are computed by cutting the branch line in order to have an analytic function inside the integral instead of multi-valued operation. |
| 5457 | 2020-06-26 | First characterisation of the PADME electromagnetic calorimeter | 2020 | INFN-20-08-LNF.pdf | G. Piperno | The PADME experiment, hosted at the LNF Beam Test Facility, is searching for a dark photon that decays into dark matter particles. This search is performed looking for the reaction e<sup>+</sup> + e<sup>-</sup> -> A<sup>'</sup> + γ, where A<sup>'</sup>; is the dark photon, which cannot be observed directly or via its decay products. A key role in the experiment is played by the electromagnetic calorimeter, which measures the energy and the position of the γ in the final state. From this, the missing four-momentum carried away by the A<sup>'</sup>; can be evaluated and the particle mass can be inferred. This article will present the process followed for the construction and calibration of the electromagnetic calorimeter of the experiment. The results achieved in terms of equalisation, detection efficiency and energy resolution during the first phase of the experiment, demonstrate the effectiveness of the various devices used to improve the calorimeter performance with respect to first prototypes. |
| 5456 | 2020-06-10 | MUFASA: MUon FAst Simulation Algorithm | 2020 | INFN-20-07-LNF.pdf | A. Ciarma | This note describes the simulation code named MUFASA (MUon FAst Simulation Algorithm), developed to study the muon pair production due to the interaction of a positron beam with a target using a custom Monte Carlo, while also providing an interface with the particle tracking code MADX PTC. MUFASA is a powerful tool developed as a start-toend simulation code for the study of the muon production and accumulation process for the Low EMittance Muon Accelerator (LEMMA) [1], in order to test different targets, optics and configurations. In this paper the structure of the code is described and validation tests performed with GEANT4 [2] together with some example of results are shown. |
| 5454 | 2020-05-22 | Sistema di movimentazione del tracciatore a pixel del Precision Proton Spectrometer di CMS | 2020 | INFN-20-05-GE.pdf | Stefano Cerchi, Rosanna Puppo, Enrico Robutti, Cecilia Rossi, Andrea Trovato | Il presente lavoro descrive il sistema di movimentazione del tracciatore PPS dell’esperimento CMS. Scopo del sistema di movimentazione è quello di minimizzare la disuniformità di danneggiamento dei chip di lettura dei rivelatori. Il sistema è stato progettato e prodotto presso la Sezione di Genova dell’INFN. Vengono inoltre descritti alcuni test preliminari di funzionamento. |
| 5455 | 2020-05-22 | A GEM-based Optically Readout Time Projection Chamber for charged particle tracking | 2020 | INFN-20-06-LNF.pdf | V. C. Antochi, G. Cavoto1,, I. A. Costa, E. Di Marco, G. D’Imperio, F. Iacoangeli, M. Marafini, A. Messina, D. Pinci, F. Renga, C. Voena, E. Baracchini, A. Cortez, G. Dho, L. Benussi, S. Bianco, C. Capoccia, M. Caponero, G. Maccarrone, G. Mazzitelli, A. Orlandi, E. Paoletti, L. Passamonti, D. Piccolo, D. Pierluigi, F. Rosatelli, A. Russo, G. Saviano, S. Tomassini, R. A. N´obrega and F. Petruci | The Time Projection Chamber (TPC) is an ideal candidate to track particles in a wide range of energies. Large volumes TPCs can be readout with a suitable number of channels offering a complete 3D reconstruction of the charged particle tracks and of their released energy allowing the identification of their mass. Moreover, He-based TPC’s are very promising to study keV energy particles, opening the possibility for directional searches of Dark Matter (DM) and the study of Solar Neutrinos (SN). On the other hand, in order to reach a keV energy threshold, a large number of channels is required to obtain a high granularity, that could be expensive and hard to manage. A small prototype (named LEMOn) to test and validate an innovative read-out technique is described here. It based on the amplification of the ionization in Micro Pattern Gas Detector (MPGD) producing visible light collected by a sub-millimeter position resolution sCMOS (scientific CMOS) camera. This type of readout - in conjunction with a fast light detection - allows a 3D reconstruction of the tracks, a sensitivity to the track direction and a very promising particle identification capability useful to distinguish DM nuclear recoils from a γ-induced background. |
| 5453 | 2020-05-01 | Bruno Touschek in Glasgow. The making of a theoretical physicist | 2020 | INFN-20-03-LNF.pdf | Giulia Pancheri, Luisa Bonolis | In the history of the discovery tools of last century particle physics, central stage is taken by elementary particle accelerators and in particular by colliders. In their start and early development, a major role was played by the Austrian born Bruno Touschek, who proposed and built the first electron positron collider, AdA, in Italy, in 1960. In this note, we present a period of Touschek’s life barely explored in the literature, namely the five years he spent at University of Glasgow, first to obtain his doctorate in 1949 and then as a lecturer. We shall highlight his formation as a theoretical physicist, his contacts and correspondence with Werner Heisenberg in G¨ottingen and Max Born in Edinburgh, as well as his close involvement with colleagues intent on building modern particle accelerators in Glasgow, Malvern, Manchester and Birmingham. We shall discuss how the Fuchs affair, which unraveled in early 1950, may have influenced his decision to leave the UK, and how contacts with the Italian physicist Bruno Ferretti led Touschek |
| 5452 | 2020-04-28 | Analisi della evoluzione delle tecnologie hardware per il Calcolo Scientifico | 2020 | INFN-20-04-CCR.pdf | Alessandro Brunengo, Gianpaolo Carlino, Andrea Chierici, Luca Dell'Agnello, Alessandro De Salvo, Sergio Fantinel, Gaetano Maron, Enrico Mazzoni, Michele Michelotto, Vladimir Sapunenko, Stefano Zani | Gli esperimenti della fisica HEP avranno bisogno, nel prossimo decennio, di strumenti di calcolo di enorme potenza, che le tecnologie attuali non potranno soddisfare. Questo lavoro è un'analisi dell'evoluzione delle tecnologie di CPU, di storage e di rete, volta a valutare alcuni degli indicatori (prestazioni, consumi) su cui poter basare la progettazione di un centro di calcolo valida per i prossimi 10 anni. Previsioni sull'evoluzione tecnologica di tale durata sono facilmente soggette ad errori di valutazione anche macroscopici: roadmap valide solo per tre-quattro anni, inaspettati balzi tecnologici, imprevedibili mutamenti di andamento del mercato, possono facilmente cambiare o anche ribaltare previsioni così a lungo protratte nel futuro, ed invalidare estrapolazioni per quanto accurate. Ciononostante, un'analisi della situazione e di quello che oggi può essere detto in relazione all'evoluzione di queste tecnologie è un punto di partenza senza il quale non sarebbe possibile fare alcun tipo di ipotesi. |
| 5451 | 2020-04-16 | The cryogenic magneto-optical device for terahertz radiation detection | 2020 | INFN-20-02-LNF.pdf | S.J. Rezvani, D. Di Gioacchino1, S. Tofani2, A. D’Arco3, S. Lupi3 C. Gatti1, M. Cestelli Guidi1, A. Marcelli1 | We present here a small-scale liquid helium (LH) immersion cryostat with an innovative optical setup suitable to work in long wavelength radiation ranges and under applied magnetic field. The cryostat is a multi stage device with several shieldings in addition to several optical stages. The system has been designed with an external liquid nitrogen boiler to reduce the liquid bubbling. The optical and mechanical properties of the optical elements were calculated and optimized for the designed configuration while the optical layout has been simulated and optimized among different configurations based on the geometry of the device. The final design has been optimized for low noise radiation measurements of proximity junction arrays under applied magnetic field in the wavelength range λ=250-2500 µm. |
| 5450 | 2019-11-29 | Ideas for extending the Frascati LINAC positron beam pulses for the resonant search of a <em>X</em>(17 MeV) boson. | 2019 | INFN-20-19-ROMA1.pdf | P. Valente | The results on the so-called <sup>8</sup>Be anomaly, recently corroborated by similar experimental evidence in the radiative transitions of excited <sup>4</sup>He nuclei, could be justified by the creation of a new particle with a mass of <em>m</em><sub>X</sub> ~16.7 MeV/c <sup>2</sup>. The PADME experiment, designed for searching light dark sector particles, like a dark photon or an axion-like particle, both in ϒ+ missing energy and e<sup>+</sup>e<sup>-</sup> final states, has the potential of performing a completely independent search, also exploiting the cross-section enhancement at the resonance √s~m<sub>X</sub>. In the case of the <em>X</em>(17 MeV) boson, this corresponds to a positron energy of 282 MeV when annihilating on electrons at rest. In order to keep the pile-up and the over-veto probabilities under control, the positron beam hitting the PADME active target should be as much diluted in time as possible. PADME has already collected a first data-set at the Frascati beam-test facility, using the positron beam accelerated by the DAΦNE LINAC, with maximum length of tilde ~200 ns and energy 490–550 MeV. In this note, the possible modifications to the RF system of the LINAC, aiming at further extending the pulse length at the expenses of the maximum beam energy, are briefly discussed. |
| 5449 | 2019-11-12 | Proposta per la definizione di INFN CSIRT | 2019 | INFN-19-19-CNAF.pdf | R. Veraldi e V. Ciaschini | Il seguente documento definisce l’implementazione generale di INFN CSIRT e le funzioni principali erogate per la propria constituency. |
| 5448 | 2019-11-07 | KLASH Conceptual Design Report | 2019 | INFN-19-18-LNF.pdf | D. Alesini et al. | The axion, a pseudoscalar particle originally introduced by Peccei, Quinn [1, 2], Weinberg [3], and Wilczek [4] to solve the “strong CP problem”, is a well motivated dark-matter (DM) candidate with a mass lying in a broad range from peV to few meV [5]. The last decade witnessed an increasing interest in axions and axion-like particles with many theoretical works published and many new experimental proposals [6] that started a real race towards their discovery. Driven by this new challenge and stimulated by the availability, at the Laboratori Nazionali di Frascati (LNF), of large superconducting magnets previously used for particle detectors [7, 8] at the DAFNE collider, we proposed to build a large haloscope [9] to observe galactic axions in the mass window between 0.2 and 1 μmeV [10]. This paper is the Conceptual Design Report (CDR) of the KLASH (KLoe magnet for Axion SearcH) experiment, designed having in mind the performance and dimensions of the KLOE magnet, a large volume superconducting magnet with a moderate magnetic field of 0.6 T. In the first part of this Report we discuss the physics case of KLASH, the theoretical motivation for an axion in the mass window 0:1 1μeV based on a review of standard and non-standard axion-cosmology (Sec. 1), and the physics reach of the KLASH experiment (Sec. 2), including both the sensitivity to QCD axions and to Dark-Photon DM. The sensitivity plots are based on the detector performance discussed in the second part of the CDR. Here, we summarize the results obtained with calculations and simulations of several aspects of the experiment: the mechanical construction of cryostat and cavity based on the study commissioned to the mechanical engineers of the Fantini-Sud company [11] (Sec. 3); the cryogenics plant (Sec. 4); the RF cavity design and tuning based on detailed simulations with code Ansys-HFSS (Sec. 5); the signal amplification, in particular the first stage based on a Microstrip SQUID Amplifier (Sec. 6). Finally, in Sec. 7, mainly based on the experience of existing experiments [12–14], we discuss the data taking, analysis procedure and computing requirements. The main conclusion we draw from this report is the possibility to build and put in operation at LNF in 2-3 years a large haloscope with the sensitivity to KSVZ axions in the low mass range between 0.2 and 1μeV in a region complementary to that of other experiments with a cost of about 3 MAC. Timeline and cost are competitive with respect to other proposals in the same mass region [15, 16] thanks to the availability of most of the infrastructure, in particular the superconducting magnet and the cryogenics plant. During the writing of this CDR, in July 2019, we were informed about the decision of INFN management to devote the KLOE magnet to the DUNE experiment at Fermilab. The KLOE magnet has always been the preferred choice for several reasons: it was in operation until 2018; its mechanical structure is able to support the several-tons weight of the cryostat and cavity; it is placed in the KLOE assembly-hall that can be used as the experimental area of KLASH. However, another option is given by the FINUDA magnet. The are few aspects to be explored (mechanical strength, move to experimental area, put in operation after more than 10 years), but it has a higher nominal field of 1.1 T in a large volume with an inner radius 1385 mm and length 3800 mm. A preliminary estimate of sensitivity to axions of FLASH, the haloscope built with the FINUDA magnet, gives results similar to those obtained for KLASH. This option will be eventually investigated in another document. |
| 5444 | 2019-10-10 | Bruno Touschek in Germany after the war: 1945-46 | 2019 | INFN-19-17-LNF.pdf | Bonolis L. Pancheri G. | Bruno Touschek was an Austrian born theoretical physicist, who proposed and built the first electron positron collider in 1960 in the Frascati National Laboratories in Italy. In this note we reconstruct a crucial period of Bruno Touschek’s life so far scarcely explored, which runs from Summer 1945 to the end of 1946. We shall describe his university studies in G¨ottingen, placing them in the context of the reconstruction of German science after 1945. The influence of Werner Heisenberg and other prominent German physicists will be highlighted. In parallel, we shall show how the Allied decisions towards restructuring science and technology in the UK after the war effort, determined Touschek’s move to the University of Glasgow in 1947. |
| 5445 | 2019-10-06 | Sviluppo applicativo per l’integrazione della Coordinate Measuring Machine con un sensore ottico Confocal Chromatic Sensor | 2019 | INFN-19-16-GE.pdf | Antonello Mercenaro, Cecilia Rossi | Questo documento descrive l’upgrade del software della CMM (Coordinate Measuring Machine) per l’integrazione della stessa con uno strumento di misura ottica. L’applicativo sviluppato, denominato PC DMIS Automation Support Tool, è stato realizzato per eseguire misure di rivelatori soggetti a stress termici per l’esperimento ATLAS-ITk. L’integrazione dei due strumenti amplia notevolmente le potenzialità del Centro Misure presente in Sezione, consentendo misure prima impossibili. |
| 5441 | 2019-07-19 | Nb superconductive thin film coating on flat Cu disks for high gradient applications | 2019 | INFN-19-15-LNF.pdf | Marcelli A. et al. | In this work we present the characterization of Nb superconductive films deposed on copper substrates with two different techniques: the PVD magnetron sputtering and the Pulsed Laser Ablation. In the first method Nb films ~3 μm thick were deposited with an average roughness of 160 nm. The superconductivity properties of these films were also determined with a 4-probe resistivity measurement. Data show a superconducting transition at 9.6Κ as expected from Nb films. With the second technique thick Nb films were deposited on copper substrates using the Pulsed Laser Ablation. In this case the Rutherford Backscattering was used to determine the thickness and the chemical state of these films that show different degrees of oxidation. |
| 5442 | 2019-07-19 | THE SCIENTIST' EXPERIENCE IN PARTICIPATED SCIENCE COMMUNICATION | 2019 | INFN-19-13-LNF.pdf | Mazzitelli G. et al. | Since 2006 a small group of researchers from the Italian National Institute for Nuclear Physics started to realized one of the first European Researchers’ Night in Europe: a one night-event, supported by the European Commission, that falls every last Friday of September to promote the researcher’s figure and its work. Today, after thirteen editions, the project has evolved by involving more than 60 scientific partners and more than 400 events/year spread from the North to the South of Italy in 30 cities, captivating more than 50.000 attendees with a not negligible impact on the people and the press. During the years, the project has followed and sometimes anticipated the science communication trend, and BEES (BE a citizEn Scientist) is the last step of this long and thrilling evolution that brought to a huge public engagement in our territory. The experience, the methodology, and the major successful examples of the organized events are presented together with the results of the long term project impact. |
| 5443 | 2019-07-19 | PHYSICALLY IMPOSSIBLE? | 2019 | INFN-19-14-LNF.pdf | D. Domenici, G. Mazzitelli | Halfway between the experiment and the focus group, between the quiz and a game, we have experienced a new format to 'focus' on sustainability and the fundamental laws of thermodynamics and its principles. Concepts as reversibility, efficiency and entropy, are then 'visualized' by the participants, showing the relations with the economic value, waste, the energetics budget and raw material costs are explained from a different point of view, proving the physical limits to the economic growth and the environmental exploitation. |
| 5440 | 2019-07-08 | Initial electromagnetic and beam dynamics design of a Klystron amplifier for Ka-Band Accelerating Structures | 2019 | INFN-19-12-LNF.pdf | Behtouei M. et al. | In the framework of the Compact Light XLS project a compact third harmonic RF accelerating structure at 35.982 GHz with respect to the main Linac frequency 11.994 GHz, working with an ultra-high gradient accelerating field in order to linearize the longitudinal space phase is adopted. To this end an innovative high power Ka band klystron operating at about 35.982 GHz has to be designed for feeding the linearizer structure. In addition, we also are planning to design a Ka band klystron operating on the third harmonic of TM01 mode. The generation of a high density electron beam by using the Pierce type electron gun is also requested. The electron gun goal is to produce a converging high beam current that matches to a focusing magnetic field in such way to obtain about 100 MW beam power. This paper proposes a possible design of a electron gun to be used in millimetric waves vacuum tubes. We here report the preliminary studies of the electron gun and the related beam dynamic. Estimations have been obtained by using the numerical code CST and analytical approaches. |
| 5439 | 2019-07-02 | A Ka-band TW accelerating structure as RF linearizer for the Compact Light XLS project | 2019 | INFN-19-11-LNF.pdf | Behtouei M. et al. | Ultra-high gradient accelerating structures are in strong demand for the next gener-ation of compact light sources. In the framework of the Compact Light XLS project, we have designed a higher harmonic RF accelerating structure in order to linearize the longi-tudinal space phase. We here present the design of a compact TW accelerating structure operating on the third harmonic with respect to the linac frequency (11.994 GHz) with a 100-125 MV/m accelerating gradient. Numerical electromagnetic simulations were car-ried out by using the numerical codes HFSS and CST. |
| 5438 | 2019-06-27 | Particle Astrophysics in Space with an Antimatter Large Acceptance Detector in Orbit (ALADINO) | 2019 | INFN-19-10-GE.pdf | O. Adriani, et al. | The note describes a proposal for a large acceptance magnetic spectrometer based on a novel superconducting magnet technology, equipped with a silicon tracker and a 3D isotropic calorimeter. ALADINO (Antimatter Large Acceptance Detector IN Orbit) is conceived to study anti-matter components of the cosmic radiation in an unexplored energy window which can shed light on new phenomena related to the origin and evolution of the Universe, as well as on the origin and propagation of cosmic rays in our galaxy. The main science themes addressed by this mission are therefore the origin and composition of the Universe (by means of direct search for primordial anti-nuclei in the Cosmic Ray (CR) flux and indirect search for Dark Matter signals in the CR anti-particle fluxes) as well as the origin and propagation of CR in the Galaxy (by means of precise measurements of the energy spectra and chemical composition of the CR). |
| 5437 | 2019-05-22 | CONJECTURE ON THE COSMIC RAYS SPECTRUM | 2019 | INFN-19-09-LNF.pdf | G. Pizzella | The PAMELA experiment has shown that a fraction of cosmic rays could be due to proton fluxes generated by the magnetosphere of the planet Jupiter. Thus, a conjecture that astrophysical objects provided by magnetospheres be sources of the cosmic radiation is put forward. With simple geometric considerations the energy spectrum E<SUP>-2.5</SUP> is obtained, independently on the particle species, very close to the experimental CR spectrum, under the hypothesis that particle acceleration mechanisms act uniformly in the magnetospheric region. |
| 5436 | 2019-05-08 | Science Communication a New Frontier of Researcher’s Job | 2019 | INFN-19-08-LNF.pdf | Mazzitelli G. | In the world of communication, nobody can be out of the fray! Since many years science communication and more in general the ability of a researcher to communicate his/her work to founding agency, policy makers, entrepreneurs and public at large, starts to be a fundamental skill of the researchers job. This skill is needed and requested to access funds and successfully disseminate the research outcome, as well as to engage society in understanding science and its benefits. Moreover, due to the large decrease of research funds and of people starting scientic carrier, researchers must be in the front line to promote the scientic culture in order to invert the dreadful trend of last years. Where are we and where are we going to? We try to answer such questions introducing successful models that can be used without huge overloads for our job. This paper reports on the experience of one of the largest and oldest project in Europe of the Marie Sklodowska-Curie Actions European Researchers’ Night and describes how this project followed the evolution in science communication. |
| 5435 | 2019-04-18 | Advanced beam protection systems for high-brightness electron-beam and linac-based Compton sources | 2019 | INFN-19-07-LNF.pdf | S. Pioli | The Gamma Beam System (GBS), within the ELI-NP project, under installation in Magurele (RO) by INFN, as part of EuroGammas association, can provide gamma rays that open new possibilities for nuclear photonics and nuclear physics. ELI-GBS gamma rays are produced by Compton backscattering to get monochromaticity (0,1 % bandwidth), high flux (10<SUP>13</SUP> photon/s), tunable directions and energies up to 19 MeV. Such gamma beam is obtained when a high-intensity laser collides a high-brightness electron beam with a repetition rate of 100 Hz in multi-bunch mode with trains of 32 bunches. An advanced high reliability and availability Machine Protection System, compliant with IEC-61508 Functional Safety regulation, has been developed in order to ensure proper automated operation for this challenging facility. Such system operates on different layers of the control system: it is equipped with an EPICS supervisor for on-line monitoring of all subsystems, different beam loss monitors to verify electron beam transport and gamma beam luminosity, a real-time interlock system based on distributed FPGA over EtherCAT to monitor vacuum and RF systems which requires fast response within next RF pulse. |
| 5434 | 2019-04-12 | CYGNO Conceptual Design Report | 2019 | INFN-19-06-Roma1.pdf | E. Baracchini e al. | The conceptual design of the experiment named CYGNO (a CYGNUs module with Optical readout) is presented here. CYGNO aims to make significant advances in the technology of single phase gas-only time projection chambers (TPC) for the specific application of rare scattering events detection. In particular it will focus on a read-out technique based on the GEM amplification of the ionisation and on the visible light collection with a sub-mm position resolution by sCMOS camera. This type of readout - in conjunction with a fast light detection - will allow to reconstruct three dimensional (3D) images of the recoiling particles with high precision, offering new ways to distinguish the electron and nuclear recoils. The recoil direction resolution is also being investigated as a further tool to reject neutral background in the detection of Galactic Dark Matter (DM) particles. The final goal is to build and operate a high resolution gas TPC detector at the 50 kg scale for the directional search of a DM signal, in underground Laboratori Nazionali del Gran Sasso. In order to achieve this very demanding goal, we are going to develop firstly a 1 m<SUP>3</SUP> volume, 1 kg mass detector based on these concepts, to assess on a real underground experiment the design performances and capabilities of our approach, while at the same time testing innovative techniques and methods to reach the 50 kg scale. This project is part of the world-wide effort of the CYGNUS collaboration to define an optimal DM detection scheme sensitive to DM direction, towards a one-ton gas TPC nuclear recoils observatory. |
| 5433 | 2019-02-26 | Expression of Intent “Singularity” | 2019 | INFN-19-05-LNF.pdf | Pioli S. | L’automazione dei processi che riguardano il commissioning e l’operazione di un acceleratore prevede in prima istanza l’integrazione di hardware per la gestione dei rischi nei sistemi crit- ici secondo standard di riferimento, come quello sulla Sicurezza Funzionale (IEC-61508) o la ANSI N43.1 “Radiation Safety for the design and operation of Particle Accelerator”, e successivamente l’inserimento di software di alto livello, intelligenza artificiale (IA), per l’operazione di un acceleratore tramite controllo automatizzato di differenti apparati. Le criticità peculiari dei diversi sistemi di un acceleratore richiederanno l’impiego di diverse tecnologie (FPGA veloci e sicure con connessione diretta all’hardware, server connessi al sistema di controllo, detector per il monitoraggio perdite di fascio, . . . ). Il progetto che si va a proporre punta a realizzare una piattaforma composita di diversi dispositivi che consentano di integrare intelligenze artificiali per il controllo e la gestione automatizzata di intere facility. Tali dispositivi dovranno essere realizzati e mantenuti secondo gli standard della Sicurezza Funzionale con design scalabile e modulare che ne permetta il versatile upgrade per soddisfare nuove richieste dell’acceleratore o l’applicazione su nuove infrastrutture. La possibilità di sviluppare una piattaforma con IA a cui vengano affidate mansioni specifiche per la gestione di un acceleratore, la prevenzione dei rischi e la relativa realizzazione dell’hardware necessario per l’integrazione di tale “intelligenza” permetterà di esplorare aspetti innovativi nel campo tecnologico quali: automazione di sistemi complessi, realizzazione ed integrazione di nuovo hardware per la diagnostica dei sistemi di un acceleratore. L’ente potà così beneficiare di una migliore gestione dei rischi e dei costi delle facility, ottimizzare l’up-time degli acceleratori e ridurre i costi del man-power coinvolto nella gestione e nella manutenzione di tali apparati. In aggiunta a questo, i dispositivi realizzati, essendo in conformità con gli standard industriali, potranno essere d’aiuto al trasferimento tecnologico arricchendo l’offerta con i partner. |
| 5432 | 2019-02-24 | Low cost SiPM-based detector for the measurement of the energy loss of a proton beam, with particular focus on the Bragg peak | 2019 | INFN-19-04-MI-Bicocca.pdf | V. Pagliarino, F. Serra, A. Robino, F. Filippa, R. Ponte, G. Branda, A. Massolino, A. Lovisolo, F. Boido | Nowadays, thanks to the spreading of different applications in the field of applied nuclear physics, such as proton therapy, detector testing and radiation hardness measurement, the number of particle beam facilities all around the world is significantly growing and the characterisation of these beams is becoming a very frequent operation. Here we present a low cost detector, made up by a student team selected by the Italian Institute for Nuclear Physics, for the study of the energy loss curve of charged particle beams, employing scintillator and SiPM technology, that allows both to make quick measurements without a complex setup and to run experiments for educational purposes, thanks to its expandable design. |
| 5431 | 2019-01-21 | TM oxides coatings for high demanding accelerator components | 2019 | INFN-19-03-LNF.pdf | J. Scifo et al. | Large electric gradients are required for a variety of new applications, notably including the extreme high brightness electron sources for X-ray free electron lasers (FELs), RF photoinjector, industrial and medical accelerators and linear accelerators for particle physics colliders. In the framework of a INFN-LNF, SLAC (USA), KEK (Japan), UCLA (Los Angeles) collaboration, the Laboratori Nazionali di Frascati (LNF) is involved in the modelling, development and test of RF structures devoted to acceleration with high gradient electric field of particles through metal device. In order to improve the maximum sustainable gradients in normal conducting RF accelerating structures, we had to minimize the breakdown and the dark current. To this purpose the study of new materials and manufacturing techniques is mandatory to identify solutions to such extremely demanding applications. We considered the possibility to coat copper (and other metals) with a relatively thick film to improve and optimize breakdown performances. We present here the first characterization of MoO<SUB>3</SUB> films deposited on copper by pulsed-laser deposition (PLD) starting from a commercial MoO<SUB>3</SUB> target. |
| 5427 | 2019-01-15 | CYGNO: a CYGNUs Collaboration 1 m<SUP>3</SUP> Module with Optical Readout for Directional Dark Matter Search | 2019 | INFN-19-02-LNF.pdf | CYGNO Collaboration | The design of the project named CYGNO is presented. CYGNO is a new proposal supported by INFN, the Italian National Institute for Nuclear Physics, within CYGNUs protocollaboration (CYGNUS-TPC) that aims to realize a distributed observatory in underground laboratories for directional Dark Matter (DM) search and the identification of the coherent neutrino scattering (CNS) from the Sun. CYGNO is one of the first prototypes in the road map to 100-1000 m<SUP>3</SUP> of CYGNUs and will be located at the National Laboratory of Gran Sasso (LNGS), in Italy, aiming to make significant advances in the technology of single phase gas-only time projection chambers (TPC) for the application to the detection of rare scattering events. In particular it will focus on a read-out technique based on Micro Pattern Gas Detector (MPGD) amplification of the ionization and on the visible light collection with a sub-mm position resolution sCMOS (scientific COMS) camera. This type of readout - in conjunction with a fast light detection - will allow on one hand to reconstruct 3D direction of the tracks, offering accurate sensitivity to the source directionality and, on the other hand, a high particle identification capability very useful to distinguish nuclear recoils. |
| 5426 | 2019-01-14 | MPGD Optical Read Out for Directional Dark Matter Search | 2019 | INFN-19-01-LNF.pdf | G. Mazzitelli et al. | The Time Projection method is an ideal candidate to track low energy release particles. Large volumes can be readout by means of a moderate number of channels providing a complete 3D reconstruction of the charged tracks within the sensitive volume. It allows the measurement not only of the total released energy but also of the energy release density along the tracks that can be very useful for particle identification and to solve the head-tail ambiguity of the tracks. Moreover, gas represents a very interesting target to study Dark Matter interactions. In gas, nuclear recoils can travel enough to give rise to tracks long enough to be acquired and reconstructed. |
| 5425 | 2018-12-31 | Bruno Touschek with AdA in Orsay and the first direct observation of electron-positron collisions | 2018 | INFN-18-12-LNF.pdf | Giulia Pancheri, Luisa Bonolis | We describe how the first direct observation of electron-positron collisions took place in 1963-1964 at the Laboratoire de l’Accélérateur Linéaire d’Orsay, in France, with the storage ring AdA, which had been proposed and constructed in the Italian National Laboratories of Frascati in 1960, under the guidance of Bruno Touschek. The obstacles and successes of the two and a half years during which the feasibility of electron-positron colliders was proved will be illustrated using archival and forgotten documents, in addition to transcripts from interviews with Carlo Bernardini, Peppino Di Giugno, Mario Fascetti, François Lacoste, and Jacques Haïssinski. |
| 5424 | 2018-10-31 | The system to fill with oil the empty Break Out Boxes (BOBs) of the KM3NeT Detection Units | 2018 | INFN-18-11-GE.pdf | R. Cereseto | The KM3NeT collaboration aims to construct the largest underwater neutrino telescope in the Mediterranean sea. The detector is located in two sites, one in front of Toulon at 2500m sea depth and one SE Capo Passero in Sicily at 3500m depth. On both sites, one or two blocks of 115 Detection Units (DU) are connected to shore , each Du being composed by a Vertical Electro-Optical Cable (VEOC) connecting 18 Digital Optical Modules (DOMs). In this report we describe the integration of the DU carried out in our INFN laboratory in Genova, in particular one important phase of the process where some components in the VEOC have to be carefully filled with oil before connection to the DOMs. |
| 5423 | 2018-10-05 | Proposal for a possible use of DAFNE as an open infrastructure (DAFNE-TF) for the study of physics and innovative technologies for accelerators | 2018 | INFN-18-10-LNF.pdf | C. Bloise et al. | The conclusion of the Siddharta-2 run will make DAFNE available to accelerator researchers and technologists by 2020 onwards. This comprises an infrastructure made of a Linac, an accumulator, two storage rings for electrons and positrons, and a synchrotron-light laboratory with seven beam lines. A complex that is almost unique in the world, could become a test facility (DAFNE-TF) open to the international community for studies of accelerator technologies, beam physics, for small experiments, and to be used as a technological test bed for enterprises in the sector. This report, prepared for the INFN management, is intended to list some of the most interesting research options and to present a preliminary assessment of the operation costs together with the necessary refurbishments. |
| 5421 | 2018-09-19 | The KLASH – Letter of Intent | 2018 | INFN-18-09-LNF.pdf | D.Alesini et al. | Con questo documento proponiamo di effettuare una ricerca di assioni galattici nell’intervallo di massa tra 0.3 e 1 μeV usando una cavità risonante con un volume di circa 33 m<SUP>3</SUP> raffreddata a circa 4 K ed immersa in un campo magnetico di 0.6T generato dal magnete superconduttore costruito per l’esperimento KLOE situato ai Laboratori Nazionali di Frascati. Questo esperimento, chiamato KLASH (KLoe magnet for Axion SearcH), avrebbe la sensibilità necessaria ad osservare assioni QCD predetti dal modello KSVZ [1]. Nel seguito descriviamo brevemente il caso scientifico, l’apparato sperimentale e diamo una stima dei costi e dei tempi necessari alla realizzazione del progetto. |
| 5422 | 2018-08-23 | First magnetic measurements of fast-ramping dipole DHPTB102 of BTF upgraded beam-lines | 2018 | INFN-18-08-LNF.pdf | G. Armenti et al. | In the framework of the BTF upgrade, aimed at realizing two beam-lines serving two distinct experimental areas, the splitting of the beam coming from the Linac is realized by a dipole, labelled DPTB102, with a bending angle of 15° and a fast ramping (<100 ms) in order to optimize the duty-cycle. This note reports on the first dimensional checks and magnetic measurements, performed in DC, intended for verifying the basic parameters of the magnet, like the excitation curve, the maximum field, and field quality. |
| 5420 | 2018-07-27 | Construction techniques and performances of a full size prototype Micromegas chamber for the ATLAS muon spectrometer upgrade | 2018 | INFN-18-07-LNF.pdf | M. Alviggi, M. Antonelli, F. Anulli, C. Arcangeletti, P. Bagnaia, A. Baroncelli, M. Beretta, C. Bini, D. Calabrò, V. Canale, G. Capradossi, G. Carducci, A. Caserio, C. Cassese, S. Cerioni, G. Ciapetti, V. D’Amico, B. De Fazio, M. Del Gaudio, C. Di Donato, R. Di Nardo, D. D’Uffizi, E. Farina, R. Ferrari, A. Freddi, C. Gatti, G. Gaudio, E. Gorini, F. Gravili, S. Guelfo Gigli, A. Innocente, G. Introzzi, M. Iodice, A. Kourkoumeli-Charalampidi, F. Lacava, A. Lanza, L. La Rotonda, S. Lauciani, L. Luminari, G. Maccarrone, G. Mancini, L. Martinelli, P. Massarotti, A. Miccoli, A. Mirto, S. Palazzo, G. Paruzza, F. Petrucci, L. Pezzotti, G. Pileggi, A. Policicchio, G. Pontoriere, B. Ponzio, E. Romano, V. Romano, L. Roscilli, G. Rovelli, C. Scagliotti, M. Schioppa, G. Sekhniaidze, M. Sessa, S. Sottocornola, P. Turco, M. Vanadia, D. Vannicola, T. Vassileva, V. Vecchio, F. Vercellati, A. Zullo | A full scale prototype of a Micromegas precision tracking chamber for the upgrade of the ATLAS detector at the LHC Collider has been built between October 2015 and April 2016. This paper describes in detail the procedures used in constructing the single modules of the chamber in various INFN laboratories and the final assembly at the Frascati National Laboratories (LNF). Results of the chamber exposure to the CERN H8 beam line in June 2016 are also presented. The performances achieved in the construction and the results of the test beam are compared with the requirements, which are imposed by the severe environment during the data-taking of the LHC foreseen for the next years. |
| 5419 | 2018-07-04 | THE INTEGRATION OF THE DETECTION UNITS OF KM3NET IN GENOVAR | 2018 | INFN-18-06-GE.pdf | R. Cereseto et al. | The KM3NeT experiment (1) for the detection of high energy cosmic neutrinos is being built in two sites of the Mediterranean Sea: Capo Passero in Sicily and Toulon in the French coast. The full detection system includes 3 building blocks of Detection Units (DU) (2), each block of 115 DUs. The DU accommodates up to 18 digital optical modules (DOMs) (3). In this note we describe the facility to integrate the DOMs to the vertical cable of the line (VEOC) as realized in our ground floor laboratory of the INFN Institute in Genova. Pubblicato |
| 5418 | 2018-06-04 | Bruno Touschek and AdA: from Frascati to Orsay | 2018 | INFN-18-05-LNF.pdf | Luisa Bonolis, Giulia Pancheri | This paper is dedicated to the memory of Bruno Touschek, who passed away forty years ago, in Innsbruck, Austria, on May 25th, 1978. The first electron-positron collisions in a laboratory were observed in 1963-1964 at the Laboratoire de l’Accélérateur Linéaire d’Orsay, in France, with the storage ring AdA, which had been constructed in the Italian National Laboratories of Frascati in 1960, under the guidance of Bruno Touschek. The making of the collaboration between the two laboratories included visits between Orsay and Frascati, letters between Rome and Paris, and culminated with AdA leaving Frascati on July 4th, 1962 to cross the Alps on a truck, with the doughnut degassed to 10<sup>-</sup9mmHg through pumps powered by heavy batteries. This epoch-making trip and the exchanges which preceded it are described through unpublished documents and interviews with some of its protagonists, Carlo Bernardini, Fraçois Lacoste, Jacques Hassïnski, Maurice Lévy |
| 5417 | 2018-05-15 | Sistema per la manipolazione remota in vuoto dei bersagli per la camera di reazione di GALILEO installata presso i LNL | 2018 | INFN-18-04-MI.pdf | S. Coelli et al. | The realisation of a remotely-controlled target-exchange system for the multi-detector array GALILEO has been proposed to the Mechanical Design and Machine Workshop Department of INFN Milano, with the following requirements: possibility of pre-loading 7<sup>-</sup>10 targets, including quartz and collimators for beam centering procedures; downstream location in front of the beam-dump, almost 3 m away from the scattering chamber; minimum material which can interact with the beam, and under vacuum working conditions, with pressures around 10<sup>-</sup>6 mbar. The system has been designed and built within the Mechanical Design and Machine Workshop Department of INFN-Milano and installed onto the GALILEO beam line at the LNL INFN laboratories in Legnaro. |
| 5416 | 2018-05-07 | EuPRAXIA@SPARC_LAB Conceptual Design Report | 2018 | INFN-18-03-LNF.pdf | D. Alesini, et al | |
| 5413 | 2018-03-26 | Proposal of an experimental test at DAϕNE for the low emittance muon beam production from positrons on target | 2018 | INFN-18-02-LNF.pdf | M. Boscolo, et al. | We present in this paper the proposal of an experimental test at DANE of the positronring- plus-target scheme foreseen in the Low EMittance Muon Accelerator. This test would be a validation of the on-going studies for LEMMA and it would be synergic with other proposals at DAϕNE after the SIDDHARTA run. We discuss the beam dynamics studies for different targets inserted in a proper location through the ring, i.e. where the beam is focused and dispersion-free. Optimization of beam parameters, thickness and material of target and optics of the target insertion are shown as well. The development of the existent diagnostic needed to test the behavior of the circulating beam is described together with the turn-by-turn measurement systems of charge, lifetime and transverse size. Measurements on the temperature and thermo-mechanical stress on the target are also under study. |
| 5412 | 2018-02-28 | A Novel Highly Symmetric TM Mode Launcher for Ultimate Brightness Applications | 2018 | INFN-18-01-LNF.pdf | G. Castorina et al | The R&D of high gradient radiofrequency (RF) devices is aimed to develop innovative accelerating structures based on new manufacturing techniques and materials in order to construct devices operating with the highest accelerating gradient. Recent studies have shown a large increase in the maximum sustained RF surface electric fields in copper structures operating at cryogenic temperatures. These novel approaches allow significant performance improvements of RF photoinjectors. Indeed the operation at high surface fields results in considerable increase of electron beam brilliance. This enhancement requires high field quality in the RF photoinjector and, specifically in the design of the power coupler. In this work we present a novel device for the RF photoinjector: a compact X-band TM01 mode launcher with a fourfold symmetry which minimizes both dipole and quadrupole RF components. |
| 5411 | 2017-12-31 | LUNA MV Proposal 2018 - 2022 | 2017 | INFN-17-19-LNGS.pdf | P. Prati et al | This is the proposal of the LUNA MV Experiment |
| 5410 | 2017-10-25 | EX-TRIM A proposal for a Coherent Imaging XUV-FEL users endstation | 2017 | INFN-17-18-LNF.pdf | S. Bartocci et al | A proposal for building a Free Electron Laser, Eupraxia@SPARClab, at the Laboratori Nazionali di Frascati, is at present under consideration. This FEL facility would produce ultra-bright photon pulses with durations of few femtoseconds and a wavelength in the extreme ultraviolet region. In this document we describe the proposal for a user endstation that will enable exploiting the high-brilliance, coherent photon flux to perform coherent imaging experiments on a variety of samples, ranging from biological objects to metals and superconductors. Details about the photon beamline, the experimental chamber, sample delivery, photon detection and computational requirements are discussed. Keywords: Free Electron Laser, Coherent Imaging, X-ray optics. |
| 5409 | 2017-07-03 | BEAM TEST OF ALPIDE SENSOR | 2017 | INFN-17-16-LNF.pdf | A. Fantoni, P. Gianotti, P. Larionov, P. F.T. Matuoka, V.a Muccifora, S. Pisano, F. Ronchetti, E. Spiriti, M. Toppi | The Alice Pixel Detector (ALPIDE) is developed for the upgrade of the Inner Tracking System of the ALICE experiment at CERN, which will take place during second Long Shutdown in 2019-2020. ALPIDE is a Monolithic Active Pixel Sensor (MAPS), manufactured in a 180 nm CMOS Imaging Process of TowerJazz. Forecoming tracking detectors, based on this technology, will see strong advantages with the application of these sensors as they provide the highest capabilities in spatial resolution and utmost potential for being thin. In this work, the results of the ALPIDE sensor beam test, which took place at the Beam Test Facility of Laboratori Nazionali di Frascati, are presented |
| 5408 | 2017-06-28 | Characterization of the transport properties of MoO<sub>3</sub> films on copper | 2017 | INFN-17-13-LNF.pdf | C. Bonavolontà, M. Valentino, M. de Lucia, M. Ambrosio, C. Aramo, S. Macis, I. Davoli, G. Castorina, F. Monforte, B. Spataro, M. Scarselli, S. Lupi< and A. Marcelli | In this study we report the first transport experiments performed on a series of thin films of MoO<sub>3</sub> grown on a thick Cu substrate. Electrical resistance measurements have been performed for different film thickness as function of temperature down to ~20 K. Data show, due to the copper substrate, that thin films of molybdenum trioxide also at low temperature exhibits a metallic behaviour while for films with a thickness > 250 nm the semiconducting behaviour start to prevail on the metallic one. Local morphological properties and optical data are also showed to support the interpretation of the conductive behaviour of these thin layers of molybdenum oxides. |
| 5407 | 2017-06-26 | The KLASH Proposal - Axion Calling | 2017 | INFN-17-14-LNF.pdf | D. Alesini, D. Babusci, D. Di Gioacchino, C. Gatti, G. Lamanna, C. Ligi | We propose a search of galactic axions with mass about 0.2 μeV using a large volume resonant cavity, about 50 m<sup>3</sup>, cooled down to 4 K and immersed in a moderate axial magnetic field of about 0.6 T generated inside the superconducting magnet of the KLOE experiment [1] located at the National Laboratory of Frascati of INFN. This experiment, called KLASH (KLoe magnet for Axion SearcH) in the following, has a potential sensitivity on the axion-to-photon coupling, g<sub>aγγ</sub>, of about 6 X 10<sup>-17</sup> GeV<sup>-1</sup>, reaching the region predicted by KSVZ [2] and DFSZ [3] models of QCD axions. |
| 5406 | 2017-06-20 | POSEYDON – Converting the DAΦNE Collider into a double Positron Facility: a High Duty-Cycle pulse stretcher and a storage ring | 2017 | INFN-17-15-LNF.pdf | P. Valente | This project proposes to reuse the DAΦNE accelerator complex for producing a high intensity (up to 1010), high-quality beam of high-energy (up to 500 MeV) positrons for HEP experiments, mainly – but not only – motivated by light dark particles searches. Such a facility would provide a unique source of ultra-relativistic, narrow-band and low-emittance positrons, with a high duty factor, without employing a cold technology, that would be an ideal facility for exploring the existence of light dark matter particles, produced in positronon- target annihilations into a photon+missing mass, and using the bump-hunt technique. The PADME experiment, that will use the extracted beam from the DAΦNE BTF, is indeed limited by the low duty-factor (10-5=200 ns/20 ms). The idea is to use a variant of the third of integer resonant extraction, with the aim of getting a <10-6 m⋅rad emittance and, at the same time, tailoring the scheme to the peculiar optics of the DAΦNE machine. In alternative, the possibility of kicking the positrons by means of channelling effects in crystals can be evaluated. This would not only increase the extraction efficiency but also improve the beam quality, thanks to the high collimation of channelled particles. This is challenging for < GeV leptons, and in particular this would be the first positron beam obtained with crystal-assisted extraction (generally limited to protons and ions). The availability of an intense extracted positron beam with a tuneable pulse length will also enable other applications, ranging from radiation production from crystal undulators to irradiation for aerospace industry. The second ring can be used for storing positrons accelerated by the LINAC, both for producing synchrotron radiation (reversing the polarity of the ring currently used for electrons) and for machine studies with positively charged particles, like for instance instabilities driven by the electron cloud effect. |
| 5403 | 2017-06-01 | The Inelastic cross-section and Survival Probabilities at LHC in mini-jet models | 2017 | INFN-17-12-LNF.pdf | D. A. Fagundes, A. Grau, G. Pancheri, O. Shekhovtsova, Y. N. Srivastava | Recent results for the total and inelastic hadronic cross-sections from LHC experiments are compared with predictions from a single channel PDF driven eikonal mini-jet model and from an empirical model. The role of soft gluon resummation in the infrared region in taming the rise of mini-jets and their contribution to the increase of the total cross-sections at high energies are discussed. Sur- vival probabilities at LHC, whose theoretical estimates range from circa 10% to a few per mille, will be estimated in this model and compared with results from QCD inspired models and from multichannel eikonal models. We revisit a previous calculation and examine the origin of these discrepancies. |
| 5398 | 2017-05-29 | Relativistic Aspects of the Centripetal Force | 2017 | INFN-17-11-GE.pdf | M. Conte | The use of partially ionized atoms revolving in a storage ring is here proposed. Easy and low cost experiments, regarding the radiation emitted by these ions duly excited, can be performed. Particularly, the e ects of the centripetal force on the light spectrum can be analyzed. |
| 5397 | 2017-05-22 | Studio di fattibilità dei magneti in configurazione “Halbach” dello spettrometro dell’esperimento FOOT | 2017 | INFN-17-10-LNF.pdf | C. Sanelli | Questa nota presenta uno studio di fattibilit`a per dei magneti permanenti da utilizzare nella costruzione dello spettrometro dell’esperimento FOOT. Vengono presentate simulazioni magnetiche in 2D e 3D per differenti configurazioni dei magneti permanenti in configurazione “Halbach” facendo una valutazione comparativa delle dimensioni necessarie, in particolare per il materiale magnetico, per ottenere i valori di campo richiesti. Infine si presenta una simulazione di un sistema di due magneti cos`ı come al momento si pensa di realizzare il sistema finale dell’esperimento. |
| 5396 | 2017-04-27 | Time resolution of a Triple-GEM detector for future upgrade of the CMS muon system | 2017 | INFN_17_09_LNF_THESIS_.pdf | L. Benussi, E. Santovetti, A. Alfonsi | In this report results of the time resolution analysis of a GEM (Gas Electron Multiplier) detector prototype are discussed. This study was performed within the purview of an R&D activity regarding muon detectors for the CMS experiment, aiming at the future high luminosity upgrade of LHC, where a high-rate triggering for charged particles is needed. GEM chambers are particularly promising for this purpose, since they are able to handle the extremely high particle rates expected, especially in the muon forward region. The measurements were performed at the ASTRA facility of the INFN National Laboratory of Frascati (LNF). The study was accomplished by using cosmic muons, and by employing two different gas mixtures: Ar/CO2/CF4 (45%/15%/40%), and Ar/CO2 (70%/30%). |
| 5394 | 2017-04-10 | I Servizi Informatici Del TIFPA | 2017 | INFN-17-08-TIFPA.pdf | P. Spinnato | In questa nota sono descritti i servizi informatici del TIFPA. Viene fornita una panoramica della peculiare situazione in cui i servizi sono stati sviluppati, vengono descritte le sinergie attuate con i servizi informatici dell’Università di Trento, sono analizzate le soluzioni in cui l’interazione con l’Università si è rivelata la scelta migliore e quelle in cui la scelta più adeguata è stata una gestione autonoma del servizio. |
| 5395 | 2017-04-10 | Introduzione alla Cosmologia | 2017 | INFN-DIV-17-01-LNF.pdf | D. Babusci | |
| 5393 | 2017-04-07 | La realizzazione della sede del TIFPA | 2017 | INFN-17-07-TIFPA.pdf | P. Spinnato | In questa nota è illustrata l’attività svolta durante il primo anno di effettiva operatività del TIFPA allo scopo di realizzare un progetto per la ristrutturazione degli spazi da destinare a sede del Centro, all’interno dell’edificio di proprietà dell’Università degli Studi di Trento che ospita le attività del Dipartimento di Fisica. Vengono descritte le successive fasi di evoluzione del progetto, da quelle iniziali di definizione delle linee guida generali, fino alle attività conclusive di allestimento dei locali e dei laboratori. |
| 5392 | 2017-03-28 | U-LITE, 6 years of scientific computing at LNGS | 2017 | INFN-17-06-LNGS.pdf | B. Demin, S. Parlati, P. Spinnato, S. Stalio | The computing infrastructure of Laboratori Nazionali del Gran Sasso (LNGS) is the primary platform for data storage, analysis, computing and simulation of the LNGS-based experiments, which are part of the research activities of the Istituto Nazionale di Fisica Nucleare (INFN). Groups running such experiments have diverse needs, and adopt different approaches in developing the computing frameworks that support their activities. Since the emergence of the Cloud paradigm, the Computing and Network Service has built on its experience in operating and managing the LNGS computing infrastructure to develop U-LITE, a versatile environment apt at hosting such varied ecosystem and providing LNGS scientific users a familiar computing interface which hides all the complexities of a modern data center management. Over the last 6 years U-LITE has proved as a valuable tool for the LNGS experiments, and provides an example of effective use of the Cloud computing approach in a real scientific context. |
| 5391 | 2017-03-27 | The Water Properties of the Site in Capo Passero using the LED Beacon of the Prototype Tower | 2017 | INFN-17-05-GE.pdf | N. Briukhanova, C.M.F. Hugon, C. Nicolau, M. Sanguineti, M. Anghinolfi | In that work we study the scattering parameters of the water on the KM3Net site in Capo Passero. To this purpose we compare the real data from the time calibration runs of the detector to the results of a simulations of the light emission, propagation and detection according to the expeimental apparatus. |
| 5390 | 2017-03-06 | Feasibility of Stresses Release Monitoring of GEM Foils | 2017 | INFN-17-04-LNF.pdf | G. Raffone | A brief note concerning the evaluation of the strains to be measured on a typical GEM foil in order to monitor the possible release of stresses during long time operation in a severe environment |
| 5389 | 2017-03-02 | The High Voltage Regulator Board for the BDX Experiment | 2017 | INFN-17-03-GE.pdf | A. Celentano, M. Cresta, G. Minì, G. Ottonello,F. Pratolongo | In this note we describe the design and construction of SiPM High Voltage (HV) Regulator board for the BDX experiment. The board is used to provide bias voltage to the Silicon PhotoMultipliers (SiPMs) used in the BDX detector. It hosts four independent channels, each with a selectable output voltage in the range 37 V to 80 V: each channel is individually regulated by means of a variable resistor. In the note, after a brief introduction to the BDX experiment, we present the design of the board, discussing in particular the critical aspects that we identified during the circuit implementation phase. We also show the results obtained from the characterization of a first sample of 10 boards. |
| 5388 | 2017-02-02 | A Proposal for the IAXO Magnet System | 2017 | INFN-17-02-GE.pdf | R. Musenich, S. Farinon | The note describes a proposal for a superconducting toroidal magnet for the IAXO axion helioscope obtained assembling several canted solenoid dipoles. Respect to toroids made with racetrack coils, having the same average field, it has lower stored energy, lower peak magnetic field at the conductor and lower cold mass. |
| 5387 | 2017-01-18 | Implementation of a new Electronic Trigger for BOREX @ LNGS | 2017 | INFN-17-01-GE.pdf | M. Cariello | To adapt signals between the new trigger board and the DAQ of borexino experiment it was necessary to implement an interface board to deal with a large number of signals at different logic levels. |
| 5960 | 2016-12-20 | The PADME experiment Technical Proposal | 2016 | INFN-16-15-LNF.pdf | Mauro Raggi, Venelin Kozhuharov, Paolo Valente | |
| 5386 | 2016-11-30 | The system to mitigate sediment deposition in the upper surface of the Digital Optical Module in KM3NeT: PART II | 2016 | INFN-16-14-GE.pdf | M. Anghinollfi, C. D’Amato, A. Domi, C. Hugon, G. Riccobene | The experiments ANTARES and NEMO have shown the accumulation of a thin layer of material in the upper surface of the Optical Modules (OMs). The proposed vibration system to remove this sedimentation from the DOMs surface was tested successfully in a water tank at atmospheric pressure (see [2]). In this note we describe the behaviour of the system in an hyperbaric chamber at a pressure of 360 bar, close to the operating conditions in the sea. We find that the effect of the pressure does not significantly affect the vibration intensity in the glass sphere. |
| 5385 | 2016-11-03 | Introduction to the physics of the total cross-section at LHC - A Review of Data and Models | 2016 | INFN-16-13-LNF.pdf | G. Pancheri, and Y.N. Srivastava | This review describes the development of the physics of hadronic cross sections up to recent LHC results and cosmic ray experiments. We present here a comprehensive review - written with a historical perspective - about total cross-sections from medium to the highest energies explored experimentally and studied through a variety of methods and theoretical models for over sixty years. We begin by recalling the analytic properties of the elastic amplitude and the theorems about the asymptotic behavior of the total cross-section. A discussion of how proton-proton cross-sections are extracted from cosmic rays at higher than accelerator energies and help the study of these asymptotic limits, is presented. This is followed by a description of the advent of particle colliders, through which high energies and unmatched experimental precisions have been attained. Thus the measured hadronic elastic and total cross-sections have become crucial instruments to probe the so called soft part of QCD physics, where quarks and gluons are confined, and have led to test and re ne Regge behavior and a number of difiractive models. As the c.m. energy increases, the total cross-section also probes the transition into hard scattering describable with perturba- tive QCD, the so-called mini-jet region. Further tests are provided by cross-section measurements of γp, γ*p and γ*γ* for models based on vector meson dominance, scaling limits of virtual photons at high Q<sup>2</sup> and the BFKL formalism. Models interpolating from virtual to real photons are also tested. It seems to us to be a necessary task to explore bit-by-bit the rigorous consequences of analyticity, unitarity and crossing. Who knows if someday one will not be able to reassemble the pieces of the puzzle. - A. Martin and F. Cheung, based on 1967 A.M. Lectures at Brandeis Summer School and Lectures at SUNY and Stony Brook |
| 5383 | 2016-10-10 | Configuration of User/Node Affinity in a Sendmail+Dovecot+Squirrelmail E-Mail Cluster | 2016 | INFN-16-11-CCR.pdf | M. Bensi, S. Barberis, M. Mezzadri, F. Prelz | The storage of user e-mail boxes on a shared filesystem and their read/write access on multiple cluster nodes requires special care to benefit from file persistence in the filesystem cache on each node and to prevent system response to be significantly degraded by frequent file synchronisations onto physical storage. The simplest measure towards this goal is to divide access to nodes on a per-user basis, while keeping the cluster failsafe. In this paper we share a few non-obvious details for the configuration of such user/node affinity in sendmail, dovecot, squirrelmail. |
| 5384 | 2016-10-10 | DA-DA: a method to ease IPv6 Rollout at Non-SLAAC Sites | 2016 | INFN-16-12-CCR.pdf | F. Prelz | The exhaustion of IPv4 addresses is handled in version 6 of the IP suite of protocols via a massive (x296) increase of the available address space. EUI-64 based automatic addressing (SLAAC) becomes possible, but it is not the only option for address allocation in this wide space - in certain cases it may not be an option at all. A mechanism (DA-DA: DNS-driven Allocation of DHCPv6 Addresses) is proposed to provide public addresses to dual-stack IPv4/v6 hosts via DHCPv6 and to populate the DHCPv6 configuration database in the course of the IPv4  IPv6 transition. Address assignment is driven by the DNS contents only and (similarly to SLAAC) provides hosts with access to the public IPv6 Internet with no user intervention. A reference implementation (in the form of an ISC DHCPv6 patch) is available. |
| 5382 | 2016-06-30 | Studies of geometric wakefields and impedances due to collimators | 2016 | INFN-16-10-LNF.pdf | A. Brynes, G. Castorina, O. Frasciello, A. Marcelli, B. Spataro | In this note we study the geometric wakefields generated by a driving electron bunch in the SPARC LAB COMB chamber. Due to the change in iris radius of the beam pipe leading into the chamber, the electron beam will induce wakefields, which can have an effect on the bunches in the train used for the SL COMB experiment. Here, we present wakefields and impedances simulations and determine the effects that they may have on the beam properties. |
| 5381 | 2016-06-10 | The system to mitigate sediment deposition in the upper surface of the Digital Optical Module in KM3NeT | 2016 | INFN-16-09-GE.pdf | C. Hugon, A. Domi, M. Sanguineti, M. Anghinolfi | The experiments ANTARES and NEMO have shown the accumulation of a thin layer of material in the upper surface of the Optical Modules (OMs). This effect may represent a problem for the KM3NeT experiment in which the DOMs contain upward pointing photomultipliers also upwards, resulting in a loss of efficiency in Cherenkov photons detection. In this note we describe our investigations on a micro vibration system to remove the deposits from the DOMs’ surface. |
| 5380 | 2016-05-31 | Thermal Analysis of the Antineutrino <sup>144</sup>Ce Source Calorimeter fot the SOX Experiment | 2016 | INFN-16-08-GE.pdf | S. Farinon, R. Musenich, M. Pallavicini, F. Bragazzi, R. Cereseto, A. Caminata, L. Di Noto, P. Saracco, C. Rossi, G. Testera, S. Zavatarelli | The technical note describes the calorimeter which will be used to measure the activity of the antineutrino 144Ce source of the SOX experiment at the Gran Sasso Laboratories. The principle of the calorimeter is based on the measurement of both mass flow and temperature increase of the water circulating in the heat exchanger surrounding the source. The calorimeter is vacuum insulated in order to minimize the heat losses. The preliminary design and thermal Finite Element Analysis (FEA) are reported in the note. |
| 5379 | 2016-04-14 | Study of the displacement per atom in the n-alpha reaction on MgB<sub>2</sub> | 2016 | INFN-16-07-MI.pdf | F. Broggi, A. Bignami, C. Santini | In the frame of the High-Luminosity LHC*) project (Working Package 6.4, dedicated to the energy deposition and material studies), the effects of the energy deposition from the 7+7 TeV p-p debris on the High Temperature Superconducting Links (made of MgB2) is evaluated. This paper is focused on the effect of the n-alpha reaction on MgB2 and the determination of the induced Displacement per Atom (DPA). The contribution of the single component of the reaction i.e. neutrons, alpha particles and lithium atoms on the DPA is evaluated. |
| 5378 | 2016-04-06 | !CHAOS: final project report | 2016 | INFN-16-06-LNF.pdf | S. Angius, G. Baldini, C. Bisegni, S. Caschera, P. Ciuffetti, P. Conti, G. Di Pirro, F. Galletti, R. Gargana, O. Giacinti, E. Gioscio, D. Maselli, G. Mazzitelli, A. Michelotti, R. Orrù, M. Pistoni, F. Spagnoli, D. Spigone, A. Stecchi, T. Tonto, M. A. Tota L. Catani, C. Di Giulio, G. Salina P. Buzzi, B. Checcucci, P. Lubrano E. Fattibene, M. Panella M. Michelotto S. Aurnia, S. R. Cavallaro, B. F. Diana, E. Furia, S. Pulvirenti | |
| 5377 | 2016-03-17 | Parametric X-Ray detection in UA9 expreriment | 2016 | INFN-16-05-LNF.pdf | Dabagov S., Capitolo E., Gogolev A., Hampai D., Liedl A., Polese C. | Parametric X-Ray radiation (PXR) is a phenomenon due to the interaction of charged particles inside a crystal well ordered lattice. The passage of the particles inside the potential field into the crystal causes small deflections which result in radiation emissions. By this way the emission is diffracted by the crystal planes. In this work the results of the last five years of activity on PXR detection during UA9 experiment are reported. The beam provided in H8 area, protons or Pb ions, is channeled inside different crystals and PXR emission is detected. |
| 5376 | 2016-03-11 | Linear Accelerator Test Facility at LNF Conceptual Design Report | 2016 | INFN-16-04-LNF.pdf | P. Valente, M. Belli, B. Bolli, B. Buonomo, S. Cantarella, R. Ceccarelli, A. Cecchinelli, O. Cerafogli, R. Clementi, C. Di Giulio, A. Esposito, O. Frasciello, L. Foggetta, A. Ghigo, S. Incremona, F. Iungo, R. Mascio, S. Martelli, G. Piermarini, L. Sabbatini, F. Sardone, G. Sensolini, R. Ricci, L.A. Rossi, U. Rotundo, A. Stella, S. Strabioli, R. Zarlenga | |
| 5375 | 2016-02-17 | Unconventional physical way for the orbital velocity evaluation | 2016 | INFN-16-03-LNF.pdf | G. Modestino | The trajectory and the orbital velocity are determined for an object moving in a gravitational system, in terms of fundamental and independent variables. In particular, considering a path on equipotential line, the elliptical orbit is naturally traced, verifying evidently the keplerian laws. The case of the planets of the solar system is presented. |
| 5374 | 2016-02-04 | Feasibility study and performance evaluation of a GPFS based storage area accessible simultaneously through ownCloud and StoRM | 2016 | INFN-16-02-CNAF.pdf | A. Falabella, S. Taneja, M. Tenti | In this work, we demonstrate the feasibility of a GPFS based storage area accessible through both ownCloud and StoRM, as solution which allows VO’s with storage manager service to access directly the files through personal computer. Furthermore, in order to study its performance, in load situation, we set up two load balanced ownCloud web servers and a front-end, back-end and gridFTP StoRM server. A Python script was also developed to simulate user performing several file transfers both with ownCloud and StoRM. We employed the average file transfer time and efficiency as a figure of merit, which was measured as a function of the number of parallel running scripts. We observed that the average time increases almost linearly with the number of parallel running scripts, independently of the used software. |
| 5373 | 2016-01-27 | Personal recollections: Frascati and the search for gravitational waves at the Istituto Nazionale di Fisica Nucleare (INFN) | 2016 | INFN-16-01-LNF.pdf | G. Pizzella | |
| 5372 | 2016-01-18 | La Realtà Quantistica | 2016 | INFN-DIV-16-01-LNF.pdf | D. Babusci, M. Mascolo | |
| 5367 | 2016-01-14 | Fiber Bragg Grating (FBG) sensors as flatness and mechanical stretching sensors | 2015 | INFN-15-09-LNF.pdf | D. Abbaneo, M. Abbas, M. Abbrescia, A.A. Abdelalim, M. Abi Akl, O. Aboamer, D. Acosta, A. Ahmad, W. Ahmed, W. Ahmed, A. Aleksandrov, R. Aly, P. Altieri, C. Asawatangtrakuldee, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, V. Barashko, P. Barria, G. Bencze, N. Beni, L. Benussi (Corresponding Author), V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, A. Braghieri, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F.R. Cavallo, A. Celik, M. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, S. Czellar, M.M. Dabrowski, G. De Lentdecker, R. De Oliveira, G. de Robertis, S. Dildick, B. Dorney, W. Elmetenawee, G. Endroczi, F. Errico, A. Fenyvesi, S. Ferry, I. Furic, P. Giacomelli, V. Golovtsov, L. Guiducci, F. Guilloux, A. Gutierrez, R.M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, P. Iaydjiev, Y.G. Jeng, T. Kamon, P. Karchin, A. Korytov, S. Krutelyov, A. Kumar, H. Kim, J. Lee, T. Lenzi, L. Litov, F. Loddo, A. Madorsky, T. Maerschalk, M. Maggi, A. Magnani, P.K. Mal, K. Mandal, A. Marchioro, A. Marinov, R. Masod, N. Majumdar, J.A. Merlin, G. Mitselmakher, A.K. Mohanty, S. Muhammad, A. Mohapatra, J. Molnar, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L.M. Pant, P. Paolucci, I. Park, G. Passeggio, L. Passamonti, B. Pavlov, B. Philipps, D. Piccolo, D. Pierluigi, H. Postema, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, A. Ranieri, G. Rashevski, C. Riccardi, M. Rodozov, A. Rodrigues, L. Ropelewski, S. RoyChowdhury, A. Russo, G. Ryu, M.S. Ryu, A. Safonov, S. Salva, G. Saviano, A. Sharma, A. Sharma, R. Sharma, A.H. Shah, M. Shopova, J. Sturdy, G. Sultanov, S.K. Swain, Z. Szillasi, A. Tatarinov, T. Tuuva, M. Tytgat, I. Vai, M. Van Stenis, R. Venditti, E. Verhagen, P. Verwilligen, P. Vitulo, S. Volkov, A. Vorobyev, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang | A novel approach which uses Fibre Bragg Grating (FBG) sensors has been utilised to assess and monitor the flatness of Gaseous Electron Multipliers (GEM) foils. The setup layout and preliminary results are presented. |
| 5368 | 2016-01-14 | A novel application of Fiber Bragg Grating (FBG) sensors in MPGD | 2016 | D. Abbaneo, M. Abbas, M. Abbrescia, A.A. Abdelalim, M. Abi Akl, O. Aboamer, D. Acosta, A. Ahmad, W. Ahmed, W. Ahmed, A. Aleksandrov, R. Aly, P. Altieri, C. Asawatangtrakuldee, P. Aspell, Y. Assran, I. Awan, S. Bally, Y. Ban, S. Banerjee, V. Barashko, P. Barria, G. Bencze, N. Beni, L. Benussi (Corresponding Author), V. Bhopatkar, S. Bianco, J. Bos, O. Bouhali, A. Braghieri, S. Braibant, S. Buontempo, C. Calabria, M. Caponero, C. Caputo, F. Cassese, A. Castaneda, S. Cauwenbergh, F.R. Cavallo, A. Celik, M. Choi, S. Choi, J. Christiansen, A. Cimmino, S. Colafranceschi, A. Colaleo, A. Conde Garcia, S. Czellar, M.M. Dabrowski, G. De Lentdecker, R. De Oliveira, G. de Robertis, S. Dildick, B. Dorney, W. Elmetenawee, G. Endroczi, F. Errico, A. Fenyvesi, S. Ferry, I. Furic, P. Giacomelli, V. Golovtsov, L. Guiducci, F. Guilloux, A. Gutierrez, R.M. Hadjiiska, A. Hassan, J. Hauser, K. Hoepfner, M. Hohlmann, H. Hoorani, P. Iaydjiev, Y.G. Jeng, T. Kamon, P. Karchin, A. Korytov, S. Krutelyov, A. Kumar, H. Kim, J. Lee, T. Lenzi, L. Litov, F. Loddo, A. Madorsky, T. Maerschalk, M. Maggi, A. Magnani, P.K. Mal, K. Mandal, A. Marchioro, A. Marinov, R. Masod, N. Majumdar, J.A. Merlin, G. Mitselmakher, A.K. Mohanty, S. Muhammad, A. Mohapatra, J. Molnar, S. Mukhopadhyay, M. Naimuddin, S. Nuzzo, E. Oliveri, L.M. Pant, P. Paolucci, I. Park, G. Passeggio, L. Passamonti, B. Pavlov, B. Philipps, D. Piccolo, D. Pierluigi, H. Postema, A. Puig Baranac, A. Radi, R. Radogna, G. Raffone, A. Ranieri, G. Rashevski, C. Riccardi, M. Rodozov, A. Rodrigues, L. Ropelewski, S. RoyChowdhury, A. Russo, G. Ryu, M.S. Ryu, A. Safonov, S. Salva, G. Saviano, A. Sharma, A. Sharma, R. Sharma, A.H. Shah, M. Shopova, J. Sturdy, G. Sultanov, S.K. Swain, Z. Szillasi, A. Tatarinov, T. Tuuva, M. Tytgat, I. Vai, M. Van Stenis, R. Venditti, E. Verhagen, P. Verwilligen, P. Vitulo, S. Volkov, A. Vorobyev, D. Wang, M. Wang, U. Yang, Y. Yang, R. Yonamine, N. Zaganidis, F. Zenoni, A. Zhang | We present a novel application of Fiber Bragg Grating (FBG) sensors in the construction and characterisation of Micro Pattern Gaseous Detector (MPGD), with particular attention to the realisation of the largest triple (Gas electron Multiplier) GEM chambers so far operated, the GE1/1 chambers of the CMS experiment at LHC. The GE1/1 CMS project consists of 144 GEM chambers of about 0.5 m2 active area each, employing three GEM foils per chamber, to be installed in the forward region of the CMS endcap during the long shutdown of LHC in 2108-2019. The large active area of each GE1/1 chamber consists of GEM foils that are mechanically stretched in order to secure their flatness and the consequent uniform performance of the GE1/1 chamber across its whole active surface. So far FBGs have been used in high energy physics mainly as high precision positioning and re-positioning sensors and as low cost, easy to mount, low space consuming temperature sensors. FBGs are also commonly used for very precise strain measurements in material studies. In this work we present a novel use of FBGs as flatness and mechanical tensioning sensors applied to the wide GEM foils of the GE1/1 chambers. A network of FBG sensors have been used to determine the optimal mechanical tension applied and to characterise the mechanical tension that should be applied to the foils. We discuss the results of the test done on a full-sized GE1/1 final prototype, the studies done to fully characterise the GEM material, how this information was used to define a standard assembly procedure and possible future developments. | |
| 5369 | 2016-01-14 | Candidate eco-friendly gas mixtures for MPGDs | 2016 | L. Benussi, S. Bianco, G. Saviano, S. Muhammad, D. Piccolo, F. Primavera, M. Ferrini, M. Parvis, S. Grassing, S. Colafranceschi, J. Kjøbro, A. Sharma, D. Yang, G. Chen, Y. Ban, Q. Li | Modern gas detectors for detection of particles require F-based gases for optimal performance. Recent regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. This review studies properties of potential eco-friendly gas candidate replacements. | |
| 5370 | 2016-01-14 | Characterization of the GEM foil materials | 2016 | L.Benussi, S.Bianco, G.Saviano, S. Muhammad, D.Piccolo, G.Raffone, M.Caponero, L. Passamonti, D. Pierluigi, A. Russo, F. Primavera, S.Cerbelli, A. Lalli, M. Valente, M. Ferrini, B. Teissandier, M. Taborelli, M. Parvis, S. Grassini, J. Tirilló, F. Sarasini, A.V. Franchi | Systematic studies on the GEM foil material are performed to measure the moisture diffusion rate and saturation level. These studies are important because the presence of this compound inside the detector's foil can possibly change its mechanical and electrical properties and, in such a way, the detector performance can be affected. To understand this phenomenon, a model is developed with COMSOL Multhiphysics v. 4.3, which described the adsorption and diffusion within the geometry of GEM foil, the concentration profiles and the time required to saturate the foil. The COMSOL model is verified by experimental observations on a GEM foil sample. This note will describe the model and its experimental verification results. | |
| 5371 | 2016-01-14 | Fiber Bragg Grating sensors for deformation monitoring of GEM foils in HEP detectors | 2016 | L. Benussi, S. Bianco, M. Caponero, S. Muhammad, L. Passamonti, D. Piccolo, D. Pierluigi, G. Raffone, A. Russo, G. Saviano | Fiber Bragg Grating (FBG) sensors have been so far mainly used in high energy physics (HEP) as high precision positioning and re-positioning sensors and as low cost, easy to mount, radiation hard and low space- consuming temperature and humidity devices. FBGs are also commonly used for very precise strain measurements. In this work we present a novel use of FBGs as flatness and mechanical tensioning sensors applied to the wide Gas Electron Multiplier (GEM) foils of the GE1/1 chambers of the Compact Muon Solenoid (CMS) experiment at Large Hadron Collider (LHC) of CERN. A network of FBG sensors has been used to determine the optimal mechanical tension applied and to characterize the mechanical stress applied to the foils. The preliminary results of the test performed on a full size GE1/1 final prototype and possible future developments will be discussed. | |
| 5366 | 2015-10-27 | Relatività Speciale - Esercizi e Complementi | 2015 | INFN-DIV-15-03-LNF.pdf | D. Babusci | |
| 5365 | 2015-10-14 | Breve storia della ricerca delle oscillazioni nei neutrini solari ed atmosferici fino al 1998, con particolare riguardo all'esperimento MACRO | 2015 | INFN-15-08-LNF.pdf | F. Ronga | Comunemente si tende a indicare il 1998 come anno della scoperta delle oscillazioni di neutrino. In realtà la storia è molto più complessa ed è durata circa 30 anni. Durante questi anni vi è stato inoltre un dibattito spesso acceso sulla mancanza dei neutrini elettronici provenienti dal sole e sulla mancanza dei neutrini di tipo muonico nelle cascate dei raggi cosmici. Tale dibattito però era limitato ai pochi ricercatori coinvolti direttamente negli esperimenti. Nel 1998 l'evidenza divenne tale da cancellare tutti i dubbi ed il risultato venne accettato da tutta la comunità scientifica. A causa dei numerosi protagonisti di questa complessa vicenda il premio Nobel per le oscillazioni di neutrino è stato assegnato solo in questi giorni, il 6 ottobre 2015, dopo ben 17 anni, a Arthur McDonald per le oscillazioni dal sole e a Tataaki Kajita per le oscillazioni di neutrini atmosferici. Tali Nobel seguono quelli del 2002 a Raymond Davis jr e Masatoshi Koshiba aventi come motivazione ufficiale la prima rivelazione di neutrini astrofisici dal sole e dalla supernova del 1987. |
| 5364 | 2015-09-30 | Top Quark Pair Production in Association with a Jet with NLO QCD Off-Shell Effects at the Large Hadron Collider | 2015 | INFN-15-07-LNF.pdf | G. Bevilacqua, H. B. Hartanto, M. Kraus and M. Worek | We present a complete description of top quark pair production in association with a jet in the dilepton channel. Our calculation is accurate to next-to-leading order in QCD (NLO) and includes all non-resonant diagrams, interferences and off-shell effects of the top quark. Moreover, non-resonant and off-shell effects due to the finite W gauge boson width are taken into account. This calculation constitutes the first fully realistic NLO computation for top quark pair production with a final state jet in hadronic collisions. Numerical results for differential distributions as well as total cross sections are presented for the Large Hadron Collider (LHC) at 8 TeV. With our inclusive cuts, NLO predictions reduce the unphysical scale dependence by more than a factor of 3 and lower the total rate by about 13% compared to leading order QCD (LO) predictions. In addition, the size of the top quark off-shell effects is estimated to be below 2%. |
| 5363 | 2015-09-15 | Novel proposal for a low emittance muon beam using positron beam on target | 2015 | INFN-15-06-LNF.pdf | M. Antonelli, M. Boscolo, R. Di Nardo, P. Raimondi | Muon beams are customarily obtained via K=π decays produced in proton interaction on target. In this paper we investigate the possibility to produce low emittance muon beams from electron-positron collisions at centre-of-mass energy just above the μ+μ- production threshold with maximal beam energy asymmetry, corresponding to a positron beam of about 45 GeV interacting on electrons on target. We present the main features of this scheme with an outline of the possible applications. |
| 5362 | 2015-05-12 | What next at LNF: Perspectives of physics research at the Frascati National Laboratories | 2015 | INFN-15-05-LNF.pdf | F. Bossi (editor), D. Alesini, M.P. Anania, M. Antonelli, D. Babusci, A. Balerna, S. Bartalucci, M. Bazzi, M. Bellaveglia, S. Bellucci, G. Bencivenni, M. Benfatto, L. Benussi, M. Bertani, S. Bianco, S. Bistarelli, A. Boni, M. Boscolo, P. Branchini, B. Buonomo, P. Campana, C. Cantone, M. Caponero, A. Cataldo, M. Cestelli Guidi, E. Chiadroni, V. Chiarella, P. Ciambrone, A. Cianchi, R. Cimino, A. Clozza, C. Curceanu, S.B. Dabagov, R. Del Grande, S. Dell’Agnello, G. Delle Monache, E. De Lucia, R. De Sangro, A. De Santis, A. Di Domenico, D. Di Gioacchino, D. Di Giovenale, P. Di Nezza, D. Domenici, U. Dosselli, A. Drago, A. D’Uffizi, A. Fantoni, M. Ferrario, G. Finocchiaro, L. Foggetta, M. A. Franceschi, A. Gallo, P. Gauzzi, A. Ghigo, P. Gianotti, S. Giovannella, C. Guaraldo, D. Hampai, M. Iliescu, G. Lamanna, G. Lanfranchi, A. Liedl, C. Ligi, M. P. Lombardo, V. Lucherini, P. Levi Sandri, A. Marcelli, M. Martini, M. Mascolo M. Mastrucci, F. Micciulla, M. Mirazita, S. Miscetti, G. Morello, D. Moricciani, V. Muccifora, F. Murtas, E. Nardi, S. Okada, E. Pace, M. Pallavicini, M. Palutan, A. Paoloni, A. Passeri, L. Pellegrino, D. Piccolo, K. Piscicchia,C. Polese, M. Poli Lener, L. Porcelli, G. Raffone, M. Raggi, R. Ricci, U. Rotundo, L. Sabbatini, P. Santangelo, I. Sarra, G. Saviano, E. Sbardella, B. Sciascia, A. Scordo, H. Shi, D. L. Sirghi, F. Sirghi, T. Spadaro, B. Spataro, E. Spiriti, A. Stecchi, S. Tomassini, C. Vaccarezza, P. Valente, A. Variola, G. Venanzoni, F. Villa, J. Zmeskal, M. Zobov | The Frascati National Laboratories (LNF) are the oldest and largest research infrastructure of INFN, mainly devoted to the research in nuclear and particle physics, to the development of particle accelerators and frontier studies on new acceleration techniques. LNF is the place where the first electron-positron collisions were obtained in the early 60s. Presently LNF operates two accelerator complexes: DAFNE, an e+e- collider with center of mass energy set to the mass of the φ meson, 1020 MeV. SPARC, a high intensity photoinjector capable of delivering electron beams up to 200 MeV, combined with a high power laser (FLAME), able to produce ultra short pulses, in the so called SPARC_LAB facility. The laboratory hosts also the NAUTILUS gravitational waves resonant bar detector, and thanks to the availability of several infrastructures, workshops, clean rooms etc.., it is also widely used as a facility for constructing large particle detectors used in other laboratories. The purpose of the present document is to address the question: is there a viable program on the development of internal activities which can allow the Laboratory to maximally exploit its capabilities and to maintain its role at the forefront of scientific research in the next decade? In particular, given the present Italian financial situation, is this possible by wisely upgrading the presently running infrastructures at moderate costs? On November 10-11, 2014 a workshop was held at LNF with the aim to discuss the above issues, with a broad participation of researchers from Italian and foreign institutions. A second workshop dedicated to the applications of the existing facilities to Materials Science was held on February 26-27, 2015. This document tries to summarize the main conclusions of these discussions. |
| 5361 | 2015-04-28 | Sulla Pedagogia/Didattica della Matematica | 2015 | INFN-DIV-15-2-LNF.pdf | C. Lo Surdo | |
| 5360 | 2015-04-07 | VIP Data Analysis Report | 2015 | INFN-15-04-LNF.pdf | D. Pietreanu,L. Sperandio | In this report the data analyses for the VIP experiment, which took data at the LNGS-INFN laboratory in the period 2006-2010, is presented in detail, together with the final result on the limit of the Pauli Exclusion Principle (PEP) probability for electrons. The data analysis is performed by using the ROOT software, in the first part without the refined charge transport correction, while in the second part with an optimized procedure for the charge transport correction for the Charged-Coupled Devices (CCDs). After introducing the structure of the data files, the cuts made to get the files available for the refined analysis are described. All the steps to obtain the final histograms and the fit results are presented in detail, together with the calculations for the identification of the region of interest and of the limit for the PEP violation probability. |
| 5359 | 2015-04-03 | Tests of the HEPD device at the SPARC-LAB facility | 2015 | INFN-15-03-LNF.pdf | Riccardo Pompili, Enrica Chiadroni, Cinzia De Donato, Massimo Ferrario, Giuseppe Masciantonio, Bruno Spataro | We reported here simulation studies performed with the GPT code on the beam dynamics of the SPARCLAB photoinjector. These studies are finalized to test an High Energy Particle Detector (HEPD) having the aim to identify the type of particle (proton, electron, ion) and the direction in order to be able to establish the angle between the trajectory of the particle and the Earth's magnetic field (pitch angle). The measurement of the incident particle direction is essential to understand the spatial correlation between the earthquake and detection sites. Good angular resolution is expected to play a key role for the understanding of the physics responsible for the phenomena. The data reported in this note foresees the use of the high brightness electron beam produced at SPARCLAB with energies in the range between 5 and 100 MeV. |
| 5358 | 2015-03-24 | Il sistema di controllo periferiche per il portale INFN-ANN dell'esperimento SCINTILLA | 2015 | INFN-15-02-GE.pdf | R. De Vita, E. Fanchini, G. Firpo, A. Manco, G. Ottonello, F. Parodi, F. Pratolongo, V. Vigo | Questa nota descrive il sistema di controllo periferiche utilizzato dal Radiation Portal Monitor (RPM) sviluppato nell’ambito del progetto europeo SCINTILLA per la rivelazione di radiazioni nel monitoraggio di autoveicoli e container da trasporto. |
| 5357 | 2015-03-16 | Misure di Raggi Cosmici a Orvieto con i Laboratori Nazionali di Frascati | 2015 | INFN-DIV-15-1-LNF.pdf | L. Battistelli, S. Belcapo, F. Esposito, L. Ghezzi, D. Sensi, M. Anelli, C. Gatti | Questa relazione è stata scritta da un gruppo di studenti che hanno partecipato ad uno stage organizzato presso il Liceo Ettore Majorana di Orvieto nel Dicembre 2014. Lo stage, inserito in una serie di iniziative organizzate da Giuseppe De Ninno e Adele Riccetti in occasione di 'Orvieto Scienza 2015', voleva avvicinare questo gruppo di studenti al mondo della fisica delle particelle elementari con una attività sperimentale e didattica. Contattati tramite Pasquale Di Nezza, coordinatore di 'Scienza Per Tutti', abbiamo proposto un percorso di scoperta degli sciami cosmici ispirato all'articolo di Pierre Auger 'Extensive Cosmic- Ray Showers' pubblicato sulla Review of Modern Physics Vol. 11 del 1939. In questo articolo di sole 4 pagine Auger, dotato di pochi contatori Geiger-Muller e di una incredibile intuizione, riesce a determinare le proprietà dei raggi cosmici primari e degli sciami da essi prodotti. Per svolgere l'attività sperimentale abbiamo allestito un piccolo apparato con alcuni rivelatori a scintillatore e un'opportuna elettronica per elaborare i segnali. Quindi, nell'arco di un pomeriggio, una notte di presa dati ed una mattina, abbiamo in parte ripercorso il ragionamento e le misure di Auger fino a stimare quanti raggi cosmici primari e con quale energia colpiscono l'atmosfera e quante particelle e quale estensione ha lo sciame prodotto. Pensiamo che la miglior testimonianza della riuscita di questa esperienza venga dalle parole di uno dei ragazzi che hanno passato molte ore a raccogliere dati, fare conti e ragionamenti: «A parte la suggestione che un esperimento come questo può esercitare su uno studente del Liceo, mi ha colpito in particolare come un argomento così complesso possa essere stato affrontato da noi in modo relativamente semplice». (M. Anelli, C. Gatti) |
| 5356 | 2015-03-11 | A novel fast timing micropattern gaseous detector: FTM | 2015 | INFN-15-01-BA.pdf | R. De Oliveira, A. Sharma, M. Maggi | In recent years important progress in micropattern gaseous detectors has been achieved in the use of resistive material to build compact spark-protected devices. The novel idea presented here consists of the polarisation of WELL structures using only resistive electrodes. This allows a new device to be built with an architecture based on a stack of several coupled layers where drift and WELL multiplication stages alternate in the structure. The signals from each multiplication stage can be read out from any external readout boards through the capacitive couplings. Each layer provides a signal with a gain of $10^{4},-,10^{5}$. The main advantage of this new device is the dramatic improvement of the timing provided by the competition of the ionisation processes in the different drift regions, which can be exploited for fast timing at the high luminosity accelerators (e.g. HL-LHC upgrade) as well as applications outside particle physics. |
| 5355 | 2014-12-18 | CLB Test Report | 2014 | INFN-14-21-GE.pdf | A. Orzelli, V. Kulikovskiy, P. Musico, M. Cresta, C. Hugon, F. Pratolongo, L. Wiggers, P. Jansweijer, J.W. Scmelling, D. Real, D. Calvo, S. Biagi, R. Travaglini, G. Pellegrini | In this note we describe all tests performed on the Central Logic Board (CLB). The CLB is designed to manage slow control instrumentations and PMT data for each Digital Optical Module (DOM). |
| 5353 | 2014-12-16 | Job Packing: Optimized Configuration for Job Scheduling | 2014 | INFN-14-19-CCR.pdf | S. Dal Pra | The default behaviour of a batch system is to dispatch jobs to nodes having the lower value of some load index. Whilst this causes jobs to be equally distributed among all the nodes in the farm, there are cases when different types of behaviour may be desirable, such as having a completely full node before dispatching jobs to another one, or having similar jobs dispatched to nodes already running jobs of the same kind. This work defines the packing concept, different packing policies and useful metrics to evaluate how good the policy is. A simple farm simulator has been written to evaluate the expected impact on a farm of different packing policy. The simulator is run against a sequence of real jobs, whose parameters have been taken from the accounting database of INFN-°©‐Tier1. The effectiveness of two packing policies of interest, namely relaxed and exclusive, are compared. The exclusive policy proves to be better, at the cost of unused cores in the farm, whose number is estimated. The possibility of implementing the exclusive policy on a specific batch system, LSF 7.06, is exploited. Relevant configurations are shown and an overall description of the mechanism is presented. |
| 5354 | 2014-12-16 | The Electronic Design and the Layout of Central Logic Board (CLB) for the KM3NET Experiment | 2014 | INFN-14-20-GE.pdf | M. Anghinolfi, M. Cresta, C. Hugon, V. Kulikovskiy, P. Musico, A. Orzelli, F. Pratolongo | In this note we describe the design and construction of Central Logic Board (CLB) for the KM3NeT experiment. This board is inserted into the Digital Optical Module (DOM). The CLB is designed to manage slow control instrumentations and PMT data for each DOM. An optical connection is used to receive commands and send all the data to the On Shore station. |
| 5351 | 2014-12-10 | Aspetti di Sicurezza nella Programmazione di Siti WEB in Ambiente Accademico | 2014 | INFN-14-17-CCR.pdf | M. Michelotto, D. Vettore | L’obiettivo di questa guida è fornire un supporto a chi deve gestire un server web in ambito accademico e deve sviluppare codice per il server web. Dopo aver installato un server web è importante anche mettere in sicurezza il codice per evitare attacchi da malintenzionati. |
| 5352 | 2014-12-10 | Aspetti di Sicurezza nella Gestione di Siti WEB in Ambiente Accademico | 2014 | INFN-14-18-CCR.pdf | M. Michelotto, D. Vettore | L’obiettivo di questa guida è fornire un supporto da un punto di vista sistemistico per la configurazione di Web Server in ambito accademico Si intende seguire l’amministratore nella configurazione e installazione offrendogli dei consigli nel caso in cui ci possano essere dubbi ed evidenziando i punti più critici |
| 5350 | 2014-11-26 | Hybrid Scheme of Positron Source at SPARC_Lab LNF Facility: Channeling Radiation and Amorphous Photon Converter | 2014 | INFN-14-16-LNF.pdf | S.V. Abdrashitov, O.V. Bogdanov, S.B. Dabagov, Yu.L.Pivovarov, T.A.Tukhfatullin | The hybrid scheme of the positron source for SPARC_LAB LNF facility (Frascati, Italy) is proposed. The comparison of the positron yield in a thin amorphous W converter of 0.1 mm thickness produced by bremsstrahlung, by axial <100> and planar (110) channeling radiations in a W crystal is performed for the positron energy range of 1 3 MeV. It is shown that channeling radiation by 200 MeV electrons (parameters of SPARC LNF Frascati) in a 10 µm W crystal can produce positrons in the radiator of 0.1 mm thickness with the rate of 10–102 s-1 at planar channeling and of 103–104 s-1 at axial channeling. |
| 5349 | 2014-11-19 | !CHAOS: a cloud of controls – MIUR project proposal | 2014 | INFN-14-15-LNF.pdf | F. Antonucci, C. Bisegni, M. Caberletti, M. Castellano, L. Catani, B. Checcucci, R. Centioni, P. Ciuffetti, G. Di Pirro, L. G. Foggetta, F. Galletti, R. Gargana, P. Lubrano, A. Mandelli, M. Mara, G. Mazzitelli, A. Michelotti, M. Michelotto, R. Orrù, M. Piccini, S. Pulvirenti, A. Stecchi, S. Tomassini, G. Salina, F. Spagnoli, P. Veronesi, L. Vigliano, M. Zagaroli, G. Zizzi | This note presents a synthesis of “!CHAOS: a cloud of controls” proposal submitted to MIUR as Premiale 2012. The aim of this document is to underline the evolution of the !CHAOS project from a candidate of control systems (CS) for the SuperB accelerator to a prototype of Information Technology (IT) distributed infrastructure, to be dedicated not only to accelerators and large high energy physics (HEP) experiments, but also to the society as a whole and to the industries. In this framework, !CHAOS may potentially become an INFN product, a spinoff, a center of competencies coming from HEP. Participant laboratories, Institutions and companies have currently undergone several changes with respect to the present document and part of the choices here described have been modified due to the reduction of the budget, the large delay in the delivery of the support and the reduction of personnel since the proposal idea. |
| 5347 | 2014-11-12 | Properties of potential eco-friendly gas replacements for particle detectors | 2014 | INFN-14-13-LNF.pdf | L. Benussi et al. | Modern gas detectors for detection of particles require F-based gases for optimal performance. Recent regulations demand the use of environmentally unfriendly F-based gases to be limited or banned. This review studies properties of potential eco-friendly gas candidate replacements. |
| 5348 | 2014-11-12 | A study of HFO-1234ze (1,3,3,3-Tetrafluoropropene) as an eco-friendly replacement in RPC detectors | 2014 | INFN-14-14-LNF.pdf | L. Benussi et al. | Modern gas detectors for detection of particles require F-based gases for optimal performance. Recentregulations demand the use of environmentally unfriendly F-based gases to be limited or banned. This report shows results of studies on performance of RPCs operated with a potential eco-friendly gas candidate 1,3,3,3-Tetrafluoropropene, commercially known as HFO-1234ze. |
| 5346 | 2014-09-01 | Il Plasma di Quark e Gluoni e la Fisica con Ioni Pesanti ad ATLAS | 2014 | INFN-DIV-14-02-LNF.pdf | C. Gatti | In questo articolo si da una breve introduzione divulgativa sulla fisica del plasma di quark e gluoni. Viene poi spiegato come è prodotto questo stato della materia mediante l'urto tra ioni pesanti. Infine, vengono discussi alcuni dei risultati più rilevanti dell'esperimento ATLAS. |
| 5345 | 2014-05-29 | PORFIDO on the NEMO phase 2 and KM3 phase 1 towers | 2014 | INFN-14-12-LNF.pdf | O. Ciaffoni, M. Cordelli, R. Habel, A. Martini, L. Trasatti | PORFIDO (Physical Oceanography by RFID Outreach) is an underwater measurement system designed to gather oceanographic data from the Optical Modules of a neutrino telescope with a minimum of disturbance to the main installation. PORFIDO is composed of a sensor glued to the outside of an Optical Module, in contact with seawater, and of a Reader placed inside the sphere, facing the sensor. Data are transmitted to the reader through the glass by RFID and to shore in real time for periods of years. The sensor gathers power from the radio frequency, thus eliminating the need for batteries or connectors through the glass. We have deployed four PORFIDO probes measuring temperatures with the NEMO Phase 2 tower in march 2013. After more than one year all probes are operative and are transmitting temperature data from 3500 m depth. In the fall of 2014 we will deploy with the first KM3 Phase 1 towers an improved version of PORFIDO with a resolution of 0.5E-3 ˚C. |
| 5344 | 2014-05-07 | Review del Tier-2 di ATLAS dei Laboratori Nazionali di Frascati | 2014 | INFN-14-11-LNF.pdf | E. Vilucchi, M. Antonelli, C. Gatti, R. Di Nardo, U. Dosselli, M. Pistoni, R. Ricci, U. Rotundo, M. Testa | In questo documento viene presentato il Tier-2 di ATLAS dei LNF in tutti i sui aspetti. Dopo la presentazione dell'infrastruttura ospitante (sala calcolo, impianto elettrico e di raffreddamento), si ripercorrono tutte le attività degli ultimi anni che hanno coinvolto la farm, il personale del gruppo locale di ATLAS ed i servizi dei LNF: attività di analisi, sinergie con gli altri gruppi e divisioni dei Laboratori e sinergie sviluppate con altri siti dell'INFN e con strutture al di fuori dell'INFN. |
| 5343 | 2014-05-05 | Direct measurment of antares detector angular resolution with moon shadow effect | 2014 | INFN-14-10-GE.pdf | M. Sanguineti, C. Distefano, V. Kulikovskiy, H. Costantini, C. Hugon | The cosmic ray Moon shadow analysis is a unique method to test the pointing performance of a neutrino telescope, like the ANTARES detector. In this article the 2007-2012 data sample is analysed and a 3.06 σ significance of Moon shadow effect is found. For this analysis a dedicated Monte Carlo simulation has been produced and an opportune test statistic function has been defined. This is the first direct measurement of the angular resolution of the ANTARES detector (0.7°±0.2°). |
| 5342 | 2014-04-28 | Progetto della nuova facility di irraggiamento al CNAO | 2014 | INFN-14-09-LNF.pdf | M. Pullia, C. Sanelli,S. Alpegiani, G. Battistoni, G. Bazzano, L. Bellan, A. Bertola, E. Bollito, J. Bosser, E. Bressi, G. Butella, L. Casalegno, L. Celona, G. Ciavola, M. Ciocca, P. Cirrone, A. Clozza, M. Del Franco, E. Di Pasquale, M. Donetti, A. Facoetti, L. Falbo, R. Ferrari, M. Ferrarini, S. Foglio, L. Frosini, A. Galatà, G. Gallo, S. Gammino, F. Generani, F. Gerardi, A. Ghigo, S. Gioia, S. Giordanengo, V. Lante, A. Lanza, L. Lanzavecchia, A. Mairani, D. Mascali, R. Monferrato, J. Moreno, M. Necchi, M. Nodari, A. Parravicini, L. Pellegrino, M. Pelliccioni, M. Pezzetta, C. Priano, E. Rojatti, S. Rossi, S. Savazzi, M. Scotti, G. Sensolini, M. Serio, S. Sironi, D. Sora, B. Tagaste, S. Toncelli, G. Venchi, V. Vercesi, B. Vischioni, S. Vitulli, C. Viviani | La Fondazione CNAO ha tra i suoi scopi anche lo svolgimento di attività di ricerca. Il centro CNAO è stato concepito sin dall’inizio con tre sale di trattamento, espandibili fino a cinque, ed una “sala sperimentale” nella quale le attività di ricerca possano venire svolte senza intralciare e senza essere intralciate dalla attività clinica.Tale sala sperimentale deve essere progettata per essere “multi-uso”, cioè tale da poter venire utilizzata per attività di ricerca nei campi più disparati e non specializzata in un tipo di attività particolare. Possibili argomenti di ricerca sono radiobiologia, sviluppo di monitor di fascio, sviluppo di dosimetri, studi di radiation hardness e molti altri ancora.Lo studio di tale facility ed in particolare lo studio degli aspetti tecnici legati all’ampliamento del complesso dell’acceleratore è stato portato avanti congiuntamente da CNAO e INFN, nell’ambito dell’accordo quadro approvato nel 2009 e del nuovo accordo quadro stipulato nel 2013. Per meglio identificare le necessità dei possibili utenti è stato svolto un sondaggio i cui risultati sono stati considerati nella definizione delle specifiche funzionali della linea e della sala sperimentale. Tale sondaggio è illustrato più avanti in questo documento. In questo documento viene descritto il progetto della sala sperimentale e delle linee di alta e di bassa energie coinvolte. Nella prima parte del documento viene data una descrizione generale del progetto, mentre i dettagli sono generalmente riportati nelle appendici e nei documenti allegati. |
| 5341 | 2014-04-23 | Il fenomeno della superconduttività | 2014 | INFN-DIV-14-01-LNF.pdf | D. Di Gioacchino | In questa nota divulgativa sono presentate le proprietà fenomenologiche della fase superconduttrice quali la resistenza elettrica nulla, l’espulsione del campo magnetico o effetto ‘Meissner’, il concetto di campo magnetico critico e supercorrente critica, gli ordini di grandezza delle variabili fisiche coinvolte puntualizzando le tappe storiche della superconduttività. Si mostra il differente comportamento fra un superconduttore e un conduttore perfetto e sono introdotte le due classi di materiali superconduttori e le differenti strutture cristalline. Inoltre si accenna cosa è un quanto di flusso magnetico, le conseguenze dovute alla quantizzazione del campo magnetico in un superconduttore. Brevemente si presenta la speculazione che delinea i fondamenti microscopici del fenomeno superconduttivo: la teoria ‘BCS’ e il concetto della formazione delle coppie di ‘Cooper’. Infine è accennata la descrizione della transizione di fase da uno stato normale a quello superconduttore come “rottura spontanea della simmetria”, concetto elegante e potente usato in modo generale per la comprensione di molteplici fenomeni fisici |
| 5339 | 2014-04-01 | DAFNE Gamma-Rays Factory | 2014 | INFN-14-07-LNF.pdf | D. Alesini, I. Chaikovska, A. Variola, S. Guiducci, F. Zomer, C. Milardi, M. Zobov | Gamma sources with high flux and spectral densities are the main requirements for new nuclear physics experiments to be performed in several worldwide laboratories and envisaged in the ELI-NP (Extreme Light Infrastructure-Nuclear Physics) project or in the IRIDE (Interdisciplinary Research Infrastructure with Dual Electron Linacs) proposals. The paper is focalized on an experiment of gamma photons production using Compton collisions between the DAFNE electron beam and a high average power laser pulse, amplified in a Fabry-Pérot optical resonator. The calculations show that the resulting gamma beam source has extremely interesting properties in terms of spectral density, energy spread and gamma flux comparable (and even better) with the last generation gamma sources. The energy of the gamma beam depends on the adopted laser wavelength and can be tuned changing the energy of the electron ring. In particular we have analyzed the case of a gamma factory tunable in the 2-9 MeV range. The main parameters of this new facility are presented and the perturbation on the transverse and longitudinal electron beam dynamics is discussed. A preliminary accelerator layout to allow experiments with the gamma beam is presented with a first design of the accelerator optics. |
| 5340 | 2014-04-01 | Electrons diffusion and signal noise contributions on electron clusters detection efficiency | 2014 | INFN-14-08-LNF.pdf | M. Beretta, C. Gatti, G. Felici, G. Finocchiaro | The Cluster Counting (CC) technique, proposed for dE/dx measurements with the SuperB drift-chamber, could, significantly, improve particle identification by avoiding the fluctuations involved in charge measurements. As the technique is quite sensitive to the detector working conditions and to the front-end chain response, in this note we have investigated the effects on clusters detection efficiency of electron diffusion, preamplifier frequencyresponse and Signal-to-Noise Ratio (SNR) using different algorithms. The evaluation is based on Garfield datasets, generated for a single cell geometry, at different impact points for π/µ/e particles with momenta 120, 140, 160, 180 and 210 MeV. The current waveforms generated by Garfield have been shaped according to the preamplifier response and different amounts of white gaussian noise has been added to the waveforms to simulate different SNRs. Finally an estimation of π/µ/e separation is shown. |
| 5337 | 2014-03-25 | Deflection of Proton Beams by Crystal Miscut Surface | 2014 | INFN-14-05-LNF.pdf | A.A. Babaev, S.B. Dabagov | The theory of beam deflection by the terrace crystal field forming the miscut surface was developed. The phenomenology of proton channeling and quasichanneling has been applied to describe new features of the beam deflection. The computer experiment results on proton beam deflection by the crystal miscut surface are presented. The analysis predicts efficient beam deflection by the acute crystal end due to repelling miscut potential. |
| 5338 | 2014-03-25 | Possible upgrades of the DAFNE Beam-Test Facility (BTF) | 2014 | INFN-14-06-LNF.pdf | P. Valente, B. Buonomo, L. Foggetta | The BTF (Beam-Test Facility) is a transfer line using the electron or positron beam of the DAΦNE LINAC. The particle beams can be attenuated, energy-selected and collimated for a wide range of energy and intensity. The beam parameters can be tuned to match the needs of each users, mainly in the field of HEP detector testing, but also dedicated studies of electromagnetic interaction. The BTF has been operational for more than 10 years, mainly in “parasitic” mode to the operation of the DAΦNE collider, delivering beams for an average of more than 220 days/year. The potential of the BTF facility can be further enlarged following different lines of development, which are briefly discussed in this paper: improvement of the environmental shielding for high-intensity applications; extension of the beam bunch time-width; addition of new collimators to reduce beams divergence and background at low intensity; doubling of the beam extraction system and transport line; improvement of the tagged photon source; increase of the maximum energy from 750/550 MeV (for electrons/positrons) to about 1 GeV/750 MeV respectively; improvement of a neutron line using the photo-production target; improvement of the beam diagnostics, mainly based on particle detectors, and the develop of a new BTF sub-system controls. |
| 5336 | 2014-03-13 | Proposal to search for a dark photon in e+ on target collisions at DAFNE linac | 2014 | INFN-14-04-LNF.pdf | M. Raggi, V. Kozhuharov | Photon-like particles are predicted in many extensions of the Standard Model. They have interactions similar to the photon, are vector bosons, and can be produced together with photons. The present paper proposes a search for such particles in the e+e- → Uγ process in a positron-on-target experiment, exploiting the positron beam of the DAΦNE LINAC at the Laboratori Nazionali di Frascati, INFN. With a 550 MeV/c beam and 104 positrons per bunch in one year of running a sensitivity in the relative coupling constant down to 10-6 is achievable, in the mass region from 2.5 MeV < MU < 20 MeV, compatible with the preferred region from the 3σ discrepancy in gμ -2.The proposed experimental setup and the analysis technique is discussed. |
| 5335 | 2014-02-18 | The NORCIA Experiment | 2014 | INFN-14-03-LNF.pdf | D. Di Gioacchino, G. Gatti, A. Marcelli, B. Spataro, V. Dolgashev, S.G. Tantawi, A.D. Yeremian, J. Rosenzweig | A high gradient X band accelerating structure has been fabricated with the electroforming process . Low level RF measurements are in perfect agreement with the design predictions. A promising proposal in order to get a irises cooling is described, too. The high power RF tests are in progress at SLAC. |
| 5334 | 2014-02-11 | Accounting Data Recovery. A Case Report from INFN-T1 | 2014 | INFN-14-02-CNAF.pdf | S. Dal Pra | Starting from summer 2013, the amount of computational activity of the INFN-T1 centre reported by the official accounting web portal of the EGI community accounting.egi.eu, was found to be much lower than the real value. Deep investigation on the accounting system pointed out a number of subtle concurrent causes, whose effects dated back from May and were responsible for a loss of collected data records over a period of about 130 days. The ordinary recovery method would have required about one hundred days. A different solution had thus to be designed and implemented. Applying it on the involved set of raw log files (records, for an average production rate of jobs/day) required less than 4 hours to reconstruct the Grid accounting records. The propagation of these records through the usual dataflow up to the EGI portal was then a matter of a few days. This report describes the work done at INFN–T1 to achieve the aforementioned result. The procedure was then adopted to solve a similar problem affecting another site, INFN–PISA. This solution suggests a possible alternative accounting model and provided us with a deep insight on the most subtle aspects of this delicate subject. |
| 5333 | 2014-01-15 | Integrazione Single Sign on su JASPERSERVER PER INFN AAI | 2014 | LNF-14-1(P).pdf | F. Serafini, M. Canaparo | Il presente documento descrive come implementare il Single Sign On tramite Shibboleth con JasperServer 4.5. Lo scopo di questa attività è stato di integrare nel servizio di Business Intelligence dell’INFN, l’autenticazione gestita con AAI e il Single Sign On in modo tale da rendere questo servizio accessibile con le stesse modalità degli altri offerti da INFN. |
| 5332 | 2013-12-17 | Per se definition of Dirac's Delta funcion | 2013 | INFN-13-23-LNF.pdf | M. Pallotta | We examine critically the various de nitions of the Dirac's Delta, we note that we are constantly in the presence of a discontinuity at in nity which makes it impossible to give a correct de nition of the Dirac's Delta per se. Then we give its de nition per se according to the standards dictated by Dirac himself: it is a 'function' that is zero everywhere except at the zero point where it has an in nite value and is such that the integral from minus in nity to plus in nity is 1 and that also multiplied by a 'well-behaved function' it gives the value of the function at the point 0. Note also that if we accept the Cesàro summability we arrive quickly, also in this case, at a correct per se de nition of the Delta itself. We are then reasoning on the relationship between mathematics and physics. |
| 5328 | 2013-11-21 | Evaluation of the Anomalous X-Ray Energy in VIP Experiment | 2013 | INFN-13-19-LNF.pdf | S. Di Matteo, L. Sperandio | In this communication we analyze three possible decay channels of an eventual Pauli-principle-violating electron in a copper wire. The electron can reach the lowest 1s state either through a direct transition from Cu conduction band (K edge), or by a 2p (3p) capture, with a subsequent Kα (Kβ) emission. The energy of the produced x-ray depends on the path followed by the electron. Here we calculate the three different energy values and try to give a plausible estimate for the relative transition rates. |
| 5329 | 2013-11-21 | Evaluation of the anomalous X-ray energy in VIP experiment: some values from Dirac-Fock method | 2013 | INFN-13-20-LNF.pdf | S. Di Matteo, L. Sperandio | The goal of the VIP experiment was to improve the limit on the Pauli Exclusion Principle through the search of “anomalous” X-ray in copper atoms, produced by “fresh” electrons (introduced through electrical current that crosses our sample and thus “new” respect to the existing ones in the copper, that had already all the time to perform the allowed and “prohibited” transitions) which have the probability to do the Pauli-forbidden transition [1] [2]. Here we calculated the energy shift of the anomalous X-ray for three possible decay channels: direct transition to 1s (K-edge) and 2p (3p) capture with a subsequent Kα (Kβ) emission [3]. Since we are considering a non-antisymmetrized electron then we can follow the case of a muonic atom. The reported values were obtained from Dirac-Fock calculations, as previously performed for a variety of muonic atoms by Mallow et al. [4]. Dirac-Fock approximation takes into account the relativistic corrections that are relevant for heavy ions, as we have considered our sample (ZCu = 29). Thanks to a numerical code it is possible to perform relativistic calculations for atoms, using the “multiconfiguration” approximation for the N-electron wave function. This scheme proceeds through the optimization of the parameters during a self-consistent process [5]. Muon and electron can be treated in analogous way through the self-consistent field theory, to obtain wave functions and energies. The most commonly used approximation to treat the Hamiltonian of an N-electron system is the so called “no pair” approximation that explicity excludes electron-positron pairs. The effects of the Breit operator, the Lamb shift and all sort of radiative corrections, as perturbations, are included. |
| 5330 | 2013-11-21 | Evaluation of the X-ray transition energies for the Pauli-Principle-violating atomic transitions in several elements by using the Dirac-Fock method | 2013 | INFN-13-21-LNF.pdf | C. Curceanu, L. De Paolis, S. Di Matteo, H. Elnaggar, L. Sperandio | In the light of the ongoing upgrade of the VIP experiment and of other possible similar experiments, in this paper we analyze the Pauli-principle-violating atomic transitions of an electron for a wide class of metal conductors (Cu, Au, Ag, Ge, Pb). We remind that a Pauli-principle-violating atomic transition is defined as a radiative transition towards a final state that is already fully occupied. Of course, such transitions should not normally take place, because of the Pauli principle and these experiments are conceived in order to detect the possible tiny violations of the Pauli principle. The aim of the present report is to provide the theoretical support to this class of experiments, by calculating the energy shifts that the emitted x-rays would undergo in the case of violation of the Pauli principle. We also provide an estimate for the relative transition rates, discuss the results and describe in some details the program used for the calculations. |
| 5331 | 2013-11-21 | Snowmass Report: Ideas for Muon Production from Positron Beam Interaction on a Plasma Target | 2013 | INFN-13-22-LNF.pdf | M. Antonelli, P. Raimondi | Muon beams are customary obtained via K/ decays produced in proton interaction on target. In this paper we will investigate the possibility to produce low emittance muon beams from electron positron collisions at centre-of-mass energy just above the μ+μ- production threshold with maximal beam energy asymmetry-i.e. a ~ 45 GeV positron beam interacting on an electron target . |
| 5326 | 2013-11-04 | The AC multi-harmonic magnetic susceptibility measurement setup at the LNF-INFN | 2013 | INFN-13-18-LNF.pdf | S. Wang, Z. Wu, A. Marcelli, D. Di Gioacchino | AC magnetic susceptibility measurement is a fundamental characterization tool in materials science, to study the dynamic magnetic response of magnetic materials and superconductors. An AC multi-harmonic magnetometer is available at the LAMPS laboratory of the LNF-INFN. The magnetometer allows performing experiments with an AC driving magnetic field with variable amplitude from 0.1 to 20 Gauss and in the frequency range from 17 to 2070 Hz. A DC magnetic field 0-8 T produced by a superconducting magnet can be applied, while data may be collected in the temperature range 4.2-300 K using a liquid He cryostat. The first seven AC magnetic multi-harmonic susceptibility components can be measured with a magnetic sensitivity of 1x10-6 emu and a temperature precision of 0.01 K. Here we will describe in detail the magnetometer, the instrumental control and the data acquisition framework. Special attention will be dedicated to the user-friendly LabVIEW-based software platform that allows running the experiments. |
| 5325 | 2013-10-22 | Misura della vita media del Muone | 2013 | INFN-DIV-13-02-LNF.pdf | M. Beretta, C. Bloise, M. Dreucci, C. Gatti, S. Martellotti | |
| 5324 | 2013-10-21 | Comparison of fast amplifiers for diamond detectors | 2013 | INFN-13-17-GE.pdf | M. Osipenko, S. Minutoli, P. Musico, M. Ripani, B. Caiffi, A. Balbi, G. Ottonello, S. Argirò, S. Beolè, N. Amapane, M. Masera, G. Mila | The development of Chemical Vapour Deposition (CVD) diamond detectors requests for novel signal amplifiers, capable to match the superb signal-to-noise ratio and timing response of these detectors. Existing amplifiers are still far away from this goal and are the dominant contributors to the overall system noise and the main source of degradation of the energy and timing resolution. We tested a number of commercial amplifiers designed for diamond detector readout to identify the best solution for a particular application. This application required a deposited energy threshold below 100 keV and timing resolution of the order of 200 ps at 200 keV. None of tested amplifiers satisfies these requirements. The best solution to such application found to be the Cividec C6 amplifier, which allows 100 keV minimal threshold, but its coincidence timing resolution at 200 keV is as large as 1.2 ns. |
| 5323 | 2013-10-08 | La scoperta del Bosone di Higgs: la versione di ATLAS | 2013 | INFN-DIV-13-01-LNF.pdf | C. Gatti | |
| 5322 | 2013-10-01 | Instruments and methods for XRF analysis of multilayer materials | 2013 | INFN-13-16-LNF.pdf | C. Polese, S. Dabagov, A.Esposito, M. Ferretti, A. Gorghinian, D. Hampai, A. Liedl | In this paper all the research activities carried out till now for the project of the PhD Course in ”Materials, Technologies and Complex Industrial Systems Engineering MATISE” (XXVIII cycle) on the development of XRF analysis for the characterization of multilayer objects of cultural interest are illustrated. This project is carried out within the frame of the collaboration between the laboratory XLab Frascati of Laboratori Nazionali di Frascati (INFN) and the Istituto Tecnologie Applicate ai Beni Culturali di Roma (CNR). |
| 5320 | 2013-09-11 | Piano per la Migrazione Sistemistica dell’Impianto di Contabilità INFN dalla release R11i a 32bit alla R12.1.3 64bit | 2013 | INFN-13-14-CNAF.pdf | C. Galli | Questo documento si propone di esporre, nel modo più semplice e lineare possibile, le scelte progettuali e le soluzioni tecniche che caratterizzano il percorso di Migrazione Sistemistica dell’attuale impianto tecnologico della Contabilità INFN, a partire dall’attuale versione 11i delle Oracle Applications1 verso la più recente release 12i. Il percorso intrapreso ha dimostrato diverse peculiarità, anche rispetto altre attività di migrazione simili nel panorama Italiano. Tali caratteristiche sono dovute soprattutto alla configurazione dell’attuale sistema contabile INFN, alla definizione dei requisiti tecnologici R12 necessari ed ai desiderata individuati sulla nuova release. Il path di migrazione coinvolge alcuni passi, come la conversione del Character Set del database o l’upgrade della versione di Java utilizzata nello stack tecnologico delle Applications, che pur non essendo strettamente necessari sono fortemente auspicabili sia dal punto di vista prestazionale che da quello della sicurezza. Purtroppo alcuni di questi passaggi introducono una serie di problematiche tecniche che hanno richiesto lavoro aggiuntivo per la loro risoluzione e che talvolta hanno implicato una ridefinizione successive del percorso stesso. Dato che i supporti ufficiali Oracle offrono una vasta quantità di documentazione, gran parte del lavoro è stato caratterizzato dalle verifiche sulla compatibilità tra guide e documenti. Oracle infatti aggiorna costantemente le sue Reference online, includendo le nuove patch per la risoluzione dei bug riscontrati. Tutto questo influenza notevolmente la corretta implementazione degli step di migrazione. |
| 5321 | 2013-09-11 | Disaster Recovery INFN: Configurazione di una soluzione High Availability con Oracle Data Guard 11g | 2013 | INFN-13-15-CNAF.pdf | C. Galli | Questo documento ha lo scopo di presentare in forma sintetica gli step necessari alla configurzione e realizzazione di un ambiente di High Availability con particolare riferimento ai contesti Oracle Database 11g così come verrà implementato nell’ambito del progetto di Disaster Recovery dell’INFN. Dopo una breve introduzione sulla soluzione tecnica adottata per la configurazione dell’ambiente H.A., ovvero Oracle Data Guard 11g, vengono presentati gli step necessari alle fasi di Setup iniziale, Avvio della replica (locale o geografica), Verifica, gestione di Faiver o Switchover e Monitoraggio. Nei rispettivi capitoli verranno inoltre presentate le eventuali differenze, rispetto al caso standard, che possono avere luogo in base alle diverse conformazioni degli ambienti di lavoro Primary e Standby. In ultimo nelle appendici vengono presentate anche alcuni consigli come ad esempio la configurazione di un canale sicuto TCPS/SSL per le connessioni tra Primary e Slave nel caso di un collegaemnto geografico su reti aperte. |
| 5319 | 2013-09-04 | Tau/Charm Factory Accelerator Report | 2013 | INFN-13-13-CLAB.pdf | M.E. Biagini, S. Bini, R. Boni, M. Boscolo, N. Carmignani, A. Chiarucci, R. Cimino, F. Cioeta, D. Cittadino, A. Clozza, M. D’Agostino, M. Del Franco, A. Delle Piane, E. Di Pasquale, A. Drago, G. Frascadore, S. Gazzana, R. Gargana, S. Guiducci, S. Incremona, C. Ligi, S. M. Liuzzo, G. Mazzitelli, A. Michelotti, E. Paoloni, R. Petronzio, M. Pivi, P. Raimondi, R. Ricci, L. Sabbatini, C. Sanelli, G. Schillaci, M. Sedita, M. Serio, A. Stella, S. Tomassini | The present Report concerns the current status of the Tau/Charm accelerator project and in particular discusses the issues related to the lattice design, to the accelerators systems and to the associated conventional facilities. The project aims at realizing a variable energy flavor factory between 1 and 4.6 GeV in the center of mass, and succeds to the SuperB project from which it heritates most of the solutions proposed in this document. The work comes from a cooperation involving the LNF accelerator experts, the young newcomers, mostly engineers, of the Cabibbo Lab consortium and key collaborators from external laboratories. The result of this effort is impressive, given the little time elapsed since SuperB cancellation, and is due to the enthusiasm of its contributors as well as to the deep and reusable work done for the parent project SuperB, showing the knowledge accumulated in accelerator physics at LNF. In the last section a possible time scale for the construction, as well as the financial load and the personnel requests, are preliminary outlined. Detector design and specific Physics channels to be studied by such an accelerator will be addressed in a separate document, ready by the end of September. The current work on these topics is concentrating in re-adapting the BaBar detector to a symmetric machine and to more stringent particle identification requirements. The physics case is robust and specific with a few discovery channels, but detector simulations are needed to assess the final potential of the experiment. A Tau/Charm Factory can provide multiple returns. An immediate economic one, related to the job opportunities of its construction and operation, and to the average presence on the territory of hundreds of physicists, engineers and technicians, most of them from an international community. The preparation to international tenders for its realization will make the Italian industries more competitive in future tenders of accelerator based infrastructures, including those related to medical physics or light sources. The attraction of young researcher abroad will generate a “brain catch” program. The project will strongly contribute to the HORIZON 2020 program of excellent science through the development of skills and talents. It will be an incubator of future emerging technologies, anticipated and tested in the High Energy Physics environment (electronics, engineering, web, computing). In particular, detector performances require the development of high technology in 3D electronics devices for the integration of sensors (particle trackers), today one of the major trends in the emerging industrial technologies. Sophisticated software codes are needed to simulate and treat the huge amount of data coming for the experiment, calling for a powerful computational network based on GRID technology. The novel control system developed for the accelerator can be exported to the industrial world. On the accelerator side, very low emittance rings, such as in Tau/Charm project, will generate skills useful in the development of future linear colliders Damping Rings. The capability for Italy to host an International laboratory, the Cabibbo Lab, may activate a co-funding process from European countries in a reciprocity scenario with respect to the Italian contributions to major European infrastructures. Besides a frontier particles detector and collider, the infrastructure aims to host a Free Electron Laser (FEL) facility with Angstrom class resolution, for state of the art material and biophysics studies, and a test area where extracted beam of various type will be available, ensuring to the facility a long exploitation time. As described briefly at the end of this document, key applications will then be made available for a wider scientific and industrial community. |
| 5318 | 2013-07-03 | Digital Hydrophone Signal Acquisition and Analysis for KM3NET | 2013 | INFN-13-12-GE.pdf | F. Ameli, M. Bonori, C. Calì, C. Hugon, V. Kulikovskiy, P. Litrico, A. Orzelli, G. Riccobene, F. Simeone, S. Viola, R. Masullo | The KM3NeT project foresees the utilization of hydrophones for various purposes such as positioning calibration, oceanographic measurements and possibly neutrino detection. Hydrophones will be connected to the Control Logic Board (CLB) inside Optical Modules, were incoming data will be acquired, packed and sent to the On-Shore station. It is planned to use hydrophones with a digital output, encoded with the AES3 protocol with a sample rate of 192 kHz and an amplitude resolution of the signal of 24 bits. This output is directly provided by the digital hydrophone, or by a digitizer in case of an analog one. The present document will report the result of the interfacing of a digital hydrophone to the Kintex 7 FPGA describing hardware and firmware; in case of the utilization of an analog hydrophone for the final design, there will probably be modifications in the hardware, while the firmware part can be the same in both cases. |
| 5316 | 2013-07-02 | Manifold Design of the GEM Detectors for a Uniform Gas Flow | 2013 | INFN-13-10-LNF.pdf | G. Raffone | A simple design solution of manifolds is suggested to get nearly uniform flow of the gas mixture inside the GEM chamber. Analytical expressions concerning the design of the piping system are derived and numerically checked by means of the ANSYS-FLOTRAN code v.13 [1]. A full gas flow CFD simulation of the trapezoidal detector is finally performed on the basis of the proposed formulae that should be thoroughly validated only by further experimental tests. |
| 5317 | 2013-07-02 | CHE and Related Stresses in GEM Foils | 2013 | INFN-13-11-LNF.pdf | G. Raffone | The “Coefficient of Hygroscopic Expansion” (herein α_CHE) of a GEM foil is simply computed assuming that the expansion is only due to the kapton layer that absorbs and retains the water vapor content of the moisture (or in general of any gas mixture) through the holes; that expansion is highly constrained by the copper layers and the resulting compressive (in kapton) and tensile (in copper) stresses can be easily estimated assuming that no other external loads are applied. It will be shown that the α_(CHE-GEM) in a GEM foil (2x5 + 50 micron) is 0.135 times lower than the α_(CHE-kapton) of the single kapton foil; then the effect of the Relative Humidity (herein RH) on the sag of the GEM foils is substantially negligible if the “kapton-free-to-expand” areas are small. |
| 5315 | 2013-07-01 | Test for the Measurement of Diffusion Coefficient of Water in Kapton Foils for the Gem Detector of the Upgraded High-Pseudorapidity Muon Detection in CMS | 2013 | INFN-13-09-LNF.pdf | A.V. Franchi, G. Saviano, M. Ferrini, M. Valente, L. Benussi, S. Bianco, D. Piccolo, G. Raffone | GEM detectors are the subject of careful studies and discussions within the CERN scientific community, with a view to their possible installation on several experiments of LHC, including CMS. These chambers consist of three layers microholes of Kapton (50 µm) sheets, Copper-cladded on both surfaces (5 µm per coat), spaced a few millimeters between them. A systematic study of the materials making up the detector is in progress in order to monitor the possible change of properties and behaviors of the chambers, as a result of interaction with process fluids and of radiations. This study is focused on the contact with ambient air and moisture, therefore we wanted to determine the value of the diffusion coefficient of water in the detector polyimide. The presence of this compound inside the detector sheets can determine a change of mechanical and electrical properties. The determination of the diffusion coefficient will allow then to describe, later, a model of adsorption and diffusion within the entire sheet geometry GEM, gaining concentration profiles and the time required to saturate the system. |
| 5312 | 2013-06-13 | About the Extraction of Beams with a Very Small Momentum Dispersion | 2013 | INFN-13-08-GE.pdf | M. Conte, A.U. Luccio | The properties of the m/4 nonlinear resonance are proposed as a tool for attaining beams with very small momentum dispersion and horizontal emittance. |
| 5311 | 2013-06-07 | Guida al ”Sistema di catalogazione e gestione delle Dotazioni Tecnologiche INFN per fini di Trasferimento Tecnologico” | 2013 | INFN-13-07-PG.pdf | B. Checcucci, F. Cantini | La presente relazione intende fornire una breve giuda comportamentale per l’uso di un database relazionale, sviluppato dal gruppo di lavoro presso la sezione INFN di Perugia, volto a fornire una mappatura delle risorse infrastrutturali dell’ente così come censite dai referenti T.T. nell’anno 2011. L’impianto si articola in due parti: • una dedicata alla consultazione dei dati raccolti (parte prima); • l' altra dedicata all’ inserimento, aggiornamento o cancellazione dei dati suddetti (parte seconda). Sia la consultazione non limitata che la modifica dei dati, richiedo l'effettuzione del login nel portale, all'indirizzo: http://www.pg.infn.it/cntt7 . |
| 5310 | 2013-05-22 | Technical Design Report of the Superconducting Dipole for fair SIS300 | 2013 | INFN-13-06-GE.pdf | F. Alessandria, S. Angius, G. Bellomo, P. Fabbricatore, S. Farinon, U. Gambardella, R. Marabotto, R. Musenich, R. Repetto, M. Sorbi and G. Volpini | This report deals with the design of the high field rapidly-cycling super-conducting dipoles needed for SIS300 synchrotron of the FAIR facility at GSI. The main results of the R&D activities, developed for supporting the design choices, are presented elsewhere. The characteristics of the dipole come from the requirement of the SIS300. The present lattice design includes 48 long dipoles with magnetic length 7.757 m and 12 short dipoles with magnetic length 3.879 m. The coils have two main features: they are curved (the corresponding sagitta is 112.8 mm for long dipoles), and they are fast ramped (for a superconducting magnet). Both these characteristics demanded a challenging R&D, aimed at the development of the required low loss conductor, a robust design with respect to fatigue issues and a suitable winding technology. The Italian National Institute of Nuclear Physics (INFN) performed this R&D. A project, called DISCORAP (“Dipoli SuperCOnduttori RApidamente Pulsati”), was developed in accordance with a specific INFN-FAIR Memorandum of Understanding signed by both institutions in December 2006. As output of this project a complete cold mass model of the short dipole was built and preliminary tested. The cold mass was integrated into a horizontal cryostat and presently activities are ongoing for testing the magnet at GSI cryogenic facilities. |
| 5309 | 2013-04-16 | Fifty years since the first European synchrotron radiation-derived XAFS spectrum (Frascati, 1963) | 2013 | INFN-13-05-LNF.pdf | A. Mottana, A. Marcelli | The first absorption spectra recorded in Europe using synchrotron radiation as the X-ray source were the K-edge of Al and the LIII-edge of Cu taken at Frascati electron synchrotron by the French-Italian group made of Y. Cauchois, C. Bonnelle and G. Missoni in April 1963. |
| 5308 | 2013-03-28 | International Linear Collider - Technical Design Report | 2013 | ILC Global Design Effort and World Wide Study | ||
| 5307 | 2013-03-25 | Radiation damage: evaluation of cosmic rays fluxes and high intensity radiation beams | 2013 | INFN-13-03-LNF.pdf | D. Di Gioacchino, G. Gatti, L. Ingrosso, A. Marcelli, B.V. Robouch, and B. Spataro | Cosmic rays causes concern about the lifetime and stability of materials exposed to these radiations and in particular about the life of humans involved in long term missions. Radiations interacting inside a bulk material generate along its track ionization, displacement of atoms through collisions, energy deposition, etc. Calculations to carefully evaluate these effects at low and high energies are important tools to be used in many applications. Indeed, materials and devices exposed to high intensity radiation beams present inside accelerator buildings may experience similar and even higher irradiation phenomena. We will present and discuss here some calculations of the dose absorbed by reference materials exposed to cosmic radiations. The same tools can be used to evaluate many other phenomena associated to the exposition of intense charged and neutral beams. |
| 5306 | 2013-03-20 | Analisi Preliminare sull'Evoluzione del Sistema di Mailing dell'INFN | 2013 | INFN-13-02-CCR.pdf | R. Veraldi, A. Brunengo, A. Gianoli, M. Michelotto, M. Serra, A. Tirel | Questo documento fotografa l’attuale situazione del servizio di posta elettronica presente nelle sedi INFN e analizza dei possibili nuovi scenari che possano ottimizzare l’utilizzo delle risorse, sia in termini di hardware impiegato sia per il numero di addetti (FTE). |
| 5314 | 2013-02-20 | SuperB Detector Technical Design Report | 2013 | INFN-13-01-PI.pdf | SuperB Collaboration (F. Forti et al.) | In this Technical Design Report (TDR) we describe the SuperB detector to be installed on the SuperB e+e- high luminosity collider. The SuperB asymmetric collider, foreseen to be constructed on the Tor Vergata campus near the INFN Frascati National Laboratory, is designed to operate both at the Υ(4S) energy in the center of mass with a luminosity of 1036 cm-2s-1 and at the τ/charm production threshold with a luminosity of 1035 cm-2s-1. This high luminosity, producing a data sample about a factor 100 larger than present B Factories would allow investigation of new physics effects in rare decays, CP Violation and Lepton Flavour Violaion. This document details the detector design presented in the Conceptual Design Report (CDR) in 2007. The R&D and engineering studies perfomed to arrive at the full detector design are described, and an updated cost estimate is presented. |
| 5305 | 2012-12-22 | ECLOUD’12: Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effect | 2012 | R. Cimino, G. Rumolo, F. Zimmermann | This report contains the Proceedings of the Joint INFN-Frascati, INFN-Pisa, CERN-LER and EuCARD-AccNet Mini- Workshop on Electron-Cloud Effects, “ECLOUD12”, held at La Biodola, Isola d’Elba, from 5 to 9 June 2012. The ECLOUD12 workshop reviewed many recent electron-cloud (EC) observations at existing storage rings, EC predictions for future accelerators, electron-cloud studies at DAFNE, EC mitigation by clearing electrodes and graphite/carbon coatings, modeling of incoherent EC effects, self-consistent simulations, synergies with other communities like the Valencia Space Consortium and the European Space Agency. ECLOUD12 discussed new EC observations at existing machines including LHC, CesrTA, PETRA-3, J-PARC, and FNAL MI; latest experimental efforts to characterize the EC – including EC diagnostics, experimental techniques, mitigation techniques such as coating and conditioning, advanced chemical and physical analyses of various vacuumchamber surfaces, beam instabilities and emittance growth – ; the status of EC physics models and (new, more versatile and additional) simulation codes and their comparison with recently acquired experimental data; and the mitigation requirements and potential performance limitations imposed by the EC on upgraded and future machines, including HL-LHC, FAIR, ILC, Project-X, SuperB and SuperKEKB. A dedicated session addressed problems related to RF breakdown and multipacting for space applications. A number of open questions and future R&D needs were identified. | |
| 5304 | 2012-12-21 | Ottimizzazione Energetica Ottenibile dall'Ampliamento dei Parametri Termoigrometrici all'Interno del Centro di Calcolo TIER 1 | 2012 | INFN-12-25-CNAF.pdf | A. Mazza, G. Bortolotti, A. Ferraro, M. Onofri | Di fronte alla costante crescita del costo dell’energia elettrica è ormai una pratica indispensabile la scelta di tecniche e sistemi a basso consumo per il miglioramento dell’efficienza energetica dei centri di calcolo. In questi centri ad alto fabbisogno energetico il raffreddamento delle apparecchiature informatiche rappresenta mediamente il 30% del consumo complessivo di energia elettrica, pertanto assume un’importanza strategica comprendere quali siano le condizioni più favorevoli per minimizzarne i costi di esercizio. Gli studi condotti sul tema hanno evidenziato i maggiori rendimenti delle macchine frigorifere a fronte dell’aumento delle temperature di esercizio all’interno delle sale calcolo, tantoché gli stessi produttori di apparecchiature informatiche propongono macchine in grado di operare a temperature sempre più alte e intervalli di umidità relativa sempre più ampi. Nel presente documento si descrive lo studio effettuato per il centro di calcolo Tier 1, presso il CNAF dell’INFN a Bologna, finalizzato alla valutazione dell’impatto che deriva dall’aumento delle temperature di esercizio nella sala calcolo, sia in termini di risparmio energetico ed economico sia in termini di ridondanza e resilienza dell’impianto. Lo studio si conclude con la stima del risparmio di energia elettrica consumata per il raffreddamento a fronte dell’innalzamento della temperatura di setpoint dell’acqua refrigerata da 8.5 °C a 14 °C, risparmio che si calcola del 14% circa. |
| 5302 | 2012-12-18 | Measuring Propagation Speed of Coulomb Fields | 2012 | INFN-12-23-LNF.pdf | A. Calcaterra, R. de Sangro, G. Finocchiaro, P. Patteri, M. Piccolo, G. Pizzella | The problem of gravity propagation has been subject of discussion for quite a long time: Newton, Laplace and, in relatively more modern times, Eddington pointed out that, if gravity propagated with finite velocity, planets motion around the sun would become unstable due to a torque originating from time lag of the gravitational interactions. Such an odd behavior can be found also in electromagnetism, when one computes the propagation of the electric fields generated by a set of uniformly moving charges. As a matter of fact the Liénard-Weichert retarded potential leads to a formula indistinguishable from the one obtained assuming that the electric field propagates with infinite velocity. Feyman explanation for this apparent paradox was based on the fact that uniform motions last indefinitely. To verify such an explanation, we performed an experiment to measure the time/space evolution of the electric field generated by an uniformely moving electron beam. The results we obtain on such a finite lifetime kinematical state seem compatible with an electric field rigidly carried by the beam itself. |
| 5303 | 2012-12-18 | Beam dynamics studies and design of the LINAC-LER transfer line for the electron Injector of SuperB | 2012 | INFN-12-24-LNF.pdf | S. Guiducci, D. Pellegrini | The transfer line from the Linac to the Low Energy Ring (LER) for the latest layout of the SuperB project is a critical part of the injector. It must implement a total of 149_ small-radius bending in the horizontal plane, a vertical dogleg and a final vertical angle to match the tilt of the LER. Details of the design are explained in this note together with the beam dynamics studies and the estimation of the maximum acceptable energy error for an efficient injection. |
| 5301 | 2012-12-12 | Progresso e Pregiudizi nella Fisica dei Raggi Cosmici sino al 2006 | 2012 | INFN-12-22-PG.pdf | A. Codino | Si descrive in quale modo il complesso di teorie, modelli ed idee fondamentali sulla radiazione cosmica, il corpus theoreticum utilizzato per circa mezzo secolo, è stato demolito da recenti misure di alcuni esperimenti. Il conflitto tra dati sperimentali e previsioni del corpus theoreticum tradizionale attiene: (1) l’inesistenza dell’effetto GZK tra 5x1019 e 3x1020 eV; (2) l’inadeguatezza del meccanismo accelerativo diffusivo nei resti di supernova nella spiegazione del ginocchio; (3) la previsione errata della predetta teoria accelerativa della posizione in energia del secondo ginocchio dello spettro dei raggi cosmici; (4) l’ inadeguatezza del Modello a Fossa della radiazione cosmica extragalattica; (5) l’ assenza di una componente dominante extragalattica della radiazione cosmica ad energie inferiori a 5x1019 eV; (6) il fallimento generale dei Modelli a Scolo nello spiegare le proprietà dei raggi cosmici alle basse energie; (7) la previsione errata dell’ aumento dell’anisotropia della radiazione cosmica al crescere dell’ energia tra 1012 e 1017 eV ; (8) il disaccordo tra il rapporto di flusso misurato boro/carbonio e quello previsto nei Modelli a Scolo ad energie superiori a 50 GeV/u. Lo smantellamento dell’impianto teorico tradizionale della Fisica dei Raggi Cosmici è accompagnato dalla spiegazione qualitativa e quantitativa di alcune caratteristiche fondamentali dello spettro in energia dei raggi cosmici: il ginocchio, il secondo ginocchio, la caviglia e la composizione chimica della radiazione cosmica tra 1012 e 4x1019 eV. Questo progresso è stata conseguito dal 2006 con la Teoria degli Indici Costanti. |
| 5300 | 2012-12-03 | Server per Nodi di Calcolo | 2012 | INFN-12-21-PD.pdf | M. Michelotto, M. Serra, A. Brunengo | Questo documento descrive il panorama dei processori disponibili sul mercato per nodi di calcolo (Worker Node) nel 2010 e previsione per il 2011. Per i nodi di calcolo la metrica principale è HEP-SPEC06[1] e il rapporto Euro/HEP-SPEC06. Il documento è una versione ridotta di un documento redatto dagli stessi autori, su richiesta del Presidente della Commissione Calcolo e Reti come ausilio per i referee delle Commissioni Scientifiche Nazionali con analisi dei costi e stime per gli anni futuri. |
| 5299 | 2012-11-30 | SSH Authentication Using Grid Credentials | 2012 | INFN-12-20-TO.pdf | D. Berzano | SSH is one of the most widely used tools in Unix. Apart from opening remote shells, its most intriguing feature is the capability to tunnel TCP connections, providing for both a secure channel and an authentication mechanism for generic services lacking them. We will show how to setup a very simple infrastructure that temporarily authorizes users presenting valid X.509 credentials, and in particular Grid users, to use SSH by performing the authentication through HTTPS beforehand. We will also compare this method with tools that provide similar functionalities, such as GSI-Enabled OpenSSH. Finally, a brief description of PROOF on Demand for the LHC ALICE experiment is presented as a use case. |
| 5298 | 2012-11-26 | Fondamenti Matematici Della Fisica Macroscopica(un percorso geometrico), Parte III | 2012 | INFN-12-19-LNF.pdf | C. Lo Surdo | |
| 5297 | 2012-11-12 | Appunti di Relatività Ristretta e di Cinematica Relativistica | 2012 | INFN-12-18-LNF.pdf | M. Artioli, D. Babusci, G. Dattoli | |
| 5295 | 2012-10-03 | A Study of Materials Used for Muon Chambers at the CMS Experiment at the LHC: Interaction with Gas, New Materials and New Technologies for Detector Upgrade | 2012 | INFN-12-17(T)-LNF.pdf | S. Colafranceschi | This thesis lays its foundation in both technological and theoretical studies carried out between several aspects of applied engineering. There are several original contributions within the material science. The first is the detailed studies about the CMS RPC gas filters, which required an intense 3 years data-taking and ended up with a complete characterization of purifier materials. On top of this a stable ad − hoc setup (GGM) has been developed for the CMS Experiment in order to monitor the RPC muon chamber working point. Finally a complete new detector has been designed, build and tested using new technology and new electronics establishing the word’s record in size for this kind of detector, which is taken under consideration for the upgrade of the high-⌘ region of the CMS Experiment. |
| 5294 | 2012-09-19 | Test system for the General Interface Boards | 2012 | INFN-12-16-LNF.pdf | A. Balla, L. Iafolla | The GIB boards (General Interface Boards) and the dedicated crate were designed and realized by a team of the SEA (Servizio Elettronica e Automazione) group of the research division. The main task of these boards is to interface the front-end electronics (FE or transition boards) dedicated to different detectors of KLOE-2 experiment with the higher stages of the acquisition system. The GIBs are equipped with many types of interfaces: optical link, RS232, USB, Ethernet and a 184-pins connector for the crate; the link between the GIBs and the front-end boards is done through the backplane of the crate. About 90 boards were produced and some tests were necessary to discard the broken ones. The toughest is the test of the pins for the crate: so we developed a dedicated system and software in order to accomplish it in a fast and sure way. We wrote this note to show how this system works in the case of a future production of new GIB boards. |
| 5293 | 2012-09-10 | Active Radiation Shield for Space Exploration Missions | 2012 | INFN-12-15-PG.pdf | R. Battiston,W.J. Burger, V. Calvelli, R. Musenich, V. Choutko, V.I. Datskov, A. Della Torre, F. Venditti,C. Gargiulo, G. Laurenti, S. Lucidi, S. Harrison and R. Meinke | |
| 5292 | 2012-08-31 | A possible hard X-Ray FEL with the SuperB 6 GeV Electron Linac | 2012 | INFN-12-14-LNF.pdf | D. Alesini, M. P. Anania, P. Antici, D. Babusci, A. Bacci, A. Balerna, R. Bartolini, M. Bellaveglia, M. Benfatto, R. Boni, R. Bonifacio, M. Boscolo, B. Buonomo, M. Castellano, L. Catani, M. Cestelli-Guidi, A. Cianchi, R. Cimino, E. Chiadroni, S. Dabagov, A. Gallo, D. Di Gioacchino, D. Di Giovenale, G. Di Pirro, A. Drago, A. Esposito, M. Ferrario, F. Ferroni, M. Gambaccini, G. Gatti, S. Guiducci, R. Gunnella, S. Ivashyn, S. Lupi, A. Marcelli, M. Mattioli, G. Mazzitelli, A. Mostacci, M. Migliorati, E. Pace, A. Perrone, V. Petrillo, R. Pompili, C. Ronsivalle, J. B. Rosenzweig, A. R. Rossi, W. Scandale, L. Serafini, O. Shekhovt, B. Spataro, C. Vaccarezza, A. Vacchi, A. Variola, G. Venanzoni, F. Villa. | The possibility to drive a SASE X-ray FEL using the 6 GeV electron linac foreseen by the SuperB project has been recently considered. In this paper a preliminary design study based on FEL scaling laws supported by HOMDYN and GENESIS simulations is presented. The goal of this work is to provide a preliminary design study of the FEL system, based on state of the art normal conducting technology, suitable to conduct a realistic evaluation of the additional costs required to drive an FEL user facility making use of the SuperB linac. |
| 5291 | 2012-08-03 | Phase contrast imaging opportunities at DAFNE | 2012 | INFN-12-13-LNF.pdf | Q. Hou, A. Marcelli | This document is a feasibility study for a x-ray phase contrast imaging beamline using the emission of a DAΦNE wiggler. Taking in consideration source flux, coherence and geometrical parameters we compared the main x-ray phase contrast imaging methods: the Zernike phase contrast with a transmission X-ray microscopy (TXM), a X-ray coherent diffraction imaging (CDI), a diffraction enhanced imaging (DEI) and a X-ray Talbot interferometry (XTI). Considering the DAΦNE parameters, the Talbot-Lau interferometry appears the most suitable layout matching the wiggler source. We present and discuss the optical system of this beamline based on a spherical grating monochromator and two focusing mirrors. |
| 5290 | 2012-08-01 | Fondamenti Matematici della Fisica Macroscopica (un percorso geometrico), Parte II | 2012 | INFN-12-12-LNF.pdf | C. Lo Surdo | |
| 5289 | 2012-07-13 | A study on sparking events in the data analysis of the ANTARES detector | 2012 | INFN-12-11-GE.pdf | M. Sanguineti, M. Anghinolfi, E. Davydova, V. Kulikovskiy | The ANTARES detector, completed in 2008, is the largest neutrino telescope in the Northern hemisphere. It is located at a depth of 2.5 km in the Mediterranean Sea, 40 km off the Toulon shore. The scientific scope of the experiment is very broad, being the search for astrophysical neutrinos as the main goal. In this note we analyse some events reconstructed with an anomalous high number of hits on PMTs. Likely these noise events are produced by light from electric discharge on PMT bases. We propose a method to distinguish these events from high-energy muon events. |
| 5288 | 2012-07-09 | Fondamenti Matematici della Fisica Macroscopica (un percorso geometrico), Parte I | 2012 | INFN-12-10-LNF.pdf | C. Lo Surdo | |
| 5286 | 2012-06-01 | Report on the development of the DisOpto board for the HET taggers of KLOE2 | 2012 | INFN-12-08-LNF.pdf | L. Iafolla, A. Balla, P. Ciambrone, M. Gatta, M. Mascolo, R. Messi | For the KLOE upgrade (KLOE-2) we built a new couple of subdetectors: the HETs, two position detectors for electrons and positrons dedicated to the study of the $\gamma\gamma$ physics. The developed Data AcQuisition (DAQ) system of these two detectors is fully compatible with the data acquisition and trigger systems of KLOE. The DAQ of the HETs transfers the data to the KLOE acquisition through a VME bus while the trigger systems are connected through lemo cables. The electrical ground of the two systems must not to be connected in order to reduce the noise effects. This led us to develop a decoupling board called DisOpto. |
| 5287 | 2012-06-01 | Studio di fattibilità di un TDC tollerante alle radiazioni per la camera a deriva di SuperB | 2012 | INFN-12-09-LNF.pdf | L. Iafolla, P. Ciambrone, G. Felici | Nell’ambito delle attività di sviluppo della camera a deriva dell’esperimento SuperB è stato fatto uno studio di fattibilità di un TDC con risoluzione dell’ordine del ns per le misure dei tempi di deriva degli elettroni. L’elettronica di front-end (di cui il TDC fa parte) verrà istallata nella piattaforma posizionata sopra al rivelatore per contenere la lunghezza dei cavi e non degradare eccessivamente il rapporto segnale/rumore: l’intero sistema deve quindi essere tollerante a una radiazione di background che al momento è stimata dell’ordine del kRad/anno. Fino a pochi anni fa i suddetti requisiti avrebbero portato alla realizzazione di un circuito dedicato (ASIC) con i conseguenti costi e tempi di sviluppo poiché i dispositivi FPGA disponibili erano o basati su SRAM, e quindi incompatibili con il background di radiazioni previsto, o non avevano le prestazioni sufficienti. Le più moderne ed efficienti FPGA prodotte dalla ACTEL e basate su memorie di tipo FLASH (e quindi più resistenti alla radiazione) hanno apportato una notevole semplificazione e riduzione di costi nello sviluppo di applicazioni che devono funzionare in presenza di moderate dosi di radiazione. In questo contesto lo studio di fattibilità del TDC, basato sulla tecnica ``4xOversampling” e implementata su ACTEL ProAsic3, ha dimostrato che è possibile implementare fino a 32 canali con relativo sistema di readout. Infine, per mitigare ulteriormente gli effetti causati dalla radiazione, è stata elaborata una innovativa logica decisionale che consente una notevole semplificazione nella realizzazione del circuito stampato. |
| 5285 | 2012-05-18 | TDC e sistema di acquisizione per il rivelatore HET di KLOE-2: Manuale utente | 2012 | INFN-12-07-LNF.pdf | L. Iafolla, A. Balla, M. Beretta, P. Ciambrone, F. Gonnella, M. Mascolo, R. Messi, D. Moricciani | L’upgrade di KLOE (KLOE-2) prevedeva l’installazione di un sistema di “tagging”, per lo studio della fisica gamma-gamma, costituito da 2 nuove coppie di rivelatori: HET e LET. Il sistema di acquisizione (DAQ) del rivelatore HET e' stato implementato su una scheda VME basata su una FPGA (Virtex-5). Esso consiste principalmente di un TDC, un sistema di elaborazione dati (Zero suppression) e una interfaccia VME. Nella prima parte di questo documento sono descritti i principi di funzionamento e l’architettura del TDC e del DAQ; nella seconda parte sono descritte le modalita' di configurazione del sistema e la formattazione dei dati in uscita. |
| 5284 | 2012-05-02 | Noise lower limit calculation for SuperB DCH Cluster Counting front-end electronics | 2012 | INFN-12-06-LNF.pdf | A. Balla, M. Beretta, P. Ciambrone , G. Felici, M. Gatta, L. Iafolla | Cluster counting technique [1] can improve particles identification in tracking devices, like drift chambers, by removing Landau tails. The technique is based on the counting of primary ionization clusters and, to be implemented, it requires slow drift velocity gas mixtures, fast amplifiers, fast sampling devices (> 1GS/s) and, finally, correct termination of the sense wire (to avoid signal reflection). Because the termination resistor low value, its noise contribution is not negligible then setting a lower limit on the readout chain noise. |
| 5283 | 2012-04-26 | Cesàro’s summability vs Dirac’s delta | 2012 | INFN-12-05-LNF.pdf | M. Pallotta | We will see that with the Cesàro’s summability we can have a function which is defined on [0,+\infty), it is zero everywhere and (+\infty) at point 0. Later we will study its properties. In addition we will identify a set of functions that they define the Dirac’s delta too. |
| 5282 | 2012-04-20 | MATPRO – Upgraded version 2012: a computer library of material property at cryogenic temperature | 2012 | INFN-12-04-MI.pdf | G. Manfreda, L. Rossi, M. Sorbi | For computing of quench propagation in superconducting magnets, a number of material properties from cryogenic to room temperature are necessary. The code MATPRO is a computer library, developed in the LASA lab, to providing thermal and electric properties at cryogenic temperatures of most used materials in superconducting magnets. Specific heat is provided for many materials, too. Although not complete, and with some limitations that are evidenced int eh paper, the library might be useful to be integrated into suitable custom numerical codes., Written in Fortran language, MATPRO library can work also as stand alone and can be interrogated in order to give in output both the required property or tables easy to be plotted. This paper is a description of the updated version of MATPRO released in 2012. The previous edition of MATPRO is described in [1]. |
| 5281 | 2012-04-03 | Tools and facilities of the Milan section of the INFN | 2012 | INFN-12-03-MI.pdf | F. Broggi | In this note the main tools, experimental capabilities, and intellectual know-how of the Milan section of the INFN are listed. The main purpose is to spread out informations outside INFN and especially to the productive world, as a starting point towards future collaborations with the industries. |
| 5280 | 2012-04-02 | Diffraction radiation of electron bunches for one- and two-slit systems | 2012 | INFN-12-02-LNF.pdf | V. Shpakov, S. B. Dabagov | New research in acceleration physics leads to growing up the power of charged particles bunches. Existed methods based on interaction of detection devices with bunches do not satisfy our need, because of the fact that new high intensity bunches can damage this devices. Moreover, these methods do not allow analyzing the bunches in real time. Recently new technique based on ODRI (optical diffraction radiation interference) by a bunch at its propagation through the slit was proposed. In this work the results of theoretical simulations on diffraction radiation, in particular ODRI, by electrons for various slit systems as well as the comparison with the DESY experimental data are presented. |
| 5279 | 2012-03-20 | Relativistic tests | 2012 | INFN-12-01-GE.pdf | M. Conte | In this paper we propose to use as a tool for relativistic tests light ions capable of emitting e.m. radiation. Single-ionized Helium atoms look to be the most appropriate particles. |
| 5275 | 2011-12-22 | Software per la rilevazione di vibrazioni | 2011 | LNF-11-20(NT).pdf | S. Fioravanti | Descrizione del software per la rilevazione delle vibrazioni sull’apparato sperimentale KLOE. Di seguito, saranno descritti tutti i passaggi per una corretta configurazione di una scheda NI PXI-4472, e come compilare il software. |
| 5273 | 2011-12-21 | PRESS-MAG-O: status of the commissioning and of the associated R&D | 2011 | LNF-11-19(NT).pdf | A. Puri, A. Marcelli, M. Cestelli Guidi, P. Postorino, E. Pace, A. De Sio, L. Gambicorti, G. Della Ventura, A. Notargiacomo, D. Di Gioacchino | PRESS-MAG-O is a unique innovative apparatus under commissioning at the Laboratori Nazionali di Frascati of the Istituto Nazionale di Fisica Nucleare (INFN), designed to perform experiments on materials under extreme conditions. The instrument will allow concurrent magnetic and spectroscopic experiments under high pressure and high DC magnetic field in a wide temperature range. A highly sensitive SQUID gradiometer designed to fit inside a diamagnetic DAC cell and cooled inside the cryostat hosting a 8 T superconducting magnet is the heart of the instrument. The cryostat has been designed with four access ports two of them equipped with special windows and optical lenses to focus and collect radiation down to the IR region to perform spectroscopic experiments on the sample loaded in the DAC. In this report we summarize the technical characteristics of the system and the status of test and commissioning at the end of 2011. |
| 5274 | 2011-12-21 | MID2 | 2011 | INFN-TC-11-10.pdf | M. Cresta, B. Gianesin, M. Marinelli, F. Pratolongo | In questa nota si descrive lo strumento MID2 che sostituisce il prototipo all'ospedale Galliera di Genova per la misura non invasiva del sovraccarico di ferro nell'uomo. E' analizzato, brevemente, il principio di funzionamento dello strumento per proseguire con la spiegazione degli elementi che lo compongono cioè il Rack, il Suscettometro la Barella e il Laser. Per ogni parte si descrivono i suoi componenti e le loro connessioni. Nella seconda parte della nota si trovano tutti gli schemi elettrici necessari alla comprensione del funzionamento dello strumento che fanno parte integrante del fascicolo tecnico consegnato all'ospedale. |
| 5270 | 2011-12-15 | The Fancy Table, a 5-axis silicon detector beam test bench | 2011 | INFN-TC-11-8.pdf | G. Alampi, G. Cotto, P. Mereu, D. Gamba | We describe a specially designed motorized table, the “fancy table”, to test on a beam line prototypes of devices, like MAPS, HyPixels, microstrip detectors, with sensible area varying from few mm2 to dozens of cm2. |
| 5271 | 2011-12-15 | Electrostatic Storage Ring | 2011 | INFN-TC-11-9.pdf | M. Conte | In the trial [1] of measuring the proton electric moment, storage rings with electrostatic lattice have been considered. Here an overview is given about the main parameters regarding such a kind of focusing. Beyond confirming all the issues regarding this subject, a non-null element M31 is introduced in all the 3 × 3 matrices which deal with the vector (x, x′, Δp/p) and its role is discussed. |
| 5267 | 2011-11-22 | Development of a High Temperature Hybrid CMNS Reactor | 2011 | LNF-11-17(P).pdf | F. Celani, P. Marini, V. di Stefano, M. Nakamura, O. M. Calamai, A. Spallone, A. Nuvoli, E. Purchi, V. Andreassi, B. Ortenzi, F. Piastra, E. Righi, G. Trenta, E. Marano. | We presents some improvements on the reactor presented at ICCF14 (Washington D.C. August 2008): use of long-thin Pd wires with nano-coated surfaces by multi-layers of several elements, loading with D2 at pressure <10bar; wires temperatures >500°C; Stainless Steel (SS) reactor wall temperature <100°C; current density along Pd up to 45 kA/cm2; voltage drop along the Pd wire up to 70V. Mainly, the Pd wire temperature was increased up to 750°C and was improved the temperature detection of anomalous excess heat, if any, using a SS shielded type K thermocouple: it was put inside a small Cu tube, used as thermal equalizer, where, at the outer surface, both the “active” Pd wire and the “reference” Pt were twisted. The overall results were in agreement with that obtained in 2008 experiments and they confirm the positive effect of high temperatures in increasing the amount of anomalous energy gain. In both the experiments the fast and simple isoperibolic calorimetry was used. Main gas adopted were: He and He (60%)-Ar(40%) mixture, both for calibration purposes; D2 and D2(60%)-Ar(40%) as potentially active gas. |
| 5268 | 2011-11-22 | On Proton Multiple Inelastic Nuclear Interactions in Bent Crystals | 2011 | LNF-11-18(R).pdf | A. Babaev, S. Dabagov | The probability of inelastic nuclear interactions is studied for relativistic channeled and quasi-channeled protons in a bent crystal. Multiple passage of projectiles through experimental setup was in details considered. Simulation results were compared with known experimental ones, paying attention to the features observed. |
| 5266 | 2011-11-21 | Brief Explanation of Experimental Data Set on Excess Heat and Nuclear Transmutation in Multiplly Nanocoated Ni Wire | 2011 | LNF-11-16(P).pdf | H. Kozima, F. Celani | Experimental data of excess heat generation and nuclear transmutation obtained in Ni wire multiplly nano-coated with Pd and a compound of B, Sr, Ba and Th at up to 900 degC have been analyzed using the TNCF model. The Ni wire is 50 μm in diameter and 82 cm long. The coating is made of Pd and the compound about 50 times resulting in a surface layer of about oneμm thick. The maximum excess energy Qmax is 1800 W/g of the Ni wire. There have occurred various nuclear transmutations. The most notable results are enumerated as follows: (1) Elements Ti, Cr, Co, As, Ir, and Tl have increased. (2) B, Sr, Pd and Ba have decreased. (3) Fe and Ni have not showed remarkable change. (4) In the case of B, Sr and Ba, the rates of the decrease are larger for lighter isotopes. (5) 105B/115B ratio decreased over 14%. (6) 10546Pd decreased about 5% and 10246Pd increased about 9%. These data have been analyzed using the TNCF model successfully applied for explanation of various experimental data sets over the past 15 years. We can estimate the parameter of the model nn using the data for 105B and 10546Pd as follows; nn = 1.3 × 109 cm–3 (by the decrease of 105B) and nn = 2.5 × 1011 cm–3 (by the decrease of 10546Pd). These values show the situation in the experiment belong to a range of fairly large value of the parameter where we can expect the nuclear reactions by a single neutron and also a n-p cluster. The excess heat generation of 1800 W/g at its maximum has been investigated using the value of nn estimated above and a formula for the excess energy is induced. Assuming the surface layer of 1μm thick is made of Pd only, for illustrative purposes, we have obtained Qav about 1% of the observed maximum one. If the average value of the excess energy is about 10% of the maximum, the discrepancy is about one order of magnitude. If we know the correct composition of the surface layer, the calculated value of Qav will increase a little. The nuclear transmutation of several elements confirmed by the experiment is qualitatively explained assuming the single neutron absorption by elements in the surface layer. The decrease of Ru might be explained by a single n-p cluster absorption. |
| 5265 | 2011-11-03 | FastCam Nuova Ultraveloce Streak-Camera: Studio del Trasporto del Fascio di Elettroni in Camera UHV | 2011 | LNF-11-15(IR).pdf | A. La Monaca, D. Nanni, F. Terra | Il progetto FastCam, sviluppato nei LNF dell’INFN per la rivelazione di eventi luminosi ultraveloci (femtosecondi) ed applicazione alla diagnostica del laser FLAME, è qui presentato. FastCam è un’innovativa streak camera a scansione sincrona, di alta risoluzione spaziale e temporale, in cui la deflessione del fascio elettronico è ottenuta per mezzo del profilo veloce di un campo elettrico trasversale di una particolare cavità RF, accordata a 5.2 GHz. I parametri del fascio elettronico sono stati studiati con SIMION 8.0, un programma di simulazione di ottica ionica a 2D e 3D. In particolare, è stato analizzato il parametro che più limita la risoluzione temporale della streak camera, la dispersione che il fascio elettronico subisce nel transito della camera UHV. Le simulazioni sono state organizzate in modo da ottenere dimensioni e caratteristiche del fascio in funzione di ogni suo parametro nelle varie regioni attraversate della streak camera. La propagazione degli elettroni è stata simulata sotto l’effetto delle tensioni di griglia catodica e delle lenti focheggianti di Einzel, considerando l’effetto della carica spaziale, della distribuzione di energia dei fotoelettroni e le caratteristiche geometriche e costruttive del sistema. I risultati della simulazione hanno permesso di dare un primo notevole contributo ad ottimizzare il prototipo di streak camera qui presentato. I calcoli teorici, fatti su modelli matematici di trasporto di fascio di elettroni nella camera da vuoto dal percorso e campi elettrici ottimizzati, sono stati perfezionati, usando Mathematica della Wolfram. Il risultato di questi calcoli fornisce una risoluzione temporale inferiore a 170 fs per gli impulsi della luce visibile. |
| 5269 | 2011-10-26 | Calibrating the Photosensors for the DCAL Extension of the Alice Electromagnetic Calorimeter: An Activity Report | 2011 | INFN-TC-11-7.pdf | F. Astuti, A.Badalà, A.Calivà, A.Grimaldi, V.Indelicato, P. La Rocca, F.Librizzi, G.S.Pappalardo, O.Parasole, C.Petta, F. Riggi | The activity carried out to characterize and assemble a final set of about 1700 Avalanche Photo Diodes (APD) to be used in the additional super-modules of the DCAL ALICE electromagnetic calorimeter is described |
| 5264 | 2011-10-17 | Production and Study of Baryons with Beauty at the Italian Heavy-Flavor Factory SuperB | 2011 | LNF-11-14(P).pdf | A. Feliciello, T. Bressani, V. Lucherini | SuperB is an INFN flagship project for a new high-luminosity heavy-flavor factory. Along with its companion detector, it is dedicated to the search for CP violation effects in the $B$ meson sector with the aim of looking for direct and indirect signals of new physics, beyond the Standard Model. However it could offer as well the opportunity for a systematic, high-statistics study of $b$ baryon properties and for a search for super-nuclei, that is bound nuclear systems with an explicit content of beauty. |
| 5263 | 2011-10-07 | The Spin Contribution to the Synchrotron Light | 2011 | INFN-TC-11-6.pdf | M. Conte | In order to detect the spin contribution to the synchrotron radiation, the so-called spin light, we propose to compare the characteristics of the radiations emitted by a spin-less charged particle with the huge crop of data regarding the synchrotron light, i.e. the radiation emitted by particles endowed with a magnetic moment. Helium nuclei are proposed as the lightest stable spin-less charged particles available. |
| 5260 | 2011-09-06 | Interventi su KERNEL e Microcode per Adeguare il Processore AMD 8356 REV. B2 all’Ambiente GRID | 2011 | INFN-CCR-11-1.pdf | D. Fabiani, E. Mazzoni | Nel periodo 2009-2010 la Sezione di Pisa ha installato e messo in produzione un cluster da 1024 core composto dal 128 server bi-processori equipaggiati con CPU AMD Opteron 8356 rev. B2, quad core. Subito dopo l’avvio del cluster (sotto GRID) sono stati riscontrati problemi di prestazioni legati al processore. Il presente lavoro descrive la situazione registrata e gli interventi apportati al Kernel Linux ed al Microcode per ovviare al problema. |
| 5261 | 2011-09-01 | A Data Environment for Software Development Process | 2011 | INFN-CCR-11-2.pdf | M. Canaparo, C. Galli, E. Ronchieri, C. Vistoli | The maturity of software development process is strictly related to the implementation of the best practices typically followed by software team to perform particular tasks and to meet particular objectives. Its improvement is guaranteed by the presence of metrics that are designed and measured to plan and control productivity, effectiveness, quality and timeliness of software projects and products. The measurement of metrics contributes to collecting right data to the handling of the analysis process, and to establishing a dashboard to the management of the overall health of the process. This paper describes a data environment suitable for improving the quality of the software process, developed in the context of the ETICS 2 European project. The data environment encompasses: 1) the trend analysis disseminator; and 2) the representation of software metrics and other useful software project information according to a standard organizational dashboard. The paper also describes the data environment implementations. |
| 5259 | 2011-07-15 | Photons and $\\ pi^0$ discrimination in the electromagnetic calorimeter (EMCal) of the ALICE experiment | 2011 | LNF-11-13(P).pdf | A. Casanova Diaz, L. Calero Diaz, G. Conesa Balbastre, L. Cunqueiro Mendez | The ALICE experiment at the LHC identifies photons, electrons and neutral mesons with the electromagnetic calorimeters PHOS and EMCal. At high transverse momentum the $pi^0$ decays into two photons with a small aperture angle in the lab system, what makes difficult their identification as separated photons in the calorimeters. One of the proposed methods to discriminate between photons and high momentum $pi^0$s is to study the shape of the shower produced in the calorimeter. In this note we present our results for shower shape MC studies using EMCal. We identify photons with an efficiency higher than the 80% for photons with energies in the range 10-25 GeV. |
| 5258 | 2011-07-14 | A possible infrared origin of leptonic mixing | 2011 | LNF-11-12(P).pdf | F. Terranova | Fermion mixing is generally believed to be a low-energy manifestation of an underlying theory whose energy scale is much larger than the electroweak scale. In this paper we investigate the possibility that the parameters describing lepton mixing actually arise from the low-energy behavior of the neutrino interacting fields. In particular, we conjecture that the measured value of the mixing angles for a given process depends on the number of unobservable flavor state at the energy of the process. We provide a covariant implementation of such conjecture, draw its consequences in a two neutrino family approximation and compare these findings with current experimental data. |
| 5257 | 2011-07-05 | Il Progetto della Nuova Sala Calcolo e la Farm di ATLAS dei Laboratori Nazionali di Frascati | 2011 | LNF-11-11(IR).pdf | E. Vilucchi, A. Annovi, M. Antonelli, F. Cerutti, A. Martini, M. Pistoni, R. Ricci, U. Rotundo, S. Vescovi, C. Gatti, M. Testa | I Laboratori Nazionali di Frascati ospitano un proto-Tier2 di ATLAS e alcune risorse di calcolo e di storage ad uso del gruppo locale. La farm in Grid svolge le funzioni di un Tier2, pur essendo di dimensioni ridotte (circa un terzo di un Tier2). Oltre alla farm di ATLAS, i Laboratori ospitano cluster di calcolo e risorse di storage di altri gruppi, tra cui: il gruppo degli acceleratori impegnato nel progetto SuperB, il gruppo ALICE, il gruppo dei teorici, ecc...; per cui si è ritenuto opportuno costituire, all’interno del servizio del centro di calcolo, un reparto dedicato al calcolo scientifico [CS]. La creazione di questo reparto, subordinata a una serie di lavori infrastrutturali da realizzare, consentirà la collaborazione tra gli esperimenti, al fine di arrivare alla condivisione di competenze e all’acquisto di sistemi di calcolo e storage comuni. Inoltre, la messa in comune di alcuni servizi (ad esempio: un unico sistema di code batch e un server per le installazioni comune) e di personale tecnico dedicato porterebbe certamente ad un uso più efficace delle risorse umane. |
| 5256 | 2011-06-24 | Down Going Muon Rate Monitoring in the Antares Detector | 2011 | INFN-TC-11-5.pdf | K. Gracheva, M. Anghinolfi,V. Kulikovskiy, E. Shirokov, Y. Yakovenko | Large underwater telescopes have been proposed as a challenging method to measure high energy neutrinos from astrophysical objects. In recent years, The Antares collaboration has designed and realized the first detector of this type in the Mediterranean Sea. Muon tracks produced by the neutrino interaction in the surrounding medium are reconstructed from the arrival time and the number of photo-electrons of the Cherenkov light measured by the Photomultiplier tubes (PMT) array of the detector. In order to provide sufficient statistics, the events from various periods in the year must be summed together taking care of the various environmental conditions and detector configurations. In this note we describe effective criteria to group compatible runs based on the effective number of active PMTs in each run. |
| 5255 | 2011-06-22 | PORFIDO: Oceanographic Data Sensor for the NEMO Phase 2 Tower | 2011 | LNF-11-10(P).pdf | O. Ciaffoni, M. Cordelli, R. Habel, A. Martini, L. Trasatti | PORFIDO (Physical Oceanography by RFID Outreach) is a system designed to gather oceanographic data in parallel with underwater Cerenkov neutrino experiments, without interfering with the main setup. A sensor is glued to the outside of an Optical Module, in contact with seawater, and a reader is placed inside, facing the sensor. Data are collected by the sensor and transmitted to the reader through the glass by RFID. The sensor gathers power from the radio frequency, thus eliminating the need for batteries or connectors through the glass. In the framework of KM3Net, we plan to deploy several PORFIDO probes with the NEMO Phase 2 tower in 2011 1). We have performed several tests to prove the functionality of the system and the absence of any interaction with the NEMO electronics. |
| 5254 | 2011-06-15 | SuperB Progress Report: The Collider | 2011 | LNF-11-9(P).pdf | Eds.: M.E. Biagini, R.Raimndi, J. Seeman | |
| 5253 | 2011-05-30 | Collaborative Research for a High-Resolution VUV Free Electron Laser User Facility at SPARC | 2011 | LNF-11-8(NT).pdf | M. Coreno, L. Giannessi, R. Gunnella, A. Marcelli, E. Pace, L. Poletto, N. Zema | Free electron lasers (FELs) are unique sources of tunable coherent radiation, based on the interaction of a relativistic electron beam with a permanent magnetic field. Taking advantage of their characteristics, many scientific applications are possible using these 4th generation powerful sources of radiations. With its high-quality beam the SPARC FEL designed to work at long wavelengths allows non-linear coherent harmonic generation also in the VUV range. Although other FEL proposals are under discussions in other European facilities in addition to SPARC a few other projects may now offer similar performances: TESLA at Hamburg and FERMI at Trieste. The document is a proposal to use the radiation emitted by SPARC in the ultraviolet range with a unique beamline to be installed in the LI2FE laboratory based on a high resolution monochromator made available from the STFC Daresbury Laboratory (U.K.). |
| 5252 | 2011-05-23 | Report of the INFN - Group 2 Stratospheric Balloons Working Group | 2011 | LNF-11-7(IR).pdf | S. Masi, P. De Bernardis, D. Campana, F. Gatti, N. Giglietto, A. Melchiorri, R. Mussa, F. Terranova | In 2011 a working group dedicated to the study of the physics opportunities offered by stratospheric balloons has been formed within the INFN “Commissione II” (Astroparticle physics). The Working Group has been mandated to investigate the role that future balloon-borne experiments can play in the next 5-10 years and the scientific and technological issues that can be addressed with this technique without resorting to space-based experiments. This report summarizes the findings of the working group and its recommendations. |
| 5251 | 2011-05-18 | The Measurement of Late-Pulses and After-Pulses in the Large Area Hamamatsu R7081 Photomultiplier with Improved Quantum-Efficiency Photocathode | 2011 | INFN-TC-11-4.pdf | S. Aiello, M. Anghinolfi, A. Balbi, M. Brunoldi, K. Gracheva, A. Grimaldi, V. Kulikovskiy, E. Leonora, G. Ottonello, D. Sciliberto, M. Taiuti, Y. Yakovenko | In recent years, large underwater telescopes have been designed and realized to measure high energy neutrinos from astrophysical objects. Muon tracks produced by the neutrino interaction in the surrounding medium are reconstructed from the arrival time and the number of photo-electrons of the Cherenkov light measured by the Photomultiplier tubes (PMT) array of the detector. For a correct reconstruction procedure, both the scattering of the light in the water and the late and after pulses produced in the PMTs must be considered. In this paper we report on this latter effect which has been measured in our laboratory using a laser in the single photoelectron mode (SPE) on a Hamamatsu R7081MOD 10' PMT with a high quantum efficiency photocathode. The PMT voltage supply was set to provide the 1 photo-electron peak at 10 pC as during normal operation: in this condition we find that the late-pulse contribution is small but not negligible. |
| 5250 | 2011-05-04 | Annual Report 2010 | 2011 | AA.VV. | ||
| 5248 | 2011-04-07 | Analysis of Relativistic Proton Deflection by Bent Crystals | 2011 | LNF-11-4(P).pdf | A. Babaev, and S.B. Dabagov | The peculiarities of the motion of charged particles through the bent crystals open wide possibilities to manipulate charge particle beams. Namely, bent crystal techniques allow deflecting and separating the particles on dependence of their energies. In this manuscript simulations for the deflection of relativistic proton beam by bent crystallographic planes are presented; our simulations are based on the numerical solution of the equation for radial proton motion. |
| 5249 | 2011-04-07 | Measurement of the Absolute Gas Gain and the Gain Variations Study in Straw-Tube Detectors | 2011 | LNF-11-5(P).pdf | A. Kashchuk, P. Gianotti, O. Levitskaya, L. Passamonti, D. Pierluigi, A. Russo, M. Savrie | We present results the absolute gas gain measurement of a straw drift-tube detector filled with the binary gaseous mixture ArCO2(10%) at 2 bars gas pressure. The measurement was performed using intensive 1.3 GBq 137Cs-source in order to be able to measure the primary ionization current corresponding to the unity gas gain. The results of gas gain measurement vs. voltage at fixed gas pressure and temperature were fitted and parameterized by Diethorn’s formula for further studies of the gas gain variations. |
| 5247 | 2011-04-06 | Cold Nuclear Fusion | 2011 | LNF-11-3(P).pdf | E.N. Tsyganov (UA9 Collaboration) | Recent accelerator experiments on fusion of various elements have clearly demonstrated that the effective cross-sections of these reactions depend on what material the target particle is placed in. In these experiments, there was a significant increase in the probability of interaction when target nuclei are imbedded in a conducting crystal or are a part of it. These experiments open a new perspective on the problem of so-called cold nuclear fusion |
| 5246 | 2011-03-30 | The International Linear Collider – A Technical Progress Report | 2011 | LNF-11-2(NT).pdf | Eds.: E. Elsen, M. Harrison, L. Hesla, M. Ross, P. Royole-Degieux, R. Takahashi, N. Walker, B. Warmbein, A. Yamamoto, K. Yokoya, M. Zhang | |
| 5245 | 2011-03-21 | Riprogettazione del Sito WEB della Sezione di Trieste dell'INFN in Base ad Alcuni Principi del Design Centrato sull'Utente | 2011 | INFN-TC-11-3.pdf | C. Strizzolo, E. Fragiacomo, E. Novacco, S. Piano, G. Venier, N. D'Antoni, A. Richetti | Il sito web della Sezione di Trieste dell'INFN è stato completamente ristrutturato nel 2010. Questo documento descrive il processo di analisi e riorganizzazione, basato su alcune tecniche e modalità di lavoro proprie della progettazione centrata sull'utente (User Centered Design). |
| 5244 | 2011-02-28 | Preliminary Tests of a Scintillator-Based Mini-Station for Extensive Air Showers Measurements | 2011 | INFN-TC-11-2.pdf | S. Aiola, P. La Rocca, O.P arasole, F. Riggi | This Report describes the construction, working conditions and preliminary tests for a mini-station to be employed for educational cosmic ray measurements. The individual detectors are based on small scintillation tiles with a wavelength shifter (WLS) readout. Low cost, dedicated power supplies have been designed for each individual unit. Signal handling, data acquisition and time stamping of the collected events may be provided by dedicated Quarknet cards. The combined use of at least three such detectors placed at a proper relative distance will allow the detection and, to some extent, the reconstruction, of extensive air showers. |
| 5243 | 2011-02-21 | Bruno Touschek: Particle Physicist and Father of the $e^+e^-$ Collider | 2011 | LNF-11-1(P).pdf | L. Bonolis, G. Pancheri | This article gives a brief outline of the life and works of the Austrian physicist Bruno Touschek, who conceived, proposed and brought to completion the construction of AdA, the first electron-positron storage ring. The events which led to the approval of the AdA project and the Franco-Italian collaboration which confirmed the feasibility of electron-positron storage rings will be recalled. We shall illustrate Bruno Touschek's formation both as a theoretical physicist and as an expert in particle accelerators during the period between the time he had to leave the Vienna Staat Gymnasium in 1938, because of his Jewish origin from the maternal side, until he arrived in Italy in the early 1950s and, in 1960, proposed to build AdA, in Frascati. The events which led to T 's collaboration with Rolf Widero e in the construction of the first European betatron will be described. The article will make use of a number of unpublished as well as previously unknown documents, which include an early correspondence with Arnold Sommerfeld and BT 's letters to his family in Vienna from Italy, Germany and Great Britain. The impact of T 's work on students and collaborators from University of Rome will be illustrated through his work on QED infrared radiative corrections to high energy $e^+e^-$ experiments and the book {it Meccanica Statistica}. |
| 5240 | 2011-01-19 | Charge Breeding Simulations in a Hollow Gun Ebis | 2011 | INFN-TC-11-1.pdf | V. Variale | Charge breeding technique is used for Radioactive Ion Beam (RIB) production in the Isotope Separation On Line (ISOL) method in order of optimizing the re-acceleration of the radioactive element ions produced by a primary beam in a thick target. That technique is realized by using a device capable of increase the radioactive ion charge state from +1 to a desired value +n. In some experiments a continuous RIB of a certain energy could be required. Recently, a charge breeding device based on a hollow gun EBIS that in principle could reach a Continuous Wave (CW) operation, has been proposed1). Although, in principle, the hollow in the electron beam produced by that EBIS can be reduced up to zero by an enough high focussing solenoid magnetic field, a reduction on the ion charge state increase efficiency should be expected. In order to study that problem, a code already developed for studying the ion selective containment in a EBIS with RF quadrupoles, BRICTEST2), has been implemented. In this paper, the ion charge state breeding decrease due to the hollow electron beam has been studied by simulating the ion motion inside the hollow gun EBIS with the implemented BRICTEST code |
| 5239 | 2010-12-21 | A High-Luminosity e+ e- Collider for Precision Experiments at the GeV scale | 2010 | LNF-10-25(IR).pdf | G. Venanzoni, D. Babusci, M. Bertani, C. Bloise, F. Bossi, A. Clozza, A. Drago, A. Gallo, G. Isidori, C. Milardi, M. Mirazita, D. Moricciani, A. Passeri, M. Preger, P. Raimondi, C. Sanelli, B. Spataro, S. Tomassini, M. Zobov, et. al. (the total list of autors is reported in the last page of the document) | This document, prepared for the European Call FP7-INFRASTRUCTURES-2011-1, describes the proposal for a design study for a high-luminosity (1033cm-2s-1) electron-positron (e+e-, in the following) collider with a variable center of mass energy in the range from about 0.6 GeV to about 3 GeV |
| 5238 | 2010-12-15 | Material Studies for the RPC Muon Detector of CMS | 2010 | LNF-10-24(NT).pdf | S. Bianco, S. Colafranceschi, F. Felli, T. Greci, L. Passamonti, D. Pierluigi, C. Pucci, A. Russo, G. Saviano | The RPC muon detector of the CMS experiment at the CERN Large Hadron Collider uses fluorine-based gases in volumes made by bakelite plates, in high-radiation environment. Studies of radiation damage on bakelite are presented. Bakelite samples were taken from gaps irradiated at the GIF. Preliminary results on an analysis campaign based on SEM-EDS, XRD and chemical analyses performed on a high-statistics sample will be discussed. |
| 5236 | 2010-11-19 | On Moderate Energy Electron Dechanneling in Thick Si Crystals | 2010 | LNF-10-22(IR).pdf | O.V. Bogdanov, and S.B. Dabagov | A model of planar channeling of 400 MeV electrons taking into account the dechanneling processes in a crystal is developed. The dynamics of the initial angular distribution of relativistic electrons as a function of standard deviation has been studied. The simulation results for the density function of channeled projectiles distribution in a thick Si (111) crystal are presented. |
| 5237 | 2010-11-19 | Caratterizzazione preliminare del sistema di misura di campo magnetico del B-TRAIN di CNAO | 2010 | LNF-10-23(IR).pdf | G. Franzini, D. Pellegrini, A. Stella, M. Pezzetta, M. Pullia | |
| 5214 | 2010-10-26 | A 1 mm Scintillating Fibre Tracker Readout by a Multi-anode Photomultiplier | 2010 | LNF-10-21(P).pdf | B.D. Leverington, M. Anelli, P. Campana, R. Rosellini | WThis technical note describes a prototype particle tracking detector constructed with 1 mm plastic scintillating bres with a 64 channel Hamamatsu H8500 at-panel multi- anode photomultiplier readout. Cosmic ray tracks from an array of 11 gas- lled drift tubes were matched to signals in the scintillating bres in order to measure the resolution and eciency of tracks reconstructed in the bre-based tracker. A GEANT4 detector simulation was also developed to compare cosmic ray data with MC results and is discussed in the note. Using the parameters measured in this experimental setup, modi ed bre tracker designs are suggested to improve resolution and eciency in future prototypes to meet modern detector speci cations. |
| 5213 | 2010-09-28 | Alcune Tecniche per Grid e Dintorni | 2010 | INFN-CCR-10-6.pdf | A. Ciampa, S. Arezzini, D. Fabiani, E. Mazzoni | Nel presente lavoro verranno descritte le seguenti tecniche realizzate e messe in produzione nel GRID Data Center della Sezione di Pisa dell’INFN: • Utilizzo di chroot per l’implementazione dei worker node e dei server di middleware di GRID. L’obiettivo principale che si vuole perseguire è il disaccoppiamento tra l’hardware (in generale il sistema sottostante) ed il server che gira l’applicativo. Per questa strada si può ottenere anche un altro importante risultato per i worker node: la possibilità di offrire diverse configurazioni e tipologie di server, anche con controllo dinamico. Riferendosi al punto successivo, si possono gestire dinamicamente configurazioni per worker node e nodi per code locali. • Coesistenza di code locali e GRID sulla stessa farm con possibilità di dare accesso alle code locali anche ad una comunità remotamente distribuita. Il primo punto ha l’obiettivo di estendere idealmente la modalità di condivisione di risorse anche al di fuori del paradigma GRID, tendendo ad includere quegli utenti che presentano esigenze più spostate verso l’interattivo. Il secondo punto, che rappresenta un esempio dell’utilizzo e dell’utilità del progetto AAI, tende a dare alle code locali lo stesso tipo di canale di fruizione che caratterizza le code GRID. L’infrastruttura AAI utilizzata per dare accesso remoto alle code locali può addirittura essere utilizzata per accedere alle stesse code GRID. • L’utilizzo di GPFS come file system sottostante ad un SRM (a Pisa abbiamo inproduzione sia dCache che StoRM), permette il facile import/export di file tra aree sotto SRM e aree accedute direttamente via Posix. Questo è un tassello importante nell’integrazione dell’ambiente GRID con l’ambiente delle code locali, specialmente se pensiamo ad una realizzazione coerente di una struttura che metta risorse in condivisione tra i Tier2 e i futuri Tier3. |
| 5212 | 2010-09-23 | Valutazione di Apparati di Aggregazione e di “Edge Routing” per i TIER2 INFN | 2010 | INFN-CCR-10-5.pdf | A. Brunengo, A. De Salvo, D. Di Bari, G. Donvito, R. Gomezel, P. Lo Re, G. Maron, E. Mazzoni, M. Morandin, A. Spanu, S. Zani | Scopo di questo documento è di riportare ai siti ospitanti i centri di analisi LHC di secondo livello (Tier2) e ai relativi servizi calcolo il lavoro fatto dal gruppo NetArch della CCR nell’ambito dell’evoluzione a 10 Gbps della rete delle farm dei suddetti centri. Viene anche affrontata la problematica dell’accesso a 10 Gbps di questi centri T2 all’infrastruttura ottica della rete della ricerca denominata Garr-X. Questo documento focalizza quindi l’attenzione sul centro T2 e sulle possibili architetture di rete in grado di connettere nei modi più efficaci il set di worker nodes con i relativi server di disco garantendo al tempo stesso un flusso duplex a 10 Gbps verso la WAN. Il documento non si occupa invece della topologia di connessione tra i vari T2 con il T1 nazionale e con gli altri siti Tier internazionali. Queste informazioni sono riportate in “Proposta INFN per la rete dei Tier2 di LHC in GARR-X” (documento CCR-37/2010/P), prodotto sempre dal gruppo NetArch. |
| 5209 | 2010-09-20 | Operational Methods and Lorentz-Type Equations of Motion | 2010 | LNF-10-19(P).pdf | D. Babusci, G. Dattoli, E. Sabia | We propose an operational method for the solution of differential equations involving vector products. The technique we propose is based on the use of the evolution operator, defined in such a way that the wealth of techniques developed within the context of quantum mechanics can also be exploited for classical problems. We discuss the application of the method to the solution of the Lorentz-type equations. |
| 5210 | 2010-09-20 | CMS Trapezoidal GEM Foils Structural Analysis | 2010 | LNF-10-20(IR).pdf | G. Raffone | The demand of large area GEM detectors requires extreme working conditions of the layered foils from structural point of view; larger area need higher biaxial tensile loads to overcome large deflections and the related stresses may exceed the copper yield limit just around the holes; the present work shows that for a trapezoidal CMS GEM foil (W=1040 mm; L1=530 mm; L2=345 mm) the sag due its own weight is about 28.6 μm f  (electrostatic loads not included) for a tensioning of S=1 N/mm; the related stresses are lower than the yield only in a biaxial load. Numerical results are from ANSYS Educational v. |
| 5208 | 2010-09-07 | HEP-SPEC06 - Guida All’Uso | 2010 | INFN-CCR-10-3.pdf | A. Crescente, M. Michelotto | Recentemente la comunità delle alte energie ha scelto un nuovo benchmark per misurare la potenza dei nodi di calcolo. HEP-SPEC06 è il nuovo benchmark di riferimento che sostituisce SPECINT 2000. Questa nota descrive i motivi che hanno portato alla sostituzione e spiega come va usata la nuova unità di misura |
| 5211 | 2010-09-07 | Proposta INFN per la Rete dei TIER2 di LHC in GARR-X | 2010 | INFN-CCR-10-4.pdf | A. Brunengo, A. De Salvo, D. Di Bari, G. Donvito, R. Gomezel, P. Lo Re, G. Maron, E. Mazzoni, A. Spanu, S. Zani | La presente proposta è frutto di incontri con i rappresentanti di tutti i Tier di LHC italiani e quindi rappresenta una visione condivisa su come l'INFN intende connettere i propri centri di calcolo di secondo livello al Tier1 nazionale e agli analoghi centri di altre nazioni, attraverso la costituenda rete GARR-X. A questi incontri di indirizzo sono seguite numerose discussioni tecniche promosse dal gruppo NetArch della Commissione Calcolo e Reti di INFN con lo scopo di delineare i requisiti principali dei collegamenti dei Tier2 alla rete ottica di GARR-X. L’interazione con i colleghi del GARR che si occupano della nuova rete è stata frequente e il documento “Progetto di Rete GARR-X: La rete dei Tier2 dell’INFN in GARR-X” di M. Marletta, M. Carboni e C. Battista del GARR, che sostanzialmente propone gli scenari tecnici possibili per la rete dei Tier2, rappresenta il riferimento tecnico principale della presente proposta. |
| 5206 | 2010-08-04 | Indagine sui Servizi Offerti dai Servizi Calcolo dell’INFN | 2010 | INFN-CCR-10-1.pdf | S. Parlati, P. Spinnato | In questo lavoro sono presentati i risultati dell’analisi dei dati ricavati da un’indagine volta ad ottenere una panoramica sui servizi offerti dai Servizi di Calcolo dell’INFN nell’ambito del calcolo scientifico e dei servizi di base. Tale indagine ha l’obiettivo di aprire una discussione sul livello qualitativo dei servizi e sulle possibilità di apportare miglioramenti ad essi. Il lavoro si è basato sui dati ottenuti da un questionario inviato ai responsabili dei Servizi Calcolo di tutte le sedi INFN. Si è evidenziato come i Servizi Calcolo siano fortemente coinvolti nello sviluppo e nella gestione infrastrutturale delle risorse informatiche, mentre lo sono meno per quanto riguarda le applicazioni di calcolo scientifico. Si è visto inoltre come la carenza di personale faccia sì che le attività dei Servizi siano orientate principalmente ai servizi di base, soprattutto nelle sezioni con meno afferenti, mentre i laboratori nazionali riescono ad offrire un maggior supporto al calcolo scientifico. D’altro canto, il personale dei laboratori è meno coinvolto di quello delle sezioni in attività didattiche o di collaborazione con esperimenti. In questi ultimi inoltre l’incidenza del precariato è maggiore rispetto che nelle sezioni. In ultimo, si è visto come i Servizi diano un’autovalutazione positiva sul proprio operato, maggiore per gli aspetti tecnici, meno per ciò che riguarda l’interazione con gli utenti. |
| 5207 | 2010-08-04 | Progetto Cluster GRID CSN4: La Proposta di PISA | 2010 | INFN-CCR-10-2.pdf | A. Ciampa, E. Vicari | Nell’ottobre 2009 la Commissione Scientifica Nazionale 4 pubblicò, internamente all’INFN, una “Call” per la realizzazione di un cluster nazionale atto a rispondere alle esigenze di calcolo, anche parallelo, della Commissione stessa in ambito GRID. Il presente lavoro riporta la proposta progettuale della Sezione di Pisa, presentata nel dicembre 2009, elaborata secondo i requisiti stabiliti dalla Commissione stessa con il supporto di un gruppo di esperti espressi dalla Commissione Calcolo e Reti. Tali requisiti sono riportati in allegato. La proposta della Sezione di Pisa è risultata quella selezionata dalla CSN4, nel febbraio 2010. |
| 5201 | 2010-07-05 | La Trasmutazione delle Scorie Nucleari per la Chiusura del Ciclo dell’Energia Nucleare | 2010 | INFN-TC-10-6.pdf | V. Scanziani, M. L. Bonardi, F. Groppi, S. Manenti, P. Pierini | In Europa - con circa 197 reattori in funzione - con una capacità totale di 170 GWe (su un totale di 440 reattori al mondo e di circa 60 nuovi impianti in costruzione), l’energia elettrica prodotta annualmente dalla fonte nucleare costituisce circa il 23% del fabbisogno elettrico totale. Il combustibile nucleare esausto, proveniente dalle centrali nucleari adibite alla produzione di energia elettrica, costituisce la maggior parte dei rifiuti nucleari (rad-waste) prodotti ogni anno. Dall’inizio del programma nucleare fino al 2003, sono state prodotte 255 000 tonnellate di metalli pesanti, contenenti oltre 2 500 tonnellate di elementi transuranici. Il riprocessamento e lo smantellamento delle armi nucleari ha inoltre prodotto 170 tonnellate di metalli pesanti e 100 tonnellate di plutonio. |
| 5200 | 2010-06-25 | The Cantes Experiment: a Carbon Nanotubes Based Electron Gun toImprove the Performances of the Electron Cyclotron Resonance Ion Sources | 2010 | INFN-TC-10-5.pdf | F. Odorici, M. Cuffiani, L. Malferrari, R.Rizzoli, G. P. Veronese, S. Gammino, L. Celona, D. Mascali, N. Gambino, R. Miracoli, G. Castro, F. P. Romano, T. Serafino, F. Di Bartolo, V. Guglielmotti, S. Orlanducci, V. Sessa, M. L. Terranova | The increase of electron density in ECR ion sources assures efficient ionization of very low-gas-pressure plasma. The purpose of this experiment was the creation of a carbon nanotubes based electron gun, in order to inject electrons in the plasma core and to follow how the charge state distribution and the X-ray spectra change. The use of carbon nanotubes leads to an increase of the plasma density and to a relevant reduction of the number of high energy electrons, which are detrimental for the reliability of the modern ECRIS. |
| 5197 | 2010-06-23 | Proposal for taking data with the KLOE-2 detector at the DAPHNE collider upgraded in energy | 2010 | LNF-10-17(P).pdf | D. Babusci, C. Bini, F. Bossi, G. Isidori, D. Moricciani, F. Nguyen, P. Raimondi, G. Venanzoni, D. Alesini, F. Archilli, D. Badoni, R. Baldini-Ferroli, M. Bellaveglia, G. Bencivenni, M. Bertani, M. Biagini, C. Biscari, C. Bloise, V. Bocci, R. Boni, M. Boscolo, P. Branchini, A. Budano, S.A. Bulychjev, B. Buonomo, P. Campana, G. Capon, M. Castellano, F. Ceradini, E. Chiadroni, P. Ciambrone, L. Cultrera, E. Czerwinski, E. Dane', G. Delle Monache, E. De Lucia, T. Demma, G. De Robertis, A. De Santis, G. De Zorzi, A. Di Domenico, C. Di Donato, B. Di Micco, E. Di Pasquale, G. Di Pirro, R. Di Salvo, D. Domenici, A. Drago, M. Esposito, O. Erriquez, G. Felici, M. Ferrario, L. Ficcadenti, D. Filippetto, S. Fiore, P. Franzini, G. Franzini, A. Gallo, G. Gatti, P. Gauzzi, S. Giovannella, A. Ghigo, F. Gonnella, E. Graziani, S. Guiducci, F. Happacher, B. Hoistad, E. Iarocci, M. Jacewicz, T. Johansson, W. Kluge, V.V. Kulikov, A. Kupsc, J. Lee Franzini, C. Ligi, F. Loddo, P. Lukin, F. Marcellini, C. Marchetti, M.A. Martemianov, M. Martini, M.A. Matsyuk, G. Mazzitelli, R. Messi, C. Milardi, M. Mirazzita, S. Miscetti, G. Morello, P. Moskal, S. Müeller, S. Pacetti, G. Pancheri, E. Pasqualucci, A. Passeri, M. Passera, V. Patera, A.D. Polosa, M. Preger, L. Quintieri, A. Ranieri, P. Rossi, C. Sanelli, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, M. Serio, F. Sgamma, M. Silarski, B. Spataro, A. Stecchi, A. Stella, S. Stucci, C. Taccini, S. Tomassini, L. Tortora, C. Vaccarezza, R. Versaci, W. Wislicki, M. Wolke, J. Zdebik, M. Zobov | This document reviews the physics program of the KLOE-2 detector at DAFNE upgraded in energy and provides a simple solution to run the collider above the φ-peak (up to 2, possibly 2.5 GeV). It is shown how a precise measurement of the multihadronic cross section in the energy region up to 2 (possibly 2.5) GeV will have a major impact on the tests of the Standard Model through a precise determination of the anomalous magnetic moment of the muon and the effective fine-structure constant at the MZ scale. With a luminosity of about 10^32 cm^-2 s^-1, DAFNE upgraded in energy can perform a scan in the region from 1 to 2.5 GeV in one year by collecting an integrated luminosity of 20 pb^-1 (corresponding to a few days of data taking) for single point, assuming an energy step of 25 MeV. A few years of data taking in this region would provide important tests of QCD and effective theories by γγ physics with open thresholds for pseudo-scalar (like the η’), scalar (f0, f0’ , etc...) and axial-vector (a1, etc...) mesons; vector-mesons spectroscopy and baryon form factors, tests of CVC, and searches for exotics. In the final part of the document a technical solution for the energy upgrade of DAFNE is proposed. |
| 5198 | 2010-06-23 | Potenzialità di una Sorgente di Neutroni per Misure di Tempo di Volo da Installare su Spar-X | 2010 | LNF-10-18(IR).pdf | S. Bartalucci | Il progetto SPAR-X prevede la realizzazione nell’Area di Ricerca Romana di un Linac ad elettroni di elevatissima potenza di picco, ma anche di notevole potenza media, tale da aprire la possibilità di generare fasci secondari di particelle senza interferire con l’operazione principale della macchina. Nell’articolo si analizzano le potenzialità di SPAR-X quale sorgente di neutroni per misure con il metodo del tempo di volo, la cui importanza è sottolineata dal crescente interesse a livello mondiale per nuovi dati nucleari e verrebbe ad inserirsi perfettamente nel quadro programmatico che punta al rilancio dell’Energia Nucleare in Italia. Una sorgente di neutroni di basso costo ma con prestazioni in termini di intensità e risoluzione energetica all’altezza degli standard mondiali appare perfettamente realizzabile. |
| 5199 | 2010-06-23 | Presente e Futuro nell’utilizzo delle Risorse Energetiche Nucleari con una Valutazione di Rischi e Beneficii: L’Anomalia del Caso Italiano | 2010 | INFN-TC-10-4.pdf | M. Bonardi, F. Groppi | Nonostante una opposizione irrazionale e talvolta puramente ideologica, l’energia del nucleo è l’unica soluzione possibile altamente pulita, sicura ed inesauribile per risolvere il problema energetico globale in maniera sostenibile. La quantità di scorie nucleari è minima e può essere ulteriormente trasmutata mediante tecnologie dedicate. I reattori nucleari della nuova generazione possono produrre efficacemente sia elettricità sia idricità risolvendo anche il problema dei trasporti attualmente fortemente dipendente dai combustibili fossili. Purtroppo la sensazione del rischio porta l’umanità a sopravvalutare i rischi di tale fonte energetica ed a sottovalutare ampiamente altri rischi in conseguenza oltre che dell’irrazionalità, anche della disinformazione e talora dell’abitudine consolidata da molti secoli o di storia. |
| 5195 | 2010-06-18 | Nuclear Chemistry, Radiochemistry, Radiation Chemistry, Health Physics and Sustainable Nuclear Energy Production | 2010 | INFN-TC-10-2.pdf | L. Mauro, Bonardi, F. Groppi, S. Manenti, E. Rizzio, E. Sabbioni | Nuclear Chemistry, Radiochemistry, Radiation Chemistry and Heath Physics play a fundamental role in sustainable nuclear energy production. Their applications are crucial in each stage of the nuclear power cycle. There will be stressed some particular chemical steps concerning the extraction and production of fuel pellets, claddings and assemblies, water radiolysis, plant decommissioning and their reprocessing or disposal cycle. The objectives of this work are: the presentation and the discussion about strength and weakness of the nuclear and radiochemical methods to be used in the sustainable production of nuclear energy and the stressing of the great need of education and training of young scientists in the field of. nuclear and radiochemical (N&R) techniques, in order to ensure a sustainable supply of qualified personnel, whose number have declined steadily and dramatically in the last 20 years. A review on main problematic regarding the different fuel cycles is presented, distinguishing between the traditional open fuel cycle (UOT) adopted in many Countries and the more advanced close cycle, with reprocessing of the nuclear rad-waste, taking into account the partitioning (P) and transmutation (P&T) of U and Pu radionuclides, fission products (FPs), minor actinoids (MAs) and activation products. |
| 5196 | 2010-06-18 | Production of Nuclear Hydrogen Nu2 or Hydricity by High Temperature Nuclear Reactor | 2010 | INFN-TC-10-3.pdf | M. Bonardi, F. Groppi, S. Manenti | Hydrogen in both gaseous or liquid form is an energy vector also called hydricity. Hydrogen gas in very rare in the atmosphere and in geological sites, thus it must be produced with advanced technological devices, mainly by water splitting. This clean energetic utility can be produced efficiently by dedicated high or very high temperature nuclear reactors of Generation IV, instead of using the traditional methods based on steam reforming of either light hydrocarbons or coal. The advantages are evident due to the high power density of a nuclear power plants and the almost complete lacking of green-house gaseous emissions, heavy metals and radioactive ones, typical of traditional thermoelectric power plants. This method for producing NuH2 is clean, safe and environmental friendly. There are being discussed the main thermochemical and pyrochemical routes for water splitting in H2 and O2, by using at least three designs of nuclear reactors of Gen IV, that are described in some details. |
| 5193 | 2010-05-11 | Annual Report 2009 | 2010 | AA VV | ||
| 5192 | 2010-04-13 | Technical Design Report of the gamma gamma Taggers for the KLOE-2 Experiment | 2010 | LNF-10-14(P).pdf | KLOE-2 Collaboration: F. Archilli, D. Badoni, D. Babusci, G. Bencivenni, C. Bini, C. Bloise,V. Bocci, F. Bossi,P. Branchini, A. Budano, S. A. Bulychjev, P. Campana, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwinski, E. Dan`e, E. De Lucia, G. De Robertis, A. De Santis, G. De Zorzi, A. Di Domenico, C. Di Donato, B. Di Micco, D. Domenici, M. Dreucci, O. Erriquez, G. Felici, S. Fiore, P. Franzini, P. Gauzzi, S. Giovannella, F. Gonnella, E. Graziani, F. Happacher,B. Hoistad, E. Iarocci,M. Jacewicz, T. Johansson, A. Kupsc, V. V. Kulikov, L. Kurdadze, J. Lee Franzini, F. Loddo, M. A. Martemianov, M. Martini, M. A. Matsyuk, D. Mchedlishvili, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, F. Nguyen, V. Patera, A. Passeri, L. Quintieri, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, A. Sciubba, M. Silarski, M. Tabidze, C. Taccini, L. Tortora, G. Venanzoni, R. Versaci, W. Wislicki, M. Wolke, J. Zdebik and A. Balla, S. Cerioni, M. Gatta, N. Lacalamita, S. Lauciani, R. Liuzzi, M. Mongelli, A. Pelosi, M. Pistilli, V. Valentino | |
| 5191 | 2010-04-07 | Construction and Test of a Prototype of Segmented Straw | 2010 | LNF-10-13(IR).pdf | L. Benussi, S. Bianco, A. Ceccarelli, P. Gianotti, L. Passamonti, D. Pierluigi, A. Russo, A. Tiburzi | We have realized a prototype of a segmented straw tube with the intention to use it with straight straws in order to reconstruct particle trajectories in three dimensions. The basic idea is that of using the information of the “curved” straws, to allow the determination of the space coordinate along the wires of the straight tubes. To realize this project we started with the construction of a single-tube prototype made of linear segments of straw inscribed in a circle. We report here the details of the construction of the prototype, together with some preliminary tests. |
| 5190 | 2010-03-31 | Spectral Characteristics of Planar Channeling Radiation by 20-800 MeV Electrons in a Thin Silicon Carbide | 2010 | LNF-10-12(IR).pdf | B. Azadegan, and S.B. Dabagov | Spectral distributions of channeling radiation by 20÷800 MeV electrons in different planes of a thin 4H polytype silicon carbide crystal is presented. We demonstrated that channeling in 4H SiC with hexagonal structure has some new features not available in other structures. Using Doyle-Turner approximation to the atomic scattering factor and taking in to account thermal vibrations of atoms, the continuum potentials for different planes of 4H polytype SiC single crystal were calculated. In the frame of quantum mechanic, the theory of channeling radiation has been applied to calculate the transverse electron states in the continuum potential of the planes and to study transition energies, linewidths, depth dependence for population of quantum states and spectral radiation distributions. At electron energies higher than 100 MeV the spectral distributions of radiation are calculated by classical calculations and successfully compared with quantum mechanics solutions. Specific properties of planar channeling radiation in 4H polytype SiC are discussed. |
| 5187 | 2010-03-04 | X-Ray Refraction 3D-Simulation Software: First Approach | 2010 | LNF-10-9(IR).pdf | L. Marchitto, L. Allocca, D. Hampai, and S.B. Dabagov | In this work preliminary results on simulation of X-ray propagation in media characterized by low index of both refraction and absorption. First approach has proved the feasibility of typical Math code application for the analysis of X-ray imaging measurements performed by means of high-flux and low-divergent beams shaped by polycapillary half lens. |
| 5188 | 2010-03-04 | Polycapillary X-Ray Imaging of a Gasoline Spray | 2010 | LNF-10-10(P).pdf | L. Allocca, L.Marchitto, S.Alfuso, D. Hampai, G. Cappuccio, S. B. Dabagov | Laboratory X-ray techniques based on polycapillary optics have been first used for studying high dense sprays of the jet injection systems. Polycapillary optical elements are well known systems that enable shaping divergent X-ray beams (with energy of up to 30 keV) as well as to get high contrast image of the object studied due to the suppression of multiple scattered part of radiation. We have used a Cu Kα X-ray source in combination with polycapillary halflens (or semilens) and a Photonic Science CCD detector. Due to the low absorption features of gasoline for the used energy range, the images have been acquired in synchronized mode with the spray injection. As a result, it is shown that the absorption signal well emerges respect to the background indicating an interaction of the beam with the fuel. |
| 5186 | 2010-03-03 | Infrared and X-ray Simultaneous Spectroscopy: A Novel Conceptual Beamline Design for Time Resolved Experiments | 2010 | LNF-10-8(P).pdf | A. Marcelli, Wei Xu, D. Hampai, L. Malfatti, P. Innocenzi, U. Schade, and Z. Wu | Many physical/chemical processes such as metal-insulator transitions or self-assembly phenomena involve correlated changes of electronic and atomic structure in a wide time range from microseconds to minutes. To investigate these dynamical processes we not only need a highly brilliance photon source in order to achieve high spatial and time resolution but new experimental methods have to be implemented. Here we present a new optical layout to perform simultaneous or concurrent Infrared and X-ray measurements. This approach may indeed return unique information such as the interplay between structural changes and chemical processes occurring in the investigated sample. A beamline combining two X-ray and IR beams may really take advantage of the unique synchrotron radiation properties: the high brilliance and the broad spectrum. In this contribution we will describe the conceptual layout and the expected performance of a complex system designed to collect IR and X-ray radiation from the same bending magnet on a third generation synchrotron radiation ring. If realized, this beamline will allow time resolved spectroscopy experiments offering new scientific opportunities in many frontier researches. |
| 5185 | 2010-02-24 | DD Fusion in Crystals | 2010 | LNF-10-7(P).pdf | E.N. Tsyganov (communicated by S.B. Dabagov) | The article discusses the mechanism of DD 4Не fusion and so-called nonradiative thermalization of the reaction in crystals. The dynamics of this process is considered. The assumption that the decay time of the compound nucleus depends on its excitation energy makes experiments in crystals compatible with the acceleration data. We consider the processes in the crystals that increase the intensity of DD fusion in comparison to the amorphous media, and the yield of the reaction is estimated. |
| 5182 | 2010-02-19 | Feasibility Study for the Realization of a Scientific Computing Service at the Laboratori Nazionali di Frascati of INFN –– Report of the Scientific Computing Service Working Group | 2010 | LNF-10-5(IR).pdf | M. Benfatto, S. Bianco, F. Bossi, V. Chiarella, S. Dell'Agnello, R. de Sangro (WG Chair), P. Di Nezza, M. L. Ferrer, E. Pace, L. Pellegrino, R. Ricci, F. Ronchetti, F. Terranova, E. Vilucchi | This document contains the final report of the working group set up to study the feasibility of a Scientific Computing Service at the INFN's Laboratori Nazionali di Frascati. The goal of the working group was to determine the location, infrastructure, hardware, software, manpower and funding profile needed to support the many computing activities of the experimental groups operating in the laboratory, including an ATLAS tier2 centre and an analysis farm for ALICE. |
| 5184 | 2010-02-19 | SPARX-FEL -- Technical Design Report (Version 2.00) Version 2.00 | 2010 | LNF-10-6(IR).pdf | AA VV | |
| 5181 | 2010-02-16 | A New Approach in Modeling the Response of RPC Detectors | 2010 | LNF-10-4(P).pdf | L. Benussi, S. Bianco, S. Colafranceschi, F.L. Fabbri, D. Piccolo, G. Saviano, A.K. Bhattacharyya, A. Sharma | The response of RPC detectors is highly sensitive to environmental parameters. A novel approach is presented to model the response of RPC detectors in a variety of experimental conditions. The algorithm, based on Artificial Neural Networks, has been developed and tested on the CMS RPC commissioning. |
| 5179 | 2010-02-09 | Technical Design Report of the Inner Tracker for the KLOE-2 experiment | 2010 | LNF-10-3(P).pdf | KLOE-2 Collaboration: F. Archilli, D. Badoni, D. Babusci, G. Bencivenni, C. Bini, C. Bloise,V. Bocci, F. Bossi,P. Branchini, A. Budano, S. A. Bulychjev, P. Campana, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwinski, E. Dan`e, E. De Lucia, G. De Robertis, A. De Santis, G. De Zorzi, A. Di Domenico, C. Di Donato, B. Di Micco, D. Domenici, M. Dreucci, O. Erriquez, G. Felici, S. Fiore, P. Franzini, P. Gauzzi, S. Giovannella, F. Gonnella, E. Graziani, F. Happacher,B. Hoistad, E. Iarocci,M. Jacewicz, T. Johansson, A. Kupsc, V. V. Kulikov, L. Kurdadze, J. Lee Franzini, F. Loddo, M. A. Martemianov, M. Martini, M. A. Matsyuk, D. Mchedlishvili, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, F. Nguyen, V. Patera, A. Passeri, L. Quintieri, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, B. Sciascia, A. Sciubba, M. Silarski, M. Tabidze, C. Taccini, L. Tortora, G. Venanzoni, R. Versaci, W. Wislicki, M. Wolke, J. Zdebik and A. Balla, S. Cerioni, M. Gatta, N. Lacalamita, S. Lauciani, R. Liuzzi, M. Mongelli, A. Pelosi, M. Pistilli, V. Valentino | The technical design report of the Inner Tracker for the KLOE-2 experiment is presented |
| 5180 | 2010-02-09 | Installation and Configuration of dCache Storage System with INFNGRID Profile for gLite Middleware | 2010 | INFN-TC-10-1.pdf | H. Riahi, F. Vella | The CMS experiment is expected to produce a few Peta Bytes of data per year and distribute them globally. Within the CMS computing infrastructure, some user tasks can be performed at level of CMS Tier-3 sites without any supports or sites reliability guaranteed by CMS collaboration. In this note, we present the integration of dCache storage system and Glite middleware to allow users to perform physics analysis. We describe briefly, in this paper, Perugia data center and its distinctive features with an overview of dCache and Glite middleware. We show in detail the followed steps and the solutions to possible problems. Finally, we describe perspectives in integrating dCache storage system with Glite middleware. |
| 5178 | 2010-02-05 | PORFIDO: Oceanographic Data for Neutrino Telescopes | 2010 | LNF-10-2(P).pdf | M. Cordelli, R. Habel, A. Martini, L. Trasatti | PORFIDO (Physical Oceanography by RFID Outreach) is a system designed to be installed in the optical modules of the NEMO experiment and possibly, in future underwater neutrino telescopes to gather oceanographic data with a minimum of disturbance to the main project and a very limited budget. The system gathers oceanographic data (temperature, etc.) from passive RFID tags (WISPs) attached to the outside of the NEMO optical modules with an RF reader situated inside the glass sphere, without the need of connectors or penetrators, which are very expensive and offer low reliability. Ten PORFIDOs will be deployed with the NEMO Phase 2 tower in 2011. |
| 5177 | 2010-02-04 | Optimization of a Linac-Based Neutron Source for Time-of-Flight Measurements | 2010 | LNF-10-1(P).pdf | S. Bartalucci, V. Angelov | The conceptual design of a neutron source for time-of-flight (TOF) measurements with good energy resolution was presented in a previous paper, aiming at its implementation on a high energy electron Linac . There is a growing interest in nuclear data worldwide and the existing neutron sources are clearly insufficient. The distinguished feature of this source is the very small size of the neutron producing target, what reduces the uncertainty on the neutron pathlength and so helps improve resolution. This in turn allows one to reduce the neutron flightpath down to only 1 m, in order to keep the flux at an acceptable level for a given energy resolution. Hence a special design of the shielding used for background reduction is needed, if compared to other similar sources. The basic criterion used in designing the various components was the optimization of the TOF resolution, and consequent background reduction, which were done mainly by extensive simulations with the MCNP5 code. The optimization results of the main elements of this source (target, moderator, shielding, collimator) are reported on in this paper, suggesting the feasibility of a simple, cheap and flexible neutron facility with an energy resolution ≤ 5% to be implemented even on a low power but high energy electron Linac. |
| 5176 | 2010-01-25 | The Design and Commissioning of the MICE Upstream Time-of-Flight System | 2010 | INFN-AE-10-1.pdf | R.~Bertoni, A.~Blondel, M.~Bonesini, G.~Cecchet, A.~de Bari, J.S.~Graulich, Y.~Kharadzov, M.~Rayner, I.~Rusinov, R.~Tsenov, S.~Terzo, V.~Verguilov | In the MICE experiment at RAL the upstream time-of-flight detectors are used for particle identification in the incoming muon beam, for the experiment trigger and for a precise timing ($\\sigma_t \\sim 50$ ps) with respect to the accelerating RF cavities working at 201 MHz. The construction of the upstream section of the MICE time-of-flight system and the tests done to characterize its individual components are shown. Detector timing resolutions $\\sim 50-60$ ps were achieved. Test beam performance and preliminary results obtained with beam at RAL are reported. |
| 5175 | 2009-12-23 | Chemical Analyses of Materials Used in the CMS RPC Muon Detector | 2009 | LNF-09-18(P).pdf | S. Bianco, S. Colafranceschi, D. Colonna, M. Giardoni, F. Felli, T. Greci, A. Paolozzi, L. Passamonti, D. Pierluigi, C. Pucci, A. Russo, G. Saviano, M. Abbrescia, R. Guida | Results are reported on a study of materials used in the CERN Closed Loop recirculation gas system presently under test with the RPC muon detectors in the CMS experiment at the LHC. Studies include a sampling campaign in a low-radiation environment (cosmic rays at the CERN ISR test site). We describe the dedicated RPC chamber tests, the chemical analysis of the filters and gas used, and discuss the results of the Closed Loop system. |
| 5174 | 2009-12-23 | Calcolo Scientifico: Prime Metodologie Quantitative per un Ambiente di Produzione | 2009 | INFN-CCR-09-6.pdf | A. Ciampa, E. Mazzoni | Vengono definiti il contesto e l’attività di Calcolo Scientifico, prendendo ad esempio la Sezione di Pisa, intesa come produzione, pensando ad un approccio di tipo industriale. Si propone una prima metodologia per la valutazione quantitativa dei livelli di produzione, dell’efficienza nell’utilizzo degli impianti e della distribuzione dei costi. La valutazione dei consumi e l’attribuzione dei costi sono basate sul consumo di energia elettrica: viene descritto come questo parametro possa essere considerato solo un esempio pratico e viene accennato a quali tipi di consumi, costi, modalità possa essere estesa l’applicazione della metodologia proposta. I risultati di un survey con applicazione alla Sezione di Pisa sono allegati in appendice |
| 5173 | 2009-12-21 | Optical Study of IR PRESSMAGO Collector | 2009 | LNF-09-17(IR).pdf | L. Gambicorti, F. Simonetti, A. Marcelli, D. Di Gioacchino, E. Pace, A. De Sio | A feasibility study of an optical system to concentrate and to focalize the synchrotron beam for the PRESS_MAG_O experiment of the Vth Committee of the INFN has been proposed. This report describes the study of a collector with two different configurations, to match the optical and mechanical requirements, obtaining performances that are in agree with the opto-mechanical constrains. During the study the requirements has been analyzed and the performances of collectors are described in collimated and non collimated beam. At the end a comparison between the performances of the solutions and conclusions are reported. |
| 5172 | 2009-12-18 | JAVA REF Framework | 2009 | LNF-09-16(NT).pdf | C. Bisegni | Gli applicativi di Gestione Ospiti e GOVA realizzati in ambito nazionale si basano su un framework custom per lo sviluppo di applicativi java a tre livelli. E’ composto da tre parti: Client, Common e Server. Integra un sistema di comunicazione in HTTP basato sulla libreria Apache HTTPClient (http://hc.apache.org/httpclient-3.x) e usa una servlet come entry-poiny per il server layer. Lo scopo del framework è quello di velocizzare lo sviluppo di sistemi software a tre livelli e di conseguenza lo sviluppo di business logic (processi applicativi) nel middle-tier e renderne veloce la pubblicazione e l’esecuzione tramite protocollo |
| 5171 | 2009-12-03 | The Time Resolved Positron Light Emission (3+L) Experiment: A Novel Diagnostics Tool for the DAFNE Positron Ring | 2009 | LNF-09-15(R).pdf | A. Bocci, M. Cestelli Guidi, A. Clozza, A. Drago, A. Grilli, A. Marcelli, A. Raco and R. Sorchetti, L. Gambicorti, A. De Sio, E. Pace | |
| 5169 | 2009-11-30 | Quest for precision in Hadronic Cross Sections at Low Energy: Monte Carlo tools vs. Experimental data. (Working Group on Radiative Corrections and Monte Carlo Generators for Low Energies) | 2009 | S. Actis, A. Arbuzov, G. Balossini, P. Beltrame, C. Bignamini, R. Bonciani, C. M. Carloni Calame, V. Cherepanov, M. Czakon, H. Czy˙z, A. Denig, S. Eidelman, G. V. Fedotovich, A. Ferroglia, J. Gluza, A. Grzeli´nska, M. Gunia, A. Hafner, F. Ignatov, S. Jadach, F. Jegerlehner, A. Kalinowski, W. Kluge, A. Korchin, J. H. Kuhn, P. Lukin, P. Mastrolia, G. Montagna, S. E. Muller, F. Nguyen, O. Nicrosini, D. Nomura, G. Pakhlova, G. Pancheri, M. Passera, A. Penin, F. Piccinini, W. Placzek, T. Przedzinski, E. Remiddi, T. Riemann, G. Rodrigo, P. Roig, O. Shekhovtsova, C. P. Shen, A. L. Sibidanov, T. Teubner, L. Trentadue, G. Venanzoni, J. J. van der Bij, P. Wang, B. F. L. Ward, Z. Was, M. Worek, and C. Z. Yuan | We present the achievements of the last years of the experimental and theoretical groups working on hadronic cross section measurements at the low energy e+e− colliders in Beijing, Frascati, Ithaca, Novosibirsk, Stanford and Tsukuba and on τ decays. We sketch the prospects in these fields for the years to come. We emphasize the status and the precision of the Monte Carlo generators used to analyse the hadronic cross section measurements obtained as well with energy scans as with radiative return, to determine luminosities and τ decays. The radiative corrections fully or approximately implemented in the various codes and the contribution of the hadronic vacuum polarisation are discussed. | |
| 5170 | 2009-11-30 | Load Test on the EMCAL Module Frame | 2009 | INFN-TC-09-10.pdf | F. Noto, A. Palmeri | A consortium of French, Italian and US institutions is constructing a large electromagnetic calorimeter (EMCal ), which will complete the ALICE detector capabilities for measuring the entire range of physics observables in heavy ion interactions. Jet quenching, the interaction of energetic partons with dense matter, has been shown at RHIC to provide a broad range of unique and sensitive probes of the hot QCD medium. Jet quenching will play an equally important role in the LHC heavy ion physics program. The EMCal enables ALICE to explore the physics of jet quenching in detail, over the large kinematic range provided in heavy by the LHC. |
| 5168 | 2009-11-25 | Manuale di Installazione di un Servizio di Posta Elettronica Completo di Filtri Anti-Virus e Anti-Spam con Politica di Implementazione OPT-OUT | 2009 | INFN-TC-09-9.pdf | A. D’Ambrosio | Con la seconda ristrutturazione dei servizi di calcolo centrali della Sez. INFN di Torino e dei Dipartimenti di Fisica dell’Università, considerato il notevole aumento della frazione di spam sul totale di E-Mail consegnate agli utenti, a Settembre 2007 si è colta l’occasione per modificare la politica di implementazione dei filtri anti-spam/virus da OPT-IN ad OPT-OUT, con inasprimento di alcune funzionalità di default rispetto al progetto iniziale (INFN/TC-05/09 del 01/07/2005), per redigerne un manuale dettagliato di installazione. Le istruzioni qui contenute hanno validità generale per qualunque piattafor-ma Unix. |
| 5167 | 2009-11-19 | Ground Motion Measurements at LNF | 2009 | LNF-09-13(P).pdf | B. Bolzon, L. Brunetti, M. Esposito, A. Jeremie, U. Rotundo, S. Tomassini | Preliminary measurements of ground motion have been done at the LNF for Super B site characterization. Measurements done during 18 hours in the vertical direction near a main road on surface show that earth motion (from 0.2Hz to 1Hz) is around 70nm, and that cultural noise (from 1Hz to 100Hz) varies from about 12nm to 35nm between 17h40 and 8h00 and from 38nm to 65nm between 09h40 and 11h40 on average, but highly increases between 8h00 and 09h40 due to traffic of rush hours ([3; 30] Hz) up to 240nm. However, measurements done during 20 minutes simultaneously on the surface and a 50m depth hole show that cultural noise is well attenuated in depth on its entire bandwidth (from 1Hz up to at least 100Hz). Vertical ground motion measured for 20 minutes in three other points located near various vibration sources during non rush hours the day was shown to be almost the same, about 70-80nm from 0.2Hz to 100Hz and about 30-35nm from 1Hz to 100Hz on average. Also, ground motion measurements done during 20 minutes simultaneously in the three directions at two points (located also near different vibration sources) show that horizontal motion is not much higher than vertical motion compared to horizontal tolerances which should be much less strict than the vertical one. To finish, measurements of ground motion coherence has been done for different distances on two different floors close to each other at LNF (soft and rigid) and compared to the one of ATF2 where a special floor was built for stability. Results confirm that a rigid floor keeps the coherence at higher frequencies, and that the LNF floor is much better than the one of ATF2 although it was not built for stability. |
| 5166 | 2009-11-13 | Finite Element Model of the Cylindrical GEM Detector as New Inner Tracker of Kloe2 and Mechanical Characterization of the Employed Materials | 2009 | LNF-09-12(IR).pdf | L. Quintieri, G. Bencivenni, A. Ceccarelli, S. Cerioni, S. Lauciani, D. Domenici, M. Pistilli | In this report we describe the study of the mechanical behavior of the cylindrical GEM detector to be used as new inner tracker for the Kloe2 experiment. The measurements of the tensile tests, that we did to characterize the mechanical properties of the non conventional materials used for the detector, are accurately described. At the end of the experimental tests, we were able to derive the Elasitcity Modulus values for each material and accurately reconstruct the correspective $\\sigma(\\epsilon)$ curves. These experimental values have been used to perform 3-D simulations (by Ansys code) of the non-linear structural response of the detector under several tensile loads, in order to estimate the entity of the consequently induced strain and stress. One of the main objectives of this work, in fact, consists in the realization of a valuable computational tool that allows to foresee and analyze the mechanical response of the GEM detector to specified loads and boundary conditions. In order to be confident in the reliability of the simulation results, a validation against experimental well-know configurations has been done. The comparison between the finite element code predictions with the experimental results is discussed. |
| 5165 | 2009-10-26 | A Twin-Laser System Driving a Powerful Inverse Compton X-ray Source | 2009 | INFN-TC-09-8.pdf | I. Boscolo | The basics of a complete twin-laser system driving both the LINAC accelerator and the interaction chamber of a powerful inverse Compton source is discussed. The pourpose is the production of trains of 100 pulses, 10 ps long, with an internal frequency of 100 MHz at a repetition rate of 10 Hz. The pulse energy of the egun-laser, the one driving the accelerator photocathode, is about 10 $\\mu J$, while the Compton-laser, the one driving the interaction chamber, is 1 J. The egun-laser is conceptually based on a powerful Nd:YAG(YLF) oscillator seeded by a saturated laser pulse. The Compton-laser is based on a commercial 1 J-15 ps-10 Hz Nd:YAG(YLF) coupled to a passive enhacing cavity which can generate the pulse trains. The energy and brilliance of the two lasers are discussed in view of producing an X-ray source capable of delivering more than $10^{10}$ photons p |
| 5163 | 2009-10-23 | Riflessioni sulla Virtualizzazione | 2009 | INFN-CCR-09-5.pdf | Alberto Ciampa | Proposta di un semplice contesto metodologico per la valutazione degli ambiti applicativi nei quali introdurre la virtualizzazione. Vengono presentati e brevemente analizzati quattro scenari: worker nodes on demand, virtualizzazione per high availability, farm on demand e virtualizzazione per interattivo. Si conclude con la presentazione della proposta per il coinvolgimento della Sezione di Pisa nel Gruppo di Virtualizzazione. |
| 5164 | 2009-10-23 | Investigation of the Temperature Dependence of Avalanche Photo Diodes for the Alice Electromagnetic Calorimeter | 2009 | INFN-TC-09-7.pdf | A. Badalà, P. La Rocca, G.S. Pappalardo, C. Petta, A. Pulvirenti, F. Riggi | This report briefly describes the temperature dependence of the avalanche photo diodes installed in the ALICE electromagnetic calorimeter. Such aspect is important, since these devices will work at ambient temperature inside the L3 magnet, thus suffering considerable temperature changes during the data-taking. Additional tests carried out on the APDs before their final installation showed the possibility to accurately study the temperature dependence and find a suitable parameterization to foresee the APD behaviour for different conditions of temperature and gain. |
| 5162 | 2009-10-20 | Criteri di Progettazione degli Impianti Elettrici per l’Alimentazione dei Centri di Calcolo TIER2 | 2009 | INFN-CCR-09-4.pdf | Ruggero Ricci | Il presente elaborato riporta le linee guida per la progettazione degli impianti elettrici dei centri di calcolo di TIER2 dell’INFN. Vengono esaminati alcuni provvedimenti impiantistici per il miglioramento della continuità del servizio delle apparecchiature elettroniche di calcolo in relazione alle esigenze di funzionamento dei TIER2. |
| 5161 | 2009-10-15 | Flussi Misurati di Protoni ed Elio e l'Origine del Ginocchio nello Spettro della Radiazione Cosmica | 2009 | INFN-TC-09-6.pdf | Antonio Codino | Si esaminano concisamente le osservazioni dei ginocchi degli spettri in energia di protoni ed elio nell'intervallo 10$^{15}$-10$^{17}$ eV effettuati dagli esperimenti Eas-top e Kascade nonch\\'e la coerenza generale dei risultati ottenuti. \\\\ Bench\\'e sussistano differenze nei flussi dei singoli ioni e nella forma degli spettri osservati causate dalle varie procedure adottate nell'analisi dati, alcune caratteristiche basilari degli spettri misurati permettono di discriminare le teorie esistenti sull'origine e la natura del ginocchio e dei ginocchi dei singoli ioni nello spettro della radiazione cosmica primaria. \\\\ Si prova che le propriet\\`a misurate degli spettri dei protoni oltre 10$^{16}$ eV sono in disaccordo con il meccanismo di accelerazione diffusivo con onde d'urto nei resti di supernova che prevede un crollo di efficienza accelerativa degli ioni cosmici con l'energia oltre 10$^{15}$ eV. Il disaccordo \\`e quantificato in una differenza di 3 ordini di grandezza a 10$^{17}$ eV tra flussi osservati di protoni e flussi previsti.\\\\ Le caratteristiche osservate degli spettri di protoni oltre 10$^{15}$ eV costituiscono un risultato conclusivo per la spiegazione dell'origine e la natura del ginocchio dello spettro della radiazione cosmica secondo la recente {\\it Teoria degli Indici Spettrali Costanti} dove i ginocchi e il ginocchio, essendo estranei a qualsivoglia meccanismo accelerativo, sono effetti della propagazione dei raggi cosmici galattici, legati alle dimensioni finite del disco, alla forma e intensit\\`a del campo magnetico, alla posizione del sistema solare nella Via Lattea e alla quantit\\`a di gas nel mezzo interstellare. |
| 5160 | 2009-10-13 | Accelerators R&D | 2009 | LNF-09-11(P).pdf | C. Biscari | R&D on particle accelerators dedicated to high energy physics applications are reviewed. Progress in particle colliders follows two different paths, one aiming at increasing the available energy in collision, the other at increasing the luminosity. Present collider performances and their plans on both fronts for the next future are described, together with the ideas and the technologies being developed for the projects that will be built after LHC. Neutrino beam facilities and plans for plasma wakefield accelerators are mentioned. |
| 5159 | 2009-09-30 | Concept of DD Fusion In Crystals | 2009 | LNF-09-10(P).pdf | E. N. Tsyganov | This article addresses the yields of products of the reaction and the so-called non-radiation thermalization of D+D fusion in crystals. Concept of the process is proposed. |
| 5155 | 2009-09-11 | Measurement of the Luminosity at the DAFNE Collider Upgraded with the Crab Waist Scheme | 2009 | LNF-09-9(P).pdf | M. Boscolo, F. Bossi, B. Buonomo, G. Mazzitelli, F. Murtas, P. Raimondi, G. Sensolini, M. Schioppa, F. Iacoangeli, P. Valente, N. Arnaud, D. Breton, L. Burmistrov, A. Stocchi, A. Variola, B. Viaud, P. Branchini | The test of the crab waist collision scheme, undergoing at the e+e- Frascati DAFNE accelerator complex since February 2008, requires a fast and accurate measurement of the absolute luminosity, as well as a full characterization of the background conditions. Three different monitors, a Bhabha calorimeter, a Bhabha GEM tracker and a gamma bremsstrahlung proportional counter have been designed, tested and installed around the interaction point end of 2007-beginning of 2008. In this paper, we describe these detectors and present their performances in various operation conditions during the 2008 and 2009 DAFNE runs. |
| 5154 | 2009-07-31 | Il Ginocchio Nudo del Ferro, sua Necessità ed Evidenza Empirica | 2009 | INFN-TC-09-5.pdf | Antonio Codino | Lo spettro in energia della radiazione cosmica ha un piegamento ripido intorno a (5-7)x1017 eV scoperto dall’esperimento Akeno nel 1992 noto come secondo ginocchio. Avvalendosi di una recente teoria che spiega quantitativamente le proprietà del ginocchio e della caviglia viene identificata la natura del secondo ginocchio e se ne determinano le caratteristiche misurabili. Si prova che il secondo ginocchio corrisponde alla caduta di flusso del ferro oltre 1017 eV. Tale caduta è scolpita nello spettro dei raggi cosmici con il valore massimo dell’indice spettrale di 3.3, marchio distintivo unico del medesimo spettro nel grande intervallo di energia 1010-5x1019 eV. Si evidenzia come il secondo ginocchio si relaziona alle maggiori strutture misurate dello spettro dei raggi cosmici in modo peculiare e soprattutto misurabile: (A) il valore massimo dell’ indice spettrale di 3.3; (B) la peculiare banda di energia di (5-7)x1017 in cui l’indice assume il valore massimo di 3.3; (C) la sua posizione relativa in energia rispetto al ginocchio nominale del protone a 4x1015 eV (D) l’esistenza della caviglia e la sua posizione a 4x1018 eV successiva al secondo ginocchio lungo l’asse dell’energia; (E) la composizione chimica dei raggi cosmici dominata dal ferro nella regione (5-7)x1017 eV del secondo ginocchio. Le proprietà A, B, C e D sono in accordo con i dati sperimentali mentre la proprietà E solo con una parte di essi essendoci discrepanze notevoli nelle misure tra esperimenti diversi. |
| 5153 | 2009-07-20 | Thermal Equilibrium of Light Contaminant Atoms in a Crystal | 2009 | LNF-09-8(P).pdf | E. N. Tsyganov | This article addresses aspects of thermal equilibrium of light contaminant atoms in crystals. Long-wavelength lattice vibrational motion interactions with contamination of light atoms are considered. |
| 5151 | 2009-07-06 | Il “GRID Data Center” dell’INFN di Pisa | 2009 | INFN-CCR-09-2.pdf | Silvia Arezzini, Tommaso Boccali, Federico Calzolari, Alberto Ciampa, Simone Marini, Enrico Mazzoni, Subir Sarkar, Sonia Taneja, Giuseppe Terreni | La candidatura della Sezione INFN di Pisa come membro del consorzio italiano dei Tier 2 di CMS è stata proposta nel Giugno 2005. Partendo dall’inizio del commissioning avvenuto alla fine del 2006, si descrive l’attuale stato di ciò che, nel corso del progetto, è divenuto un “GRID Data Center”. Tale descrizione è organizzata tematicamente seguendo quelle che sono le diverse componenti del centro: infrastrutture, calcolo (farm), rete, storage e organizzazione GRID. Si conclude descrivendo le attività progettuali in corso e la direzione che si intende seguire per lo sviluppo futuro. |
| 5152 | 2009-07-06 | INFN-Pisa Network and Storage Scenario for LHC TIER 2 and GRID Data Center | 2009 | INFN-CCR-09-3.pdf | Silvia Arezzini, Alberto Ciampa, Tommaso Boccali, Enrico Mazzoni | Based on the specifications provided by the CMS Experiment, the Network and Storage requirements for a Tier 2 site (T2) are analyzed. A proposal for a possible solution is presented and discussed, targeted to the Pisa CMS T2 site. In the analysis, the current situation of the Pisa Grid Data Center is taken as a starting point, and the future growing path is taken into account for the next couple of years. Two different final architectures are presented. |
| 5150 | 2009-06-25 | Dynamics of Bound State Populations for Channeled Electrons/Positrons | 2009 | LNF-09-7(IR).pdf | A. Babaev, and S.B. Dabagov | When electrons or positrons are planar channeled through a crystal, the spectrum of bound energy states forms and one can observe so-called channeling radiation. The intensity of channeling radiation depends on populations of bound energy levels. These populations change during projectiles motion through a crystal that, in turn, influences the CR intensity. In this manuscript we present theoretical model and computer codes to investigate the bound energy spectra of planar-channeled electrons and positrons and to obtain the initial populations of bound states. Solving the kinetic equations and using some approximations we explore the dynamics of bound state populations. In the future taking into account the dechanneling processes more realistic picture of evolution of bound state populations will be giving. |
| 5149 | 2009-06-11 | A Photo-Neutron Facility for Time-of-Flight Measurements | 2009 | LNF-09-6(IR).pdf | S. Bartalucci, Vl. Angelov, K. Drozdowicz, D. Dworak, G. Tracz | The accelerator-based neutron sources, which are driven by electron Linacs, still appear quite attractive, notably because of their use in the cross section measurements with the time-of-flight method. This is due to their better beam quality and economy aspects, what make them complementary, and in some case even superior to the hadron (protons, deuterons) driven spallation facilities. A conceptual design study of a powerful neutron source has been developed, aiming at the implementation on a future normal- or super-conducting Linac to be built in the Rome Research Area, but keeping enough flexibility for being installed on any high energy linac. The uniqueness of this source in Italy because of its white neutron spectrum and high TOF resolution has to be stressed. A general description of the facility in given in this report , with an illustration of the scientific case, of the main physical and technical issues that affect the source optimum design, and a tentative estimate of the costs and time scheduling required. |
| 5148 | 2009-05-15 | Technical Design Report of a Superconducting Model Dipole for FAIR SIS300 | 2009 | INFN-TC-09-4.pdf | F. Alessandria, S. Angius, G. Bellomo, P. Fabbricatore, S. Farinon, U. Gambardella, R. Marabotto, R. Musenich, R. Repetto, M. Sorbi and G.Volpini | This report deals with the R&D activities aimed at developing the high field rapidly-cycling super-conducting dipoles needed for SIS300 synchrotron of the FAIR facility at GSI. The present lattice design includes 48 long dipoles with magnetic length 7.757 m and 12 short dipoles with magnetic length 3.879 m. The coils have two main features: they are curved (the corresponding sagitta is 112.8 mm for long dipoles), and they are fast ramped (for a superconducting magnet). Both these characteristics demand a challenging R&D, aimed at the development of the required low loss conductor, a robust design with respect to fatigue issues and a suitable winding technology. The Italian National Institute of Nuclear Physics (INFN) is performing this R&D. A project, called DISCORAP (“Dipoli SuperCOnduttori RApidamente Pulsati”), started in 2006 in accordance with a specific INFN-FAIR Memorandum of Understanding signed by both institutions in December 2006. The aim is to have a complete cold mass model of the short dipole ready in the summer of 2009. After a preliminary test of the cold mass in a vertical cryostat, it will be integrated into a horizontal cryostat for a test series at GSI. |
| 5147 | 2009-05-05 | Design and Implementation of the gLite CREAM Job Management Service | 2009 | INFN-TC-09-3.pdf | Cristina Aiftimiei, Paolo Andreetto, Sara Bertocco, Simone Dalla Fina, Alvise Dorigo, Eric Frizziero, Alessio Gianelle, Moreno Marzolla, Mirco Mazzucato, Massimo Sgaravatto, Sergio Traldi, Luigi Zangrando | Job execution and management is one of the most important functionality provided by every modern Grid middleware. In this paper we describe how the problem of job management has been addressed in the gLite middleware by means of the CREAM and CEMonitor services. CREAM (Computing Resource Execution and Management) provides a job execution and management capability for Grid systems, while CEMonitor is a general-purpose asynchronous event notification framework. Both services expose a Web Service interface allowing conforming clients to submit, manage and monitor computational jobs to a Local Resource Management System. |
| 5145 | 2009-04-16 | Centralizzazione del Servizio di Posta Elettronica per l’INFN | 2009 | INFN-CCR-09-1.pdf | M. Corosu, F. Costa, O. Pinazza, A. Spanu, R. Veraldi, G. Vita Finzi | Questa ricerca è stata affidata al gruppo Mailing dalla Commissione Calcolo e Reti, con lo scopo di indagare i diversi aspetti di un possibile servizio di posta centralizzato. Nelle sedi i servizi calcolo sono oggi impegnati a fornire lo stesso servizio di posta, quasi replicato, con grande impegno di personale e risorse. I vantaggi della centralizzazione del servizio sono evidenti: oltre a liberare i servizi dal carico di lavoro legato al servizio di posta, si utilizzerebbero le risorse hardware in modo più ottimizzato e si potrebbero implementare politiche di servizio, antispam e antivirus uniformi e più efficaci. Restano però ancora alcuni dubbi sulla convenienza di questa eventuale riorganizzazione: la grande complessità introdotta in un servizio sempre più critico, i costi elevati, la gestione del traffico locale e dell’allarmistica. La scelta dei sistemi e delle possibili soluzioni ha come presupposti: - che il livello di servizio fornito sia uguale o superiore a quello attuale - che il sistema possa essere integrato nell’infrastruttura di AAI - che l’erogazione del servizio centralizzato liberi effettivamente il personale dei servizi dal carico di lavoro legato alla posta elettronica (sistemistico e di helpdesk) Le soluzioni commerciali che soddisfano queste richieste sono di due tipi: - quelle che offrono le caselle di posta e gli strumenti per l’amministrazione ed ospitano e gestiscono l’hardware in maniera trasparente per il cliente, e costano circa 50 € per utente/anno (es. Google Apps) - quelle che gestiscono il sistema ospitato presso il cliente, con costi simili alla soluzione precedente (Oracle, IBM) o non quantificabili a priori (es. Microsoft), ma comunque elevati. A costi decisamente minori, una soluzione opensource gestita completamente dall’INFN risulta tecnicamente complessa anche se non impossibile; richiede però l’identificazione di uno o più siti dove allestire l’infrastruttura necessaria, la progettazione, l’acquisto, l’installazione e la gestione di un sistema hardware scalabile e ad alta affidabilità e l’istituzione di un apposito servizio con personale specializzato per la gestione e manutenzione del servizio e per l’helpdesk. L’introduzione del Metodo a Gerarchia Analitica (AHP: Analytic Hierarchy Process) ha permesso di valutare con criteri qualitativi, oltre che quantitativi, e secondo pesi diversi, le diverse alternative, confermando che l’attuale soluzione distribuita è tutt’ora la più adatta alle esigenze di servizio dell’Ente. |
| 5146 | 2009-04-16 | Papers presented at EPAC 2008 | 2009 | LNF-09-5(P).pdf | Accelerator Division | |
| 5144 | 2009-04-08 | Study of the Bernstein Waves Heating in the WEGA Stellarator Plasma and Possible Applications to ECRIS – ECR Ion Sources | 2009 | INFN-FM-09-1.pdf | H. Laqua, M. Otte, Y. Podoba, D. Mascali, S. Gammino, L. Celona, F. Maimone, G. Ciavola, R. Miracoli, N. Gambino | The Electron Cyclotron Resonance Ion Sources (ECRIS) are nowadays the most effective devices that can feed the particle accelerators in a continuous and reliable way, providing high current beams of multiply charged ions. The heating mechanism of the ECRIS plasma is based on the Electron Cyclotron Resonance, that is able to create multi-keV electrons useful for ionization and to produce a conspicuous number of electrons up to MeV energies, as demonstrated by recent experiments on 3rd generation sources. These electrons are completely useless for the production of highly charged ions (their ionization cross section is very low) and they are also detrimental for the source safety, because they increase the heat load on the superconducting magnets’ cryostat, making the magnets operations problematic. With the aim to study alternative plasma heating mechanisms for ECRIS, a series of experimental measurements have been carried out at Max Planck Institute for Plasma Physics of Greifswald, where a Stellarator for nuclear fusion research operates. In the last years it has been demonstrated that the Stellarator plasma can be efficiently heated by means of electrostatic Bernstein waves (BW), generated through an electromagnetic to electrostatic mode conversion mechanism named “OXB-conversion”. We will show that a proper BW-heating strongly reduces the number of high energy electrons over a large range of pressure and power. A possible injection scheme for ECRIS-like devices has been designed on this basis and it will be proposed along with a preliminary modelling of the waves to plasma coupling and wave’s path and absorption via OXB-conversion in ECR ion sources. |
| 5143 | 2009-04-03 | 2008 ANNUAL REPORT | 2009 | LNF-09-4(IR).pdf | AA.VV | |
| 5142 | 2009-03-19 | Splitter Box per l’Esperimento CORMORAD | 2009 | INFN-TC-09-2.pdf | Marco Battaglieri, Gabriele Firpo, Massimo Ivaldi, Fabio Pratolongo | In questa nota si descrive il progetto di uno Splitter box attivo per segnali analogici veloci realizzato per l’esperimento CORMORAD ed i test di verifica e funzionamento su di esso condotti. I test sono stati eseguiti sia sul prototipo di laboratorio sia con la versione definitiva inserita nella DAQ dell’esperimento. Tutti i test hanno dimostrato la conformità del funzionamento alle specifiche di progetto. |
| 5140 | 2009-03-18 | Simulations of off-momentum particle trajectories along Dafne optics | 2009 | LNF-09-3(IR).pdf | L. Quintieri, D. Babusci, F. Archili, D. Moricciani, R. Messi | The principal aim of this work is the study of the off-momentum particles along the Da$\\phi$ne Optics. We did the tracking of all those particles that are supposed to be generated in one of the two Interactions Points, as a result of the collisions between electrons and positrons that do not success to produce $\\Phi$ particles. The majority of these particles are destined to die along the machine path, impinging on the vacuum chamber, generating secondary particle showers. In order to evaluate correctly the points along the line on which the off-momentum particles are lost and to estimate successively their contribution to the background around the Interaction Region of Da$\\phi$ne, we used the BDSIM code. This code conjugates the capabilities of fast particle tracking in accelerators, as more standard optics codes do (MAD), with that of simulating, by means of Monte Carlo techniques, the interaction of the lost particles with matter. All the results of the analysis developed up to now are illustrated in this note. The results of this analysis are useful for defining the suitable locations along the Da$\\phi$ne optics of the $\\gamma\\gamma$ tagger detectors, in the frame of the Kloe2 program for studying the $\\gamma\\gamma$ Physics at Da$\\Phi$ne. |
| 5137 | 2009-02-13 | Cuore Experiment: Towers’ Construction System | 2009 | INFN-TC-09-1.pdf | Valerio Pettinacci, Silvio Morganti, Antonio Zullo | CUORE experiment, predicted to be installed at “Gran Sasso” National Lab, consists in a detector placed inside a large cryostat. This detector is composed by 1000 very pure crystals, organized in a 20 copper towers system. The main problem of this assembly, is to integrate these towers, keeping a radioactively pure environment around crystals and copper frames, in order to don’t compromise the detector functionality. This job describes how has been decided to proceed, in the LNGS clean room, for the tower’s assembly. |
| 5134 | 2009-02-02 | Deep Inelastic Processes and the Equations of Motion | 2009 | INFN-AE-09-1.pdf | Elvio Di Salvo | We show that the Politzer theorem on the equations of motion implies approximate constraints on the quark correlator, restricting considerably, for sufficiently large $Q^2$, the number of independent distribution functions that characterize the internal structure of the nucleon, and of independent fragmentation functions. This result leads us to suggesting an alternative method for determining transversity. Moreover our approach implies predictions on the $Q^2$-dependence of some azimuthal asymmetries, like Sivers, Qiu-Sterman and Collins asymmetry. Lastly, we discuss some implications on the Burkhardt-Cottingham and Efremov-Leader-Teryaev sum rules. |
| 5133 | 2009-01-15 | Deuteron Electromigration in Thin PdWires CoatedWith Nano-Particles: Evidence for Ultra-Fast Deuterium Loading and Anomalous, Large Thermal Effects | 2009 | LNF-09-1(P).pdf | F. Celani, P. Marini, V. Di Stefano, A. Spallone, M. Nakamura, E. Purchi, O. M. Calamai , V. Andreassi, E. Righi, G. Trenta, A. Marmigi, G. Cappuccio, D. Hampai, F. Todarello, U. Mastromatteo, A. Mancini, F. Falcioni, M. Marchesini, P. Di Biagio, U. Martini, P. G. Sona, F. Fontana, L. Gamberale, D. Garbelli | Large excess heat is measured in a Pd wire coated with nano-particles. A long (65 cm) and thin (50 μm) Pd wire is coated with thin layers of Pd nano-particles, stabilized against self-sintering by the addition of selected chemical elements: the coating is adhered to the wire surface by heating it in air up to about 800°C. The wire is then heated with up to 1 A of direct current in a pressurized D2 gas atmosphere. The D+ deuterons in the Pd lattice are forced to move toward the cathodic end of the wire because of the voltage drop along the wire (the Cöhn effect). Large excess power density (about 400 W/g of Pd), at high temperatures (up to 400-500°C), is then measured using isoperibolic calorimetry. The reference experiment is made, in situ and without opening the cell, using a Pt wire of same dimensions as the Pd wire, to which was applied the same electrical power. The onset of excess heat occurs in during a phase change from an α + β combined phase of the Pd-D to the α phase, and is proportional to the current density, and to the corresponding voltage drop or input power applied, i.e. the Pd temperature. In the range of temperatures explored up to now, the excess power has exhibited “positive feedback” behaviour versus temperature. This may prove useful to developing future self-sustaining devices for practical applications. No anomalous effects were found using 4He (or Ar, or dry-air) gases. |
| 5130 | 2008-12-22 | Worker Node per il Calcolo LHC | 2008 | INFN-CCR-08-2.pdf | Michele Michelotto | Questo documento descrive il panorama dei processori disponibili sul mercato per i nodi di calcolo (Worker Node) nei prossimi mesi. La valutazione delle prestazioni dei processori in questo momento di transizione tra SPEC INT 2000 e un altro benchmark, probabilmente della suite SPEC CPU 2006, risulta alquanto problematica poiché vengono usati vecchi e nuovi benchmark, con dati in parte pubblicati e in parte misurati. Il documento si conclude con una tabella in cui si evidenziano le prestazioni delle macchine attuali e di quelle delle generazioni precedenti in termini di SI2k e SPEC INT 2006 in attesa della scelta di WLCG come benchmark di riferimento per il futuro. Infine sono riportati i prezzi di alcuni medi acquisti di Worker Node (taglia tipica dei Tier2) degli ultimi mesi nell'intento di valutare i prezzi per gli acquisti futuri (2009). |
| 5131 | 2008-12-22 | Rapporto sull’Attività Svolta nei due Corsi INFN per la Formazione GRID – Martina Franca (TA) 5-9 E 12-23 Novembre 2007 | 2008 | INFN-CCR-08-3.pdf | Valeria Ardizzone, Antonio Calanducci, Emidio Giorgio | |
| 5135 | 2008-12-22 | An analysis of materials used in the RPC detector and in the closed loop gas system of CMS at the LHC | 2008 | LNF-08-33(IR).pdf | S. Bianco, S. Colafranceschi, D. Colonna, T. Greci, A. Paolozzi, L. Passamonti, D. Pierluigi, C. Pucci, A. Russo, G. Saviano, M. Abbrescia, R. Guida | The results are reported of the study of materials used in the CERN Closed Loop recirculation gas system currently under test with the RPC muon detectors in the CMS experiment at the LHC. Studies include a sampling campaign in a low-radiation environment (cosmic rays at the CERN ISR test site). We describe the dedicated RPC chamber tests, the chemical analysis of the filters and gas used, and discuss the results of the Closed Loop system. |
| 5132 | 2008-12-22 | Integrare il Calcolo Locale MPI nella FARM INFN-GRID | 2008 | INFN-CCR-08-4.pdf | Roberto Alfieri, Roberto Covati e Enrico Tagliavini | Si descrive l'esperienza di integrazione dei cluster locali utilizzati per il calcolo MPI presso il Gruppo Collegato di Parma nella farm Grid. Tale integrazione è stata realizzata in modo tale da garantire un accesso prioritario e trasparente alle risorse per gli utenti locali ma nel caso in cui tali risorse risultino inutilizzate è stato previsto il loro riutilizzo per job MPI provenienti dagli utenti di InfnGrid. Vengono inoltre analizzate le problematiche legate all'introduzione del tool mpi-start per la gestione contemporanea di diversi flavor di MPI. |
| 5128 | 2008-12-15 | Scheda DWFD dell’Esperimento EXPADES | 2008 | INFN-TC-08-10.pdf | A. Anastasio, A. Pandalone, A. Vanzanella | Questa nota descrive il modulo Digital WaveForm Digitizer (DWFD) da noi sviluppato per l’esperimento EXPADES. Ciascun modulo DWFD si interfaccia con otto chip ASIC full custom (SER_09) appositamente sviluppati in tecnologia CMOS da 0.35 micron per il front end dell’esperimento EXPADES e provvede sia alla formazione dei segnali per la logica di trigger sia alla campionatura e memorizzazione degli ingressi in una memoria di evento per la successiva determinazione del canale interessato dall’Hit e alla sua durata. I moduli DWFD si basano sulle FPGA Virtex IV (XC4VFX12-10FF668) di ultima generazione della Xilinx. |
| 5129 | 2008-12-15 | Uso dei Sensori in Fibra Ottica per Applicazioni Aerospaziali e per i Rivelatori dell’Esperimento CMS | 2008 | LNF-08-32(Thesis).pdf | Stefano Colafranceschi | |
| 5127 | 2008-12-09 | QCD and Total Cross-Sections : Photons and Hadrons | 2008 | R.M. Godbole, A. Grau, G. Pancheri and Y.N. Srivastava | In this contribution, we discuss total cross-section model which can be applied to both photon and purely hadronic processes. We find that the model can reproduce photo-production cross-sections with minimal modifications from the proton case. We also discuss how the model could accomodate extrapolation of !! p processes to ! p using Vector Meson Dominance models. | |
| 5124 | 2008-12-04 | Total Photo-Production Cross-Section at Very High Energy | 2008 | LNF-08-28(P).pdf | R.M. Godbole, A. Grau, G. Pancheri, and Y.N. Srivastava | In this paper we apply to photoproduction total cross-section a model we have proposed for purely hadronic processes and which is based on QCD mini-jets and soft gluon re-summation. We compare the predictions of our model with the HERA data as well as with other models. When we extend the model to cosmic ray energies, our model predicts substantially higher cross-sections at TeV energies than models based on factorization but lower than models based on mini-jets alone, without soft gluons. We discuss the origin of this difference and comment on the Froissart bound for photon induced processes. |
| 5125 | 2008-12-04 | The CMS RPC Gas Gain Monitoring System: an Overview and Preliminary Results | 2008 | LNF-08-29(P).pdf | L.~Benussi, S.~Bianco, S.~Colafranceschi, D.~Colonna, L.~Daniello, F.~L.~Fabbri, M.~Giardoni, B.~Ortenzi, A.~Paolozzi,, L.~Passamonti, D.~Pierluigi, B.~Ponzio, C.~Pucci, A.~Russo, G.~Roselli, A.~Colaleo, F.~Loddo, M.~Maggi, A.~Ranieri, M.~Abbrescia, G.~Iaselli, B.~Marangelli, S.~Natali, S.~Nuzzo, G.Pugliese, F.~Romano, R.~Trentadue, S.~Tupputi, R.~Guida, G.~Polese, N.~Cavallo, A.~Cimmino, D.~Lomidze, P.~Noli, D.~Paolucci, P.~Piccolo, C.~Sciacca, P.~Baesso, M.~Necchi, D.~Pagano, S.~P.~Ratti, P.~Vitulo, C.~Viviani | The status of the CMS RPC Gas Gain Monitoring (GGM) system developed at the Frascati Laboratory of INFN (Istituto Nazionale di Fisica Nucleare) is reported on. The GGM system is a cosmic ray telescope based on small RPC detectors operated with the same gas mixture used by the CMS RPC system. The GGM gain and efficiency are continuously monitored on-line, thus providing a fast and accurate determination of any shift in working point conditions. The construction details and the first result of GGM commissioning are described. |
| 5123 | 2008-11-29 | Sensitivity and Environmental Response of the CMS RPC Gas Gain Monitoring System | 2008 | LNF-08-27(P).pdf | L. Benussi, S. Bianco, S. Colafranceschi, F. L. Fabbri, M. Giardoni, B. Ortenzi, A. Paolozzi, L. Passamonti, D. Pierluigi, B. Ponzio, A. Russo, A. Colaleo, F. Loddo, M. Maggi, A. Ranieri, M. Abbrescia, 5, G. Iaselli, 5, B. Marangelli, S. Natali , S. Nuzzo, G.Pugliese, F. Romano, G. Roselli, R. Trentadue , S. Tupputi, R. Guida, G. Polese, A. Sharma, A. Cimmino, D. Lomidze, D. Paolucci, P. Piccolo, P. Baesso, M. Necchi, D. Pagano, S. P. Ratti, P. Vitulo , C. Viviani | Results from the gas gain monitoring (GGM) system for the muon detector using RPC in the CMS experiment at the LHC is presented. The system is designed to provide fast and accurate determination of any shift in the working point of the chambers due to gas mixture changes. |
| 5122 | 2008-11-27 | L’Amplificatore di Carica del Chip SER_09 | 2008 | INFN-TC-08-9.pdf | E. Energico, P. Parascandolo | Il numero dei canali di lettura negli esperimenti di fisica sia di alta energia che di bassa energia che impiegano rivelatori al silicio sta incrementando continuamente, e pertanto c’è un grande sviluppo di dispositivi custom che integrano sullo stesso ASIC un numero grande di canali sia allo scopo di abbattere i costi sia allo scopo di compattare un elevato numero di canali su di una piccola superficie. Per l’esperimento EXPADES, il Servizio Elettronico e Rivelatori della Sezione INFN di Napoli, ha sviluppato il chip SER_09 in tecnologia CMOS da 0.35 micron della AMS (Austrian Microsystem). L’ASIC legge 16 strip e, per ciascun canale nella sezione d’ingresso, è stato incorporato, oltre all’amplificatore di carica, anche una uscita veloce per il timing. L’uscita dell’amplificatore di carica è connessa dapprima ad uno shaper ed è poi seguita da un banco di 16 peak and hold e da un multiplexer analogico a 16 canali. |
| 5121 | 2008-11-24 | Optical Far Field Diffraction Pattern Test of Laser Retroreflectors for Space Applications in Air and Isothermal Conditions at INFN-LNF | 2008 | LNF-08-26(IR).pdf | A. Boni, C. Cantone, S. Dell’Agnello, G. O. Delle Monache, M. Garattini, N. Intaglietta, C. Lops, M. Martini, L. Porcelli | We describe the INFN-LNF standard procedure for the optical Far Field Diffraction Pattern (FFDP) test of cube corner laser retroreflectors (CCRs) for space applications, when these CCRs are in air and in isothermal conditions around (22 ± 2)°C. This procedure was developed in 2007 and 2008, using prototype GLONASS CCRs lent to LNF by IPIE of Moscow and a GPS-2 flight model CCR array lent to LNF by the University of Maryland at College Park (all using Al-coated fused silica retroreflectors of 27 mm diameter). This was done in the context of the INFN experiment ETRUSCO2. The modeling of FFDP measurements is performed with a commercial software, CodeV by O.R.A. Inc., and it has been cross-checked against two independent software programs developed by other two members of the ILRS “Signal Processing Working Group”, D. Arnold and T. Otsubo, finding very good agreement among the three. In summer 2008 this procedure has been validated by performing the FFDP test of the LAGEOS “Sector”, an engineering prototype on loan from NASA-GSFC, equipped with 37 uncoated, fused silica retroreflectors of 38 mm diameter. We report test results for the GLONASS and LAGEOS CCRs. Details of the test procedure and CodeV simulations are given for the particular case of the LAGEOS Sector. |
| 5119 | 2008-11-11 | Nerone Test at 2500 m DEPTH | 2008 | LNF-08-25(IR).pdf | Marco Cordelli, Roberto Habel, Agnese Martini, Luciano Trasatti | NERONE is an instrument designed and built at the LNF to measure with high accuracy and without any bias the attenuation length of light in clean water, capable of operation up to 4000m m depth. Several new technical solutions have been used in the design, including a small and cheap stepper motor assembly. In september 2008, final tests were conducted to a depth of 2500 m, and the results show that the instrument is performing according to design. |
| 5118 | 2008-10-28 | La Power Board per la Stringa Antares a Capo Passero | 2008 | INFN-TC-08-8.pdf | Massimiliano Cresta, Davide Piombo, Fabio Pratolongo | Il presente documento è il rapporto riguardante i test di funzionamento svolti sulla scheda in oggetto, tali test sono orientati alla verifica della corretta operatività e ad una stima di affidabilità della scheda. I risultati riportati sono ottenuti in condizione di sovraccarico, per un periodo continuativo di una settimana. La stabilità dimostrata dalla scheda durante tutto il periodo indica un ottimo margine di affidabilità nelle normali condizioni operative. |
| 5116 | 2008-10-22 | Design of the Radiation Shielding Around the DAFNE BTF Target | 2008 | LNF-08-23(NT).pdf | L. Quintieri, R. Bedogni, B. Buonomo, M. Chiti, M. De Giorgi, A. Esposito, A. Gentile, M. Iannarelli, G. Mazzitelli, R. Sorchetti, G. Sensolini, M. Sperati, P. Valente | This report describes the design of the radiation shield around the energy degrader target at the beginning of the BTF transfer line, successfully installed in May 2008. In particular, the results of Monte Carlo code (Fluka) simulations have been discussed, while the processing of the dose measurements, before and after the installation, is still in progress and will be discussed in a next work. |
| 5117 | 2008-10-22 | Feasibility Study of a Neutron Source at the DA$\\Phi$NE BTF Facility | 2008 | LNF-08-24(NT).pdf | L. Quintieri, B. Buonomo, G. Mazzitelli, P. Valente | There is an increasing interest in our scientific community to have a neutron source at the INFN for detector calibrations and physics investigations in different domains. In this report we describe the preliminary study that we have done to estimate the feasibility of a photo-neutron source at the Da$\\phi$ne Beam Test Facility. The physics of the neutron photo-production is introduced and synthetically discussed in the first 2 sections. In the following ones we show the details of the Montecarlo simulations and the comparison of these results with some important semi-empirical correlations. Finally, we reported some values of the integrated neutron flux, that we expected to have, when a 510 MeV electron beam impinges on a suitable target, made of high Z material. |
| 5115 | 2008-10-20 | Characterization of Avalanche Photo Diodes for the First Super-Module of the ALICE Electromagnetic Calorimeter | 2008 | INFN-TC-08-7.pdf | F. Astuti, A. Badalà, F.Blanco, F.Fichera, N.Giudice, A.Grimaldi, N.Guardone, P. La Rocca, F. Librizzi, G.S. Pappalardo, C. Petta, A. Pulvirenti, F. Riggi, S.Urso, R.Vernet | A status report is given of the ongoing activities in Catania concerning the testing procedures for the Avalanche Photo Diodes (APD) to be used in the first super-module of the ALICE electromagnetic calorimeter. A description of the equipment, testing procedure and protocol, together with results from a first sample of APDs are reported. |
| 5114 | 2008-10-09 | Standards-Based Job Management in Grid Systems | 2008 | INFN-TC-08-6.pdf | Paolo Andreetto, Sergio Andreozzi, Antonia Ghiselli, Moreno Marzolla, Valerio Venturi, Luigi Zangrando | In this paper we review some recent standards which address interoperability for three important Grid services: the BES/JSDL specifications for job submission and management, the SAML notation for authorization and authentication, and the GLUE specification for resource modeling. We describe how standards-enhanced Grid components can be used to form interoperable building blocks for a Grid architecture, and describe how existing Grid software components have actually been re-engineered to support these specifications. From this experience we draw some conclusions on the strengths and weaknesses of the standards, and how they can be improved to address some of the issues we encountered. |
| 5113 | 2008-10-02 | On Crystal-Assisted Processes by Means of 20-800 MeV e-/e+ LNF Beams | 2008 | LNF-08-22(IR).pdf | A .Babaev, O.V. Bogdanov, V.I. Efremov, K.B. Korotchenko, Yu.P. Kunashenko, Yu.L. Pivovarov, and S.B. Dabagov | Based on this idea, in this report we are discussing the features of 20-800 MeV e-/e+ channeling in various crystals. Namely, paying attention to the complex character of radiation origin, the new peculiarities of channeling radiation from relativistic particles have been described in details; the processes of multiple scattering have been studied using a modified binary collision model; the possibility of the particle spin manifestation in radiation parameters has been analyzed; various solutions for coherent production of e-/e+ pairs in crystals have been presented. The results of both computer simulations and estimations are given in many figures and tables. |
| 5112 | 2008-09-29 | Thermal Conductivity Measurements at Cryogenic Temperatures: Hardware and Software Apparatus | 2008 | INFN-TC-08-5.pdf | Antonio Paccalini, Giancesare Rivoltella and Giovanni Volpini | An apparatus to measure the thermal conductivity of bulk samples at cryogenic temperatures is in use at LASA Laboratory since some years. The Magnex Scientific Ltd cryostat and the inner mechanical system realized at LASA, have maintained good performances during the time. On the contrary, the electrical connections have been damaged by the thermal cycles experienced, for this reason they have been replaced. The realization of the thermal sensors, AuFe (0.07% at.w.)-Cromel P thermocouples (TC), has been improved and standardized. A new electronic system, h/w and s/w, has been realized. The temperatures are acquired by a nanovoltmeter, while the measure parameters (pressures, cryogenic levels, etc) are acquired by a precision multiplexer. The acquisition, the storage and the readout of the data are managed in real time by LabView 8.5. The reliability of the measures and the quantity of the data have allowed a deeper study of instrumental phenomena as, for instance, the capacitive effect of the nitrogen level probe on the TC voltage and the relationship between the different thermal zero levels and the physical conditions of the apparatus. |
| 5111 | 2008-09-22 | A Restful Approach to the OGSA Basic Execution Service Specification | 2008 | INFN-TC-08-4.pdf | Sergio Andreozzi, Moreno Marzolla | The~\\ac{BES} specification has recently been proposed by the~\\ac{OGF} as the standard job submission and management interface across different Grid middlewares. This specification defines a~\\ac{WSDL} interface for creating, monitoring and managing computational jobs (called activities), and for querying the capabilities of the~\\ac{BES} service itself. In this paper, we propose an alternate incarnation of the~\\ac{BES} functionalities according to the~\\ac{REST} architectural style. We describe the mapping of the~\\ac{BES} operations in terms of HTTP actions on resources. We compare the~\\ac{REST} formulation of~\\ac{BES} with the standard WS-based one. We show that all~\\ac{BES} operations can be expressed in a very natural way using the standard HTTP protocol and following the~\\ac{REST} approach; moreover, we present useful extensions that are expected to appear in the near future. |
| 5110 | 2008-09-08 | KAIUM at DAFNE ? | 2008 | LNF-08-21(IR).pdf | Vincenzo Lucherini, Tullio Bressani | The possibility of producing and detecting at DAΦNE, in the present configuration, a new Hydrogen isotope formed by a (K+e-) bound system (Kaium) is addressed, considering the unique opportunity to have the machine tuned at its best on the verge of the KLOE roll-in, with a dedicated, and relatively simple experiment of short duration. If Kaium will be detected at DAΦNE, it could in perspective pave the way for a series of highly sophisticated experiments focused in the precision measurement of several quantities, as the K+ mass, that, together with K- mass, are strictly related to CPT invariance. |
| 5109 | 2008-09-03 | Activity Report 2007 | 2008 | AA.VV | ||
| 5108 | 2008-07-23 | New Monochromator and Sonar System - User Manual | 2008 | INFN-TC-08-3.pdf | Veronica Diaz, Piero Ciliberti, Stefano Levorato, Mauro Bari | In this note, we report the features of the RICH Gas Monitoring System. A dedicated system has been designed to handle the delicate radiator gas operations for COMPASS RICH-1. The gas analysis system consists of two components the monochromator system and the sonar system. The monochromator system allows a wavelength-dependent determination of the transparency of the gas in the interesting wavelength range and can indicate the presence of contaminants. The sonar system can determine the composition of a binary gas mixture to a percent level accuracy. |
| 5106 | 2008-07-18 | Elemental Mapping and Micro-Imaging by X-Ray Capillary Optics | 2008 | LNF-08-18(P).pdf | Dariush Hampai, Sultan B. Dabagov, Giorgio Cappuccio, Antonio Longoni, Tommaso Frizzi, Giannantonio Cibin, Valeria Guglielmotti and Marco Sala | Many experiments have recently revealed the advantages of ``confocal'' optical configuration for the fluorescence studies. Indeed, this peculiar layout enables micro X-ray fluorescence mapping simultaneously with X-ray imaging. In this letter the results of experimental investigations for novel polycapillary lenses are presented. The recorded image of characterized extended sample ($\\sim$ 3 mm) with a 6 $\\mu$m spatial resolution, limited by the CCD pixel size, is shown. The use of a second polycapillary lens in the confocal scheme followed by a SDD detector provides an additional option for elemental studies. A prototype of compact XRF spectrometer with a spatial resolution less than 100 $\\mu$m has been designed. |
| 5107 | 2008-07-18 | Merging and Splitting of Clusters in the Electromagnetic Calorimeter of the KLOE Detector | 2008 | LNF-08-19(Thesis).pdf | Jaroslaw Zdebik | The work was carried out in the framework of the KLOE collaboration studying the decays of the phi meson produced in the DAFNE accelerator in the collisions of electron and positron. The main aim of this thesis was investigation of the influence of the merging and splitting of clusters in decays with the high multiplicity of gamma quanta, which are at most biased by these effects. For this aim we implemented the full geometry and realistic material composition of the barrel electromagnetic calorimeter in FLUKA package. The prepared Monte Carlo based simulation program permits to achieve a fast generation of thedetector response separately for each interested reaction. The program was used to study the reconstruction efficiency with the KLOE clustering algorithm as a function of the photocathode quantum efficiency. It was also used to investigate merging and splitting probabilities as a function of the quantum efficiency. The conducted studies indicated that the increase of quantum efficiency does not improve significantly the identification of clusters. The influence of these effects was estimated for eta meson decays into 3 neutral pions and K_short meson into 2 neutral pions. |
| 5104 | 2008-07-01 | Bandwidth Enhancement for Parametric AmplifiersOperated in Chirped Multi-Beam Mode | 2008 | LNF-08-16(P).pdf | F. Terranova, H. Kiriyama, F. Pegoraro | Abstract: In this paper we discuss the bandwidth enhancement that can be achieved in multi-Joule optical parametric chirped pulse amplification (OPCPA) systems exploiting the tunability of parametric amplification. In particular, we consider a pair of single pass amplifiers based on potassium dideuterium phosphate (DKDP), pumped by the second harmonic of Nd:glass and tuned to amplify adjacent regions of the signal spectrum. We demonstrate that a bandwidth enhancement up to 50% is possible in two configurations; in the first case, one of the two amplifiers is operated near its non-collinear broadband limit; to allow for effective recombination and recompression of the outgoing signals this configuration requires filtering and phase manipulation of the spectral tail of the amplified pulses. In the second case, effective recombination can be achieved simply by spectral filtering: in this configuration, the optimization of the parameters of the amplifiers (pulse, crystal orientation and crystal length) does not follow the recipes of non-collinear OPCPA. |
| 5103 | 2008-06-23 | Study of the Response of the NEMO-KM3 Detector Instrumented with Direction-Sensitive Optical Module | 2008 | INFN-TC-08-2.pdf | M. Anghinolfi, M. Bersani, K. Fratini, V. Kulikovsky, M. Osipenko, A. Plotnikov, E. Shirokov, M. Taiuti, S. Zavatarelli | We studied the performances of the underwater neutrino telescope NEMO-KM3 equipped with direction-sensitive optical modules. The main feature of these optical modules is to detect the direction of the incoming Cherenkov light. In this note we show that the effective area of the underwater neutrino telescope NEMO-KM3 could be improved at low neutrino energies (E$_nu < 10$ TeV) by adding in the reconstruction procedure the information on the direction of the detected Cherenkov light. As a consequence we show that it is possibile to reduce the number of towers from 81 to 64 maintaining the same effective area of NEMO-KM3. |
| 5100 | 2008-06-16 | Una Infrastruttura di Autenticazione e Autorizzazione Flessibile e Scalabile per una Comunita' Scientifica Locale | 2008 | INFN-CCR-08-1.pdf | Roberto Alfieri, Roberto Covati | Viene descritto un modello scalabile di Autenticazione e Autorizzazione per l'accesso a tutte le risorse di calcolo e di rete per una ampia comunità locale di utenti, come può essere un Campus Scientifico. L'infrastruttura è stata implementata presso il Campus Universitario di Parma. |
| 5099 | 2008-06-12 | Fondamenti della Fisica-Matematica Classica una Introduzione | 2008 | Camillo Lo Surdo | A book in progress on the foundations of macroscopic mathematical physics, ranging from synthetic euclidean geometry to general relativity. At present, over 800 pages in 48 files. (In italian) | |
| 5098 | 2008-05-09 | Multi-Streamer Studies on Gas Mixtures for the OPERA RPCs | 2008 | LNF-08-14(NT).pdf | Alessandro Paoloni, Ubaldo Denni, Giulietto Felici,Maria Antonietta Frani, Alessandro Mengucci, Giuseppe Papalino, Mario Spinetti | Resistive Plate Chambers with bakelite electrodes are employed in the spectrometers of the OPERA experiment. The RPCs are operated in streamer mode with the gas mixture $Ar/C_2H_2F_4/i-C_4H_{10}/SF_6=75.4/20.0/4.0/0.6$. The studies performed in order to choose the operating gas mixture have been already published. In this note the results of additional tests on the multi-streamer probability are presented. |
| 5097 | 2008-05-08 | Papers presented at PAC 2007 | 2008 | LNF-08-13(P).pdf | Accelerator Division | |
| 5139 | 2008-04-28 | Design and Construction of a Laser-Ranged Test Mass for the Deep Space Gravity Probe Mission and Test of a Hollow Retroreflector for the GPS-3 | 2008 | LNF-08-12(IR).pdf | S. Dell’Agnello, G. O. Delle Monache, A. Boni, C. Cantone, M. Garattini, N. Intaglietta, C. Lops, M. Martini | The “Satellite/lunar laser ranging Characterization Facility” (SCF) of INFN-LNF in Frascati, Italy, is devoted to the characterization of the detailed thermal properties and the optical performance of laser- ranged payloads (the “SCF-test”) for GNSS, Space Geodesy and Fundamental Physics applications [1][2]. The Optical Lab is a second LNF facility dedicated to the far field diffraction pattern (FFDP) industrial acceptance test of laser cube corner retroreflectors (CCR) for space applications. We tested about 200 flight CCRs to be deployed in space by imminent launches at the two LNF facilities. These launches are for the current American Global Navigation Satellite System Constellation, the GPS-2 by NASA and for the European VEGA Program, by ESA/ASI. Some of the tested CCRs are for undisclosed missions by other space agencies. Deep Space Gravity Probe (DSGP) is a mission led by NASA-JPL (S. Turyshev is the PI), proposed to NASA and to the ESA “Cosmic Vision” program to study the anomalous deceleration of the Pioneer 10 and 11 probes and other important interplanetary science topics. In the context of a three-year study on “Cosmology and Fundamental Physics” (COFIS) funded by ASI and led at national level by P. de Bernardis we designed a prototype laser-ranged test mass for the DSGP satellite formation. This mass is being built at LNF and will be SCF-Tested at the SCF. We are also collaborating with NASA-GSFC (J. McGarry et al) on the test of innovative CCRs for the GPS-3. The goal of this R&D is to convince the US Air Force and Department of Defense of the full functionality of the hollow retroreflector design. This is a prerequisite to propose the deployment of retroreflectors on the GPS-3, which, unlike GALILEO, is a military constellation. |
| 5094 | 2008-03-27 | A Review of Experimental studies about Hydrogen over-loading within Palladium wires (H/Pd ≥ 1) | 2008 | LNF-08-10(P).pdf | A. Spallone, A. Marmigi, F. Celani, P. Marini, V. di Stefano | Many hundred of systematic tests have been performed, at Frascati National Laboratories, in order to achieve very high concentration of Hydrogen (overloading) into Palladium wires. The electrodes (cathode in central position: Pd wires 50 or 100 μm tick; anode: Pt wires 0.5mm tick) were placed in a coaxial geometry into a small cylinder electrolytic cell. A specific study has been performed in order to optimise the electrolytic solution based on H2O (400 cm3) + HCl (50 ÷ 200 μM) and small amounts (tenth of μM) of salts (carbonate or sulphates) of the following alkaline and alkaline-earth metals: Li, Na, K, Ca or Sr. Very small amounts (hundred of nM) of HgCl2 has been also added to the electrolyte. The addition of Hg ions has been crucial to achieve very high and stable overloading. To increase the reproducibility of the overloading a peculiar loading protocol, based on high/low (or OFF/ON) cathodic current cycles, has been tested successfully. The H/Pd loading ratios have been estimated by the on-line measurement of the normalised wire resistance (R/Ro). Loading results are quite satisfactory: H/Pd ≥ 0.97 (R/Ro≤ 1.30; input electrolytic current/voltage: 7V, 5mA) are typically reached and sometimes H/Pd ≥ 1 (R/Ro ≅ 1.15; input current/voltage: 11V, 2.5mA) has also been achieved. The reproducibility of the results is quite satisfactory. |
| 5093 | 2008-03-25 | Anomalous Heat Generation by Surface Oxidized Pd Wires in a Hydrogen Atmosphere | 2008 | LNF-08-9(P).pdf | A. Marmigi, A.Spallone, F.Celani, P. Marini, V.di Stefano | Thin Pd wires (diameter 50 micrometers) surface oxidized through Joule heating have been loaded in a Hydrogen atmosphere at pressures in the range 1 - 10 bar. The atomic ratio H/Pd reached in the experimental conditions has been evaluated through its relationship with the electrical resistivity of Hydrogen loaded Pd. It was found that the loading rate of the surface oxidized Pd wires is exceptionally higher than with the untreated ones (full loading in a few minutes as compared with several hours). It was also observed that surface treated wires with H/Pd ≥ 0.75, don't lose Hydrogen even when Joule heated at temperatures up to about 150 °C in a Hydrogen atmosphere. When the wire temperature exceeds 150 °C (applied power about 12.4 W) there is an anomalous heat generation (about 3.5 W). During an experimental test, comprising feeding the wire with stepwise increasing power values each for 500-600 seconds, followed by a period of zero power, it was observed that when the power was cut off after the period of powering with 14 W, the wire spontaneously heated for about 70 seconds releasing an estimated heat of 1650 ± 160 J, corresponding to 3940 ± 400 Kcal per mole of Pd. Peak power was ~ 16 W. The wire resistance spontaneously reaches a value R/Ro = 2.40 and then slowly dropped to the original value of 1.80 at room temperature. In a second experimental test with the same wire similar phenomena have been observed although of lower intensity but lasting over 3000 seconds. After 16 W powering for 500 seconds, the power was cut off. Again the wire heated spontaneously releasing an anomalous heat of 3600 ± 360 J, corresponding to some 13200 ± 130 Kcal per mole of Pd. The peak power was ~ 3 W. The wire resistance increased spontaneously up to R/Ro = 2.01 and then slowly decreased down to 1.90. |
| 5091 | 2008-03-12 | Nuclear Photodisintegration in the Solar Field: Numerical Simulations of the Gerasimova-Zatsepin Effect | 2008 | INFN-AE-08-1.pdf | P. La Rocca and F. Riggi | Numerical simulations of the photodisintegration process of cosmic nuclei in the photon solar field and of the transport of their charged products in the interplanetary magnetic field have been carried out. The fragmentation probability and the separation between the two fragments have been evaluated as a function of the energy and mass of the primary nucleus, by the use of a realistic model of the interplanetary magnetic field |
| 5092 | 2008-03-12 | A Nexafs Study of Nitric Oxide Layers Adsorbed from a Nitrite Solution Onto a Pt(111) Surface | 2008 | LNF-08-8(P).pdf | M. Pedio, E. Casero, S. Nannarone, A. Giglia, N. Mahne, K. Hayakawa, M. Benfatto, K. Hatada, R. Felici, J.I. Cerdá, C. Alonso, J. A. Martin-Gago | NO molecules adsorbed on a Pt(111) surface from dipping in an acidic nitrite solution are studied by near edge X-ray absorption fine structure spectroscopy (NEXAFS), X-ray photoelectron spectroscopy (XPS), low energy electron diffraction (LEED) and scanning tunnelling microscopy (STM) techniques. LEED patterns and STM images show that no long range ordered structures are formed after NO adsorption on a Pt(111) surface. Although the total NO coverage is very low, spectroscopic features in N K-edge and O K-edge absorption spectra have been singled out and related to the different species induced by this preparation method. From these measurements it is concluded that the NO molecule is adsorbed trough the N atom in an upright conformation. The maximum saturation coverage is about 0.3 monolayers, and although nitric oxide is the major component, nitrite and nitrogen species are slightly co-adsorbed on the surface. The results obtained from this study are compared with those previously reported in the literature for NO adsorbed on Pt(111) under UHV conditions. |
| 5089 | 2008-02-21 | Fisica Fondamentale con la Missione Lunare MAGIA | 2008 | LNF-08-6(IR).pdf | S. Dell’Agnello, R. Vittori, G. O. Delle Monache, D. G. Currie, G. Bellettini, R. March, R. Tauraso, C. Prosperi, C. Cantone, M. Garattini, A. Boni, M. Martini, C. Lops, N. Intaglietta, M. Maiello | Il Consigio di Amministrazione dell'ASI, nella sua seduta del 7/2/2008, ha individuato le cinque proposte, nell’ambito del Bando Piccole Missioni, di cui verrà finanziato lo studio di Fase A, ovvero lo studio di fattibilità preliminare alla scelta delle due missioni che verranno lanciate entro il 2014. Una di queste cinque missioni è MAGIA (Missione Altimetrica Gravimetrica geochimica Italiana lunAre), di cui il Principal Investigator è la Prof. A. Coradini (INAF-IFSI) e il Prime Industriale è Rheinmetall Italia S.p.A. La missione si propone di rispondere ad alcune delle questioni di maggiore importanza per lo studio della Luna quali la struttura interna, elemento necessario per comprendere l’origine e la formazione, la ricerca di evidenze di processi di differenziazione che devono aver caratterizzato la parte iniziale della formazione e la correlazione con la successiva fase dominata dalla craterizzazione della superficie. Al momento, i dati geochimici e mineralogici da telerilevamento lunare, utili per raccordare le analisi dei campioni di rocce prelevate in-situ ad aree del satellite più vaste, sono disponibili solo per la “near side”. Inoltre anche le missioni più recenti (Clementine, SMART-1, Lunar Prospector) non avevano a bordo strumenti in grado di effettuare un’analisi mineralogica accurata. MAGIA si propone inoltre una precisa caratterizzazione del campo gravitazionale lunare, ed ad un’accurata misura del suo stato rotazionale. Questi temi sono tutti strettamente legati tra loro concorrendo, infatti, a migliorare la comprensione dell’origine ed evoluzione della Luna. Inoltre, MAGIA mostrerà come si possa utilizzare una piattaforma in orbita circumlunare al fine di ottenere misure di fisica fondamentale, quali un miglioramento delle misura del redshift gravitazionale, una “precursor mission” per la proposta di Lunar Laser Ranging di seconda generazione, MoonLIGHT, ed un potenziale ulteriore miglioramento dei test delle Relatività Generale grazie ad una misura indipendente della posizione del selenocentro rispetto a Terra. Questo Report descrive il pacchetto di Fisica Fondamentale della proposta MAGIA. |
| 5088 | 2008-02-18 | Minijets, Soft Gluon Resummation and Photon Cross-Sections | 2008 | LNF-08-5(P).pdf | R.M. Godbole, A. Grau, G. Pancheri, Y.N. Srivastava | We compare the high energy behaviour of hadronic photon-photon cross-sections in different models. We find that the photon-photon cross-section appears to rise faster than the purely hadronic ones($pp$ and $p\\bar{p}$). |
| 5087 | 2008-02-06 | Properties of Nanocomposites Based on Resin and Carbon Nanotubes | 2008 | LNF-08-4(P).pdf | S Bellucci, F Micciulla, N Pugno | A systematic study of the electrical properties of polymeric composite materials based on carbon nanotubes (CNTs), carried out at INFN-Laboratori Nazionali di Frascati is reviewed. The purpose was to make a light, thin and mechanically strong composite material to cover electric circuits against external electromagnetic interference. The epoxy resin that was used as a polymeric matrix is a commercial Shell product Epon 828. Two types of curing agent were used along with the resin, namely the A1 curing agent and PAP8 agent. The composite is obtained using the A1 curing agent, selected for the stability of the corresponding composite over a wide range of pressure values, in comparison with a different curing agent (namely PAP8). Benchmarking the resistivity properties of composites based on CNTs with those containing micron-sized graphite particles as a constituent, shows the advantages of using carbon nanotubes. The change in the resistivity values for carbon nanotubes based composites turns out to be significant, even for small changes in the added carbon nanotubes percentage. These results might be important for determining the most suitable “recipe” for the realization of composite materials for high-fidelity circuits in aerospace applications, or even in devices exposed to disturbances predominantly electromagnetic in their nature. It is planned also to present in future reports a study of carbon nanotubes based composites with PAP8. Also, we plan to show the composite behavior in controlled humidity environments and for different temperatures. Finally preliminary results on the mechanical characterization of the nanocomposites will be presented elsewhere |
| 5084 | 2008-02-04 | A New Approach to LAGEOS Spin Orientation and its Role IN General Relativity Measurements | 2008 | LNF-08-3(P).pdf | Douglas Currie, Simone Dell’Agnello, Giovanni Delle Monache, Marco Garattini, Roberto Tauraso | The two LAGEOS Satellites have addressed a variety of issues in Geophysics (GP) and General Relativity (GR). The extreme accuracy of laser ranging (currently approaching millimeter accuracy) now means that very small error sources act upon LAGEOS and have become important, affecting the study of GP (e.g., the tides) and GR (e.g., Lense-Thirring Effect). Initial measurements and analysis of the spin orientation were first performed at the in the early 1990s at the University of Maryland. However, the spin rate of LAGEOS has slowed to the point that this method is no longer effective. A new observing approach (the “Pocket Modulation Effect”) to determine the spin axis has been proposed by the first author. Data that addresses this method has been collected at various sites and is being analyzed at INFN-LNF. We will report on the physics involved in the PME and describe the laboratory data and simulations performed to validate the proposed approach, the LAGEOS data obtained at sites, the new analysis procedures and then address the impact of this new information. |
| 5083 | 2008-01-30 | Large Rapidity Gaps Survival Probabilities at LHC | 2008 | LNF-08-2(P).pdf | Rohini M. Godbole, Agnes Grau,Giulia Pancheri, Yogendra N. Srivastava | We calculate the probability of large rapidity gaps in high energy hadronic collisions using a model based on QCD mini-jets and soft gluon emission down into the infrared region. Comparing with other models we find a remarkable agreement among most predictions. |
| 5082 | 2008-01-11 | The INFN-LNF Space Climatic Facility | 2008 | LNF-08-1(P).pdf | D. Arnold, G. Bellettini, A. Boni, C. Cantone, I. Ciufolini, D. G. Currie, S. Dell’Agnello, G. O. Delle Monache, M. A. Franceschi, M. Garattini, N. Intaglietta, A. Lucantoni, M. Martini, T. Napolitano, A. Paolozzi, R. Tauraso, and R. Vittori | The Space Climatic Facility (SCF) is an experimental apparatus built in 2006 at the Frascati National Laboratory of INFN to study the thermal thrusts acting on the LAGEOS I and II satellites and to perform integrated thermal and optical characterization of retro-reflector (CCR) arrays for laser ranging. The latter include the new LARES satellite, whose main scientific goal is to improve the measurement accuracy of the frame dragging of the Earth (Lense-Thirring effect) predicted by General Relativity and reach a relative accuracy of the order of 1%. The SCF is also devoted to make the same tests on CCR arrays deployed on GNSS constellations (especially on GALILEO) within an approved INFN experiment, ETRUSCO. The SCF is a cylindrical cryostat where a realistic space environment is established in terms of pressure (10-6-10-7 mbar), temperature (down to 77 K) and e.m. radiation (Sun simulator and infrared Earth simulator). Thermal simulations are well advanced and laser-optical simulations are making good progress. |
| 5081 | 2008-01-09 | Traction Tests for The Qualification of the TTF/ILC Composite Support Posts | 2008 | INFN-TC-08-1.pdf | S. Barbanotti, M. Bonezzi, M. Todero, N. Panzeri | Between January and June 2007 a new set of 6 low thermal conduction structural supports for the TTF cold mass has been produced at INFN Milano LASA. The support posts will be used for the cryomodule that will be delivered by INFN for the ILCTA at FNAL. This document resumes the characteristics of the pieces produced and describes the tests and measurements performed to characterize and qualify these devices. |
| 5080 | 2007-12-05 | Qualificazione di Contenitori inn Titanio Effettuati In Camera Iperbarica | 2007 | INFN-TC-07-13.pdf | A. Ferrari, A. Grimaldi, A.Rottura | In questo rapporto è descritto il test effettuato con camera iperbarica su 3 contenitori in titanio per qualificarne la loro tenuta ad una pressione esterna di lavoro di 350 bar equivalente a 3500 m di colonna d’acqua. |
| 5079 | 2007-12-03 | Alcune Riflessioni Generali sulle Teorie Fisico-Matematiche | 2007 | LNF-07-28(IR).pdf | Camillo Lo Surdo | Avvertenza: Con le piccole modifiche del caso, i due articoli (I,II) che seguono sono l’“Introduzione” e l’ultima “Appendice Generale” con le quali si apre, e rispettivamente si chiuderà, un libro sui Fondamenti della Fisica Matematica Macroscopica che il loro autore sta attualmente scrivendo. Tra di esse, al momento sono state redatte circa settecento pagine. Ovviamente (II) va letto dopo (I). Notice: With slight modifications, the two following articles (I,II) are the “Introduction” and the last “General Appendix” which opens, and respectively will close, a book on the “Foundations of Macroscopic Mathematical Physics” presently under progress by the same author. In between, some seven hundred pages have been written to date. Of course, (II) should be read after (I). |
| 5077 | 2007-11-30 | Confronto di Prestazioni di Applicazioni Hep con Benchmark Sintetici | 2007 | INFN-CCR-07-10.pdf | Michele Michelotto | I siti candidati ad ospitare i centri di calcolo Tier2 hanno comprato a fine 2006 diversi nodi di calcolo. Tipicamente macchine 1U con doppio processore dual core e 4 GB di memoria. Il costo medio, Iva Compresa, si aggira attorno ai 0.5 Euro/SI2000. |
| 5078 | 2007-11-30 | Costi e Prestazioni dei Worker Node per il Calcolo LHC | 2007 | INFN-CCR-07-11.pdf | Michele Michelotto | Questo documento descrive il panorama dei processori disponibili sul mercato per nodi di calcolo (Worker Node) nei prossimi sei – dodici mesi. La valutazione delle prestazioni dei processori in questo momento di transizione tra SPEC int 2000 e SPEC int 2006 è molto delicato perché non è chiaro quale sarà la scelta futura come benchmark di riferimento. Spero in un rapido passaggio a SPEC int 2006 rate misurato con compilatore gcc. Cercherò anche di prevedere i prezzi per acquisti tipici da Tier2 (10-30 box). |
| 5076 | 2007-11-30 | Performance of Dual Processor Server on Hep Code | 2007 | INFN-CCR-07-9.pdf | Michele Michelotto | Evaluation of cpu architecture for dual processor Worker Node. The performances of dual processor WN are evaluated using some programs commonly used in HEP environment. Finally the performances are compared to the clock of the cpu to assess and to the Spec 2000 CpuInt (commonly called specint) taken from the spec.org site. |
| 5073 | 2007-11-26 | Neutrino Hierarchy from CP-Blind Observables with High Density Magnetized Detectors | 2007 | LNF-07-26(P).pdf | A. Donini, E. Fernandez-Martinez, P. Migliozzi, S. Rigolin, L. Scotto Lavina, M. Selvi, T. Tabarelli de Fatis, F. Terranova | High density magnetized detectors are well suited to exploit the outstanding purity and intensities of novel neutrino sources like Neutrino Factories and Beta Beams. They can also provide independent measurements of leptonic mixing parameters through the observation of atmospheric muon-neutrinos. In this paper, we discuss the combination of these observables from a multi-kton iron detector and a high energy Beta Beam; in particular, we demonstrate that even with moderate detector granularities the neutrino mass hierarchy can be determined for $\\theta_{13}$ values greater than 4$^\\circ$. |
| 5074 | 2007-11-26 | Sterile Neutrinos at the CNGS | 2007 | LNF-07-27(P).pdf | A. Donini, M. Maltoni, D. Meloni, P. Migliozzi, F. Terranova | We study the potential of the CNGS beam in constraining the parameter space of a model with one sterile neutrino separated from three active ones by an O(eV2) mass-squared difference, $\\Delta m2_{SBL}$. We perform our analysis using the OPERA detector as a reference (our analysis can be upgraded including a detailed simulation of the ICARUS detector). We point out that the channel with the largest potential to constrain the sterile neutrino parameter space at the CNGS beam is $\\nu_\\mu \\to \\nu_\\tau$. The reason for that is twofold: first, the active-sterile mixing angle that governs this oscillation is the less constrained by present experiments; second, this is the signal for which both OPERA and ICARUS have been designed, and thus benefits from an extremely low background. In our analysis we also took into account $\\nu_\\mu \\to \\nu_e$ oscillations. We find that the CNGS potential to look for sterile neutrinos is limited with nominal intensity of the beam, but it is significantly enhanced with a factor 2 to 10 increase in the neutrino flux. Data from both channels allow us, in this case, to constrain further the four-neutrino model parameter space. Our results hold for any value of $\\Delta m2_{SBL} \\gtrsim 0.1~\\eV2$, i.e. when oscillations driven by this mass-squared difference are averaged. We have also checked that the bound on $\\theta_{13}$ that can be put at the CNGS is not affected by the possible existence of sterile neutrinos. |
| 5075 | 2007-11-26 | XEN e i Benefici della Virtualizzazione HVM | 2007 | INFN-CCR-07-8.pdf | Riccardo Veraldi | Xen è un Virtual Machine Monitor che consente l’implementazione di macchine virtuali. Grazie alla tecnologia presente nelle CPU di ultima generazione è possibile girare un sistema operativo nativo come macchina virtuale su Xen. I benefici sono molteplici e vanno dalla possibilità di girare sistemi operativi misti a 32 e 64 bit su un unico hardware, all’implementazione dell’alta affidabilità, al test di nuovi sistemi operativi. Il seguente documento descrive Xen nell’ottica di hypervisor di macchine virtuali utilizzando come base (dom0) la distribuzione Scientific Linux 5.0 x86_64 |
| 5072 | 2007-11-16 | EXPLORER and NAUTILUS Correlation for Damped Sinusoid Signals | 2007 | LNF-07-25(IR).pdf | G. Modestino and G.Pizzella | The correlation coefficient between the data of the cryogenic resonant detectors EXPLORER and NAUTILUS, for the case of damped sinusoid gravitational wave signals, has been studied. It is found that it is possible to obtain a 5 $\\sigma$ result for gravitational waves with amplitude of the order of $h\\sim 10^{-20}-10^{-19}$. |
| 5071 | 2007-11-08 | AMADEUS Phase-1: Physics, Setup and Roll-in Proposal | 2007 | LNF-07-24(IR).pdf | P. Buehler, M. Cargnelli, A. Hirtl, T. Ishiwatari, P. Kienle, J. Marton, E. Widmann, J. Zmeskal, M. Faber, A. Ivanov, A. Hussein, F. Nichitiu, D. Gill, G. Beer, A. Olin, B. Borasoy, R. Nissler, U. Raha, A. Rusetsky, H. Orth, A. Gillitzer, V.E. Lyubovitskij, N. Hermann, L. Fabietti, B. Ketzer, R. Kreken, S. Neubert, S. Paul, K. Suzuki, W. Weise, Q. Weitzel, S. Choudhoury, J. Esmaieli, S.Z. Kalantari, M. Raiesi, S. Bartalucci, M. Bazzi, M. Catitti, C. Curceanu, A. d'Uffizi, C. Guaraldo, M. Iiescu, P. Levi Sandri, M.P. Lombardo, D. Pietreanu, A. Romero Vidal, S. Scordo, D. Sirghi, F. Sirghi, L. Sperandio, O. Vazquez Doce, F. Ghio, B. Girolami, L. Bombelli, C. Fiorini, T. Frizzi, A. Longoni, L. Ludhova, G. Violini, P. Gensini, R. Casalbuoni, M. Di Toro, A. Dote', Y. Akaishi, T. Yamazaki, S. Wycech, P. Hawranek, S. Kistryn, A. Magiera, J. Smyrski, A. Wronska, A.M. Bragadireanu, T. Ponta, T. Preda, A. Tudorache, V. Tudorache, M. Calin, A. Jipa, I. Lazanu, A.E. Astratyan, V.V. Barmin, V. Baru, L. Bogdanova, V.S. Borisov, G.V. Davidenko, A. Dolgolenko, V. Grishina, L. Kondratyuk, A. Krotenkova, M.A. Kubantsev, A. Kudryavtsev, I.F. Larin, V.A. Matveev, V.A. Shebanov, N.N. Shishov, L.I. Sokolov, V. Tarasov, G.K. Tumanov, E. Turdakina, O.V. Bulenkov, B.A. Chernysev, Yu.B. Gurov, S.V. Lapushkin, A.K. Ponosov, D.A. Romanov, F.M. Sergeev, R.R. Shafigullin, P. Aslanyan, A. Galoyan, V. Uzhinsky, V.V. Burov, V.S. Richvitsky, S.H. Connell, R. Lemmer, J.-P. Egger, L. Schaller, S. Popescu, L. Tauscher, B. Lauss | A proposal for the phase-1 of the AMADEUS experiment at DAFNE is presented. It contains the physics goals, the setup design, the Monte Carlo simulations and the luminosity requests; a roll-in proposal is also put forward. |
| 5070 | 2007-11-05 | On Possibility of Spin Manifestation in Channeling Radiation | 2007 | LNF-07-23(IR).pdf | A. Babaev, S.B. Dabagov | The Dirac equation for both electron and positron moving under planar channeling condition was considered. The influence of projectile’s spin on the bound energy levels of transverse motion was estimated within analytical approach. The estimates show that for ultra relativistic projectiles and for variety of crystals the presence of a spin results in a small splitting of a bound energy level. This effect, in principle, can be revealed by the use of precise techniques. |
| 5068 | 2007-10-19 | Measurement of the Frequency Responsivity of a Fiber Optic Air Backed Mandrel Hydrophone up to 10 Khz in Air | 2007 | INFN-TC-07-12.pdf | M.Anghinolfi, A.Bersani, A.Calvi, A.Cotrufo, M.Ivaldi, O.Ershova, F.Parodi, D.Piombo, A.Plotnikov and L.Repetto | We describe the measurements which we have conducted to determine the responsivity of our prototype fiber optic hydrophone in air in the frequency range up to 10 kHz. Hydrophone calibration was performed with the help of a microphone with a known frequency response characteristic. Hydrophone responsivity was found to be flat within ±6 dB in the given frequency range. We also studied the minimum pressure amplitude detectable by our hydrophone in air. |
| 5067 | 2007-10-09 | Proposal for a Set up of an Rf Power Hall For X-Band Accelerating Structures Testing at LNF | 2007 | LNF-07-21(IR).pdf | D. Alesini, R. Boni, M. Calvetti, V. Chimenti, A. Clozza, A. Gallo, L.Pellegrino, R. Ricci, C. Sanelli, B. Spataro, F. Tazzioli, C. Vaccarezza | In this paper we present a study to provide the LNF, under the Accelerator Division responsibility, of an RF power hall to accommodate a 50 MW X-Band klystron together with its High Voltage modulator to be used as a test stand for characterizing high frequency RF accelerating structures. The proposal is to locate the Test Hall in a portion of the LNF building #7 where a shielded bunker already exists and has been used to test and pre-conditioning the DAFNE RF cavities before their installation in the accelerator halls |
| 5066 | 2007-09-25 | A Biperiodic X-Band Cavity for SPARC | 2007 | LNF-07-20(P).pdf | D.~Alesini, B.~Spataro, L.~Ficcadenti, A.~Mostacci, L.~Palumbo, A.~Bacci$^c$, R.~Parodi | n order to produce a high brightness electron beam for the Frascati Linac coherent light source (SPARC) the use of an accelerating section with frequency equal to the fourth harmonic of the main S-Band Linac frequency is needed. This paper discusses the design and the realization of a compact X-band linear accelerating section for obtaining 5MV average accelerating gradient, working at a frequency of 11.424~GHz and operating on the $\\pi/2$ standing wave mode. Numerical predictions compared with measurements made on a copper prototype at room temperature are reported. |
| 5065 | 2007-09-24 | A Proposal for the Roll-in of the KLOE-2 Detector | 2007 | LNF-07-19(IR).pdf | F. Bossi, F. Anulli, D. Babusci, R. Baldini, G. Bencivenni, M. Beretta, S. Bertolucci, C. Bloise, P. Campana, G. Capon, P. Ciambrone, E. Dan'e, E. De Lucia, P. De Simone, D. Domenici, G. Felici, E. Iarocci, J. Lee Franzini, M. Martini, F. Mescia, S. Miscetti, S. M'ueller, F. Murtas, L. Pancheri, M. Palutan, V. Patera, M. Poli Lener, P. Santangelo, B. Sciascia, A. Sciubba, G. Venanzoni, R. Versaci, R. Beck, B. Borasoy, A. Nikolaev, R. Nissler, M. Unverzagt, G. De Robertis, O. Erriquez, F. Loddo, A. Ranieri, E. Czerwinski, P. Moskal, J. Zdebik, V. Babkin, V. Golovatyuk, I. Tyapkin, P. Beltrame, A. Denig, W. Kluge, D. Leone, S. A. Bulychjov, V. V. Kulikov, M. A. Martemianov, M. A. Matsyuk, C. Bini, V. Bocci, G. De Zorzi, A. Di Domenico, P. Franzini, P. Gauzzi, E. Pasqualucci, M. Testa, A. D'Angelo, R. Di Salvo, A. Fantini, R. Messi, D. Moricciani, P. Branchini, F. Ceradini, B. Di Micco, E. Graziani, F. Nguyen, A. Passeri, L. Tortora, A. Go, L. Kurdadze, D. Mchedlishvili, M. Tabidze$^dag$, H. Cal'en, K. Fransson, B. H'oistad, T. Johansson, A. Kupsc, P. Marciniewski, J. Zloman | This is a proposal for a multi-step installation of the KLOE-2 detector on the \\DAF\\ beam line, starting from the fall of 2008. |
| 5063 | 2007-09-19 | High Temperature Deuterium Absorption in Palladium Nano-Particles | 2007 | LNF-07-18(P).pdf | V. Andreassi, G. Cappuccio, F. Celani1, P. Di Biagio, V. Di Stefano, F. Falcioni, F. Fontana, L. Gamberale, D. Garbelli, D. Hampai, M. Marchesini, P. Marini, A. Marmigi, A. Mancini, U. Mastromatteo, M. Nakamura, E. Purchi, P. Quercia, E. Righi, P.G. Sona, A. Spallone, F. Todarello, G. Trenta | On the basis of the Yoshiaki Arata’s “sauna bath reactor”, a simplified reactor (one chamber, without the second internal hollow Pd chamber were the material to be studied is filled) has been built, capable of operating at high pressures (100 bar) and at temperatures from -196 up to 350°C. With this instrument various Pd containing materials were tested: Pd black, HSA Pd black, Pd on activated carbon, Pd (from nitrate) on colloidal silica, Pd in porous γAl2O3, Pd-Sr nitrate in porous γAl2O3. The D/Pd ratios have been measured in all the materials. Evidence of excess heat was found with some of the tested materials. The one chamber reactor was improved later by adding a second, reference chamber, which is similar to the working chamber, as a sort of differential calorimeter. Such a device is capable to highlight (and measure), in real time, the occurrence of excess heat in Pd powders or Pd containing materials put in the crucible of the measurement chamber of the instrument. With respect to the reference chamber, whose crucible is filled with inert material, the excess heat, due to the Deuterium absorption, makes the temperature of the working chamber to rise. Both the chambers are supplied with the same power input. A sample of Pd black_HSA (4.8 g) showed (at 290°C) a clear excess temperature of 13.5°C equivalent to an excess heat of up to 520milliwatts. The direct relationship between the excess heat and the D2 content in the Pd powder has been demonstrated: in fact, when a partial degassing of the Pd powder occurred, a subsequent decrease of the excess heat also occurred.The anomalous excess heat, due to the close interaction, at nanometric scale, of Deuterium with Pd, seems to be clearly detected by proper experimental set-up and operating conditions. The amount of energy detected is larger of any chemical reaction known. |
| 5060 | 2007-09-17 | Optical Characterization of Lares Cube Corner Reflectors | 2007 | LNF-07-17(Thesis).pdf | Alessandro Lucantoni | |
| 5059 | 2007-07-24 | A Multi Purpose Reprogrammable NIM Module | 2007 | INFN-TC-07-11.pdf | Andrea. Papi, Pasquale. Lubrano, Ermanno Imbergamo | We inform about the realization of a NIM interface module thought to replace large variety of old fashioned electronics usually present in experimental setups for Nuclear Physics. In the following note, we discuss the design guidelines along with the most relevant technical choices that we performed |
| 5058 | 2007-07-18 | The Update of the Rich Control System | 2007 | INFN-TC-07-10.pdf | Veronica Diaz | In this note, I report the features of the RICH Control System software package. This performs the programming and control of the COMPASS RICH-1 read-out. The porting of the all the software modules of the system to Windows XP Operating System and the Update of the hardware of the richctrl computer will allow to work with the updated XP Operating System that will be supported by CERN in the next coming years. |
| 5057 | 2007-07-16 | Distributions of the Signals from Gravitational Antennas Versus Nautilus Local Sidereal Hours (NALSH) and Correlations Between the Signals and X-Ray Signatures in Close Binary Systems and SGR | 2007 | LNF-07-16(P).pdf | Gian Paolo Murtas | I have considered coincidences between signals detected by resonant detectors of Gravitational Wave NAUTILUS and EXPLORER located in LNF Frascati and CERN Geneva SW. Time coincidences acceptance is $\\pm$ 10 s. In this way the coincidences are accidentals and have a physical meaning if they are due to projectiles hitting independently the two distant detectors. In order to understand the phenomena I have performed correlations with X-ray detected by satellites and found that 4U1820-30, XTEJ1550-564, SGR1627-41, SGR1900+14, SGR1806-20, during the 1997, 1998 ware the responsible Sources. Studying the energy distribution of the projectiles versus NAUTILUS Local Sidereal hours I found that these projectiles have a quadrupolar structure i.e. transport polarization and the simplest interpretation is t hat they are GRAVITONS. |
| 5056 | 2007-07-09 | Study of the Optical Properties of the Mirrors of the Directional Optical Module for the Nemo Neutrino Underwater Telescope | 2007 | INFN-TC-07-9.pdf | M. Brunoldi, R. Chittofrati, G. Ottonello, A. Rottura,E. Shirokov, M. Taiuti | The reflectivity properties of different materials have been studied in order to select the best material to be used in the NEMO Directional Optical Module. The Cherenkov light produced in water by muons has been simulated with a monochromatic coherent laser of 476 nm of wavelength; to reduce refractive effects, a semi-cylinder shaped piece of Plexiglas has been used to simulate the light guide. Different reflecting materials have been matched to the Plexiglas and reflected light power has been measured by a photodiode as a function of incident light angle. |
| 5055 | 2007-07-05 | Dynamic Aperture Optimization for the DAΦNE Upgrade | 2007 | LNF-07-15(IR).pdf | Eugene Levichev, Pavel Piminov, Pantaleo Raimondi, Mikhail Zobov | Recently proposed novel idea of “crabbed waist” beam-beam collisions will be tested at DAΦNE during the collider run for the Siddharta experiment. In order to achieve the goal luminosity, large dynamic aperture is a matter of primary importance. A new method of a dynamic aperture optimization based on step-by-step chromaticity compensation with choosing the “best” sextupole pair at each step was applied to the DAΦNE upgrade lattice. Several tune points were considered taking into account both high luminosity and large dynamic aperture. Algorithm and results of optimization will be presented. |
| 5054 | 2007-06-26 | Sistema di Acquisizione per Impiego in Laboratorio di Fisica Nucleare, Basato su Bridge USB CAEN® V1718 | 2007 | INFN-TC-07-8.pdf | M. Ivaldi, M. Battaglieri, A.Bersani, M. Brunoldi, R. De Vita, G. Ottonello, D. Piombo, A. Rottura | Nella presente pubblicazione è descritto il funzionamento hardware e software di un sistema di acquisizione, basato sull’utilizzo di un Bridge CAEN® V1718, assemblato e testato nella seconda metà del 2006 presso il Gruppo III INFN Sezione di Genova. |
| 5053 | 2007-06-18 | Searching for Triple Coincidences among the Resonant Gravitational Wave Detectors AURIGA, EXPLORER and NAUTILUS in the year 2005: A Study on the Coincidence Window | 2007 | LNF-07-14(IR).pdf | G. Giordano and G. Pizzella | We report here the results of a study on the search for triple coincidences among the resonant gravitational wave detectors AURIGA, EXPLORER and NAUTILUS in the year 2005. The main problem we have studied has been how to choose the coincidence window for the best search of triple coincidences. If the window is too small we may loose real coincidences, if the window is too large, we do get all real coincidences, but they are imbedded in a large background of accidental coincidences. We find that the best choice is a window not greater than two or three standard deviations of the time uncertainty of each event. |
| 5051 | 2007-06-14 | Note on Type 3 TTF Cryomodule | 2007 | INFN-TC-07-6.pdf | S. Barbanotti | This document describes the design and production of a type 3 TTF cryomodule designed by INFN in the framework of the TESLA1-2) Collaboration. The aim of this report is to document the design and the cryomodule production, starting from the material choices up to the production tests. As reference for the cryomodule production and test have been considered the two cryomodule type 3+ fabricated at “E. Zanon” company during 2007. |
| 5052 | 2007-06-14 | La Scheda E-Tibbo | 2007 | INFN-TC-07-7.pdf | V. Masone, P. Parascandolo | Questa nota descrive una possibile applicazione del modulo EM202 della Tibbo Technology come analizzatore di rete. Tramite la scheda E-Tibbo, che alloggia in un crate VME, è possibile spedire e ricevere dati sulla rete Ethernet 100 BaseT |
| 5050 | 2007-06-08 | Solenoid Magnet and Flux Return for the \\PP~Detector | 2007 | INFN-BE-07-1.pdf | Andrea Bersani, Renzo Parodi, Andrea Pastorino | In this paper we present the project of the Solenoid Magnet for the PANDA detector developed in Genova. This project features a coil realized with a Rutherford--type, aluminum stabilized superconducting cable, wound inside an aluminum alloy coil former and indirectly cooled with a forced circulation of liquid helium. The concept of this magnet is based on many other working magnets, developed for different detectors, such as BaBar, Finuda, Delphi or CMS. A complete characterization of the magnetic, mechanical and thermal properties of the magnet is presented, with an ansatz on the time schedule to be followed to fulfill the detector deadlines. |
| 5048 | 2007-06-06 | 2006 Annual Report | 2007 | LNF-07-13(IR).pdf | AA.VV | |
| 5047 | 2007-06-06 | Controllo Automatico Dell’illuminazione in un Microscopio per L’Analisi di Emulsioni Nucleari | 2007 | INFN-TC-07-5.pdf | Fabrizio Formisano, Nicola D’Ambrosio | In questa nota viene descritta la progettazione di un controllo automatico dell’illuminazione per i microscopi automatizzati utilizzati nell’esperimento OPERA per l’analisi delle emulsioni nucleari. Le caratteristiche richieste al controllo hanno reso necessarie alcune particolari scelte di progetto per garantire un’alta efficienza e un’ottima qualità dell’emissione luminosa con costi contenuti |
| 5049 | 2007-06-06 | Nota su Windows Vista | 2007 | INFN-CCR-07-7.pdf | Nunzio Amanzi, Silvia Arezzini, Enrico M.V. Fasanelli, Gian Piero Siroli, Giulia Vita Finzi | Il recente rilascio da parte di Microsoft Corp. del nuovo sistema operativo Windows Vista e la contemporanea apparizione sul mercato di computer in cui tale sistema è preinstallato all’atto dell’acquisto, ha alimentato nelle varie Sezioni una dinamica discussione sui primi riscontri e sulle opportunità di utilizzo di questa nuova piattaforma s/w in merito alla quale il Gruppo Windows desidera esprimere il proprio contributo in termini di linee di indirizzo. |
| 5043 | 2007-05-25 | General Computation and Grid TIER2 Toward LHC | 2007 | INFN-CCR-07-3.pdf | Giuseppe Sava, Rosanna Catania, Emidio Giorgio, Gianluca Passaro, Gianni Mario Ricciardi | The “Network Services” working group was planned to improve synergy among the staff of the ‘Computation and Network Division’ and IT specialists of all the national and regional Grid teams operating inside the Department of physics of Catania. So also the IT general services can improve projects and performances:…towards LHC era. |
| 5044 | 2007-05-25 | Ottimizzazioni del Protocollo TCP per Connessioni LHCOPN a 10 GB/S | 2007 | INFN-CCR-07-4.pdf | Marco Bencivenni | L’obiettivo del lavoro è stato quello di verificare le prestazioni e le configurazioni di vari elementi di un sistema di comunicazione a 10 Gb/s (server, interfacce di rete per nodi terminali, linee locali e geografiche sperimentali) al fine di individuare una configurazione ottimale che permetta l’ottimizzazione delle prestazioni di un’applicazione basata sul protocollo di trasmissione TCP. Sono stati quindi individuati una serie di parametri chiave sia di tipo hardware che software, la cui configurazione risulta particolarmente rilevante ai fini delle performance sperimentate. |
| 5045 | 2007-05-25 | Temp Sentry: Un Sistema di Rilevazione Dati Ambientali | 2007 | INFN-CCR-07-5.pdf | Alberto Guerra | Il sistema di condizionamento di una sala macchine è uno dei fattori di maggiore criticità. Attualmente sono ospitate presso la sala calcolo del SICR (Servizio Impianti Calcolo e Reti) della sezione di Roma le risorse informatiche dei gruppi di ricerca operanti in sezione e del polo GARR di Roma. Si tratta di circa 220 server, 30 sistemi di storage, 20 apparati di rete, più svariati monitor e KVM. Il gran numero di apparecchiature ha evidenziato la necessità di rilevare i dati ambientali nel tempo, impostando soglie di allarme, superate le quali deve essere segnalata la variazione di stato. Attualmente il sistema sviluppato rileva la temperatura tramite 3 sonde termiche; i dati sono riportati su grafici disponibili via Web e in caso di superamento della soglia di allarme vengono inviate email di segnalazione. Il prossimo sviluppo previsto aumenterà il numero di sonde termiche, verrà rilevata anche l’umidità e sarà integrato un sistema per l’invio di SMS. Questa nota descrive l’hardware, il programma di gestione degli allarmi e il metodo utilizzato per la pubblicazione su Web dei grafici. |
| 5046 | 2007-05-25 | dCache, Storm/GPFS and DPM: Performance Tests, SRM Compliance, Advanced Configurations | 2007 | INFN-CCR-07-6.pdf | Giacinto Donvito, Vincenzo Spinoso | Grid storage managers represent a new way to deal with large sets of files in a Grid environment. They are growing quickly, meeting LHC experiment requirements; in particular, nowadays they must honour SC4 requirements as a subset of the whole complete set of features to be implemented for 2008. The SRM interfaces are needed, both in version 1 and 2, and higher and higher transfer rates (i.e. in SC4, 100MB/sWAN/disk and 1GB/s inside LAN) can’t be managed through a classic SE. Possible candidates as SRMstorage managers are dCache, DPM and StoRM. This work aims to test installation, configuration, features and limits of those storage managers; the resulting overview will be useful both for Tier 2 sites and dCache/DPM developers, and will represent a basis on which to start a regular testing activity about grid storage management. All the results reported in this note are updated to January 2006. All the software tested is now released in a newer version, with more functionalities added. This work is the result of a working activity born as a requirements of the INFN ”Commissione Calcolo e Reti”. |
| 5042 | 2007-05-22 | High Availability a Basso Costo | 2007 | INFN-CCR-07-2.pdf | Domenico Diacono, Sabino Calò | Lo scopo di questo progetto è quello di portare in produzione servizi erogati in Alta Disponibilità, al fine di ridurre il tempo d’interruzione del servizio allo 0,01%. La caratteristica peculiare rispetto ad altri progetti che ottengono lo stesso risultato è l'utilizzo di componenti hardware e software standard, facilmente reperibili e generalmente più economici. |
| 5041 | 2007-05-21 | NERONE: First Results | 2007 | LNF-07-12(NT).pdf | Marco Cordelli, Roberto Habel, Agnese Martini, Luciano Trasatti | A new instrument designed to measure with high accuracy and without any bias the attenuation length of light in clean water (NERONE) is presented. Several new technical solutions have been used in the design, including a small and cheap motor for deep sea water. The instrument has been debugged during four cruises, from 2001 to 2005. First results are presented, obtained in June 2006 in the Catania test site at a depth of 2000 m. Although some improvement is still necessary, the performance of the instrument was very satisfactory. |
| 5040 | 2007-05-16 | Tecnologia iSCSI – Prime Esperienze | 2007 | INFN-CCR-07-1.pdf | Alessandro Tirel | Questo documento descrive le prove sulla tecnologia iSCSI effettuate presso la Sezione di Trieste. Non tutti gli aspetti del protocollo sono stati testati, sono state valutate in particolare le performance di soluzioni basate su dispositivi hardware e software. Questa attività è stata promossa dal gruppo di lavoro Storage su mandato della Commissione Calcolo e Reti dell’INFN. |
| 5032 | 2007-04-16 | X-Band RF Structure Thermal Analysis and Tests | 2007 | LNF-07-11(P).pdf | V. Chimenti, L. Palumbo, B. Spataro, L.Quintieri, F. Tazzioli | The design of X-band multi-cell RF structures for particle accelerators requires an accurate estimation of the sensitivity to the mechanical deformations induced by the surface power loss on the metallic walls. The prediction of these effects is important for conceiving a tuning strategy that assures the correct structure operation when integrated into the accelerator complex. An experimental technique is proposed for preliminary testing of the mechanical deformations caused by a thermal load that can generate in the RF cavity a temperature gradient profile as close as possible to the real one induced by the electromagnetic power loss. Because we want to find a method that can be easily and cheaply implemented in the laboratory, a thermal radiator with uniform heating power density, placed on the axis of the RF cavity, has been chosen as heating source. A multi-physics finite-element code (ANSYS) has allowed comparing the measured temperature gradients with the computed ones. The good agreement validates the application of the code, which has been extended to the joint solution of the electromagnetic and thermal problem. Thus the sensitivity to deformations can be directly evaluated. |
| 5031 | 2007-04-03 | Experimental study of the $(K^+,K^0)$ interactions on $^7$Li close to threshold | 2007 | LNF-07-10(P).pdf | The FINUDA Collaboration: M. Agnello, G. Beer, L. Benussi, M. Bertani, H.C. Bhang, S. Bianco, G. Bonomi, E. Botta, M. Bregant, T. Bressani, S. Bufalino, L. Busso, D. Calvo, P. Camerini, M. Caponero, P. Cerello, B. Dalena, F. De Mori, G. D'Erasmo, D. Di Santo, D. Elia, F. L. Fabbri, D. Faso, A. Feliciello, A. Filippi, V. Filippini, R. Fini, M. E. Fiore, H. Fujioka, P. Gianotti, N. Grion, O. Hartmann, H.B. Kang, A. Krasnoperov, V. Lenti, V. Lucherini, V. Manzari, S. Marcello, T. Maruta, N. Mirfakhrai, O. Morra, T. Nagae, A. Olin, H. Outa, E. Pace, M. Pallotta, M. Palomba, A. Pantaleo, A. Panzarasa, V. Paticchio, S. Piano, F. Pompili, R. Rui, G. Simonetti, H. So, V. Tereschenko, S. Tomassini, R. Toyoda, R. Wheadon, A. Zenoni | The inelastic charge exchange reaction ($K^+$, $K^0$) on $^7$Li has been experimentally investigated close to threshold with the FINUDA spectrometer at the $e^+e^-$ collider DA$\\Phi$NE by searching for $K^0_S$ decays. It is the first time that this process has been studied at such low momentum. An upper limit of 2.0 mb (at 95$\\%$ Confidence Level) has been measured for the total cross section. |
| 5030 | 2007-04-03 | Electromagnetic Study and Optimization of the Pm-Trips Ion Source and the Related Microwave Line | 2007 | INFN-TC-07-4.pdf | F. Maimone, L. Celona, G. Ciavola, F. Consoli, S. Gammino, S. Barbarino, L. Tumino | The microwave discharge proton source PM-TRIPS (Permanent Magnet TRASCO Intense Proton Source) is under construction at INFN-LNS and its goal is to generate a 40 mA proton current at 80 kV extraction voltage with low emittance and high reliability. In order to improve the performances of such ion source, an electromagnetic study of the whole source with particular care to the microwave coupling and to the high voltage insulation has been carried out by using the Ansoft HFSS™ code and the results are here reported. |
| 5028 | 2007-03-12 | ETRUSCO: Extra Terrestrial Ranging to Unified Satellite COnstellations | 2007 | LNF-07-8(IR).pdf | R. Vittori, A. Boni, C. Cantone, S. Dell’Agnello, G. O. Delle Monache, M. Garattini, N. Intaglietta, C. Lops M. Martini, C. Prosperi, G. Bellettini, R. Tauraso | We describe the basic goals of the ETRUSCO experiment and the work done in 2006, together with our international collaborators, which led to the approval of the proposal by the INFN-CSNV in October 2006. Some of the 2007 funds were made available in November 2006 and were used to buy optical instrumentation. In 2007 the LNF Satellite laser ranging Characterization Facility (SCF) has been upgraded to perform integrated laser ranging tests and thermal measurements (SCF-Test) of the planar retro-reflector arrays installed on the satellites of GNSS constellations. This will be done in a realistic environment, which simulates the orbital conditions of the GPS-2 (USA), GLONASS (Russia), and soon GALILEO (EU), at altitudes of about 20000-23000 Km. The year 2007 has been devoted to the SCF-Test of a prototype model of a retro-reflector deployed on the two of GPS-2 satellites, on the GLONASS constellation and on GIOVE-A and GIOVE-B, the prototypes of GALILEO. This SCF-Test has been successful and data analysis is well underway. The experimental work at the SCF will also be compared to software models of the thermal, structural, orbital and optical behavior of the prototypes. Detailed thermal models of the LAGEOS-type retro-reflectors have already been built and checked with SCF measurements. Work is in progress to develop these models also for the GNSS. The year 2008 is dedicated to the SCF-Test of a flight model of a retro-reflector array to be deployed on one of the next GPS-2 satellites. The long-term goal of ETRUSCO is to perform at LNF the SCF-Test the larger and more important GALILEO laser retro-reflector arrays. Planning and provisions to reach this goal are well underway: in fact, INFN-LNF is participating to a call for tender for the “Support to the Coordination of the European GALILEO Simulation and Testing Infrastructure”, issued by the Galileo Supervisory Authority, in the context of FP7-GALILEO. The result of the tender is due by October 2008. |
| 5027 | 2007-02-27 | Sistema di Remotizzazione KVM Utilizzato al TIER1 CNAF | 2007 | INFN-TC-07-3.pdf | Pier Paolo Ricci | Lo studio e l’utilizzo di un sistema avanzato di remotizzazione di Keyboard Video e Mouse (KVM) all'interno della sala macchine del Tier1 si è reso necessario nel corso degli anni per garantire l’accesso all’alto numero di macchine presenti nella sala. Il motivo principale che ci ha indotti a valutare l’utilizzazione di un tale sistema è il fatto che la sala macchine non è presidiata e si trova ad una certa distanza dagli uffici dove il personale del centro ha sede abituale di lavoro. Il presente articolo intende riportare le varie fasi di studio e realizzazione che si sono susseguite negli scorsi anni al fine di identificare e rendere utilizzabile in produzione un sistema di remotizzazione KVM il più possibile efficiente. A tale proposito vengono riportati inoltre i costi e i fornitori dei vari sistemi utilizzati e i vantaggi e svantaggi che essi hanno evidenziato al fine di voler costituire un breve riferimento per altri centri che intendano usufruire di tali apparati. |
| 5026 | 2007-02-27 | The OPERA Power Distribution System | 2007 | LNF-07-7(NT).pdf | A. Candela, G. Felici, F. Terranova | We describe the power distribution system designed and implemented for the electronic subdetectors (scintillators, RPC/XPC/VETO, drift tubes) and facilities (BMS, DAQ, water cooling plant, magnets) of the OPERA experiment. This note is intended as a technical description of the system and a reference for on-call experts and shifters. |
| 5025 | 2007-02-21 | Total Cross-Section at LHC from Minijets and Soft Gluon Resummation in the Infrared Region | 2007 | LNF-07-6(P).pdf | G. Pancheri and R. Godbole and A. Grau and Y.N. Srivastava | A model for total cross-sections incorporating QCD jet cross-sections and soft gluon resummation is described and compared with present data on $pp$ and ${\\bar p}p$ cross-sections. Predictions for LHC are presented for different parameter sets. It is shown that they differ according to the small x-behaviour of available parton density functions. |
| 5024 | 2007-02-20 | SuperB, a High-Luminosity Heavy Flavour Factory: Conceptual Design Report | 2007 | INFN-AE-07-2.pdf | M.~Bona, J.~Garra Tic'o’, , E.~Graug'es Pous, P.~Colangelo, F.~De Fazio, A.~Palano, M.~Manghisoni, V.~Re, G.~Traversi, G.~Eigen, M.~Venturini, N.~Soni, M.~Bruschi, S.~De Castro, P.~Faccioli, A.~Gabrielli, B.~Giacobbe, N.~Semprini Cesari, R.~Spighi, M.~Villa, A.~Zoccoli, C.~Hearty, J.~McKenna, A.~Soni, A.~Khan, }, A.Y.~Barniakov, M.Y.~Barniakov, V.E.~Blinov, V.P.~Druzhinin, V.B.~Golubev, S.A.~Kononov, I.A.~Koop, E.A.~Kravchenko, E.B.~Levichev, S.A.~Nikitin, A.P.~Onuchin, P.A.~Piminov, S.I.~Serednyakov, D.N.~Shatilov, Y.M.~Shatunov, Y.I.~Skovpen, E.P.~Solodov, C.-H.~Cheng, B.~Echenard, F.~Fang, D.G.~Hitlin, F.C.~Porter, T.N.~Pham, R.~Fleischer, G.F.~Giudice, T.~Hurth, M.~Mangano, G.~Mancinelli, B.T.~Meadows, A.J.~Schwartz, M.D.~Sokoloff, A.~Soffer, C.D.~Beard, T.~Haas, R.~Mankel, G.~Hiller, P.~Ball, M.~Pappagallo, M.R.~Pennington, W.~Gradl, S.~Playfer, A.~Abada, D.~Becirevic, S.~Descotes-Genon, O.~P`ene, D.~Andreotti, M.~Andreotti, D.~Bettoni, C.~Bozzi, R.~Calabrese, A.~Cecchi, G.~Cibinetto, P.~Franchini, E.~Luppi, M.~Negrini, A.~Petrella, L.~Piemontese, E.~Prencipe, V.~Santoro, G.~Stancari, F.~Anulli, R.~Baldini-Ferroli, M.E.~Biagini, M.~Boscolo, A.~Calcaterra, A.~Drago, G.~Finocchiaro, S.~Guiducci, G.~Isidori, S.~Pacetti, P.~Patteri, I.M.~Peruzzi, M.~Piccolo, M.A.~Preger, P.~Raimondi, M.~Rama, C.~Vaccarezza, A.~Zallo, M.~Zobov, R.~de Sangro, A.~Buzzo, M.~Lo Vetere, M.~Macr'i, M.R.~Monge, S.~Passaggio, C.~Patrignani, E.~Robutti, S.~Tosi, J.~Matias, W.~Panduro Vazquez, F.~Borzumati, V.~Eyges, S.A.~Prell, T.K.~Pedlar, S.~Korpar, R.~Pestotnik, M.~Stariv c, M.~Neubert, A.G.~Denig, U.~Nierste, T.~Agoh, K.~Ohmi, Y.~Ohnishi, J.R.~Fry, C.~Touramanis, A.~Wolski, B.~Golob, P.~Kriv’zan, H.~Flaecher, A.J.~Bevan, F.~Di Lodovico, K.A.~George, R.~Barlow, G.~Lafferty, A.~Jawahery, D.A.~Roberts, G.~Simi, P.M.~Patel, S.H.~Robertson, A.~Lazzaro, F.~Palombo, A.~Kaidalov, A.J.~Buras, C.~Tarantino, G.~Buchalla, A.I.~Sanda, , G.~D'Ambrosio, G.~Ricciardi, I.~Bigi, C.P.~Jessop, J.M.~LoseccoK.~Honscheid, N.~Arnaud, R.~Chehab, Y.~Fedala, F.~Polci, P.~Roudeau, V.~Sordini, V.~Soskov, A.~Stocchi, A.~Variola, A.~Vivoli, G.~Wormser, F.~Zomer, A.~Bertolin, R.~Brugnera, N.~Gagliardi, A.~Gaz, M.~Margoni, M.~Morandin, M.~Posocco, M.~Rotondo, F.~Simonetto, R.~Stroili, G.R.~Bonneaud, V.~Lombardo, G.~Calderini, L.~Ratti, V.~Speziali, M.~Biasini, R.~Covarelli, E.~Manoni, L.~Servoli, C.~Angelini, G.~Batignani, S.~Bettarini, F.~Bosi, M.~Carpinelli, R.~Cenci, A.~Cervelli, M.~Dell'Orso, F.~Forti, P.~Giannetti, M.~Giorgi, A.~Lusiani, G.~Marchiori, M.~Massa, M.A.~Mazur, F.~Morsani, N.~Neri, E.~Paoloni, F.~Raffaelli, G.~Rizzo, J.~Walsh, V.~Braun, A.~Lenz, G.S.~Adams, I.Z.~Danko, E.~Baracchini, F.~Bellini, G.~Cavoto, A.~D'Orazio, D.~Del Re, E.~Di Marco, R.~Faccini, F.~Ferrarotto, M.~Gaspero, P.~Jackson, G.~Martinelli, M.A.~Mazzoni, S.~Morganti, G.~Piredda, F.~Renga, L.~Silvestrini, C.~Voena, L.~Catani, A.~Di Ciaccio, R.~Messi, E.~Santovetti, A.~Satta, M.~Ciuchini, V.~Lubicz, F.F.~Wilson, R.~Godang, X.~Chen, H.~Liu, W.~Park, M.~Purohit, A.~Trivedi, R.M.~White, J.R.~Wilson, M.T.~Allen, D.~Aston, R.~Bartoldus, S.J.~Brodsky, Y.~Cai, J.~Coleman, M.R.~Convery, S.~DeBarger, J.C.~Dingfelder, G.P.~Dubois-Felsmann, S.~Ecklund, A.S.~Fisher, G.~Haller, S.A.~Heifets, J.~Kaminski, M.H.~Kelsey, M.L.~Kocian, D.W.G.S.~Leith, N.~Li, S.~Luitz, V.~Luth, D.~MacFarlane, R.~Messner, D.R.~Muller, Y.~Nosochkov, A.~Novokhatski, M.~Pivi, B.N.~Ratcliff, A.~Roodman, J.~Schwiening, J.~Seeman, A.~Snyder, M.~Sullivan, J.~Va'Vra, U.~Wienands, W.~Wisniewski, H.~Stoeck, H.-Y.~Cheng, H.-N.~Li, Y.-Y.~Keum, M.~Gronau, Y.~Grossman,F.~Bianchi, D.~Gamba, P.~Gambino, F.~Marchetto, E.~Menichetti, R.~Mussa, M.~Pelliccioni, G.F.~Dalla Betta, M.~Bomben, L.~Bosisio, C.~Cartaro, L.~Lanceri, L.~Vitale, V.~Azzolini, J.~Bernabeu, N.~Lopez-March, F.~Martinez-Vidal, D.A.~Milanes, A.~Oyanguren, P.~Paradisi, A.~Pich, M.A.~Sanchis-Lozano, R.~Kowalewski, J.M.~Roney, J.~Back, T.J.~Gershon, P.F.~Harrison, T.E.~Latham, G.B.~Mohanty, A.A.~Petrov, M.~Pierini, | This Conceptual Design Report presents a detailed program of high statistics heavy flavour physics that has sensitivity to physics beyond the Standard Model through the measurement of CP-violating asymmetries, rare decay branching fractions, and kinematic distributions affected by new heavy particles in the loops of second order diagrams. These studies would be carried out at a novel new accelerator, SuperB, an asymmetric e+e- collider designed to exploit small emittance beams and strong focusing to obtain a luminosity in excess of 1036 cm-2 s-1 at the Y(4S) energy, two orders of magnitude higher than what has been achieved at the two existing B-Factories. The design of the SuperB collider and of an upgraded detector capable of carrying out the physics program are described in detail |
| 5023 | 2007-02-01 | Conceptual Design of an Intense Neutron Source for Time-of-Flight Measurements | 2007 | LNF-07-5(P).pdf | S. Bartalucci, V. Angelov, K. Drozdowicz, D. Dworakc, G. Tracz | Among the accelerator-based neutron sources, the ones which are driven by electron Linacs still appear quite attractive, notably in the case of cross section measurements with the time-of-flight method. This is due to their better beam quality and economy aspects, which make them complementary, rather than inferior to the hadron (protons, deuterons) driven spallation facilities. A conceptual design study of a powerful neutron source has been developed, aiming at the implementation on a future normal- or super-conducting Linac to be built in the Rome Research Area, but keeping enough flexibility for being installed on any high energy linac. We report in this paper on the first simulation results, mainly about the general design of the target-moderator assembly and the radiation shielding. |
| 5022 | 2007-01-31 | Configurazione dei Servizi di Posta Elettronica per la Sezione INFN di Genova | 2007 | INFN-TC-07-2.pdf | Alessandro Brunengo, Mirko Corosu | Viene di seguito descritta la scelta degli applicativi e delle configurazioni hardware e software per dotare la sezione INFN di Genova di un servizio di posta elettronica affidabile e dotato delle funzionalita’ ritenute idonee al lavoro dell’utenza del Servizio Calcolo locale. La realizzazione dei vari servizi descritti sono il risultato di approssimazioni successive che ha raggiunto un livello di stabilita’ e di prestazioni idoneo alle funzionalita’ richieste, e potenzialmente scalabile entro un ordine di grandezza senza sostanziali rivoluzioni della architettura. Come vedremo i requisiti imposti al sistema, in particolare quello di indipendenza delle macchine coinvolte da altri servizi che non fossero l’infrastruttura di rete, ha reso necessaria una configurazione opportuna anche di servizi di rete potenzialmente indipendenti dalla posta elettronica, quali DNS ed authentication service. Le scelte operate non sono le uniche possibili, ma sono tra quelle ritenute idonee a dotare la sezione di un servizio che offre le funzionalita’ desiderate, trovando un equilibrio tra le esigenze di ridondanza e quella di non eccedere nella complessita’ del sistema, sia per contenere i costi che per limitare il man power necessario alla gestione hardware e software. |
| 5020 | 2007-01-29 | Beam-Beam Issues for Colliding Schemes with Large Piwinski Angle and Crabbed Waist | 2007 | LNF-07-3(IR).pdf | Pantaleo Raimondi, Dmitry Shatilov, Mikhail Zobov | Numerical simulations have shown that a recently proposed “crabbed waist” scheme of beam-beam collisions can substantially increase the luminosity of a collider. In this paper we give a qualitative explanation why this scheme works. For this purpose we use simple geometrical considerations and analyze peculiar properties of vertical motion modulations by synchrotron and horizontal betatron oscillations. It is shown that in the 'crabbed waist' scheme these modulations, which are the main sources of beam-beam resonances excitation, are significantly suppressed. Some numerical examples demonstrating the effect of the crabbed waist collisions are also given. |
| 5021 | 2007-01-29 | The RAP Cryogenics | 2007 | LNF-07-4(IR).pdf | Carlo Ligi, Sam Masa Vinko | The cryogenic setup of the RAP (Rivelazione Acustica di Particelle) experiment is described. The liquid helium cryostat operation, together with the commissioning of the dilution refrigerator, is reported. |
| 5019 | 2007-01-26 | Servizio di Posta Elettronica ad Alta Affidabilità | 2007 | INFN-TC-07-1.pdf | Alessandro Tirel, Claudio Strizzolo | Questo documento descrive la realizzazione di un sistema cluster dedicato alla fornitura di servizi ad alta affidabilità. In particolare verrà analizzata un'applicazione relativa al servizio di posta elettronica, il quale rappresenta un elemento ad elevata criticità all'interno di ogni sede dell'INFN. Tra le caratteristiche salienti della struttura descritta: l'utilizzo della tecnologia Fibre Channel; l'implementazione della Red Hat Cluster Suite; l'autenticazione tramite protocollo LDAP e l'attivazione di caselle di posta virtuali. |
| 5018 | 2007-01-23 | A Neural Network Approach to High Energy Cosmic Rays Mass Identification | 2007 | INFN-AE-07-1.pdf | Simone Riggi, Rossella Caruso, Antonio Insolia, Mario Scuderi | An event-by-event study, based on neural network methods, of the mass identification in high energy cosmic rays was carried out with simulated data, in order to check the possibility of analyzing real data measured at the Pierre Auger Observatory. Extensive air showers were simulated with the CORSIKA code, using the hadronic model QGSJET98. The goodness of the method in recognizing the mass of the primary was tested making use of the parameters extracted from the simulated longitudinal profiles. We showed that the designed supervised neuralnetwork is able to discriminate, with high identification efficiency and purity, between proton- and iron-induced showers. We tested our method also in presence of a four components primary flux (proton, helium, oxygen, and iron). Typical results for the classification matrix obtained are presented and discussed. |
| 5017 | 2007-01-11 | MoonLIGHT-R: MOON LASER INSTRUMENTATION FOR GENERAL RELATIVITY HIGH-ACCURACY TESTS An ASI study for a robotic mission on the Moon | 2007 | LNF-07-2(IR).pdf | G. Bellettini, C. Cantone, S. Dell’Agnello (Co-PI), G. O. Delle Monache, M. Garattini, N. Intaglietta, D. G. Currie (Co-PI),R. Vittori | New robotic lunar landings may take place during next decade. The Italian Space Agency (ASI) has requested proposals for interesting and compelling physics experiments to be performed with the severe weight, size, power and deployment restrictions inherent to lunar sorties. MoonLIGHT-R is a proposal for improving by a factor 1000 or more the accuracy of the current Lunar Laser Ranging (LLR) experiment, performed since 1969 with retro-reflector arrays deployed by Apollo 11, 14 and 15. LLR is the only Apollo experiment still taking data today. Achieving this goal requires a new, different thermal, optical and mechanical design of the retro-reflector array and detailed simulations and experimental tests. MoonLIGHT-R is a light, compact, very-long lasting, maintenance-free and completely passive payload. MoonLIGHT-R will perform accurate tests of General Relativity (GR) already with the existing ILRS systems (like ASI-MLRO) . This accuracy will get better and better as laser technologies improve over the next few decades, like they did relentlessly since the invention of the laser in the ‘60s. A specific cosmological model, which explains the acceleration of the Universe via modified GR at very large distances, can be fully tested by measuring an anomalous precession of the Moon perigee. A high scientific return is guaranteed. We are committed to the space-climatic and laser-optical simulation (and, at a later stage, experimental characterization) of the new LLR array using the LNF Space Climatic Facility (SCF). The payload construction and deployment is an opportunity for the national industries. Preliminary space-climatic simulations and payload specs are presented in this LNF report. |
| 5016 | 2007-01-08 | Coupling Impedances Studies and Measurements of the COLDEX Upgraded Vacuum Chamber | 2007 | LNF-07-1(P).pdf | D.~Alesini, B.~Spataro, M.~Migliorati, A.~Mostacci, L.~Palumbo, V.~Baglin, B.~Jenninger, F.~Ruggiero | The coupling impedances of the upgraded beam screen and cold/warm transition of the cold bore experiment (COL\\-DEX) vacuum chamber installed in the SPS machine are investigated. Detailed studies of the coupling impedances budget of the beam screen circular vacuum chamber with narrow longitudinal slots and the cold/warm transition are discussed. A comparison with the experimental tests is also presented |
| 5014 | 2006-12-19 | Qualification of a Thermal GAP Filler to be Used as Electronics to Structure Interface | 2006 | INFN-TC-06-18.pdf | S. Cerchi, S. Cuneo, S. Minutoli, P. Musico, E. Robutti, D. Torazza, | A thermal gap filler has been selected, and its performance measured before and after irradiation, to qualify it for the use in TOTEM T1 telescope. Experimental results are presented and commented. |
| 5013 | 2006-12-13 | DAFNE Upgrade for Siddharta Run | 2006 | LNF-06-33(IR).pdf | D. Alesini, D. Babusci, M.E. Biagini, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. Delle Monache, G. Di Pirro, A. Drago, A. Gallo, S. Guiducci, M. Incurvati, C. Ligi, F. Marcellini, G. Mazzitelli, C. Milardi, L. Pellegrino, M. Preger, L. Quintieri, P. Raimondi, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov, A. D'Angelo, R. Messi, D. Moricciani, S. Bettoni, I. Koop, E. Levichev, P. Piminov, D. Shatilov, V. Smaluk | |
| 5012 | 2006-12-12 | Simulation of the Thermo-Optical Properties of the Lares and Lageos Satellites for a Precise Measurement of the Lense-Thirring Effect in General Relativity | 2006 | LNF-06-32(Thesis).pdf | Student: Arianna Bosco; Thesis Advisor: Prof. G. Bellettini; Co-Thesis Advisor: Ing. G. O. Delle Monache | |
| 5011 | 2006-12-04 | The Realization of an Optic Fiber Air Backed Mandrel Hydrophone for Frequencies up to 20 KHz | 2006 | INFN-TC-06-17.pdf | M. Anghinolfi, A. Calvi, A. Cotrufo, M. Ivaldi, O. Yershova, F. Parodi, D. Piombo, A. Plotnikov and L. Repetto | We describe how we have realized the prototype of an optic fiber air backed mandrel hydrophone designed to measure frequencies up to 20 kHz. The characteristics of the materials we have selected, the procedure of winding the optic fibers and the coating process are described in detail. |
| 5010 | 2006-11-27 | Studio dei Materiali e Interazione con i Gas Presenti nei Rilevatori a Muoni per l’Esperimento CMS | 2006 | LNF-06-31(Thesis).pdf | Laureando: Cristiano Pucci; Relatore: Prof. Antonio Paolozzi; Co–Relatore: Dr. Luigi Benussi | |
| 5009 | 2006-11-20 | A Beta Beam Complex Based on the Machine Upgrades for the LHC | 2006 | LNF-06-30(P).pdf | A.~Donini, E.~Fernandez-Martinez, P.~Migliozzi, S.~Rigolin, L. Scotto Lavina, T. Tabarelli de Fatis, F.~Terranova | The Beta Beam CERN design is based on the present LHC injection complex and its physics reach is mainly limited by the maximum rigidity of the SPS. In fact, some of the scenarios for the machine upgrades of the LHC, particularly the construction of a fast cycling 1~TeV injector (``Super-SPS''), are very synergic with the construction of a higher $\\gamma$ Beta Beam. At the energies that can be reached by this machine, we demonstrate that dense calorimeters can already be used for the detection of $\\nu$ at the far location. Even at moderate masses (40 kton) as the ones imposed by the use of existing underground halls at Gran Sasso, the CP reach is very large for any value of $\\theta_{13}$ that would provide evidence of $\\nu_e$ appearance at T2K or NO$\\nu$A ($\\theta_{13}\\geq 3^\\circ$). Exploitation of matter effects at the CERN to Gran Sasso distance provides sensitivity to the neutrino mass hierarchy in significant areas of the $\\theta_{13}-\\delta$ plane. |
| 5008 | 2006-11-07 | Fluorescence Analysis by Spectroscopy Transmission and Electron Streak Camera (FASTEST-CAM. A proposal for detecting time-synchronized ultra-fast light phenomena | 2006 | LNF-06-29(IR).pdf | Andrea La Monaca, Giorgio Cappuccio, Roberto De Masi, Andrea Maria Di Lellis, Paolo Di Muro, Roberto Favilla, Fabrizio Fiori, Pasqualino Gaudio, Michele Maffia, Paolo Mariani, Alberto Mazzini, Ivan Micetich, Domenico Nanni, Maria Richetta, Franco Rustichelli, Benedetto Salvato, Francesco Spinozzi | Aim of FASTEST-CAM experiment is to develop and build at Frascati a new instrumentation for detecting ultra-fast light phenomena in a large frequency spectrum extended from X-rays to infrared. The apparatus is based on a customized 'streak camera', realized at reasonable cost and using an architecture open to future applications (e. g. Adrontherapy). The instrumentation will be applied: 1) to carry out fluorescence measurements of complex systems with very high time and space resolutions, using a monochromatic UV beam of wavelength 280 nm of synchrotron radiation of DAΦNE; 2) for diagnosing movement instabilities of the electron bunches and time-space emission fluctuations of the light pulses delivered by the machine or by the new ultra fast light sources, FEL, in development in LNF. |
| 5007 | 2006-11-01 | MoonLIGHT-M: Moon Laser Instrumentation for General Relativity High-Accuracy Tests | 2006 | LNF-06-28(IR).pdf | G. Bellettini, C. Cantone, S. Dell’Agnello, G. O. Delle Monache, M. Garattini, N. Intaglietta | New manned lunar landings may take place during next decade. In view of this possibility, space agencies around the word have requested to the international scientific community proposals for interesting and compelling physics experiments to be performed with the severe weight, size, power and deployment restrictions inherent to the first lunar sorties. Answering the recent NASA call “Suitcase Science to the Moon”, a group formed by INFN-LNF, Astronaut Roberto Vittori of the Italian Air Force and several US research institutions has presented a proposal for improving by a factor 1000 or more the accuracy of the current Lunar Laser Ranging (LLR) experiment (performed in the last 37 years using the retro-reflector arrays deployed on the Moon by the Apollo 11, 14 and 15 missions). Achieving such an improvement requires a modified thermal, optical and mechanical design of the retro-reflector array and detailed experimental tests. The new experiment will allow a rich program of accurate tests of General Relativity already with current laser ranging systems. This accuracy will get better and better as the performance of laser technologies improve over the next few decades, like they did relentlessly since the ‘60s. The LNF group has committed itself to perform the full climatic simulation and experimental characterization of the new retro-reflector prototypes using the new INFN-LNF “Space Climatic Facility” (SCF). Preliminary simulations are reported in this document. The space-climatic, laser-optical studies and tests will be done by members of this ITALY-US collaboration, because they are deeply linked to the proposed physics measurements. For the mechanics support structures and the “suitcase” there is window of work opportunity for industries. This internal LNF report (pages 2-21) is an excerpt from the Proposal presented to NASA on October 27 2006 by the authors listed at page 2. MoonLIGHT-M is the internal LNF name given to this Proposal (where “-M” indicates that this is intended for a Manned mission) |
| 5006 | 2006-10-20 | Disegno e Layout di un OP-AMP Full Custom in Tecnologia da 0.35μ | 2006 | INFN-TC-06-16.pdf | S. Energico | Questa nota descrive passo passo la procedura di layout di un amplificatore operazionale in tecnologia da 0,35 micron utilizzando Cadence con l’Hit-Kit 3.70 dell’AMS. Viene confrontata la simulazione pre-layout con quella post-layout e viene dimostrato che con un’accurata disposizione dei componenti le differenze tra le due simulazioni sono molto piccole. |
| 5003 | 2006-10-17 | Strategie per l’Update Management Process | 2006 | INFN-TC-06-13.pdf | Francesca Del Corso | L’articolo si propone di illustrare le metodologie per il sofware update ed il Security Patch Management su piattaforma Microsoft mostrando quali sono i processi, i tool e le utility per tenere aggiornati i propri sistemi minimizzando l’occorrenza e la gravità di possibili attacchi che sfruttino le vulnerabilità presenti sui sistemi. Il documento contiene inoltre una panoramica dei test effettuati presso la sezione INFN di Firenze e sull’attuale ambiente di produzione, proponendosi come linea guida e di consultazione per le altre sezioni INFN. |
| 5004 | 2006-10-17 | A Fiber Optic Air Backed Mandrel Hydrophone to Detect High Energy Hadronic | 2006 | INFN-TC-06-14.pdf | M. Anghinolfi, A. Calvi, A. Cotrufo, M. Ivaldi, O. Yershova, F. Parodi, D. Piombo, A. Plotnikov and L. Repetto | We have studied the design of an air-backed optic fiber hydrophone. With respect to the previous models, this prototype is optimized to provide a band width sufficiently large to detect acoustic signals produced by high energy hadronic showers in water. After a discussion on the geometrical configuration and on the choice of the materials we evaluate the expected performances on the basis of simple analytical calculations. |
| 5005 | 2006-10-17 | AMS 14C Measurements At Labec on Viri (Fifth International Radiocarbon Inter-Comparison) Samples | 2006 | INFN-TC-06-15.pdf | Agnese Cartocci, Mariaelena Fedi, Marco Manetti, Francesco Taccetti | Since May 2004, the Accelerator Mass Spectrometry (AMS) beam line of the new 3 MV Tandetron accelerator of LABEC laboratory in Florence has been in operation. The line, equipped with the necessary hardware for 14C, 10Be, 26Al and 129I measurements, has been used only for radiocarbon measurements so far. We have been involved both in measurements on test samples and in dating applications in collaboration with Universities and other Institutions. After a brief description of the AMS beam line, we report on a set of radiocarbon measurements performed on samples of the Fifth International Radiocarbon Inter-comparison (VIRI) campaign. This campaign, coordinated by the Department of Statistics of the University of Glasgow, basically involves all the radiocarbon laboratories worldwide, both AMS and conventional beta-counting ones. Our data have been here compared to the statistical distributions of all collected data (average values and standard deviations). |
| 5002 | 2006-10-01 | Proposal for a Systematic Study of the CERN Closed Loop Gas System Used by the RPC Muon Detectors in CMS | 2006 | LNF-06-27(IR).pdf | M. Abbrescia, A. Colaleo, R. Guida, G. Iaselli, R. Liuzzi, F. Loddo, M. Maggi, B. Marangelli, S. Natali, S. Nuzzo, G. Pugliese, A. Ranieri, F. Romano, R. Trentadue, L. Benussi, M. Bertani, S. Bianco, M.A. Caponero, D. Colonna, D. Donisi, F.L. Fabbri, F. Felli, M. Giardoni, B. Ortenzi, M. Pallotta, A. Paolozzi, L. Passamonti, B. Ponzio, C. Pucci, G. Saviano, G. Polese, I. Segoni, N. Cavallo, F. Fabozzi, P. Paolucci, D. Piccolo, C. Sciacca, G. Belli, A. Grelli, M. Necchi, S.P. Ratti, C. Riccardi, P. Torre, P. Vitulo | We propose to study features, optimization and commissioning of the CERN Closed Loop gas system used by the RPC muon detectors in experiment CMS at the LHC. Studies include a three-phase campaign both in low-radiation (cosmic rays at the CERN ISR test site) and high-radiation (at the CERN Gamma Irradiation Facility) environment. We describe dedicated RPC chambers tests and chemical analysis of filters and gas used which will allow us to fully characterize the Closed Loop system in view of the upcoming commissioning of the CMS RPC detector. |
| 5000 | 2006-09-14 | Un Operazionale Full Custom in Tecnologia 0.35 Micron | 2006 | INFN-TC-06-12.pdf | P. Parascandolo, V. Sipala | Nella progettazione analogica full custom il progettista lavora a livello del transistor singolo sia nel disegno dello schema elettrico che nella definizione del corrispondente layout. A partire da determinate specifiche, il progettista sceglie lo schema elettrico che meglio risponda alle richieste. Si dimensionano i singoli transistor e se ne simula il comportamento. Stabilite le caratteristiche elettriche del progetto si passa alla realizzazione del layout, vale a dire del disegno che permette la definizione delle maschere per l’implementazione del circuito sul silicio. Questa nota descrive la progettazione con calcoli analitici dello schema elettrico di un amplificatore operazionale e le simulazioni dello stesso, utilizzando il programma “Virtuoso” proprietario di Cadence e confronta i risultati delle simulazioni con il calcolo teorico. L’amplificatore è un VLSI (Very Large Scale Integration) realizzato in tecnologia CMOS da 0.35 micron dalla AMS (AustriaMicroSystems). |
| 5001 | 2006-09-14 | Applicazioni Tecnologiche della Camera Spaziale Climatica dei Laboratori Nazionali di Frascati | 2006 | LNF-06-26(IR).pdf | G. Bellettini, A. Bosco, C. Cantone, I. Ciufolini, D. Currie, S. Dell’Agnello, G. Delle Monache, M. A. Franceschi, M. Garattini, T. Napolitano, A. Paolozzi, E. C. Pavlis, D. P. Rubincam, V. J. Slabinski, R. Tauraso | La Camera Spaziale Climatica (CSC) dei LNF è un progetto integrato di fisica fondamentale e di trasferimento tecnologico alle attività civili ed industriali. Nella CSC, infatti, si misurano le caratteristiche termiche ed ottiche delle componenti dei satelliti LAGEOS I e II (già operativi) e la loro evoluzione LARES (da realizzare ai LNF). Lo scopo è quello di migliorare l’accuratezza della misura del trascinamento dello spazio-tempo in Relatività Generale (effetto Lense-Thirring) e delle applicazioni tecnologiche di Geodesia Spaziale, grazie al nuovo satellite LARES ed alla CSC. La traiettoria orbitale viene determinata con la tecnica dell’inseguimento via laser dei satelliti da Terra (“Satellite Laser Ranging”, SLR). L’applicazione tecnologica più importante è il contributo fondamentale alla definizione del sistema internazionale di riferimento e di posizione terrestre (ITRF, Intern. Terrestrial Reference Frame), emesso dallo IERS (Intern. Earth rotation and Reference systems Service). Esso è lo standard per tutte le attività civili, industriali e scientifiche, a Terra e nello spazio, che necessitano di un sistema di riferimento assoluto. Le misure effettuate nella CSC saranno, inoltre, estremamente utili all’integrazione tra GNSS (Global Navigation Satellite System) ed SLR, che avrà compimento sulle future costellazioni GALILEO (Europa, ≥ 2008) e GPS-3 (USA, ≥ 2011). SLR fornisce il sistema di riferimento assoluto ed il GNSS permette la navigazione in tempo reale rispetto ad esso: il meglio delle due tecnologie, dallo spazio per la Terra. |
| 4998 | 2006-09-13 | Probing Gravity in Neo with High-Accuracy Laser-Ranged Test Masses | 2006 | LNF-06-24(P).pdf | A. Bosco, C. Cantone, S. Dell’agnello, G. O. Delle Monache, M. A. Franceschi, M. Garattini, T. Napolitano, I. Ciufolini, S. Negri, A. Agneni, F. Graziani, P. Ialongo, A. Lucantoni, A. Paolozzi, I. Peroni, G. Sindoni, G. Bellettini, R. Tauraso, E. C. Pavlis, D. G. Currie , D. P. Rubincam, D. A. Arnold, R. Matzner, V. J. Slabinski | Gravity can be studied in detail in Near Earth Orbits (NEO) using laser-ranged test masses tracked with few mm accuracy by ILRS. The two LAGEOS satellites have been used to measure frame dragging (a truly rotational effect predicted by GR) with a 10% error. A new mission and an optimized, second generation satellite, LARES (I. Ciufolini PI), is in preparation to reach an accuracy of 1% or less on frame dragging, to measure some PPN parameters, to test the 1/r2law in very weak field and, possibly, to test select models of unified theories (using the perigee). This requires a full thermal analysis of the test mass and an accurate knowledge of the asymmetric thermal thursts due to the radiation emitted by Sun and Earth. A Space Climatic Facility (SCF) has been built at INFN-LNF (Frascati, Italy) to perform this experimental program on LAGEOS and LARES prototypes. It consists of a 2 m ×1 m cryostat, simulators of the Sun and Earth radiations and a versatile thermometry system made of discrete probes and an infrared digital camera. The SCF commissioning is well underway. A test of all its sub-systems has been successfully completed on August 4, 2006, using a LAGEOS 3 ×3 retro-reflector array built at LNF. This prototype has been thermally modeled in detail with a commercial simulation software. We expect to demonstrate the full functionality of the SCF with the thermal characterization of this LAGEOS array by the beginning of September 2006. Keywords: gravitomagnetism; climatic test; thermal analysis. |
| 4999 | 2006-09-13 | DAFNE Monitored by FINUDA | 2006 | LNF-06-25(P).pdf | M. Agnello, L. Benussi, M. Bertani, H.C. Bhang, S. Bianco, G. Bonomi, E. Botta, M. Bregant, T. Bressani, L. Busso, D. Calvo, P. Camerini, P. Cerello, B. Dalena, F. De Mori, G. D'Erasmo, D. Di Santo, D. Elia, F. L. Fabbri, D. Faso, A. Feliciello, A. Filippi, V. Filippini, R. Fini, M. E. Fiore, H. Fujioka, P. Gianotti, N. Grion, B. Kang, A. Krasnoperov, V. Lucherini, V. Lenti, V. Manzari, S. Marcello, T. Maruta, N. Mirfakhrai, O. Morra, T. Nagae, H. Outa, E. Pace, M. Pallotta, M. Palomba, A. Pantaleo, A. Panzarasa, V. Paticchio, S. Piano, F. Pompili , R. Rui, G. Simonetti , H. So, V. Tereschenko, S. Tomassini, R. Wheadon, A. Zenoni | The FINUDA spectrometer, devoted to hypernuclear physics and installed on the DA$\\Phi$NE two rings collider at the Laboratori Nationali di Frascati, is able to monitor the relevant machine parameters, as luminosity, collision vertexes, c.m. energy and transversal momentum boost, during the process of data taking to study hypernuclear physics without affecting it. The collider parameters relevant to optimize the machine performances to the needs of the experiment are measured both on-line and off-line in a run-to-to run basis, in an efficient, redundant way, allowing the continuous extraction of reliable and cross-checked information on the machine working conditions. |
| 4997 | 2006-09-07 | Papers presented at EPAC 2006 | 2006 | LNF-06-23(P).pdf | Accelerator Division | |
| 4996 | 2006-08-29 | Hadron Properties in the Nuclear Medium -- the PANDA Program with $\\overline{\\mbox{p}}$A Reactions | 2006 | LNF-06-22(P).pdf | Olaf N.~Hartmann | The PANDA experiment at FAIR comprises the possibility to study antiproton annihilations on nuclear targets. Such reactions are ideally suited to investigate the in-medium-potential of hadrons -- charmed mesons, charmonium, antikaons, antibaryons -- making use of the PANDA detector system to detect the final state particles. The paper discusses connected experimental results, predictions i.a. for the so far unexplored region of the charm quark mass, and the intended experimental procedure. |
| 4995 | 2006-07-20 | Optimal Strategy for the Search of Coincident Events Between EXPLORER and NAUTILUS | 2006 | LNF-06-21(IR).pdf | G. Modestino, G.Pizzella and F.Ronga, for the ROG Collaboration | In order to compare the efficiency of two different acquisition times for the detection of coincident pulse signals, analyses of real data of the bar-detectors are performed. For each of the two gravitational wave detectors, EXPLORER and NAUTILUS, statistical results on coincident signals wIth selected cosmic ray events are presented for 3.2 ms and $200~\\mu s$ sampling times of acquisition. |
| 4994 | 2006-07-17 | Electrochemical Compression of Hydrogen inside a PD-AG Thin Wall Tube, by Alcohol-Water Electrolyte | 2006 | LNF-06-20(P).pdf | Francesco Celani, A. Spallone, P. Marini, V. Di Stefano, M. Nakamura, V. Andreassi, A. Mancini, E. Righi, G. Trenta, E. Purchi, U. Mastromatteo, E. Celia, F. Falcioni, M. Marchesini, E. Novaro, F. Fontana, L. Gamberale, D. Garbelli, P.G. Sona, F. Todarello, G. D’agostaro, P. Quercia | Yoshiaki Arata (Osaka University) has since 1955 developed and on 1994 patented in Japan (also USA, N° 5647970, 1997) a procedure for producing ultrahigh pressure H/D gas, based on the electrolytic loading of a hollow cathode made of a Hydrogen and/or Deuterium absorbing material (Pd). The truthfulness of Arata’s results and even the real existence of Arata’s device have been recently challenged by an influent Italian scientist and suspected to be merely a “computer simulation experiment”. Accordingly, we decided to replicate the Arata experiment in order to confirm his results. A further reason for such a replication is due to the consideration that the electrolytic compression of Deuterium (D) is the basic for most of the Cold Fusion experiments. Moreover, the experiment allows for a direct evaluation of the D2 (or H2) pressure inside the hollow cathode, without making use of indirect measurements, like those based on the well-known “Baranowsky curve” (change of the Pd electrical resistance, versus D or H absorption). The cathode was a Pd-Ag (75%-25%) tube, closed at one end (diameter 10mm, total length 10cm, useful length exposed to electrolyte 9cm) with a very thin wall (thickness about 50μm), previously used as a Hydrogen purifier (home-made by Dr. Silvano Tosti: ENEA, Frascati, Italy). The effective volume of the Pd-Ag tube (partially filled with a porous ceramic tube, in order to avoid the vacuum collapse of the Pd-Ag tube), pipes, valves and pressure gauges was about 18ml. The anode was a Pt (purity >99.99%) wire (diameter 0.25mm) wounded as a pseudo-cylindrical spiral of radius about 4cm. The total length of the Pt wire was about 200cm, number of turns about 5. The volume of the electrolyte was about 2000ml. The cell was commercial glass (Pyrex type). The solution, according to our long experience in this field, was alcohol-water type (C2H5OH 85-90%, H2O 15-10%) electrolyte. Th(NO3)4 (in 5% wt HNO3), SrCl2 and Hg2SO4 salts were added. Th and Sr salts were added at an amount of some tens of micromoles, and the Hg ion at an amount of only a few micromoles. The electrolytic current density was as low as 2-10mA/cm2. The anode-cathode voltage was 20-136Volts. During the experiment the cell temperature ranged between 20 and 60°C. The Pd-Ag tube surface was previously mechanically cleaned (by fine, silica based, sandy soap), acetone rinsed, washed several times with distilled water, and finally treated at a temperature of about 450°C for a complete degassing. Before the cathodic H loading operations, the surface was “activated” by proper cycles of anodic oxidation. Vacuum was made inside the tube cavity, connecting pipes, pressure gauges and valves. We reached a maximum value of pressure inside the hollow cathode of about 8.5atm (absolute 9.5). The maximum value of 8.5atm was imposed by the mechanical strength limit of the 50μm wall of the tube. We would like to note that the faradic efficiency, i.e. the amount of hydrogen gas produced by the electrolytic current (collected and pressurised inside the tube) reached values as large as 15--20%; the efficiency strongly depends on the Pd surface conditions, type of electrolyte, current density, and temperature. In comparison, the device invented by Arata (using usual D2O - LiOH 0.1M electrolyte, tube 2.5mm thick) had efficiency on the order of 0.5--2.5%. Arata was able to reach pressures as high as several hundred atmospheres; up to now, we can’t say anything regarding the capability of our electrolyte in obtaining such a high pressures. In a further set of experiments we are going to use a thicker (0.250mm) ultra-pure (99.99%) Pd tube, specially developed for this purpose by ORIM SpA Company (Italy). In conclusion: 2 The effectiveness of the original device developed by Yoshiaki Arata since 1955 was fully confirmed; 3 The surprisingly high Faradic yield for H-D loading in hydro-alcoholic electrolyte might open some ways toward practical applications; 4 The measurement of H2 pressure in the hollow cathode directly confirms our previous results (H/Pd-D/Pd close to one, measured by the change in resistivity of the Pd cathode, and high faradic efficiency), obtained by electrochemical loading of long (typically 60cm) and thin (diameter 50μm) Pd wires in C2H5OH-H2O or C2H5OD-D2O electrolytes. Following the positive results of our experiment we received the acknowledgement of a large part of the Italian scientific community formerly sceptical about all that concerns Cold Fusion. Moreover, one of the most diffuse and influential (in Italy) INTERNET blog about environment & clean energy (http://www.vglobale.it) has adopted, as front page for 3 months, the photo of the experimental apparatus build at INFN-LNF. The number of down-loads of such photo (and 2 pages of explanations/comments) was quite large (increases of over 500 access/day of the blog, up to now). Such blog is certified by “spazio RP” and was established about 9 years ago. |
| 4992 | 2006-07-10 | Measurements of the Temperature Coefficient of electric Resistivity of hydrogen Overloaded Pd | 2006 | LNF-06-18(P).pdf | Antonio Spallone, Francesco Celani, Paolo Marini, Vittorio di Stefano | As reported in previous papers, we performed many electrolytic loading tests using thin Pd wires, achieving loading ratios of H/Pd ≥ 0.95 (H/Pd over-loading). In particular, we defined a reproducible “loading protocol” suitable for achieving such an over-loading level, based on the use of very diluted acid electrolytic solutions (with additions of tenths of micro-moles of Ca or Sr or Li cations and some hundred nano-moles of Hg ions) and operating with electrolytic current cycles from a few mA up to one hundred mA. By observing the day/night cyclic fluctuations of electrical resistance, as a function of the corresponding temperature variations, of stable, long term, H/Pd loadings we were able to calculate the temperature coefficient of resistivity (Kθ) of the Pd-H system at very high H/Pd loadings. Many years ago (on 1998) we reported an unexpected value showing that the Kθ parameter values increase when H/Pd exceeds 0.75 (i.e. after that R/Ro goes beyond the 1.8 peak value, i.e. to the right side of the R/Ro / H/Pd curve). This fact was confirmed by the ISR-Stanford Group (McKubre and Tripodi) and Pirelli-Research Group (Gamberale and Garbelli). In this paper we show several measurements of Kθ at different overloading values of H / Pd up to ≅ 1 (corresponding at R/Ro=1.12) where Kθ =(13±1) ⋅ 10-3 K-1 , i.e. more than six times higher than the minimum value achieved at the R/Ro=1.8 peak value. This result can corroborate the hypothesis that a new Pd-H phase (full β-phase or the beginning of β+γ phase) could occur after the H/Pd=0.75 loading ratio (at the end of α+β phase), as claimed by many authors as the necessary condition for excess (anomalous) heat from Pd-D system (at D/Pd ≥ 1). |
| 4993 | 2006-07-10 | The Italy-Japan Project-Fundamental Research on Cold Transmutation Process for Treatment of Nuclear Wastes | 2006 | LNF-06-19(P).pdf | Akito Takahashi, Francesco Celani, Yasuhiro Iwamura | The IJ Project proposes, as the first phase research, that confirmation of the cold transmutation using radioactive isotopes as Cs-137, Sr-90 and Cs-135 to non-radioactive elements will be implemented based on the MHI method. A theoretical background has been given by the TSC-induced nuclear reactions3). Charge-neutral pseudo-particle of 4d/TSC can become as small as 10 fm radius in its minimum state of squeezing motion and will make 4D-capture reaction with host metal (or added metal) nuclei in the surface region of permeation1,2) samples. Major reaction will be: M(A,Z) + 4d/TSC → M(A+8, Z+4) + Q Theoretical modeling of the process is briefly explained and resulting reaction products, their decays and final stable isotopes are predicted for Cs-137, Sr-90 and Cs-135 transmutations. |
| 4991 | 2006-07-07 | New Procedures to Make Active, Fractal Like, Surfaces on Thin PD Wires | 2006 | LNF-06-17(P).pdf | Francesco Celani, A. Spallone, E. Righi, G. Trenta, G. D’Agostaro, P. Quercia, V. Andreassi, O. Giacinti, P. Marini, V. DI Stefano, M. Nakamura, F. Todarello, E. Purchi, A. Mancini, P. G. Sona, F. Fontana, L. Gamberale, D. Garbelli, E. Celia, F. Falcioni, M. Marchesini, E. Novaro, U. Mastromatteo | In the framework of anomalous effects coming out because very close interaction of some specific gas (usually Deuterium-D, some times Hydrogen-H) with some specific solid materials (usually Palladium-Pd, some times Nickel or others) is an emerging evidence that the physical condition at the surface of the host element play a crucial role. It has been experimentally demonstrated, by Yoshiaki Arata at Osaka University, that nano-particles of Pd, embedded in a matrix of Zr02, are able to absorb extremely large amounts of H and/or D, at even room temperature and pressure. Because of such results, we re-analyzed some of our previous experiments under the new point of view and were convinced that most of our “positive” results in Condensed Matter Nuclear Science come because of lucky, specific condition of our Pd cathode. We decided to improve the quality of Pd, from the point of view of production of nanostructure at its surface as large (and stable) as possible, in a controllable way, using both electrolytic procedure and special preparation of Pd before the use. Some of our efforts seemed to give positive results, although the stability at long time as to be improved. |
| 4990 | 2006-06-30 | Starting Generators for ABS Intensity Calculations and Magnet System Design | 2006 | INFN-TC-06-11.pdf | Michelle Stancari | In his recent thesis, Alexander Nass\\cite{Nass:thesis} used the direct simulation monte carlo (DSMC) method to simulate the supersonic expansion of the hydrogen beam of an atomic beam source (ABS), finding good agreement with measured data for both atomic and molecular beams. Because the properties of such expansion cannot be calculated analytically, the potential applications of such simulations are numerous. In particular, when designing the sextupole magnets that both polarize and focus the ABS beam, one needs to know how the speed, direction, and position of the beams' atoms are distributed While the original simulations of Nass provided only the average value of these distributions, a recent extension of the simulation provides the speed, position and direction of every atom simulated. This additional information can be used to test the crude models of the beam previously employed to calculate magnet transmissions. In addition, it is demonstrated that the speed distribution of the atoms predicted by DSMC is very sensitive to the numerical value for the cross section used to simulate collisions. |
| 4987 | 2006-06-20 | Q^2 Dependence of Azimuthal Asymmetries in Semi-Inclusive Deep Inelastic Scattering | 2006 | INFN-AE-06-2.pdf | Elvio Di Salvo | We study several azimuthal asymmetries in semi-inclusive deep inelastic scattering and in Drell-Yan, interpreting them in the framework of the formalism of the quark correlator, with a particular reference to T-odd functions. The correlator contains an undetermined energy scale, which we fix on the basis of a simple and rather general argument. We find a different value than the one assumed in previous treatments of T-odd functions. This implies different predictions on the $Q^2$ dependence of the above mentioned asymmetries. Our result about the azimuthal asymmetry of unpolarized Drell-Yan agrees with presently available data, contrary to the alternative assumption on the scale. Predictions on other azimuthal asymmetries could be tested against data of planned experiments on Drell-Yan and semi-inclusive deep inelastic scattering. |
| 4984 | 2006-05-23 | Il Sistema di Controllo di un Bruciatore per L’analisi ed il Monitoraggio del Rischio Ambientale | 2006 | INFN-TC-06-10.pdf | A. Anastasio | Questa nota descrive il sistema di controllo della temperatura di un bruciatore sviluppato all’interno di un apparato basato su uno spettrometro a tempo di volo adoperato per effettuare l’analisi del rischio ambientale. Il modulo è basato su un microcontrollore PIC16F877 che ha 5 canali analogici d’ingresso ed un convertitore analogico digitale a 10 bit. |
| 4985 | 2006-05-23 | Omega-Like Fiber Bragg Grating Sensors as Position Monitoring Device: A Possible Pixel Position Detector in CMS? | 2006 | LNF-06-13(NT).pdf | S. Bianco, M.A.Caponero, F.L. Fabbri, A.Paolozzi | We make the exercise of considering the possible use of FBG sensors as a position device for the pixel detector of experiment CMS at LHC (CERN). We discuss the main features of FBG sensors, describe their use in HEP which we pionereed with the FINUDA experiment at DAFNE and developed for the BTeV experiment R& D at Frascati. We show results including long term stability, resolution, radiation hardness and characterization of Fiber Grating Sensors used to monitor structure deformation, repositioning and surveying of silicon detector in High Energy Physics. We discuss alignment issues in CMS silicon trackers and we evaluate a possible use of FBG sensors in the experiment. |
| 4983 | 2006-05-23 | A Case Study FOR Educational Collaborations between High Schools in Cosmic Ray Physic | 2006 | INFN-TC-06-9.pdf | A.Badalà, F. Blanco, F.Fichera, P. La Rocca, E.Leonora, F.Librizzi, G.S.Pappalardo, O.Parasole, A.Pulvirenti and F. Riggi | Educational experiments in cosmic ray physics, carried out with small size Geiger counters, suffer of limited statistics. High schools however may share their equipment to use such counters in parallel to increase the statistics and allow for educational measurements of the cosmic ray flux in a reduced time. As a test, a measurement of the barometric coefficient for cosmic rays was carried out by the use of six counters and a specially designed fan-in circuitry. |
| 4981 | 2006-05-15 | Analisi Gas-Cromatografiche Effettuate Presso la Sezione di Napoli, sulla Miscela Impiegata negli RPC di ATLAS | 2006 | INFN-TC-06-8.pdf | Riccardo de Asmundis | Presso la Sezione INFN di Napoli sono in svolgimento, mediante l’impiego di tecniche Gas-Cromatografiche (GC), analisi di contaminazione della miscela di gas utilizzata nei rivelatori RPC destinati all’esperimento ATLAS. Questa attività, in atto da circa un triennio, ha l’intento di proseguire sulla scorta dell’esperienza fatta presso la GIF-X5 del CERN, ove un gruppo di RPC finali di ATLAS è stato sottoposto a forte irraggiamento gamma con sorgente di 137Cs per un lungo periodo (2002-2005) [ ]. Le condizioni di lavoro sono ben differenti, in quanto la Sezione non dispone di alcun irraggiamento artificiale, per questo è stata utilizzata la fonte naturale di radiazione costituita dai raggi cosmici. L’attività ha come obiettivi, da una parte, il controllo della qualità della miscela gassosa impiegata durante le fasi di test ai raggi cosmici dei rivelatori RPC, dall’altra lo studio degli effetti che il volume sensibile del rivelatore può avere sul gas. |
| 4979 | 2006-05-05 | Overview of the Electrical Characterization of the AMS/CMS Silicon Microstrip Detectors | 2006 | INFN-AE-06-1.pdf | Nicoleta Dinu, Emanuele Fiandrini, Livio Fanò | This paper presents an overview of the electrical parameters commonly measured for the electrical certification of silicon micro-strip sensors. Mainly, parameters which contribute to the noise at the input of the read-out electronics will be described: the single-strip leakage current, the biasing resistance (the poly-silicon resistance for poly-silicon biasing and the bias-ring to strip resistance for punch-through biasing), the dielectric current and the coupling capacitance (for AC-coupling). Global parameters like total capacitance and total leakage current will be also presented. The general characteristics of the hardware system and a description of the electrical set-up configurations recommended for an accurate measurement of the electrical parameters will be also illustrated. |
| 4978 | 2006-04-03 | Prospects for $e^+e^-$ physics at Frascati between the $\\phi$ and the $\\psi$ | 2006 | LNF-06-11(IR).pdf | F. Ambrosino, F. Anulli, D. Babusci, S. Bianco, C.Bini, N.Brambilla, R.De Sangro, P.Gauzzi, P.M. Gensini, S. Giovannella, V. Muccifora, M. Negrini, F. Nguyen, S. Pacetti, G.Pancheri, M. Passera, A. Passeri, A.D.Polosa, M.Radici, Y.N. Srivastava, A.Vairo, G.Venanzoni, G.Violini | We present a detailed study, done in the framework of the INFN 2006 Roadmap, of the prospects for $e^+e^-$ physics at the Frascati National Laboratories. The physics case for an $e^+e^-$ collider running at high luminosity at the $\\phi$ resonance energy and also reaching a maximum center of mass energy of 2.5 GeV is discussed, together with the specific aspects of a very high luminosity $\\tau$-charm factory. Subjects connected to Kaon decay physics are not discussed here, being part of another INFN Roadmap working group. The significance of the project and the impact on INFN are also discussed. |
| 4977 | 2006-03-16 | 2005 Annual Report | 2006 | LNF-06-10(IR).pdf | AA VV | |
| 4976 | 2006-03-14 | Simulations and Measurements about the Electromagnetic Properties for the Cylyndrical Cavity of the Serse Ion Source | 2006 | INFN-TC-06-7.pdf | F. Maimone, D. Mascali, F. Consoli, S. Barbarino, L. Celona, G. Ciavola, S. Gammino | The electron heating process in an ECR ion source is affected by the electromagnetic properties of the plasma chamber and by the coupling properties of microwave generators with the chamber itself. Hence, the theoretical and experimental study of these properties is very important in order to improve the transfer of the electromagnetic waves energy to the plasma electrons. In this report an analytical and numerical characterization of the SERSE plasma chamber resonant modes is presented along with an experimental and numerical characterization of the microwave coupling. |
| 4974 | 2006-03-01 | CONStanza: Data Replication with Relaxed Consistency | 2006 | INFN-TC-06-6.pdf | Andrea Domenici, Flavia Donno, Gianni Pucciani, Heinz Stockinger | Data replication is an important aspects in a Data Grid for increasing fault tolerance and availability. Many Grid replication tools or middleware systems deal with read-only files which implies that replicated data items are always consistent. However, there are several applications that do require updates to existing data and the respective replicas. In this article we present a replica consistency service that allows for replica updates in a single-master scenario with lazy update synchronisation. The system allows for updates of (heterogeneous) relational databases, and it is designed to support flat files as well. It keeps remote replicas synchronised and partially ('lazily'') consistent. We report on the design and implementation of a novel ``relaxed'' replica consistency service and show its usefulness in a typical application use case. |
| 4975 | 2006-03-01 | Modification of Radiation by Relativistic Particles in Thin Target Due to Transition Radiation | 2006 | LNF-06-9(P).pdf | N. Nasonov, V.A. Likhaekev, S.B. Dabagov | Influence of transition radiation by relativistic electrons crossing a thin target on other emission processes involved in electron-target interaction is considered. Strong modification of the characteristics of such emission mechanisms as bremsstrahlung and polarization bremsstrahlung as well as parametric X-ray radiation in crystalline targets is discussed in this work. |
| 4973 | 2006-02-28 | SFERA - Proposal for a Sperical Gravitational Wave Detector | 2006 | LNF-06-8(IR).pdf | INFN - (Frascati Genova L'Aquila Roma Roma2) University of Genova University of Lieden | |
| 4972 | 2006-02-24 | Detection of Pulsed Synchrotron Radiation Emission with Uncooled Infrared Detectors | 2006 | LNF-06-7(P).pdf | Alessio Bocci, Massimo Piccinini, Alessandro Drag, Mariangela Cestelli, Diego Sali, Pierangelo Morini, Emanuele Pace, Jozef Piotrowski, Augusto Marcelli | The synchrotron light emission is a non-thermal radiation source covering a large energy domain from IR to X-ray energies, with a time structure determined by the length and shape of the stored bunches. With suitable infrared detectors, the pulsed emission can be used to perform spectroscopic experiments at high time and spatial resolution. However, fast infrared detectors can be also applied to investigate the physical structure of the stored particles. We present here the first characterization of the synchrotron light emission at DAΦNE using detectors optimized in the mid-IR domain with a sub-ns time resolution. Experiments have been performed using the infrared SINBAD beamline, characterizing the emission of the 105 bunches stored in the electron ring of this e+-e- collider. With both uncooled photoconductive and photovoltaic infrared detectors optimized to work at a wavelength of 10.6 μm we resolved the infrared temporal emission of the electron bunches structure at DAΦNE characterized by bunches separated of 2.7 ns with a rise time of 176 ps and a fall time of 660 ps. |
| 4969 | 2006-02-20 | Tests with GPS Camac Units for Educational Experiments on Cosmic Ray Physics | 2006 | INFN-TC-06-4.pdf | A. Badalà, F. Blanco, P. La Rocca, F. Librizzi, G.S.Pappalardo, A.Pulvirenti and F. Riggi | Educational and professional experiments in cosmic ray physics usually require the use of GPS units for a precision time-stamp of the collected events, in order to correlate events measured with independent detectors. As a part of an educational program aimed to carry out experiments in collaboration with high school teams, several tests of a time-stamp system based on the use of CAMAC GPS units was performed. Position and time information for periodic as well as for random events were collected, to check the reliability of the method and the achievable resolution, in view of on-going experiments with extended arrays of cosmic ray detectors. |
| 4970 | 2006-02-20 | Galactic Basins of Helium and Iron around the Knee Energy | 2006 | INFN-TC-06-5.pdf | Antonio Codino, François Plouin | The differential energy spectrum of cosmic rays exhibits a change of slope, called $knee$ of the spectrum, around the nominal energy of $3 \\times 10^{15}$ $eV$, and individual $knees$ for single ions, at different energies. The present work reports a detailed account of the characteristics and the origin of the knees for Helium and Iron. Current observational data regarding the magnetic field, the insterstellar matter density, the size of the Galaxy and the galactic wind, are incorporated in appropriate algorithms which allow to simulate millions of cosmic-ion trajectories in the disk. Bundles of ion trajectories define galactic regions called basins utilized in the present analysis of the knees. The fundamental role of the nuclear cross sections in the origin of the helium and iron knees is demonstrated and highlighted. \\par The results of the calculation are compared with the experimental data in the energy interval $ 10^{12}$ $eV$ - $ 5 \\times 10^{17}$ $eV$. There is a fair agreement between the computed and measured energy spectra of Helium and Iron; rather surprisingly their relative intensities are also in accord with those computed here. The results suggest that acceleration mechanisms in the disk are extraneous to the origin of the $knees$. |
| 4971 | 2006-02-20 | Applicazioni Tecnologiche della Camera Spaziale Climatica dei Laboratori Nazionali di Frascati | 2006 | LNF-06-6(IR).pdf | G. Bellettini, A. Bosco, C. Cantone, I. Ciufolini, D. Currie, S. Dell’Agnello, G. Delle Monache, M. A. Franceschi, M. Garattini, T. Napolitano, A. Paolozzi, E. C. Pavlis, D. P. Rubincam, V. J. Slabinski, R. Tauraso | La Camera Spaziale Climatica (CSC) in allestimento ai LNF è un progetto integrato con applicazioni di fisica fondamentale e di ricaduta e trasferimento tecnologico per usi civili ed industriali . Nella CSC, infatti, si intendono studiare sperimentalmente le caratteristiche ottiche e termiche delle componenti dei satelliti LAGEOS I e II (già operativi) e la loro evoluzione LARES (in via di realizzazione ai LNF). Lo scopo è quello di migliorare l’accuratezza della misura del trascinamento dei sistemi inerziali in Relatività Generale (effetto Lense-Thirring [1] [2]) e delle applicazioni di Geodesia. Gli elementi orbitali vengono determinati con inseguimento via laser da Terra dei satelliti (Satellite Laser Ranging, SLR). L’applicazione tecnologica piu’ importante è il contributo fondamentale alla definizione del sistema internazionale di riferimento di posizione terrestre (ITRF, Intern. Terrestrial Reference Frame), emesso dallo IERS (Intern. Earth Reference Service), lo standard assoluto per tutte le attività civili, industriali e scientifiche, a Terra e nello spazio, che necessitano di un sistema di riferimento assoluto. Le misure effettuate nella CSC saranno, inoltre, estremamente utili all’ottimizzazione dell’integrazione tra il GNSS (Global Navigation Satellite System) [6] ed SLR, che avrà compimento sulle costellazioni di GALILEO (Europa) e GPS-3 (USA). |
| 4968 | 2006-02-17 | Software per il Monitoring dei Parametri Oracle | 2006 | LNF-06-5(NT).pdf | Claudio Bisegni | Questo documento illustra il funzionamento del programma di monitoring per i database Oracle (8i, 9i, 10g) CheckDatabase. Il tool è indicato a chi deve monitorare, nel tempo, l’andamento dei parametri scelti in modo da avere un’indicazione sui fattori che impattano le performance del Database |
| 4967 | 2006-02-09 | Statistical Model of Sphalerite Structured Quaternary A1xBxYyZ1-y Systems | 2006 | LNF-06-4(P).pdf | B.V. Robouch, A. Kisiel, A. Marcelli, M. Cestelli Guidi, M. Piccinini, E. Burattini, A. Mycielski | Tetrahedron coordinated sphalerite quaternary systems of type A1-¬xBxYyZ1-y consist exclusively of binary and ternary elemental tetrahedra, four of the first and four of the latter, each one with three configurations, i.e., a total of sixteen elemental tetrahedron configurations. These configurations cannot contain all four constituent atoms simultaneously in the same elemental tetrahedron; as a consequence we can consider each ternary tetrahedron composition as diluted in the quaternary compound. Thus, A1xBxYyZ1-y extended x-ray absorption fine structure (EXAFS) data can be treated by using the strained tetrahedron model which, originally developed to deal with ternary systems, has already exhibited excellent agreement with numerous experimental data. To determine ion site occupation preferences of quaternary systems, we applied this model to our EXAFS data for Cd1-xMnxSeyTe1-y and to GaxIn1-xAsySb1-y data available in the literature, and compared them to those derived from ternary data for Cd1-xMnxTe and GaxIn1-xAs. In both sets, as the ternary is diluted in the quaternary system, a drift of the preference values of the pure ternary is observed. The present analysis of experimental reflectivity far infrared (FIR) phonon spectra of quaternary Cd1¬xMnxSeyTe1-y crystals confirms the model predictions and leads to an interpretation of the experimental data for A1-xBxYyZ1-y quaternary systems |
| 4952 | 2006-01-27 | Measurement of the Trips Source Plasma Parameters by Means of a Langmuir Probe | 2006 | INFN-TC-06-3.pdf | D. Mascali, G. Ciavola, S. Gammino, L. Celona, F. Consoli, S. Passarello, S. Barbarino, F. Maimone | The intense proton source TRIPS, designed for the TRASCO project and now under installation at the Laboratori Nazionali di Legnaro, has been operational for 4 years at INFN-LNS and now all the macroscopic parameters are well defined, as for beam current, beam emittance, neutralization factor and reliability. No information has been available up to now about the plasma parameters for such a type of microwave discharge ion source, except for theoretical estimations. This report will describe the measurements of electron and ion density, temperature, plasma potential for typical operational conditions, along with the description of the experimental set-up used for the measurements, based on a Langmuir Probe |
| 4949 | 2006-01-20 | MATPRO: a Computer Library of Material Property at Cryogenic Temperature | 2006 | INFN-TC-06-2.pdf | Lucio Rossi, Massimo Sorbi | For computing of quench propagation in superconducting magnets, a number of material properties from cryogenic to room temperature are necessary. This paper presents the main features (and limitations) of a computer library that provides thermal and electric properties of most used materials in superconducting magnets. Although not complete, the library might be useful to be integrated into suitable custom numerical codes. The library, written in Fortran language, can work also as stand alone and can be interrogated in order to give in output both the required property or tables easy to be plotted. |
| 4950 | 2006-01-20 | Tracking in Antiproton Annihilation Experiments | 2006 | LNF-06-3(P).pdf | Olaf N. Hartmann | A major ingredient of the planned new accelerator complex FAIR, to be constructed at the GSI, Darmstadt, Germany, is the availability of antiproton beams with high quality and intensity. Among the experiments which will make use of this opportunity is PANDA, a dedicated experiment to study antiproton annihilations on nucleons and nuclei. This article gives an overview on the foreseen techniques to perform charged particle tracking in the high rate environment of this experiment. |
| 4948 | 2006-01-19 | Particolato Atmosferico A Modena Nell’estate 2004 Risultati dell’Analisi Elementale e Statistica | 2006 | INFN-TC-06-1.pdf | Alessandra d'Alessandro, Franco Marenco, Federico Mazzei, Silvia Nava, Paolo Prati, Roberta Vecchi | Nell’estate del 2004, 69 campioni di particolato atmosferico raccolti a Modena dall’Agenzia Regionale Prevenzione e Ambiente dell’Emilia-Romagna sono stati sottopostiad analisi elementale, per mezzo di fluorescenza a raggi X. Le concentrazioni riscontrate degli elementi sono successivamente state sottoposte ad analisi statistica multivariata, al fine dievidenziarne le correlazionie metterne in luce le sorgenti. Quattro sorgentisono state individuate, permettendo di quantificare la componente naturale (11 µg/m3) e quella antropica (20 µg/m3) del particolato nella città durante il periodo diosservazione. |
| 4947 | 2006-01-15 | VPN at LNF – User Guide | 2006 | LNF-06-2(NT).pdf | Angelo Veloce | La presente nota tecnica rappresenta una guida per l’utente affinche’ possa connettersi alla Local Area Network (LAN) dei Laboratori Nazionali di Frascati utilizzando un CISCO VPN Concentrator 3030. L’obiettivo e’ quello di permettere ad utenti “mobili” di accedere in modo “trasparente” alle risorse della propria LAN superando access-list o firewall presenti sul Router di frontiera ad Internet. Le modalità di accesso implementate sono due: attraverso l’uso di IPSec ed attraverso SSL, soluzione denominata WebVPN. |
| 4946 | 2006-01-13 | Enabling Pulse Compression and Proton Acceleration in a Modular ICF Driver for Nuclear and Particle Physics Applications | 2006 | LNF-06-1(P).pdf | F. Terranova, S.V. Bulanov, J.L. Collier, H. Kiriyama, F. Pegoraro | The existence of efficient ion acceleration regimes in collective laser-plasma interactions opens up the possibility to develop high-energy physics facilities in conjunction with projects for inertial confinement nuclear fusion (ICF) and neutron spallation sources. In this paper, we show that the pulse compression requests to make operative these acceleration mechanisms do not fall in contradiction with current technologies for high repetition rate ICF drivers. In particular, we discuss explicitly a solution that exploits optical parametric chirped pulse amplification and the intrinsic modularity of the lasers aimed at ICF. |
| 4951 | 2005-12-23 | Future Research Activities at LNF | 2005 | LNF-05-33(IR).pdf | Editorial Board: M. Benfatto, M.E. Biagini, C. Bloise, A. Fantoni, G. Isidori, E. Pace, F. Terranova} | |
| 4939 | 2005-12-22 | Using GNU Autotools for the GDMP Package | 2005 | INFN-TC-05-15.pdf | Flavia Donno, Maria Santa Mennea | In this document we give a short introduction to the GNU Autotools functionality and we explain their use to manage the GDMP package, pointing out the problems encountered and outlining, where necessary, the need to review the structure of the package. |
| 4940 | 2005-12-22 | Storage Management in the GRID | 2005 | INFN-TC-05-16.pdf | Flavia Donno, Gigliola Vaglini | An application running on a Grid infrastructure needs to be able to transparently access distributed data available at some storage centers. The Grid middleware and infrastructure are responsible to reserve the necessary space, enforce local authorization policies, privacy and security, allow for transparent access to the underlying local storage system, etc. The goal and main contribution of this paper is to give an overview of the state of the art of storage management technologies in the Grid. Clear overviews are important in order to better drive the research evolution and for general guidance. We present a summary of hardware and software storage solutions adopted in various research centers part of the LHC Computing Grid infrastructure and the open problems to establish standards for “file sharing” and a “master namespace server”. Then we analyze the requirements for a Grid application, we present the Grid solutions proposed and the prototypes currently under test |
| 4937 | 2005-12-22 | Spectroscopy of D Mesons | 2005 | LNF-05-28(P).pdf | S. Bianco | The scenario of heavy quark meson spectroscopy underwent recently a major revolution, after the observation of BABAR and CLEO, confirmed by BELLE, of $\\DsJ$ L=1 excited states, and by further evidences by SELEX. These experimental results have cast doubts on the incarnations of the ideas of Heavy Quark Effective Theory in heavy quark spectroscopy. I shall review the status of experimental data, discuss implications and sketch an outlook. |
| 4938 | 2005-12-22 | Nuclear and Hadron Physics with Antiprotons: PANDA@FAIR | 2005 | LNF-05-29(P).pdf | Olaf N. Hartmann | The future Facility for Antiproton and Ion Research (FAIR) at the GSI Darmstadt, Germany, comprises an experimental program with high quality and high intensity antiproton beams in the momentum range from 1.5 to 15 GeV/c. PANDA (Antiproton Annihilation at Darmstadt) is a dedicated experiment to study antiproton annihilations on protons and nuclei. This article gives an overview on the experimental facility, the physics program with special emphasis on the nuclear physics topics, and the status of the detector design. |
| 4941 | 2005-12-22 | Micrometric Position Monitoring Using Fiber Bragg Gratin Sensors in Silicon Detectors | 2005 | LNF-05-30(P).pdf | E.Basile, F.Bellucci, L. Benussi, M. Bertani, S. Bianco, M.A. Caponero, D. Colonna, F. Di Falco, F.L. Fabbri, F. Felli, M.Giardoni, A. La Monaca, F.Massa, G. Mensitieri, B. Ortenzi, M. Pallotta, A. Paolozzi, L. Passamonti, D. Pierluigi, C. Pucci, A. Russo, G. Saviano | We show R\\&D results including long term stability,resolution, radiation hardness and characterization of Fiber Grating sensors used to monitor structure deformation, repositioning and surveying of silicon detector in High Energy Physics. |
| 4942 | 2005-12-22 | Two-And Three-Dimensional Reconstruction and Analysis of the Straw Tubes Tomography in the BTeV Experiment | 2005 | LNF-05-31(P).pdf | E.Basile, F.Bellucci, L. Benussi, M. Bertani, S. Bianco, M.A. Caponero, D. Colonna, F. Di Falco, F.L. Fabbri, F. Felli, M. Giardoni, A. La Monaca, F.Massa, G. Mensitieri, B. Ortenzi, M. Pallotta, A. Paolozzi, L. Passamonti, D.Pierluigi, C. Pucci, A. Russo, G. Saviano | A check of the eccentricity of the aluminised kapton straw tubes used in the BTeV experiment is accomplished using X-ray tomography of the section of tubes modules. 2 and 3-dimensional images of the single tubes and of the modules are reconstructed and analysed. Preliminary results show that a precision better than 40 $\\mu$m can be reached on the measurement of the straw radii. |
| 4943 | 2005-12-22 | A Novel Approach for an Integrated Straw Tube-Microstrip Detector | 2005 | LNF-05-32(P).pdf | E.Basile, F.Bellucci, L.Benussi, M. Bertani, S. Bianco, M.A. Caponero, D. Colonna, F. Di Falco, F.L. Fabbri, F. Felli, M.Giardoni, A. La Monaca, G. Mensitieri, B. Ortenzi, M. Pallotta, A. Paolozzi, L.Passamonti, D.Pierluigi, C. Pucci, A. Russo, G. Saviano, F. Massa, F.Casali, M.Bettuzzi, D.Biancon, F. Baruffaldi, E. Petrilli | We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell $^{ \\circledR}$ lattice and carbon fiber reinforced plastic shell. Results on mechanical and test beam performances are reported on as well. |
| 4935 | 2005-12-20 | Papers presented at PAC 2005 | 2005 | LNF-05-26(P).pdf | Accelerators Division | |
| 4936 | 2005-12-20 | Calibration of the Resonant Gravitational Wave Detectors Explorer and Nautilus in 2003 and 2004 Using Cosmic Rays | 2005 | LNF-05-27(IR).pdf | G. Modestino, G.Pizzella, F.Ronga -- for the ROG Collaboration | The cryogenic resonant gravitational wave detectors EXPLORER and NAUTILUS are able to detect cosmic ray showers. The experimental result leads to classify the responses in two categories: many small signals, in most cases with small multiplicity, obeying the thermo-acoustic model, and few large signals, usually associated to large multiplicity, which exceed the thermo-acoustic model by orders of magnitude, and whose understanding is still under investigation. Using the low multiplicity showers, we make a relative calibration of the apparatuses, comparing the response of EXPLORER with that of NAUTILUS. This comparison turns out useful when searching for coincidences between gravitational waves detectors. |
| 4934 | 2005-12-20 | SuperB: a Linear High-Luminosity B Factory | 2005 | INFN-AE-05-8.pdf | J. Albert, G. P.Dubois-Felsmann, D. G. Hitlin, F. C. Porter, G. Bonneaud, S. Playfer, M. Biagini, P. Raimondi, A. Stocchi, France , S. Bettarini, G. Calderini, F. Forti, M. A. Giorgi, A. Lusiani, N. Neri, Superiore and INFN, I-56127 Pisa, Italy , L. Silvestrini, INFN, I-00185 Roma, Italy , M. Ciuchini, Y. Cai, S. Ecklund, D. W. G. S. Leith, A. Novokhatski, B. N.Ratcliff, A. Roodman, J. Seeman, M. Sullivan, U. Wienands, W. J. Wisniewski, D. B. MacFarlane, F. Martinez-Vidal, T. J. Gershon, M. Pierini | This paper is based on the outcome of the activity that has taken place during the recent workshop on ``\\SuperB\\ in Italy'' held in Frascati on November 11-12, 2005. The workshop was opened by a theoretical introduction of Marco Ciuchini and was structured in two working groups. One focused on the machine and the other on the detector and experimental issues. The present status on \\CP\\ is mainly based on the results achieved by \\babar\\ and \\Belle. Estabilishment of the indirect \\CP\\ violation in \\B\\ sector in 2001 and of the direct CP violation in 2004 thanks to the success of \\pep2\\ and KEKB \\epem\\ asymmetric $B$ Factories operating at the center of mass energy corresponding to the mass of the \\FourS. With the two $B$ Factories taking data, the Unitarity Triangle is now beginning to be overconstrained by improving the measurements of the sides and now also of the angles $\\alpha$, and $\\gamma$. We are also in presence of the very intriguing results about the measurements of \\stwob\\ in the time dependent analysis of decay channels via penguin loops, where $\\b \\to \\s\\sbar\\s$ and $\\b \\to \\s\\dbar\\d$. \\mtau\\ physics, in particular LFV search, as well as charm and ISR physics are important parts of the scientific program of a \\SuperB Factory. The physics case together with possible scenarios for the high luminosity \\SuperB Factory based on the concepts of the Linear Collider and the related experimental issues are discussed. |
| 4932 | 2005-11-29 | Conceptual Design for a Polarized Proton-Antiproton Collider Facility at GSI | 2005 | INFN-TC-05-14.pdf | F. Bradamante, I. Koop, A. Otboev, V. Parkhomchuk, V. Reva, P. Shatunov, Yu. Shatunov | Two possible options of polarized proton-antiproton collider at the future HESR storage ring are considered. It is shown that the modifications of the present HESR project which are needed to arrange for the polarized proton-antiproton collisions are relatively moderate. An achievable luminosity of 5·1031 cm-2·sec-1 will provide a possibility to carry out experiments in the CM energy range 10-30 GeV, a particularly interesting option for Drell-Yan physics. |
| 4930 | 2005-11-25 | A Photon Tag Calibration Beam for the AGILE Satellite | 2005 | LNF-05-24(IR).pdf | S. Hasan, M. Prest, L. Foggetta, C. Pontoni, A. Mozzanica, G. Barbiellini, M. Basset, F. Liello, F. Longo, E. Vallazza, B. Buonomo, G. Mazzitelli, L. Quintieri, P. Valente, F. Boffelli, P. Cattaneo, F. Mauri | The AGILE satellite will be launched in 2006 for the study of gamma rays in the energy range 30~MeV-50~GeV. The satellite has to be calibrated using gamma rays of known energy. The calibration facility is being developed at the Beam Test Facility (BTF) at the INFN Laboratories in Frascati. The photons are produced by bremsstrahlung of electrons with a maximum momentum of 750~MeV/c. The electrons are tagged using a dipole magnet whose internal walls are covered by microstrip silicon detectors: depending on the energy loss, they impinge on a different strip once the dipole current has been set to a given value. The correlation between the direction of the electron measured by a pair of $x$-$y$ silicon chambers and the impinging position on the tagging module inside the magnet allows the tagging of the photon. The paper describes the calibration layout and tests and the results, compared with the Montecarlo simulation, in terms of production rate and energy resolution. |
| 4931 | 2005-11-25 | High Granularity Silicon Beam Monitors for Wide Range Multiplicity Beams | 2005 | LNF-05-25(IR).pdf | A. Mozzanica, F.~Risigo, A. Bulgheroni, M. Caccia, C. Cappellini, M. Prest, L. Foggetta, B. Buonomo, G. Mazzitelli, P. Valente, E. Vallazza | positron beams in the energy range tens of MeV-750~MeV in a wide range of intensity, from 1 up to 10$^{10}$ particles per pulse. The pulse rate is 50~Hz. This paper describes the implementation of two types of high granularity silicon beam monitors: two pairs of silicon strip detectors readout by single particle ASICs for the low multiplicity range (1-100 particles) and a silicon strip detector with charge integrating electronics to cover the remaining range (100-$10^{10}$). Both the silicon detectors are characterized by large dimensions (up to 9.5$\\times$9.5~cm$^{2}$) and a granularity in the 100~$\\mu$m range. The paper describes the two systems and the results obtained during several dedicated runs. |
| 4928 | 2005-11-14 | First Results on Vacuum Brazing of Rf 11 Ghz Accelerating Structure at Frascati Laboratories | 2005 | LNF-05-22(IR).pdf | P. Chimenti, V. Chimenti, A. Clozza, R. Di Raddo, V. Lollo, M. Migliorati, B. Spataro | The international scientific community of particle accelerators has an increasing interest in developing new and more performing accelerating structures. The X band linear accelerating cavities are very promising devices to obtain high accelerating gradients. The aim of this paper is to describe the mechanical and vacuum brazing procedures adopted to realize a 11.4 GHz RF linear accelerating structure. |
| 4929 | 2005-11-14 | An Investigation on Electroforming Procedures Kor R.F. 11 Ghz Linear Accelerating Structures at Frascati Laboratory | 2005 | LNF-05-23(IR).pdf | P. Chimenti, V. Chimenti, A. Clozza, R. Di Raddo, V. Lollo, M. Migliorati, B. Spataro | An activity on the design and construction of high frequency, multicell accelerating structures is in progress at Frascati Lab using the Vacuum Brazing Technique. An alternative to the standard machining and brazing procedure is the Galvanoplastic technique of Electroforming. A study on the possibility of obtaining the same final result following this completely different technique is in progress. |
| 4926 | 2005-11-09 | Neutron emission from D$_{2}$ gas in magnetic fields under low temperature | 2005 | LNF-05-20(P).pdf | Tadahiko Mizuno, Tadashi Akimoto, Akito Takahashi, and Francesco Celani | We observed neutron emissions from pure deuterium gas after it was cooled in liquid nitrogen and placed in a magnetic field. Neutron emissions were observed in ten out of ten test cases. Neutron burst of 5.5\\,counts/s were 1000 times higher than the background counts. These bursts occurred one or two times within a 300\\,s interval. The total neutron emission can be estimated from the counting efficiency, and it was \\mbox{10$^{4}$--10$^{5}$\\,counts/s.} The reaction appears to be highly reproducible, reliably generating high neutron emissions. We conclude that the models proposed heretofore based upon d--d reactions are inadequate to explain the present results, which must involve magnetic field nuclear reactions. |
| 4927 | 2005-11-09 | An Overview of Experimental Studies on H/P\\lowercase{d} Over-Loading with thin P\\lowercase{d} Wires and Different Electrolytic | 2005 | LNF-05-21(P).pdf | A. Spallone F. Celani V. Di Stefano P. Marini | Hundreds of electrolytic loading tests of thin Pd wires in different experimental conditions have been performed in order to find out the best procedures for stable, high hydrogen overloading into the palladium lattice. In a very dilute acid solution thin Pd cathodes (50 or 100\\,$\\mu $m in diameter) and thick Pt anodes (0.5\\,mm in dia{-}\\break meter) were used in a parallel or coaxial geometry. Normalised resistance ($R/R_{0}$) of the Pd cathode was on-line and continuously measured in order to determine the actual H/Pd values. Different electrolytic solutions have been tested by adding to the acid solution very low amounts of Ca, Sr, Li, and Hg ions; high loading H/Pd ratios have been achieved with a satisfactory grade of reproducibility. Several loading procedures have been performed in a wide range of electrolysis current (from a few mA up to 100\\,mA) and at different Hg ion concentrations. The obtained results allowed for the definition of a loading protocol that ensures very high H/Pd over-loading. Stable $R/R_{0} \\le 1.2$ values (corresponding to H/Pd ratios $\\ge $ 1) can be currently achieved with an extremely low power electrolytic supply (10\\,V, 5\\,mA) |
| 4924 | 2005-11-03 | X-ray Propagation Through Hollow Channel: PolyCAD - A Ray Tracing Code | 2005 | LNF-05-19(P).pdf | Dariush Hampai, Sultan B. Dabagov, Giorgio Cappuccioand Giannantonio Cibin | ``PolyCAD'', a CAD program designed for X-ray photon tracing in polycapillary optics, is described. To understand the PolyCAD code and its results, the theoretical bases of X-ray transmission by a single cylindrical channel (monocapillary) are discussed first. Then cases of cylindrical, lens and semi-lens shaped polycapillary optics are examined. PolyCAD allows any type of X-ray source to be used: an X-ray tube of finite beam dimensions or an astrophysical object can be simulated in combination with the polycapillary optics. The radiation density distribution images formed on a screen located at various focal distances are discussed. The good agreement of the PolyCAD results with experimental and previous theoretical findings validate the code. |
| 4921 | 2005-10-26 | Request Tracker: un Software Open-Source per il Trouble Ticket Management | 2005 | INFN-TC-05-13.pdf | Francesca Del Corso, Riccardo Veraldi | RT rappresenta una soluzione valida per la gestione delle richieste di help desk da parte degli utenti e dei certificati rilasciati dell’INFN Certification Authority. Si tratta di un pacchetto open-source, flessibile, personalizzabile e di facile manutenzione. Di seguito vengono delineate le procedure per la sua installazione, configurazione e manutenzione, con una panoramica sull’uso del CLI per l’automazione e l’integrazione con tool esterni e di add-on aggiuntivi. Il seguente documento vuole essere una guida operativa per il LAN Manager che intende adottare questa soluzione, in produzione presso la Sezione INFN di Firenze da oltre due anni. |
| 4923 | 2005-10-26 | Measurements of the Temperature Coefficient of Electric Resistivity of Hydrogen Overloaded Pd | 2005 | LNF-05-18(IR).pdf | Antonio Spallone, Francesco Celani, Paolo Marini, Vittorio Di Stefano | DisponibileA s reported in previous papers, we performed many electrolytic loading tests using thin Pd wires, achieving loading ratios of H/Pd ≥ 0.95 (H/Pd over-loading). In particular, we defined a reproducible “loading protocol” suitable for achieving such an over-loading level, based on the use of very diluted acid electrolytic solutions (with additions of tenths of micro-moles of Ca or Sr or Li cations and some hundred nano-moles of Hg ions) and operating with electrolytic current cycles from a few mA up to one hundred mA. By observing the day/night cyclic fluctuations of electrical resistance, as a function of the corresponding temperature variations, of stable, long term, H/Pd loadings we were able to calculate the temperature coefficient of resistivity (Kθ) of the Pd-H system at very high H/Pd loadings. Many years ago (on 1998) we reported an unexpected value showing that the Kθ parameter values increase when H/Pd exceeds 0.75 (i.e. after that R/Ro goes beyond the 1.8 peak value, i.e. to the right side of the R/Ro / H/Pd curve). This fact was confirmed by the ISR-Stanford Group (McKubre and Tripodi) and Pirelli-Research Group (Gamberale and Garbelli). In this paper we show several measurements of Kθ at different overloading values of H / Pd up to ≅ 1 (corresponding at R/Ro=1.12) where Kθ =(13±1) ⋅ 10-3 K-1 , i.e. more than six times higher than the minimum value achieved at the R/Ro=1.8 peak value. This result can corroborate the hypothesis that a new Pd-H phase (full β-phase or the beginning of β+γ phase) could occur after the H/Pd=0.75 loading ratio (at the end of α+β phase), as claimed by many authors as the necessary condition for excess (anomalous) heat from Pd-D system (at D/Pd ≥ 1). |
| 4925 | 2005-10-10 | An Optical System Developed for Target Laser Pulse Generation | 2005 | INFN-BE-05-2.pdf | Simone Cialdi, Ilario Boscolo, Andrea Paleari | We present the optical system developed for laser pulse shaping investigations. The items of the system are: a mode-locked 5 W 100 MHz 90 ps Nd:YAG laser coupled to an optical fiber, a programmable pulse shaping system, an autocorrelator and a spectrometer. The system can be programmed to generate any target waveform compatible with the spectral bandwidth of the laser system. The generation of a 2 ps compressed pulse and of rectangular, double-pulse and multi-pulse profiles with fairly good stability is discussed. The system is built for tests of shaping systems arranged in different configurations. |
| 4920 | 2005-09-30 | A 32 Channels Charge Integrating ADC Based on Digital Signal Integration | 2005 | LNF-05-16(IR).pdf | A. Balla, M. Beretta, P. Branchini, P. Ciambrone, G. Corradi, E. De Lucia, P. de Simone, G. Felici, M. Gatta, V. Patera | A digital charge integrator with programmable gate width and range has been designed for use in the KLOE drift chamber front-end chain. The system has a resolution of $9$ bits ranging from $600$ $fC/count$ up to $\\approx 76$ $pC$ and integration time ranging from $100$ $ns$ to about $13$ $\\mu sec$. Thirty two channels have been packaged in a single VME 9U board. |
| 4918 | 2005-09-23 | Further Studies, About New Elements Production, by Electrolysis of Cathodic Pd Thin–Long Wires, in Alcohol-Water Solutions (H, D) and Th-Hg Salts. New Procedures to Produce Pd Nano-Structures | 2005 | LNF-05-14(P).pdf | Francesco Celani, A. Spallone, P. Marini, V. Di Stefano, M. Nakamura, E. Todarello, A. Mancini, P. G. Sona, E. Righi, G. Trenta, C. Catena, G. D’agostaro, P. Quercia, V. Andreassi, F. Fontana, L. Gamberale, D. Garbelli, E. Celia, F. Falcioni, M. Marchesini, E. Novaro, U. Mastromatteo | Abstract They were continued, at National Institute of Nuclear Physics, Frascati National Laboratories-Italy, the systematic studies about detection of new elements, some even with isotopic composition different from natural one, after prolonged electrolysis of Pd wires. The electrolytic solution adopted is the, unusual, used from our experimental group since 1999. In short, it was a mixture of both heavy ethyl alcohol (C2H5OD at 90-95%) and water (D2O, at 10-5%), with Th salts at micromolar concentration and Hg at even lower concentration (both of spectroscopic purity). The liquid solutions, before use, were carefully vacuum distilled (and on line 100nm filtered) at low temperatures (30-40°C) and analysed by ICP-MS. The pH was kept quite mild (acidic at about 3-4). The cathode is Pd (99.9% purity) in the shape of long (60cm) and thin wires (diameter only 0.05mm). Before use, it is carefully cleaned and oxidised by Joule heating in air following a (complex) procedure from us continuously improved (since 1995). Before and after use, some pieces of it, about 50% of total length, are ICP-MS analysed. The anode is a Pt wire (purity>99.99%), 0.250mm diameter. The cell adopted is usually a borosilicate chemical glass (like SCHOTT-DURAN, Germany), filling volume about 750cc. Recently (since July 2004) an ultra-pure quartz cylinder (volume about 1050cc) was adopted in order to rule out possibilities of corrosion effects from the cell. The sample older and details of cell are made only of PTFE, as detailed at ICCF10 and ICCF11. |
| 4919 | 2005-09-23 | Innovative Procedure for fhe, In Situ, Measurement of the Resistive Thermal Coefficient Of H(D)/Pd During Electrolysis; Cross-Comparison of New Elements Detected in The Th–Hg–Pd–D(H) Electrolytic Cells | 2005 | LNF-05-15(P).pdf | Francesco Celani, A. Spallone, E. Righi, G. Trenta, C. Catena, G. D’agostaro, P. Quercia, And V. Andreassi, P. Marini, V. Di Stefano, M. Nakamura, A. Mancini, P.G. Sona , F. Fontana, L. Gamberale, And D. Garbelli, E. Celia, F. Falcioni, M. Marchesini, And E. Novaro , U. Mastromatteo | In the framework of cold fusion studies one of the most important parameters is the deuterium (D) to palladium (Pd) ratio, D/Pd. It is well known that the value of this parameter is related to the normalised resistivity (R/R0) of the D–Pd system. When at high D/Pd ratios (i.e. at low R/R0 values) some excess heat occurs, the Pd wire temperature increase and, as a consequence, the apparent R/R0 value also increases. This effect might give raise to ambiguous data interpretation: similar results are in fact expected in case of a Pd wire degassing (i.e. decreasing of D/Pd ratio). To solve this problem, we developed an innovative procedure and a suitable experimental set-up for the in situ measurement of the Resistive Temperature Coefficient (which is affected only by the real D/Pd ratio) during electrolysis. We will report the results on the hydrogen and deuterium loading of thin (50 µm), and long (60 cm) Pd wires, immersed in a solution of C2H5OD (or C2H5OH) and D2O (or H2O), with addition of thorium (Th) and mercury (Hg) salts at micromolar concentra¬tions. Evidence of “transmutations” of some elements occasionally present on the Pd surface, and sometimes also in the electrolytic solution, have often been claimed in cold fusion experiments. In the present work, unexpected elements have been detected by high-resolution ICP-MS analysis. Some of these elements have also an isotopic composition different from the natural one. |
| 4915 | 2005-09-15 | Detection of the SR Infrared Emission of the Electron Bunches at DAΦNE | 2005 | LNF-05-12(NT).pdf | Alessio Bocci, Massimo Piccinini, Alessandro Drago, Diego Sali, Pierangelo Morini, Emanuele Pace, Augusto Marcelli | The synchrotron light emission is a radiation source covering a large energy domain from IR to x-ray energies, with an accurate sub-nanosecond time structure determined by the temporal and the physical structure of the stored electron bunches. With proper detectors, the synchrotron radiation emission can be used to perform spectroscopic experiments with very high time and spatial resolution but also to investigate the physical structure of the bunches. We present here the first characterization of the synchrotron light emission of DAΦNE in the midIR domain with a resolution time of few ns. Experiments have been performed using the SINBAD beamline, characterizing the emission of 105 bunches stored in the electron ring of the DAΦNE collider. With a small uncooled infrared detector optimized to work at a wavelength of 10.6 μm we observed the gap between individual bunches separated by about 8 ns, a time equivalent to a frequency of 125 MHz. |
| 4917 | 2005-09-15 | A New Concept for Streamer Quenching in Parallel Plate Chambers | 2005 | LNF-05-13(P).pdf | A. Calcaterra, R. de Sangro, G. Mannocchi, P. Patteri, P. Picchi, M. Piccolo, N. Redaelli, T. Tabarelli de Fatis, G.C. Trinchero | In this paper we propose a new concept for streamer quenching in Resistive Plate Chambers (RPCs). In our approach, the multiplication process is quenched by the appropriate design of a mechanical structure inserted between the two resistive electrodes. We show that stable performance is achieved with binary gas mixtures based on Argon and a small fraction of isobutane. Fluorocarbons, deemed responsible for the degradation of the electrode inner surface of RPC detectors, are thus fully eliminated from the gas mixture. This design also results in a much simplified assembly procedure. Preliminary results obtained with a few prototypes of “Mechanically Quenched RPCs” and some prospects for future developments are discussed. |
| 4914 | 2005-09-14 | Characterisation and Test of the Power Supply System of the Pamela Experiment | 2005 | INFN-TC-05-12.pdf | Valter Bonvicini, Stefano Ciano | This work describes the measurements and tests performed in Trieste in order to fully characterize the performance of the Power Supply System (PSS) of the space experiment PAMELA. The PSS behavior has been analyzed by means of an ad hoc designed set-up reproducing the electrical experimental conditions specified in the PAMELA ICD (Interface Control Document) and expected during the three-year lifetime of the mission. |
| 4913 | 2005-08-31 | FLUKA: A Multi-Particle Transport Code | 2005 | INFN-TC-05-11.pdf | Alfredo Ferrari, Paola R. Sala, Alberto Fassò, Johannes Ranft | This report describes the 2005 version of the Fluka particle transport code. The first part introduces the basic notions, describes the modular structure of the system, and contains an installation and beginner’s guide. The second part complements this initial information with details about the various components of Fluka and how to use them. It concludes with a detailed history and bibliography. |
| 4912 | 2005-07-18 | An Inexpensive Coincidence Circuit for the Pasco Geiger Sensors | 2005 | INFN-AE-05-7.pdf | Filippo Fichera, Paola La Rocca, Francesco Librizzi, and Francesco Riggi | A simple coincidence circuit was devised to carry out educational coincidence experiments involving the use of Geiger counters. The system was tested by commercially available Geiger sensors from PASCO, and is intended to be used in collaboration with high school students and teachers. |
| 4911 | 2005-07-14 | Second Order Harmonics Suppression With Glass Filters for Synchrotron UV Radiation Calibration Measurement | 2005 | LNF-05-11(IR).pdf | E. Burattini, A. De Sio, L. Gambicorti, F. Malvezzi, A. Marcelli, F. Monti, E. Pace | This development is the latest result of the cooperation between the National Laboratories of Frascati and the Department of Astronomy and Space Science of the University of Florence to improve the capabilities of the existing DXR-2 beam line at the DAΦNE-LIGHT laboratories. This collaboration has assessed a new facility in order to characterize optics and sensors in a wide spectral range (ranging from VUV to IR). Previous measurements [1] have highlighted some limitations in the present setup, as higher signal levels due to the diffracted radiation of the grating in the second order have to be removed to allow an accurate detection. In this work a glass filter is used to remove such spurious signal present in the spectral region with λ > 360 nm. The characteristics of the filter and its application to the optical system used to measure the sensitivity of a diamond-based photoconductor have been discussed. |
| 4910 | 2005-07-14 | Status of the MEG Experiment: Timing Counter Experimental Results | 2005 | INFN-AE-05-6.pdf | R. Valle, F. Gatti, S. Dussoni, G. Cecchet, M. Rossella and D. Zanello | The Timing Counter (TC) of the MEG experiment must achieve a time resolution equal or better than 100 ps FWHM (σ = 42.5 ps). The results obtained, at the Beam Test Facility (BTF) of Frascati/Italy, on two TC prototypes elements, permitted the selection of the scintillator, providing the best timing resolution, achieving an average resolution of 92 ps FWHM (σ = 39.2 ps) with a plastic scintillator. |
| 4909 | 2005-07-04 | Design, Implementation and Configuration of a GRID Site with a Private Network Architecture | 2005 | INFN-TC-05-10.pdf | Leonello Servoli, Mirko Mariotti, Francesco Truncellito | We present a possible solution for the configuration and implementation of a GRID site with the Worker Nodes belonging to a private network, using LCFGng as a tool for managing the configuration, and PBS as batch queueing system, in the framework of the INFN GRID. |
| 4908 | 2005-07-04 | Manuale di Installazione di un Servizio di Posta Elettronica Completo di Filtri Anti-Virus e Anti-Spam | 2005 | INFN-TC-05-9.pdf | Giorgio Bar, Alberto D’Ambrosio, Franca De Giovanni | Con il completamento della ristrutturazione dei servizi di calcolo centrali della Sez. INFN di Torino e dei Dipartimenti di Fisica dell’Università (Rif. INFN/TC-02/23 del 16/09/2002, più successivo lavoro di aggiornamento), si è colta l’occasione per redigere un manuale dettagliato di installazione del più complesso di questi servizi, quello di Posta Elettronica. Le istruzioni qui contenute, pur facendo riferimento alla piattaforma Unix da noi utilizzata (Tru64-UNIX 5.1A for Alpha) ed alla configurazione locale, hanno comunque validità generale per qualunque altra piattaforma Unix, e sono state redatte avvalendosi della collaborazione del Gruppo di Lavoro SEC-MAIL del GARR. |
| 4905 | 2005-06-01 | Daφne Lattice With Two Low–Beta Interaction Regions | 2005 | LNF-05-10(Thesis).pdf | Gabriele Benedetti | This doctoral thesis is focused on the development of the DAPHENE lattice to collide in the second interaction point where the FINUDA detector was installed in 2003. Modelling of the second interaction region and of the modified wigglers are described in detail. The constraints to be fulfilled by the lattice and the agreement between the model and the beam measurements are discussed. A model dependent technique for beam based alignment has been implemented for the mainrings. The developed procedure and its results are presented. |
| 4904 | 2005-06-01 | A Direct Search for the \\C\\P-Violating Decay $K_S\\,$~\\to~$\\,3\\pi^0$ with the KLOE Detector at DA$\\Phi$NE | 2005 | LNF-05-9(P).pdf | The KLOE Collaboration: F. Ambrosino, A. Antonelli, M. Antonelli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, D. Bowring, P. Branchini, R. Caloi, P. Campana, G. Capon, T. Capussella, F. Ceradini, S. Chi, G. Chiefari, P. Ciambrone, S. Conetti, E. De Lucia, A. De Santis, P. De Simone, G. De Zorzi, S. Dell'Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, B. Di Micco, A. Doria, M. Dreucci, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, C. Forti, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, E. Graziani, M. Incagli, W. Kluge, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, M. Martini, P. Massarotti, W. Mei, S. Meola, S. Miscetti, M. Moulson, S. M'uller, F. Murtas, M. Napolitano, F. Nguyen, M. Palutan, E. Pasqualucci, A. Passeri, V. Patera, F. Perfetto, L. Pontecorvo, M. Primavera, P. Santangelo, E. Santovetti, G. Saracino, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, M. Testa, L. Tortora, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura, R. Versaci, G. Xu | We have searched for the decay $K_S \\to 3 \\pi^{0}$ with the KLOE experiment at DA$\\Phi$NE using data from $e^+ e^-$ collisions at a center of mass energy $W\\sim m_{\\phi}c^2$ for an integrated luminosity \\L\\ = 450 pb$^{-1}$. The search has been performed with a pure \\ks\\ beam obtained by tagging with \\kl\\ interactions in the calorimeter and detecting six photons. We find an upper limit for the branching ratio of $1.2 \\times 10^{-7}$ at 90\\% C.L. |
| 4903 | 2005-05-27 | The Use of a Syncytium Model of the Crystalline Lens of the Human Eye to Study the Light Flashes Seen by Astronauts | 2005 | LNF-05-8(P).pdf | Giampietro Nurzia, Renato Scrimaglio, Bruno Spataro, Francesco Zirilli | A syncytium model to study some electrical properties of the eye is proposed in the attempt to explain the phenomenon of anomalous Light Flashes (LF) perceived by astronauts in orbit. The crystalline lensis modelled as an ellipsoidal syncytium having a variable relative dielectric constant. The mathematical model proposed is given by a boundary value problem for a system of two coupled elliptic partial differential equations in two unknowns. We use a numerical method to compute an approximate solution of this mathematical model and we show some numerical results that provide a possible (qualitative) explanation of the observed LF phenomenon. In particular, we calculate the energy lost in the syncytium by a cosmic charged particle that goes through the syncytium and compare the results with those obtained using the Geant 3.21 simulation program. We study the interaction antimatter-syncytium. We use the Creme96 computer program to evaluate the cosmic ray fluxes encountered by the International Space Station. |
| 4906 | 2005-05-19 | Comparison of Geant4 Electromagnetic Physics Models Against the Nist Reference Data | 2005 | INFN-AE-05-4.pdf | Katsuya Amako, Susanna Guatelli, Vladimir N. Ivanchenko, Michel Maire, Barbara Mascialino, Koichi Murakami, Petteri Nieminen, Luciano Pandola, Sandra Parlati, Maria Grazia Pia, Michela Piergentili, Takashi Sasaki, Laszlo Urban | The Geant4 Simulation Toolkit provides an ample set of physics models describing electromagnetic interactions of particles with matter. This paper presents the results of a series of comparisons for the evaluation of Geant4 electromagnetic processes with respect to NIST reference data. A statistical analysis was performed to estimate quantitatively the compatibility of Geant4 electromagnetic models with NIST data; the statistical analysis also highlighted the respective strengths of the different Geant4 models |
| 4902 | 2005-05-19 | Design and RF Measurements of an X-Band Accelerating Structure for Linearizing the Longitudinal Emittance at Sparc | 2005 | LNF-05-7(P).pdf | D. Alesini, A. Bacci, P. Chimenti, V. Chimenti, A. Clozza, A. Falone, V. Lollo, M. Migliorati, A. Mostacci, F. Palpini, L. Palumbo, B. Spataro | The paper presents the design of an X-band accelerating section for linearizing the longitudinal phase space in the Fractal Linac Coherent Light Source (SPARC). The nine cells structure, operating on the standing wave mode, is fed by a central coupler and has been designed to obtain a 42 MV/m accelerating gradient. The 2D profile has been determined using the electromagnetic codes Super fish and Oscar-2D while the coupler has been designed using HFSS. Bead-pull measurements made on a copper prototype have been done and the results are illustrated and compared with the numerical ones. Mechanical details of the realized prototype and RF properties of the structure as a function of the assembly characteristics are also discussed. |
| 4900 | 2005-05-09 | Rectangular Pulse Formation in a Laser Harmonic Generation | 2005 | INFN-BE-05-1.pdf | Simone Cialdi, Fabrizio Castelli, Ilario Boscolo | In a harmonic generation process the temporal profile of the up-converted pulse undergoes significative changes depending on the input profile and crystal length. A simple theoretical treatment and the corresponding physical view are presented. The matter and the properties of two shaping systems are investigated in view of producing rectangular up-converted pulses as required by laser driven radiofrequency electron sources. |
| 4901 | 2005-05-09 | Electroweak Corrections Uncertainty on the W Mass Measurement at Lep | 2005 | INFN-AE-05-3.pdf | Fabio Cossutti | The systematic uncertainty on the $W$ mass and width measurement resulting from the imperfect knowledge of electroweak radiative corrections is discussed. The intrinsic uncertainty in the 4-$f$ generator used by the DELPHI Collaboration is studied following the guidelines of the authors of {\\tt YFSWW}, on which its radiative corrections part is based. The full DELPHI simulation, reconstruction and analysis chain is used for the uncertainty assessment. A comparison with the other available 4-$f$ calculation implementing DPA $\\mathcal{O}(\\alpha)$ corrections, {\\tt RacoonWW}, is also presented. The uncertainty on the $W$ mass is found to be below 10 MeV for all the $WW$ decay channels used in the measurement. |
| 4897 | 2005-04-21 | La Scheda Avi (Atom to Vme Interface) per L’Apparato Exodet | 2005 | INFN-TC-05-6.pdf | Antonio Anastasio, Vincenzo Masone, Pasquale Parascandolo | Questa nota descrive la scheda AVI da noi sviluppata e che è stata utilizzata sull’apparato EXODET dapprima ai Laboratori Nazionali di Argonne (USA), poi presso i Laboratori di Riken (Giappone) ed attualmente ai Laboratori Nazionali di Legnaro. La scheda AVI (ATOM to VME Interface) funziona da modulo di interfaccia con il chip ATOM sviluppato originariamente per l’esperimento BaBar. |
| 4898 | 2005-04-21 | Un Preamplificatore di Carica per le Interazioni Laser | 2005 | INFN-TC-05-7.pdf | Raimondo Chiaramonte, Pasquale Parascandolo | Questa nota descrive un preamplificatore di carica a basso costo sviluppato per trattare i segnali di front-end in uscita dal fotomoltiplicatore dello spettrometro usato in un esperimento per la misura di armoniche di ordine elevato in molecole allineate. |
| 4899 | 2005-04-21 | Una Sonda Attiva a Basso Costo | 2005 | INFN-TC-05-8.pdf | Pasquale Parascandolo, Antonio Vanzanella | Questa nota descrive la realizzazione di una sonda attiva basata su componenti a basso costo e di elevata banda passante che consente di effettuare all’oscilloscopio, direttamente sul circuito in esame, oltre che una misura del segnale anche una misura realistica del rumore. |
| 4896 | 2005-04-11 | Impedances of the Cold Bore Experiment, Coldex, Installed in the SPS Machine | 2005 | LNF-05-6(P).pdf | B. Spataro, D. Alesini, M. Migliorati, A. Mostacci, L. Palumbo, V. Baglin, B. Jenninger, F. Ruggiero | This note focuses on the impedances evaluation of the cold bore experiment called COLDEX, and installed in the SPS machine. A comparison between analytical model and numerical results is presented. Tests on power losses are also shown. |
| 4895 | 2005-04-07 | Annual Report 2004 | 2005 | LNF-05-5(IR).pdf | AA.VV. | |
| 4894 | 2005-04-04 | Analysis of Neutron and Muon Counting During a Forbush Decrease | 2005 | INFN-AE-05-2.pdf | Paola La Rocca and Francesco Riggi | Data measured with a small Geiger counter during a Forbush decrease were compared to neutron and muon fluxes reported by professional monitor stations. Correlation between neutron and muon rates was studied and compared to results obtained outside the Forbush decrease. |
| 4892 | 2005-02-23 | Microwave Apparatus for Gravitational Waves Observation | 2005 | INFN-TC-05-5.pdf | R. Ballantini, A. Chincarini, S. Cuneo, G. Gemme, R. Parodi, A. Podestà, and R. Vaccarone; Ph. Bernard, S. Calatroni, E. Chiaveri, and R. Losito; R.P. Croce, V. Galdi, V. Pierro, and I.M. Pinto; E. Picasso | In this report the theoretical and experimental activities for the development of superconducting microwave cavities for the detection of gravitational waves are presented. |
| 4891 | 2005-02-22 | Proposal of a Bunch Length Modulation Experiment in DAΦNE | 2005 | LNF-05-4(IR).pdf | D. Alesini, G. Benedetti, M. Biagini, C. Biscari, R. Boni, M. Boscolo, A. Clozza, G. Delle Monache, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, M. Incurvati, C. Ligi, F. Marcellini, G. Mazzitelli, C. Milardi, L. Pellegrino, M. Preger, P. Raimondi, R. Ricci, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, C. Vaccarezza, M. Vescovi, M. Zobov, C. Pagani, E. Levichev, P. Piminov, D. Shatilov, J. Byrd, F. Sannibale, J. Fox, D. Teytelmann | We propose an accelerator physics experiment in DAΦNE to prove the regime of bunch length modulation in storage rings, which has never been tested before in any existing accelerator. The result of the experiment can be of great interest for the future colliders and for the synchrotron light sources. The concept has been developed at the Divisione Acceleratori in the framework of super-factory studies. Collaborations with international groups interested in the experiment have been set-up. |
| 4889 | 2005-02-18 | Il Progetto ScienzaPerTutti:la Fisica in Rete | 2005 | LNF-05-3(P).pdf | L. Benussi, H. Bilokon, R. Baldini, P. de Simone, A. C. De Vitis, E. Durante, F.L. Fabbri, G. Isidori, G. Nicoletti, P. Modestino, P. Patteri, C. Petrascu, S. P. Ratti, F. R. Romano, D. Sirghi e P. Valente | ScienzaPerTutti (http://scienzapertutti.lnf.infn.it) sviluppa un progetto di comunicazione/divulgazione sui temi della scienza, rivolto al pubblico generico con particolare attenzione al mondo della scuola. Realizzato da ricercatori dei Laboratori Nazionali di Frascati dell’INFN, in due anni ha totalizzato oltre 1500000 accessi. Caratteristiche qualificanti sono: comunicazione diretta tra chi produce e chi fruisce della scienza; dichiarata contaminabilità agli idiomi comunicativi del mondo giovanile; dinamicità dei contenuti che qualificano il sito, più che come opportunità occasionale di visita, come periodico evento-appuntamento in rete. Lo sviluppo del progetto si basa su un comitato redazionale permanente, sulla collaborazione d’esperti, ma anche sui contributi dei web-nauti visitatori. |
| 4890 | 2005-02-18 | Realizzazione di un Sistema di Autenticazione ed Autorizzazione Centralizzato Basato su Kerberos 5 e OpenLDAP | 2005 | INFN-TC-05-4.pdf | Domenico Diacono | In questa nota tecnica si illustra dettagliatamente la procedura per la realizzazione di un servizio di autenticazione ed autorizzazione centralizzata, utilizzando rispettivamente Kerberos V e openLDAP, su sistema operativo GNU/Linux. Le indicazioni sono relative in particolare alla distribuzione Gentoo, ma sono facilmente adattabili a qualsiasi distribuzione. Come esempio di servizio che fa uso della struttura creata viene descritta l’installazione di una nuova cella AFS direttamente autenticata dai KDC Kerberos, e la preparazione di una macchina di “public login”, alla quale è possibile collegarsi usando un utente LDAP con la sua password Kerberos 5 e la home directory nella nuova cella AFS. |
| 4888 | 2005-02-15 | Nanotubes for Particle Channeling, Radiation and Electron Sources | 2005 | LNF-05-2(P).pdf | S. Bellucci | Carbon nanotubes consist in graphene sheets rolled into seamless hollow cylinders with diameters ranging from 1 nm to about 50 nm. They have been produced as both single-walled and multi-walled nanotubes. The diameter of the MWNTs typically ranges from 10 to 50 nm, while the length exceeds 10 micron. For SWNTs, the diameter is only 1 nm and the length is up to 100 micron. Nanotubes exhibit unique physical and chemical properties as being a quasi-one dimensional material. The main involvements of the INFN-LNF group in channeling researches are described, i.e. channeling of high energy beams in nanotubes (with the synthesis and characterization of the ordered nanotube samples), crystal extraction and collimation at IHEP (with the design and production of the bent crystals), crystal undulator R & D (with the characterization of the crystal undulator prototypes with SEM and the positron beam). We consider a precise determination of the optimal experimental conditions for channeling of accelerated particles (protons, positrons, photons, neutrons) through micro- and nano-structured crystals and films of aligned nanotubes, as promising candidates for producing highly focused beams. |
| 4887 | 2005-02-10 | CP Violation in B Mesons Decays: A Review After Five Years of B-Factories | 2005 | LNF-05-1(P).pdf | I. Peruzzi | |
| 4883 | 2005-01-27 | The Silicon Laboratory in Udine: Quality Assurance Tests on the Wafer Sensors for the Atlas Pixel Detecto | 2005 | INFN-AE-05-1.pdf | G. Cabras, S. D’ Auria, D. Cauz, D. Cobal, M. Cobal, B. De Lotto, C. Del Papa, S. Gorokhov, H. Grassmann, L. Santi | In this note we describe the set-up that has been implemented in the Silicon laboratory at the Physics Department of the University of Udine, in order to perform the quality tests on the wafer sensors for the ATLAS Pixel Detector. The Quality Control Procedure to be fulfilled by the participating institutes is described in an ATLAS protocol. At our institute the pre-production measurement phase has recently been completed, while the production phase is running. A brief description of the measurements and a summary of the results obtained are also presented. |
| 4886 | 2005-01-27 | A New Monte Carlo - GEANT4 Simulation Tool for the Development of a Proton Therapy Beam Line and Verification of the Related Dose Distributions | 2005 | INFN-TC-05-3.pdf | G.A.P. Cirrone, G. Cuttone, S. Guatelli, S. Lo Nigro, B. Mascialino, M.G. Pia, L. Raffaele, G. Russo, M.G. Sabini | Using the Monte Carlo simulation tool GEANT4 we simulated the hadron-therapy beam line of the CATANA (Centro di AdroTerapia ed Applicazioni Nucleari Avanzate) center. This is the unique italian hadron-therapy facility in which 62 MeV proton beams are used for the radiotherapeutic treatment of choroidal and iris melanomas. All the elements, such as diffusers, range shifters, collimators and detectors, typical of a proton-therapy line were modelled. The beam line provides an ideal environment for the experimental testing and validation of the software developed. The software architecture was developed, and the validation of the software is in its final stage. Simulated ranges, energy distribution, depth and lateral dose distributions for full energy proton beams will be compared tothe experimental results obtained at LNS (Laboratori Nazionali del Sud) with different detectors. |
| 4885 | 2005-01-25 | Esperimento THALAS: Analisi Dei Rischi e Pericoli del Prototipo Biosuscettometro | 2005 | INFN-TC-05-2.pdf | S. Cuneo, F. Gastaldo, B. Gianesin, M. Marinelli, E. Oliveri, G. Sobrero | Il documento descrive l’analisi dei rischi dell’apparecchiatura denominata “biosuscettometro” così come progettata per la realizzazione di un prototipo destinato all’applicazione su pazienti e volontari sani presso l’Ospedale Galliera di Genova. |
| 4884 | 2005-01-24 | Esperimento THALAS: Relazione Tecnica Progettazione Meccanica Prototipo Biosuscettometro | 2005 | INFN-TC-05-1.pdf | S. Cuneo, B. Gianesin, M. Marinelli, R. Puppo, G. Sobrero | Il documento descrive i calcoli strutturali eseguiti a verifica della stabilità meccanica dell’apparato denominato “biosuscettometro”, così come progettato per la realizzazione di un prototipo destinato all’applicazione su pazienti volontari presso l’Ospedale Galliera di Genova. |
| 4882 | 2004-12-22 | Are Small Single Geiger Counters Able to Show up Cosmic Daily Variation Effects? A Case Study for Educational Investigations | 2004 | INFN-AE-04-14.pdf | Paola La Rocca and Francesco Riggi | Data measured with a small Geiger counter for a period of approximately three months were analyzed to search for daily variation effects, after proper correction for the influence of the atmospheric pressure. Harmonic dial analysis for each individual day was carried out. The ratio of the measured flux between selected intervals within the 24 hours was also investigated. Methods and results are presented in the framework of educational studies involving high-school teams. |
| 4881 | 2004-12-22 | An Abstract Model of the Virtual Organization Membership Service | 2004 | INFN-TC-04-18.pdf | Sergio Andreozzi, Vincenzo Ciaschini, Luca dell'Agnello | Grid systems involve the coordination of resources and services that are not subject to centralized control, span multiple trust domains and are accessible by a large number of users. They require a functionality for mapping users and credentials that exist at the virtual level to users and credentials that exist at the physical level. In this paper, we present a rigorous modeling of the Virtual Organization Membership Service (VOMS), a credential-based access control system. It enables the management and secure distribution of roles, groups and capabilities of users at the virtual level by improving both scalability and flexibility aspects. |
| 4880 | 2004-12-22 | Neutrino Long Base Line Experiments in Europe | 2004 | LNF-04-29(P).pdf | F. Ronga | A short summary of the past, present and future neutrino experiments in Europe is given. The main emphasis is on long base line accelerator experiments. |
| 4893 | 2004-12-22 | Caratterizzazione di un Fotoconduttore Basato su Singolo Cristallo di Diamante 1b Mediante Luce di Sincrotrone | 2004 | LNF-04-30(IR).pdf | E. Burattini, A. De Sio, F. Malvezzi, A. Marcelli, F. Monti, E. Pace | Questo rapporto mostra i risultati di alcune misure di calibrazione di rivelatori UV basati su film di diamante sintetico, utilizzando il setup esistente sul canale di luce di sincrotrone DXR-2 disponibile presso il Laboratorio DAΦNE-L dei Laboratori Nazionali di Frascati. Lo scopo di queste misure è effettuare una valutazione del funzionamento e delle caratteristiche della beamline, in relazione alla possibilità di trasformare la strumentazione della linea stessa e adattarla alle necessità sperimentali per fare misure di test e caratterizzazione di rivelatori e sistemi ottici nelle bande spettrali che vanno dall’UV da vuoto al vicino IR. I risultati mostrano i limiti attuali della beamline per l’uso sull’intervallo desiderato, ma al contempo evidenziano le potenzialità della luce di sincrotrone per la caratterizzazione di rivelatori, potenzialità del resto già note. |
| 4879 | 2004-12-09 | Chemical and Magnetic Characterization of the Steels for the Opera Spectrometers | 2004 | LNF-04-28(IR).pdf | A.Cecchetti, B.Dulach, D.Orecchini, G.Peiro, F.Terranova | A full characterization of the chemical and magnetic properties of the steels for the OPERA magnetic spectrometers has been carried out during mass production. In the following, we present the results and discuss the impact of the different steel responses on the B-field maps and on the physics performance of the detectors. |
| 4877 | 2004-11-23 | Reconstruction of the K*(892)0 Resonance Signal in pp Collisions at the LHC Regime Through the Alice Detector | 2004 | INFN-AE-04-12.pdf | Angela Badalà, Roberto Barbera, Giuseppe Lo Re, Armando Palmeri, Alberto Pulvirenti, Giuseppe S. Pappalardo and Francesco Riggi | The reconstruction of the physics signal due to the decay of K*(892)0 and its antiparticle into K\\pi in pp collisions at the energetic regime planned for the Large Hadron Collider (LHC) has been investigated by a full simulation carried out within the environment of the ALICE detector. The event mixing technique was used to evaluate the combinatorial background. The role of particle identification of the decay products is discussed. Detection efficiency and statistical significance are reported. |
| 4878 | 2004-11-23 | Long Term Monitoring of Cosmic Ray Flux And Atmospheric Pressure: Estimation of the Barometric Coefficient by a Simple Geiger Counter | 2004 | INFN-AE-04-13.pdf | Barbara Famoso, Paola La Rocca and Francesco Riggi | In this document we want to discuss the possibility to observe the barometric effect and to extract an estimate of the barometric coefficient by the use of a simple and inexpensive experimental set-up. To this aim, atmospheric pressure and cosmic muon flux at sea level were continuously monitored for a period of about three months, using a small Geiger counter, together with an atmospheric pressure sensor. An accurate analysis of the data collected led to a value for the barometric coefficient of (0.051±0.015) %/mbar, in accordance with the expected value. This result showed that the study of the barometric effect does not necessarily require sophisticated apparata but can be easily carried out with equipments that even a high school could dispose of. For this reason such kind of measurements could offer to high school students a good opportunity to approach the field of experimental high-energy physics. |
| 4875 | 2004-11-17 | Select Experimental Trends in Astro-Particle Physics in Space | 2004 | LNF-04-26(IR).pdf | D. Babusci, C. Curceanu(Petrascu), S. Dell'Agnello, G. Delle Monache, M.A. Franceschi, M. Ricci, R. Vittori | This report is in part based on the contribution to the Detector Working Group presented at the meeting on LNF long term planning, held on May 7, 2004, at INFN-LNF (Frascati, Italy). The initial work has been expanded, in some case evolving into experimental R&D work on new activities (LAZIO-SiRad and LARES). We will describe: (i) satellites with magnetic spectrometers for particle physics in low earth orbits (LEO, ~ 400 Km), (ii) the idea of networks of µ-satellites (for example to monitor the short term instability of the Van Allen belts); (iii) stratospheric balloon-based experiments; (iv) satellite laser-ranging experiments for testing the frame-dragging effects predicted by general relativity (GR), the equivalence principle and, possibly, forsetting bounds on string-inspired brane theoretical models. We think that this document can be the starting point for future and further work in astro-particle physics in space at LNF. |
| 4876 | 2004-11-17 | A Power Supply Study for the Ramping Dipoles of the Synchrotron Ring of the CNAO Project | 2004 | LNF-04-27(IR).pdf | M. Incurvati, C. Sanelli | A hadrons (Protons and light Carbon ions) synchrotron accelerator is in construction under the responsibility of the CNAO (Centro Nazionale di Adroterapia Oncolociga) and INFN finalized to the therapy of deep tumours. The accelerator complex is composed of two ion sources, a linear accelerator, a low energy and medium energy transfer lines that will transfer the ion beam to the synchrotron ring, where the beams will be accelerated to the prescribed beam energy according to the deep to which the beam energy (Bragg peak) and the dose amount must be released. Only one high energy transfer line is foreseen at this stage of the project. This transfer line will drive the beam to three treatment rooms, corresponding to three horizontal beam lines and one vertical beam line. Additional high energy transfer lines are foreseen in second phase of the project. The synchrotron ring is constituted of 16 H shaped bending dipoles that will accelerated the ion beams till to the requested extraction energy. These bending dipoles must be powered by means of a suitable power supply, 3000 A – 1600 V, that must accomplish the acceleration cycle in less than 1.6 s. The characteristics and performances of such challenging power supply are described in this note. A 24 pulse SCR based topology is proposed, and control circuitry simulations are developed together with a deep analysis of the expected output current shape in terms of current ripple and residual current error. |
| 4873 | 2004-11-15 | A Scintillating-fiber Beam Profile Monitor for the DAFNE BTF | 2004 | LNF-04-24(IR).pdf | M. Anelli, B. Buonomo, G. Mazzitelli and P. Valente | A scintillating-fiber beam profile detector has been designed, built and tested, for the monitoring of the position and size of the electron beam of the DAFNE, the recently commissioned electron beam-test facility at the Frascati LNF. A description of the detector construction and assembly, together with the results achieved during the 2003-2004 run, are here reported. |
| 4874 | 2004-11-15 | A Novel Approach for an Integrated Straw Tube-Microstrip Detector | 2004 | LNF-04-25(P).pdf | E. Basile, F. Bellucci, L. Benussi, M. Bertani, S. Bianco, M.A. Caponero, D. Colonna, F. Di Falco, F.L. Fabbri, F. Felli, M. Giardoni, A. La Monaca, G. Mensitieri, B. Ortenzi, M. Pallotta, A. Paolozzi, L. Passamonti, D.Pierluigi, C. Pucci, A. Russo, G. Savian, S. Tomassini | We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell® lattice and carbon fiber reinforced plastic shell. Results on mechanical and test beam performances are reported on as well. |
| 4872 | 2004-11-03 | The Geant4 REMSIM Simulation for Dosimetry in Interplanetary Manned Space Missions | 2004 | INFN-AE-04-11.pdf | Susanna Guatelli, Maria Grazia Pia | The study of the dosimetric effects of space radiation on astronauts is an important concern of space missions for the exploration of the Solar System. To protect the crew, shielding must be designed, the environment must be anticipated and monitored and a warning system must be put in place. A Geant4 simulation has been developed for a first quantitative study of existing vehicle concepts and planet surface habitat designs, and the radiation exposure of crews therein. We will show first results of the dosimetric analysis of proposed shielding solutions in the selected geometrical set-ups, complemented with a critical analys is of the Geant4 tools currently available for this type of studies. |
| 4871 | 2004-10-26 | Implementazione di un VPN Server Utilizzando il Cisco VPN Concentrator 3005 | 2004 | INFN-TC-04-17.pdf | Riccardo Veraldi, Francesca Del Corso | Le VPN rappresentano una soluzione valida per il transito di traffico di tipo privato su rete pubblica, offrendo un servizio importante agli utenti che al di fuori delle sezioni INFN abbiano l’esigenza di potere accedere alle risorse e all’ambiente della LAN in modo trasparente, sicuro ed economico. Di seguito è presentato uno studio di implementazione del servizio VPN attraverso l’utilizzo del Cisco VPN Concentrator 3005. Sono delineate le procedure per la configurazione del servizio con soluzioni che vogliono privilegiare l’aspetto della sicurezza attraverso l’uso dei certificati digitali. Il seguente documento vuole essere una guida operativa per il LAN Manager che intende adottare questa soluzione. |
| 4869 | 2004-10-26 | Statistical Strained-Tetrahedron Model Of Local Ternary Zincblende Crystal Structures | 2004 | LNF-04-23(P).pdf | B.V.Robouch, E.M.Sheregii, A.Kisiel | A statistical strained-tetrahedron model developed to better describe and understand the local structure of ternary zincblende crystals, interprets experimental EXAFS and far-infrared spectra. it considers five tetrahedron configurations distorted in shape and size, characteristic of ternary zincblende alloys, allows non random distributions, hence site occupation preferences, conserves coordination numbers, respects stoichiometry, and assumes next neighbor values determine preferences beyond next neighbor. Configuration probabilities have three degrees of freedom. The nineteen inter-ion crystal distances are constrained by tetrahedron structures; to avoid destructive stresses, we assume average tetrahedron volumes of both sublattices to relax to equal values. the number of distance free-parameters ≤7. Model estimates, compared to published EXAFS results, validate the model. knowing configuration probabilities, one writes the dielectric function for far-Infrared absorption or reflection spectra. Constraining assumptions restrict the number of degrees of freedom. unfolding experimental spectra yields SOP coefficient values and\\or specific oscillator strengths. validation again confirms the model. |
| 4870 | 2004-10-25 | The Extension and Shape of the Collecting Zones of the Galactic Cosmic Rays From Helium to Iron | 2004 | INFN-AE-04-10.pdf | Antonio Codino, François Plouin | Hundreds millions of cosmic-ray trajectories, from Helium to Iron, have been simulated in the galactic disk in order to calculate the mean distance of cosmic-ray sources from the Earth. The dominant parameters affecting this distance is the galactic magnetic field which makes cosmic-ray trajectories much longer, about 3 orders of magnitudes, than the physical distance from the source to the Earth. The calculations indicate that cosmic-ray sources powering the local flux around the Earth are mainly disseminated along the regular magnetic field lines of the Galaxy. The spatial distribution of the sources form characteristic figures in the disk volume, the collecting regions of cosmic rays. Assuming cosmic-ray sources to be uniformly distributed in the disk of the Milky Way, at the arbitrary energy of 1 TeV/u, the typical length and width of these regions are 29.9 and 0.53 kpc for Helium and 20.0 and 0.27 kpc for Iron. The mean physical distance of cosmic-ray sources from the Earth turns out to be 3.5 kpc for Helium and 1.6 kpc for Iron. |
| 4868 | 2004-10-25 | High Energy Beta Beams Without Massive Detector | 2004 | LNF-04-22(P).pdf | F. Terranova, A. Marotta, P. Migliozzi, M. Spinetti | In this paper, the possibility to exploit a high energy beta beam without massive detectors is discussed. The radioactive ions are boosted up to very high $\\gamma$ with the neutrino beam pointing towards an instrumented surface located at a moderate baseline (e.g. from CERN to the Gran Sasso Laboratories). $\\nu_e \\rightarrow \\nu_\\mu$ oscillations and their CP conjugate are tagged as an excess of horizontal muons produced in the rock and tracked by the low-mass instrumented surface installed in one of the LNGS experimental halls. We show that the performance of this complex for what concerns the determination of the $\\theta_{13}$ angle of the leptonic mixing matrix is comparable with the current low-$\\gamma$ design based on a gigantic water Cherenkov at Frejus. |
| 4865 | 2004-10-15 | A New Configuration for a Strawtubes - MicrostripsDetector | 2004 | LNF-04-19(P).pdf | E. Basile, F. Bellucci, L. Benussi, M. Bertani, S. Bianco, M.A. Caponero, D. Colonna, F. Di Falco, F.L. Fabbri, F. Felli, M. Giardoni, A. La Monaca, G. Mensitieri, B. Ortenzi, M. Pallotta, A. Paolozzi, L. Passamonti, D.Pierluigi, C. Pucci, A. Russo, G. Saviano, S. Tomassini | We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell® lattice and CFRP shell. |
| 4866 | 2004-10-15 | Statistical Analysis of Inter-Ionic Distances and Occupation Preferences In Ternary Zincblende And Wurzite Structured Crystal | 2004 | LNF-04-20(P).pdf | B.V. Robouch, E.M. Sheregii, A. Kisiel | The statistical strained-tetrahedron model was developed to overcome two common assumptions of previous models: 1) rigid undistorted ion sublattice of regular tetrahedra throughout all five configurations and 2) random ion distribution. These simplifying assumptions restrict the range of applicability of the models to a narrow subset of ternary alloys for which the constituent binaries have their lattice constants and standard molar enthalpies of formation (ΔfH0) equal or quasi-equal. Beyond these limits predictions of such models become unreliable, in particular, when the ternary exhibits site occupation preferences (SOPs). The strained-tetrahedron model, free from rigidity and stochastic limitations, was first developed to interpret structural information obtained with the use of x-ray absorption experimental data. It was validated on published EXAFS data of both zincblende (ZB) and intermetallide materials. The model was then extended to describe and interpret infrared spectra. The derivation and verification of the validity of our model and its assumptions are detailed in our published papers. We extend the model to cover the interpretation of far IR spectra and successfully apply it to a set of GaAsyP1-y spectra. The unfolding gives the SOP coefficient values and\\or specific oscillator strengths (OSs). Comparison with data available in the literature showed the good agreement of our model predictions. |
| 4867 | 2004-10-15 | Local Structure Properties of Ga1-xAlxN Epitaxial Layer | 2004 | LNF-04-21(IR).pdf | B.V. Robouch, A. Kisiel, E. Burattini, I. Kutcherenko, L.K. Vodopyanov | The strained-tetrahedron model is used to analyze the wurzite structure of epitaxial GaAlN thin films on a sapphire substrate. Site occupation preference (SOP) coefficients and first two shell inter-ion distances are calculated in the ideal wurzite structure approximation. The coefficient values W1=0, W2=1.86, and W3=1, indicate a strong deviation from a random distribution with preference of Ga-N to Al-N pairs. This suggests that GaAlN thin films could be less homogeneous and more difficult to grow beyond 50% AlN. Also the far-infrared GaAlN phonon spectra should exhibit only four strong lines instead of eight. |
| 4864 | 2004-09-30 | GLUE Schema Implementation for the LDAP Data Model | 2004 | INFN-TC-04-16.pdf | Sergio Andreozzi | |
| 4863 | 2004-09-06 | Pilot Production Grid Infrastructure For High Energy Physics Applications | 2004 | INFN-TC-04-15.pdf | Sergio Andreozzi, Daniele Bonaccorsi, Vincenzo Ciaschini, Alessandro Cavalli, Flavia Donno, Sergio Fantinel, Federica Fanzago, Antonia Ghiselli, Alessandro Italiano, Mirco Mazzucato, Andrea Sciaba, Heinz Stockinger, Gennaro Tortone, Marco Verlato, Cristina Vistoli | Current Data Grid tools are enhancing and getting more mature. On the other hand, several application users express their needs and requirements to deploy Grid tools in their daily work. Thus, there is a strong need that Grid tools make the transition from prototype tools to production tools. We have made several improvements and additions to an early release of the European DataGrid software tools in order to meet the requirements of data intensive sciences. We show that our software release is stable and performs well in order to be used in an international production infrastructure for physics data simulation with one High Energy Physics experiment. Furthermore, we outline the experience with interoperability solutions from the Grid Laboratory Uniform Environment (GLUE) activity. |
| 4862 | 2004-07-30 | Papers presented at EPAC 2004 | 2004 | LNF-04-18(P).pdf | Accelerator Division | |
| 4856 | 2004-07-29 | First Results on Hypernuclear Spectroscopy from the FINUDA Experiment at DAFNE | 2004 | LNF-04-12(P).pdf | M. Agnello, G. Beer, L. Benussi, M. Bertani, S. Bianco, E. Botta, T. Bressani, L. Busso, D. Calvo, P. Camerini, P. Cerello, B. Dalena, F. De Mori, G. D'Erasmo, D. Di Santo, F.L. Fabbri, D. Faso, A. Feliciello, A. Filippi, V. Filippini, E.M. Fiore, H. Fujioka, P. Gianotti, N. Grion, A. Krasnoperov, V. Lucherini, S. Marcello, T. Maruta, N. Mirfakhrai, O. Morra, A. Olin, E. Pace, M. Pallotta, M. Palomba, A. Pantaleo, A. Panzarasa, V. Paticchio, S. Piano, F. Pompili, R. Rui, G. Simonetti, H. So, S. Tomassini, R. Wheadon, A. Zenoni | FINUDA is the hypernuclear physics experiment carried out at DA$\\Phi$NE, the $e^+e^- \\, \\phi$-factory of the INFN Frascati Laboratory. The aim of the experiment is to study simultaneously the formation and decay of hypernuclei produced by the strangeness exchange reaction induced by the stopped $ K^-$ coming from the decay of the $\\rm {\\phi(1020)} $ mesons. This paper presents the first preliminary results concerning spectrometer performances, hypernuclear formation and decay from the first FINUDA data set. |
| 4858 | 2004-07-29 | New Focus Results On Charm Physics | 2004 | LNF-04-14(P).pdf | S.Bianco (on behalf of the FOCUS Coll.) | New results from the photoproduction experiment FOCUS are reported: Dalitzplot analysis, semileptonic form factor ratios and excited meson spectroscopy. |
| 4855 | 2004-07-29 | Optimization of Superconducting Coils for Solar Cosmic Rays Protection During Interplanetary Missions | 2004 | INFN-TC-04-14.pdf | Linda Imbasciati, Lucio Rossi, Massimo Sorbi, Piero Spillantini | During manned interplanetary missions, it is necessary to protect the crewmembers from the high energetic solar cosmic rays, mainly protons. A feasible solution consists of an active shield by means of a superconducting magnet. This magnetic lens is able to deflect the almost unidirectional solar cosmic rays away from the zone that can be occupied by crewmembers. Our study indicates that an air core toroid with inner diameter of 0.5 m and outer diameter of 3.5 m and a peak field of 2.80 T is suitable for astronaut protection. In this paper the detailed magnetic, mechanical and thermal design is presented, and different configurations for the superconducting coils are compared in order to find the most efficient and convenient solution in such a complex environment. |
| 4852 | 2004-07-06 | Qlasa: A Computer Code For Quench Simulation In Adiabatic Multicoil Superconducting Windings | 2004 | INFN-TC-04-13.pdf | Lucio Rossi, Massimo Sorbi | Abstract Prediction of the quench evolution is an important task in designing superconducting magnets. Especially when different coils are coupled together, with possibility of energy exchange among them, very dangerous situation may happen, not easy to predict with simple analytical evaluation. The code QLASA described in this report is originated from the codes DYNQUE and QLASA in use at the superconducting magnet group of the LASA laboratory (University and INFN-Milan): it is mainly intended for adiabatic multiple solenoids, with different power supplies, but can now deal partially with different geometries. It can be used as a design tool, since it allows to control many parameters, it treats the windings as a medium of average properties (that may differ along the three dimensions) and it is coupled with an extensive custom library of cryogenic properties, although its main use has been restricted so far to NbTi and Nb3Sn conductors. It is particularly useful when internal voltages and internal temperatures need to be computed. The report describes the winding modeling, all steps of thermal and electrical computations and how they are separated as well as the coupling with the cryogenic library. The limitations of the codes, written in F77, are explained and underlined, as well as the suggestion to use it in geometry different from the axis-symmetric. Finally a few examples of input files are given and comparisons among predictions and experiments are reported. |
| 4853 | 2004-07-06 | A Statistical Toolkit for Data Analysis | 2004 | INFN-AE-04-9.pdf | Stefania Donadio, Susanna Guatelli, Barbara Mascialino, Andreas Pfeiffer, Maria Grazia Pia, Alberto Ribon, Paolo Viarengo | The present project aims to develop an open-source and object-oriented software Toolkit for statistical data analysis. Its statistical testing component contains a variety of Goodness-of-Fittests, from Chi-squared to Kolmogorov-Smirnov, tolessknown, but generally much more powerful tests such a sAnderson-Darling, Goodman, Fisz-Cramer-vonMises, Kuiper, Tiku. Thanks to the component-based design and the usage of the standard abstract interfaces for data analysis, this tool can be used by other data analysis systems or integrated in experimental software frameworks. This Toolkit has been released and is downloadable from the web. In this paper we describe the statistical details of the algorithms, the computational features of the Toolkit and describe the code validation. |
| 4851 | 2004-06-29 | La Controller Board dello Spettrometro di Muoni dell’esperimento Opera | 2004 | INFN-TC-04-12.pdf | Vincenzo Masone | Questa nota descrive la scheda Controller Board (CB) progettata nell’ambito dell’esperimento OPERA in allestimento presso i Laboratori Nazionali del Gran Sasso. Scopo principale del progetto è la realizzazione di un’interfaccia tra le schede di Front-End collegate ai rivelatori ed il sistema di acquisizione basato sullo standard Ethernet. I dati d’ingresso sono sottoposti ad un processo di soppressione degli zeri e successivamente immagazzinati in attesa di essere acquisiti. Per la gestione della scheda è stato implementato un protocollo di controllo, basato sullo standard RS-232, che costituisce un sistema alternativo di acquisizione dei dati provenienti dalle Front-End Boards. |
| 4850 | 2004-06-21 | A Goodness-of-Fit Statistical Toolkit | 2004 | INFN-AE-04-8.pdf | G.A.P. Cirrone, S. Donadio, S. Guatelli, A. Mantero, B. Mascialino, S. Parlati, A. Pfeiffer, M.G. Pia, A. Ribon, P. Viarengo | Statistical methods play a significant role through out the life-cycle of physics experiments, being an essential component of physics analysis. The present project in progress aims to developan object-oriented software Toolkit for statistical data analysis. The Toolkit contains a variety of Goodness-of-Fittests, from Chi-squared to Kolmogorov-Smirnov, to less known, but generally much more powerful tests such as Anderson-Darling, Goodman, Fisz-Cramer-vonMises, Kuiper. Thanks to the component-baseddesign and the usage of the standard abstract interfaces for data analysis, this tool can be used by other data analysis systems or integrated in experimental software frameworks. In this paper we describe the statistical details of the algorithms and the computational features of the Toolkit. With the aim of showing the consistency between the code and the mathematical features of the algorithms, we describe the results we obtained reproducing by means of the Toolkit a couple of Goodness-of-Fittesting examples of relevance in statistics literature. |
| 4849 | 2004-06-14 | PICCA - a PIC Demo Board for LabVIEW Courses | 2004 | LNF-04-11(NT).pdf | Marco Cordelli, Agnese Martini, Luciano Trasatti | We have designed and built, with the help of Servizio di Progettazione Elettronica of LNF, a demo board using a PIC 16F876 microcontroller, several peripherals and an RS/232 link intended as a control link with a separate computer running a high level control language, i. e. LabVIEW, with the main purpose of setting up in our LabVIEW courses a working system for data acquisition /controls |
| 4848 | 2004-06-09 | Realizzazione di un Sisema di Movimentazione dei Bersagli per un Laser a 1KHz | 2004 | INFN-TC-04-11.pdf | Antonio Anastasio | Questa nota descrive il sistema sviluppato per la movimentazione di bersagli sotto vuoto, usato per lo studio dei processi di ablazione e di deposizione di film sottili a mezzo laser |
| 4846 | 2004-05-19 | Un Layout piu' Accessibile per il Sito WEB della Sezione di Trieste dell'INFN | 2004 | INFN-TC-04-10.pdf | Claudio Strizzolo | Il layout del sito web della Sezione di Trieste dell'INFN è stato completamente ridisegnato nel gennaio del 2004. Il sito è stato adeguato alle raccomandazioni del World Wide Web Consortium, con l’intenzione di migliorarne in particolare l’accessibilità e la possibilità di riutilizzo dei contenuti. Questo documento descrive le caratteristiche del nuovo layout e presenta alcune considerazioni tecniche emerse nel corso del suo sviluppo. |
| 4840 | 2004-05-06 | Progetto di una Sospensione Meccanica a Bassa Frequenza di Risonanza per Masse Cilindriche | 2004 | LNF-04-10(NT).pdf | M. Bassan L. Quintieri | Lo studio di risonanze meccaniche di particolari strutture ha sempre rivestito una grande importanza negli esperimenti di ricerca di onde gravitazionali: basti pensare alla rilevanza del trasduttore risonante nelle antenne gravitazionali e a quella dei filtri meccanici per l’isolamento sismico di qualunque apparato di rivelazione, sia risonante che interferometrico. In questa nota descriveremo lo studio di un supporto, con geometria particolare, che può essere definita a 'trave ripiegata', finalizzato a sorreggere masse cilindriche. Uno degli obiettivi del lavoro descritto in questa nota consiste nel valutare se questa struttura, già utilizzata in passato per risonatori di bassa frequenza, possa essere impiegata proficuamente per la realizzazione di uno stadio di sospsensione meccanica. I filtri di attenuazione delle vibrazioni sono invariabilmente concepiti sul principio di funzionamento del filtro passa-basso, dove un risonatore meccanico fornisce 6 dB/ottava di attenuazione per frequenze superiori alla propria risonanza. È quindi ovvio cercare di produrre stadi di attenuazione con la più bassa frequenza di risonanza possibile. Poichè sospensioni di bassa frequenza per grandi masse richiedono risonatori di grandi dimensioni, è parso naturale affrontare inizialmente il problema con un modello in scala: per restare nel campo di una progettazione concreta, abbiamo quindi adottato come obiettivo la sospensione di un piccolo cilindro sostenuto per la circonferenza mediana. Applicazione pratica immediata di questo schema è la sospensione di piccoli specchi per i prototipi di interferometri criogenici, dove lo specchio deve essere isolato meccanicamente, ma termicamente ben ancorato al punto freddo dell’apparato. |
| 4839 | 2004-05-06 | Acqua Pesante (D2o) Irradiata: Dal Reattore Nucleare Alla Cellula | 2004 | LNF-04-9(P).pdf | C. Catena, D. Pomponi, G.Trenta, F.Celani, P. Marini, G. De Rossi, E. Righi | Summary: Researches curried out to justify the strong pH variability of D2O utilized to overloading deuterium in palladium and to investigate the reason for the disappearance of mercury dispersed in the electrolytic solution to patch the microslit of palladium wires, leaded us to a discovery of a new bacterial species, we named: Ralstonia detusculanense e Stenotrophomonas detusculanens; they turned out to be responsible of the noticed anomalies. Therefore, to remove these inconveniences, we sterilized the D2O using high doses of gamma radiation. Hall this was a solid justification to start an experimental study to compare the biological effects of D2O not irradiated and irradiated at high doses. This research clearly demonstrated a greater increase of the biological effects due to irradiated with respect to the non irradiated heavy water. This greater effectiveness was evaluated by means of the cell survival reduction and of the apoptosis increase. At the same time the experiment indicates that normal irradiated water loss in time hits efficacy in a greater extent with respect to the heavy irradiated water. Looking at the experimental results the question comes out on what mechanisms could be responsible of the cellular lethal damages at low concentrations of heavy irradiated water. We are pointing out our attention on deuterated free radicals and on the possibility of their implications in some biological structures or processes. A further aspect that came out was the persistence in the long run of the high cytotoxic efficacy of irradiated D2O. This “radiomimetic” behaviour of irradiated D2O is justifying the experimental extension to the molecular compounds produced by irradiation (ROS or/and other molecules); we intend reach this aim through chemical-physical methodologies and, at the same time, we hope also to obtain useful indications on cellular interaction mechanisms involved in the specific field of cancer cell lethality. |
| 4838 | 2004-04-30 | Annual Report 2003 | 2004 | LNF-04-8(IR).pdf | AA.VV. | |
| 4837 | 2004-04-28 | Cloud Radar : Radar Airborne per Misure in Nube. Note di Calcolo sul Sistema di Puntamento | 2004 | INFN-TC-04-9.pdf | Progetto: V. Carassiti, F. Evangelisti Calcoli struttura e azionamenti: V. Carassiti Disegni: F. Evangelisti Installazione degli azionamenti : M. Furini, L. Landi, M. Melchiorri, S. Squerzanti Comandi e controlli degli azionamenti : R. Malaguti, S. Mantovani, C. Pennini | E’ stato realizzato un sistema di movimentazione per il puntamento del cloud radar, uno strumento che utilizza l’effetto doppler per analizzare ostacoli metereologici. Una parabola trasmittente ed una ricevente analizzano una porzione di spazio nella direzione dell’ostacolo da analizzare. La movimentazione della struttura di alloggiamento delle parabole è ottenuta con due assi controllati. Il cloud radar è di proprietà dell’Agenzia Spaziale Italiana (ASI) che ne ha finanziato il progetto. La seguente nota descrive il calcolo del sistema di puntamento. |
| 4841 | 2004-04-14 | Precision Validation of Geant4 Electromagnetic Physics | 2004 | INFN-AE-04-2.pdf | G.A.P. Cirrone, G. Cuttone, S. Donadio, V. Grischine, S. Guatelli, P. Gumplinger, V. Ivanchenko, M.Maire, A. Mantero, B. Mascialino, P. Nieminen, L. Pandola, S. Parlati, A. Pfeiffer, M.G. Pia, L. Urban | The Geant4 toolkit provides an ample set of physics models for electromagnetic interactions. Results from a series of detailed tests with respect to well established reference data sources and experiments are presented, focusing on the precision validation of cross sections and angular distributions of various alternative physics models available in Geant4. Such precision tests are especially relevant for critical applications of simulation models, such as tracking detectors, calorimetry, neutrino and other astroparticle experiments, medical physics. |
| 4842 | 2004-04-14 | A Software Toolkit For Statistical Data Analysis | 2004 | INFN-AE-04-3.pdf | S. Donadio, S. Guatelli, B. Mascialino, A. Pfeiffer, M.G. Pia, A. Ribon, P. Viarengo | We present a project in progress to develop a software toolkit for statistical data analysis. The toolkit is based on advanced software technologies, integrating generic programming techniques with object oriented methods, and adopts a rigorous software process, to ensure a high quality of the product. Thanks to the component-based architecture and the usage of the standard AIDA interfaces, this tool can be easily used by other data analysis systems or integrated in experimental frameworks. The initial component of the system addresses goodness of fittests; its applications include the comparisons of data distributions in a variety of use cases typical of HEP experiments: regression testing (invarious phases of the software life-cycle), validation of simulation through comparison to experimental data, comparison of expected versus reconstructed distributions, comparison of different experimental distributions - or of experimental with respect to theoretical ones -in physics analysis, monitoring detector behavior with respect to a reference in online DAQ. The system will provide the user the option to choose among a wide set of goodness-of-fit tests (chi-squared, Kolmogorov-Smirnov, Anderson-Darling, Lilliefors, Kuiper, Cramer-vonMises, etc.), specialised for various types of binned and unbinned distributions. Its flexible design makes it open to further extension to implement other tests. This system would represent a significant improvement with respect to the current availability of comparison tests in HEP libraries, limited to the chi-squared and Kolmogorov-Smirnov algorithms. We present the architecture of the toolkit, the detailed design of the basic statistical testing component and preliminary results of its application, in particular concerning the physics validation of the Geant4 Simulation Toolkit. We discuss the openness of the project, welcoming contributions from experts and userrequirements from experiments. |
| 4843 | 2004-04-14 | Overview of Geant4 Application In Medical Physics | 2004 | INFN-AE-04-4.pdf | L. Beaulieu, J.F. Carrier, F. Castrovillari, S. Chauvie, F. Foppiano, G. Ghiso, S. Guatelli, S. Incerti, E. Lamanna, S. Larsson, M.C. Lopes, L. Peralta, M.G. Pia, M. Piergentili, P. Rodrigues, V.H. Tremblay, A. Trindade | We present a series of achievements associated with Geant4-based applications in medical physics and, in particular, in radiotherapy (external beams and brachytherapy), protontherapy, PEM, PET, MRT, metabolic therapy, IORT; projects in microdosimetry and radiobiology are beginning. The Geant4 CT-interface allows to reproduce realistically the patient anatomy, the integration to the GRID allows to run the applications sharing distributed computing resources. The Geant4 Medical Physics Group has born from the collaboration of Geant4 with several research and medical physics institutes in Europe. |
| 4844 | 2004-04-14 | Code-Testing of Statistical Test Implementations | 2004 | INFN-AE-04-5.pdf | P. Cirrone, S. Donadio, S. Guatelli, A. Mantero, B. Mascialino, L. Pandola, S. Parlati, M.G. Pia, P. Viarengo, F. James, A. Pfeiffer, A. Ribon | In this note we discuss in general how to test the implementation code of statistical tests, and then we treat in detail the case of the Kolmogorov-Smirnov test. It will be shown that some 'obvious' expected properties, like the flatness distributions of p-values from repeating drawings from the same parent distribution, are not indeed reproduced even in absence of bugs in the code, due to either asymptotic approximations in the formulas used to compute the p-value, or to the discreteness of the distance distribution in the case of direct Monte Carlo evaluation of the p-value. This makes the code-testing more complicated. Some practical advice is presented anyhow. |
| 4845 | 2004-04-14 | From Dicom Togrid: A Dosimetric System For Brachytherapy Born From Hep | 2004 | INFN-AE-04-6.pdf | Franca Foppiano, Susanna Guatelli, Jakub Moscicki , Maria Grazia Pia, Michela Piergentili | In brachytherapy software defines the experimental configuration of radioactive seeds appropriate to achieve the desired dose distribution in the patient.We will show you how nowadays it is possible to develop a software for brachytherapy which achieves the goal of high accuracyand speed thanks to the combination of various software toolkits: Geant4 simulation toolkit, AIDA analysis toolkit, GRID and the web. Geant4-based brachytherapy application calculates dose distribution in tissues with great accuracy, in a realistic experimental set-up derivedfrom CT data. The AIDAanalysis toolkit provides the elaboration of simulation results. It is possible to run Geant4-based brachytherapy application through a web portal, sharing distributed computing resources thanks to the integration in the GRID, making possible even to modest size hospitals to profit of advanced treatment planning tools. |
| 4847 | 2004-04-14 | Data Analysis in Hep: A Statistical Toolkit | 2004 | INFN-AE-04-7.pdf | Stefania Donadio, Susanna Guatelli, Barbara Mascialino, Andreas Pfeiffer, Maria Grazia Pia, Alberto Ribon, Paolo Viarengo | Statistical methods play a significant role through out the life-cycle of HEP experiments, being an essential component of physics analysis. Only a few basic tools for statistical analysis were available in the public domain FORTRAN libraries for HEP. Nowadays the situation is hardly unchanged even among the libraries of the new generation. The present project in progress aims to develop an object-oriented software toolkit for statistical data analysis. More in particular, the Statistical Comparison component of the toolkit provides algorithms for the comparison of data distributions in a variety of use cases typical of HEP experiments, as regression testing (in various phases of the software life-cycle), validation of simulation through comparison to experimental data, comparison of expected versus reconstructed distributions, comparison of data from different sources - such as different sets of experimental data, or experimental with respect to theoretical distributions. The toolkit contains a variety of goodness-of-fittests, from chi-squared to Kolmogorov-Smirnov, tolessknown, but generally much more powerful tests such as Anderson-Darling, Lilliefors, Cramer-vonMises, Kuiper. Thanks to the component based design and the usage of the standard AIDA interfaces, this tool can be used by other data analysis systems orintegrated in experimental software frameworks. We present the architecture of the system, the statistics methods implemented and the results of its first applications to the validation of the Geant4 Simulation Toolkit and to experimental data analysis. |
| 4836 | 2004-04-14 | Realizzazione di un Web Server Sicuro con User Mode Linux | 2004 | INFN-TC-04-8.pdf | Domenico Diacono, Giacinto Donvito | La realizzazione di un Web server è sempre più spesso necessaria nella attività di ricerca per permettere la condivisione rapida di informazioni. La diffusione capillare dell’accesso alla rete e il conseguente aumento dei casi di propagazione di virus e worm che sfruttano vulnerabilità nei server impone una forte attenzione alla sicurezza. In questo studio si propone l’uso di una distribuzione GNU/Linux poco diffusa, Gentoo-Linux, all’interno della quale mediante la modifica del kernel User Mode Linux attivare un server virtuale completamente separato dalla macchina ospite. In questo modo una eventuale compromissione attraverso i servizi Web della macchina virtuale avrà scarse probabilità di raggiungere la macchina principale. |
| 4834 | 2004-04-02 | Detection of Turn-to-turn Insulation Failures in the Toroidal ATLAS Coils after Cold Mass Assembling | 2004 | INFN-TC-04-6.pdf | E. Acerbi, G. Baccaglioni, G. Cartegni, M. Sorbi, G. Volpini | |
| 4835 | 2004-04-02 | Nbn: A Fast, Low Cost, Mini Data Acquisition System for Nuclear Physics | 2004 | INFN-TC-04-7.pdf | Antonio Ordine | A multiparametric data acquisition system, based on VME system and Macintosh desktop computer, has been developed as an evolution towards smaller size (few tens of raw parameters) nuclear physics experiments of an acquisition system implemented for heavy ion induced nuclear reactions (few hundreds of parameters and high counting rates) using VME, CAMAC-FERA modules and middle size Work-Station (as Digital alpha station and/or HP WS). The system acquires data from VME ADCs, processes and stores them on a SCSI storage media (EXABYTE or DLT unit). The block diagram and the main features of the system and its friendly user interface will be described. |
| 4832 | 2004-03-29 | Neutrino Oscillation Studies with Laser-Driven Beam Dump Facilitis | 2004 | LNF-04-7(IR).pdf | S.V.Bulanov, T.Esirkepov, P.Migliozzi, F.Pegoraro, T.Tajima, F.Terranova | A new mechanism is suggested for efficient proton acceleration in the GeV energy range; applications to non-conventional high intensity proton drivers and, hence, to low-energy (10-200~MeV) neutrino sources are discussed. In particular we investigate possible uses to explore subdominant $\\bar{\\nu}_\\mu \\rightarrow \\bar{\\nu}_e$ oscillations at the atmospheric scale and their CP conjugate. We emphasize the opportunity to develop these facilities in conjunction with projects for inertial confined nuclear fusion and neutron spallation sources. |
| 4833 | 2004-03-25 | Study of a Pure Object Programming Language for Reliable System Development | 2004 | INFN-TC-04-5.pdf | Matteo Sassi | In nuclear physics the use of object oriented programming languages is continuously growing. Object programming is used in the development of data analysis frameworks such as ROOT from CERN and the SMI++ one used by DELPHI experiment. The object programming languages allow a rapid and flexible development of the data analysis software and acquisition control code, and a reduction of development and maintenance costs, because each system is viewed as a collection of objects. However the use of object oriented programming in the development of dependable systems introduces the reliability problem. To solve this problem a Pure Object Language Core (POLC) has been studied, based on the formal theory of the objects. In the present work this study is discussed. An example of application based on an optimum digital filter for gamma high resolution spectroscopy is presented. |
| 4829 | 2004-03-24 | Progetto e Realizzazione di un Manipolatore Micrometrico a sei Gradi di Liberta' per Spettroscopia a Bassa Temperatura in Alto Vuoto ---- Project and Manufacturing of a high-vacuum, six-axes Micromanipulator for Low Temperature spectroscopy | 2004 | LNF-04-6(IR).pdf | A. Marcelli, G. Cibin and A. Raco | Nell'ambito del progetto {\\em{CryoAlp}} \\`{e} stato sviluppato e collaudato un sistema di movimentazione micrometrica a sei gradi di libert\\`{a} progettato per esperimenti di microscopia e spettroscopia in alto vuoto. Le caratteristiche di questo sistema micrometrico, dimensioni compatte, ampio campo operativo unito ad alta precisione, possibilit\\`{a} di eseguire mappature di superfici con geometrie complesse, compatibilit\\`{a} con ambiente di alto vuoto, temperature di esercizio fino a {-50} $^o$C, rendono questo sistema unico nel suo genere per esperimenti non convenzionali su campioni con superfici irregolari, in condizioni di temperatura controllata in vuoto. In the framework of the {\\em{CryoAlp}} project we developed and tested a micro-positioning system with six degrees of freedom devoted to spectromicroscopy experiments in a high-vacuum regime. The characteristics of this micrometric system: compactness, wide operating range combined to a high precision, capability to perform mapping of sample surfaces with complex geometries, compatibility with high-vacuum, operating temperatures down to {-50} $^o$C - make this system a unique system, tailored to specific requirements of non conventional experiments, such as those looking at samples with non homogeneous surfaces, in a controlled temperature regime in vacuum. |
| 4828 | 2004-03-23 | Study of Tensile Response of Kapton and Mylar Strips to AR and CO2 Mixtures for the BteV Straw Tube Detector | 2004 | LNF-04-5(P).pdf | E.Basile F. Bellucci M.Bertani S.Bianco M.A.Caponero F. Di Falco F.L.Fabbri F.Felli M.Giardoni A. La Monaca G.Mensitieri B.Ortenzi M.Pallotta A.Paolozzi L.Passamonti D.Pierluigi A.Russo S.Tomassin | Gas mixtures are known to affect mechanical properties of plastic materials of interest in HEP gas detectors. We have studied tensile properties of several materials for use in the straw tube detector of experiment BteV at the Fermilab Tevatron. A straw tube is a complex structure made up of two different layers of polymeric material with aluminium deposition and glue, therefore we have decoupled all these elements to better understand gas effect on each one. We have tested four different gas mixtures of Ar and CO2 on several strips of kapton and mylar loaded at about 200g (typical tension for straw tubes in BTeV). We have also considered temperature, pressure and relative humidity effects on strips mechanical tension. |
| 4831 | 2004-03-19 | Comparison of ECR Ion Source Performance for Different Microwave Generators | 2004 | INFN-TC-04-4.pdf | A. Galata', L. Ciavola, F. Consoli, S. Gammino, S. Marletta | A complete set of measurements ha been carried out in order to confirm the performances enhancement, previously observed in SERSE source when the cavity is fed by means of a TWT generator instead of a Klystron generator, which ha been commonly used. It was observed that higher extracted currents are produced for higher charge states by using TWT at 14 GHz, while higher extracted currents for every charge state wer ,e obtained when the microwaves at 18 GHz are provided to the source. A description of experimental set-up and of the results obtained are given next. The comparison of data will be analysed and an explanation in terms of the current model of ECRIS plasma will be proposed. |
| 4827 | 2004-03-19 | Infrared Spectra Normalization at SINBAD | 2004 | LNF-04-4(IR).pdf | M. Cestelli Guidi, A. Marcelli, A. Nucara and P. Calvani | In the long wavelength region the Synchrotron Radiation emission has peculiar properties. However, the Infra Red Synchrotron Radiation flux is linearly dependent on the beam current I. At DAFNE, an e+- e- collider, because of the short beam lifetime, infrared data acquisition performed using a Fourier Transform Infrared spectrometer is strongly affected by this dependence, which has to be corrected by post-acquisition normalization. Here is presented NORMA©, an original software package developed using OPUS® macros and VB scripts, which automates this procedure for data acquisition using both the interferometer and the microscope. |
| 4825 | 2004-03-18 | Supporting the Development Process of the DataGrid Workload Management System Software with GNU autotools, CVS and RPM | 2004 | INFN-TC-04-2.pdf | G. Avellino, S. Beco, B. Cantalupo, A. Maraschini, F. Pacini, S. Monforte, M. Pappalardo, D. Kouril, A. Krenek, Z. Kabela, L. Matyska, M. Mulac, J. Pospisil, M. Ruda, Z. Salvet, J. Sitera, M. Vocu, F. Giacomini, E. Ronchieri, A. Gianelle, R. Peluso, M. Sgaravatto, M. Mezzadri, F. Prelz, A. Guarise, R. Piro, A. Werbrouck, D. Colling | DataGrid is project funded by the European Commission to develop and deploy distributed computing components for reference applications in the domains of Particle Physics, Earth Observation and Bioinformatics. The software development is shared among nine contractual partners, in seven different countries, and is organized in work-packages covering different areas. In this paper, we discuss how combination of Concurrent Version System, GNU autotools and other tools and practices was organised to allow the development, build, test and distribution of the DataGrid Workload Management Sys-tem. This is the product of one speci_c work-package that is not only characterised by rather high internal geographic and administrative dispersion (four institutions with de-velopers at nine different locations in three countries), but by the fact we had to integrate and interface to dozen of third-party code packages coming from different sources, and to the software products coming from other three development work-packages internal to the project. high level of central co-ordination needed to be maintained for project-wide steering, and this had also to be re_ected in the software development infrastructure, while maintaining ease-of-use for distributed developers and automated procedures wherever possible. |
| 4826 | 2004-03-18 | Una Struttura di Autenticazione Centralizzata per Diversi Gruppi di Sistemi LINUX, Realizzata con NIS e ISPEC | 2004 | INFN-TC-04-3.pdf | Tullio Macorini, Claudio Strizzolo, Lucio Strizzolo | Il presente documento descrive una struttura di autenticazione centralizzata per sistemi Linux, che consente di gestire l’accesso a diversi insiemi di macchine da parte di gruppi distinti di utenti. La struttura in oggetto è in produzione per il riconoscimento degli utenti su vari sistemi di calcolo della Sezione di Trieste, dislocati in siti geografici differenti. L’architettura è stata realizzata per mezzo di un unico dominio NIS, impiegando alcune funzionalità particolari offerte dai moduli di autenticazione di Linux, e utilizzando il protocollo IPsec per garantire la sicurezza delle comunicazioni tra i server NIS. Il documento presenta le caratteristiche principali della struttura ed alcune modalità operative per la sua realizzazione. |
| 4824 | 2004-02-17 | PolyCAD: A New X-Ray Tracing Code for Cylindrical Polycapillary Optic | 2004 | LNF-04-3(IR).pdf | D. Hampai, S.B. Dabagov, and G. Cappuccio | A new CAD program designed for X-ray photon tracing in polycapillary optics is described. As starting approach the simplest case of cylindrical polycapillary optics is presented. The PolyCAD allows any type of X-ray source such as an X-ray tube of finite beam dimensions as well as an astrophysical object in combination with polycapillary optical samples to be simulated. Using geometrical optics approximation the program was drawn up by a code for two different sources: a point-source and an X-ray tube. The radiation distributions formed by the cylindrical lens on a screen located at various distances are discussed. The agreement with the results earlier published validates the PolyCAD results. |
| 4823 | 2004-02-05 | A Shaper for Providing Long Laser Waveforms | 2004 | INFN-BE-04-1.pdf | Simone Cialdi, Ilario Boscolo | We discuss the features of a shaping device consisting of a spectral amplitude modulator followed by a pair of diffraction gratings arranged as a linear dispersive stretcher. The system is proposed in view of transforming input short pulses into much longer target pulses. The shaper transfers a spectral amplitude profile into a temporal profile. The device is interesting for its mechanical simplicity, its stability to perturbations of input pulse parameters and optical apparatus alignment and finally for its capability to provide long rectangular pulses with fast rise time as required by radiofrequency electron guns. |
| 4820 | 2004-01-16 | A Proposal For Cosmic Ray Studies Involving Collaborations Between Higher Education, Research Sites and Local Area High Schools | 2004 | INFN-AE-04-1.pdf | Barbara Famoso Francesco Riggi | This is a proposal for a collaboration between the INFN, the Department of Physics and Astronomy of the University of Catania, and local area high schools, aimed at carrying out experimental studies in cosmic ray physics. The purpose of the collaboration is to investigate the possible involvement of high schools sites in studies related to nuclear and high energy experimental physics, and the educational aspects of such involvement. According to the idea outlined in the present proposal, the INFN/University Department site will act as a central data collection and processing institution, managing an array of scintillator-based detectors. Each high school joining the project could handle its own detector for cosmic muons, with the overall set of detectors resulting in a large array allowing the study of both local properties of the cosmic muon flux and large area correlations as well. A basic introduction to the different physics items which could be investigated in this framework is given in the present document, together with some technical aspects on how to carry out such measurements. The role of the educational aspects of the proposal is also stressed. |
| 4819 | 2004-01-13 | Observation of Local Chiral-Symmetry Breaking in Globally Centrosymmetric Crystals | 2004 | LNF-04-2(P).pdf | S. Di Matteo, Y. Joly, A. Bombardi, L. Paolasini, F. de Bergevin, and C. R. Natoli | A thorough tensor analysis of the Bragg-forbidden reflection (00:3)h in corundum systems having a global center of inversion, such as V2O3 and a-Fe2O3, shows that anomalous x-ray resonant diffraction can access chiral properties related to the dipole-quadrupole (E1-E2) channel via an interference with the pure quadrupole-quadrupole (E2-E2) process. This is also confirmed by independent ab initio numerical simulations. In such a way, it becomes possible to detect chiral quantities in systems where dichroic absorption techniques are ineffective. |
| 4818 | 2004-01-12 | Il Ciclo di Costruzione della Target Cell del Recoil Detector dell’Esperimento HERMES | 2004 | INFN-TC-04-1.pdf | V. Carassiti, F. Evangelisti, M. Furini, L. Landi, M. Melchiorri, S. Squerzanti G. Ciullo, P. Ferretti-Dalpiaz, P. Lenisa | E’ stata realizzata una target cell per il recoil detector dell’esperimento Hermes presso il laboratorio Desy di Amburgo (D) . L’esperimento è sul fascio dell’anello di accumulazione Hera ed il suo scopo è di investigare la struttura di spin del protone tramite scattering profondamente inelastico leptone-nucleone. Le parti principali che compongono il recoil detector sono: un detector al silicio attorno alla target cell sotto vuoto, un tracker a fibre scintillanti immerso in un campo magnetico longitudinale di 1 Tesla ed un detector per fotoni costituito da alcuni strati di scintillatori. La presente nota tecnica descrive le procedure di costruzione ed assemblaggio delle parti costituenti la target cell. |
| 4821 | 2003-12-18 | Measurement of Masses and Widths of Excited Charm Mesons D_2 and Evidence for Broad States | 2003 | LNF-03-22(P).pdf | J. M. Link, P. M. Yager, J. C. Anjos, I. Bediaga, C. Gobel, A. A. Machado, J. Magnin, A. Massafferri, J. M. de Miranda I. M. Pepe E. Polycarpo, A. C. dos Reis, S. Carrillo, E. Casimiro, E. Cuautle A. Sanchez-Hernandez, C. Uribe, F. Vazque, L. Agostino, L. Cinquini, J. P. Cumalat, B. O'Reilly, I. Segoni, M. Wahl, J. N. Butler, H. W. K. Cheung, G. Chiodini, I. Gaines, P. H. Garbincius, L. A. Garren, E. Gottschalk, P. H. Kasper, A. E. Kreymer, R. Kutschke, M. Wang, L. Benussi, M. Bertani, S. Bianco, F. L. Fabbri, A. Zallo, M. Reyes, C. Cawlfield, D. Y. Kim, A. Rahimi, J. Wiss, R. Gardner, A. Kryemadhi, Y. S. Chung, J. S. Kang, B. R. Ko, J. W. Kwak, K. B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, M. Boschini, A. Cerutti, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, M. Giammarchi P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T. F. Davenport III, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M. M. Merlo, D. Pantea, D. Lopes Pegna, S. P. Ratti, C. Riccardi, P. Vitulo, H. Hernandez, A. M. Lopez, E. Luiggi, H. Mendez, A. Paris, J. E. Ramirez, Y. Zhang, J. R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W. E. Johns, M. Nehring, P. D. Sheldon, K. Stenson, E. W. Vaandering, M. Webster, M. Sheaff | Using data from the FOCUS experiment we analyze the $D^+\\pi^-$ and $D0\\pi^+$ invariant mass distributions. We measure the $D_2^{*0}$ mass $M_{D_2^{*0}} = (2464.5 \\pm 1.1 \\pm 1.9) \\mev$ and width $\\Gamma_{D_2^{*0}} = (38.7 \\pm 5.3 \\pm 2.9) \\mev$, and the $D_2^{*+}$ mass $ M_{D_2^{*+}} = (2467.6 \\pm 1.5 \\pm 0.76) \\mev$ and width $ \\Gamma_{D_2^{*+}} = (34.1 \\pm 6.5 \\pm 4.2) \\mev$. We find evidence for broad structures over background in both the neutral and charged final state. If each is interpreted as evidence for a single $L=1$, $j_q=1/2$ excited charm meson resonance, the masses and widths are $M_{1/2}^0 =(2407 \\pm 21 \\pm 35 ) \\mev$, $\\Gamma_{1/2}^0 = (240 \\pm 55 \\pm 59) \\mev$, and $M_{1/2}^+ = (2403 \\pm 14 \\pm 35 ) \\mev$ $\\Gamma_{1/2}^+ = (283 \\pm 24 \\pm 34 ) \\mev$, respectively |
| 4822 | 2003-12-18 | First results from the FINUDA Experiment at DA$\\Phi$NE | 2003 | LNF-03-23(P).pdf | M. Agnello, G. Beer, L. Benussi, M. Bertani, S. Bianco, E. Botta, T. Bressani, L. Busso, D. Calvo, P. Camerini, P. Cerello, B. Dalena, F. De Mori, G. D'Erasmo, D. Di Santo, F.L. Fabbri, D. Faso, A. Feliciello, A. Filippi, V. Filippini, E.M. Fiore, H. Fujioka, P. Gianotti, N. Grion, A. Krasnoperov, V. Lucherini, S. Marcello, T. Maruta, N. Mirfakhrai, O. Morra, A. Olin, E. Pace, M. Palomba, A. Pantaleo, A. Panzarasa, V. Paticchio, S. Piano, F. Pompili, R. Rui, G. Simonetti, H. So, S. Tomassini, R. Wheadon, A. Zenoni | In spring 2003 the FINUDA detector was installed at the $\\phi$ factory DA$\\Phi$NE in the Laboratori Nazionali di Frascati of INFN (Italy). In October 2003 the commissioning of the apparatus was accomplished and the first data taking started with a set of nuclear targets $^6Li$, $^7Li$, $^{12}C$, $^{27}Al$, $^{51}V$. The data collection will continue until a total integrated luminosity of 250 pb$^{-1}$ is recorded. Light and medium A hypernuclei will be abundantly produced by the strangeness exchange reaction induced by the stopped K$^-$ coming from the decay of $\\phi(1020)$ mesons. The aim of the experiment is to simultaneously measure the excitation energy spectra of the produced hypernuclei, with a resolution better than 1~MeV, the lifetime of the $\\Lambda$ embedded in the different hypernuclei and the partial widths $\\Gamma_\\pi$, $\\Gamma_{np}$ and $\\Gamma_{nn}$ for mesonic and non mesonic hypernuclear decays. Information on neutron-rich hypernuclei and rare hypernuclear two-body decays might be available too, with the statistics that will be collected at the end of the run. In the present paper, first results concerning in-beam detector calibration, spectrometer performances and very preliminary hypernuclear formation and decay spectra will be presented. |
| 4815 | 2003-12-12 | Sistemi Storage su Disco Utilizzati al TIER1 CNAF | 2003 | INFN-TC-03-19.pdf | Ricci Pier Paolo, Stefano Zani | Il presente articolo si presenta come una descrizione introduttiva dei vari apparati di stoccaggio dati su disco attualmente in produzione all'INFN TIER1 presso il CNAF di Bologna. Per ogni apparato è presente sia una descrizione tecnica dell'hardware sia una serie di note sul sistema software di management,configurazione e monitoraggio. Inoltre sono stati riportati per ogni apparato una serie preliminare puramente indicativa di risultati di performance di accesso sequenziale al disco oltre ad una descrizione generale del sistema di storage disco del TIER1 visto nella sua globalità. |
| 4816 | 2003-12-12 | Thermal and Isotopic Anomalies when Pd Cathodes are Electrolyzed in Electrolytes Containing Th-Hg Salts Dissolved at Micromolar Concentration in C2H5OD/D2O Mixtures | 2003 | LNF-03-21(P).pdf | F. Celani, A. Spallone, E. Righi, G. Trenta, C. Catena, G. D’agostaro, P. Quercia, V. Andreassi, P. Marini, V. Di Stefano, M. Nakamura, A. Mancini, P.G. Sona, F. Fontana, L. Gamberale, D. Garbelli, F. Falcioni, M. Marchesini, E. Novaro, U. Mastromatteo | Discussed in this paper is the evolution of work that started, since March 1989, by using the M. Fleischmann and S. Pons method and ended by using thin palladium wires electrolyzed in an electrolyte consisting of slightly acidic heavy alcohol-water solution containing thorium (Th) and mercury (Hg) salts at micromolar concentrations. The resulting large and dynamic loading of the Pd wires was studied. The recent use of thorium instead of strontium resulted in thermal anomalies and detection of new elements in larger amounts. The results with Sr are qualitatively in agreement with what was found by Y. Iwamura (Mitsubishi Heavy Industries, Yokohama-Japan) using multilayers of Pd-CaO-Pd-Sr in flowing deuterium gas. Most results seem to be in agreement with a “multi-body resonance fusion of deuterons” model recently developed by A.Takahashi (Osaka University-Japan). |
| 4814 | 2003-12-11 | Condor and the Bologna Batch System | 2003 | INFN-TC-03-18.pdf | Peter Couvares, Paolo Mazzanti, Daniela Bortolotti, Franco Semeria | A very simple batch system for UNIX Linux machines, based on Condor software is presented. This system may be very useful for managing farms and is very customizable and flexible. It has been extensively tested on a dedicated farm in INFN Bologna. |
| 4813 | 2003-12-04 | Studio Preliminare di VPN per l’INFN | 2003 | INFN-TC-03-17.pdf | Ombretta Pinazza, Alessandro Brunengo, Enrico M.V. Fasanelli, Enrico Mazzoni, Claudio Soprano, Riccardo Veraldi, Stefano Zani | Le Virtual Private Networks sono nate allo scopo di trasportare traffico privato su una rete pubblica in maniera sicura e autenticata. L’introduzione delle VPN nel nostro Ente potrebbe rappresentare uno strumento per aumentare il livello di sicurezza nelle comunicazioni fra le unità operative decentrate e per agevolare i ricercatori che si spostano sempre più di frequente fra le sedi, i laboratori italiani o stranieri e coloro che lavorano da casa. Il Netgroup ha promosso questo studio preliminare per fornire ai Servizi di Calcolo e Reti uno strumento di partenza per la scelta di tecnologie emergenti necessarie a una tipologia di lavoro sempre più mobile e dinamica. |
| 4812 | 2003-11-20 | The 5 MeV Electron Linac for Radiation Processing in Messina | 2003 | INFN-TC-03-16.pdf | L. Auditore, R.C. Barnà, D. De Pasquale, A. Italiano, A. Trifirò, M. Trimarchi | Several modern applications of radiation processing require compact and self-contained electron accelerators. To match these requirements, a 5 MeV, 1 kW electron linac has been developed at the Dipartimento di Fisica (Università di Messina), and will be described in this paper. This standing wave accelerator, driven by a 3 GHz, 2.5 MW Magnetron generator, has an autofocusing structure, and will be used to study several applications of radiation processing. |
| 4804 | 2003-11-17 | Photon Total Cross-Sections | 2003 | LNF-03-20(P).pdf | R.M. Godbole A. Grau G. Pancheri and Y.N. Srivastava | We discuss present predictions for the total $\\gamma \\gamma$ and $\\gamma p $ cross-sections, highlighting why predictions differ. We present results from the Eikonal Minijet Model and improved predictions based on soft gluon resummation. |
| 4802 | 2003-11-14 | Progetto CONDOR: Installazione Automatica del Software | 2003 | INFN-TC-03-15.pdf | Daniela Bortolotti, Paolo Mazzanti, Franco Semeria | Viene descritta una semplice realizzazione di un tool di installazione, basato su web, del software Condor particolarmente adattato alle esigenze di base per il Condor Pool INFN su WAN. Tale procedura viene incontro a necessita’ da tempo espresse dalla comunita’ INFN associata ai problemi di calcolo. In sostanza si e’ detto che una delle ragioni della staticita’ del pool stesso per quanto riguarda il numero delle macchine che lo compongono, e’ dovuta ad oggettive difficolta’ dovute alla installazione di base, ossia quella fornita con il software. La nostra speranza e’ che questo metodo di installazione permetta effettivamente di aggiungere macchine al Condor Pool Nazionale e cosi’ servire meglio e meglio ottimizzare le risorse di calcolo. Per questi motivi e’ stato volutamente mantenuto a livelli di estrema semplicita’ di uso, ma, speriamo, di ragionevole efficacia per le necessita’ dell’INFN. Puo’ facilmente essere esteso, se la comunita’ scientifica lo richiedera’. |
| 4803 | 2003-11-14 | The HARP TOF-WALL ELECTRONICS and TRIGGER LOGIC | 2003 | INFN-AE-03-6.pdf | G. Barichello, A. De Min, D. Gibin, A. Guglielmi, M. Laveder, A. Menegolli, M. Mezzetto | In this note the HARP TOF-WALL electronic system is described. The TOF-WALL system adopted as a time digitizer the TDC CAEN V775, which was expressly designed and tested in collaboration with INFN TOF HARP groups. The measurements of TDC linearity, crosstalk and thermal drift, show a very good performance. Details of the behavior of re-designed discriminators and new-designed line receivers are also given. Finally, the TOF-WALL trigger logic is described, in particular the implementation of the local triggers foreseen specifically for the needs of the TOF-WALL |
| 4801 | 2003-11-03 | Monte Carlo Simulation of the SPS WANF Neutrino Flux | 2003 | INFN-AE-03-5.pdf | G. Collazuol and A. Guglielmi | The method developed for the calculation of the West Area Neutrino Beam used by NOMAD at the CERN SPS for the $\\nu_{\\mu} \\rightarrow \\nu_{\\tau}$ and $\\nu_{\\mu} \\rightarrow \\nu_e$ oscillation searches is described. The calculation is based on particle production computed using a recent version of FLUKA suitably tuned to SPY and NA20 results on hadron production. The neutrino fluxes were predicted with an uncertainty of about $ 8 \\%$ for $\\nu_{\\mu}$ and $\\nu_e$, $10 \\%$ for $\\overline{\\nu}_{\\mu}$, and $12 \\%$ for $\\overline{\\nu}_e$. The energy-dependent uncertainty achieved on the $\\nu_e/\\nu_{\\mu}$ ratio ranged from 4 to $7 \\%$ whereas its normalization uncertainty was $4.2 \\%$. |
| 4800 | 2003-10-27 | Peak Finding Through Scan Statistics | 2003 | LNF-03-19(P).pdf | F. Terranova | We discuss the conditions under which Scan Statistics can be fruitfully implemented to signal a departure from the underlying probability model that describes the experimental data. It is shown that local perturbations (``bumps'' or ``excesses'' of events) are better dealt within this framework and, in general, tests based on these statistics provide a powerful and unbiased alternative to the traditional techniques related with the $\\chi^2$ and Kolmogorov distributions. Approximate formulas for the computation of Scan Statistics in the range of interest for high energy and nuclear physics applications are also presented. |
| 4792 | 2003-10-20 | On the Narrow dip Structure at 1.9~GeV/c$^2$ in Diffractive Photoproduction | 2003 | LNF-03-18(P).pdf | P.L.~Frabetti, H.W.K.~Cheung, J.P.~Cumalat, C.~Dallapiccola, J.F.~Ginkel, W.E.~Johns, M.S.~Nehring, E.W.~Vaandering, J.N.~Butler, S.~Cihangir, I.~Gaines, P.H.~Garbincius, L.~Garren, S.A.~Gourlay, D.J.~Harding, P.~Kasper, A.~Kreymer, P.~Lebrun, S.~Shukla, M.~Vittone, R.~Baldini-Ferroli, L.~Benussi, \\, M.~Bertani, S.~Bianco, F.L.~Fabbri, S.~Pacetti, A.~Zallo, C.~Cawlfield, R.~Culbertson, R.W.~Gardner, E.~Gottschalk, R.~Greene, K.~Park, A.~Rahimi, J.~Wiss, G.~Alimonti, G.~Bellini, M.~Boschini, D.~Brambilla, B.~Caccianiga, L.~Cinquini, M.~DiCorato, P.~Dini, M.~Giammarchi, P.~Inzani, F.~Leveraro, S.~Malvezzi, D.~Menasce, E.~Meroni, L.~Milazzo, L.~Moroni, D.~Pedrini, L.~Perasso, F.~Prelz, A.~Sala, S.~Sala, D.~Torretta, D.~Buchholz, D.~Claes, B.~Gobbi, B.~O'Reilly, J.M.~Bishop, N.M.~Cason, C.J.~Kennedy, G.N.~Kim, T.F.~Lin, D.L.~Puseljic, R.C.~Ruchti, W.D.~Shephard, J.A.~Swiatek, Z.Y.~Wu, V.~Arena, G.~Boca, G.~Bonomi, C.~Castoldi, G.~Gianini, M.~Merlo, S.P.~Ratti, C.~Riccardi, L.~Viola, P.~Vitulo, A.M.~Lopez, L.~Mendez, A.~Mirles, E.~Montiel, D.~Olaya, J.E.~Ramirez, C.~Rivera, Y.~Zhang, J.M.~Link, V.S.~Paolone, P.M.~Yager, J.R.~Wilson, J.~Cao, M.~Hosack, P.D.~Sheldon, F.~Davenport, K.~Cho, K.~Danyo, T.~Handler, B.G.~Cheon, Y.S.~Chung, J.S.~Kang, K.Y.~Kim, K.B.~Lee, S.S.~Myung | The narrow dip observed at 1.9~GeV/c$^2$ by the Fermilab experiment E687 in diffractive photoproduction of $~3\\pi^+3\\pi^-$ is examined. The E687 data are refitted, a mechanism is proposed to explain why this resonance appears as a dip, and possible interpretations are discussed. |
| 4781 | 2003-10-07 | The Study of the Noise of Silicon JFET Transistors in a Wide Temperature Range | 2003 | INFN-TC-03-14.pdf | C. Arnaboldi, A. Fascilla, Mark W. Lund, G. Pessina | Different low noise JFET processes that have shown outstanding dynamic and noise performance at both room temperature and low temperatures have been selected. For most of them we have been able to detect the presence of shallow individual traps at low temperature, which create low frequency Generation-Recombination (G-R) noise. For one device type no evidence of traps has been observed at the optimum temperature of operation (around 100 K). It had a very small residual low frequency noise. This device has been cooled down to 14 K. From below 100 K down to 14 K the noise was observed to increase due to G-R noise originating from donor atoms (dopants) inside the channel. A very simple theoretical interpretation confirms the nature of G-R noise from these very shallow trapping centers. We also studied devices from a process optimized for room temperature operation and found noise corresponding to the presence of a single deep level trap. Even for this circumstance the theory was experimentally confirmed. The measurement approach used allowed us to achieve a very high accuracy in the modeling of the measured G-R noise. The ratio of the density of the atoms responsible for G-R noise above the doping concentration, NT/Nd, has been verified with a sensitivity around 10-7. |
| 4780 | 2003-10-01 | Test di Configurabilta' e Prestazioni del Router Juniper | 2003 | LNF-03-17(P).pdf | Franco Brasolin, Angelo Veloce | Questo documento illustra le modalità e i risultati dei test dei nuovi router Juniper della famiglia M5. Il lavoro si inserisce nelle attivita’ del Netgroup, afferente alla Commissione Nazionale di Calcolo e Reti dell’INFN. L’obiettivo è verificare la configurabilità e le performance di questi apparati in previsione della sostituzione degli attuali router di accesso alla rete GARR. This document shows procedures and tests of the new router Juniper of M5 family. This work is requested by the Netgroup belonging to the INFN National Commission of Network and Computing. The purpose is to verify how to set this Router and his performances. This is due to the future substitution of the INFN current Routers. |
| 4779 | 2003-09-18 | Novel High Flux X-Ray Source: A Laboratory Synchrotron | 2003 | LNF-03-16(P).pdf | O.V. Mikhin, S.B. Dabagov, V.D. Gelver, A.V. Priladyshev | A novel x-ray laboratory system optimized for diffraction studies of protein crystals and macromolecules as well as for phase contrast analysis and other applications is described. The system is based on a micro-focus X-ray source of 10W power and provides the minimum focal spot size of ~ 10 µm and the flux of ~ 4.5¥1012 ph/sec at the Cu Ka-line. |
| 4778 | 2003-09-10 | Results on Position Monitoring and Dispacement (Omega-Like Device) by Means of Fiber Bragg Grating Sensors for the BTeV Detector | 2003 | LNF-03-15(IR).pdf | L. Benussi, M. Bertani, S. Bianco, M.A. Caponero, D. Colonna, F. Di Falco, F.L. Fabbri, F. Felli, M. Giardoni, A. La Monaca, F.Massa, B. Ortenzi, M. Pallotta, A. Paolozzi, L. Passamonti, D.Pierluigi, A. Russo | We propose to use Fiber Bragg Grating sensors for position monitoring of silicon tracking detectors up to a micron precision. We also introduce the concept of a device (the Omega-like device) which, instrumented with FBG sensors, is able to relocate moving structures with a 10 micron precision. We show R&D results including long term stability, resolution, radiation hardness and characterization of Fiber Bragg Grating sensors used to monitor structure deformation, repositioning, and surveying of silicon detectors in High Energy Physics. |
| 4777 | 2003-09-09 | On Trapped Modes in the LHC Recombination Chambers: Numerical and Experimental Results | 2003 | LNF-03-14(P).pdf | B. Spataro, D. Brandt, F. Caspers, D. Li, M. Migliorati, A. Mostacci, L. Palumbo, F. Ruggiero, L. Vos | The recombination chamber in LHC (Large Hadron Collider) allows the separated proton beams to merge into a common vacuum chamber surrounding the interaction points. It has been subject of thorough studies concerning its interaction with the circulating beam. In this paper we present the numerical and experimental results of our investigation on an approximated geometry. We show that in the smooth transitions between pipes of different diameters a trapped mode may exist, both in the real and in the approximated geometry. In the real structure, the mode is weak and not harmful both for the beam stability and power loss |
| 4775 | 2003-09-09 | A Laser Pulse Shaper for the Low Emittance Radiofrequency SPARC Electron Gun | 2003 | INFN-BE-03-2.pdf | Simone Cialdi and Ilario Boscolo | The generation of an electron beam in a 3 GHz radiofrequency gun with a very low emittance requires a photocathode driven by a 10 ps ultraviolet high energy pulse with a rise time minor than 1 ps. This pulse can be provided by a Ti:Sa laser system completed with a pulse shaper programmed for that task. We discuss the design of a 4f-grating-lens pulse shaper optimized for our long rectangular pulse and for the lowest sensitivity to alignment. The Acousto-Optic Programmable Dispersive Filter shaping system is briefly discussed. |
| 4776 | 2003-09-09 | Features of a Phase-only Shaper Relative to a Long Rectangular Ultraviolet Pulse | 2003 | INFN-BE-03-3.pdf | Simone Cialdi, Ilario Boscolo and Alessandro Flacco | The generation of a very low-emittance high peak charge electron beam in a 3-GHz radiofrequency electron gun requires a rectangular shaped electron beam of 10 ps with a rise time less than 1 ps at the cathode surface. This is obtained illuminating a photocathode with a powerful ultraviolet laser pulse of that form. A programmable pulse shaper is added into the chain of the components of a femtosecond solid-state laser system for producing such a kind of pulse. The shaping system operates as a spectral phase-only filter. A genetic algorithm, in conjunction with a proper cost-function, is used to determine the phase function to be set in the shaper for generating the square pulse matching the specifications. The simulations show that the system is very sensitive to the signal parameters and alignment. The simulations show that the output signals at the fundamental and third harmonic have differences relevant for the setting of the system. |
| 4774 | 2003-09-03 | R&D Mechanical Studies of the Photon Detector Microcells and Modules for the EUSO Experiment | 2003 | INFN-TC-03-13.pdf | M. Ameri, F. Cadoux, R. Cereseto, G. Corti, S. Cuneo, P. Musico, E. Pace, A. Petrolini, P. Pollovio, F. Pratolongo, F. Siccardi, A. Vinci | During the phase 'A' of the EUSO experiment 5),6), extensive R&D studies have been done to optimise the mechanical arrangement of the photon multipliers on the focal surface. The activity has been focused on micro-cell and photon detector module sub-assemblies, the modular units that should tessellate the focal surface of the instrument. Alternative solutions have been investigated, simulations have been performed, prototypes built and tested. All that activity allowed to check the compliance of several features with the space environment, thus identifying those that could be applied in the final design. |
| 4773 | 2003-08-29 | Utilizzo del Software CASTOR al TIER1 CNAF | 2003 | INFN-TC-03-12.pdf | Ricci Pier Paolo per TIER1 staff | Lo sviluppo delle moderne tecnologie e la crescita delle richieste di spazio storage in termini di filesystem da parte degli esperimenti di fisica delle alte energie (HEPE High Energy Phisics Experiment) ci ha portati a considerare seriamente l'utilizzo di un hardware di librerie a nastro e di un software di archiviazione non proprietario. Nel presente articolo viene presentata la fase di test e pre-produzione svolta all’INFN CNAF Bologna utilizzando il software di archiving CASTOR realizzato al CERN con una descrizione dell'hardware e del software coinvolto oltre che ad una serie di risultati preliminari |
| 4772 | 2003-08-25 | Studies on a Bi-periodic X-band Structure for SPARC | 2003 | LNF-03-13(R).pdf | D. Alesini, A.Bacci, M.Migliorati, A.Mostacci, L.Palumbo and B.Spataro | The paper presents the design of a compact bi-periodic accelerating section, operating at the frequency of 11.424 GHz, for linearizing the longitudinal phase space in the Frascati Linac Coherent Light Source (SPARC). The structure operates on the p/2 standing wave mode with axial coupled cavities, and it is designed to obtain a 5 MV accelerating voltage. The proposed accelerating section represents an alternative design to the standard p-mode cavity, having some advantages as discussed in the paper. Numerical simulations have been carried out with SUPERFISH, OSCARD2D and ABCI codes, in frequency and in time domain. The study includes: field profile optimization, quality factor and shunt impedance calculation, analysis of the generator-cavity coupling and thermal analysis. |
| 4770 | 2003-07-23 | A Voltage Generator by Trasmission Lines | 2003 | INFN-TC-03-10.pdf | V. Nasssi, F. Belloni, D. Doria, A. Lorusso | In this paper we describe the design and the experimental results of a circuit able to compress a rectangular pulse causing its amplitude to increase. Utilizing a pulse forming line of 12 m long and a storage line of 6 m both connected on a load resistor by means of fast transistor switch, a time compression factor of 2 was achieved. Charging the pulse forming line at V_0, the output matched pulse was V_0/2, 120ns. Instead, the compressor output pulse was V_0,60 ns against a V_0,120ns pulse delivered by a 12 m Blumlein line charged at V_0. High voltage short pulse circuits open new horizons in the field of accelerator construction. |
| 4771 | 2003-07-23 | Theory and Realization of a New Current Pulse Compression Circuit | 2003 | INFN-TC-03-11.pdf | V. Nassisi, F. Belloni, D. Doria, A. Lorusso | In this work a new circuit to compress a pulse current utilizing transmission lines and transistor switches is proposed. It demonstrated a time compression factor of 2 on a low load impedance. A 12 m, 50\\Omega coaxial transmission line provided a current pulse of 3 A, 120 ns. A 6 m, 50\\Omega storage line connected to main line was able to store the 50% of the initial pulse. A fast switch was used in order to close both lines on a halved load impedance with respect to the transmission line characteristic one. We obtained a current pulse compression recording an output current of 6 A, 60 ns. PACS: 84.30N, 84.40Mk. |
| 4769 | 2003-07-22 | Ptential for Realiability Improvement and Cost Optimazion of LINAC and Cyclotron Accelerators | 2003 | INFN-TC-03-9.pdf | Paolo Pierini, Editor Contributors: D. Barni, P. Michelato, L. Monaco, M. Novati, R. Paulon, P. Pierini, D. Sertore (INFN-Milano-LAS), C. Pagani (University of Milano and INFN-Milano-LASA, R. Ferdinand, H. Safa, S. Palanque (CEA/Saclay), J.L. Biarrotte, C. Commeaux, T. Junquera, A.C. Mueller, A. Tkatchenko (CNRS/Orsay), L. Burgazzi (ENEA), Y. Jongen, D. Vandeplassche (IBA) | This document identifies and discusses the proper design strategies that have been followed in order to meet the reliability and availability specifications for a high intensity proton accelerator meant as the spallation neutron driver for an eXperimental Driven System (XADS) for nuclear waste transmutation. The document describes also how these strategies can be applied in the different components of the XADS accelerator design, and how design iterations can lead to reliability improvements. The Failure Mode and Effect Analysis (FMEA) methodology has been used on the suggested design for highlighting the reliability critical areas. Finally, a first rough cost estimation of the XADS accelerator is also provided. |
| 4767 | 2003-07-16 | MIR, a Feasibility Study for a Measurement of the Dynamical Casimir Effect | 2003 | INFN-AE-03-4.pdf | C. Braggio, G. Bressi, G. Carugno, C. Del Noce, V. Dodonov, A. Lombardi, A. Palmieri, G. Ruoso, D. Zanello | Even at absolute zero, the vacuum is seething with activity and behaves as a fluid in which moving objects dissipate their kinetic energy. The dynamical Casimir effect foresees that a metallic mirror put in motion in quantum vacuum gives rise to ”dissipated” energy in the form of real photons, called the Motion Induced Radiation. The final aim of this study is to present a solution to the main experimental difficulty, that is to realize the oscillating motion of the metallic wall at high frequency (10^9 ÷ 10^10 Hz). To obtain a fast moving wall we propose to switch an effective microwave mirror on and off in very short intervals of time changing the reflectivity of the semiconductor by shining pulsed laser beam on its surface. In this way a microwave mirror can be created and disappears at very high frequency, giving rise to a system equivalent to that of a fast moving metallic slab. |
| 4766 | 2003-07-11 | Papers Presented at PAC 2003 | 2003 | LNF-03-12(P).pdf | Accelerator Division | |
| 4764 | 2003-06-18 | Nota tecnica sul possibile utilizzo di Firewall nell’ INFN | 2003 | INFN-TC-03-7.pdf | Stefano Zani, Riccardo Veraldi, Franco Brasolin, Angelo Veloce, Mario Masciarelli, Claudio Soprano, Fulvia Costa | Questo documento e’ una nota tecnica prodotta dal sottogruppo Firewall del Netgroup afferente alla Commissione Calcolo e Reti dell’INFN. Il documento contiene un resoconto sui test effettuati sulle piattaforme di Firewall più diffuse e fornisce una valutazione dal punto di vista della funzionalità, gestibilità e prestazioni nell’ottica di possibili applicazioni nelle sezioni INFN. |
| 4768 | 2003-06-18 | Electron Donors And Their Role On The Performance Of Microwave Discharge And Electron Cyclotron Resonance Ion Sources | 2003 | INFN-TC-03-8.pdf | S. Gammino, G. Ciavola, L. Torrisi, L. Andò, L. Celona, M. Maggiore, S. Manciagli , M. Presti, C. Percolla, E. Calzona, V. Vinciguerra, S. Dobrescu, L. Schacter, A. Drentje, K. Stiebing | In order to enhance the output of highly charged ions from an electron cyclotron resonance ion source (ECRIS), several techniques like wall coating, biased disk, electron gun have been proposed and are meanwhile employed as standard tools at most of the existing installations. Although the detailed mechanisms are not clear, it has become evident that the additional injection of electrons into the plasma chamber of an ECRIS considerably improves its performances. Depending on the special conditions of the source these additional electrons can either compensate for losses of plasma electrons or even may change global plasma parameters (e.g. plasma potential) and hence positively influence the extraction at high rates of highly charged ions. The first experiments on biased disk were carried out at CEA, Grenoble and KVI, Groningen in 1990-91 and since then, this method is used by almost any ECRIS in the world. Wall coating is not so widely used but it has been proved to be effective not only for ECRIS but also for microwave discharge ion source (MDIS). Other methods to provide electrons to the plasma will be described in the following. In particular, at the Institute of Physics and Nuclear Engineering (IFIN-HH), Bucharest, special metal-dielectric (MD) structures of Al-Al2O3 have been developed. They are characterized by their very high secondary electron emission coefficients and therefore they seem to be ideal to be used in an ECRIS. Preliminary tests at IK in Frankfurt and at KVI have given interesting results. In the following an analysis of the possibilities opened by this method and other methods involving electron donors in ECRIS and MDIS field is carried out. |
| 4763 | 2003-06-12 | ULTRA -Uv Light Transmission and Reflection in the Atmosphere Technical Report. A supporting experiment for the EUSO project | 2003 | INFN-AE-03-3.pdf | Osvaldo Catalano, Piero Vallania, Didier Lebrun, Patrick Stassi, Mario Pimenta, Catarina Espirito Santo | The ULTRA experiment has been designed in the framework of the EUSO project to provide quantitative measurements of the reflected/diffused signal produced by the EAS impacting on the Earth surface. The detector is a hybrid system consisting of an UV optical detection unit, the UVscope, and an array of scintillators, the ETscope (EAS Telescope). The UVscope is used to detect Cherenkov diffused UV light from EAS which are detected in coincidence by the ETscope array. The atmospheric transmission properties will also be studied using the UV light detector and a laser emitter. Moreover, measurements of light from meteors are feasible with the same instrumentation. In this paper the various physical items involved in this research are introduced and discussed, and a detailed project of the experimental setup together with preliminary estimations of the expected performances are presented. |
| 4760 | 2003-06-11 | Beam Control and Manipulation with Microwave Devices in Particle Accelerators | 2003 | LNF-03-11(Thesis).pdf | David Alesini | |
| 4757 | 2003-06-10 | Annual Report 2002 | 2003 | LNF-03-10(IR).pdf | AA. VV. | |
| 4756 | 2003-06-10 | A Cicerone for the Physics of Charm | 2003 | LNF-03-9(P).pdf | S.Bianco, F.L.Fabbri, D.Benson, I.Bigi | After briefy recapitulating the history of the charm quantum number we sketch the experimental environments and instruments employed to study the behaviour of charm hadrons and then describe the theoretical tools for treating charm dynamics. We discuss a wide range of inclusive production processes before analyzing the spectroscopy of hadrons with hidden and open charm and the weak lifetimes of charm mesons and baryons. Then we address leptonic, exclusive semileptonic and nonleptonic charm decays. Finally we treat D^0 – barD^0 oscillations and CP (and CPT) violation before concluding with some comments on charm and the quark-gluon plasma. We will make the case that future studies of charm dynamics – in particular of CP violation – can reveal the presence of New Physics. The experimental sensitivity has only recently reached a level where this could reasonably happen, yet only as the result of dedicated efforts. This review is meant to be both a pedagogical introduction for the young scholar and a useful reference for the experienced researcher. We aim for a self-contained description of the fundamental features while providing a guide through the literature for more technical issues. |
| 4755 | 2003-05-23 | Response of an Underwater Cherenkov Detector to Supernova Neutrinos | 2003 | INFN-AE-03-2.pdf | Ernesto Amato, Lucrezia Auditore, Renato C. Barnà, Vincenzo D'Amico, Domenico De Pasquale, Antonio Italiano, Antonio Trifirò, Marina Trimarchi | We present a complete Monte Carlosimulation of the response of a realistic model of a deep-underwater Cherenkov detector to Supernova neutrinos. The various sources of noise are discussed in detail and a statistical treatment of the data is proposed based upon the integration on a properly chosen time interval. The results show that the neutrino flux emitted by a Supernovaexploding in our Galaxy can be detected from such a telescope |
| 4752 | 2003-05-07 | The Transversity Function and Doule Spin Azimuthal Asymmetry in Semi-Inclusive Pion Leptoproduction | 2003 | INFN-AE-03-1.pdf | Elvio Di Salvo | We show that the transverse momentum dependent transversity function is proportional to the longitudinal polarization of a quark in a transversely polarized proton. This result suggests an alternative, convenient method for determining transversity, without know-ing unusual fragmentation functions. The method consists of measuring the double spin azimuthal asymmetry in semi-inclusive pion leptoproduction by a transversely polarized proton target. The asymmetry, which is twist 3, is estimated to be more than 10%under the most favourable conditions. The experiment we suggest is feasible at facilities like DESY and CERN. |
| 4751 | 2003-05-07 | An X-Band Structure For a Longitudinal Emittance Correction at SPARC | 2003 | LNF-03-8(R).pdf | A.Bacci, M.Migliorati, L.Palumbo, B.Spataro | The paper presents the design of a compact standing wave accelerating structure operating at a frequency f =11.424 GHz for the low energy part of the X-FEL project to be realized at the Frascati Laboratories (SPARC). The structure, designed for obtaining a 5 MeV energy gain, has to be used for linearizing the longitudinal space phase in the Frascati Linac Coherent Light Source. Numerical electromagnetic simulations were carried out by using the numerical codes SUPERFISH and OSCARD2D in frequency domain and ABCI in time domain. This report describes the detailed behaviour of main RF parameters of a standing wave accelerating structure operating on p mode |
| 4747 | 2003-05-06 | Movable Faraday Cup Measurements for Ion Beams Characterization | 2003 | INFN-FM-03-1.pdf | D. Doria, A. Lorusso and V. Nassisi | In this article we present the results of a non-equilibrium laser-plasma generated by an ultraviolet excimer laser. These studies are very important to develop new ion sources via laser-plasma technique (LPT). All measurements were realized at fixed laser energy of 70 mJ. It was concentrated on a 0.004 cm2 spot by a convergent focal lens of 15 cm focal length. The target utilized was a disc of Cu of 99.99% pure and to detect the plasma flow pulse at different positions along drift tube, we developed an 8 cm in diameter movable Faraday cup. Analyzing the time-of-flight (TOF) pulse we was able to distinguish the electron pulse, the suprathermal ions and the thermal evolution of the plasma. Besides, applying a breakdown voltage as polarizing voltage to the Faraday cup, we characterized the neutral component. To determine the efficiency of the system on particles production, we measured the total etched material per pulse, 0.235 mg, and the fractional ionization, 10%. The flux distribution was measured by an optical transmission analysis of a Cu deposited film on a glass substrate. The ablation process expelled particles with an initial velocity of 34 km/s while the maximum ions concentration was emitted after 1 ms with a mean velocity of about 20 km/s. During the propagation the plasma longitudinal dimension changed from 7.5 cm near the target (8 cm) to 31 cm near the cup (40 cm). At low distances, the cup waveforms presented a plateau due to the high dense plasma which gets the space charge regime governed by the Child-Langmuir law. By our results the maximum charge distribution was generated at the target and it decreased with the distance. |
| 4749 | 2003-05-06 | Design and Manufacturing of Composite Spherical Mirrors for the GRAAL Cerenkov Particle Detector | 2003 | INFN-TC-03-6.pdf | G. Castiglioni, M. Castoldi, R. Cereseto, S. Cuneo, F. Mora, R. Puppo, L. Vigiani | This paper reports the manufacturing cycle set-up and the production results of the spherical mirrors to be installed in the GRAAL Cerenkov detector. Up to 121 mirrors have been assembled and checked. Production tips and statistics are reported here as a record for future similar application |
| 4750 | 2003-05-06 | LHCb Muon Off-Detector Eectronics: The IB System | 2003 | LNF-03-7(IR).pdf | Alessandro Balla, Matteo Beretta, Federico Bertino, Maurizio Carletti, Paolo Ciambrone, Giovanni Corradi, Giulietto Felici, Maurizio Gatta, Giovanni Paoluzzi, Giuseppe Papalino, Massimo Santoni | The LHCb muon trigger system is based on logical channels. For some stations and/or regions the logical channels correspond to the DIALOG outputs, while other stations and/or regions require a combination (OR) of channels coming from more than one chamber or more than one DIALOG output channels. In these cases special boards called Intermediate Boards (IB) are used to generate the logical channel. The 152 IB to instrument the muon detector will be located outside the chamber on the racks near the apparatus. Because of the radiation level foreseen near the detector (@ 2 krad) radiation tolerant device must be used to implement the logic. |
| 4746 | 2003-05-05 | Recent Advances and Novel Ideas for High Brightness Electron Beam Production Based on Photo-Injectors | 2003 | LNF-03-6(P).pdf | M. Ferrario, M. Boscolo, V. Fusco, C. Vaccarezza,C. Ronsivalle, J. B. Rosenzweig, L. Serafini | Photo-injectors beam physics remains a fruitful and exciting field of research. New ideas have been recently proposed to achieve ultra-high brightness beams, as particularly needed in SASE-FEL experiments, and to produce flat beams as required in linear colliders. An overview of recent advancements in photo-injector beam physics is reported in this paper. |
| 4745 | 2003-04-28 | Next generation long baseline experiments on the path to leptonic CP violation | 2003 | LNF-03-5(P).pdf | P.Migliozzi, F. Terranova | In this paper we quantify the trade-off between setups optimized to be ancillary to Phase II Superbeams or Neutrino Factories and experiments tuned for maximal sensitivity to the subdominant terms of the neutrino transition probability at the atmospheric scale (``maximum discovery potential''). In particular, the theta(13) sensitivity is computed for both Phase I superbeams (JHF-SK and NuMI Off-Axis) and next generation long baseline experiments (ICARUS, OPERA and MINOS). It is shown that Phase I experiments cannot reach a sensitivity able to ground (or discourage in a definitive manner) the building of Phase II projects and that, in case of null result and without a dedicated antineutrino run, this capability is almost saturated by high energy beams like CNGS, especially for high values of the ratio Delta m2_{21}/Delta m2_{31}. |
| 4748 | 2003-04-16 | Fault Considerations and Effects of Shorts in the Barrel Toroid Coil System | 2003 | INFN-TC-03-5.pdf | F. Broggi | The ATLAS Barrel Toroid (BT) is a superconducting toroid made of 8 coils of 25 m length and 5 m width, providing the magnetic field for the muon spectrometer of the ATLAS detector, one of the experiments of the Large Hadron Collider, under construction at CERN. In addition to the BT the ATLAS magnetic structure foresees two End Cap Toroid (ECT) with the same 8 structure geometry of the BT, and a Central Solenoid (CS). The evaluation of the forces arising in the Barrel Toroid coil system, when unbalanced current flows in different coils, has already been investigated when the LASA laboratory entered the ATLAS project. Here the refinement of the calculations, with the definitive parameters and discharge circuit configuration is done. |
| 3517 | 2003-03-25 | Biological Applications of Synchrotron Infrared Spectroscopy in Europe — BASIE | 2003 | LNF-03-4(NT).pdf | BASIE Collaboration: A. Marcelli (Coordinator), P. Calvani, P. Roy, D. Moss, L. Degiorgi, M.J. Tobin, U. Schade, K. Hinrichs, A. Mondini, L. Quaroni, A. Cupane, G. Onori, E. Burattini, M. Chesters, G. Menestrina, E. Goormaghtigh, P. Mariani, J. Breton, D. Naumann, M. Manfait, J. Susini, W.E. Smith, S.M. Doglia, M. Colombatti, B. Lendl, A. Barth, I. Anastassopoulou, M. Lankosz, P. Rich, S. Fisher | With the sequencing of the human genome completed, life science is entering the new era of structural and functional genomics and proteomics, in which the rapid identification and instantaneous sequencing of genes central to cellular processes and diseases leads to questions concerning the structure and function of the gene products. These new challenges require new methods of analysis and interdisciplinary efforts. In structural genomics, great progress has been made at so-called “structure factories”. But there remains a deficit in methods for studying the relationship between structure and function in proteins. Recently, FTIR spectroscopy has emerged as the most powerful tool for structural/functional investigations in biology because of its ability to provide information on processes at multiple levels of organization. It has been used to investigate structural-functional relationships and molecular mechanisms at the atomic level in purified proteins, but also for large protein complexes; for investigations of environmental toxin pathways and programmed cell death in cells; and for tissue classification and disease diagnosis in tissue. Although, in all of these studies, SR IR light sources bring FTIR spectroscopy to the cutting edge in terms of the spectral range and spatial resolution, it remains true that it is used by a few specialized research groups. The new era of life science research coincides with an unprecedented development in European capabilities: we have two well established IRSR beamlines at Daresbury and Orsay, joined last year by three new ones and more are under construction or are planned. BASIE will bring together interdisciplinary scientists from 10 EU countries, ready to develop together specialized equipments, techniques and software optimized for a range of life science studies covering all levels of organization from molecules to tissues. In this way, BASIE may be the leader in Europe for these strategic researches. |
| 4739 | 2003-03-21 | Preliminary Tests of Digital Pulse Shape Acquisition from Chimera CsI(Tl) Scintillators | 2003 | INFN-BE-03-1.pdf | M.Alderighi, A.Anzalone, L.Auditore, N.Arena, R.Bassini, C.Boiano, S.Brambilla, G.Cardella, S.Cavallaro, M.D’Andrea, E.DeFilippo, E.Geraci, D.Ghilardi, C.Gilardi, F.Giustolisi, A.Grzeszczuk, P.Guazzoni, E.Laguidara, G.Lanzanò, G.Lanzalone, D.Nicotra, P.Opichal, T.Paduszynski, A.Pagano, M.Papa, S.Pirrone, G.Politi, F.Porto, E.Rosato, S.Russof, G.Saccà, M.Sassi, G.Sechi, A.Trifirò, M.Trimarchi, S.Urso, M.Vigilante, L.Zetta | A sampling digital to analog converter (12-bit, 100 MS/s) has been used to perform a digital pulse shape acquisition of the signals coming from a typical CHIMERA 6x6x12 cm3 CsI(Tl) scintillator coupled to a standard CHIMERA electronic chain, up to the amplifier. The preliminary results obtained with Tandem beams are presented. |
| 4740 | 2003-03-21 | Installazione, Configurazione e Test di un Cluster di PC per Calcolo Parallelo e Seriale con Software Open-Source | 2003 | INFN-TC-03-4.pdf | Domenico Diacono | Questo documento illustra in modo dettagliato i passi necessari all’installazione di un cluster di PC Linux con il pacchetto software OSCAR. Il cluster è dotato di bilanciamento automatico del carico mediante openMosix e di ambiente di sviluppo parallelo MPI/PVM. Nel documento si dimostra come anche l’ambiente di calcolo parallelo può trarre beneficio della presenza del bilanciamento automatico del carico. |
| 3516 | 2003-02-24 | Commissioning of the DAFNE Beam Test Facility | 2003 | LNF-03-3(P).pdf | G. Mazzitelli, P. Valente | The DAFNE Beam Test Facility (BTF) is a beam transfer line optimized for the production of a defined number of electrons or positrons, in a wide range of multiplicities and down to single-electron mode, in the energy range between 50 and 800 MeV. The typical pulse duration is 10 ns and the maximum repetition rate is 50 Hz. The facility is aimed mainly for detector calibration purposes. The BTF has been successfully commissioned in February 2002, and started operation in November of the same year. The schemes of operation, the commissioning results, as well as the first users' experience are here reported. |
| 3515 | 2003-02-18 | Synchrotron Radiation from DAFNE Bending Magnet and Wiggler | 2003 | LNF-03-2(IR).pdf | Irina Titkova, Mikhail Zobov, Sultan Dabagov | DAFNE is a special kind of accelerator dedicated to the production of F-particles coming from the annihilation of electrons and positrons at the F-resonance energy. However, due to the very large circulating current, DAFNE represents also a high flux source of synchrotron radiation in the infrared and soft X-ray wavelength region. In this paper the main characteristics of synchrotron radiation from DAFNE’s wigglers and dipole magnets are estimated for the parasitic regime of operation. The results of calculations for KLOE and DEAR lattices have been compared. |
| 4738 | 2003-02-18 | Preliminary Design of TOTEM T1 Telescopes Mechanical Support Structures | 2003 | INFN-TC-03-3.pdf | M. Bozzo, S. Cuneo, K. Eggert, M. Macrì, M. Oriunno, R. Puppo | The present design of the TOTEM T1 telescopes mechanical support structure is described in detail in view of the Technical Design Report. Constraints, structural considerations, layout and operating sequences are described below, and will be used as a baseline for the final design. |
| 4737 | 2003-02-07 | Cyclotron Production of “High Specific Activity” Radiochemical Forms of Vanadium, Manganese and Tallium for Metallo-Toxicological Studies | 2003 | INFN-TC-03-2.pdf | Flavia Groppi, Claudio Birattari, Mauro Bonardi, Luigi Gini, Mario Gallorini, Enrico Rizzio, Enrico Sabbioni, Enzo Menapace, Dolores Arginelli, Alberto Ghioni and Hae Song Mainardi | In this paper are presented the production methods for very “high specific activity” radionuclides (HSARNs) of vanadium (V), manganese (Mn) and thallium (Tl), which have been developed in our laboratories for labeling different chemical forms of these elements present in the echo-systems in ultra-trace amounts, for metallo-toxicological and bio-kinetic studies. Use was made of both cyclotron and thermal nuclear reactor. If the nuclear reaction and/or decay product has atomic number different from irradiated target, it is possible separating the radioactive nuclide from irradiated target, without intentional addition of isotopic carrier. These kinds of radionuclides are named No Carrier Added, NCA, and their specific activity is very high and can reach values close to the theoretical Carrier Free one, CF. The experimental determination of specific activity, chemical and radiochemical purities is mandatory for all these kinds of applications. |
| 4736 | 2003-02-05 | Sistema di Deposizione di CsI in Camera di Evaporazione ad Alto Vuoto per Fotoconvertitori di un Rivelatore RICH | 2003 | INFN-TC-03-1.pdf | E.Cisbani, S.Colilli, F.Cusanno, R.Fratoni, F.Garibaldi, F.Giuliani, M.Gricia, M.Iodice, M.Lucentini, A.Mostarda, L.Pierangeli, F.Santavenere, G.M.Urciuli, P.Veneroni | Nell’ambito della collaborazione con il Laboratorio Jefferson Lab, in Virginia-Stati Uniti, il Gruppo Sanità Collegato della Sezione INFN di Roma 1, ha realizzato un rivelatore di tipo “ Ring Imaging Cherenkov” (RICH). Tale rivelatore è utilizzato in esperimenti di fisica degli ipernuclei, in Hall A al Jefferson Lab, sotto la responsabilità italiana, allo scopo di migliorare l’identificazione delle particelle (protone, pioni, mesoni K). Il piano di fotoconversione di fotoni Cherenkov emessi dalle particelle che attraversano un radiatore, nel rivelatore, rappresenta uno degli elementi più critici del rivelatore RICH. Il Gruppo Collegato ha progettato, costruito e messo a punto un sistema completo di deposizione di film di Ioduro di Cesio (CsI) su fotocatodi di dimensione 600x400 mm2, suddiviso in pad di 8x8 mm2. La presente nota descrive in dettaglio l’intero sistema consistente in un evaporatore di grandi dimensioni (altezza 1100 mm e diametro 1200 mm) con relativi sistemi di vuoto e di controllo.Le evaporazioni sino ad oggi realizzate hanno dato risultati eccellenti in termini di efficienza quantica di fotoconversione e le procedure tecniche utilizzate si sono dimostrate affidabili. |
| 3514 | 2003-01-09 | A Crystal Chemical Investigation of Cr Substitution in Muscovite by XANES Spectroscopy | 2003 | LNF-03-1(P).pdf | A. Cardelli, G. Cibin, M. Benfatto, S. Della Longa, M.F. Brigatti, A. Marcelli | This work introduces a novel procedure to fit the scattering features of XANES spectra. The procedure was applied and validated on a chromium containing muscovite for which structural and crystal chemical characterization is available from literature. The simulation, which involved clusters formed by up to 90 atoms, proved to be effective in representing the Cr local environment, even if the system is characterized by a very low metal content, as demonstrated by the extremely good correspondence with experimental data |
| 4735 | 2002-12-19 | LINMGR - Uno Strumento per la Gestione Centralizzata del Software su Sistemi Linux ReDHat | 2002 | INFN-TC-02-31.pdf | Roberto Gomezel, Tullio Macorini, Claudio Strizzolo, Lucio Strizzolo, Alessandro Tirel | In questo documento viene presentata una soluzione, realizzata presso la Sezione di Trieste dell’INFN, per la gestione centralizzata dei calcolatori con sistema operativo Linux RedHat, con l’obiettivo di semplificare l’installazione e l’aggiornamento dei pacchetti software, e la gestione dei sistemi. |
| 3548 | 2002-12-18 | Unexpected Detection of New Elements in Electrolytic Experiments with Deuterated Ethyl-alcohol, Pd Wire, Sr and Hg Salts | 2002 | LNF-02-031(P).pdf | F. Celani, A. Spallone, P. Marini, V. di Stefano, M. Nakamura, A. Mancini, G. D’Agostaro, E. Righi, G. Trenta, P. Quercia, C. Catena, V. Andreassi, F. Fontana, D. Garbelli, L. Gamberale, D. Azzarone, E. Celia, F. Falcioni, M.Marchesini, E. Novaro | The insoluble powder recovered at the bottom of our electrolytic cell, after several electrolytic deuterium loading/deloading cycles, was analysed by an ICP-MS analyser. The electrolyte was constituted of a deuterated hydro-alcoholic solution; Sr and Hg salts were added to such a solution at micromolar concentration; the cathode was a long and thin Pd wire. The ICP-MS analyses of the insoluble powder were motivated from the recent results of Y. Iwamura and collaborators at Mitsubishi Heavy Industries-Researh Center (Yokohama, Japan) showing reproducible “transmutation” of Sr into Mo (isotopic composition different from natural one) and Cs into Pr, when a special multilayer Pd sheet was subjected to a prolonged Deuterium gas flowing. Some of our results look partially in agreement with Y. Iwamura report. Other unexpected elements were also detected with an isotopic distribution close to the natural one. The production of stable isotopes by Selective Channel Photofission, according to the model of A.Takahashi (Osaka University, Japan), can help for understanding. Further works, hopefully also from other Laboratories, are needed to clarify this kind of results. |
| 4733 | 2002-12-18 | The INFN-GRID Testbed | 2002 | INFN-TC-02-30.pdf | Roberto Alfieri, Roberto Barbera, Patrizia Belluomo, Alessandro Cavalli, Roberto Cecchini, Andrea Chierici, Vincenzo Ciaschini, Luca Dell’Agnello, Flavia Donno, Enrico Ferro, Antonio Forte, Luciano Gaido, Antonia Ghiselli, Alberto Gianoli, Alessandro Italiano, Stefano Lusso, Marisa Luvisetto, Paolo Mastroserio, Mirco Mazzucato, Daniele Mura, Mario Reale, Livio Salconi, Marco Serra, Fabio Spataro, Francesco Taurino, Gennaro Tortone, Luca Vaccarossa, Marco Verlato, Giulia Vita Finzi | The INFN-GRID project, in close collaboration with the EU-funded DataGrid project, is facing the challenge of implementing a wide-area computational and data grid for the needs of the INFN experimental activities. The testbed is the test infrastructure where the grid services have been implemented. In this document the goals, the actual implementation and the future evolution of the testbed are described |
| 3547 | 2002-12-16 | Modeling Skin Effect in Large Magnetized Iron Detectors | 2002 | LNF-02-030(P).pdf | M. Incurvati, F.Terranova | The experimental problem of the calibration of magnetic field in large iron detectors is discussed. Emphasis is laid on techniques based on ballistic measurements as the ones employed by MINOS or OPERA. In particular, we provide analytical formulas to model the behavior of the apparatus in the regime, keeping into account eddy current effects and the finite penetration velocity of the driving fields. These formulas ease substantially the design of the calibration apparatus. Results are compared with experimental data coming from a prototype of the OPERA spectrometer. |
| 4731 | 2002-12-13 | A Transmission Line Circuit for High Current Pulses | 2002 | INFN-TC-02-28.pdf | V. Nassisi and A. Pedone | An new concept to get high current pulses by transmission lines has been developed. Utilizing two 50 W transmission lines and a fast transistor to switch on the circuit, a rectangular current pulse without the reduction to a half of its intensity has been obtained. 8 m long transmission lines were charged up to 1 kV. They yielded a current pulse of 20 A, 500 V of maximum voltage. Similar set up opens applications in the field of high current short pulse generators. |
| 4732 | 2002-12-13 | Intense Plasma Generated by Laser Irradiation | 2002 | INFN-TC-02-29.pdf | D. Doria, V. Nassisi and A. Pedone | In this work we present the experimental results concerning the study of the plasma produced by pulsed laser irradiation of a copper target. The analysis of the generated plasma plume was performed for three different laser spot sizes determining the threshold conditions of the ablation process. A diagnostic system with a Faraday cup was developed in order to detect the ion current along the propagation tube. Time-of-flight (TOF) measurements were performed, and an adjustable voltage electrostatic barrier was employed in order to analyse the kinetic energy of the produced ions. To study the plasma characteristics we evaluated the total etched material per pulse, 1.8x1016 atoms/cm 2 , and the fractional ionisation, 36%. A modified Maxwell-Boltzmann distribution was applied to provide a consistent description of the velocity distributions in the plume. The ablated material was spatially monitored by optical transmission analysis of a deposited film. |
| 4729 | 2002-12-12 | Behaviour and Measurements of the Interpancake Joint of the BØ ATLAS Model Coil | 2002 | INFN-TC-02-27.pdf | F. Broggi, N. Dolgetta, G. Volpini | The ATLAS Barrel Toroid (BT) consists of 8 superconducting coils of 25 m length and 5 m width, it provides the magnetic field for the muon spectrometer of the ATLAS detector, one of the experiments of the Large Hadron Collider, under construction at CERN. The cable used for the coils is an Aluminum stabilized NbTi rutherford cable and the coils are built with the double pancake technique, so a resistive joint between the cables of the two single pancake is present. The transverse magnetic field induces eddy currents, during the ramping of the main current, whose intensity can sometimes exceed the transition limit. B0 is a one third length, full large scale model of one of the eight magnet composing the ATLAS barrel toroid. The B0 construction was decided to test the technical construction solutions and reproduce the behaviour of the final coils. In this paper the behaviour of the interpancake joint is analyzed and compared with theoretical models describing the current distribution at the joint. Measurements of the joint resistance are reported. |
| 3546 | 2002-12-10 | Light Quark Spectroscopy Results from FOCUS and E687 | 2002 | LNF-02-029(P).pdf | Stefano Bianco on behalf of the FOCUS and E687 Collaborations: J.M. Link, L. Agostino, G. Alimonti, J.C. Anjos, V. Arena, R. Baldini-Ferroli, S. Barberis, I. Bediaga, G. Bellini, L. Benussi, J.M. Bishop, G. Boca, G. Bonomi, M. Boschini, D. Brambilla, D. Buchholz, J.N. Butler, B. Caccianiga, A. Calandrino, S. Carrillo, E. Casimiro, N.M. Cason, C. Castoldi, C. Cawlfield, A. Cerutti, H.W.K. Cheung, G. Chiodini, K. Cho, Y.S. Chung, S. Cihangir, L. Cinquini, L. Cinquini, D. Claes, N. Copty, R. Culbertson, J.P. Cumalat, C. Dallapiccola, P. D'Angelo, T.F. Davenport III J.M. de Miranda, M. DiCorato, P. Dini, A.C. dos Reis, L. Edera, D. Engh, C.J. ennedy, S. Erba, F.L. Fabbri, P.L. Frabetti, I. Gaines, P.H. Garbincius, R. Gardner, L.A. Garren, M. Giammarchi, G. Gianini, J.F. Ginkel, B. Gobbi C. Göobel, E. Gottschalk, S.A. Gourlay, R. Greene, T. Handler D.J. Harding, H. Hernandez, M. Hosack, P. Inzani, W.E. Johns, J.S. Kang, P.H. Kasper, D.Y. Kim, G.N. Kim, B.R. Ko, A.E. Kreymer, A. Kryemadhi R. Kutschke, J.W. Kwak, Y. Kwon P. Lebrun, K.B. Lee, F. Leveraro, G. Liguori, T.F. Lin, A.M. Lopez, J. Magnin, S. Malvezzi, A. Massafferri, D. Menasce, H. Mendez, L. Mendez, M. Merlo, E. Meroni, M. Mezzadri, L. Milazzo, A. Mirles, E. Montiel, L. Moroni, S.S. Myung M.S. Nehring, D. Olaya, B. O'Reilly, D. Pantea, V.S. Paolone, K.S. Park, H. Park, D. Pedrini, I.M. Pepe, L. Perasso, C. Pontoglio, F. Prelz, M. Purohit, D.L. Puseljic, J. Quinones, A. Rahimi, J.E. Ramirez, S.P. Ratti, M. Reyes, C. Riccardi, C. Rivera, M. Rovere, R.C. Ruchti, S. Sala A. Sala, M. Sales, A. Sánchez-Hernández, I. Segoni M. Sheaff P.D. Sheldon, W.D. Shephard, S. Shukla, F. Simõ, K. Stenson, J.A. Swiatek, P. Torre, D. Torretta, C. Uribe, E.W. Vaandering F. Vasquez L. Viola, M. Vittone, P. Vitulo, M.S. Webster, J.R. Wilson, J. Wiss, Z.Y. Wu, P.M. Yager, A. Zallo, Y. Zhang | Using the FOCUS spectrometer (experiments 687 and 831 at Fermilab) we confirm the existence of a diffractively photoproduced enhancement in $K^+K^- $ at 1750~\mevcc with nearly 100 times the statistics of previous experiments. We also observe a narrow dip structure at 1.9~GeV/c$^2$ in a study of diffractive photoproduction of the $~3\pi^+3\pi^-$ final state. |
| 3542 | 2002-11-29 | Beam-Beam Interaction Effects in DAFNE | 2002 | LNF-02-027(Thesis).pdf | Manuela Boscolo | Tesi di Dottorato di Ricerca in Elettromagnetismo Applicato e Scienze Elettrofisiche — Tutore: Prof. L. Palumbo, Correlatore: Dott. Mikhail Zobov, Coordinatore dottorato: Prof. Giorgio Gerosa |
| 3545 | 2002-11-29 | Experimental Review of Atmospheric Neutrino Oscillations | 2002 | LNF-02-028(P).pdf | F. Ronga | A short review of the atmospheric neutrino experiments is given. The main enphasis is placed on SuperKamiokande, Soudan-2 and MACRO. |
| 4728 | 2002-11-18 | Planning on the Grid: a Status Report | 2002 | INFN-TC-02-26.pdf | Gabriele Garzoglio, Francesco Giacomini, Francesco Prelz, Massimo Sgaravatto, Todd Tannenbaum, Igor Terekhov | Traditional batch job schedulers are a poor fit for a grid computing environment. In order to respond to the grid scheduling challenges, the client must perform planning. In this paper, we expound upon the differences between planning versus scheduling, and present two grid projects which utilize a ClassAd matchmaking framework to enable planning on the grid. Planning for purposes of job placement within the EU DataGrid and DZero SAMGrid projects will be explored. |
| 4734 | 2002-11-11 | Relazione del Comitato per le Pari Opportunita’ dell’INFN Anno 2001 | 2002 | INFN-AM-02-01.pdf | R. Alba, L. Brogiato, S. Cappelli, P. Fabbri, L. Fioretti, D. Muscolino, M.L. Paciello, G. Pancheri, P. Pilloni, P. Rufini, G. Ruggieri, C. Vannini | |
| 3541 | 2002-10-21 | Activity Report 2001 | 2002 | LNF-02-024(IR).pdf | AA.VV | |
| 4727 | 2002-10-21 | The HARP TOF-WALL Performance and Time Calibration | 2002 | INFN-BE-02-03.pdf | F. Bobisut, A. De Min, D. Gibin, A. Guglielmi, M. Laveder, A. Menegolli, M. Mezzetto and E. Pagan | The procedure to calibrate in time the scintillation counters of the HARP TOF-WALL using cosmic muons is described in detail. The analysis of the collected cosmic events was also used to evaluate the performance of the detectors in terms of efficiency and time resolution. All scintillation counters resulted to be fully efficient. The procedure allowed to precisely align in time the signals of all counters so that an overall intrinsic time resolution of 9 160 ps could be achieved |
| 3540 | 2002-10-18 | The DEAR Kaon Monitor at DAFNE | 2002 | LNF-02-023(P).pdf | V. Lucherini, A. M. Bragadireanu, G. Beer, C. Curceanu (Petrascu), J.-P. Egger, C. Guaraldo, M. Iliescu, T. Ponta, D.L. Sirghi, F. Sirghi, J. Zmeskal | Characteristics and performance of the kaon monitor of the DEAR experiment at the DA$\Phi$NE collider of Laboratori Nazionali di Frascati are described. The full TDC and ADC information collected from the detectors of the setup allows a clean observation of the charged kaon pairs from $\phi$-decayby means of their different arrival times with respect to the background particles. The number of detected kaons can be used to obtain an absolute luminosity measurement in the DEAR interaction point at DA$\Phi$NE |
| 4726 | 2002-10-15 | Preliminary Design of the Junction Box Pressure Vessels for the NEMO Experiment - R&D Phase | 2002 | INFN-TC-02-25.pdf | M. Ameri, S. Cuneo, D. Garufi, M. Musumeci, R. Occhipinti, R. Papaleo, G. Raia | According with the R&D philosophy of the first phase of NEMO experiment, an extensive investigation have been carried out in order to find practical alternatives to the standard design of pressure vessels for junction boxes that should operate on the sea bed for a long lifetime. Both technical and economical points of view have been considered, as well as reliability. Possible suppliers have been contacted to check the feasibility of the different solutions and estimate their cost. A final trade-off has been proposed, to help the collaboration to choose the solution for the detector prototype phase. |
| 3539 | 2002-09-30 | International Committee for Future Accelerators - Sponsored by the Particles and Fields Commission of IUPAP Beam Dynamics, Newsletter, No. 28 | 2002 | LNF-02-022(P).pdf | Editors in Chief: W. Chou and J.M. Jowett - Editors: C. Biscari, S. Chattopadhyay, S. Ivanov, H. Mais, J. Wei, and C. Zhang | At its meeting in Amsterdam on 30 July, ICFA approved the 29th ICFA Advanced Beam Dynamics Workshop: Beam Halo Dynamics, Diagnostics, and Collimation (HALO’03) to be held on Long Island, New York, USA, 19-23 May 2003. This workshop will include a parallel workshop on Beam-beam Interactions. Further information on this and all other Panel activities can be found later in this newsletter and on our home page. |
| 3538 | 2002-09-24 | Study of the $K^{+}K^{-}\pi^{+}\pi^{-}\pi^{0}$ final state in antiproton annihilation at rest in gaseous hydrogen at NTP with the OBELIX spectrometer | 2002 | LNF-02-021(P).pdf | F. Nichitiu, P. Gianotti, C. Guaraldo, A. Lanaro, V. Lucherini, C. Petrascu, A. Rosca, , G. Bonomi, M. P. Bussa, A. Donzella, E. Lodi Rizzini, L. Venturelli, A. Zenoni, A. Bertin, M. Bruschi, M. Capponi, S. De Castro, D. Galli, B. Giacobbe, U. Marconi, I. Massa, M. Piccinini, N. Semprini-Cesari, R. Spighi, S. Vecchi, V. Vagnoni, M. Villa, A. Vitale, A. Zoccoli, C. Cical`o, A. De Falco, A. Masoni, S. Mauro, G. Puddu, G. Usai, O. E. Gorchakov, S. N. Prakhov, A. M. Rozhdestvensky, V. I. Tretyak, M. Poli, V. Filippini, A. Fontana, P. Montagna, A. Rotondi, P. Salvini, F. Balestra, L. Busso, P. Cerello, O. Denisov, R. Garfagnini, A. Grasso, A. Maggiora, A. Panzarasa, D. Panzieri, F. Tosello, E. Botta, T. Bressani, D. Calvo, S. Costa, D. D'Isep, A. Feliciello, A. Filippi, S. Marcello, M. Agnello, F. Iazzi, B. Minetti, N. Mirfakhrai, S. Tessaro | A spin-parity analysis of a sample of $\bar{p}p \rightarrow K^+ K^- \pi^+ \pi^- \pi^0$ annihilation events taken at rest in gaseous $H_{2}$ at NTP is reported. The invariant mass spectrum of the $K^{+} K^{-} \pi^{0}$ system shows the presence of the $E/\iota$ resonance pattern at 1.42 GeV. The analysis of this signal confirms the results obtained by the OBELIX Collaboration in previous works, namely: the existence of two pseudoscalar states at 1.413 $\pm$ 0.002 and 1.460 $\pm$ 0.012 GeV with widths 0.051 $\pm$ 0.004 and 0.120 $\pm$ 0.015 GeV, respectively. The $\bar{p}p$ system in the $^{3}P_{1}$ wave shows also a signal corresponding to the axial vector $f_{1}(1420)$ decaying to $K^{*} \bar{K}$ with mass 1.420 $\pm$ 0.003 GeV and width 0.061 $\pm$ 0.005 GeV. A study of the incoherent phase space background shows that its origin is mostly due to the reflection of a resonant state in the $K^+ K^- \pi^+ \pi^-$ system. The isobar decomposition of this resonant state is mainly $f_{0}(1370)(\pi\pi)_{S}$, its parameters are: $J^{PC}$ = $0^{++}$, $m = 1.670 \pm 0.02$ GeV and width $0.267 \pm 0.036$ GeV. This signal can be probably identified with another decay mode of the $f_{0}(1710)$. |
| 4725 | 2002-09-24 | Realizzazione di un Sistema di Trasporto per Fotocatodo CsI | 2002 | INFN-TC-02-24.pdf | G. Menon | Questo documento descrive la realizzazione e il test di verifica di un sistema di trasporto e stoccaggio per fotocatodi di rivelatori MWPC utilizzati come fotorivelatori in contatori RICH,mantenuti in atmosfera di gas inerte a pressione costante L ’apparecchiatura è stata realizzata nel Laboratorio dell ’Area di Ricerca della Sezione di Trieste. |
| 3536 | 2002-09-17 | Geometry of N=4 Twisted String | 2002 | LNF-02-019(P).pdf | S. Bellucci, A. Deriglazov, A. Galajinsky | We compare $N=2$ string and $N=4$ topological string within the framework of the sigma model approach. Being classically equivalent on a flat background, the theories are shown to lead to different geometries when put in a curved space. In contrast to the well studied K\'ahler geometry characterising the former case, in the latter case a manifold has to admit a covariantly constant holomorphic two--form in order to support an $N=4$ twisted supersymmetry. This restricts the holonomy group to be a subgroup of $SU(1,1)$ and leads to a Ricci--flat manifold. We speculate that, the $N=4$ topological formalism is an appropriate framework to smooth down ultraviolet divergences intrinsic to the $N=2$ theory. |
| 3537 | 2002-09-17 | AdS/CFT Equivalence Transformation | 2002 | LNF-02-020(P).pdf | S. Bellucci, E. Ivanov, S. Krivonos | We show that any conformal field theory in $d$-dimensional Minkowski space, in a phase with spontaneously broken conformal symmetry and with the dilaton among its fields, can be rewritten in terms of the static gauge $(d-1)$-brane on AdS$_{(d+1)}$ by means of an invertible change of variables. This nonlinear holographic transformation maps the Minkowski space coordinates onto the brane worldvolume ones and the dilaton onto the transverse AdS brane coordinate. One of the consequences of the existence of this map is that any $(d-1+m)$-brane worldvolume action on AdS$_{(d+1)}\times X^m$ (with $X^m$ standing for the sphere $S^m$ or more complicated curved manifold) admits an equivalent description in Minkowski space as a nonlinear and higher-derivative extension of some conventional conformal field theory action, with the conformal group being realized in a standard way. The holographic transformation explicitly relates the standard realization of the conformal group to its field-dependent nonlinear realization as the isometry group of the brane AdS$_{(d+1)}$ background. Some possible implications of this transformation, in particular, for the study of the quantum effective action of ${\cal N}=4$ super Yang-Mills theory in the context of AdS/CFT correspondence, are briefly discussed. |
| 4724 | 2002-09-16 | Ristrutturazione dei Servizi di Calcolo Centrali per la Sezione INFN ed i Dipartimenti di Fisica dell’Università di Torino | 2002 | INFN-TC-02-23.pdf | G. Bar, A.D’Ambrosio | In occasione dell’aggiornamento dell’hardware dei calcolatori centrali della nostra Se-zione, si è proceduto ad una ristrutturazione completa dei servizi ospitati su tali calcolatori, tenendo in considerazione anche le esigenze particolari della Sezione INFN di Torino. Infatti, quest’ultima, oltre al dominio to.infn.it, gestisce anche quello dei Dipartimenti di Fisica ph.unito.it ed i relativi servizi (posta elettronica, web, ecc..) |
| 3535 | 2002-09-12 | NEXAFS Experiment and Multiple Scattering Calculations on KO2: effects on the phi resonance in the solid phase | 2002 | LNF-02-018(P).pdf | M. Pedio, Z. Y. Wu, M. Benfatto, A. Mascaraque, E. Michel, C. Ottaviani, C. Crotti, M. Peloi, M. Zacchigna, C. Comicioli | The high-energy resolution O K-edge absorption NEXAFS spectrum has been measured for in situ prepared potassium superoxide. The experimental data have been analyzed in detail by multiple scattering calculations using self-consistent field potentials. In particular the so-called pi resonance at rising edge, which presents a double peaks structure, has been totally resolved and reproduced by the calculations. This analysis indicates that the grown material is arranged in a KO2 structure with an O-O distance between 1.31Å and 1.34Å. Moreover, the calculation demonstrates both a complete ionic character of the bound between the O2- anion and the K atoms and a strong interaction between the anion and the solid-state matrices. |
| 3534 | 2002-09-09 | Local and average Fe distribution in trioctahedral micas: Analysis of Fe K-edge XANES spectra in the phlogopite-annite and phlogopite-tetra-ferriphlogopite joins on the basis of single-crystal XRD refinements | 2002 | LNF-02-017(P).pdf | F. Tombolini, M.Franca Brigatti, A. Marcelli, G. Cibin, A. Mottana, G. Giuli | In Fe-bearing trioctahedral micas Fe2+ occurs essentially in the octahedral O sheet whereas Fe3+ can either coexist with Fe2+ in the octahedral M sites or occur in tetrahedral T sites. Fe K-edge absorption spectra of twelve micas were recorded in an effort to relate their absorption features to the results of single-crystal X-ray structure refinements obtained on crystals from the same rock sample. This study involves the three end members phlogopite, annite and tetra-ferriphlogopite, used as reference materials, and nine micas intermediate in composition along the joins phlogopite-tetra-ferriphlogopite and phlogopite-annite. A detailed analysis of the XAS spectral features singles out the independent effects of coordination and valence shows and distinctly different position vs. intensity trends to be present that depend upon the local environment of Fe2+ and Fe3+. Bond distances evaluated from XANES spectra at the edge, or FMS, region agree well with those obtained by X-ray diffraction refinement. Distinct variations in the local to intermediate ranges of order of certain micas are determined by the analysis of XANES, or IMS, regions; they supplement well the information on their long range orders best obtained by X-ray refinement. |
| 4723 | 2002-09-09 | Authorization with multiple Virtual Organizations | 2002 | INFN-TC-02-22.pdf | V.Ciaschini, F. Spataro | In the grid world, users expect to be able to log into a grid-enabled machine without the need of having a personal account on the machine itself. To this end, users have organized themselves into Virtual Organizations (VOs) and access to the machines is (excepting differences in local policy, like for example the banning of a specific user) generally granted on the bases of VO membership. Up to now, users who are members of more than a Virtual Organization (VO) (or different subgroups of a single VO) have had no way to specify this while logging into the grid. This paper describes a possible solution to this problem. |
| 4721 | 2002-09-05 | The LASA Fast Acquisition System for the B00 and B0 Diagnostics | 2002 | INFN-TC-02-21.pdf | G. Rivoltella, A. Paccalini, F. Broggi | The ATLAS Barrel Toroid (BT) is a superconducting toroid made of 8 superconducting coils of 25 m length and 5 m width, providing the magnetic field for the muon spectrometer of the ATLAS detector, one of the experiments of the Large Hadron Collider, under construction at CERN. B0 is a full scale model, one third length of ATLAS barrel toroid eight coils. The B0 construction was decided to test the technical construction solutions and reproduce the behaviour of the final coils. In the frame of the ATLAS collaboration, the LASA Laboratory had to provide the acquisition system for the electrical signals from the B0 model coil. During the coils excitation there are two physical conditions: the power-on steady state and the quench event. The LASA-DAQ acquires always at the same sampling rate (500 Sample/sec), while the data storing occours once at second in steady state and at maximum speed during the quench. In this paper the characteristics and the design; both hardware and software, of the acquisition system of the electrical signals from the B0 model coil are described. |
| 4722 | 2002-07-20 | Construction of a Fast Laser-based Calibration System for the HARP Tof counters wall | 2002 | INFN-AE-02-02.pdf | M. Bonesini, M. Paganoni, A. Parravicini, A. Tonazzo, A. Andreoni, M. Bondani, F. Paleari, A. Sottocornola-Spinelli, D. Gibin, A. Guglielmi, A. Menegolli | A calibration and monitoring system for the Harp experiment scintillator-based time of flight system has been developed, by using an Nd-Yag laser with passive Q-switch and active/passive mode-locking and a custom made laser light injection system based on a bundle of IR monomode optical fibers. For the laser pulse timing a novel ultrafast InGaAs MSM photodiode, with 30 ps risetime, has been used. Experience over a several months data taking period in 2001 and 2002 shows that drifts in timing down to about 70 ps can be traced. |
| 3533 | 2002-07-12 | Papers Presented at EPAC 2002 | 2002 | LNF-02-016(P).pdf | Accelerator Division | (No Abstract) |
| 4719 | 2002-07-12 | Determination of the Normal Zone Length in the B0 ATLAS Model Coil | 2002 | INFN-TC-02-19.pdf | F. Broggi | The ATLAS Barrel Toroid (BT) is a superconducting toroid made of 8 coils of 25 m length and 5 m width, providing the magnetic field for the muon spectrometer of the ATLAS detector, one of the experiments of the Large Hadron Collider, under construction at CERN. In addition to the BT the ATLAS magnetic structure foresees two End Cap Toroid (ECT) with the same 8 structure geometry of the BT, and a Central Solenoid (CS). The B0 construction was decided to test the technical construction solutions and reproduce the behavior of the final coils. The most powerful diagnostic sensors for studies of the quench propagation are the pick-up coils. In this paper a short description of the characteristics of the pick-up coil signal, related to the quench propagation and to the current diffusion from the conductor to the stabilizer is given. Then, from the quench propagation velocity and the pick-up coil signal characteristics, the dimensions of the Normal Zone (NZ), the transited part of the cable, is determined, for different values of the main current in the magnet. The determination of the NZ dimensions is influenced by some experimental parameters, error affected, and by some assumptions. Because of these assumptions the NZ dimensions determined are only indicative, more precise measurements are not so far possible. |
| 4720 | 2002-07-12 | Design and Calibration of the Pick-up Colil for B0 and B00 ATLAS model Coil | 2002 | INFN-TC-02-20.pdf | G. Baccaglioni, F. Broggi, G. Cartegni | The ATLAS Barrel Toroid (BT) is a superconducting toroid made of 8 superconducting coils of 25 m length and 5 m width, providing the magnetic field for the muon spectrometer of the ATLAS detector, one of the experiments of the Large Hadron Collider, under construction at CERN. In addition to the BT the ATLAS magnetic structure forsees two End Cap Toroid (ECT) with the same 8 structure geometry of the BT, and a Central Solenoid (CS). B00 is a small coil built to verify the performances of the different cables used in the ATLAS magnets, while B0 is a full scale model, one third length of ATLAS barrel toroid eight coils. The B0 construction was decided to test the technical construction solutions and reproduce the behaviour of the final coils. To fulfil this aim the coil has been equipped with many sensors, among which the pick-up coil are very important for the study of the quench characteristics. In the frame of this collaboration one of the item of the INFN was to provide some diagnostic sensors, among which about 20 pick-up coil, for the quench propagation studies. In this paper the design and characteristics of the pick-up coil used in the B00 and B0 model coil are described, together with the calibration procedure. Some data measured during the magnet test are reported and discussed. |
| 4717 | 2002-07-11 | Simulating a Data GRID Environment | 2002 | INFN-TC-02-17.pdf | M. Castellano, G. Piscitelli, F. Tarricone, D. Di Bari, D. Cozza | |
| 4718 | 2002-07-11 | Scheduling System in a GRID Environment | 2002 | INFN-TC-02-18.pdf | M. Castellano, G. Piscitelli, F. Tarricone, D. Di Bari, D. Cozza | |
| 3530 | 2002-07-02 | Evidence of Anomalous Tritium Excess in D/Pd Overloading Experiments | 2002 | LNF-02-013(P).pdf | F. Celani, A. Spallone, P. Marini, V. di Stefano, M. Nakamura, E. Righi, G. Trenta, P. Quercia, A. Mancini, G. D’Agostaro, C. Catena, S. Sandri, C. Nobili, V. Andreassi | Measurements of Tritium have been performed, using a very low background and accurate instrumentation, on electrolytes before and after Deuterium absorption in Palladium wires. Tritium was always present in the electrolytic cells, having long and thin Palladium wires (carefully degassed) as cathode and Platinum wire as anode, because “normal contamination” of deuterated liquids. Two different kinds of electrolytes were used (unusual, for several aspects, to conventional ones adopted in Cold Fusion experiments): the first one was composed by heavy water in DCl acidic environment (pH=4.5) with the addition of Strontium (and Mercury) salts at micro-molar concentration, the second one was composed by heavy ethyl alcohol--heavy water solution (concentration ratio about 11:1), acidic environment (DCl+D2SO4), with the addition of Strontium and Mercury concentrated as before. We have found anomalous Tritium production (at large statistical significance) only when the achieved loading ratio (D/Pd) was quite large (about 0.95) and several loading/deloading cycles had been performed. |
| 3531 | 2002-07-02 | Electrochemical D loading of Palladium wires by heavy ethyl-alcohol and water electrolyte, related to Ralstonia bacteria problematics | 2002 | LNF-02-014(P).pdf | F. Celani, A. Spallone, P. Marini, V. di Stefano, M. Nakamura, A. Mancini, G. D’Agostaro, E. Righi, G. Trenta, P. Quercia, C. Catena | Taking in considerations the several effects of new kinds of bacteria living in heavy water (discovered by us in 1999), from the point of view of Deuterium (D) overloading inside Palladium (Pd), it was developed (since June 2001) a new kind of electrolyte based on mixture of alcohol and water (both heavy) with proper addition of Strontium (Sr) and Mercury (Hg) salts in an acidic environment (DCl, D2SO4): all these procedure according to what developed from our group since 1996 for H2O solutions (without H2SO4) and, since 2000, for light water-alcohol (with H2SO4). It was found excess heat (by high accuracy flow calorimeter) and excess Tritium (T) production (by low background T measurement instrumentation) only when the loading ratio was quite high and some movements to D inside Pd was performed. Efforts will be done to increase the absolute values of such experimental results, in the near future. |
| 3532 | 2002-07-02 | Experimental studies to achieve H/Pd loading ratio close to 1 in thin wires, using different electrolytic solutions | 2002 | LNF-02-015(P).pdf | A. Spallone, F. Celani, P. Marini, V. Di Stefano | Systematic studies have been performed in order to achieve very high concentration of Hydrogen (or Deuterium) into a Palladium lattice. In a very diluted acid electrolytic cell a thin Pd cathode wire (100 mm) and tick anode Pt wires (0.5 mm) has been used as electrodes in a coaxial geometry. Normalised resistance (R/Ro) of Pd-H wire system has been measured on-line and used as reference of H/Pd values. Alcoholic solution (95%) and electrolytic solution (5%) has been used with addition of a very low amount of Sr and Hg ions; high loading results have been achieved with a satisfactory grade of reproducibility. A typical result of this procedure is to have achieved, stable in the time, R/Ro=1.15 (corresponding to an estimation of H/Pd@1) with an extremely low electrolytic power supply (7 V, 5 mA). Transferring this procedure to Deuterated solution, until now a lower loading has been achieved (R/Ro= 1.55 as about D/Pd= 1.97). |
| 3529 | 2002-06-28 | VII LNF Spring School 2002 | 2002 | LNF-02-012(IR).pdf | AA. VV. | Transparencies |
| 4715 | 2002-06-28 | The HARP TOF-WALL Counter Construction and Test | 2002 | INFN-AE-02-01.pdf | G. Barichello, F. Bobisut, A. De Min, D. Gibin, A. Guglielmi, M. Laveder, A. Menegolli | In this note the preparation of the TOF-WALL scintillation counters for the PS214 experiment (HARP) at CERN PS and the laboratory tests with cosmic rays are reported. The measurement of detection efficiencies, time resolutions and attenuation of signals along the counters shows very good performances. The intrinsic time resolution resulted to be $\sim$ 150 ps. |
| 4716 | 2002-06-21 | INFN GRID DATAGRID Prototype 1 | 2002 | INFN-TC-02-16.pdf | F.Donno, L.Gaido, A.Ghiselli, M.Mazzucato, F.Prelz, M.Sgaravatto | Introduction: Computing and networking technology evolution leads to more powerful computers and to high speed networks as low-cost commodity components. In parallel there is a growth of large-scale computing needs with high number of users widely distributed. This scenario is changing the way to think about-and use-computing resources. One of the most interesting and challenging approaches is the “computational grid” concept. DataGrid (www.eu-datagrid.org) is a European project (EDG) aiming to build a computational grid prototype on the basis of requirements coming from users in the application fields of the High Energy Physics[1], Earth Observations (EO) [2], and Bio-Informatics [3]. The first prototype of DataGrid is in place, since December 2001, with the functionalities foreseen in the release 1 of the project. The purpose of this document is to describe the most important characteristics of the grid proposal, the services of the first prototype and some of the problems emerged from the experience of the first steps of the project. |
| 3528 | 2002-06-14 | High Intensity, Pulsed, Slow Positron and Neutron Sources at INFN – Frascati | 2002 | LNF-02-011(IR).pdf | S. Bartalucci | Considerable progress in RF Superconductivity in the last decade opened the possibility of building electron Linacs with high average intensity and high quality beams. This fact in turn has revitalized the use of Linacs for the production of secondary beams (like neutrons and slow positrons), which find many applications in Interdisciplinary Research. An overview of such sources, to be developed at the INFN Frascati Laboratories and implemented in the future high-brilliance, X-FEL Facility, is presented in this paper. |
| 3527 | 2002-06-10 | Beam Dynamics Study of a Muon Ionization Cooling Experiment | 2002 | LNF-02-010(IR).pdf | M. Aleksa, J.F. Amand, R. Garoby, F. Gerigk, K.Hanke, E.B. Holzer, E.S. Kim, A. Lombardi, M. Migliorati, S. Russenschuck, F. Tazzioli, C. Vaccarezza | We present a summary of simulation results for a muon cooling experiment. Two possible scenarios have been studied: The first is a subsection of the 88 MHz cooling channel in the CERN reference scheme for a neutrino factory. The second system studied is based on 200 MHz cavities as proposed in the US study II design. The studies comprise a scan of input beam parameters, various optics with and without alternating solenoid polarity as well as a cross-check with an independent simulation code. |
| 4714 | 2002-06-05 | The Description of the TempHuRA-Meter | 2002 | INFN-TC-02-15.pdf | M. Anghinol¹, M. Battaglieri, P. Cocconi, R.DeVita, F. Parodi, M. Ripani, A. Rottura, M. Taiuti, S. Zavatarelli | |
| 4712 | 2002-05-23 | Open SSL API Mini-Tutorial | 2002 | INFN-TC-02-14.pdf | R. Veraldi | Dopo una breve descrizione del protocollo SSL vengono presentate le principali API in C della libreria OpenSSL, toolkit Open Source che implementa SSL v2/v3 e TLS v1. Viene anche analizzato un esempio di semplice applicazione client/server da cui potere iniziare per sviluppare proprie applicazioni SSL. |
| 4711 | 2002-05-22 | Studio del Particolato Atmosferico nelle Frazioni Fine e Grossa del PM10 nelle Città di Firenze, Genova, Milano e Napoli nel Periodo 18 Gennaio – 16 Febbraio 2001 | 2002 | INFN-TC-02-13.pdf | V. Ariola, L. Campajola, A. D’Alessandro, P. Del Carmine, F. Gagliardi, F. Lucarelli, P. A. Mandò, G. Marcazzan, R. Moro, S. Nava, P. Prati, G. Valli, R. Vecchi, A. Zucchiatti | The composition of particulate matter in the atmosphere has been studied in four major italian towns (Florence, Genoa, Milan and Naples) by means of Ion Beam Analysis (IBA) techniques. The aerosol has been simultaneously collected in the four towns during the first weeks of 2001, by two-stage continuous streaker samplers, which separate the particulate matter in two fractions (fine and coarse fraction of PM10). The hourly concentrations in air of about 20 elements have been deduced by Particle Induced X-ray Emission, PIXE, analyses performed with the external proton beam facility of the 3 MV accelerator of INFN, at the Physics Department of the University of Florence. RIASSUNTO — La composizione del particolato atmosferico in quattro grandi città italiane (Firenze, Genova, Milano e Napoli) è stata studiata con tecniche di Ion Beam Analysis (IBA). I campioni di particolato sono stati raccolti simultaneamente nelle quattro città durante le prime settimane del 2001 per mezzo di campionatori continui a due stadi (streaker samplers), che separano e raccolgono il particolato in due frazioni granulometriche (frazioni fine e grossa del PM10). L’andamento orario della concentrazione di una ventina di elementi è stato dedotto tramite misure PIXE (Particle Induced X-ray Emission), eseguite col setup di fascio esterno dell’acceleratore dell’INFN presso il Dipartimento di Fisica dell’Università di Firenze. |
| 4709 | 2002-05-13 | The Instrumentation of the B0 ATLAS Model Coil | 2002 | INFN-TC-02-11.pdf | R. Berthier, F. Broggi, A. Paccalini, G. Rivoltella | The ATLAS Barrel Toroid (BT) is a superconducting toroid made of 8 superconducting coils of 25 m length and 5 m width, providing the magnetic field for the muon spectrometer of the ATLAS detector, one of the experiments of the Large Hadron Collider, under construction at CERN. B0 is a full scale model, one third length of ATLAS barrel toroid eight coils. The B0 construction was decided to test the technical construction solutions and reproduce the behaviour of the final coils. To fulfil this aim the coil has been equipped with many sensors. This paper describes the whole sensors/instrumentation system installed on B0. |
| 4710 | 2002-05-13 | Test on CERN Isolation Amplifiers Card and New Design for the B0 Diagnostic Voltage Acquisition Card | 2002 | INFN-TC-02-12.pdf | G. Rivoltella, A. Paccalini, F. Broggi | In the frame of the ATLAS collaboration, the LASA Laboratory had to provide the acquisition system for the electrical signals from the B0 model coil. B0 is a full scale model, one third length of ATLAS barrel toroid eight coils. The B0 construction was decided to test the technical construction solutions and reproduce the final coils behaviour. Two types of electrical signal must be handled, the isolated and the non-isolated ones. The isolated signals, for example, come from the inductive pick-up coil, while the non isolated signals are the ones coming directly from the cable. In order to interrupt the ground loops, reject the common-mode voltage, the electromagnetic noise and to protect the acquisition system from overvoltages during a quench, galvanic insulation must be provided. In this paper the test performed on two existing insulating CERN cards (POTAIM and DVMM) are reported. Then a new card design, better fitting the acquisition electronic requirements, is discussed. The design is validated by the utilization of the acquisition cards and system for the B00 tests. Typical signals from the B00 magnet are reported; the noise problem is discussed and the noise reduction solution is presented. |
| 3526 | 2002-05-10 | Probing the Coordination and Geometry of Heme-iron Ligands in Hemoproteins by XANES (X-ray Absorption Near Edge Structure) | 2002 | LNF-02-009 (P).pdf | S. Della Longa, M. Benfatto | X-ray Absorption Near Edge Structure (XANES) spectroscopy, is an emerging technique related to EXAFS (Extended X-ray Absorption Fine Structure) spectroscopy. XANES probes the electronic state and the atomic structure of a metal site in biological macromolecules at any physical state of the sample and any environmental condition. For instance, the pH-dependent and temperature-dependent XANES spectra of ferric aquomet-myoglobin in solution have been studied to probe the main Fe-heme conformational changes following its acid-alkaline chemical transition, and the temperature-dependent spin transition of the alkaline form. In these last years, multiple scattering (MS) theory has been shown able to reproduce satisfactorily the experimental XANES data from the edge up to 150-200 eV. The ability to analyse the low-energy part of a x-ray absorption spectrum allows determining structural data that are very difficult to recover by EXAFS, such as bonding angles. Using light triggered systems allows to study trapped intermediate conformations and some aspects of the dynamics of biological complexes. XANES theory has been applied to interpret the dramatic spectroscopical changes in the XANES spectrum of a carbonmonoxy-myoglobin single crystal, following the photolysis of the Fe-CO bond at T=20K. The distance and orientation of the CO molecule from the Fe atom, and the position of the proximal histidine, have been determined at a resolution comparable with that of the more recent X-ray diffraction (XRD) studies. Preliminary applications of the quantitative XANES analysis to hemoproteins in solutions are also presented. |
| 3524 | 2002-05-09 | Study of the Decay $\phi\rightarrow\eta\pi^0\gamma$ with the KLOE Detector | 2002 | LNF-02-007(P).pdf | The KLOE Collaboratoin: A. Aloisio, F. Ambrosino, A. Antonelli, M. Antonelli, C. Bacci, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, S. A. Bulychjov, G. Cabibbo, R. Caloi, P. Campana, G. Capon, G. Carboni, M. Casarsa, V. Casavola, G. Cataldi, F. Ceradini, F. Cervelli, F. Cevenini, G. Chiefari, P. Ciambrone, S. Conetti, E. De Lucia, G. De Robertis, P. De Simone, G. De Zorzi, S. Dell'Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, M. Dreucci, O. Erriquez, A. Farilla, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, C. Forti, A. Franceschi, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, F. Grancagnolo, E. Graziani, S. W. Han, M. Incagli, L. Ingrosso, W. Kim, W. Kluge, C. Kuo, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, F. Lu, M. Martemianov, M. Matsyuk, W. Mei, L. Merola, R. Messi, S. Miscetti, M. Moulson, S. M"uller, F. Murtas, M. Napolitano, A. Nedosekin, F. Nguyen, M. Palutan, L. Paoluzi, E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, E. Petrolo, G. Pirozzi, L. Pontecorvo, M. Primavera, F. Ruggieri, P. Santangelo, E. Santovetti, G. Saracino, R. D. Schamberger, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, E. Spiriti, G. L. Tong, L. Tortora, E. Valente, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura, Y. Xu Y. Yu, Y. Wu | In a sample of \pt5.3,7, \f-decays observed with the KLOE detector at the Frascati \f-factory \DAF\ we find 605 \et\po\gam\ events with $\eta\rightarrow\gamma\gamma$ and 197 \et\po\gam\ events with $\eta\rightarrow\pi^+\pi^-\pi^0$. The decay \et\po\gam\ is dominated by the process \f$\rightarrow$\ao\gam. From a fit to the \et\po\ mass spectrum we find BR(\f$\rightarrow$\ao(980)\gam)= $(7.4\pm0.7)\times 10^{-5}$. |
| 3525 | 2002-05-09 | CTF3 Design report | 2002 | LNF-02-008(IR).pdf | D.Alesini, C.Biscari, R.Boni, A.Clozza, G.Di Pirro, A.Drago, A.Gallo, A.Ghigo, F.Marcellini, C.Milardi, M.A.Preger, C.Sanelli, F.Sannibale, M.Serio, F.Sgamma, A.Stecchi, A.Stella, M.Zobov, R.Bossart, H.Braun, P.Brown, G.Carron, V.Chohan, R.Corsini, E.D'Amico, S.Deghaye, J.P.Delahaye, F.DiMaio, S.Doebert, B.Dupuy, G.Geschonke, L.Gröning, G.Guignard, H.Hellgren, S.Hutchins, J.H.Lewis, E.Jensen, G.McMonagle, A.Millich, J.Monteiro, J.P.Delahaye, T.Otto, P.Pearce, E.Peschardt, R.Pittin, M.Poehler, J.P.Potier, L.Rinolfi, T.Risselada, G.Rossat, P.Royer, D.Schulte, J.Sladen, G.Suberlucq, I.Syratchev, F.Tecker, H.Trautner, L.Thorndahl, I.Wilson, W.Wünsch, A.Yeremian, R.Miller, R.Ruth, R.Koontz, I.N.Ross, E. Bente, G. Valentine, G.Bienvenu, M.Bernard, M.Omeich, R.Roux, T.Garvey | The design of CLIC is based on a two-beam scheme, where short pulses of high power 30 GHz RF are extracted from a drive beam running parallel to the main beam. The 3rd generation CLIC Test Facility (CTF3) will demonstrate the generation of the drive beam with the appropriate time structure, the extraction of 30 GHz RF power from this beam, as well as acceleration of a probe beam with 30 GHz RF cavities The project makes maximum use of existing equipment and infrastructure of the LPI complex, which became available after the closure of LEP. |
| 3523 | 2002-05-06 | A New Method to Obtain a Precise Value of the Mass of the Charged Kaon | 2002 | LNF-02-006(P).pdf | G. Beer, A.M. Bragadireanu, e ,W. Breunlich, M. Cargnelli, C. Curceanu (Petrascu), J.-P. Egger, H. Fuhrmann, C. Guaraldo, M. Giersch, M. Iliescu, T. Ishiwatari, K. Itahashi, B. Lauss, V. Lucherini, L. Ludhova, J. Marton, F. Mulhauser, T. Ponta, A.C. Sanderson, L.A. Schaller, D.L. Sirghi, F. Sirghi and J. Zmeskal | The results of a feasibility study performed by measuring, with a test setup at the collider DAFNE of Frascati, two previously unobserved transitions of kaonic nitrogen, demonstrated the possibility to make a precision measurement of the mass of the charged kaon. |
| 3522 | 2002-04-23 | Environment and Nuclear Physics: The GEDI Experiment | 2002 | LNF-02-005(IR).pdf | E. Bernieri, A. Balerna, A. Esposito, U. Denni, M. Chiti, M.A. Frani and V. Tullio | The aim of GEDI (Gamma Emission in Deep Ice) experiment was the realisation of a portable g-ray spectrometer for in situ radioactivity measurements on glaciers and snowfields. This kind of measurements is very useful in a wide set of environmental studies, in particular during glacial drillings for ice core studies and in pollution monitoring in high altitude or in remote areas, were sampling is difficult or impossible. In this paper the instrument realised and its performances on the field are described in detail. The results of the first measurements performed on the Appennini and Himalaya range, showing the presence in the snow of small amounts of the artificial radioisotope 137Cs, are also reported and discussed. |
| 3521 | 2002-04-22 | Measurement of Gamma (Ks->pi+pi- (gamma))/(Ks->pi0pi0) | 2002 | LNF-02-004(P).pdf | The KLOE Collaboratoin: A. Aloisio, F. Ambrosino, A. Antonelli, M. Antonelli, C. Bacci, R. Baldini-Ferroli, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, S. A. Bulychjov, G. Cabibbo, R. Caloi, P. Campana, G. Capon, G. Carboni, M. Casarsa, V. Casavola, G. Cataldi, F. Ceradini, F. Cervelli, F. Cevenini, G. Chiefari, P. Ciambrone, S. Conetti, E. De Lucia, G. De Robertis, P. De Simone, G. De Zorzi, S. Dell'Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, M. Dreucci, O. Erriquez, A. Farilla, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, C. Forti, A. Franceschi, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, F. Grancagnolo, E. Graziani, S. W. Han, M. Incagli, L. Ingrosso, W. Kluge, C. Kuo, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, F. Lu, M. Martemianov, M. Matsyuk, W. Mei, L. Merola, R. Messi, S. Miscetti, M. Moulson, S. Mueller, F. Murtas, M. Napolitano, A. Nedosekin, F. Nguyen, M. Palutan, L. Paoluzi, E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, E. Petrolo, G. Pirozzi, L. Pontecorvo, M. Primavera, F. Ruggieri, P. Santangelo, E. Santovetti, G. Saracino, R. D. Schamberger, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, E. Spiriti, G. L. Tong, L. Tortora, E. Valente, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura, Y. Xu, Y. Yu | We have measured the ratio R= Gamma (Ks->pi+pi-(gamma))/(Ks->pi0pi0) with the KLOE detector at the DAFNE e+e- collider. This measurement is fully inclusive with respect to the pi+pi-gamma final state. The sample of over 10^6 two-pion decays of tagged Ks mesons allows a statistical error as low as 0.1% to be obtained. The accuracy is limited by systematic uncertainties, which are estimated primarily from data. We find R=2.236 +/- 0.003(stat) +/- 0.015(syst). |
| 4708 | 2002-04-17 | I Moduli di Controllo Locale (LCM) in Titanio del Rivelatore ANTARES | 2002 | INFN-TC-02-10.pdf | M. Ameri, M. Anghinolfi, M. Battaglieri, P. Cocconi, S. Cuneo, R. DeVita, F. Parodi, P. Pollovio, A. Rottura, S. Zavatarelli | La Sezione INFN di Genova ha realizzato i contenitori in titanio utilizzati in un test di immersione di parte del rivelatore ANTARES, il telescopio sottomarino per la misura di neutrini di alta energia. Questo report descrive le loro caratteristiche, il tipo di lavorazione utilizzato e il sistema autonomo contenuto in uno di essi per la misura dell’accelerazione e della rotazione durante le fasi di immersione dell’apparato. |
| 3519 | 2002-04-10 | The Trigger System of the KLOE Experiment | 2002 | LNF-02-002(P).pdf | The KLOE Collaboration: M. Adinolfi, F. Ambrosino, M. Antonelli, C. Bini, V. Bocci, F. Bossi, P. Branchini, G. Cabibbo, R. Caloi, M. Casarsa, G. Cataldi, P. Ciambrone, E. De Lucia, G. De Robertis, P. De Simone, S. Dell'Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, G. Felici, A. Ferrari, G. Finocchiaro, C. Forti, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Graziani, P. Guarnaccia, M. Incagli, C. Kuo, G. Lanfranchi, M. Martemianov, W. Mei, R. Messi, M. Moulson, S. Muller, F. Murtas, L. Pacciani, M. Palutan , E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, D. Picca, G. Pirozzi, L. Pontecorvo, M. Primavera, F. Ruggieri, P. Santangelo, E. Santovetti, G. Saracino, C. Schwick, B. Sciascia, A. Sciubba, I. Sfiligoi, T. Spadaro, E. Spiriti, P. Valente, B. Valeriani, G. Venanzoni, A. Ventura | We present the design of the trigger system for the KLOE experiment at the Frascati phi-factory DAFNE. The detector consists of a large volume drift chamber and a calorimeter both immersed in a 0.52 T solenoidal field. The trigger, structured with a first- and a second-decision level, is based on multiplicity of energy deposits in the calorimeter and of hits in the drift chamber. The selection criteria are described and the efficiency for detecting phi decays are evaluated with the data collected during the first runs. |
| 3520 | 2002-04-10 | Study of the Decay phi --> pi0 pi0 gamma with the KLOE Detector | 2002 | LNF-02-003(P).pdf | The KLOE Collaboration: A.Aloisio, F.Ambrosino, A.Antonelli, M.Antonelli, C.Bacci, G.Bencivenni, S.Bertolucci, C.Bini, C.Bloise, V.Bocci, F.Bossi,P.Branchini, S.A.Bulychjov, G.Cabibbo, R.Caloi, P.Campana, G.Capon, G.Carboni, M.Casarsa, V.Casavola, G.Cataldi, F.Ceradini, F.Cervelli, F.Cevenini, G.Chiefari, P.Ciambrone, S.Conetti, E.DeLucia, G.DeRobertis, P.DeSimone, G.DeZorzi, S.Dell'Agnello, A.Denig, A.DiDomenico, C.DiDonato, S.DiFalco, A.Doria, M.Dreucci, O.Erriquez, A.Farilla, G.Felici, A.Ferrari, M.L.Ferrer, G.Finocchiaro, C.Forti, A.Franceschi, P.Franzini, C.Gatti, P.Gauzzi, S.Giovannella, E.Gorini, F.Grancagnolo, E.Graziani, S.W.Han, M.Incagli, L.Ingrosso, W.Kim, W.Kluge, C.Kuo, V.Kulikov, F.Lacava, G.Lanfranchi, J.Lee-Franzini, D.Leone, F.Lu, M.Martemianov, M.Matsyuk, W.Mei, L.Merola, R.Messi, S.Miscetti, M.Moulson, S.Muller, F.Murtas, M.Napolitano, A.Nedosekin, F.Nguyen, M.Palutan, L.Paoluzi, E.Pasqualucci, L.Passalacqua, A.Passeri, V.Patera, E.Petrolo, G.Pirozzi, L.Pontecorvo, M.Primavera, F.Ruggieri, P.Santangelo, E.Santovetti, G.Saracino, R.D.Schamberger, B.Sciascia, A.Sciubba, F.Scuri, I.Sfiligoi, T.Spadaro, E.Spiriti, G.L.Tong, L.Tortora, E.Valente, P.Valente, B.Valeriani, G.Venanzoni, S.Veneziano, A.Ventura, Y.Xu, Y.Yu, Y.Wu | We have measured the branching ratio BR( phi --> pi0 pi0 gamma ) with the KLOE detector using a sample of ~5x10^7 phi decays. phi mesons are produced at DAFNE, the Frascati phi-factory. We find BR(phi-->pi0pi0gamma) = ( 1.09 +- 0.03(stat) +- 0.05(syst) )x10^-4. We fit the two--pion mass spectrum to models to disentangle contributions from various sources. |
| 4705 | 2002-04-10 | A Novel Scheme for the Integrated Voltage Divider of Silicon Drift Detectors | 2002 | INFN-TC-02-07.pdf | P. Burger, C. Piemonte, A. Rashevsky, A. Roncastri, A. Vacchi | Developing a large area silicon drift detector (SDD) for the ALICE experiment, one of the objectives was to work out a robust and redundant design. As soon as the detector is planned to work without an external divider, the integrated voltage divider plays an important role. Unlike the case of silicon microstrip or pixel detectors, a single defect in the SDD may be propagated throughout the whole detector. We report a new design of the integrated voltage divider that allows to prevent this propagation in most practical cases. Device simulations complement laboratory measurements |
| 4706 | 2002-04-10 | Method of Punch-Through Voltage Stablisation in Silicon Detectors | 2002 | INFN-TC-02-08.pdf | C. Piemonte, A. Rashevsky | Dealing with large-scale application of semiconductor detectors, one of the keystones is to ensure the robustness and long-term electrical stability. A phenomenon that can compromise the performance of a system based on these detectors is the dependence of the {\it punch-through} effect on the environmental conditions. In this paper we investigated the influence of humidity on the punch-through in microstrip and drift silicon detectors. Simulations and laboratory measurements on different prototypes were performed. Data analysis allowed to determine a special solution for the design of the cathode metallisation mask that reduces in a substantial way the evolution of the punch-through voltage due to humidity influence. |
| 4707 | 2002-04-10 | Irradiation Tests of the ALICE Silicon Drift Detector at the LINAC of the “Elettra” Synchrotron in Trieste | 2002 | INFN-TC-02-09.pdf | C. Piemonte, A. Rashevsky, A. Roncastri | Three ALICE-D2 Silicon Drift Detectors were irradiated with 1 GeV electrons at the LINAC of the ”Elettra” Synchrotron in Trieste. The aim of this test was to verify the radiation hardness of the device under an electron fluence equivalent to the particle fluence of ten years of ALICE operation. The anode current, the voltage distribution on the integrated divider and the operation of the MOS injectors were tested. The note reports the results of these tests. |
| 4702 | 2002-04-04 | Adhesive Joint Design of a Full Composite, Ultra-Light Structure for High energy Physics | 2002 | INFN-TC-02-04.pdf | S. Cuneo, R. Cereseto, F. Gastaldo, F. Mora, M. Olcese, C. Pizzorno, R. Puppo | This note describes the activities done to design, optimise and qualify the glued joints of the composite support structure (stave) for the sensitive elements of the ATLAS Pixel Detector to be installed in the new Large Hadron Collider at CERN (Centre Européen pour la Recherche Nucleaire, Genève, Switzerland) 1). About 150 staves will have to be produced. The series production issues have been addressed and the manufacturing process has been set up. |
| 4703 | 2002-04-04 | An Ultra-Light Composite Structure to Support Electronic Devices in a Synchrotrone Particle Detector | 2002 | INFN-TC-02-05.pdf | S. Cuneo, R. Cereseto, F. Gastaldo, F. Mora, M. Olcese, C. Pizzorno, R. Puppo | This paper describes the extensive program of activity carried out to design, qualify and optimize the composite support structures (staves) for the sensitive elements of the ATLAS Pixel Detector to be installed in the new Large Hadron Collider at CERN. Design consideration, structural and thermal simulations and test covered all critical aspect of the components, finding a good agreement, so that the requirements in operation are expected to be met; the results are reported in detail. |
| 4704 | 2002-04-04 | The ECLISSE Experiment: Production of High Intensity Ion Beam by Means of a Hybrid Ion Source | 2002 | INFN-TC-02-06.pdf | S. Gammino, L. Torrisi, L. Andò, G. Ciavola, L. Celona, S. Genovese, A. M. Mezzasalma, J. Krása, L.Láska, M. Pfeifer, K. Rohlena, E. Woryna, J. Wolowski, P. Parys, G.D. Shirkov, V. Mironov | The ECLISSE project (ECR ion source Coupled to a Laser Ion Source for charge State Enhancement) started in 1999 with the aim to obtain intense beam of highly charged ions (pulsed mode) by means of the coupling between a Laser Ion Source (LIS) and an electron cyclotron resonance (ECR) ion source. The major points to be investigated appeared to be the coupling efficiency of the ion beam produced by the LIS to the ECR plasma, as well as the possibility to enhance the available charge state by an ECRIS with respect to the standard methods used now to produce ion beams from solid samples (i.e. evaporation and sputtering). The theory suggests that this concept may be effective, provided that the ion energy from the LIS is of the order of a few hundreds of eV. The main features of the theory will be shown in the following, along with the results obtained in the off-line test at LNS facility (Nd:YAG laser 0.9 J / 9 ns, laser power densities < 10^11 W/cm^2) and at IPPLM facility (Nd:glass laser 10 J / 1 ns, limited to 1.5 J). |
| 3518 | 2002-03-25 | Measurement of the branching fraction for the decay | 2002 | LNF-02-001(P).pdf | The KLOE Collaboration: A. Aloisio, F. Ambrosino, A. Andryakov, A. Antonelli, M. Antonelli, C. Bacci, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, S. A. Bulychjov, G. Cabibbo, R. Caloi, P. Campana, G. Capon, G. Carboni, M. Casarsa, V. Casavola, G. Cataldi, F. Ceradini, F. Cervelli, F. Cevenini, G. Chiefari, P. Ciambrone, S. Conetti, E. De Lucia, G. De Robertis , R. De Sangro, P. De Simone, G. De Zorzi, S. Dell’Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, M. Dreucci, O. Erriquez, A. Farilla, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, C. Forti, A. Franceschi, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, F. Grancagnolo, E. Graziani, S. W. Hand, M. Incagli, L. Ingrosso, W. Kluge, C. Kuo, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, F. Lud, M. Martemianov, M. Matsyuk, W. Mei, A. Menicucci, L. Merola, R. Messi, S. Miscetti, M. Moulson, S. M¨uller, F. Murtas, M. Napolitano, A. Nedosekin, F. Nguyen, M. Palutan, L. Paoluzi, E. Pasqualucci, L. Passalacqua, A. Passeri, V. Patera, E. Petrolo, D. Picca, G. Pirozzi, L. Pontecorvo, M. Primavera, F. Ruggieri, N. Russakovic, P. Santangelo, E. Santovetti, G. Saracino, R. D. Schamberger, B. Sciascia, A. Sciubba, F. Scuri, I. Sfiligoi, T. Spadaro, E. Spiriti, G. L. Tong, L. Tortora, E. Valente, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura, Y. Xu, Y. Yu, P. F. Zema | We present a measurement of the branching ratio \BR{\K\toP\pienu} performed using the KLOE detector. \ks-mesons are produced in the reaction \epemphikskl\ at the \DAF\ collider. In a sample of %$\ab\!\pt 5,7,$ \f\ decays$\ab\!\pt 5,6,$ \ks-tagged events we find \VS{624}{30} semileptonic \ks\ decays. Normalizing to the \ks\toP\pic\ count in the same data sample, we obtain $\BR{\DKSeIII}\!=\!\pt(6.91\pm0.37),-4,$, in agreement with the Standard Model expectation. |
| 4700 | 2002-03-21 | Study of the Reaction Mechanism of the $^{12}C+^{14}N$ Process at 28 and 35 MeV | 2002 | INFN-BE-02-02.pdf | E. Amato, L. Auditore, R. C. Barnà, V. D'Amico, D. De Pasquale, A. Italiano, A. Trifirò, M. Trimarchi | The study of the $^{12}C(^{14}N,^{14}N)^{12}C$ reaction was performed at two energies: 28 and 35 MeV. The results were analyzed in the frame of the EFR-DWBA (Exact-Finite-Range Distorted Wave Born Approximation) assuming the simultaneous and sequential transfer of a {\sl np} pair. The angular distributions, fairly reproduced in the first case, confirm the validity of the ge\-ne\-ra\-li\-zed BCS (Bardeen-Cooper-Schrieffer) theo\-ry to explain this behaviour. Moreover this process could be regarded as a possible Nuclear Josephson Effect. |
| 4699 | 2002-03-04 | A Detectors od GravitationalWaves Based on Coupled Microwaves Cavities | 2002 | INFN-TC-02-03.pdf | A.Chincarini, G. Gemme, R. Parodi, P.Bernard, and E. Picasso | Since 1978 superconducting coupled cavities have been proposed as sensitive detector of gravitational waves. The interaction of the gravitational wave with the cavity walls, and the resulting motion, induces the transition of some electromagnetic energy from an initially excited cavity mode to an empty one. The energy transfer is maximum when the frequency of the wave is equal to the frequency difference of the two cavity modes. In this paper the basic principles of the detector are discussed. The interaction of a gravitational wave with the cavity walls is studied in the proper refrence frame of the detector, and the coupling between two electromagnetic normal modes induced by the wall motion is analyzed in detail. Noise sources are also considered; in particular the noise coming from the brownian motion of the cavity walls is analyzed. In the last section some ideas for the developement of a realistic detector of gravitational waves are discussed; the outline of a possible detector design and its expected sensitivity are also shown. |
| 4698 | 2002-02-27 | Realizzazione di un Mail Server su Trucluster con Software ASE | 2002 | INFN-TC-02-02.pdf | R. Gomezel, C. Strizzolo, L. Strizzolo, A. Tirel | Questo documento descrive la realizzazione di un mail server, effettuata su un sistema proprietario con processore Alpha in configurazione TruCluster. La struttura, realizzata presso la Sezione di Trieste, utilizza il software ASE. |
| 4697 | 2002-02-14 | A New Setup for the Underground Study of Capture Reactions | 2002 | INFN-BE-02-01.pdf | P. Cocconi, A. Loiano, F. Parodi, A. Rottura, R. Cereseto, M. Parodi, A. Manco, S. Minutoli, A. Palmieri, F. Siccardi | For the study of astrophysically relevant capture reactions in the underground laboratory LUNA a new setup of high sensitivity has been implemented. The setup includes a windowless gas target, a 4p BGO summing crystal, and beam calorimeters. The setup has been recently used to measure the d(p,g)3He cross section for the first time within its solar Gamow peak i.e. down to 2.5 keV c.m. energy. The features of the optimized setup are described. |
| 4696 | 2002-01-23 | The AGILE Silicon Tracker: An Innovative gamma-ray Instrument for Space | 2002 | INFN-TC-02-01.pdf | M. Prest, M. Barbiellini, G. Bordignon, G. Fedel, L. Liello, F. Longo, C. Pontoni, E. Vallazza | AGILE (Light Imager for Gamma-ray Astrophysics) is the first small scientific mis-sion of ASI, the Italian Space Agency. It is a light (100 kg for the scientific instrument) satellite for the detection of gamma-ray sources in the energy range 30 MeV - 50 GeV within a large field of view (1/4 of the sky). It is planned to be operational in the years 2003-2006, a period in which no other gamma-ray mission in the same energy range is foreseen. AGILE is made of a silicon tungsten tracker, a CsI(Tl) minicalorimeter (1.5 X0), an anticoincidence system of segmented plastic scintillators and a X-ray imaging detector sensitive in the 10-40 keV range. The tracker consists of 14 planes, each of them made of two layers of 16 single-sided, AC coupled, 410 µm thick, 9.5x9.5 cm 2 silicon detectors with a readout pitch of 242 µm and a floating strip. The readout ASIC is the TAA1, an analog-digital, low noise, self triggering ASIC used in a very low power configuration ( _ 400 µW/channel) with full analog readout. The trigger of the satellite is given by the tracker. The total number of readout channels is around 43000. We present a detailed description of the tracker, its trigger and readout logic, its assembly procedures and the prototype performance in several testbeam periods at the CERN PS. |
| 4693 | 2001-12-20 | Impressioni e Considerazioni dal Winter Meeting 2001 dell’American Nuclear Society, Reno, Nevada, USA: EBR-I e 'Cinquantenario' della Produzione di Energia Elettronucleare, Trasmutazione di Scorie Nucleare, Impieghi Avanzati degli Acceleratori, Reattori e Trasmutatori a Metalli Liquidi, Applicazioni Biomediche ed Industriali dei Radionuclidi e delle Radiazioni Ionizzanti | 2001 | INFN-TC-01-21.pdf | M. Bonardi, Hae Song Mainardi, F. Groppi, D.Barni, P. Michelato, C. Pagani, D. Sertore | In this report we review the main topics discussed during the annual Winter Meeting of the American Nuclear Society, ANS, held in Reno, Nevada, USA, on November 10-16, 2001. A brief historical review is presented of the early produced electricity by the Experimental fast Breeder Reactor-I of the Idaho National Engineering and Environmental Laboratory, INEEL, presently site of Department of Energy, DOE, USA. Some definition and neutronic parameters involved in thermal and fast breeder nuclear rector technolgy are reported in some details. The possible applications of Accelerator Driven System (ADS) technology using high-energy and high-intensity proton accelerator for Nuclear Transmutation of rad-waste are reported. Some relevant concepts regarding nuclear reactor cooling by liquid metals, like Pb-Bi eutectic (LBE) and chemical-physical data concerned are discussed also. The use of nuclear energy could lead to an almost complete substitution of presently used fossil fuels like coal, oil and methane, with the highly echo-compatible 'hydricity' coming from the use of 'liquid hydrogen', as ultimate clean fuel for energy production and any kind of transportation vehicle. Some space is devoted to show that hydrogen fuel presents either less or comparable hazardness than more common gaseous fuels like methane and propane. The Hindenburg tragedy was due to the high flammability of the envelope of the Zeppelin air-ship and not to the presence of huge amouts of hydrogen gas itself. Finally, several non-energetic applications of radionuclides and radioactivity in industry, research and life sciences are presented. |
| 4694 | 2001-12-20 | Thin-Target Excitation Functions and Optimised Thick-Target Yields for natMo(p,xn)94g,95m,95g,96(m+g)Tc Nuclear Reactions Induced by Protons from Threshold up to 45 MeV. Radiochemical Separation and Quality Control | 2001 | INFN-TC-01-22.pdf | C. Birattari, M. Bonardi, F. Groppi, E. Sabbioni | This work describes the method adopted in our laboratories, to produce 94gTc, 95gTc, 95mTc and 96gTc radionuclides via proton-cyclotron irradiation on molybdenum targets of natural isotopic composition. Experimental thin-target excitation functions and 'effective' cross-sections for direct natMo(p,xn)ATc [with A=94,95,95,96] nuclear reactions, with incident proton energy in the range from threshold up to 44 MeV, are reported. Some definition of the equations used and nuclear data traceability are reported. Thick-target yield values, have been calculated and optimized, by numerical fitting and integration of the measured excitation functions. These values allow the optimization of the production yield of one radionuclide, minimizing at the same time the yield of the others. A novel radiochemical separation on NCA technetium radionuclides from both molybdenum target and niobium, zirconium and yttrium radioactive by-products is reported. Quality control tests of the radiotracer produced, were developed for the applications envisaged in environmental metallo-biochemical toxicology. |
| 3578 | 2001-12-19 | Effetti Indotti dall'Acqua Pesante (Come Tale e in Associazione a Raggi X) su Cellule Tumorali Umane Coltivate “in Vitro” | 2001 | LNF-01-030(IR).pdf | C. Catena, D. Pomponi, S. Pane, G. Trenta, E. Righi, F. Celani, P. Marini, M. Nakamura | Questo studio esamina l’effetto citotossico dell’acqua pesante (D2O), sterilizzata con raggi g da 60Co, presente nella coltura 'in vitro' di una linea di cellule tumorali umane (U937). Viene inoltre esaminata l’azione citotossica dei raggi X singolarmente o combinati con la D2O. Sono stati indagati: la sopravvivenza cellulare (MTT test), la genotossicità (test dei micronuclei), la morte cellulare programmata (apoptosi). I dati sperimentali, da considerarsi preliminari, confermano la trasferibilità delle metodologie da noi impiegate nella misura degli effetti biologici della D2O. Concentrazioni della D2O fino al 5% sono da considerarsi compatibili con la funzionalità cellulare. Una concentrazione di oltre il 20% di D2O produce, in questa linea cellulare, una marcata letalità (sopravvivenza <10%). L’effetto combinato (D2O + raggi X) pone in evidenza un probabile effetto radioprotetivo sulla sopravvivenza cellulare da parte della D2O, almeno in corrispondenza della dose di 2Gy. Il solo trattamento con la D2O non modifica la frequenza dei micronuclei e l’apoptosi. Trattamenti combinati con raggi X (2Gy) sembrano confermare il probabile effetto radioprotettivo della D2O al 4% e al 10%. L’effetto citotossico della D2O appare dunque promettente per possibili applicazioni in oncologia in funzione della sua azione di blocco del ciclo replicativo e per la letalità cellulare. E’ in corso un più ampio studio di approfondimento su linee cellulari normali e su alcune linee cellulari tumorali di diverso istotipo. Abstract This study examines the cytotoxic effect of combined treatment of heavy water (D2O), sterilized by g rays from 60Co source, and X rays on human lymphoma cell line (U937) cultivated 'in vitro'. The end-points are cellular survival (MTT test), micronucleus induction (CB technique) and apoptosis. The preliminary data confirm the feasibility of the tests for the measure of the radiobiological effects. D2O concentrations up to 5% are totally compatible with the development of cellular culture (duplication kinetic). A concentration beyond 20% produces, in this line, a strong letality (survival <10%). After 2Gy of treatment the addition of 4% or 10% of D2O induces a possible radioprotective effect. The cytotoxic effect of the D2O, for its blocking action on the cell cycle, seems to be promising for applications in oncology. A study on healthy and on neoplastic primary cellular lines is now curried out by our research group. |
| 3577 | 2001-11-30 | NERONE: First Tests in Sea Water | 2001 | LNF-01-029(NT).pdf | M. Cordelli, R. Habel, A. Martini, L. Trasatti | We have built a prototype of a new instrument designed to measure with high accuracy and without any bias the attenuation length of light in clean water (NERONE). The instrument has been tested for the first time at low depth in the sea during a cruise on the CNR oceanographic ship THETIS on November 6, 2001, and its performance was satisfactory |
| 4692 | 2001-11-30 | Envelope Solitons Versus Solitons | 2001 | INFN-TH-01-04.pdf | R. Fedele | A theory involving a correspondence between envelope solitonlike solutions of the generalized nonlinear Schrödinger equation (GNLSE) and solitonlike solutions of the generalized Korteweg-de Vries equation (GKVdE) is developed within the context of the Madelung's fluid description (fluid counterpart description of the GNLSE). This correspondence, which, under suitable constrains, can be made invertible, seems to be very helpful for finding one family of solutions (whether envelope solitonlike solutions of the GNLSE or solitonlike solutions of the GKdVE) starting from the knowledge of the other family of solution (whether solitonlike solutions of the GKdVE or envelope solitonlike solutions of the GNLSE). The theory is successfully applied to a wide classes of both modified nonlinear Schrödinger equation (MNLSE) and modified Korteweg-de Vries equation (MKVdE), for which bright and gray/dark solitonlike solutions are found. In particular, bright and gray/dark solitary waves are determined for the MNLSE with a quartic nonlinear potential in the modulus of the wavefunction (i.e. $q_1|\Psi|^2+q_2|\Psi|^4$) as well as for the associated MKdVE. Furthermore, the well known bright and gray/dark envelope solitons of the cubic NLSE and the corresponding solitons of the associated standard KdVE are easily recovered from the present theory. Remarkably, this approach opens up the possibility to transfer all the know how concerning the instability criteria for solitonlike solutions of the MKdVE to the instability theory of envelope solitonlike solutions of the MNLSE. |
| 4688 | 2001-11-28 | A Rapid Improved Method for Gamma-Spectrometry Determination of Thallium-202 Impurities, in [Thallium-201]Labelled Radiopharmaceuticals | 2001 | INFN-TC-01-18.pdf | F. Groppi, M. Bonardi, C. Birattari, L. Gini, M. Severgnini, C. Mainardi | In despite of the cyclotron production method and the efficiency of radiochemical processing adopted, the long–lived radioisotopic impurity 202Tl is always present in [201Tl]labelled radiopharmaceuticals (RP) together with other short-living impurities like, 200Tl. A rapid determination of 202Tl impurity, is carried out by HPGe gamma spectrometry of 201Tl samples, shielded by a 5 mm thick envelope of lead. DT correction errors, random pile-ups, Compton continuum and X-ray fluorescence background, are very efficiently avoided and suppressed. Some experimental results on DT correction performances of a commercial HPGe counting chain are reported. The method described allows determination of 202Tl impurities in 201Tl radiopharmaceuticals with high sensitivity and short counting times. The same method could be applied in Nuclear Medicine routine, to determine 201Tl radioisotopic purity by means of a ionization chamber dose calibrator. |
| 3576 | 2001-11-13 | Measurements of Magnetic Field in the Prototype of the OPERA Spectrometer | 2001 | LNF-01-028(IR).pdf | G. Di Iorio, B. Dulach, M. Incurvati, M. Spinetti, F. Terranova, L. Votano | Measurements of magnetic fields in the prototype of the OPERA spectrometer are re-ported. Both the magnetic flux B in the iron and the fringe field in air have been measured by means of pick up coils and Hall probes. These measurements are aimed to the deter-mination of the value of B in the bulk of the spectrometer for different currents and test the magnetic properties of the material in a full-scale prototype. Moreover, comparisons with simulations based on finite-element analysis have been carried out. |
| 3575 | 2001-11-12 | Rivelazione Acustica di Particelle - RAP Proposal | 2001 | LNF-01-027(IR).pdf | S. Bertolucci, M. Cirillo, E. Coccia, A. de Waard, D. Di Giocacchino, V. Fafone, G. Fossati, A.J. Lobo, A. Marini, G. Mazzitelli, V. Merlo, I. Modena, G. Modestino, L. Pellegrino, G. Pizzella, L. Quintieri. G. Raffone, F. Ronga, R. Russo, P. Tripodi, P. Valente | In order to investigate the anomalous results obtained in the analysis of the gravitational wave resoanant detector NAUTILUS data in coincidence with cosmic ray showers, we propose to measure the effect of the passage of charged particles in a low temperature mechanical oscillator in a controlled environment, using the DA{\Phi}NE electron Beam Test Facility at LNF. |
| 3574 | 2001-11-08 | The Finuda Experiment: Status and Perspectives | 2001 | LNF-01-026(P).pdf | M. Bertani | FINUDA is a hypernuclear physics experiment that will be carried out at DA$\Phi$NE, the $e^+e^-$ \FI-factory currently in operation at the INFN Frascati Laboratory. The apparatus, which is assembled in the DA$\Phi$NE hall, consists of a magnetic spectrometer with high resolution tracking capabilities. In this paper the status of the experiment is presented, together with the main features of the apparatus and of its physics program. |
| 4686 | 2001-11-05 | Calibration of the CLTS and Verification of the Standard for the PT100 Temperature Sensors for the B0 Model Coil | 2001 | INFN-TC-01-17.pdf | F. Broggi, A. Paccalini, G. Rivoltella | In this paper the LASA calibration facility for the temperature sensors is described. After an overview of the most widely used temperature sensors in cryogenic applications, the calibration curves of some CLTS and Pt100 installed on the B0 model coil are reported and discussed. Then, by general considerations and from the specific results, the accuracy of every type of sensor is discussed. Good reading electronics is needed for accurate temperature measurements, especially for the Cryogenic Linear Temperature Sensors (CLTS). For CLTS the calibration is mandatory if used at low temperature. It is recommended to verify the characteristics of the Pt100, in order to check the standard of the sensors, either USA or EU. The calibration is necessary if good accuracy in the measurements is required and is anyway necessary if Pt100 are used at low temperature (below 60 K). |
| 4690 | 2001-11-05 | New Localized Superluminal Solutions to the Wave Equations with Finite Total Energies and Arbitrary Frequecies | 2001 | INFN-FM-01-2.pdf | M. Zamboni-Rached, E. Recami, H.E. Hernadez-Figueroa | By a generalized bidirectional decomposition method, we obtain new Superluminal localized solutions to the wave equation (for the electromagnetic case, in particular) which are suitable for arbitrary frequency bands; various of them being endowed with finite total energy. We construct, among the others, an infinite family of generalizations of the so-called X-shaped waves. Results of this kind may find application in the other fields in which an essential role is played by a wave-equation (like acoustics, seismology, geophysics, etc.) |
| 3573 | 2001-10-26 | Annual Report 2000 | 2001 | LNF-01-025(IR).pdf | AA.VV. | |
| 4685 | 2001-10-24 | The Argo Level-I DAQ System | 2001 | INFN-TC-01-16.pdf | A. Aloisio, A. Anastasio, S. Catalanotti, S. Cavaliere, V. Masone, S. Mastroianni, P. Parascandolo | The ARGO-YBJ experiment has been designed in order to study the cosmic rays, mainly cosmic gamma-radiation, at an energy threshold of ~100 GeV, by means of the detection of small size air showers. This goal will be achieved by operating a full coverage array detector in the Yangbajing Laboratory (Tibet, China) at 4300 m a. s. l. |
| 4684 | 2001-10-23 | The Argo Memory Board | 2001 | INFN-TC-01-15.pdf | A. Aloisio, S. Cavaliere, P. Di Meo, V. Masone, S. Mastroianni, L. Parascandolo, P. Parascandolo | This note describes the ARGO Memory Board module designed to be used within the Data Acquisition (DAQ) system of the ARGO detector at Yanbajng (Lhasa, Tibet) |
| 4683 | 2001-10-11 | RFSC Cavities for the Detection of Gravitational Waves: Recent Updates and Future Trands | 2001 | INFN-TC-01-14.pdf | Ph. Bernard, A. Chincarini, G. Gemme, R. Parodi, E. Picasso | The last experimental results obtained on a detector of small harmonic displacemens, based on two coupled superconducting cavities, are presented. Starting from these results, and from a deeper understanding of the detector's working principles, new ideas for the development of a realistic gravitational waves detector, based on superconducting cavities, are discussed. The outline of the detector design and of its expected final sensitivity are also shown. |
| 4681 | 2001-07-24 | Indirectly Cooled Superconducting Dipole for a Ion Gantry | 2001 | INFN-TC-01-13.pdf | M. Conte, P. Fabbricatore, S. Farinon, F. Gerardi, R. A. Laurenti, R. Musenich, P. Negri, M. Perrella, C. Priano, S. Rebora, L. Reina, S. Rossi, S. Squarcia, P. Zadaricchio | |
| 4679 | 2001-07-17 | A Polarizability Model of the Emission from Ceramic Cathods | 2001 | INFN-TC-01-12.pdf | I. Boscolo, S. Cialdi | We show that properly electroded ceramic disks are strong and robust electron emitters when excited with short voltage pulses. We present in the article a phenomenological view of the processes which is capable of explaining all the experimental observations. |
| 4680 | 2001-07-17 | A Statistical Approach to Leptonic Mixing and Neutrino Masses | 2001 | INFN-TH-01-03.pdf | F. Vissani | |
| 3572 | 2001-07-11 | A Syncytiun Model for the Interpretation of the Phenomenon of Anomalous Light Flashes Occuring in the Human Eye During Space Missions | 2001 | LNF-01-024(IR).pdf | P. Maponi, M. Ricci, B. Spataro, F. Zirilli | A syncytium model to study some electrical properties of the eye is proposed in the attempt to explain the phenomenon of anomalous Light Flashes (LF) perceived by astronauts in orbit. Recent experiments, placed on board the Russian Space Station MIR have investigated the possible causes and have attempted to explain the physical processes and their relation with Cosmic rays. We discuss a mathematical model of some electrical properties of the eye (i.e. the crystalline lens modelled as a spherical syncytium), that is a boundary value problem for a system of two coupled elliptic partial differential equations in two unknowns. We use a numerical method to compute an approximate solution of this mathematical model and we show some numerical results that provide a possible (qualitative) explanation of the observed LF phenomenon. |
| 4678 | 2001-07-09 | Low Consumpion Charge Amplifiers for the Time of Flight Detector of the PAMELA Experiment | 2001 | INFN-TC-01-11.pdf | P. Di Meo, M. Di Pietro, P. Parascandolo | An important requirement for the Time of Flight (TOF) electronics of the PAMELA satellite detector is the low power consumption. We have designed two possible charge amplifiers which provide accurate measurements while keeping power absorption suitably low. |
| 3571 | 2001-07-05 | DAFNE Status | 2001 | LNF-01-023(P).pdf | DAFNE Team | No Abstract |
| 4665 | 2001-07-02 | Design of Pulse Stretchers for the Time of Flight Detector of the PAMELA Experiment | 2001 | INFN-TC-01-10.pdf | P. Di Meo, M. Di Pietro, P. Parascandolo | In this note we describe the design and the performance of two possible pulse stretchers to be used in the electronics readout chain of the Time of Flight (TOF) scintillators of the PAMELA experiment. |
| 4663 | 2001-06-30 | Report on the INFN - GRID Globus Evaluation | 2001 | INFN-TC-01-09.pdf | Roberto Alfieri, Cosimo Anglano, Roberto Barbera, Massimo Biasotto, Piergiorgio Cerello, Andrea Chierici, Andrea Controzzi, Flavia Donno, Tiziana Ferrari, Luigi Fonti, Antonio Forte, Luciano Gaido, Francesco Giacomini, Alberto Gianoli, Claudio Grandi, Andrea Guarise, Ivano Lippi, Giuseppe Lo Biondo, Stefano Lusso, Lorenzo Marzola, Francesco Prelz, Silvia Resconi , Carlo Rocca , Franco Semeria , Andrea Sciabà , Massimo Sgaravatto, Fabio Spataro, Gennaro Tortone, Giulia Vita Finzi , Zhen Xie | This are port on the Globus soft ware evaluation activities that have taken place within the INFN-GRID project (INFN-GRIDWorkPackage1). |
| 4662 | 2001-06-21 | Controllo ad Isteresi di Convertitori a Commutazione Mutuamente Accoppiati | 2001 | INFN-TC-01-08.pdf | F. Montecassiano | Il crescente impiego di apparecchiature elettroniche, sia nei laboratori di ricerca che a livello industriale e domenstico, ha evidenziato il problema dell’inquinamento armonico prodotto dalle interfacce di alimentazione poste tra le apparecchiature e la rete di distribuzione dell’energia elettrica. Le interfacce, nel convertire l’energia prelevata dalla rete nella forma più adatta all’applicazione, possono assorbire correnti fortemente impulsive in grado di produrre distorsioni della tensione di rete ed emissioni di disturbi elettromagnetici capaci di compromettere il corretto funzionamento di altri apparati elettrici. La riduzione dell’inquinamento armonico può essere ottenuta mediante tecniche di conversione dell’energia ad elevato fattore di potenza (power factor controller – PFC), tramite le quali l’assorbimento di corrente diviene praticamente sinusoidale ed in fase con la tensione di rete, ovvero a basso contenuto armonico. Un interessante sistema di conversione PFC prevede la connessione interleaved di due celle switching di tipo boost, funzionanti in continuous conduction mode con controllo ad isteresi di corrente e mutuamente accoppiate. Tale sistema è in grado di compiere un aggiustamento autonomo degli istanti di commutazione delle singole celle verso un regime vicino all’opposizione di fase, ottenendo un miglioramento del fattore di potenza complessivo. Questo lavoro, dopo un’attenta analisi sul comportamento del sistema descritto, propone un modello di tipo Phase Locked Loop che permette previsioni sulla frequenza e sulla fase di regime dei convertitori con controllo ad isteresi componenti il sistema interleaved; in questo senso, il modello proposto risulta un valido strumento nel progetto di nuovi sistemi PFC. |
| 3554 | 2001-06-01 | Evidence for a narrouw dip structure at 1.9 GeV/ c^2 in 3pi^+3p^- Diffractive Photoproduction | 2001 | LNF-01-022(P).pdf | A. Zallo for E687 Collaboration: P.L. Frabetti, H.W.K. Cheung, J.P. Cumalat, C. Dallapiccola, J.F. Ginkel, W.E. Johns, M.S. Nehring, E.W. Vaandering, J.N. Butler, S. Cihangir, I. Gaines, P.H. Garbincius, L. Garren, S.A. Gourlay, D.J. Harding, P. Kasper, A. Kreymer, P. Lebrun, S. Shukla, M. Vittone, R. Baldini-Ferroli, S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, R. Culbertson, R.W. Gardner, E. Gottschalk, R. Greene, K.Park, A. Rahimi, J. Wiss, G. Alimonti, G. Bellini, M. Boschini, D. Brambilla, B. Caccianiga, L. Cinquini, M. DiCorato, P. Dini, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, E. Meroni, L. Milazzo, L. Moroni, D. Pedrini, L. Perasso, F. Prelz, A. Sala, S. Sala, D. Torretta , D. Buchholz, D. Claes, B. Gobbi, B. O’Reilly, J.M. Bishop, N.M. Cason, C.J. Kenned, G.N. Kim, T.F. Lin, D.L. Puseljic, R.C. Ruchti, W.D. Shephard, J.A. Swiatek, Z.Y. Wu, V. Arena,G. Boca,G. Bonomi, C. Castoldi, G. Gianini, M. Merlo, S.P. Ratti, C. Riccardi, L. Viola, P. Vitulo, A.M. Lopez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, J.E. Ramirez, C.Rivera , Y. Zhang, J.M. Link, V.S. Paolone, P.M. Yager , J.R. Wilson, J. Cao, M. Hosack, P.D. Sheldon, F. Davenport, K. Cho, K. Danyo, T. Handler, B.G. Cheon, Y.S. Chung, J.S. Kang, K.Y. Kim , K.B. Lee, S.S. Myung | A narrow dip structure has been observed at 1.9 GeV/c^2 in a study of diffractive photo-production of the 3pi^+ 3 pi^- final state performed by the Fermilab experiment E687. |
| 4660 | 2001-05-28 | The 2 RF-Cavities Parametric Amplifier | 2001 | INFN-TC-01-07.pdf | M. Conte, G. Gemme, M. Palazzi and R. Parodi | We shall illustrate a parametric amplifier, made of two coupled RF cavities, whose non-linear element is given by the Stern-Gerlach interaction between a polarized beam and a TE RF cavity, tuned in a suitable way. An experimental verification is suggested to be carried out at the South Hall Ring of MIT-Bates. |
| 3570 | 2001-05-21 | Scalar sigma meson effects in rho and omega decays | 2001 | LNF-01-021(P).pdf | A. Bramon , R. Escribano , J.L. Lucio M. , M. Napsuciale | The complementarity between Chiral Perturbation Theory and the Linear Sigma Model in the scalar channel is exploited to study $\pi^0 \pi^0$ production in \rho and \omega radiative decays, where the effects of a low mass scalar resonance \sigma (500)should manifest. The recently re-ported data on $\rho to \pi^0 \pi^0 \gamma$ seem to require the contribution of a low mass and moderately narrow $\sigma(500)$. The properties of this controversial state could be fixed by improving the accuracy of these measurements. Data on $\omega to \pi^0 \pi^0 \gamma $ can also be accommodated in our framework, but are much less sensitive to the \sigma(500) properties. |
| 4659 | 2001-05-11 | The Agile Silicon Tracker: Architectural Design and Prototype Test Beam Results | 2001 | INFN-TC-01-06.pdf | G. Barbiellini, G. Fedel, F. Liello, F. Longo, C. Pontoni, M. Prest, M. Tavani, E. Vallazza | AGILE (LightImagerforGamma-rayAstrophysics) is a small scienti¹c satellite for the detection of cosmicg-ray sources in the energy range 30 MeV-50 GeV with a very large ¹eld of view (1/4 of the sky). It is planned to be operational in the years 2003-2006, a period in which no other $gamma$-ray mission in the same energy range is foreseen. The AGILE scienti¹c instrument is made of a silicon-tungsten Tracker, aCsI(Tl) Minicalorimeter, an Anticoincidence system and a X-ray imaging detector sensitive in the 10-40keV range. We present here a detailed description of the architectural design of the Silicon. Tracker with it strigger and readout logic, and the performance of the detector prototype during a test beam period at the CERN PS in May 2000. The Tracker performance is described in terms of position resolution and signal to noise ratio for on-axis and off-axis incident charged particles. The measured 40 &mu&m resolution for a large range of incident angles will provide an excellent angular resolution for cosmic $gamma$-ray imaging. |
| 3569 | 2001-05-04 | Vibrating Sample Holder for X-Ray Absorption Measurements on Single Crystals | 2001 | LNF-01-020(NT).pdf | V. Tullio, F. D'Anca, F. Campolungo, F. D’Acapito, F. Boscherini, S. Mobilio | This technical note reports on the design, construction and performance of a vibrating sample holder in use on the GILDA - CRG beamline at the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. It permits to minimize the effects of coherent scattering (Bragg Scattering) when measuring the x-ray absorption coefficient of single crystals. |
| 4658 | 2001-04-30 | Unified Time Analysis of Photon and (Nonrelativistic) Particle Tunnelling, and the Superluminal Group-Velocity Problem | 2001 | INFN-FM-01-1.pdf | V.S. Olkhovsky, E. Recami, J. Jakiel | A unified approach to the time analysis of tunnelling of nonrelativistic particles is presented, in which Time is regarded as a quantum-mechanical observable, canonically conjugated to Energy. The validity of the Hartman effect (independence of the Tunnelling Time of the opaque barrier width, with Superluminal group velocities as a consequence) is verified for all the known expressions of the mean tunnelling time. Moreover, the analogy between particle and photon tunnelling is suitably exploited. On the basis of such an analogy, an explanation of some recent microwave and optics experimental results on tunnelling times is proposed. Attention is devoted to some aspects of the causality problem for particle and photon tunnelling. |
| 3565 | 2001-04-23 | The Tracking Detector to the KLOE Experiment | 2001 | LNF-01-016(P).pdf | The KLOE Collaboration: M. Adinolfi, F. Ambrosino, A. Andryakov, A. Antonelli, M. Antonelli, C. Bacci, R. Baldini-Ferroli, A. Bankamp, F. Bellini, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini,, S. A. Bulychjov, G. Cabibbo, A. Calcaterra, R. Caloi, P. Campana, G. Capon, A. Cardini, M. Casarsa, V. Casavola, G. Cataldi,, F. Ceradini, F. Cervelli, G. Chiefari, P. Ciambrone, E. De Lucia, R. De Sangro, P. De Simone, S. Dell’Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, E. Drago, G. Felici, A. Ferrari, M. L. Ferrer, G. Finocchiaro, G. Fischer, C. Forti, A. Franceschi, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, V. Golovatyuk, E. Gorini, F. Grancagnolo, E. Graziani,, M. Incagli, L. Ingrosso, Y. Y. Jiang, W. Kluge, V. Kulikov, C.Kuo, F. Lacava, G. Lanfranchi, J. Lee-Franzini, T. Lomtadze, C. Luisi, M. Martemianov, M. Matsyuk, W. Mei, A. Menicucci, R. Messi, S. Moccia, M. Moulson, S. M¨uller, F. Murtas, M. Napolitano, A. Nedosekin, L. Pacciani, P. Pa g`es, M. Palutan, M. Panareo, L. Paoluzi, E. Pasqualucci, L. Passalacqua, M. Passaseo, A. Passeri,, V. Patera, E. Petrolo, G. Petrucci, D. Picca, M. Piccolo, G. Pirozzi, M. Pollack, L. Pontecorvo, M. Primavera, E. Santovetti, G. Saracino, F. Sch¨ onleber, B. Sciascia, A. Sciubba, I. Sfiligoi, T. Spadaro, S. Spagnolo, E. Spiriti, U. von Hagel, P. Valente, B. Valeriani, G. Venanzoni, S. Veneziano, A. Ventura | The design and construction of the large Drift Chamber for the KLOE experiment at the Frascati phi-factory, DAPHNE, are described. The relevant aspects of the various elements of the detector are reviewed together with a description of the track reconstruction program and of the calibration procedures. The performance of the detector based on measurements with cosmic rays and with e+ e- colliding beams during DAPHNE commissioning is presented. |
| 3566 | 2001-04-23 | The KLOE Electromagnetic Calorimeter | 2001 | LNF-01-017(P).pdf | The KLOE Collaboration: M. Adinolfi, F. Ambrosino, A. Antonelli, M. Antonelli, F. Anulli, G. Barbiellini, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, G. Cabibbo, R. Caloi, P. Campana, M. Casarsa, G. Cataldi, F. Ceradini, F. Cervelli, P. Ciambrone, E. De Lucia, P. De Simone, G. De Zorzi, S. Dell’Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, O. Erriquez, A. Farilla, A. Ferrari, M. L. Ferrer, G. Finocchiaro, C. Forti, A. Franceschi, P. Franzini, M. L. Gao, C. Gatti, P. Gauzzi j , A. Giannasi i , S. Giovannella, E. Graziani, H. G. Han, S. W. Han, X. Huang, M. Incagli i , L. Ingrosso, L. Keeble, W. Kim, C.Kuo, G. Lanfranchi, J. Lee-Franzini,c;m T. Lomtadze i ,C. S. Mao, M. Martemianov, W. Mei, R. Messi, S. Miscetti, S. Moccia, M. Moulson, S. Muller, F. Murtas, L. Pacciani, M. Palomba, M. Palutan, E. Pasqualucci, L. Passalacqua, A. Passeri, D. Picca, G. Pirozzi, L. Pontecorvo, M. Primavera, P. Santangelo, E. Santovetti, G. Saracino, R. D. Schamberger, B. Sciascia, F. Scuri, I. Sfiligo, P. Silano, T. Spadaro, E. Spiriti, L. Tortora, P. Valente, B. Valeriani, G. Venanzoni, A. Ventura, S.Wolfle, Y.Wu, Y.G. Xie, P.F. Zema, C.D. Zhang, J.Q. Zhang, P. P. Zhao | The KLOE detector was designed primarily for the study of CP violation in neutral kaon decays at DAPHNE, the Frascati phi-factory. The detector consists of a tracker and an electromagnetic calorimeter. A lead-scintillating-fiber sampling calorimeter satisfies best the requirements of the experiment, providing adequate energy resolution and superior timing accuracy. We describe in the following the construction of the calorimeter, its calibration and how the calorimeter information is used to obtain energy, point of entry and time of arrival of photons, electrons and charged particles. With e+ e - collision data at DAPHNE for an integrated luminosity of some 2 pb-1 we find for electromagnetic showers, an energy resolution of 5.7%/sqrtE (GeV) and a time resolution of 54/sqrt(GeV) ps. We also present a measurement of efficiency for low energy photons. |
| 3567 | 2001-04-23 | The QCal Tile Calorimeter of KLOE | 2001 | LNF-01-018(P).pdf | The KLOE Collaboration: M. Adinolfi, F. Ambrosino, M. Antonelli, C. Bini, V. Bocci, F. Bossi, P. Branchini, G. Cabibbo, R. Caloi, G. Carboni, M. Casarsa, G. Cataldi, P. Ciambrone, S. Conetti, E. De Lucia, P. De Simone, S. Dell’Agnello, A. Denig, A. Di Domenico, C. Di Donato, S. Di Falco, A. Doria, A. Ferrari, G. Finocchiaro, C. Forti, A. Franceschi, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Graziani, M. Incagli, C.Kuo, G. Lanfranchi, M. Martemianov, W. Mei, R. Messi, S. Moccia, M. Moulson, S. Muller, C.T. Murphy, F. Murtas, L. Pacciani , M. Palutan, E. Pasqualucci, L. Passalacqua, A. Passeri, D. Picca, G. Pirozzi, L. Pontecorvo, M. Primavera, E. Santovetti, G. Saracino, B. Sciascia, I. Sfiligoi, T. Spadaro, E. Spiriti, P. Valente c , B. Valeriani, G. Venanzoni, A. Ventura | The quadrupole tile calorimeters of KLOE (QCAL) are two compact detectors placed close to the interaction point and surrounding the focusing quadrupoles. Their purpose is to increase the hermeticity of KLOE calorimetry. Each QCAL consists of a sampling structure of lead plates and scintillator tiles with wavelength shifter (WLS) fibers and mesh photomultiplier readout arranged in 16 azimuthal sectors. The arrangement of WLS fibers allows the measurement of the longitudinal position of the showers from time of flight (TOF). In this paper we describe the QCAL design and assembly and present preliminary results obtained with both cosmic rays and photons from KL decays. The time and energy calibration procedures are also discussed in detail. |
| 3568 | 2001-04-23 | L’Apparato dell’Esperimento SFERA dei LNF | 2001 | LNF-01-019(NT).pdf | L. Cacciotti, L. Catani, R. Sorchetti, F. Tazzioli | E’ descritto l’apparato dell’esperimento SFERA del Gruppo V presso i LNF, che ha per scopo lo studio di foto emettitori robusti per i catodi degli acceleratori lineari avanzati di elettroni che trovano applicazione nei colliders e nei FEL. Sono illustrati gli apparati di misura del rendimento quantico di emissione e della distribuzione temporale degli impulsi emessi. Vengono inoltre accennati i metodi di misura e di elaborazione dei dati. |
| 3564 | 2001-04-19 | Beam Loading Compensation Schemes for the Muon Recirculating Linacs of the CERN Neutrino Factory | 2001 | LNF-01-015(R).pdf | M. Ferrario, V. Fusco, M. Migliorati | A train of 100 muon bunches, 2.2 ms long, with an average current of 0.1 A, has to be accelerated by the first recirculating linac (mRLA1) from 2 GeV up to 10 GeV (in 4 turns) with a rms relative energy spread se < 5 10^-3. Despite the huge amount of energy stored in the 352 MHz cavities adopted for this linac (~100 Joule @ 10 MV), the energy spread induced by beam loading effects without compensation results to be s_e=1.4 x10-2. We discuss in this note the results of a preliminary study about possible schemes for beam loading compensation in mRLA1. Simple scaling laws are derived by means of the phasor description of beam loading effects according to P. Wilson treatment. The code HOMDYN is used for multi-bunch computations whose main features are recalled in the appendix. |
| 4657 | 2001-04-19 | A Reliable Coaxial Feedthrough To Avoid Breakdown In Vertical Test Facilities For SC Cavity Measurements | 2001 | INFN-TC-01-05.pdf | A. Bosotti, G. Varisco | A common problem during the RF SC cavity tests in vertical cryostats is the breaking of coaxial feedthroughs due to sparking between the outer and inner coaxials. This paper shows a method to overcome this problem, together with the procedure employed to build the coaxial cable RF feedthrough |
| 4655 | 2001-04-06 | Il programma AirWatch ed il progetto EUSO | 2001 | INFN-AE-01-03.pdf | O. Catalano, G. D'Ali Staiti, S. Giarrusso, G. La Rosa, M.C. Maccarone, B. Sacco, L. Scarsi, F. Becattini, S. Bottai, A. Cartacci, D. Guetta, G. Landi, P. Mazzinghi, E. Pace, M. Romoli, M. Salvati, P. Sona, P. Spillantini, P.L. Tasselli, B. Tiribilli, G. Toci, S. Cuneo, D.De Marco, F. Fontanelli, F. Gatti, V. Gracco, P. Musico, M. Pallavicini, A. Petrolini, M. Sannino, G. Testera, M. Aglietta, G. Badino, P. Galeotti, P. Vallania, G. Giannini, A. Gregorio, R. Stalio | Il programma AirWatch riguarda l'osservazione dallo spazio degli sciami estesi di particelle prodotti nell'atmosfera da particelle cosmiche di altissima energia. Nell'ambito di tale programma si colloca il progetto EUSO, recentemente sottoposto all'ESA da una collaborazione internazionale. In questa nota si descrivono la problematica scientifica connessa con i raggi cosmici di altissima energia, le problematiche tecniche legate all'osservazione dallo spazio degli sciami atmosferici estesi e si descrivono le linee di una possibile partecipazione dell'INFN al programma AirWatch ed al progetto EUSO in particolare. |
| 4656 | 2001-04-06 | Study report on the \textit{EUSO} photo-detector design | 2001 | INFN-AE-01-04.pdf | M. Ameri, S. Cuneo, F. Fontanelli, V.Gracco, P. Musico, M. Pallavicini, A. Petrolini, F. Pratolongo and M. Sannino | The aim of this report is to summarize the $R\&D$ and the work done so far for the design of a photo-detector for a space experiment based on the AirWatch concept, focusing on the \textit{EUSO} project proposed to ESA for installation on the International Space Station. The main results will be summarized, solutions to some problems will be presented and the most critical items requiring further study will be identified. A realistic baseline scheme for the photo-detector, based on the presently known information and constraints, is proposed. The outcome of these studies can be used to estimate the performance of \textit{EUSO} and to provide input to further engineering studies. Finally an activity plan for the development of the photo-detector will be presented. |
| 4654 | 2001-04-05 | The Liquid Xenon set-up of the DAMA Experiment | 2001 | INFN-AE-01-02.pdf | R. Bernabei, P. Belli, A. Bussolotti, F. Cappella, R. Cerulli, C.J. Dai, A. Incicchitti, A. Mattei, D. Prosperi | The main features at the low background DAMA pure liquid Xenox scintillator setup running deep underground in the Gran Sasso National Laboratory of the INFN are described. |
| 4653 | 2001-04-02 | Masurio-99m, Masurio-99g, Renio-186g e Renio-188g: Radioelementi Chimici Isomorpi, ma con Aattivita’ Specifica e Proprieta’ Chimico-Fisiche Differenti. Storia e Pproduzione di Radio-Traccianti Metodiche di Produzione e Controllo di Qualita’ | 2001 | INFN-TC-01-04.pdf | Mauro Bonardi, Flavia Groppi | Masurium (Z=43) and rhenium (Z=75) have been discovered and chemically co-isolated in 1925, by a team of german chemists, made by Ida Tacke-Noddack, her husband Walter Noddack and Otto Carl von Berg, in uranium containing ores named "Platinerz" and "Columbite". Despite the evidence of this double discovery, as appears from the reading of their scientific publications of 1925 and 1934, only the discovery of stable rhenium was attributed to Ida Noddack’s equipe. They identified the element of Z=43 in 1925 by an X-ray spectrum only; thus the "discovery" of element 43 was not validated and then attributed to the italian and french scientists Emilio Segrè and Carlo Perrier in 1937. They named it technetium (Tc), from the greek word: tecnhto¢V (artificiale). The name "artificial" is clearly unsuitable for element 43. In fact, as Ida Noddack showed about 15 years before the discovery of fission by Otto Hahn, Lise Meitner, Otto Carl Frisch and Fritz Strabmann (1939), masurium is absolutely not an artificial element, but is present in any kind of natural ore containing uranium, together with many other natural fission and activation products. Presently, the radio-isomer of mass 99 of masurium (99mMa) and the two radionuclides of rhenium, 188gRe and 186gRe, are used extensively in Nuclear Medicine, the first for radiodiagnostics and the latter in radionuclide therapy. An historic review of the discovery of Ma and Re in 1925 is reported. Furthermore, original data on some proton-cyclotron production of masurium radionuclides, to be used in metallo-toxicology and environmental studies are reported. Radiochemical separation and quality control procedures are also shown in some details. Some definitions, useful in Nuclear and Radiochemistry are given and explained also. |
| 3562 | 2001-03-29 | Transition Radiation in the Pre-Wave Zone: An Approach to Solution | 2001 | LNF-01-013(P).pdf | V.A. Verzilov | An analytic approach to solution to the pre-wave zone problem is suggested for transition radiation produced by relativistic charged particles at the normal incidence on the infinite boundary between a metal and vacuum. |
| 3563 | 2001-03-29 | On the metastability of the Standard Model vacuum | 2001 | LNF-01-014(P).pdf | Gino Isidori, Giovanni Ridolfi, Alessandro Strumia | If the Higgs mass $m_H$ is as low as suggested by present experimental information, the Standard Model ground state might not be absolutely stable. We present a detailed analysis of the lower bounds on $m_H$ imposed by the requirement that the electroweak vacuum be sufficiently long lived. We perform a complete one-loop calculation of the tunnelling probability at zero temperature, and we improve it by means of two-loop renormalization-group equations. We find that, for $m_H=115$~GeV, the Higgs potential develops an instability below the Planck scale for $m_t>(166\pm 2) \GeV$, but the electroweak vacuum is sufficiently long lived for $m_t > (175\pm 2) \GeV$. |
| 4652 | 2001-03-26 | Relazione del Comitato per le Pari Opportunita’ dell’INFN Anno 2000 | 2001 | INFN-AM-01-01.pdf | R. Alba, L. Brogiato, S. Cappelli, O. Di Carlo, P. Fabbri, L. Fioretti, D. Muscolino, M.L. Paciello, G. Pancheri, P. Pilloni, P. Rufini, G. Ruggieri, P. Spolaore, C. Vannini | |
| 3561 | 2001-03-16 | Conceptual Design of the X-FEL Photo-Injector | 2001 | LNF-01-012(P).pdf | M. Ferrario, K. Flöttmann, B. Grigoryan, T. Limberg, Ph. Piot | In this report the conceptual design for the TELSA X-ray free-electron laser photoinjector is presented. Beam Dynamics, design and operational issue are addresses. |
| 4651 | 2001-02-28 | Proposta di Implementazione di Windows 2000 nell'INFN | 2001 | INFN-TC-01-03.pdf | G.P. Siroli, S. Zani, A.Baldini, R. Esposito, E. M.V. Fasanelli, R. Giacomelli, G. Peco, F. Taurino, A. Tirel | |
| 3560 | 2001-02-21 | Insights on Neutrino Lensing | 2001 | LNF-01-011(P).pdf | R. Escribano, J.-M. Frere, D. Monderen, V. Van Elewyck | We discuss the gravitational lensing of neutrinos by astrophysical objects. Unlike pho-tons, neutrinos can cross a stellar core; as a result, the lens quality improves. We also estimate the depletion of the neutrino flux after crossing a massive object and the signal amplification expected. While Uranians alone would benefit from this effect in the Sun, similar effects could be considered for binary systems. |
| 3559 | 2001-02-20 | A Heterotic N=2 String With Space-Time Supersymmetry | 2001 | LNF-01-010(P).pdf | S. Bellucci, A. Galajinsky, O. Lechtenfeld | We reconsider the issue of embedding space--time fermions into the four-dimensional N=2 world--sheet supersymmetric string. A new heterotic theory is constructed, taking the right--movers from the N=4 topological extension of the conventional N=2 string but a c=0 conformal field theory supporting target--space supersymmetry for the left--moving sector. The global bosonic symmetry of the full formalism proves to be U(1,1), just as in the usual N=2 string. Quantization reveals a spectrum of only two physical states, one boson and one fermion, which fall in a multiplet of (1,0) supersymmetry. |
| 4650 | 2001-02-16 | Dynamical CP Violation and FCNC Processes | 2001 | INFN-TH-01-01.pdf | G.C. Branco, D. Delepine, R. González Felipe | |
| 3558 | 2001-02-15 | Total Cross-Sections | 2001 | LNF-01-009(P).pdf | R.M. Godbole, A. Grau, G. Pancheri, Y.N. Srivastava | A unified approach to total cross-sections, based on the QCD contribution to the rise with energy, is presented for the processes $pp$, $p{\bar p}$, $\gamma p, \gamma \gamma, e^+e^- \rightarrow hadrons$. For proton processes, a discussion of the role played by soft gluon summation in taming the fast rise due to mini-jets is presented. For photon-photon processes, a comparison with other models indicates the need for precision measurements in both the low and high energy region, likely only with measurements at future Linear Colliders. |
| 3557 | 2001-02-06 | $\sigma^tot_2\gamma$ at e^+e^- Colliders | 2001 | LNF-01-008(P).pdf | R.M. Godbole, G. Pancheri | In this talk I briefly summarize different models for $\sigma^{tot}_{2 \gamma}$ ($e^+e^- \to \gamma \gamma \to$ hadrons) and contrast model predictions with the data. I will then discuss the capability of the future $e^+e^-$ and $\gamma \gamma$ colliders to distinguish between various models and end with an outlook for future work. |
| 3556 | 2001-02-02 | Towards the Complete N=2 Superfield Born-Infeld Action with Partially Broken N=4 Supersymmetry | 2001 | LNF-01-007(P).pdf | S. Bellucci, E. Ivanov, S. Krivonos | We propose a systematic way of constructing N = 2, d = 4 superfield Born-Infeld action with a second nonlinearly realized N = 2 supersymmetry. The latter, together with the manifest N = 2 supersymmetry, form a central-charge extended N = 4, d = 4 supersymmetry. We embed the Goldstone-Maxwell N = 2 multiplet into an infinite-dimensional off-shell supermultiplet of this N = 4 supersymmetry and impose an infinite set of covariant constraints which eliminate all extra N = 2 superfields through the Goldstone-Maxwell one. The Born-Infeld superfield Lagrangian density is one of these composite superfields. The constraints can be solved by iterations to any order in the fields. We present the sought N = 2 Born-Infeld action up to the 10th order. It encompasses the action found earlier by Kuzenko and Theisen to the 8th order from a self-duality requirement. This is a strong indication that the complete N = 2 Born-Infeld action with partially broken N = 4 supersymmetry is also self-dual. |
| 3553 | 2001-02-01 | Longitudinal Single-Bunch Instabilities | 2001 | LNF-01-005(P).pdf | M. Migliorati, L. Palumbo | After introducing the concepts of longitudinal wakefield and coupling impedance, we review the theory of longitudinal single-bunch collective effects in storage rings. From the Fokker-Planck equation we first derive the stationary solution describing the natural single-bunch regime, and then treat the problem of microwave instability, showing the different approaches used for estimating the threshold current. We end the lecture with the semi-empirical laws that allow us to obtain the single-bunch behavior above threshold, and with a description of the simulation codes that are now reliable tools for investigating all these effects. |
| 3555 | 2001-02-01 | Description and Operation of the DAGA2_HF Acquisition System for Gravitational Wave Detectors | 2001 | LNF-01-006(IR).pdf | Sabrina D’Antonio | The new acquisition system for the gravitational wave detectors of the $ROG$ group, $NAUTILUS$ in operation at the $INFN$ Laboratori Nazionali di Frascati and $EXPLORER$ at $CERN$, is described. The system, operating with a $5~kHz$ sampling rate, allows on-line data analysis for the search of impulsive excitations of the gravitational wave detectors. |
| 3552 | 2001-01-30 | Considerations on low frequency , high gradient cavities for muon capture and cooling | 2001 | LNF-01-004(NT).pdf | B. Spataro, F. Tazzioli | In this note we discuss some alternatives in the design of low frequency cavities for Muon capture and cooling in a Neutrino Factory. Both solutions with closed and open irises are considered. The comparison between the various solutions is based on dimensions and power per unit length, for a given accelerating gradient. |
| 4649 | 2001-01-19 | Investigating the DAMA Annual Modulation Data in a Mixed Coupling Framework | 2001 | INFN-AE-01-01.pdf | R. Bernabei, M. Amato, P. Belli,, R. Cerulli, C.J. Dai, H.L. He, A. Incicchitti, H.H. Kuang, J.M. Ma, F. Montecchia, D. Prosperi | In this paper the data, collected by the 100 kg NaI (Tl) DAMA set-up deep underground in the Gran Sasso National Laboratory of I.N.F.N. during four annual cycles (57986 kg·day statistics ), are analysed in term s of WIMP annu al modulation signature considering a candidate with mixed couplin g to ordin ary matter. |
| 3551 | 2001-01-18 | Technical Layout of the TESLA Damping Ring | 2001 | LNF-01-003(NT).pdf | C. Sanelli, G. Barbagelata, A. Bixio, R. Boni, G. Canepa, A. Clozza, G. Di Pirro, G.P. Ghelardi, M. Grattarola, S. Guiducci, A. Lutri, S. Patrone, S. Rizzo, M. Serio, F. Sgamma, A. Stecchi | The electron – positron linear collider TESLA will require two Damping Rings, where the 2820 bunches, with an energy of 5 GeV, will be compressed to obtain a bunch spacing of 20 ns. This bunch spacing fixes a Damping Ring length of 17 km. The major part of the damping ring will be installed in the linac tunnel; short return arcs, with a length of about 1.3 km each, will be installed in dedicated tunnels. This report describes the technical layout of one damping ring, developed in collaboration with Ansaldo Ricerche, in all its components: magnetic system (dipoles, quadrupoles, sextupoles, steerers, electromagnetic wigglers), RF system (cryo-modules, RF power sources), Vacuum system (vacuum chambers, pumps, valves), Beam diagnostics, Computer control system, Electrical services, Cooling system, etc. Drawings showing the detailed ring layout and also every component of the ring are included. |
| 4648 | 2001-01-18 | MEDISOFT Versione 2.2: Guida all’uso e file sorgente del programma per l’acquisizione di immagini con sensore Medipix | 2001 | INFN-TC-01-02.pdf | E. Bertolucci, M. Conti, G. Mettivier, M. C. Montesi, P. Russo | |
| 4647 | 2001-01-12 | Heat Dissipation Tests on the Titanium Junction Box of the ANTARES Experiment | 2001 | INFN-TC-01-01.pdf | M.Ameri, M.Anghinofi, P.Cocconi, S.Cuneo, R.Papaleo, F.Parodi, G.Raia, A.Rottura | The Junction Box is the part of the ANTARES project where the main electro optical cable from the shore is splitted into the 13 lines that power the detector strings. The different active components housed inside will produce a total amount of heat greater than 1 KW; it is therefore important to guarantee a good heat dissipation to avoid damages to the instrumentation due to local overheating. This report describes the test performed in our laboratory using the titanium box equipped with different heaters and submerged in a water bath at 15C to simulate the real conditions. The results have defined the optimal configuration in order to guarantee a safe margin with respect to the maximum temperature allowed by the instrumentation; simulations performed with the FEA code show good agreement with the measured temperatures. |
| 3550 | 2001-01-10 | The CP-Violating Asymmetry in K_L to pi^+pi^- e^+e^- | 2001 | LNF-01-002(P).pdf | G. Ecker, H. Pichl | We update the theoretical analysis of the CP-violating asymmetry in the decay $K_L \to \pi^+\pi^- e^+ e^-$, relying on chiral perturbation theory and on the most recent phenomenological information. With the experimentally determined magnetic amplitude and branching ratio as input, the asymmetry can be calculated with good accuracy. The theoretical interpretation of the sign of the asymmetry is discussed. |
| 3549 | 2001-01-09 | A Low Walk Double Threshold Discriminator for Gas Tracking Devices | 2001 | LNF-01-001(P).pdf | A. Balla, L. Benussi, M. Bertani, S. Bianco, G. Corradi, F. L. Fabbri, P. Gianotti, M. Giardoni, V. Lucherini, E. Pace, L. Passamonti, F. Pompili, V. Russo, S. Sarwar, S. Tomassini | A 9U VME like double threshold discriminator has been designed and constructed at Frascati INFN laboratories. Its aim is to process the signals arising from gas drift chambers, introducing a very small time walk ($\sim$ 650 ps). Each discriminator board houses 32 channels. Each channel is located on an independent printed circuit mounted on socket. This solution is very convenient for replacing faulty channels without loosing operation of the full board. |
| 3618 | 2000-12-22 | N=2 N=4 Supersymmetric Born-Infeld Theories from Non Linear Realizations | 2000 | LNF-00-040(P).pdf | S. Bellucci, E. Ivanov, S. Krivonos | Starting from nonlinear realizations of the partially broken central-charge extended $N=4$ and $N=8$ Poincar\'e supersymmetries in $D=4$, we derive the superfield equations of $N=2$ and $N=4$ Born-Infeld theories. The basic objects are the bosonic Goldstone $N=2$ and $N=4$ superfields associated with the central charge generators. By construction, the equations are manifestly $N=2$ and $N=4$ supersymmetric and enjoy covariance under another nonlinearly realized half of the original supersymmetries. They provide a manifestly worldvolume supersymmetric static-gauge description of D3-branes in $D=6$ and $D=10$. For the $N=2$ case we find, to lowest orders, the equivalence transformation to the standard $N=2$ Maxwell superfield strength and restore, up to the sixth order, the off-shell $N=2$ Born-Infeld action with the second hidden $N=2$ supersymmetry. |
| 4646 | 2000-12-21 | Status of the High Current Proton Accelerator for the Trasco Program | 2000 | INFN-TC-00-23.pdf | M. Napolitano for TRASCO Collaboration | |
| 3615 | 2000-12-19 | Results on Charmed Meson Spectroscopy from FOCUS | 2000 | LNF-00-037(P).pdf | F.L. Fabbri on behalf of the FOCUS Collaboration. Coauthors are: J.M. Link, V.S. Paolone, M. Reyes, P.M. Yager (UC DAVIS); J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, J.M. de Miranda, I.M. Pepe, A.C. dos Reis, F. Simão, S. Carrillo, E. Casimiro, H. Mendez, A.Sánchez-Hernández,, C. Uribe, F. Vasquez; L. Cinquini, J.P. Cumalat, J.E. Ramirez, B. O’Reilly, E.W. Vaandering, J.N. Butler, H.W.K. Cheung, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, S.A. Gourlay, P.H. Kasper, A.E. Kreymer, R. Kutschke, S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, D.Y. Kim, K.S. Park, A. Rahimi, J. Wiss, R. Gardner, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, S.S. Myung, H. Park, G. Alimonti, M. Boschini, D. Brambilla, B. Caccianiga, A. Calandrino, P. D’Angelo, M. DiCorato, P. Dini, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Milazzo, L. Moroni, D. Pedrini, F. Prelz, M. Rovere, A. Sala, S. Sala, T.F. Davenport III, V.Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Torre, L. Viola, P. Vitulo, H. Hernandez, A.M. Lopez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, J. Quinones, C. Rivera, Y. Zhang, N. Copty, M. Purohit, J.R. Wilson, K. Cho, T. Handler, D. Engh, W.E. Johns, M. Hosack, M.S. Nehring, M. Sales, P.D. Sheldon, K. Stenson, M.S. Webster, M. Sheaff, Y. Kwon | Abstract We report the preliminary measurement by the FOCUS Collaboration (E831 at Fermilab) of masses and widths of the L=1 charm mesons: a D*^0_2 state of mass (width) 2463 .5 ±1 .5 ±1 .5(30 .5 ±1 .9 ±3 .8) MeV/c^2 decaying to D^+pi^-, and a D*^+_2 state of mass (width) 2468.2 ±1 .5 ±1 .4(28 .6 ±1 .3 ±3 .8)M V /c 2 decaying to D^0pi^+. The fit of the invariant mass distribution requires an additional term to account for a broad structure over background. |
| 3616 | 2000-12-19 | Preliminary Results on Charmed Meson Spectroscopy | 2000 | LNF-00-038(P).pdf | S. Sarwar (on behalf of the FOCUS Collaboration) Coauthors are: J.M. Link, V.S. Paolone, M. Reyes, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, J.M. de Miranda, I.M. Pepe, A.C. dos Reis, F. Simão, S. Carrillo, E. Casimiro, H. Mendez, A.Sánchez-Hernández, C. Uribe, F. Vasquez, L. Cinquini, J.P. Cumalat, J.E. Ramirez, B. O’Reilly, E.W. Vaandering (CU Boulder); J.N. Butler, H.W.K. Cheung, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, S.A. Gourlay, P.H. Kasper, A.E. Kreymer, R. Kutschke; S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, D.Y. Kim, K.S. Park, A. Rahimi, J. Wiss, R. Gardner, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, S.S. Myung, H. Park, G. Alimonti, M. Boschini, D. Brambilla, B. Caccianiga, A. Calandrino, P. D’Angelo, M. DiCorato, P. Dini, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Milazzo, L. Moroni, D. Pedrini, F. Prelz, M. Rovere, A. Sala, S. Sala, T.F. Davenport III, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Torre, L. Viola, P. Vitulo, H. Hernandez, A.M. Lopez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, J. Quinones, C. Rivera, Y. Zhang, N. Copty, M. Purohit, J.R. Wilson, K. Cho, T. Handler, D. Engh, W.E. Johns, M. Hosack, M.S. Nehring, M. Sales, P.D. Sheldon, K. Stenson, M.S. Webster, M. Sheaff , Y. Kwon | We report the preliminary measurement by the FOCUS Collaboration (E831 at Fermilab) of masses and widths of the L=1 charm mesons D*^+_2 and D*^+_2 . The fit of the invariant mass distribution requires an additional term to account for a broad structure over background. |
| 3617 | 2000-12-19 | New Focus Results on Charm Mixing and CP Violation | 2000 | LNF-00-039(P).pdf | S. Bianco (for FOCUS Collaboration) Coauthors are: J.M. Link, V.S. Paolone, M. Reyes, P.M. Yager, J.C. Anjos, I. Bediaga, C. Göbel, J. Magnin, J.M. de Miranda, I.M. Pepe, A.C. dos Reis, F. Simão, S. Carrillo, E. Casimiro, H. Mendez, A.Sánchez-Hernández, C. Uribe, F. Vasquez, L. Cinquini, J.P. Cumalat, J.E. Ramirez, B. O'Reilly, E.W. Vaandering, J.N. Butler, H.W.K. Cheung, I. Gaines, P.H. Garbincius, L.A. Garren, E. Gottschalk, S.A. Gourlay, P.H. Kasper, A.E. Kreymer, R. Kutschke, S. Bianco, F.L. Fabbri, S. Sarwar, A. Zallo, C. Cawlfield, D.Y. Kim, K.S. Park, A. Rahimi, J. Wiss, R. Gardner, Y.S. Chung, J.S. Kang, B.R. Ko, J.W. Kwak, K.B. Lee, S.S. Myung, H. Park, G. Alimonti, M. Boschini, D. Brambilla, B. Caccianiga, A. Calandrino, P. D'Angelo, M. DiCorato, P. Dini, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Milazzo, L. Moroni, D. Pedrini, F. Prelz, M. Rovere, A. Sala, S. Sala, T.F. Davenport III, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M. Merlo, D. Pantea, S.P. Ratti, C. Riccardi, P. Torre, L. Viola, P. Vitulo, H. Hernandez, A.M. Lopez, L. Mendez, A. Mirles, E. Montiel, D. Olaya, J. Quinones, C. Rivera, Y. Zhang, N. Copty, M. Purohit, J.R. Wilson, K. Cho, T. Handler, D. Engh, W.E. Johns, M. Hosack, M.S. Nehring, M. Sales, P.D. Sheldon, K. Stenson, M.S. Webster, M. Sheaff, Y. Kwon | We present a summary of recent results on CP violation and mixing in the charm quark sector based on a high-statistics sample collected by photoproduction experiment FOCUS (E831 at Fermilab). We have measured the difference in lifetimes for the $D^0$ decays: $D^0 \rightarrow K^-\pi^+$ and $D^0 \rightarrow K^-K^+$. This translates into a measurement of the $y_{CP}$ mixing parameter in the $\d0d0$ system, under the assumptions that $K^-K^+$ is an equal mixture of CP odd and CP even eigenstates, and CP violation is negligible in the neutral charm meson system. We verified the latter assumption by searching for CP violating asymmetry in the Cabibbo suppressed decay modes $D^+ \to K^-K^+\pi^+$, $D^0 \to K^-K^+$ and $D^0 \to \pi^-\pi^+$. We report preliminary results on a measurement of the branching ratio $\Gamma(D^{*+}\rightarrow \pi^+ (K^+\pi^-))/\Gamma(D^{*+}\rightarrow \pi^+ (K^-\pi^+))$. } |
| 3613 | 2000-12-18 | Low Emittance Photo-Injectors | 2000 | LNF-00-035(P).pdf | M. Ferrario | Photon colliders require high charge polarized electron beams with very low normalized emittances, possibly lower than the actual damping rings design goals ( *e_nx · e_ny |10^-7 m). Recent analytical and numerical efforts in understanding beam dynamics in rf photoinjectors have raised again the question whether the performances of an RF electron gun based injector could be competitive with respect to a damping ring. As a matter of discussion we report in this paper the most recent results concerning low emittance photoinjector designs: the production of polarized electron beams by DC and/or RF guns is illustrated together with space charge compensation techniques and thermal emittance effects. New ideas concerning multi-gun injection system and generation of flat beams by RF gun are also discussed. |
| 3614 | 2000-12-18 | Velocity Bunching in Photo-Injectors | 2000 | LNF-00-036(P).pdf | L. Serafini, M. Ferrario | We describe here a new method to increase the peak current of high brightness electron beams as those required to drive X-ray SASE FEL’s, that is based on a rectilinear compressor scheme utilizing the bunching properties of slow waves. It is shown that whenever a beam, slower than the synchronous velocity, is injected into a RF wave at the zero acceleration phase and slips back in phase up to the peak acceleration phase, it can be compressed as far as the extraction happens at the synchronous velocity. In fact, the bunch undergoes a quarter of synchrotron oscillation that induces a net compression (i.e. a bunch length reduction) up to a factor of 20 when proper care is taken to preserve the longitudinal emittance. A few examples are presented to demonstrate the potentialities of this method, by which multi-kA beams at very low emittance can be generated at moderate energies (about 100 MeV). |
| 3612 | 2000-12-11 | Thickness determination of thin polycrystalline film by grazing incidence X-ray diffraction | 2000 | LNF-00-034(P).pdf | J. Lhotka, R. Kuzel, G. Cappuccio and V. Valvoda | Three methods of thickness measurement based on absorption of X-rays in thin films were tested on polycrystalline titanium nitride film deposited on tungsten carbide substrate. The intensities of three reflections from each material were measured in the incidence range from 3° to 35° of the primary beam. After experimental correction for texture effects, data from the TiN film, the WC substrate or from their ratio were fitted by known functions using least squares routines. The substrate reflection intensities were found to be the most suitable for determining the thickness of the overlaying thin film. The average thickness of TiN film (2.00 ± 0.16 microns) determined from the substrate reflections was in fair agreement with the average value obtained from optical microscopy (2.2 ± 0.8 microns). The use of substrate reflections is generally preferable unless their intensities are spoiled by statistical errors (e.g., low intensity, grain size effect, texture etc.). The method based on the ratio thin-film/substrate reflection intensities is not complicated by correlation of the least square parameters but suffers strongly from accumulated experimental errors. |
| 4645 | 2000-12-11 | Note per l'Installazione di "HP OmniBack II" | 2000 | INFN-TC-00-22.pdf | G. Barbagallo, M. Carboni, D. Cobai, R. Ferrari, F. Ferrera, M. Gambetti, F. Prelz, I. Saccarola, C. Strizzolo, L. Strizzolo | |
| 4644 | 2000-12-06 | PcNets2000 A Workshop aimed at discussing applicativem software, hardware aspects of cluster computing. | 2000 | INFN-TC-00-21.pdf | Ed. by A. Donati, G. di Carlo, M.P. Lombardo, P. Rossi | |
| 3610 | 2000-12-04 | Chiral loop and L$\sigma$M predictions for $\phi\rightarrow\pi^0\eta\gamma$ | 2000 | LNF-00-032(P).pdf | R. Escribano | A prediction for the contributions of chiral loops and the L$\sigma$M model to the radiative \phi\rightarrow\pi^0\eta\gamma$ decay mode is presented. The L$\sigma$M is used as an appropriate framework for describing the pole effects of the $a_0(980)$ scalar resonance. As a result, a better agreement with present available data is achieved for the higher part of the $\pi^0\eta$ invariant mass spectrum. For the branching ratio, a value of $B(\phi\rightarrow\pi^0\eta\gamma)=(0.75$--$0.95)\times 10^{-4}$ is found. |
| 4643 | 2000-11-28 | Status of Particle Astrophysics | 2000 | INFN-AE-00-14.pdf | A. Bettini. B. Barish, E. Fernadez, T. Gaisser, I. Grenier, W. Haxton, E. Lorentz, K. Mannheim, V. Matveev, A. McDonald, J. Peoples, M. Spiro, Y. Totsuka, A. Wilson | |
| 4642 | 2000-11-22 | Object Oriented Design and Implementation of an Intra-Nuclear Transport Model | 2000 | INFN-AE-00-13.pdf | L.Bellagamba, A.Brunengo, E.Di Salvo, M.G.Pia | |
| 3609 | 2000-11-17 | Radiative $VP\gamma$ transitions and $\eta$-$\eta\prime$ mixing | 2000 | LNF-00-031(P).pdf | A. Bramon, R. Escribano, M.D. Scadron | A value for the $\eta$-$\eta\prime$ mixing angle is extracted from the data on $VP\gamma$ transitions using simple quark-model ideas. The set of data covers {\it all} possible radiative transitions between the pseudoscalar and vector meson nonets. Two main ingredients of the model are the use of the quark-flavour basis to describe the $\eta$-$\eta\prime$ system and the introduction of flavour-dependent overlaps for the various $q\bar{q}$ wave functions. The mixing angle is found to be $\phi_P=(37.7\pm 2.4)^\circ$. |
| 4640 | 2000-11-16 | An Underwater Detector and Software Filter for Background | 2000 | INFN-AE-00-12.pdf | R.C. Barná, A. Butkevich, V.D’Amico, D.De Pasquale, A. Italiano, A. Trifiró, M. Trimarchi | A Common problem of the neutrino detections is the cut of the background. To this aim, a simple method has been successfully employed to a Monte Carlo simulation of a large-scale neutrino detector, hopefully giving useful suggestions to the problem of the $km^{3}$ detector. |
| 4641 | 2000-11-16 | Evidence for Pair Correlation Effects in Heavy-Ion Reactions | 2000 | INFN-BE-00-04.pdf | L. Auditore, R.C. Barná, V.D’Amico, D.De Pasquale, A. Italiano, A. Trifiró, M. Trimarchi | The study of (35 MeV) $^{14}N+^{12}C$ elastic transfer reaction has been performed. The experimental data have been fitted by taking into account $np$ pair correlations by means of EFR-DWBA (Exact-Finite-Range Distorted Wave Born Approximation) analysis. The angular distribution, fairly reproduced, confirms the validity of the generalized BCS (Bardeen-Cooper-Schrieffer) theory to explain this behaviour. As a consequence, evidence for possible nuclear Josephson effect has been found. |
| 3608 | 2000-11-14 | Performances of the FINUDA Drift Chambers in a Cosmic Ray Test | 2000 | LNF-00-030(IR).pdf | M. Agnello, M. Bertani, E. Botta, D. Calvo, P. Cerello, F. De Mori, G. D'Erasmo, A. Feliciello, A. Filippi, V. Filippini, P. Gianotti, G. Gomez, S. Marcello, O. Morra, A. Panzarasa, G. Tagliente, L. Venturelli | We report on a cosmic ray test of the FINUDA drift chambers performed inside the \fin\ detector without a magnetic field. From an accurate study of the drift cell space-time relations we determine both the spatial resolution and the mechanical alignment of the chambers. The chambers operate with a non-saturated 70\% He - 30\% iC_4H_10 as mixture and the drift cells are modeled using GARFIELD. After alignment of the drift chamber system, we find a spatial resolution averaged over the entire drift cell and over all angles of incidence of about 140 $\mu$m. |
| 3607 | 2000-11-07 | X-ray Scattering in capillary waveguides | 2000 | LNF-00-029(P).pdf | S.B. Dabagov, A. Marcelli | In the past unexpected coherent phenomena associated with propagation of soft x-ray synchrotron radiation through capillary optical elements (polycapillary lenses and systems of capillaries) have been observed and investigated. In this letter theoretical analysis on x-ray scattering at grazing angles inside capillaries is presented. |
| 3605 | 2000-11-06 | Total Photonic and Hadronic Cross-sections | 2000 | LNF-00-027(P).pdf | R.M. Godbole, A. Grau, G. Pancheri | We discuss total cross-sections within the context of the QCD calculable mini-jet model, highlightings its successes and failures. In particular we show its description of $\gamma \gamma \rightarrow $ and compare it with OPAL and L3 data. We extrapolate this result to $\gamma\ p$ total cross-sections and propose a phenomenological ans\'atz for virtual photon cross-sections. We point out that the good agreement with data obtained with the Eikonal Minijet Model should not hide the many uncertainties buried in the impact parameter distribution. A model obtained from Soft Gluon Summation is briefly discussed and its application to hadronic cross-sections is shown. |
| 3606 | 2000-11-06 | Measurements of Coherent Diffraction Radiation and its Application for Bunch Length Diagnostics in Particle Accelerators | 2000 | LNF-00-028(P).pdf | M. Castellano, L. Catani, A. Cianchi, G. Orlandi, M. Geitz, V.A.Verzilov | Measurements of coherent diffraction radiation from a slit of a variable width generated by short electron bunches were performed in millimeter and submillimeter range. Experimental data are compared with transition radiation case and theoretical predictions. More realistic description, than the conventional theory does, is necessary to correctly account for the data. No noticeable difference in the bunch length value was observed between the diffraction radiation mode in a wide range of the slit widths and transition radiation one in the bunch length evaluation. |
| 3604 | 2000-10-20 | $K\rightarrow \pi\pi e^+e^-$ Decays and Chiral low-energy Constants | 2000 | LNF-00-026(P).pdf | Hannes Pichl | In this paper the branching ratios of the measured decay $K_L\rightarrow \pi^+\pi^-e^+e^-$ and of the still unmeasured decay $K^+\rightarrow\pi^+\pi^0e^+e^-$ are calculated to next-to-leading order in Chiral Perturbation Theory (CHPT). Recent experimental results are used to determine two possible values of the combination $(N^r_{16}-N_{17})$ of weak low-energy couplings (LEC) from the $\mathcal{O}(p^4)$ chiral Lagrangian. Furthermore, the obtained values are compared to theoretical models of weak counter\-term couplings to distinguish between the two possibilities. Using the favoured value of the combination $(N^r_{16}-N_{17})$ and taking into account additional assump\-tions suggested by these models, one can predict the branching ratio of the se\-cond decay as a function of the numerically unknown combination $(N^r_{14}+2N^r_{15})$ of weak low-energy couplings. Finally, making use of a particular model for the individual LECs, one predicts the decay width of the $K^+$ decay in question. |
| 4639 | 2000-10-19 | Recent Results on B Physics from LEP | 2000 | INFN-AE-00-11.pdf | Carlo Caso | In this note I will present some of the most recent results on B properties based on the full LEP1 statistics (approx 4-4.5 M hadronic Z decays each LEP experiment). The selection of the topics follows in a way my personal experience and taste. Acknowledgments are due to LEP Collaborations for providing the data and to the various LEP Heavy Flavour Working Groups for combining the experimental results in the appropriate manner. |
| 3603 | 2000-10-16 | Algorithms for Search of Correlation Between GRBs and Gravitational Wave Burts | 2000 | LNF-00-025(P).pdf | G. Modestino, G. Pizzella | The problem to search for possible correlation between the Gamma Ray Bursts of still unknown origin and data recorded with the Gravitational Wave detectors is studied. A new algorithm for this search based on the Kolmogoroff comparison of distributions is given, which is not affected by the presence of non-gaussian noise. |
| 4638 | 2000-10-03 | On the Investigation of Possible Systematics in WIMP Annual Modulation Search | 2000 | INFN-AE-00-10.pdf | DAMA Collaoration | |
| 4637 | 2000-09-29 | Cavity Longitudinal Loss Factor Measurements by Means of a Beam Test Facility | 2000 | INFN-TC-00-20.pdf | A. Palmieri, L. Tecchio, G. V. Lamanna, V. Variale, A.V. Aleksandrov, P.V. Logatchov, V.G. Vaccaro, M.R. Masullo | A new method for the measurement of Loss Factor for a RF cavity is presented. The method consists of measuring the above quantity by means of the detection both of the RF voltage induced by an electron bunch in the device under test and the bunch charge. The device to be ivestigated is a copper reentrant T-shaped cavity. The experimental results and their comparison with analytical and numerical results are presented. |
| 4634 | 2000-09-27 | GEANT4 Electromagnetic Physics | 2000 | INFN-AE-00-07.pdf | S. Chauvie, V. Grichine, P. Gumplinger, V. Ivanchenko, R. Kokoulin , S. Magni, M. Maire, P. Nieminen, M.G. Pia, A. Rybin, L. Urban | An overview of the main features of Geant4 electromagnetic physics is presented. The role played by advanced software engineering methodologies and by Object Oriented technology is illustrated. The main physics functionalities are described. |
| 4635 | 2000-09-27 | Medical Applications of the GEANT4 Toolkit | 2000 | INFN-AE-00-08.pdf | S. Agostinelli, S. Chauvie, F. Foppiano, S. Garelli, F. Marchetto, P. Nieminen, M.G. Pia, V. Rolando, Ada Solano | A powerful and suitable tool for attacking the problem of the production and transport of different beams in biological matter is offered by the Geant4 Simulation Toolkit. Various activities in progress in the domain of medical applications are presented: studies on calibration of brachytherapy sources and thermoluminescent dosimeters, studies of a complete 3-D inline dosimeter, development of general tools for CT interface for treat ment planning, studies involving neutron transport, etc. A novel approach, based on the Geant4 Toolkit, for the study of radiation damage at the cellular and DNA level, is also presented. |
| 4636 | 2000-09-27 | Space Applications of the GEANT4 Simulation Toolkit | 2000 | INFN-AE-00-09.pdf | E. Daly, H. Evans, F. Lei, F. Longo, S. Magni, R. Nartallo, P. Nieminen, M.G. Pia, P.R. Truscott | The space radiation environment is highly variable and dynamic. With the increasing number and complexity of space missions, the detailed analysis of the effects of that environment often requires the use of advanced Monte Carlo radiation transport tools. In this presentation, various space-oriented developments and applications based on the Geant4 particle transport toolkit are described. |
| 4633 | 2000-09-25 | High Quantum Efficiency Photocathode Preparation System for TTF Injector II | 2000 | INFN-TC-00-19.pdf | P. Michelato, C. Gesmundo, D. Sertore | The TESLA Test Facility (TTF) Injector II photocathode preparation system is in opera-tion since spring 1998. High quantum efficiency tellurium and alkali metals based pho-toemissive films are routinely produced at Milano with typical 10% quantum efficiency (QE). Photocathodes are then successfully transported with no QE degradation, using a handy ultra high vacuum (UHV) system, to DESY and here transferred to the RF gun. The main characteristics of the system and the future developments are here discussed. |
| 3602 | 2000-09-21 | Hadronic Cross-Sections in $\gamma \gamma$ Processes and the Next Linear Collider | 2000 | LNF-00-024(P).pdf | Rohini M. Godbole, G. Pancheri | In this note we address the issue of theoretical estimates of the hadronic cross-sections for $\gamma \gamma$ processes. We compare the predictions of the minijet model with data and with other models, highlighting the band of uncertainties in the theoretical predictions as well as those in the final values of the $\sigma (\gamma \gamma \rightarrow hadrons)$ extracted from the data. We find that the rise of $\sigma^{tot}_{\gamma \gamma}$ with energy shown in the latest $\gamma \gamma$ data is in tune with the faster rise expected in the Eikonal Minijet Models (EMM). We present an estimate of the accuracy with which this cross-section needs to be measured to distinguish between the different theoretical models which try to 'explain' the rise of total cross-sections with energy. We find that the precision of measurement required to distinguish the EMM type models from the proton-like models $\stackrel{<}{\sim}$ 20\%, whereas to distinguish between various proton-like models or between different parametrizations of the EMM, a precision $\stackrel{<}{\sim}$ 8-9\% or $\stackrel{<}{\sim}$ 6-9\% respectively, for 300 ${<}$ $\sqrt{s_{\gamma \gamma}$ ${<}$ 500 GeV. We also comment briefly on the implications for the predictions for the hadronic backgrounds at the next linear collider (NLC) to be run in the $\gamma \gamma$ mode $e^{+} e^{-}$ mode. |
| 3601 | 2000-09-19 | Energetic Cosmic Rays Observed by the Resonant Gravitational Wave Detector NAUTILUS | 2000 | LNF-00-023(P).pdf | P. Astone, M. Bassan, P. Bonifazi, P. Carelli, E. Coccia, S.D'Antonio, V. Fafone, G.Federici, A. Marini, G. Mazzitelli, Y. Minenkov, I. Modena, G. Modestino, A. Moleti, G. V. Pallottino, V. Pampaloni, G. Pizzella, L.Quintieri, F. Ronga, R. Terenzi, M. Visco, L. Votano | Cosmic ray showers interacting with the resonant mass gravitational wave antenna NAUTILUS have been detected. The experimental results show large signals at a rate much greater than expected. The largest signal corresponds to an energy release in NAUTILUS of 87 TeV. We remark that a resonant mass gravitational wave detector used as particle detector has characteristics different from the usual particle detectors, and it could detect new features of cosmic rays. Among several possibilities, one can invoke unexpected behaviour of superconducting Aluminium as particle detector, producing enhanced signals, the excitation of non-elastic modes with large energy release or anomalies in cosmic rays (for instance, the showers might include exotic particles as nuclearites or Q-balls). Suggestions for explaining these observations are solicited. |
| 4632 | 2000-09-15 | Compensating the influence of the Earth’s Magnetic Field on the Scintillator Detector Resolutions by PMTs Orientation | 2000 | INFN-TC-00-18.pdf | A.Ianni. G. Korga, G. Ranucci, O. Smirnov, A. Sotnikov | |
| 3599 | 2000-09-13 | DAFNE Machine Project | 2000 | LNF-00-021(P).pdf | DAFNE Team | No Abstract |
| 3600 | 2000-09-13 | High Hydrogen Loading into Thin Palladium wires Through Precipitate of Alkaline_Earth Carbonate on the Surface of Cathode: Evidence of New Phases in the Pd-H System and Unexpected Problems due to Bacteria Contamination in the Heavy Water | 2000 | LNF-00-022(P).pdf | F.Celani, A. Spallone, P. Marini, V. Di Stefano, M. Nakamura, A. Mancini, S. Pace, P. Tripodi, D. Di Gioacchino, C. Catena, G. D'Agotaro, R. Petraroli, P. Quercia, E. Righi, G. Trenta | A new procedure has been developed at INFN Frascati Laboratory in order to achieve a very high Hydrogen or Deuterium electrolytic loading into a long and thin Palladium wire. This technique consists in the addition of a very small amount of alkaline-earth elements into a very diluted acidic solution. Because of enhancing pH values around the cathode, during the electrolysis, carbonates are able to precipitate onto the cathode's surface forming a thin layer which strongly increases the Pd loading; a computer simulation has been developed to find out the proper working conditions for the carbonates precipitation. Loading results of Hydrogen were excellent (H/Pd= 1). The evidence of a new phase in the Pd-H system was inferred from the basis of the variation of the thermal resistivity coefficient of the Pd wire as a function of the H/Pd ratio. Less satisfactory results were obtained for Deuterium (D/Pd@ 0.85, no excess heat) because of inorganic and organic contamination normally present in ordinary heavy water. A peculiar procedure to purify heavy water, developed at INFN-LNF, has permitted to achieve interesting loading, up to D[Pd=- 0.97, for several days and evidence of overheating of Pd wire i.e. 'excess heat'. We have discovered that the obtained poor results with the heavy water are mainly due to the presence of two kinds of new bacteria living in the commercial reactor-grade heavy water we have used for the loading tests. We named such bacteria (Ralstonia and Stenotrophomonas genera) 'Detusculanense' specie. |
| 4630 | 2000-09-09 | Setting of the Predefined Multiplier Gain of a Photomultiplier | 2000 | INFN-TC-00-16.pdf | O. Ju. Smirnov | |
| 4631 | 2000-09-09 | Resolutions of a Large Volume Liquig Scintillator Detector | 2000 | INFN-TC-00-17.pdf | O. Ju. Smirnov | |
| 4629 | 2000-09-06 | LDAP as a Network Information Service | 2000 | INFN-TC-00-15.pdf | G. Lo Biondo | This document focuses on how to use LDAP as a NIS substitute for user accounts man-agement. Having a lot of user accounts on several hosts often causes misalignments in the accounts configuration. LDAP can be used to build a centralized authentication system thus avoiding data replication and increasing data consistency. |
| 3598 | 2000-09-04 | 1/N_c and e'/e | 2000 | LNF-00-020(P).pdf | T. Hambye, P.H. Soldan | We present a recent analysis of epsilon'/epsilon in the 1/N_c expansion. We show that the 1/N_c corrections to the matrix element of Q_6 are large and positive, indicating a Delta I = 1/2 enhancement similar to the one of Q_1 and Q_2 which dominate the CP conserving amplitude. This enhances the CP ratio and can bring the standard model prediction close to the measured value for central values of the parameters. Several comments on the theoretical status of epsilon'/epsilon and the errors in its calculation are given. |
| 4628 | 2000-08-28 | Search for the Nucleon and di-nucleon Decay into Invisible Channels | 2000 | INFN-AE-00-06.pdf | R. Bernabei, M. Amato, P. Belli, R. Cerulli, C.J. Dai, V.Yu. Denisov, H.L. He, A. Incicchitti, H.H. Kuang, J.M. Ma, F. Montecchia, O.A. Ponkratenko, D. Prosperi, V.I. Tretyak, Yu.G. Zdesenko | |
| 4627 | 2000-07-25 | Antares Junction Box – Mechanical Executive Design and Manufacturing | 2000 | INFN-TC-00-14.pdf | M. Ameri, M. Anghinolfi, P. Cocconi, S. Cuneo, R. Papaleo, F. Parodi, P. Prati, G. Raia, A. Rottura | This report describes the executive design and specification of the junction box container, complying with the requirements stated in the previous Antares official documents (1), (2), (3). Structural, thermal, corrosion, manufacturing and quality assurance considerations have been made, to produce a design that could both comply with the requirements and ensure a high reliability, trying to find a good cost compromise too. |
| 3597 | 2000-07-24 | Chiral Loops and a_0(980) Exchange in \phi to pi^0 \eta \gamma | 2000 | LNF-00-019(P).pdf | A. Bramon, E. Escribano, J.L. Lucio M, M. Napsuciale , G. Pancheri | The radiative $\phi\rightarrow\pi^0\eta\gamma$ decay is discussed emphasizing the effects of the $a_0$(980) scalar resonance which dominates the high values of the $\pi^0\eta$ invariant mass spectrum. In its lowest part, the proposed amplitude coincides with the reliable and ChPT-inspired contribution coming from chiral loops. The $a_0$(980) resonance is then incorporated exploiting the complementarity between ChPT and the linear sigma model for this channel. The recently reported experimental invariant mass distribution and branching ratio can be satisfactorily accommodated in our framework. For the latter, a value of $B(\phi\rightarrow\pi^0\eta\gamma)$ in the range $(0.75$--$0.95)\times 10^{-4}$ is predicted. |
| 4623 | 2000-07-10 | A Protocol to Perform Repair Joints Inside ATLAS Barrel Toroid Conductors | 2000 | INFN-TC-00-11.pdf | G. Volpini, C. Uva | In case substantial difficulties are met to extrude sufficiently long lengths of the conductor for the ATLAS Barrel Toroid, it could be necessary to join shorter pieces. We have shown elsewhere that these joints, when properly performed, have a resistance sufficiently low to allow their use inside the ATLAS windings. The details of the protocol suggested to perform these joints is herein described. |
| 4624 | 2000-07-10 | Measurement of an Internal Joint and a Layer-to-Layer Joint as a Function of the Magnetic Field | 2000 | INFN-TC-00-12.pdf | G. Volpini, M. Pojer | We have measured the resistance of an internal (repair) joint, 510 mm long, as a function of an applied magnetic field from 0 to 4 T. In the same experimental set-up we have also measured: i) the matrix aluminium RRR; ii) the contact resistance between the Rutherford cable and the matrix and iii) the resistance of a layer-to-layer joint, 105 mm long. |
| 4626 | 2000-07-10 | Clock Generator for BOREXino Experiment | 2000 | INFN-TC-00-13.pdf | A. Bevilaqua, F. Pratolongo | In questo documento vi è la descrizione del progetto della scheda di clock per l’esperimento BOREXino [1]. Sono presentate le misure effettuate sulla scheda, per caratterizzare e per verificare che rispetti i vincoli fissati dall’esperimento. Lo scopo di questa scheda è di generare i clock a 20 Mhz, a 50 Mhz e ad 60 Mhz, oltre che un segnale di clock programmabile, che può essere variato in un range da 30 fino a 70 Mhz. Questi segnali sono necessari a far funzionare correttamente tutte le schede dell’elettronica digitale dell’esperimento BOREXino. |
| 4625 | 2000-07-10 | High Sensitivity $2\beta$ Decay Study of $^116$Cd and $^100$Mo with the BOREXINO Counting Test Facility (CAMEO Project) | 2000 | INFN-BE-00-03.pdf | G. Bellini et al. | |
| 3596 | 2000-06-27 | A Reproducible Method to Achieve Very High (Over 1:1) H/PD Loading Ratio Using Thin Wires in Acidic Solution with Addition of Very Low Concentration Impurities | 2000 | LNF-00-018(P).pdf | A. Spallone, F. Celani, P. Marini, V. di Stefano | A peculiar electrolytic protocol has been determinate to achieve very high Hydrogen loading into a thin Palladium wire (H/Pd= 1): electrolysis (with high/low current cycles) has been performed with a very diluted acidic solution (H2O+HCl) adding a very small quantity of alkaline/earth or heavy metal elements (Sr and/or Hg). A systematic study has been performed with these elements (added to the electrolyte) in order to have a controlled loading dynamics. The aim and the result of this study has been to reproduce H/Pd * 1 loading value, just using very low electrolysis voltage and current (7V, 5mA). Other two independent Research Groups have tested this protocol reproducing similar results. |
| 3595 | 2000-06-15 | Leptogenesis from Neutralino Decay with Nonholomorphic R-parity Violation | 2000 | LNF-00-017(P).pdf | Thomas Hambye, Ernest Ma, Utpal Sarkar | In supersymmetric models with lepton-number violation, hence also R-parity violation, it is easy to have realistic neutrino masses, but then leptogenesis becomes difficult to achieve. After explaining the general problems involved, we study the details of a model which escapes these constraints and generates a lepton asymmetry, which gets converted into the present observed baryon asymmetry of the Universe through the electroweak sphalerons. This model requires the presence of certain nonholomorphic R-parity violating terms. For completeness we also present the most general R-parity violating Lagrangian with soft nonholomorphic terms and study their consequences for the charged-scalar mass matrix. New contributions to neutrino masses in this scenario are discussed. |
| 4622 | 2000-06-08 | Proposal of a Hierarchical Neural System for the Automatic Classification of Multidetector Array Data | 2000 | INFN-BE-00-02.pdf | M. Alderighi, P. Guazzoni, S. Russo, G. R. Sechi, L. Zetta | Biological vision processes are at the basis of many studies in the image-processing field. In this context, pre-attentive neural networks developed by S. Grossberg constitute an interesting approach. They are able to extract meaningful information from the global structure of data rather than from local relationships, yielding to a coherent and complete visual perception (emergent perception), also in case of noisy and incomplete images. The paper presents the application of Grossberg’s approach to the analysis of scatter plots from nuclear physics experiments. The design and implementation of a pre-attentive neural system developed for this purpose are presented. Simulation results prove the goodness of the approach. |
| 3594 | 2000-06-06 | Electromagnetism in Nonleptonic Weak Interactions | 2000 | LNF-00-016(P).pdf | G. Eker G. Isidori, G. Mddot{u}ller, H. Neufeld, A. Pich | We construct a low-energy effective field theory that permits the complete treatment of isospin-breaking effects in nonleptonic weak interactions to next-to leading- order. To this end we enlarge the chiral Lagrangian describing strong $\Delta S=1$ weak interactions by including electromagnetic terms with the photon as additional dynamical degree of freedom. The complete and minimal list of local terms at next-to-leading order is given., We perform the one-loop renormazation at the level of the generating functional and specialize to $K\to\pi\pi$ decays. |
| 4621 | 2000-06-01 | Backup dei Dati Utente nell'INFN: Requisiti e Valutazione della Tecnologia Hardware e Software | 2000 | INFN-TC-00-10.pdf | G. Barbagallo, M. Carboni, D. Cobai, R. Ferrari, F. Ferrera M. Gambetti, F. Prelz, I. Saccarola, C. Strizzolo, L. Strizzolo | In questo documento vengono descritti i requisiti per un sistema di backup comune per i servizi calcolo INFN identificati dal gruppo di lavoro “Tool di interesse generale” su mandato della Commissione Calcolo. Vengono inoltre illustrati i risultati e le conclusioni ottenute nel corso delle attivit' a di valutazione di pacchetti software commerciali e public domain. Sono infine descritti i risultati delle attivit` a di technology tracking di supporti e soluzioni di storage su disco e nastro. |
| 4620 | 2000-06-01 | BA.SE.: Idee per un Backup Semplificato | 2000 | INFN-TC-00-09.pdf | G. Barbagallo, M. Carboni, D. Cobai, R. Ferrari, F. Ferrera M. Gambetti, F. Prelz, I. Saccarola, C. Strizzolo, L. Strizzolo | I prodotti commerciali di backup non forniscono una copertura completa delle esigenze di backup identificate all’interno dei servizi calcolo dell’INFN. L’integrazione di compo-nenti esistenti di pubblico dominio con una struttura di storage estremamente semplifi-cata (e resa possibile dal basso costo delle unit` a a disco in ambiente PC) sembra fornire un’alternativa pratica ed accessibile. Presentiamo le caratteristiche di un simile sistema. |
| 4619 | 2000-05-30 | Servizio di Accesso Dial-Up | 2000 | INFN-TC-00-08.pdf | S. Lusso | Questo documento riporta la procedura utilizzata per la realizzazione di un servizio di accesso dial-up. Il servizio dial-up consente all'utente il collegamento alla rete di istituto tramite linea telefonica. Il servizio è costituito essenzialmente da quattro componenti: una linea telefonica, un modem, un server di accesso ed un server di autenticazione. Le configurazioni possono variare a seconda delle esigenze e della disponibilità hardware. Nel documento si analizza la configurazione di un router Cisco e l’installazione di un server di autenticazione (XTACACS) e la sua configurazione su di un server UNIX. Sono riportate inoltre alcune soluzioni adottate per la gestione degli utenti. |
| 4618 | 2000-05-18 | Stress on Cold Mass Due to the Supporting System of the CMS Coil in the Vacuum Tank | 2000 | INFN-AE-00-5.pdf | S. Farinon, P. Fabbricatore | This report contains a verification analysis of the stress on cold mass coming from the supporting system of the CMS coil in the vacuum tank. The need to carry out this analysis is related to the high mechanical requirements for Al-alloy mandrels (218 MPa yield at cryogenic temperature), demanding accurate analysis of the impact of supporting system on cylinder stress. |
| 4617 | 2000-05-17 | A Model for the Corrent Distribution Inside the Resistive Joints of the ATLAS Toroids | 2000 | INFN-TC-00-07.pdf | G. Volpini | The eddy currents generated inside a cable joint may have remarkable consequences both during measurements on test joints and also during magnet operation. In the latter case the induced currents may be very high, possibly exceeding the critical value. Also the power dissipated by the resistive decay of such currents can be many times larger than the steady state value. These eddy currents -and therefore the dissipation- can be significantly reduced by means of a suitable choice of the joint length. |
| 4616 | 2000-05-02 | The RF Control and Detection System for PACO the Parametric Converter Detector | 2000 | INFN-TC-00-06.pdf | Ph. Bernard, G. Gemme, R. Parodi, E. Picasso | In this technical note the rf control and detection system for a detector of small harmonic displacements based on two coupled microwave cavities (PACO) is presented. The basic idea underlying this detector is the principle of parametric power conversion between two resonant modes of the system, stimulated by the (small) harmonic modulation of one system parameter. In this experiment we change the cavity length applying an harmonic voltage to a piezo-electric crystal. The system can achieve a great sensitivity to small harmonic displacements and can be an interesting candidate for the detection of small, mechanically coupled, interactions (e.g. high frequency gravitational waves). |
| 4615 | 2000-04-21 | Production of Heavy Ion Beams by Operating Serse in DC Mode and Afeterglow Mode | 2000 | INFN-TC-00-05.pdf | S. Gammino, G. Ciavola, L. Celona, A. Girard, D. Hitz, G. Melin | The superconducting ECR ion source SERSE is going to be coupled to a 28 GHz generator, in order to achieve higher current of intermediate and high charge states of heavy ions. Some preliminary tests have been carried out to demonstrate the capability to produce currents of heavy ion beams in the order of hundreds emA in dc mode and afterglow mode. In particular, the latter tests in afterglow mode ùay play a relevant role in the design of the new source for the LHC heavy ion injector. |
| 4614 | 2000-04-14 | Influence of the Leakage Current on the Performance of Large Area Silicon Drift Detectors | 2000 | INFN-TC-00-04.pdf | C. Piemonte, A. Rashevsky, D. Novais | In this paper we investigate the influence of the leakage current on the performance of Silicon Drift Detectors. First, analytical considerations are given in order to highlight the problems, specific for this type of detector, that emerge with leakage current. Then the obtained results are compared with the data of laboratory measurements. Aiming at a mass production of SDDs for the Inner Tracking System of the ALICE experiment at LHC we propose a simple and fast measurement for a preliminary selection before passing to a detailed acceptance test. |
| 3593 | 2000-03-30 | Radiative Corrections to the Hadronic Cross--Section Measurement at DA$\Phi$NE | 2000 | LNF-00-015(P).pdf | V.A. Khoze, M.I. Konchatnij, N.P. Merenkov, G. Pancheri , L. Trentadue, O.N. Shekhovzova | The hadronic invariant mass distribution for the process of electron--positron annihilation into a pair of charged pions accompanied by a photon radiated from the initial state has been studied for the region of DA$\Phi$NE energies. The Born cross--section and the electromagnetic radiative corrections to it are calculated for realistic conditions of the KLOE detector. The dependence on the physical parameters which define the event selection is obtained. |
| 3592 | 2000-03-28 | Superworldvolume Dynamics of Superbranes from Nonlinear Realizations | 2000 | LNF-00-014(P).pdf | S. Bellucci , E. Ivanov, S. Krivonos | Based on the concept of the partial breaking of global supersymmetry (PBGS), we derive the worldvolume superfield equations of motion for N=1, D=4 supermembrane, as well as for the space-time filling D2– and D3–branes, from nonlinear realizations of the corresponding supersymmetries. We argue that it is of no need to take care of the relevant automorphism groups when being interested in the dynamical equations. This essentially facilitates computations. As a by-product, we obtain a new polynomial representation for the d=3,4 Born-Infeld equations, with merely a cubic nonlinearity. |
| 3591 | 2000-03-27 | The ratio $Phi& rightarrow K^+K^-/K^0$ bar K^0$ | 2000 | LNF-00-013(P).pdf | A. Bramon, R.Escribano, J.L.Lucio M., G.Pancheri | The ratio $\Phi\rightarrow K^+K^-/K^0\bar K^0$ is discussed and its present experimental value is compared with theoretical expectations. A difference larger than two standard deviations is observed. We critically examine a number of mechanisms that could account for this discrepancy, which remains unexplained. Measurements at DA$\Phi$NE at the level of the per mille accuracy can be presently expected to clarify whether there exist any anomaly. |
| 3588 | 2000-03-24 | Analisi Termostrutturale del Sistema Clessidra-Straws dell'Eesperimento FINUDA | 2000 | LNF-00-010(IR).pdf | S. Tomassini | È stato studiato il comportamento termostrutturale del sistema Clessidra-StrawTubes dell’esperimento FINUDA. In particolare è stata studiata l’influenza della temperatura sulla sagitta e sulla freccia dei fili di tungsteno e degli straws in relazione alla deformazione termica della clessidra su cui sono vincolati. |
| 3589 | 2000-03-24 | Calibrazione del Robot per l'Installazione del Vertice di FINUDA | 2000 | LNF-00-011(IR).pdf | B. Dulach, S. Tomassini | È stata ottimizzata la meccanica del robot utilizzato nell’esperimento FINUDA per l’installazione dei rivelatori di vertice all’interno della Clessidra. |
| 3590 | 2000-03-24 | Adiabatic Plasma Buncher | 2000 | LNF-00-012(P).pdf | M. Ferrario, T.C. Katsouleas, L. Serafini, I. Ben Zvi | In this paper we present a new scheme of injection into a plasma accelerator, aimed at producing a high quality beam while relaxing the demands on the bunch length of the injected beam. The beam dynamics in the injector, consisting of a high voltage pulsed photo-diode, is analyzed and optimized to produce a $lambda_p$ /20 long electron bunch at 2.5 MeV. This bunch is injected into a plasma wave in which it compresses down to $lambda_p$ /100 while simultaneously accelerating up to 250 MeV. This simultaneous bunching and acceleration of a high quality beam requires a proper combination of injection energy and injection phase. Preliminary results from simulations are shown to assess the potentials of the scheme. |
| 4613 | 2000-03-22 | The Stern-Gerlach Interacion Between a Traveling Particle and a Time Varying Magnetic Field | 2000 | INFN-TC-00-03.pdf | M. Conte, M. Ferro, G. Gemme, W.W. Mackay, R. Parodi, M. Pusterla | The general expression of the Stern-Gerlach force is deduced for a charged particle, endowed with a magnetic moment, which travels inside a time varying magnetic field. Then, the energy integral of the Stern-Gerlach force is evaluated in the case of a particle crossing a TE rf cavity with its magnetic moment oriented in different ways with respect as the cavity axis. We shall demonstrate that appropriate choices of the cavity characteristics and of the spin orientation confirm the possibility of separating in energy the opposite spin states of a fermion beam circulating in a storage ring and, in addition, make feasible an absolute polarimeter provide that a parametric converter acting between two coupled cavities is implemented. |
| 4612 | 2000-03-17 | On Line Monitoring of the TTF Cryostats Cold Mass with Wire Position Monitors | 2000 | INFN-TC-00-02.pdf | A. Bosotti, C. Pagani, G. Varisco | A Wire Position Monitor (WPM) system is used to measure on line the TTF cryomodules alignment stability and reproducibility during cooldown and warm up operations. This paper reports on the design and realization of the first set of 36 WPMs installed on the first TTF cryomodule, together with the explanation of the electronic read out systems and the analysis of the data acquired during the first three complete thermal cycles of the Linac. A paragraph on the improved WPMs for the other TTF cryomodules can be found at the end of the paper. |
| 3587 | 2000-03-15 | N=(4,4), 2D Supergravity in SU(2) x SU(2) Harmonic Superspace | 2000 | LNF-00-009(P).pdf | S. Bellucci, E. Ivanov | We work out the basics of conformal N=(4,4), 2D supergravity in the N=(4,4), 2D analytic harmonic superspace with two independent sets of harmonic variables. We define the relevant most general analytic superspace diffeomorphism group and show that in the flat limit it goes over into the 'large'' N=(4,4), 2D superconformal group. The basic objects of the supergravity considered are analytic vielbeins covariantizing two analyticity-preserving harmonic derivatives. For self-consistency they should be constrained in a certain way. We solve the constraints and show that the remaining irreducible field content in a WZ gauge amounts to a new short N=(4,4) Weyl supermultiplet. As in the previously known cases, it involves no auxiliary fields and the number of remaining components in it coincides with the number of residual gauge invariances. We discuss various truncations of this 'master'' conformal supergravity group and its compensations via couplings to N=(4,4) superconformal matter multiplets. Besides recovering the standard minimal off-shell N=(4,4) conformal and Poincaré supergravity multiplets, we find, at the linearized level, several new off-shell gauge representations. |
| 3586 | 2000-03-13 | Consistent Batalin--Fradkin quantization of Reducible First Class Constraints | 2000 | LNF-00-008(P).pdf | S. Bellucci, A. Galajinsly | We reconsider the problem of BRST quantization of a mechanics with infinitely reducible first class constraints. Following an earlier recipe [Phys. Lett. B{\bf 381} 105 (1996)], the original phase space is extended by purely auxiliary variables, the constraint set in the enlarged space being first stage of reducibility. The BRST charge involving only a finite number of ghost variables is explicitly constructed. |
| 3585 | 2000-03-10 | Space Charge Effects in Rectilinear Motion: Emittance Compensation, Pulse Lengthening, and Halo Formation (Working Group #1 Summary) | 2000 | LNF-00-007(P).pdf | C. Chen, M.Ferrario | This report summarizes the presentations and discussions over a wide range of topics in Working Group I at the Second ICFA Advanced Accelerator Workshop on Physics of High-Brightness Beams held at University of California at Los Angeles (UCLA), November 9-12, 1999. Latest developments towards to a better understanding of high-brightness photoinjectors were reported. The design and commissioning of the Los Alamos National Laboratory (LANL) Low-Energy Demonstration Accelerator (LEDA) Radio-Frequency Quadrupole (RFQ) were reported. The problem of beam halo formation was discussed in both beam transport systems and the SLAC 50 MW 11.4 GHz periodic permanent magnet (PPM) focusing klystron amplifier. A new class of corkscrewing elliptic beam equilibria was reported, and applications of such novel beam equilibria in controlling of charge-density and velocity fluctuations, beam halo formation and emittance growth were discussed. Pattern formation in proton rings was also discussed. |
| 4608 | 2000-03-10 | Localized Superluminal Solutions to Maxwell Equations Propagating Along a Normal-Size Waveguide | 2000 | INFN-FM-00-1.pdf | M. Zamboni Rached, E. Recami, F. Fontana | We show that localized (non–evanescent) solutions to Maxwell equations exist, which propagate without distortion along normal waveguides with Superluminal speed |
| 4609 | 2000-03-10 | Tunneling Through Two Successive Barriers and the Hartman (Superluminal) Effects | 2000 | INFN-FM-00-2.pdf | V.S. Olkhovsky, E. Recami, G. Salesi | We study the phenomenon of one–dimensional non–resonant tunneling through two successive potential barriers, separated by an intermediate free region R, by analyzing the relevant solutions to the Schroedinger equation. We find that the total traversal time does not depend not only on the barrier widths (the so–called 'Hartman effect'), but also on the R width: so that the effective velocity in the region R, between the two barriers, can be regarded as infinite. This agrees with the results known from the corresponding waveguide experiments, which simulated the tunnelling experiment herein considered due to the formal identity between the Schroedinger and the Helmholtz equation. |
| 4610 | 2000-03-10 | On the Propagation Speed of Evanescent Modes | 2000 | INFN-FM-00-3.pdf | A. Pablo, L. Barbero, H.E. Hernandez, E. Recami | The group–velocity of evanescent waves (in undersized waveguides, for instance) was theoretically predicted, and has been experimentally verified, to be Superluminal (ug > c). By contrast, it is known that the precursor speed in vacuum cannot be larger than c. In this paper, by computer simulations based on Maxwell equations only, we show the existence of both phenomena. In other words, we verify the actual possibility of Superluminal group velocities, without violating the so–called (naive) Einstein causality. |
| 4611 | 2000-03-10 | Special Relativity and Superluminal Motions: a Discussion of Some Recent Experiments | 2000 | INFN-FM-00-4.pdf | E. Recami, F. Fontana, R. Garavaglia | Some experiments, performed at Berkeley, Cologne, Florence, Vienna, Orsay and Rennes led to the claim that something seems to travel with a group velocity larger than the speed c of light in vacuum. Various other experimental results seem to point in the same direction: For instance, localized wavelet–type solutions of Maxwell equations have been found, both theoretically and experimentally, that travel with Superluminal speed. Even muonic and electronic neutrinos – it has been proposed – might be 'tachyons', since their square mass appears to be negative. With regard to the first–mentioned experiments, it was very recently claimed by Guenter Nimtz that those results with evanescent waves or 'tunneling photons' – implying Superluminal signal and impulse transmission – violate Einstein causality. In this note, on the contrary, we want to stress that all such results do not place relativistic causality in jeopardy, even if they refer to actual tachyonic motions: In fact, Special Relativity can cope even with Superluminal objects and waves. For instance, it is possible (at least in microphysics) to solve also the known causal paradoxes, devised for 'faster than light' motion, even if this is not widely recognized. Here we show, in detail and rigorously, how to solve the oldest causal paradox, originally proposed by Tolman, which is the kernel of many further tachyon paradoxes. The key to the solution is a careful application of tachyon mechanics, as it unambiguously follows from Special Relativity. |
| 3583 | 2000-03-06 | Large N_c, Chiral Approach to M_eta, at Finite Temperature | 2000 | LNF-00-005(P).pdf | R. Escribano, F.S. Ling, M.H.G. Tytgat | We study the temperature dependence of the eta and eta' meson masses within the framework of U(3)_L x U(3)_R chiral perturbation theory, up to next-to-leading order in a simultaneous expansion in momenta,quark masses and number of colours. We find that both masses decrease at low temperatures, but only very slightly. We analyze higher order corrections and argue that large N_c suggests a discontinuous drop of M_eta' at the critical temperature of deconfinement T_c, consistent with a first order transition to a phase with approximate U(1)_A symmetry. |
| 3584 | 2000-03-06 | HIGH HYDROGEN LOADING OF THIN PALLADIUM WIRES THROUGH ALKALINE EARTH CARBONATES PRECIPITATION ON THE CATHODIC SURFACE - EVIDENCE OF A NEW PHASE IN THE PD-H SYSTEM | 2000 | LNF-00-006(P).pdf | F. Celani, A. Spallone, P. Marini, V. di Stefano, M. Nakamura, S. Pace, A. Vecchione, A. Mancini, P. Tripodi, D. di Gioacchino | A new protocol for the electrolytic loading of hydrogen (H) in thin palladium (Pd) wires has been developed. In order to increase the cathodic overvoltage, which is known to be the main parameter capable to enhance the electrolytic H loading of Pd, the catalytic action of the Pd surface versus H-H recombination has been strongly reduced by precipitation of a thin layer of alkaline-earth carbonates on the cathode. A set of electrolytes has been employed, containing small amounts of hydrochloric or sulphuric acid and strontium or calcium ions. The H loading has been continuously evaluated through ac measurements of the Pd wire resistance. Uncommonly low resistivity values, leading to an estimate of exceptionally high H loading, have been observed. Evidence of the existence of a new phase in the very high H content region of the Pd-H system has been inferred on the basis of the determination of the temperature coefficient of the electrical resistivity. For this purpose a thin layer of Hg was galvanically deposed on the cathodic surface, in order to prevent any H deloading during the measurements. Our results have been fully reproduced in others 2 well equipped and experienced Laboratories (Italy, USA). |
| 3582 | 2000-03-03 | Homdyn Study for the LCLS RF Photo-Injector | 2000 | LNF-00-004(P).pdf | M. Ferrario, J. E. Clendenin, D. T. Palmer, J. B. Rosenzweig, L. Serafini | We report the results of a recent beam dynamics study, motivated by the need to redesign the LCLS photoinjector, that led to the discovery of a new effective working point for a split RF photoinjector. The HOMDYN code, the main simulation tool adopted in this work, is described together with its recent improvements. The new working point and its LCLS application is discussed. Validation tests of the HOMDYN model and low emittance predictions, 0.3 mm-mrad for a 1 nC flat top bunch, are performed with respect to the multi-particle tracking codes ITACA and PARMELA |
| 3581 | 2000-02-22 | Capillary Optics as an x-ray Condensing Lens: An Alignment Procedure | 2000 | LNF-00-003(P).pdf | Giorgio Cappuccio, Sultan B. Dabagov | The procedure of capillary lens alignment is described in detail. The theoretical basis of capillary optics is given in the framework of a comparative analysis of monocapillary and polycapillary optics. The results of x-ray distribution scanning behind the capillary lens for various angle planes, together with the tting results, are presented. A qualitative explanation is given for the discrepancy between the expected and observed divergences of x-ray beams transmitted by the capillary lens. |
| 4605 | 2000-02-18 | Hidden Source of High Energy Neutrinos in Collapsing Galactic Nucleus | 2000 | INFN-TH-00-03.pdf | V.S. Berezinsky, V.I. Dokuchaev | We propose a model of a short-lived extremely powerful source of high energy neutrinos. It is formed as a result of dynamical evolution of a galactic nucleus prior to its collapse into the massive black hole. A dense central stellar cluster in the galactic nucleus on the large stage of evolution consists of compact stars (neutron stars and stellar mass black holes). This cluster is sinked deep into the massive gas envelope produced in the collisions of the primary stellar population. The frequent collisions of remaining neutron stars in central stellar cluster result in a creation of ultrarelativistic fireballs and shock waves. They produce the rarefied cavern with external shell and quasi-stationary external shock. The particles are effectively accelerated in the cavern and, due to pp-collisions in the gas envelope, they produce high energy neutrinos. All high energy particles, except neutrinos, are absorbed in the thick envelope. Duration of active stage is $\sim10 yr$, the number of the sources can be $\sim~10$ per cosmological horizon. High energy neutrino signal can be detected by underground neutrino telescope with effective area $S \sim 1 km ^{2}$. |
| 4602 | 2000-02-17 | Study of UHE Cosmic Neutrinos Through Horizontal Extensive Air Showers | 2000 | INFN-AE-00-02.pdf | EAS-TOP Collaboration | |
| 4603 | 2000-02-17 | Search for Eg 5•1013 eV g-Ray Transiens Through the BAKSAN and EAS-TOP Correlated Data | 2000 | INFN-AE-00-03.pdf | BAKSAN and EAS-TOP Collaborations | A search for transient point sources of ultra-high-energy (UHE) \gamma-rays has been performed, based on the correlation of two extensive air shower arrays, BAKSAN (North Caucasus, $1700 m$ a.s.l., BAKSAN Neutrino Observatory, Russia) and EAS-TOP (Campo Imperatore, $2005$ a.s.l., Laboratori Nazionali del Gran Sasso, Italy), which are located at very similar latitudes $(\phi\approx 43\dag N)$, and separated in longitude by $\Delta\lambda \approx 33.7\dag$. The search has been conducted at primary energy $E_{\gamma} \geq 5\cdot10^{13} eV$ on the timescale of a daily source transit over the sky observable in the northern hemisphere $(19\dag <\varsigma<69\deg)$, and for three sources, namely the Crab Nebula, Markarian $421$ and Markarian $501$, observed at TeV energies by atmospheric Cherenkov detectors. The stability of the single detectors has been studied and verified up to high significance level. No coincident excess not compatible with the expectations from statistical fluctuations has been observed. The obtained upper limits to the rate of transient events, $n_{\gamma}$, at $90%$ c.l., are: -concerning the sky survey, in the declination band corresponding to the zenith, $n_{gamma}\fraction (\Omega\cdot t) < 12\fraction (yr \cdot sr)$ with $\Phi_{gamma}(E_{gamma} > 5 \cdot 10^{13} eV)> 2.0 \cdot10^{-11} cm^{-2} s^{-1}$ and duration $\Delta t< 8 hrs$; -concerning the candidate sources, e.g., for Markarian $421: n_{gamma}\fraction t < 7.7\fraction yr$ with $\Phi_{gamma}(E_{gamma} > 5. \cdot 10^{13} eV) > 1.3 \cdot10^{-11} cm^{-2} s^{-}1$ and $\Delta t< 7.5 hrs$. A coincident episode from Markarian $421$, observed on January 15th, 1994, with expected chance imitation rate $n_{ch}=0.01$ is discussed. |
| 4604 | 2000-02-17 | Detailed Field Distribution in CMS Winding | 2000 | INFN-AE-00-04.pdf | S. Farinon, P. Fabbricatore | The CMS winding has now arrived at its constructive phase. This means that some practical aspects regarding the winding itself have to be considered, such as the minimum requirement of conductor performance for each layer of each module. Several magnetic calculations have been already performed, but the winding has been never analyzed in detail, in order to understand the impact of the self-field on its performances. This analysis and its implications are reported in this paper. |
| 4601 | 2000-02-11 | Axial Injection in the Superconducting Cyclotron | 2000 | INFN-TC-00-01.pdf | D. Rifuggiato, L. Calabretta | The Superconducting Cyclotron has started working in the axial injection mode. Until September 1999 it worked as a booster of the Tandem, and the beam was radially injected in the median plane. Now the beam is produced by an ECR source and injected along the axis. Therefore, the Cyclotron has been provided with an inflector and a central region. The design calculations are here presented. The pieces of the axial equipment are shown as manufactured by the company. The inflector and the central region were assembled in December 1999. In January 2000, the first beam in the new mode has been injected, accelerated and extracted. |
| 4600 | 2000-02-01 | Search for Wimps Annual Modulation Signature: Results from DAMA/NaI-3 and DAMA/NaI-4 and the Global Combined Analysis | 2000 | INFN-AE-00-01.pdf | R.Bernabei, P. Belli, R. Cerulli, F. Montecchia, M. Amato, G. Ignesti, A. Incicchitti, D. Prosperi, C.J. Dai, H.L. He, H.H. Kunag, J.M. Ma | The data, collected by the $\simeq 100 kg NaI(Tl) DAMA set-up at the Gran Sasso National Laboratory of I.N.F.N. during two further yearly cycles (DAMA/NaI-3 and DAMA/NaI-4; statistics of 38475 kg · day), have been analysed n terms of WIMP annual modulation on signature. The results agree with those previously achieved. The cumulative analysis of all the avaiable data (DAMA/NaI- to 4; statistics of 5798 kg · day) favours the poss ble presence of a WIMP with $M_{w) = (52^+10_{8)$ GeV and $\zeta\sigma_{p}= 7.2^{+0}_{-0.9) \cdot 6 pb at 4\sigma C.L.$, when standard astrophys cal assumptions are considered. The allowed mass extends up to $105 GeV (1\sigma)$ when the uncertainty on the mean value of the local velocity $v_{0}$ is taken into account and up to 32 GeV $(1\sigma})$ in case a possible bulk halo rotat on is also considered. Moreover, the allowed regions extend to lower $\zeta\sigma_{p}$ values when the limit achieved in DAMA/NaI-0 is included in the cumulative analysis (favouring e.g., in case of standard assumptions, $M_{w}=(44 ^{+12}_{- 9}) GeV$ and $\zeta\sigma_{p}=(5.4 \pm 1.0) \cdot 10^{-6} pb at \simeq 4 \sigma C.L.)$. The regions in the $\zeta\sigma_{p}$ versus $M_{w} plane allowed for the possible signal at $3\sigma$ C.L. are given. |
| 4607 | 2000-01-24 | Supercondunctiong Cosmic String as Gamma Ray Burst Engines | 2000 | INFN-TH-00-02.pdf | V. Berezinsky, B. Hnatyk, A. Vilenkin | Cusps of superconducting strings can serve as GRB engines. A powerful beamed pulse of electromagnetic radiation from a cusp produces a jet of accelerated particles, whose propagation is terminated by the shock responsible for GRB. A single free parameter, the string scale of symmetry breaking $\eta \sim 1 \cdot 10^{14}$ GeV , successfully explains the typical values of GRB duration, fluence, the rate of bursts, as well as the observed ranges of these quantities. The wiggles on the string can drive the short-time structures of GRB. The model predicts reoccurance of GRBs with a period of $\sim 20$ yrs. The cusp mechanism resolves also some problems of GRBs as sources of Ultra High Energy Cosmic Rays. |
| 4606 | 2000-01-13 | Ultra High Energy Cosmic Rays from Cosmological Relics | 2000 | INFN-TH-00-01.pdf | V. Berezinsky | The current status of origin of Ultra High Energy Cosm c Rays (UHECR) is reviewed,with emphasis given to elementary particle solutions to UHECR problem, namely to Topological Defects and Super-Heavy Dark Matter (SHDM)particles. The relic superheavy particles are very efficiently produced at inflation. Being protected by gauge discrete symmetries,they can be long lived.They are clustering in the Galactic halo, producing thus UHECR without Greisen-Zatsepin-Kuzmin cutoff. Topological Defects can naturally produce particles with energies as observed and much higher, but in most cases fail to produce the observed fluxes. Cosmic necklaces, monopoles connected by strings and vortons are identified as most plausible sources. The latter two of them are also clustering in the halo and their observational predictions are identical to those of SHDM particles. |
| 3579 | 2000-01-11 | Analyzing epsilon'/epsilon in the 1/N_c Expansion | 2000 | LNF-00-001(P).pdf | T. Hambye, G.O. Köhler, E.A. Paschos, P.H. Soldan | We present a recent analysis of epsilon'/epsilon in the 1/N_c expansion. We show that the 1/N_c corrections to the matrix element of Q_6 are large and positive, indicating a Delta I=1/2 enhancement similar to the one of Q_1 and Q_2 which dominate the CP conserving amplitude. This enhances the CP ratio and can bring the standard model prediction close to the measured value for central values of the parameters. |
| 3580 | 2000-01-11 | Leptogenesis from R Parity Non-conservation | 2000 | T. Hambye, E. Ma, U. Sarkar | It is known that realistic neutrino masses for neutrino oscillations may be obtained from R parity nonconserving supersymmetry. It is also known that such interactions would erase any preexisting lepton or baryon asymmetry of the Universe because of the inevitable intervention of the electroweaksphalerons. We now show how a crucial subset of these R parity nonconserving terms may in fact create its own successful leptogenesis. | |
| 4599 | 2000-01-10 | Neutriniless Double Beta Decay with XE-136 in Borexino Counting Test Facility (CTF) | 2000 | INFN-BE-00-01.pdf | B. Caccianiga, M.G. Giammmarchi | This paper discusses the methods and sensitivity for a Double Beta Decay experiment based on the Xe-136 candidate for BOREXINO or the BOREXINO Counting Test Facility. Different background assumptions and experimental configurations are studied, assuming a data taking period of one year. The related experimental problems are discussed and summary tables containing the sensitivity estimates for the various configurations are presented. |
| 37 | 1999-12-22 | LNF Spring School in Nuclear and Subnuclear Physics (Frascati, 12-17 April, 1999) | 1999 | LNF-99-037(IR).pdf | AA.VV | |
| 4598 | 1999-12-22 | Cardiac Imager Project: Mechanical Design | 1999 | INFN-TC-99-26.pdf | A. Pepato | La nota riporta i criteri principali di progetto di una camera proporzionale a multianodi a filo, sviluppata per la scintigrafia del cuore, nell’ambito di un progetto finanziato dalla Comunità Europea. I rivelatori ad alto counting rate risultano di grande interesse nell’ambito della medicina nucleare, perchè garantiscono immagini dinamiche ad alta risoluzione statistica, pur a fronte di una consistente riduzione dell’intensità della dose radiogena minima e del conseguente tempo di esposizione. E’ stata svilupppata quindi una gamma camera ad elevata velocità riempita di una miscela di Xenon gas ultrapuro ed Etano; il sistema è utilizzato ad una pressione di esercizio compresa tra i 5 ed 10 bar abs. La superficie attiva è di $250x250 mm^{2}$. Al fine di garantire condizioni di esercizio stabili per tempi lunghi, senza degradazione dell’efficienza, è stato progettato un sistema di purificazione in continua del gas, integrato a bordo del rivelatore. E’ stato realizzato un prototipo funzionante da ormai sei mesi presso L’Ecole Superieure de Physique et Chimique di Parigi, ed un secondo prototipo è in fase di allestimento presso la INFN Sezione di Padova e sarà utilizzato presso l’Ospedale Niguarda di Milano. Il progetto è stato sviluppato presso la Sezione INFN di Padova in collaborazione con: – BIOSPACE INSTRUMENTS (F); – CAEN SpA (I); – CAEN MICRO ELECTONICS (I); – HAMILTON & HAMILTON (UK); – ESPCI (Ecole Superieure de Physique et Chimique)(F); – DIPARTIMENTO DI FISICA GALILEO GALILEI (I). |
| 4597 | 1999-12-14 | Probing the Structure of Space-Time with Cosmic Rays | 1999 | INFN-AE-99-24.pdf | R. Aloisio, P. Blasi, P.L. Ghia, A.F. Grillo | We discuss on general grounds the possibility of testing specia relativity and the underlying small scale structure of space-time by studying the interactions of Cosmic Rays (CR) with universal diffuse background radiation.The interactions we consider are the ones characterized by well defined energy thresholds whose energy position can be predicted on the basis of special relativity.We argue that the experimental confirmation of the existence of these thresholds can in principle put very stringent limits on the energy (length) scale where special relativity and/or continuity of space-time break down. |
| 36 | 1999-12-13 | The Upgraded Outer em Calorimeter of FOCUS at Fermilab | 1999 | LNF-99-036(P).pdf | S. Bianco, F.L. Fabbri, M. Giardoni, L. Passamonti, V. Russo, S. Sarvar, A. Zallo, S. Carrillo, H. Mendez, G. Gianini, J. Anjos,, I. Bediaga, C. Gobel,, A. Laudo, J. Magnin, J. Miranda, I. Pepe, F. Simao, A. Sanchez, A. Reis | Operational peformance, algorithmics, stability and physics results of the Outer em calorimeter of FOCUS are orvervieved. |
| 35 | 1999-12-03 | Direct CP Violation in K-> 3pi Deays Induced by SUSY Chromomagnetic Penguins | 1999 | LNF-99-035(P).pdf | G. Isidori, G. D'Ambrosio and G. Martinelli | An analysis of the CP violating asymmetry in $K^\pm\to(3\pi)^\pm$ decays in the Standard Model and, by means of the mass insertion approximation, in a wide class of possible supersymmetric extensions, is presented. We find that the natural order of magnitude for this asymmetry is $\cO(10^{-5})$ in both cases. Within supersymmetric models effects as large as $\cO(10^{-4})$ are possible, but only in a restricted range of the relevant parameters. |
| 4596 | 1999-11-12 | Non-Baryonic Dark Matter Searches | 1999 | INFN-AE-99-23.pdf | Y. Ramachers | The emphasize in this review about non-baryonic dark matter will be on experimental approaches to this fast evolving field of astroparticle physics, especially the direct detection method. The current status of experimental techniques will be reviewed and recent highlights as well as well as future plans will be introduced. |
| 33 | 1999-11-10 | Coherent and Incoherent Components of a Synchrotron Radiation Spot Produced by Separate Capillaries | 1999 | LNF-99-033(P).pdf | Sultan B. Dabagov, Augusto Marcelli, Violetta A. Murashova, Nikolai L. Svyatoslavsky, Rustem V. Fedorchuk, Mikhail N. Yakimenko, P.N. Lebedev | In this work the focusing properties of soft X-ray synchrotron radiation by separate capil-laries are discussed. It is shown that a not negligible fraction of the synchrotron radiation beam transmitted by the capillary has a mode representation. Experimental and theoretical data are discussed to explain the superposition pattern of the X-rays in the focal plane due to the interference phenomena of electromagnetic radiation propagating through separate capillaries. |
| 34 | 1999-11-10 | V_DEV divisore di frequenza programmabile in standard VME 6U | 1999 | LNF-99-034(NT).pdf | A.Balla, G.Corradi, R.Lenci, G. Paoluzzi, M.Santoni | Modulo a 32bit programmabile tramite bus VME, divisore di frequenza a 4 canali per segnali sinusoidali e digitali nello standard NIM, utilizzato per le frequenze di acquisizione nell’esperimento NAUTILUS. |
| 32 | 1999-11-08 | First Measurements at the Daphne Fi-Factory with the DEAR Experimental Setup | 1999 | LNF-99-032(P).pdf | M. Augsburger, A.M. Bragadireanu, J.-P. Egger, B.Gartner, C.Guaraldo, M. Iliescu, R.King , B.Lauss, C.Petrascu, J.Zmeskal | The relevant background for the DEAR experiment - low-energy Xrays and ionizing particles - present in the DEAR interaction region of the DAPHNE e^+e^- collider was inves-tigated using the first stage DEAR setup and CCD detectors. An extensive Monte Carlo simulation was performed for the present setup and beam conditions. Good quantitative agreement between measurements and simulation was achieved. This is a confirmation that, with respect to the expected background, which gives an important contribution to the statistical precision of the experiment, the configuration chosen to measure the strong interaction shift and width in kaonic hydrogen and kaonic deuterium can indeed reach the planned level of accuracy. |
| 4595 | 1999-11-03 | Development and Characterization of ITD Multifilamentary NB3SN Superconductors for 10-15 T Field Magnet | 1999 | INFN-TC_99-25.pdf | M. Pojer, L. Rossi | Inside the European project LHC (the Large Hadron Collider which is currently under construction at CERN), the LASA lab of INFN-Milan has recently carried out a feasibility study and a design of a $Nb_{3}Sn low-\beta$ quadrupole as a possible future candidate for the inner triplet in the Interaction Region of LHC. A preliminary research on material has been developed, centered on ITD (Internal Tin Diffusion) $Nb_{3}Sn$ wires characterization. Measurements on transport properties have shown values of critical current densities as high as $1480 A/mm^{2}$ at 12T, 4.2K, corresponding to $1860 A/mm^{2}$ at 12T, 2.2K. Ic degradation due to cabling has also shown values contained below 15% while the degradation in condition of transversal pressure up to 200 MPa has been found to be in the range of 7% (only 1% irreversible). One of the most important features of $Nb_{3}Sn$ is its volume increase during superconducting phase formation; for this reason volume variations have been determined experimentally. However the actual limit of these conductors is the very high value of effective filament size, as drawn out by magnetization measurements. A possible way of limiting the filament size is proposed. A scaling law for our conductors is also proposed, with $J_{c}$ as a function of magnetic field, temperature and strain. Eventually the excellent $J_{c}$ results recently obtained on a new wire are presented ($J_{c}$ near 2000 $A/mm^{2}$ at 12T and 4.2K). |
| 4592 | 1999-10-28 | Architecture and Performance of a Tag Switching Wide Area Netwotk | 1999 | INFN-TC-99-24.pdf | T. Ferrari, J.M. Uzè, C. Vistoli | Tag switching and MPLS (MultiProtocol Label Switching) combine IP routing exibility with the efficiency of cell switching techniques to address the need of scalable infrastructures, of a wider range of services and of the support of advanced applications. We present the model and the configuration of several tag switching networks in the local and wide area. In particular, we focus on the design of a scalable IP architecture and its application in a wide area testbed based on tag switching, a MPLS implementation by CISCO. The protocol and the network performance have been analysed in terms of functionality, software stability, round trip time, route recovery time and throughput. Results show that tag switching is a promising and viable technique for the implementation of scalable and integrated networks. |
| 31 | 1999-10-26 | A Feasibility Study of an Asymmetric $e^+ e^-$ Linac-Ring Collider at $\sqrts \approx 2\,GeV$ with some Existing Storage Rings | 1999 | LNF-99-031(IR).pdf | P. Patteri | The feasibility studies and luminosity estimates of some conceivable asymmetric $e^+ e^-$ linac-ring colliders are presented. The peculiar features of some storage rings(PETRA, CESR, SPS, PEP II) are discussed in order to achieve a goal luminosity ${\cal L}\approx 10^{30} \div 10^{31} cm^{-2} s^{-1}$ at $\sqrts \approx 2\,GeV$. The performances to be provided by a suitable linac, both a possible, a conventional one, are presented. Some points which are of concern in the design of the detector, due to the boosting of the outgoing particles in the laboratory frame, are introduced too. |
| 29 | 1999-10-25 | Charm Overview | 1999 | LNF-99-029(P).pdf | S. Bianco | This paper is aimed at given a complete review of the latest (post–1998 conference) experimental results on charm physics. |
| 30 | 1999-10-25 | QCD and Total Cross-Sections | 1999 | LNF-99-030(P).pdf | R.M. Godbole, A. Grau, G. Pancheri | We discuss models for total cross-sections, show their predictions for photon-photon col-lisions and compare them with the recent LEP measurements. We show that the extrapo-lations to high center of mass energies within various models differ by large factors at high energies and discuss the precision required fromfuture measurements at the proposed Linear Collider which would allow to distinguish between them. |
| 28 | 1999-10-22 | Heavy Flavor Spectroscopy | 1999 | LNF-99-028(P).pdf | F.L. Fabbri | I review and discuss the status of heavy-flavor spectroscopy. |
| 4593 | 1999-10-22 | GEANT4 Simulation of Energy Losses of ions | 1999 | INFN-AE-99-21.pdf | S. Giani, V.N. Ivanchenko, G. Mancinelli, P. Nieminen, M.G. Pia, L. Urban | The algorithm for the simulation of energy losses of heavy ions is described. The details of its implementation in Geant4 are discussed. The comparison of the simulation results with the experimental data is presented. |
| 4594 | 1999-10-22 | The GEANT4 Object Oriented Simulation Tookit | 1999 | INFN-AE-99-22.pdf | M.G. Pia for GEANT4 Collaboration | Geant4 is a toolkit for the simulation of the passage of particles through matter, developed with advanced software engineering techniques. Its application areas include high energy and nuclear physics experiments, space physics, medical physics and radiation background studies. |
| 4591 | 1999-10-21 | Esperimental Results of Fast X-Ray Imaging with a Silicon Pixel Detector for the Feasibility of an Automatic Tumor X-Ray Survey and Tracking System | 1999 | INFN-TC-99-23.pdf | P.W. Cattaneo, P. Musico, B. Osculati, N. Redaelli, M. Sciutto, S. Squarcia | The results of a test of OMEGA3/LHC1 hybrid silicon pixel detectors as fast X-ray digital imaging apparatus during oncological hadron therapy are reported; the tested detectors show a good sensitivity for low-contrast phantoms. Design modifications for a detector optimization in oncological applications are discussed. |
| 4590 | 1999-10-19 | IPaccounting-Monitoring and Accounting TCP/IP Traffic Through a Cisco Router on a Unix System - Version 3.0 | 1999 | INFN-TC-99-22.pdf | C. Strizzolo | IPaccounting makes you able to monitor and account TCP/IP traffic on a Cisco router, which connects an “accounting domain” to the rest of the “world”. An “accounting domain” is a set of networks whose traffic to the “world” is monitored by IPaccounting. Version 3.0 is the first “compiled” release of IPaccounting, running dramatically faster than previous ones. It includes also some improvements based on the feedback by users of the previous releases. This document includes the installation, the administrator and the user’s guides. |
| 4589 | 1999-10-14 | The Detection of Gravitational Waves by Coupled Microwave Cavities: Theoretical Aspects | 1999 | INFN-TC-99-21.pdf | Ph. Bernard, G. Gemme, R. Parodi, E. Picasso | The basic physical principles underlying the operation of a gravitational waves detector based on two coupled microwave cavities are discussed. The general properties of the interaction of a g.w. and an electromechanical detector are reviewed and the properties of invariance of the four-momentum transfer in different reference frames are considered. Finally the interaction process is analyzed either in the detector proper reference frame or in the rest frame of the detector walls, pointing out the connection of the two descriptions and getting a full picture of the process. |
| 4586 | 1999-10-11 | Studio di Architetture e Protocolli per Reti Ottiche | 1999 | INFN-TC-99-18.pdf | R. Cucchi, A. Ghiselli, C. Raffaelli, C. Vistoli | Le reti ottiche basate sulla tecnologia WDM (Wavelength Division Multiplexing) sono molto promettenti per rispondere non solo alle esigenze di capacità trasmissiva ma anche per la realizzazione di reti costituite da apparati esclusivamente ottici dove la lunghezza d’onda rappresenta il circuito di comunicazione fra nodo sorgente e nodo destinatario. Questo documento prende in esame il “trigger di II livello dell’esperimento ATLAS come case study”, ne analizza le esigenze di trasmissione dei dati e descrive uno studio di fattibilità basato su una rete ottica a stella. |
| 4587 | 1999-10-11 | Progetto QUADIS (Qualità di Servizio) | 1999 | INFN-TC-99-19.pdf | T. Ferrari, A. Ghiselli, C. Vistoli | Le applicazioni distribuite di nuova generazione richiedono servizi di rete garantiti. La rete Internet fornisce tuttora un servizio di tipo “best effort” e perciò non adatto a soddisfare le nuove esigenze che provengono dalle applicazioni. E' necessario studiare nuove architetture che facciano interagire applicazioni e rete in modo più stretto per ottenere più garanzie di affidabilità ed efficienza. Questo documento introduce i concetti base della qualità di servizio sulla rete e i meccanismi in fase di studio o di sperimentazione finora esistenti. Definisce inoltre un programma di lavoro che prevede l'analisi di alcune applicazioni specifiche dell'INFN e la sperimentazione di servizi di rete QoS adatti all'applicazione in esame. Questo documento è allegato al progetto "QUAdiS" di Gruppo V. |
| 4588 | 1999-10-11 | CONDOR on Wan Implementation Proposal | 1999 | INFN-TC-99-20.pdf | A. Ghiselli, P. Mazzanti | This deliverable is part of the project “Condor on WAN” and describes the Condor pool implementation as computing resource for INFN. The Condor pool specifications have been defined taking into account the results of the test phase, terminated by the end of 98. The structure of the operational service is also described |
| 4585 | 1999-10-08 | The Design of a Gas Cerenkov Particle Detector for the Graal High Energy Polarised Photon Facility | 1999 | INFN-TC-99-17.pdf | M. Castoldi, R. Cereseto, A. Fantini, S. Farinon, M. Marchelli, D. Moricciani, G. Nobili, M. Olcese, M. Parodi, R. Puppo, C. Schaerf, A. Zucchiatti | We discuss the design of a multi-mirror gas Cerenkov counter to be added to the existing GRAAL apparatus at the European Synchrotron Radiation Facility in Grenoble. The guidelines of the project are reviewed and their impact on the mechanical design is outlined. Several technical procedures adopted to design the bank of mirrors and their support: computer aided engineering (CAE), optical ray-tracing, materials selection, are discussed in detail. Structural analysis has been done to assess reproducibility of optical performances of the detector. |
| 26 | 1999-09-21 | A Comparative Study of the Decays $B \to (K,K^*) \ell^+ \ell^-$ in Standard Model and Supersymmetric Theories | 1999 | LNF-99-026(P).pdf | A. Ali, P. Ball, L. T. Handoko, G. Hiller | Using improved theoretical calculations of the decay form factors in the Lightcone-QCD sum rule approach, we investigate the decay rates, dilepton invariant mass spectra and the forward-backward (FB) asymmetry in the decays $B \to (K,K^*) \ell^+ \ell^-$ ($\ell^\pm =e^\pm,\mu^\pm,\tau^\pm$) in the standard model (SM) and a number of popular variants of the supersymmetric (SUSY) models.Theoretical precision on the differential decay rates and FB-asymmetry are worked out in these theories taking into account various parameteric uncertainties. We argue that the FB-asymmetry in $B \to K^* \ell^+ \ell^-$ provides a precision test of the SM and its measurement may reveal new physics.In particular, the presently allowed large-$\tan \beta$ solutions in SUGRA models yield FB-asymmetries which are characteristically different from the corresponding ones in SM. We also emphasize the role of exclusive rare decays, in particular, the present experimental bounds on the branching ratio ${\cal B}(B \to K^* \ell^+ \ell^-)$ in constraining the parameters of the SUSY models. |
| 27 | 1999-09-21 | CP Violation | 1999 | LNF-99-027(P).pdf | J. Lee–Franzini | |
| 4583 | 1999-09-21 | Finite Density (Might Well Be Easier) at Finite Temperature | 1999 | INFN-TH-99-04.pdf | M.P. Lombardo | Experiments with imaginary chemical potential and Glasgow method carried out in two interrelated models - four dimensional QCD in the infinite coupling limit, and one dimensional QCD - support the point of view expressed by the title. |
| 4581 | 1999-09-07 | GEANT4 Simulation of Energy Losses of Slow Hadrons | 1999 | INFN-AE-99-20.pdf | S. Giani, V.N. Ivanchenko, G. Mancinelli, P. Nieminen, M.G. Pia, L. Urban | The algorithm of the simulation of energy losses for hadrons with kinetic energy down to few eV is described. The details of its implementation in Geant4 are discussed. The comparison of the reslts of simulation with the experimental data is presented. |
| 4578 | 1999-09-03 | GEANT4 Low Energy Electromagnetic Models for Electrons and Photons | 1999 | INFN-AE-99-18.pdf | J. Apostolakis, S. Giani, M. Maire, P. Nieminen, M.G. Pia, L. Urban | A set of physics processses has been developed in the Geant4 Simulation Toolkit to describe the electromagnetic interactions of photons and electrons with matter down to 250 eV. Preliminary comparisons of the models with experimental data show a satisfactory agreement. |
| 4579 | 1999-09-03 | GRB990705: a Detectable Neutrino Source? | 1999 | INFN-AE-99-19.pdf | LVD Collaboration | The detection of the Gamma Ray Burst GRB990705 on July $ 5^{th}$ 1999, pointing to the Large Magellanic Clouds, suggested the search for the possible existence of a neutrino signal, either in coincidence or preceding the photon burst. We investigated this possibility by the LVD neutrino telescope at the Gran Sasso Underground Laboratories. No evidence of a $\nu$ signal either simultaneous or preceding the GRB has been found, hence we set upper limits on the $\overline\nu_{e}$ flux ·cross-section product. Assuming thermal $overline\nu_{e}$ spectra, the results are expressed in terms of limits on the $overline\nu_{e}$ flux for different spectral temperatures. |
| 4580 | 1999-09-03 | Interquark Potential, Susceptibilities and Particle Density of Two Color QCD at Fine Chemical Potential and Temperature | 1999 | INFN-TH-99-03.pdf | M.P. Lombardo | We explore the phase diagram of SU(2) Lattice Gauge Theory with dynamical fermions in the temperature, mass, chemical potential space. We observe qualitative changes of the dependence of the particle density on \mu and T, which is copatible with that expected of a gas of free massless quarks $n \alpha \mu^{3}$ only for $\simeq T_{c}$. At the onset for thermodynamics the interquark potential flattens at large separations, indicating enhanced fermion screening and the transition to a deconfined phase. Temporal and spatial Polyakov loops behave in different ways, the latter being nearly insensitive to the chemical potential. The rotation of the chiral condensate to a baryonic condensate, as inferred from the susceptibilities, might occur together with a reduction of its magnitude in the chiral limit, possibly leading to a critical temperature for diquark condensation smaller than the deconfinement temperature. We further asses the r \hat{o}le of the chemical potential into the gauge dynamics by carrying out a partial quenched calculation. We speculate on the relevance, or lack thereof, of our findings to real QCD. |
| 4582 | 1999-08-23 | Progress Report Towards the ICANOE Detector | 1999 | INFN-AE-99-17.pdf | ICARUS & NOE Collaboration | We present a proposal for a combined ICARUS & NOE general purpose detector, to be installed in Hall B of the Gran Sasso Laboratory. The main scientific goal is the one of elucidating in a comprehensive way the pattern of neutrino masses and mixings, following both (1) the S-KAM results and (2) the predictions on atmospheric neutrinos of the large solution of the Solar Neutrinos deficit. To achieve these goals, the experimental method is based upon the complementary and simultaneous detection of CERN beam (CNGS) and cosmic ray (CR) events. This is made possible because of the complete isotropy of the detection technique. For the currently allowed values of the S-KAM results, both CNGS and cosmic ray data will give independent measurements and provide a precise $(sin^{2}2\theta; \Delta m^{2})$ determination rather than a wide band of allowed values. Since we can observe and unambiguously identify $\nu_{e},\nu_{\mu}$ and $\nu_{\tau}$ components, the full (3x3) mixing matrix can be explored, reaching an ultimate sensitivity for CR neutrinos as low as $\Delta m^{2} \approx 10^{-5}eV^{2}$, well above the value observed by the Solar neutrino deficit. All separate processes, electron-CC, muon-CC and NC are equally well observed in all detail with imaging and calorimetric methods, without detector biases and down to kinematical threshold. The detector fruitfully merges the superior imaging quality of the ICARUS with the high resolution full calorimetric containment of NOE, suitably upgraded to provide also magnetic analysis of muons. It has a modular structure of independent supermodules and is expandable by the addition of such supermodules, each consisting of a low density 1.6 kton liquid target and of a high density 0.7 kton active solid target. While the basic concepts of the detector appear well established, this present conceptual design does not represent the final optimization of the complete detector. We plan to continue this process in the following months, in view of the response of scientific committees and of the possible interest of new collaborators. Our present timescale foresees the operation of a first supermodule in 2003 for atmospheric neutrino and nucleon decay physics. Additional modules will be added in the following years and a 4 supermodules 9 Kton configuration will be ready for the start of the CERN-NGS beam in 2005. |
| 18 | 1999-08-10 | Connections between epsilon'/epsilon and Rare Kaon Decays in Supersymmetry | 1999 | LNF-99-021(P).pdf | A.J. Buras, G. Colangelo, G. Isidori, A. Romanino, L. Silvestrini | We analyze the rare kaon decays $\klpn$, $\kppn$, $\kpe$ and $\kmm$ in conjunction with the CP violating ratio $\epp$ in a general class of supersymmetric models in which $Z$- and magnetic-penguin contributions can be substantially larger than in the Standard Model. We point out that radiative effects relate the double left-right mass insertion to the single left-left one, and that the phenomenological constraints on the latter reflect into a stringent bound on the supersymmetric contribution to the $Z$ penguin. Using this bound, and those coming from recent data on $\epp$, we find ${\rm BR}(\klpn)\lsim 1.2\cdot 10^{-10}$, ${\rm BR}(\kppn)\lsim 1.7\cdot 10^{-10}$, ${\rm BR}(\kpe)_{\rm dir}\lsim 2.0\cdot 10^{-11}$, assuming the usual determination of the CKM parameters and neglecting the possibility of cancellations among different supersymmetric effects in $\epp$. Larger values are possible, in principle, but rather unlikely. We stress the importance of a measurement of these three branching ratios, together with improved data and improved theory of $\epp$, in order to shed light on the realization of various supersymmetric scenarios. We reemphasize that the most natural enhancement of $\epp$, within supersymmetric models, comes from chromomagnetic penguins and show that in this case sizable enhancements of $BR(\kpe)_{\rm dir}$ can also be expected. |
| 19 | 1999-08-10 | Standard Model vs New Physics in Rare Kaon Decays | 1999 | LNF-99-022(P).pdf | G. Isidori | We present a brief overview of rare K decays, emphasizing the different role of Standard Model and possible New Physics contributions in various channels. |
| 20 | 1999-08-10 | Supersymmetric contributions to direct CP violation in K-> pi pi gamma decays | 1999 | LNF-99-023(P).pdf | G. Colangelo, G. Isidori, J. Portoles | We analyze the supersymmetric contributions to direct--$CP$--violating observables in $K \to \pi\pi\gamma$ decays induced by gluino--mediated magnetic--penguin operators. We find that $\epsp_{+-\gamma}$ and the differential width asymmetry of $K^\pm \to \pi^\pm \pi^0 \gamma$ decays could be substantially enhanced with respect to their Standard Model values, especially in the scenario where $\epsp/\eps$ is dominated by supersymmetric contributions. These observables could therefore provide a useful tool to search for New Physics effects in $|\Delta S|=1$ transitions, complementary to $\epsp/\eps$ and rare decays. |
| 21 | 1999-08-10 | Models for Photon-Photon Total Cross-Sections | 1999 | LNF-99-024(P).pdf | R.M. Godbole, A. Grau, G. Pancheri | We present here a brief overview of recent models describing the photon-photon cross-section into hadrons. We shall show in detail results from the eikonal minijet model, with and without soft gluon summation. |
| 22 | 1999-08-10 | Epsilon'/Epsilon in the 1/N_c Expansion | 1999 | LNF-99-025(P).pdf | T. Hambye and P.H. Soldan | We present a new analysis of the ratio epsilon'/epsilon which measures the direct CP violation in K ->pi pi decays. We use the 1/N_c expansion within the framework of the effective chiral lagrangian for pseudoscalar mesons. From general counting arguments we show that the matrix element of the operator Q_6 is not protected from possible large 1/N_c corrections beyond its large-N_c or VSA value. Calculating the 1/N_c corrections, we explicitly find that they are large and positive. Our result indicates that a Delta I = 1/2 enhancement is operative for Q_6 similar to the one of Q_1 and Q_2 which dominate the CP conserving amplitude. This enhances epsilon'/epsilon and can bring the standard model prediction close to the measured value for central values of the parameters. |
| 4576 | 1999-08-10 | The Mechanism Inserting the Target Cell of the Hermes Experiment | 1999 | INFN-TC-99-15.pdf | V. Carassiti | A system assembling the target cell of the Hermes experiment on the beam line of the Hera storage ring has been designed. The experiment takes place in Hamburg at DESY laboratory and its aim is to measure the spin distributions of the quarks in proton and neutron. The system includes: - a mechanism opening the downstream spring fingers of the wake field suppressor, allowing the enforced elliptical end of the target cell to slide inside them; - a tooling aligning and positioning the target cell to and along the beam line for both the opening and mounting operations. This paper gives a brief description of the system. |
| 4584 | 1999-08-10 | Trace Element Monitoring in Total Air Particulate and in Inhalable Fractions Investigated by Neutron Activation Analysis | 1999 | INFN-TC-99-16.pdf | D. Arginelli, C. Birattari, M. Gallorini, L. Gini, F. Groppi, E. Rizzio | The concentration of 27 trace elements have been determined in the total air particulate matter as well as in its inhalable size segregated fractions collected in urban, industrialised and rural-residential areas in the North of Italy. By means of multistage inertial impactors trace element granulometric distribution has been measured in the PM10 (particles with an Equivalent Aerodynamic Diameter -AED- of less than $10 \mu m$) and in its subsequent "respirable" fractions (alveolar, bronchial and tracheo-pharynx), which contain particles with nominal diameter from 0 to less than $9 \mu m$. All of the measurements have been carried out by Instrumental Neutron Activation Analysis (INAA). For all investigated elements the granulometric distribution trends found in different locations are reported and compared. |
| 4575 | 1999-08-03 | A Glass Resistive Plate Chamber for Large Production | 1999 | INFN-TC-99-14.pdf | C. Gustavino, M. D’Incecco, E. Tatananni | A new type of glass electrode RPC is described. The design is conceived to allow a large and fast production, good performance and an easy detector operation. These characteristics make the detector suitable for very large arrays, such as future neutrino experiments. |
| 4573 | 1999-07-28 | Simulation Result Comparison on Halo Formation Between Particle-Core Model and a Multiparticle Code | 1999 | INFN-TC-99-13.pdf | V. Variale | Space-charge dominated beams can induce chaotic behavior of particle trajectories leading to halo formation on the beam spot. This causes particle losses along the beam transportation that must be minimized. The fractional losses must be kept below 10-7/m.. This is a very low threshold to check with standard multiparticle codes. To study this kind of problems a particle-core model (PCM) is commonly used. However in this model some approximations are made and then its results need to be checked. In this paper, an inspection on the results of a particular PCM is done by using a multiparticle code with a new particle simulation approach that allows a tight comparison between their results |
| 4574 | 1999-07-28 | Study of Jet Production in p-N Interactions atžs=500 GeV in EAS Multicore Events | 1999 | INFN-AE-99-16.pdf | EAS-TOP Collaboration | The cross section for large $p_{t}$ jet production for transverse momentum $10 \leq p_{t} \leq 20 GeV/c$ and rapidity $1.6 \leq \eta \leq 2.6$ in p-N (p-"air") interactions is studied from the analysis of multicore Extensive Air Showers recorded in the EAS-TOP calorimeter. The projectiles are the le ding particles interacting at atmospheric depths between 250 and $480 cm^{-2}$, the CMS energy of interaction being $\sqrt{s} \approx 500 GeV$. The slope of the $p {t}$ distribution agrees with the expected one from the $p -\overline{p}$ collider data at the same CMS energy.The measured jet production cross section in $p - N$ interactions with respect to $p - \overline{p}$ interactions is $(d\sigma \fraction\dp_{t})^{jet}_{pN}=(d\sigma/dp_{t})^{jet}_p\overline{p}\c dot $A^{\alfa}$ with $\alfa =1.56 \pm 0.07$ for $A =14.7$ (average mass number of "air "nuclei).Such value is compatible within the experimental uncertainties with the one obtained in p - nucleus accelerator measurements at $\sqrt{s} \simeq 30 GeV$ in the same range of transverse momentum and rapidity. No indication of increase of $\alfa$ with energy, i.e. of the entity of the "Cronin effect", is found. |
| 17 | 1999-07-21 | Allocate a Device in UNIX Environment, V 1.0 | 1999 | LNF-99-020(NT).pdf | M. Carboni, S. Angius | |
| 16 | 1999-07-16 | Order-disorder in Olivine Minerals by Synchrotron X-ray Absorption Near-edge Structure (XANES) Spectroscopy at the Mg, Fe and Ca K Edges | 1999 | LNF-99-019(P).pdf | Z. Wu, A.Mottana, E. Paris, G. Giuli, A.Marcelli and G. Cibin | Synchrotron Mg and Fe X-ray absorption near-edge K XANES spectra of the Pbnm olivine series endmembers forsterite (Mg2SiO_4), fayalite (Fe_2SiO_4), monticellite (CaMgSiO_4) and kirschsteinite (CaFeSiO_4), as well as of the intermediate member of the Fe-Mg olivine solid solution series 'hortonolite' (MgFeSiO_4), have been recorded experimentally and calculated by the multiple-scattering theory using clusters of different size and the Xa exchange-correlation potential. Comparison of experimental and theoretical spectra shows that all transition features, energy positions and relative intensities can be reproduced in the energy range up to 60 eV above threshold when using clusters containing at least 80 atoms and extending over a sphere at least 0.6 nm in radius away from the absorber. It also indicates that, at the XANES sensitivity level, Mg and Fe are located entirely in the expected structural sites in all four endmembers, and distribute in 'hortonolite' following a regular order, however with no clear preference for either octahedral site. Thus, atomic order-disorder on a short- to medium-range scale can be detected by the XANES method, hence contributing to understanding the behavior of these materials. The Ca K-edge spectra of monticellite and kirschsteinite have been recorded and calculated too; they are consistent with the assignment of all Ca to the M2 site and confirm that all endmembers of the Pbnm olivine family match the octahedral cation distributions indicated by the ideal crystal structure. |
| 15 | 1999-07-13 | Transition Radiation in the Pre-Wave Zone | 1999 | LNF-99-018(P).pdf | V.A. Verzilov | The wave zone condition for TR produced on the boundary between a metal and vacuum is examined. It is shown that in both forward and backward directions the wave zone sets in at the same distance, that is of the order of the formation length for forward TR. The features of backward TR in the pre-wave zone are considered. |
| 4572 | 1999-07-13 | The Power Supply System of the Tracker Detector for the STS-91 Flight of the AMS Experiment | 1999 | INFN-TC-99-12.pdf | M. Menichelli, A. Banfalvi, R. Battiston, M. Bizzarri, S. Blasko, A. Papi, G. Scolieri | The AMS experiment is designed to search for the antimatter components of cosmic rays, the products of the annihilation of dark matter particles and to perform additional cosmic-ray measurements like spectrum of light nuclei, antiprotons and positrons as well as Iso-topic composition for light elements. The complete AMS instrument will be installed on the space station Alpha in year 2003. A preliminary version of the apparatus has flown in June 1998 on the Space Shuttle mission STS-91. The power supply system of the tracker, described in this paper, has been con-structed optimizing noise performances, following space qualification criteria for a ten day mission on the shuttle and considering the operation in the fringe magnetic field of the spectrometer. This paper also includes a short description of tracker electronics to be powered. Optimisation and qualification tests on the complete power supply system are also reported. |
| 25 | 1999-07-07 | Partial Breaking of N=1, D=10 Supersymmetry | 1999 | LNF-99-017(P).pdf | S. Bellucci, E. Ivanov and S. Krivonos | We describe the spontaneous partial breaking of $N=1,\;D=10$ supersymmetry to $N=(1,0),\;d=6$ and its dimensionally-reduced versions in the framework of nonlinear realizations. The basic Goldstone superfield is $N=(1,0),\;d=6$ hypermultiplet superfield satisfying a nonlinear generalization of the standard hypermultiplet constraint. We interpret the generalized constraint as the manifestly worldvolume supersymmetric form of equations of motion of the type I super $5$-brane in $D=10$. The related issues we address are a possible existence of brane extension of off-shell hypermultiplet actions, the possibility to utilize vector $N=(1,0),\; d=6$ supermultiplet as the Goldstone one, and the description of $1/4$ breaking of $N=1,\;D=11$ supersymmetry. |
| 24 | 1999-07-05 | Analysis of epsilon'/epsilon in the 1/N_c Expansion | 1999 | LNF-99-016(P).pdf | T. Hambye, G.O.Kohler, E.A. Paschos and P.H. Soldan | We present a new analysis of the ratio epsilon'/epsilon which measures the direct CP violation in K -> pi pi decays. We use the 1/N_c expansion within the framework of the effective chiral lagrangian for pseudoscalar mesons. The 1/N_c corrections to the hadronic matrix elements of all operators are calculated at leading order in the chiral expansion. Performing a simple scanning of the input parameters we obtain 1.5 * 10^(-4) < epsilon'/epsilon < 31.6 * 10^(-4). We also investigate, in the chiral limit, the 1/N_c corrections to the operator Q_6 at next-to-leading order in the chiral expansion. We find large positive corrections which further enhance epsilon'/epsilon and can bring the standard model prediction close to the measured value for central values of the parameters. Our result indicates that at the level of the 1/N_c corrections a Delta I = 1/2 enhancement is operative for Q_6 similar to the one of Q_1 and Q_2 which dominate the CP conserving amplitude. |
| 14 | 1999-06-16 | NERO, AN INSTRUMENT TO MEASURE LIGHT ATTENUATION LENGTH IN WATER | 1999 | LNF-99-015(NT).pdf | R.Habel, L.Trasatti, I.Usai | We have built a demonstrator to prove the feasibility of a new instrument to measure the attenuation length of light in very clean waters. The demonstrator has been tested successfully and we are now designing a final version for immersion into the deep. |
| 4563 | 1999-06-16 | Deconfinement and Non-Zero Bayron Density | 1999 | INFN-TH-99-02.pdf | M.P. Lombardo | I discuss a few issues related with deconfinement at finite baryon density by considering lattice results for two colors QCD, and “toy” studies of three colors QCD |
| 23 | 1999-06-14 | Atmoshperic Neutrino Oscillation Results with MACRO at Gran Sasso Laboraratory | 1999 | LNF-99-014(P).pdf | M. Spinelli (for the MACRO collaboration) | We present updated results of the measurement of the atmospheric neutrino flux with the MACRO detector at Gran Sasso, using three data sets spread in a large energy range. In the high energy range, the upgoing throughgoing muon data set is in favor of nmÆnt oscillation hypothesis with a probability of 36.6% against the 0.36% for the no oscillation hypothesis. In the low energy range, the two data set are also in favor to the oscillation hypothesis showing a large defict for IU events and a reduced defict for US+ID events, since only the US events ( |50% ) are expected to oscillate Assuming a nmÆnt oscillation scheme, the results suggest a large range of the parameter values centered around Dm2=0.0025 eV2, sin2 2q = 1. |
| 4566 | 1999-06-04 | Low Energy Atmospheric Neutrino Events in MACRO | 1999 | INFN-AE-99-10.pdf | MACRO Collaboration | The flux to low energy atmospheric neutrinos ($\bar{E}_{\nu}\sim 4 GeV$) has been studied with the MACRO detector at Gran Sasso by detecting ${\nu}_{\mu}$ interactions inside the apparatus, and by upward-going stopping muons. The update analysis of the data collected until now with the complete apparatus will be presented. The results show a deficit of the measured number of events in an uniform way over the whole zenith angle with respect to Monte Carlo predictions. The deficit and the angular distributions when interpreted in terms of neutrino oscillations, are consistent with the MACRO results on the much higher energy upward throughgoing muons ($\bar{E}_{\nu}\sim 100 GeV$). |
| 4567 | 1999-06-04 | MACRO as a Telescope for Neutrino Astronomy | 1999 | INFN-AE-99-11.pdf | MACRO Collaboration | We use a sample of 990 upward-going muons, induced preliminary by atmospheric neutrinos, to search for neutrinos of astrophysical origin. No evidence has been found using the event direction information. Flux limits of the order of $10_{-15} cm_{-2} s_{-1}$ are imposed on current models for candidate point-sources. A spacetime correlation search has been undertaken between 2328 BATSE gamma ray burst (GRBs) and MACRO upward-going muons. |
| 4568 | 1999-06-04 | Search for WIMPS Using Upward-Going Muons in MACRO | 1999 | INFN-AE-99-12.pdf | MACRO Collaboration | We present update results on the search for neutrino signal from the core of the Earth and of the Sun induced by Weakly Interacting Massive Particles (WIMPs). In this paper we concentrate on neutralinos as WIMP Candidates. The 971 and 642 events used respectively for the search from the Sun and from the Earth are compatible with the background of atmospheric neutrinos. Consequently we calculate flux limits for varoius search cones around these sources. Limits as a function of the neutralino mass are given and compared to the supersymmetric (SUSY) models. |
| 4569 | 1999-06-04 | Search for Steady, Modulated and Variable Cosmic Ray Sources Using Undrground Muons in MACRO | 1999 | INFN-AE-99-13.pdf | MACRO Collaboration | Using a sample of 38.5 million underground muons collected by the MACRO detector we have performed an all-sky search for pointlike sources producing excesses of muons above the expected background. The d.c. muon flux upper limit at the Earth coming from selected sources is of the order of $10^{-13} cm^{-2} s^{-1}$ or less. Futhermore we discuss searches for possible modulated and variable sources of muons using different techniques. |
| 4570 | 1999-06-04 | Moon and Sun Shadowing Observed by the MACRO Detector | 1999 | INFN-AE-99-14.pdf | MACRO Collaboration | Using over 40 million muons collected since 1989 by the MACRO detector we have searched for a depletion of muons coming from the direction of the Moon due to primary cosmic rays striking the Moon. We observe this Moon shadow in the expected position with a statistical significance of more than 5 standard deviations. We have analyzed the same data for an analogous Sun shadow, and have found a signal with a significance of about 4 standard deviations. The Sun shadow is displaced from the Sun’s position by about 0.6 degrees North in ecliptic coordinates. This displacement is compatible with a deflection of primary cosmic rays due to the Interplanetary Magnetic Field in the 10-20 TeV primary energy range which is relevant to the underground muons observed by MACRO. |
| 4571 | 1999-06-04 | Transition Radiation Detector in MACRO | 1999 | INFN-AE-99-15.pdf | MACRO Collaboration | The MACRO detector is located in the Gran Sasso Laboratory. MACRO’s overburden varies from 3150 to $7000 hg \fraction cm^{2}$. A transition radiation detector (TRD) has been added to the MACRO detector in order to measure the residual energy of muons entering MACRO, i.e. the energy they have after passing through the Gran Sasso’s rock overburden. The TRD consists of three identical modules with a total horizontal area of $36 m^{2}$. The results presented here are referred to single and double events in MACRO with one muon crossing one of the TRD modules. Our data show that double muons are more energetic than single ones, as predicted by the interaction models of primary cosmic rays with the atmosphere. |
| 4562 | 1999-06-04 | Release of a New Version (V.07-1) of the HEMAS-DPM Monte Carlo. Description and User Manual. | 1999 | INFN-AE-99-07.pdf | G. Battistoni, M. Carboni, C. Forti, J. Ranft | This document gives a short user guide (installation and usage) of a new version (V.07-1) of the HEMAS{DPM Monte Carlo, for the simulation of extensive air showers generated by primary cosmic rays in the energy range 1 ÷ 109 TeV/nucleon. The code is publically available. |
| 4564 | 1999-06-04 | Search for Magnetic Monopoles with MACRO | 1999 | INFN-AE-99-08.pdf | MACRO Collaboration | Data from the complete MACRO Detector have been used to search for magnetic monopoles (MMs) of all expected velocities. Scintillator, stramer tube (instrumented with specialized electronics) and uclear track detectors have been used to search for signatures coming from MMs; the scintillator and nuclear track subdetectors were used also for searches for other rare particles (nuclearites, charged Q-balls). Based on no observation of such signals, we establish stringent flux limits, for MMs as a few 10$^{-5}$c. |
| 4565 | 1999-06-04 | Neutrino Scintillations at High Energy by MACRO | 1999 | INFN-AE-99-09.pdf | MACRO Collaboration | We present update results of the measurement of upward-going muons produced by neutrino interactions in the rock below the MACRO detector. These data support MACRO’s previously published results. They favor a neutrino anomaly. |
| 4560 | 1999-05-24 | Imaging and Profiling of Absorbed Doses in Thermal Neutron Fields for Boron Neutron Capture Therapy (BNCT) | 1999 | INFN-TC-99-10.pdf | G. Gambarini, U. Danesi, P. Marchesi, P. Palazzi, A Pecci | A technique is here described to perform 3-D imaging of absorbed dose by analyzing tissue-equivalent phantoms acting by themselves as continuous dosimeters. The technique is based on a chemical dosimeter incorporated in a tissue-equivalent gel (Agarose). The chemical dosimeter is a ferrous sulphate solution (which is the main component of the standard Fricke dosimeter) added with a metal ion indicator (Xylenol Orange). The absorbed dose is measured by analyzing the variation of gel optical absorption in the visible spectrum, imaged by means of a CCD camera provided with a suitable filter. The designed apparatus and the modality for image detection are described. A method has been studied for dose imaging and profiling in a phantom exposed in thermal neutron fields, also discriminating between various contributions to the absorbed dose. The comparison with the results of other experimental techniques and of simulations reveals that the technique is very promising. |
| 4561 | 1999-05-24 | Study of Electron Beams Induced by Polarised Excimer Laser Beams | 1999 | INFN-TC-99-11.pdf | V. Nassisi, F. Zara | We report on the photoemission of electrons from a GaAs cathode illuminated by a circular polarised laser beam. The maximum output current intensity was 28 mA with 8.8 mJ laser energy. The quantum yield was $1.5x10^{-7}$. This value was limited either to the GaAs work function or the optical transitions involved during the polarised light interaction. Measurements with a no-polarised laser beam were also performed. |
| 13 | 1999-05-20 | Contributions of the LNF ARES Group to the '1999 Particle Accelerator Conference (PAC99) | 1999 | LNF-99-013(P).pdf | M. Castellano, L. Catani, A. Cianchi, M. Ferrario, G. Orlandi, S. Tazzari, F. Tazzioli, V. Verzilov | |
| 4577 | 1999-05-20 | Study of Kinematics of A(a, b)B(c)C Sequential Reaction in the First and Second Stage | 1999 | INFN-BE-99-01.pdf | R.C. Barnà, V. D'Amico, D. De Pasquale, A. Italiano, F. Migliardo, A. Trifirò, M. Trimarchi | We treat the kinematics of a sequential process as A(a,b)B(c)C in its different steps, namely the two-body reaction A(a, b)B and the following $B \rightarrow c + C$ decay. By a proper choice of the reference frames used to describe the reaction, we get useful kinematical formulas whose use makes it easier to understand the physical process considered. |
| 12 | 1999-05-12 | The Single Reflection Regime of X-Rays Travelling into a Monocapillary | 1999 | LNF-99-012(P).pdf | S.B. Dabagov, A. Marcelli | In this manuscript an analysis of the transmission of x-rays through a single monocapillary under the single reflection regime is presented and discussed. Because ray tracing does not allow to explain the experimental data, a first qualitative interpretation of the observed behavior is given in the framework of the wave theory. |
| 4559 | 1999-05-05 | On the possibility of Detecting the $\bar{\nu}_{e}$ Burst from the Collapse of a Neutron Star into a Black Hole | 1999 | INFN-AE-99-06.pdf | W. Fulgione, G. Navarra | The possibility of detecting the $\bar{\nu}_{e}$ burst from the collapse of a neutron star into a black hole is discussed for an existing SN neutrino detector. The expected signal has been evaluated on the basis of the model predictions on the $\nu$ emission and compared with the detector background. The experimental conditions are discussed in order to maximize the signal to noise ratio. A fraction up to 10% (depending on the $\nu$ energy spectrum) of the stars of our Galaxy, distributed through distances which extent up to the Galactic Center, could be observed by a 1 kt liquid scintillator detector such as the Large Volume Detector at Gran Sasso. |
| 4557 | 1999-04-23 | The CERN Neutrino Beam to Gran Sasso (NGS) - Draft of Addendum to Report CERN 98-02, INFN/AE-98/05 | 1999 | INFN-AE-99-05.pdf | J.L. Baldy, A.E. Ball, P. Bonnal, M. Buhler-Broglin, C. Detraz, K. Elsener (ed.), A. Ereditato, P. Faugeras, A. Ferrari, L. Foa’, G. Fortuna, A.L. Grant, A. Guglielmi, A. Hilaire, K. Hübner, M. Jonker, K.H. Kissler, L.A. Maugain,P. Migliozzi, V. Palladino, F. Pietropaolo, J.P. Revol, P. Sala, C. Sanelli,G.R. Stevenson, E. Tsesmeil, N. Vassilopoulos , H. Vincke, E. Weisse, M. Wilhelmsson | The conceptual technical design of the NGS (CERN neutrino beam to Gran Sasso) facility has been presented in the report CERN 98-02 / INFN/AE-98/05. Additional information, in particular an update on various neutrino beam options for the NGS acility, has been provided in a memorandum to the CERN-SPSC committee (CERN-SPSC/98-35). In the present report, further improvements on the NGS design and performance, in particular new scenarios for SPS proton cycles for NGS operation and a new version of the NGS ‘High-energy’ neutrino beam for $\nu_{r}$ appearance experiments, are described. The radiological aspects of the NGS facility have been re-examined. An update version of the NGS construction schedule is presented. |
| 4558 | 1999-04-23 | Proceedings of the Workshop PC-NETS | 1999 | INFN-TC_99-9.pdf | E. Fantozzi, E. Giusti | |
| 4556 | 1999-04-09 | Development of an x-ray Spectrometer for High Lateral Resolution | 1999 | INFN-TC-99-08.pdf | L. Bonizzoni, C. Cicardi, C. De Martinis, A. Galli, M. Milazzo | A table–top micro beam XRF spectrometer based on the properties of capillary optics has been realised. The system is equipped with two beam lines obtained by microcapillary collimators with inner diameter of $400 \m m $ and $100 \mu m$ respectively. The X–ray probe has been characterised in terms of spectral monocromaticity, intensity gain, lateral resolution, beam divergence and intensity. Preliminary applications on ancient layered glasses and plaster detachment stratigraphies are presented. The advantage of the coupling of the microcapillary collimators with an already installed PIXE induced–XRF source is also discussed. |
| 4555 | 1999-04-07 | Guida alla Realizzazione di una Struttura di News Integrata, Tramite INN e VAXnews | 1999 | INFN-TC-99-07.pdf | C. Strizzolo | Questo documento descrive le modalita’ operative per la realizzazione di una struttura di news, basata su un server Usenet installato su un sistema Unix, in grado di interagire con il software VAXnews installato sui sistemi OpenVMS. Tale struttura rappresenta un’evoluzione dei sistemi di news in uso presso molte Sezioni dell’I.N.F.N., utilizzati principalmente al fine di diffondere informazioni di interesse generale, o specifico su determinati argomenti, agli utenti locali. Per lungo tempo, tali sistemi sono stati basati quasi esclusivamente sul softwareVAXnews, disponibile solo su piattaforma VMS/OpenVMS. La struttura proposta consente una manipolazione piu’ agevole delle news su diversi sistemi, e l’installazione della parte centrale del sistema su una piattaforma Unix. |
| 11 | 1999-03-31 | Channeling of Neutrons in Polycapillaires. A New Way to Bend Neutrons at Large Angles | 1999 | LNF-99-011(P).pdf | S.B. Dabagov, A. Marcelli, M.A. Kumakhov | The possibility to bend intense beams of thermal neutrons by means of polycapillary structures is discussed. Accurate theoretical calculations showed how neutron beams may be bent at large angles, through short distance, using multichannel device made by many capillaries are also presented and discussed. |
| 10 | 1999-03-29 | Hadronic Total Cross-sections Through Soft Gluon Summation in Impact Parameter Space | 1999 | LNF-99-010(P).pdf | A. Grau, G. Pancheri, Y.N. Srivastava | The Bloch-Nordsieck model for the parton distribution of hadrons in impact parameter space, constructed using soft gluon summation, is investigated in detail. Its dependence upon the infrared structure of the strong coupling constant $\alpha_s$ is discussed, both for finite as well as singular, but integrable, $\alpha_s$. The formalism is applied to the prediction of total proton-proton and proton-antiproton cross-sections, where screening, due to soft gluon emission from the initial valence quarks, becomes evident. |
| 9 | 1999-03-26 | eta -> pi^+ pi^- pi^0 gamma in Chiral Perturbation Theory | 1999 | LNF-99-009(P).pdf | G. D’Ambrosio, G. Ecker, G. Isidori,, H. Neufelf | We analyse the radiative decay eta -> pi^+ pi^- pi^0 gamma in the low--energy expansion of the Standard Model. We employ the notion of “generalized bremsstrahlung” to take full advantage of the theoretical and experimental information on the corresponding non-radiative eta -> 3 pi decay. The direct emission amplitude of O(p^4) is due to one-loop diagrams with intermediate pions (isospin violating) and kaons (isospin conserving). Vector meson contributions appearing at O(p^6) are also evaluated. |
| 4362 | 1999-03-23 | Production of Like Sign Di-Leptons in pp Collisions Through Composite Majorana Neutrinos | 1999 | INFN-TH-99-01.pdf | O. Panella, C. Carimalo, Y. N. Srivastava | The production of Like-Sign-Di-leptons (LSD), in the high energy lepton number violating ($\Delta L = +2$) reaction, $\, p p \to 2\, \hbox{jets} + \ell^+\ell^+$, ($\ell=e, \mu, \tau$), of interest for the experiments to be performed at the forthcoming Large Hadron Collider (LHC), is investigated in detail, taking up a composite model scenario in which the exchanged virtual composite neutrino is assumed to be a Majorana particle that couples to the light leptons via the $SU(2) \times U(1)$ gauge bosons through a magnetic type coupling ($\sigma_{\mu\nu}$). An helicity projection method is used to evaluate exactly the tree-level amplitudes of the contributing parton subprocesses ($2\to 4$), which allows to take into account all exchange diagrams and occurring inter-ferences. Numerical estimates of the corresponding signal cross-section that implement kinematical cuts needed to suppress the Standard Model background, are presented which show that in some regions of the parameter space the total number of LSD events is well above the background. Assuming non-observation of the LSD signal it is found that LHC would exclude a composite Majorana neutrino up to 850 GeV (if one requires 10 events for discovery). The sensitivity of LHC experiments to the parameter space is then com-pared to that of the next generation of neutrinoless double beta decay ($\beta\beta_{0\nu}$) experiment, GENIUS, and it is shown that they will provide constraints of the same order of magnitude and will play a complementary role. |
| 8 | 1999-03-16 | Bragg reflecting zones from x-ray diffractors with different surface profiles | 1999 | LNF-99-008(P).pdf | A. Marcelli, A.V. Soldatov, M.I. Mazuritsky, V.L. Lyashenko, E.M. Latush | The knowledge of the area and the shape of the crystal surface that reflects x-rays within a fixed range of angles and at a desired spectral resolution is determinant to evaluate the performances of a x-ray diffractor. In the present study a new mathematical approach that allows the calculation of the Bragg reflection zones has been developed and applied to spherical, toroidal and ellipsoidal diffractors. The reflecting areas of ellipsoidal and toroidal diffractors have been calculated as a function of the surface curvature parameters. Maps of the diffraction areas for different Bragg angles and bandwidths will be presented for each diffractors. The limitations of the existing methods, based on the Tailor series expansion, for the theoretical analysis of Bragg reflection zones are also discussed. |
| 7 | 1999-03-08 | The CP-Conserving Contribution to the Transverse muon Polarization in K^+ ->mu^+nu gamma | 1999 | LNF-99-007(P).pdf | G. Hiller, G. Isidori | We present a detailed estimate of the transverse muon polarization ($P_T$) due to electromagnetic final-state interactions in the decay $K^+ \to \mu^+ \nu \gamma$. This $CP$-conserving effect represents the dominant contribution to $P_T$ within the Standard Model. As a result of an explicit calculation, we find that the $CP$-conserving contribution to $P_T$ is quite small, typically of $\cO(10^{-4})$, essentially due to the suppression factor $\alpha/4\pi^2$. This enforces the sensitivity of $P_T$ in probing extensions of the Standard Model with new sources of time-reversal violations. A brief discussion about possible $CP$-violating contributions to $P_T$ in the framework of supersymmetric models with unbroken $R$-parity is also presented. |
| 4361 | 1999-03-04 | Coaxial Wire Technique: A Comparison Between Theory and Experiment | 1999 | INFN-TC-99-06.pdf | D. Davino, M.R. Masullo, V.G. Vaccaro, L. Verolino | The measurement of the scattering(S) matrix inside the coaxial-wire technique is an entry parameter for the calculation of the coupling impedance of an accelerating machine. In order to optimize the method of measuring S-matrices we propose, first, a mathematical technique which allows us to know in advance the most precise coefficients of this matrix for a simple and realistic case. Keeping this as reference point we then describe a measuring procedure which gave results in a very good agreement with the theory. |
| 4359 | 1999-03-02 | Study of the Stability of the LHC Low Beta Inner Triplet for a NB_3SN design | 1999 | INFN-TC-99-4.pdf | G. Ambrosio, F. Broggi, L. Rossi | The inner triplet of the low \beta insertion of LHC is made up of four identical NbTi superconducting quadrupoles. To achieve the nominal luminosity of 10^34cm^-2s^-1 a gradient of 235 T/m is necessary with an aperture of 70 mm. Such a gradient yields a peak field on the coils close to the critical field, endangering the stability for NbTi windings. Improving in the beam and/or collision dynamics depends on the focussing strength of the quads. Nb_3Sn magnet, technologically more complex of the NbTi ones, are a promising solution to improve the gradient beyond the 250 T/m; for this reason we undertook the study of a second generation of low \beta insertions with N_3Sn magnets. Critic for both the construction techniques is the power deposed by the secondary particles generated by the collisions of the 7+7 TeV proton beams. Previous studies estimated the total power released in the NbTi coils to be around 30 W. In this paper different configurations of aperture and gradient of Nb3Sn coils are examined by tracking the reaction products, as from DTUJET code, in the magnetic field structure and evaluating the energy deposition with the FLUKA code. The stability margin of the magnets is then stated with the analysis of the thermal behaviour with the ANSYS code. The better thermal behaviour using aluminum collars instead of stainless steel is shown. The use of cylindrical absorbers under the magnet leads to an unexpected increase of the peak and of the total power in the second quad of about 50% and of 20% respectively. The operating conditions of all the configurations guarantee a safety margin of operation with no need of any kind of absorbers. In the reference case the maximum power and the peak power deposed in the second quadrupole is 22.4 W and 7.2 mW/cm^3 respectively. The study shows Nb_3Sn seems a viable solution for the low b insertion for LHC if gradient in excess of 250 T/m will be required. |
| 4360 | 1999-03-02 | Longitudinal Coupling Impedance of an Annular Ring | 1999 | INFN-TC-99-05.pdf | M.R. Masullo, G. Panariello, F. Schettino, V.G. Vaccaro, L. Verolino | In this paper we propose a new method to evaluate the longitudinal coupling impedance of a charged particle passing perpendicularly through the centre of a perfectly conducting annular ring. It is shown that the solution of the problem can be expressed as a double Neumann series, whose expansion coefficients can be easily computed. Moreover we show the causality of the wake field for a particle travelling at the speed of light. |
| 3 | 1999-02-22 | Non-Universal Temperature Dependencies of the Low Frequency as Magnetic Susceptibility in High Tc Superconductors | 1999 | LNF-99-003(P).pdf | D. Di Gioacchino, F. Celani, P. Tripodi, A.M. Testa, S. Pace | The complex ac magnetic susceptibilities (cn = c'n + icn') of high Tc superconductors in absence of dc fields have been studied by numerically solving the nonlinear diffusion equation for the magnetic flux, where the diffusivity is determined by the resistivity. In our approach the parallel resistor model between the creep and flux flow resistivities is used, so that the crossover between different flux dynamic processes (thermally activated flux flow, flux creep, flux flow) can naturally arise. For this reason we remark that, as the frequency increases, the presence of a different non linearity in different regions of the I-V characteristic determines non-universal temperature dependencies of the cn, i.e. the cn are found to be not universal functions of a frequency and temperature dependent single parameter. Moreover, the actual frequency dependent behavior is also shown to be strictly related to the particular pinning model chosen for the simulations. Indeed, for large values of the reduced pinning potential (U/KT*220) and for increasing frequency, a transition has been observed between dynamic regimes dominated by creep and flux flow processes. On the other hand, for smaller reduced pinning potentials, a transition from the thermally activated flux flow (Taff) to the flow regime occurs. In qualitative agreement with available experimental data but in contrast with previously used simpler models, the amplitude of the peak of the imaginary part of the first harmonic is shown to be frequency dependent. Moreover the frequency dependence of its peak temperature shows large discrepancies with approximated analytical predictions. Finally, the shape of the temperature dependencies of the higher harmonics are found to be strongly affected by the frequency. |
| 4358 | 1999-02-15 | Integrated Front-End for a Large Strip Detector with E, DE and Position Measurement | 1999 | INFN-TC-99-03.pdf | N. Randazzo, G.V. Russo, C. Caligiore, D. Lo Presti, C. Petta, S. Reito, L. Todaro, G. Fallica, G. Valvo, M. Lattuada, S. Romano, A. Tumino | A large strip detector for position and energy measurement of heavy ions in a 100 MeV range has been realised. An improved version with an epitaxial thick layer for \deltaE measurement is foreseen. This paper describes a charge preamplifier–shaper dedicated to an optimal use of the mentioned detector whose charge extracted will be holes. The dynamic range of 14 bit and 11 bit are expected for E and \deltaE measurements, respectively. |
| 6 | 1999-02-12 | Eikonalise minijet model Predictions for Cross-Sections of Photon Induced Processes | 1999 | LNF-99-006(P).pdf | R.M. Godbole, G. Pancheri | In this talk we present the results of an analysis of total and inelastic hadronic cross-sections for photon induced processes in the framework of an eikonalised minijet model(EMM). We fix the various input parameters to the EMM calculations by using the data on photoproduction cross-sections and then make predictions for \siggmhad\ using {\it same} values of the parameters. We then compare our predictions with the recent measurements of \siggmhad\ from LEP. We also show that in the framework of the EMM the rise with \rts\ of the total/inelastic cross-sections will be faster for photon induced processes than for the processes induced by hadrons like protons. |
| 5 | 1999-02-08 | Effects of Diffraction and Target Finite Size on Coherent Transition Radiation Spectra in Bunch Length Measurements | 1999 | LNF-99-005(P).pdf | M. Castellano, A. Cianchi G. Orlandi and V.A. Verzilov | Effects of diffraction and size of the target on TR in the context of CTR-based bunch length measurements are studied on the basis of Kirckoff diffraction theory. Spectra of TR from the finite-size target for several schemes of measurements are calculated in the far-infrared region showing strong distortion at low frequencies. Influence of the effect on the accuracy of bunch length measurements is estimated. |
| 4 | 1999-02-03 | Precision Tests and Searches for New Physics with K Decays | 1999 | LNF-99-004(P).pdf | G. Isidori | A short overview of FCNC and CP-violating observable in K decays is presented. Particular attention is paid to the possibility of performing precision tests of flavour dynamics and to the search for New Physics. |
| 4357 | 1999-01-26 | High Statistics Measurement of the Underground Muon Pair Separation at Gran Sasso | 1999 | INFN-AE-99-04.pdf | The MACRO Collaboration | We present a measurement of the underground decoherence function using multimuon events observed in the MACRO detector at Gran Sasso at an average depth of 3800 hg/cm2. Muon pair separations up to 70m have been measured, corresponding to parent mesons with $P\bot\leg1\div2$ GeV/c. Improved selection criteria are used to reduce detector effects mainly in the low distance separation region of muon pairs. Special care is given to a new unfolding procedure designed to minimize systematic errors in the numerical algorithm. The accuracy of the measurement is such that the possible contribution of rare processes, such as $\mu^{\pm} + N \rightarrow \mu^{\pm} + N + \mu^{+} + \mu^{-}$, can be experimentally studied. The measured decoherence function is compared with the predictions of the hadronic interaction model of the HEMAS Monte Carlo code. Good agreement is obtained. We interpret this agreement to indicate that no anomalous $P \bot$ components in soft hadron-Nucleus and Nucleus-Nucleus collisions are required by the MACRO experimental data. Preliminary comparisons with other Monte Carlo codes point out that the uncertainties associated with the hadronic interaction model may be as large as 20%, depending on the energy. MACRO data can be used as a benchmark for future work on the discrimination of shower models in the primary energy region around and below the knee of the spectrum. |
| 4356 | 1999-01-20 | Antimatter, just a “Semantic” Question | 1999 | INFN-AE-99-03.pdf | P. Spillantini | In the field of Cosmology most of the scientific works concerning the question of the matter-antimatter asymmetry of the universe deal with the baryonic matter without mentioning the role and the evolution of the leptonic matter. The observation of this lack gave rise to the attempt outlined in this letter of including also the leptons in the simple scheme of a matter-antimatter asymmetry originated from CP violation in the breaking of the supersymmetric state of the primordial Universe. A further reason, much more speculative and “academic”, for such an attempt could be found in the dissatisfaction for the final fate of an”all-matter”Universe that the possible decay of the proton drives to an “all-antimatter” Universe. It must anyway be underlined that this argument, even if it could have an aesthetic merit, cannot at all be regarded as a scientific one: the mean life of the proton is in any case long, exceeding by tens of order of magnitude the present life time of the Universe, that any extrapolation of the evolution of the Universe on such a long time scale is a nonsense. |
| 2 | 1999-01-14 | The Local Structure of Ca-Na pyroxenes. II – XANES studies at the Mg and Al K edges | 1999 | LNF-99-002(P).pdf | A. Mottana, T. Murata, A. Marcelli, Z.Y. Wu, G. Cibin, E. Paris and G. Giuli | X-ray absorption spectra at the Mg and Al K edges have been recorded on synthetic endmember diopside (Di) and jadeite (Jd) and on a series of natural Fe-poor Ca-Na clinopyroxenes compositionally straddling the Jd-Di join. The spectra of C2/c members of the series (C-omphacites) are different from having P2/n symmetry (P-omphacites). Differences can be explained by theoretical spectra calculated via the multiple-scattering formalism on atomic clusters with at least 89 atoms, extending to ca. 0.62 nm away from the Mg viz. Al absorber: XANES detects in these systems medium- rather than short-range order-disorder relationships. Near-edge features of C-omphacites reflect the single-type of octahedral arrangement of the back scattering nearest-neighbours (six O atoms) around the absorber (Mg resp. Al) at the centre of the cluster (site M1). Others arise again from medium-range order. P-omphacites show more complicated spectra than C-omphacites. Their additional features reflect the increased local disorder around the probed atom (Mg resp. Al) induced by the two alternative M1, M11 configurations of the six O atoms forming the first co-ordination spheres. Mg and Al are confirmed to be preferentially partitioned in the M1 resp. M11 site of the P-omphacite crystal structure, however never exclusively, but in a ratio close to 85:15 (±10%) that implies a certain degree of local disorder. Changes in the relative heights of some prominent features are more evident in the Al than in the Mg K-edge spectra. They are diagnostic to qualitatively distinguish C- from P-omphacites |
| 4354 | 1999-01-14 | The Role of Semiclassical Description in the Quantum-like Theory of Light Rays | 1999 | INFN-TC-99-02.pdf | R. Fedele, V.I. Man’ko | A procedure alternative to the one {\it ala Gloge and Marcuse} to perform the {\it transition} from geometrical optics to the wave optics in paraxial approximation is presented. This is done by employing a recent {\it deformation} method used to give a {\it quantum-like} phase-space description of charged-particle beam transport in semiclassical approximation. By taking into account the uncertainty relation (diffraction limit) that holds between the transverse beam spot size and the r.m.s. of the light-ray slopes, the classical phase-space equation for light rays is {\it deformed} into a von Neumann-like equation which governs the phase-space description of the beam transport in semiclassical approximation. Here, $\hbar$ and the time are replaced by the inverse of the wavenumber,$\not\!\lambda$, and the propagation coordinate, respectively. In this framework, the corresponding Wigner-like picture is given and the quantum-like corrections for an arbitrary refractive index are considered. In particular, it is shown that the paraxial radiation beam transport can be also described in terms of a fluid motion equation where the pressure term is replaced by a {\it quantum-like potential} in semiclassical approximation which accounts for the diffraction of the beam. Finally, a comparison of this fluid model with the Madelug's fluid model is performed. |
| 4355 | 1999-01-14 | Radiation Shielding of Spacecrafts in Interplanetary Flights | 1999 | INFN-AE-99-02.pdf | P. Spillantini, F. Tacetti, P. Papini, L. Rossi | During the interplanetary flights the crew members will be exposed to cosmic ray radiation, with great risk for their health. The absorbed dose due to CR depends on the galactic (GCR) or solar (SCR) origin. GCRs are isotropic, and relatively high in energy and deliver a dose nearly constant, with the time, that can be reduced only by means of “heavy” passive protections. The SCRs up to a few tens of MeV are usually shielded by the outer walls of the spacecraft, but during some exceptional solar bursts, a grat number of particles, mainly protons, are ejected at higher energies. In this case the dose given in a few hours by a solar burst can easily exceed 1 year cumulated dose by GCRs. The high energy component of SCRs is quai-directional so that a shielding system based on a superconductive magnetic lens can reduce the daily dose of SCRs to the only one delivered by GCRs. |
| 4353 | 1999-01-13 | An UHV Transportable Container Based on a NEG Pump | 1999 | INFN-TC-99-01.pdf | A. Dacca’, A. Pozzo | Our works concerns the attainment of UHV pressures by using the non evaporable getter (NEG) pump in conjunction with turbomolecular or ion pump of small size. Studies related to surface science show that vacuum conditions in the range of UHV ($10-^{10}$ mbar) are required for very reactive materials, such as niobium or titanium elements. It is a very common practice to perform some surface treatments on these materials and then facing with the problem to preseve the surface state so created from the atmospherical contamination for long times (storing, transport from one laboratory to another, etc.) The aim of this work is to find a vacuum system that is easy to construct, inexpensive and almost completely free from any kind of power supply. |
| 1 | 1999-01-12 | Do Cosmic Rays Perturb the Operation of a Large Resonant Spherical Detector of Gravitational Waves? | 1999 | LNF-99-001(IR).pdf | G. Pizzella | The sensitivity of resonant gravitational wave detectors is reviewed. The effect of cosmic rays on a large spherical detector is considered. It is shown that the sensitivity to short bursts, to monochromatic and to stochastic GW is not significantly degraded by cosmic rays. This means that it is not necessary to install a large resonant detector in an underground laboratory and supports the idea to install it near a GW interferometer. |
| 4352 | 1999-01-08 | Limits on Drak Matter WIMPs Using Upward-Going Muons in the MACRO detector | 1999 | INFN-AE-99-01.pdf | The Macro Collaboration | We perform an indirect search for Weakly Interacting Massive Particles (WIMPs) using the MACRO detector to look for neutrino-induced upward-going muons resulting from the annihilation of WIMPs trapped in the Sun and Earth. The search is conduced in various angular cones centres on the Sun and Earth to accomodate a range of WIMP masses. No significant excess over the background from atmospheric neutrinos is seen and limits are placed on the upward-going muon fluxes from Sun and Earth. These limits are used to constrain neutralino particle parameters from supersymmetric theory, including those suggested by recent results from DAMA/NaI. |
| 81 | 1998-12-17 | FINUDA, the Facility | 1998 | LNF-98-045.pdf | V. Lucherini for the Finuda Collaboration | The status of the FI.NU.DA. (Fisica Nucleare a DAFNE) facility of Frascati Laboratories is reviewed. The performance of FINUDA, in terms of resolution and rates of produced hypernuclei, is compared with the other existing facilities. The brakthrough in the field of hypernuclear studies, due to the unique combination of slow, monochromatic, low-background K-’s produced at the DAFNE F-factory with the high resolution, large acceptance spectrometer is underlined. |
| 79 | 1998-12-16 | A Modification of the 10D Superparticle Action Inspired by the Gupta-Bleuler Quantization Scheme | 1998 | LNF-98-043.pdf | S. Bellucci, A. Galajinsky | We reconsider the issue of the existence of a complex structure in the Gupta-Bleuler quantization scheme. We prove an existence theorem for the complex structure associated with the d=10 Casalbuoni-Brink-schwarz superparticle, based on an explicity constructed Lagrangian that allows a holomorphic-antiholomorphic splitting of the fermionic constraints consistent with the vanishing of all first class constraints on the physical states. |
| 80 | 1998-12-16 | New Analysis of the DI=1/2 Rule in Kaon Decays and the ^BK Parameter | 1998 | LNF-98-044(P).pdf | T. Hambye, G.O. Köhler, P.H. Soldan | |
| 78 | 1998-12-10 | Performance of the Electromagnetic Calorimeter of the HERMES Experiment | 1998 | LNF-98-042.pdf | H. Avakian, N. Bianchi, G.P. Capitani, E. De Sanctis, P. Di Nezza, A Fantoni, V.Giourdjian, R. Mozzetti, V. Muccifora, M. Nupieri, A.R. Reolon, P. Rossi, J.F.J. van den Brand, M. Doets, T. Henkes, M. Kolstein, A. Airapetian, N. Akopov, M. Amarian, R. Avakian, A. Avetissian, V. Garibian, S. Taroian | The Performance of the electromagnetic calorimeter of the HERMES experiment is described. The calorimeter consists of 840 radiation resistant F101 lead-glass counters. The response to positrons up to 27.5 GeV, the comparison between the measured energy and the momentum reconstructed from tracking, long-term stability, hadron rejection and neutral meson invariant mass reconstruction are shown. |
| 4350 | 1998-12-10 | The Target Stick of the Polarised Proton and Deutron Target of CLAS | 1998 | INFN-TC-98-38.pdf | M. Anghinolfi, P. Cocconi, R. De Vita, C. Pizzorno, F. Parodi, A. Rottura | |
| 4351 | 1998-12-10 | Utilizzo di BSD Sendmail Come Relax Centralizzato | 1998 | INFN-TC-98-39.pdf | G. Lo Biondo, M. Campanella, L. Carbone, M. Meroni, F. Prelz | |
| 77 | 1998-11-27 | Theoretical Reappraisal of Branching Ratios and CP Asymmetries in the Decays BÆ(Xd, Xs)l+l- and Determination of the CKM Parameter | 1998 | LNF-98-041(P).pdf | A. Ali, G. Hiller | |
| 4332 | 1998-11-27 | The Influence of the Galatic Magnetic Field on the Age of Cosmic Ray Protons | 1998 | INFN-AE-98-24.pdf | M.T. Brunetti, A. Codino | The influence of various magnetic field structures of the galactic disk on some fundamental properties of cosmic ray protons has been investigated with a simulation program which generates cosmic ray trajectories in the disk volume. The regular component of the galactic magnetic field has been approxirnated by three different geometrical configurations (circular, elliptic and spiral). Ages, residence times and grammages of cosmic protons in various conditions are calculated and discussed. These calculations indicate that the proton age is strongly influenced by the magnetic field configuration, but weakly affected by the magnetic field strength. The age of cosmic ray protons in the spiraI field has a calculated value of 6.7.10^6 years and the corresponding matter thickness 12 g/cm^2• |
| 4333 | 1998-11-27 | Design and Performance of a Magnetic Spectrometer for Antimatter Search in Space | 1998 | INFN-AE_98-25.pdf | M. Menichelli for the AMS Coolaboration | |
| 4349 | 1998-11-27 | Design and Performances of a Multichannel Multisampling Analog to DIGITAL Converter Board for Energy Measurement | 1998 | INFN-TC_98-37.pdf | P. Musico, A. Nostro | |
| 4347 | 1998-11-26 | Analytical Study of the Behaviour of a Cold Mass Support During the Cooldown and the Energization of the ATLAS Barrel Toroid | 1998 | INFN-TC_98-35.pdf | F. Alessandria, G. Ambrosio | |
| 4348 | 1998-11-26 | Study of the Thermal Shield of the ATLAS Barrel Toroid in Case of a Fast Discharge | 1998 | INFN-TC_98-36.pdf | F. Alessandria, G. Ambrosio | |
| 4346 | 1998-11-24 | Modulation Instabilities and Landau Damping within the Thermal Wave Model Description of High-Energy Charged-Particle Beam Dynamics | 1998 | INFN-TC_98-34.pdf | D. Anderson, R. Fedele, V.G. Vaccaro, M. Lisak, A. Berntson, S. Johanson | |
| 76 | 1998-11-23 | NESTOR:an Underwater Neutrino Observatory in the Ionian Sea | 1998 | LNF-98-040.pdf | NESTOR Collaboration (Presented by L. Trasatti) | Deep underwater high energy neutrino detection is a very promising field in both elementary particle physics and astrophysics. On one side, the energy range of ground based accelerators cannot be extended much more respect to the present, leaving only astronomical sources for future investigations. In the astrophysics field, neutrinos are the tool to explore further in the universe due to their low interactions. By the same token, the experimental problems for a neutrino detector are enormous. The Cerenkov effect is practically the only possible tool, because it uses sea water both as shield and as detector. NESTOR is the first step toward a full fledged deep underwater neutrino experiment. While its area, of the order of 100000 m**2, cannot hope to identify all possible celestial sources, it is nevertheless a necessary step toward the “Km**3” experiment. The first deployment tests have already been performed, proving the feasibility of the mechanical design, and the electronics is almost completely ready. Additional tests are scheduled fir this autumn and next year will see a relevant part of the experiment installed at the bottom of the Ionian see. |
| 4344 | 1998-11-23 | Proposed Architecture of a Flexible Small-Scale Parallel System for the Control of a Detector Array | 1998 | INFN-TC_98-32.pdf | Chimera Collaboration | |
| 4345 | 1998-11-23 | The APEOS Project: Architecture of the APEmille operating System | 1998 | INFN-TC_98-33.pdf | C. Battista and APE Collaboration | |
| 74 | 1998-11-17 | Recovery of the Magnetic Ordering in Y1-xCexMn2 Induced by Hydrogen Absorption | 1998 | LNF-98-038.pdf | A. Marcelli, M. Battisti, G. Cibin, J. Chaboy, C. Piquer, L. Bozukov | The substitution of Ce by Y in YMn2 leads to the destabilization of the Mn magnetic moment and inhibits both the transition to antiferromagnetism and the associated expansion of the crystal cell observed in pure YMn 2. We show in this work how hydrogen uptake in the Y1-xCexMn2 series gives rise to the recovery of long-range magnetic ordering in these system. The analysis of magnetic and x-ray-absorption spectroscopy experiments addresses the critical role played by the modification of the Ce electronic state in the stabilization of the Mn magnetic through the hybridization changes. |
| 75 | 1998-11-17 | The DEAR Case | 1998 | LNF-98-039(P).pdf | The DEAR Collaboration: S. Bianco, A.M. Bragadireanu, F.L. Fabbri, C. Guaraldo, M. Iliescu, T.M. Ito, V. Lucherini, C. Petrascu, M. Bregant, E. Milotti, A. Vacchi, E. Zavattini, M. Augsburger, D. Chatellard, P. Knowles, F. Mulhauser, L.A. Schaller, L. Schellenberg, H. Schneuwly, J.-P. Egger, D. Varidel, W.H. Breunlich, M. Cargnelli, B. Gartner, R. King, B. Lauss, J. Marton, J. Zmeskal, T. Ponta, S.N. Nakamura, T. Koike, R.S. Hayano, M. Hori, T. Ishikawa, T. Ishiwatari, M. Iwasaki, Y. Akaishi, G. Beer, A.C. Sanderson, R. Seki | The scientific program and the experimental setup of the DEAR (DAFNE Exotic Atom Research) experiment at the new f–factory DAFNE of Laboratori Nazionali di Frascati, are described. The objective of DEAR is to perform a 1% measurement of the Ka line shift due to the strong interaction in kaonic hydrogen. A measurement will also be performed on kaonic deuterium for the first time. The aim is to investigate low-energy KN physics and to understand SU(3) chiral symmetry breaking. The setup takes advantage of the unique features of the “kaon beam” from the f decay in DAFNE; of a low-temperature pressurized gaseous target; and of a detector for soft X rays – the Charge-Coupled Device (CCD) – characterized by a good resolution and by an unprecedented background rejection capability. The DEAR experiment represents a major effort in the study of low energy KN interactions and has the potential to produce a breakthrough in the field. |
| 4343 | 1998-11-17 | An Automatic Winding Machine Making Superconducting Coils for the LHC Correction Magnets | 1998 | INFN-TC_98-31.pdf | V. Carassiti, S. Chiozzi, F. Evangelisti, P. Ferretti, G. Bonora, M. Melchiorri, M. Rubbi, N. Tezzon, C. Fantuzzi, S. Simani | |
| 4336 | 1998-11-16 | Quantum Gravity Effects Near the Null Black Hole Singularity | 1998 | INFN-TH_98-5.pdf | A. Bonanno, M. Reuter | |
| 4331 | 1998-11-12 | Performances of the · 100 kg NaI(Tl) set-up of the DAMA experiment at Gran Sasso | 1998 | INFN-AE_98-23.pdf | DAMA Collboration | |
| 73 | 1998-11-04 | Evidence for Al/Si tetrahedral Network in Aluminosilicate Glasses from Al K-Edge X-Ray Absorption Spectroscopy | 1998 | LNF-98-037(P).pdf | Ziyu Wu, C. Romano, A. Marcelli, A. Mottana, G. Cibin, G. Della Ventura, G. Giuli, P. Courtial, D.B. Dingwell | The structure of aluminosilicate melts/glasses plays a key role in the Earth Sciences for the understanding of rock-forming igneous processes, as well as in the Materials Sciences for their technical applications. In particular, the alkaline earth aluminosilicate glasses are an extremely important group of materials, with a wide range of commercial application, as well as serving as analogue for natural basaltic melts. However, definition of their struc-ture and properties is still controversial, and in particular the role and effect of Al has long been a subject of debate. [1–8] Here we report a series of experimental x-ray absorption near-edge structure (XANES) spectra at the Al K edge on a series of synthetic glasses of peralkaline composition in the CaO- Al_2 O–3-SiO-_2 system, together with a general theoret-ical framework for data analysis based on an \it{ab initio} full multiple scattering (MS) the-ory. We propose an Al/Si tetrahedral network model for aluminosilicate glasses based on distorted polyhedra, with varying both the T-O (T = Al or Si) bond lengths and the T-O-T angles, and with different Al/Si composition. This model achieves a significant agreement between experiments and simulations. In these glasses, experimental data and theoretical results concur to support a model in which Al is network-former with a comparatively well ordered local medium-range order (up to 5 Ý A). |
| 4341 | 1998-10-30 | IPv6: Introduzione al Protocollo e Test Effettuati al CNAF | 1998 | INFN-TC_98-29.pdf | A. Chirici, L. dell'Agnello, A. Ghiselli, C. Vistoli | |
| 4342 | 1998-10-30 | MI.D.A.S.: a Forward Detector for the GDH Experiment st Mainz | 1998 | INFN-TC_98-30.pdf | S. Altieri, O. Barnaba, A. Braghieri, M. Cambiaghi, A. Lanza, T. Locatelli, A. Panzeri, P. Pedroni, T. Pinelli | |
| 4340 | 1998-10-28 | Characterisation and Measurement of Silicon Detectors | 1998 | INFN-TC-98-28.pdf | V. Bonvicini | |
| 72 | 1998-10-27 | Solution to the Inverse Problem for a Noisy Spherical Gravitational Wave Antenna | 1998 | LNF-98-036(P).pdf | S.M. Merkowitz | |
| 71 | 1998-10-26 | Beam Diagnostic Using Transition Radiation Produced by the LISA Electron Beam | 1998 | LNF-98-035(IR).pdf | M. Boscolo | |
| 4334 | 1998-10-26 | The 11B+12C Few-Nucleon Transfer Reaction in the C.M. Energy Range from 5 to 40 MeV: a Comparative Study of Different Reaction Mechanism | 1998 | INFN-BE_98-1.pdf | R. Barna', D. De Pasquale, A. Italiano, F. Migliardo | |
| 4335 | 1998-10-26 | Angular Correlation as a Poerful Tool in the Study of Heavy Ion Induced Peripheral Reaction Mechanism | 1998 | INFN-BE_98-2.pdf | R. Barna', , D. De Pasquale, A. Italiano, F. Migliardo | |
| 4338 | 1998-10-26 | Nonlinear Fluid Effects on the Longitudinal Instabilities of Coastng Beams | 1998 | INFN-TC_98-26.pdf | G. Miano, G. Rumolo, C. Serpico, I. Hofmann | |
| 4339 | 1998-10-26 | A Warm Fluid Model for Coasting Beam Longitudinal Instabilities | 1998 | INFN-TC_98-27.pdf | G. Miano, G. Rumolo, I. Hofmann | |
| 70 | 1998-10-16 | The Muon and Neutral Hadron Detector for BaBar | 1998 | LNF-98-034.pdf | F. Anulli, A. Asmone, R. Baldini Ferroli, K. van Bibber, R.M. Bionta, A. Buzzo, A. Calcaterra, G.P. Carlino, N. Cavallo, R. Contri, G. Crosetti, R. de Sangro, F. Fabozzi, D. Falciai, T.V.Franchi, J.R. Johnson, L. Lista, M. Lo Vetere, M. Macrì, S. Mele, R. Monge, A. Palano, M. Pallavicini, P. Paolucci, P. Parascandolo, C. Patrignani, I. Peruzzi, M.G. Pia, D. Piccolo, M. Piccolo, E. Robutti, A. Santroni, C. Sciacca, T.T. Wenaus, D.M. Wright, Z. Yu, A. Zallo | The muon and neutral hadron detector of the BaBar expriment for the PEP-II Asymmetric B-factory at SLAC uses Resistive Plate Counters (RPCs) as active detectors. A large fraction of the total system, which consists of approximately 800 chambers for an overall surface of 2000 m2, has already been built and tested in cosmic rays. Preliminary results of the operating characteristics with new non-flammable and environmentally safe gas mixture are reported. |
| 68 | 1998-10-08 | Change of the HTSC Harmonic Susceptibility Properties with Electrlytic Hydrogen Loading Using Different Aqueous Solution as LiOH and NaOH | 1998 | LNF-98-032(P).pdf | P. Tripodi, D. Di Gioacchino, F. Celani, A. Spallone, D. Vinko | The higher harmonics magnetic susceptibilities (c=ci'+ici') of HTSC hydrogen loaded as function of the temperature at 6G of ac magnetic field amplitude at 107Hz of frequency have been measured. The samples have been loaded by electrolysis in an aqueous solution using µs current pulses at room temperature. The HTSC electrodes have been polarized by short pulse width (1µs) and high peak current (*4A) with a low duty–cycle (10–3) and a variable repetition rate (1–5KHz). The hydrogen influence on HTSC (Tc, ac losses) has been measured and the increasing of the superconducting properties, particularly Tc and Jc, have been found. These effects appear strongly dependent to the loading process and to the stoichiometric ratio H/YBCO. It has been demonstrated that the electrolyte (Li, Na) do not affect the YBCO superconducting properties. |
| 69 | 1998-10-08 | Numerical Study of the Frequency and Temperature Dependence of the ac Magnetic Field in HTS | 1998 | LNF-98-33(P).pdf | D. Di Gioacchino, P. Tripodi, F. Celani, A.M. Testa, S. Pace | The temperature dependence of the harmonics (cn) of the ac magnetic susceptibility in HTS have been investigated by numerical solutions of the non linear diffusion equation for the magnetic flux. Within the framework of the collective pinning model, we show that the transition between different regimes for the flux dynamics (taff, creep, flow) is determined by the field frequency for a fixed dc field, or by the dc field for a fixed frequency. As a consequence, a non universal behavior arises for the temperature dependence of cn. In particular, in this approach the frequency dependencies of both amplitude and temperature of the peak of the imaginary part of the first harmonic and of the modulus of the third harmonic are discussed. |
| 4337 | 1998-10-07 | The Multidetector 'Chimera' Motherboards System | 1998 | INFN-TC-98-25.pdf | D. Nicotra, G. Sacca', M. D'Andrea, F. Fichera, N. Guardone | This report describes a system, designed for the analog front-end of the multidetector 'CHIMERA' and the adopted procedures for reduce the crosstalk, due to electromagnetic coupling or through the preamplifiers common power supply lines. An accurate study of the current limiting circuit and of the power supply filter, which are provided the motherboards, by using SPICE simulation is also presented. |
| 4329 | 1998-10-01 | The EAS Size Spectrum and the Cosmic Ray Energy Spectrum in the region 1015 - 1016eV | 1998 | INFN-AE-98-21.pdf | EAS-TOP Collaboration | |
| 4330 | 1998-10-01 | The Hadron Calorimeter of EAS-TOP: Operation, Calibration and Resolution | 1998 | INFN-AE-98-22.pdf | EAS-TOP Collaboration | |
| 67 | 1998-09-21 | The Beamline SINBAD at DAFNE | 1998 | LNF-98-031.pdf | A. Marcelli, E. Burattini, A. Nucara, P. Calvani, G. Cinque, C. Mencuccini, S. Lupi, F. Monti, M. Sanchez Del Rio | SINBAD, the first beamline in Italy designed to work in the far-and-mid-infrared region, is being installed on DAFNE storage ring, the new F-factory at Laboratori Nazionali di Frascati. DAFNE, first injected in September 1997, will work at 0.51 GeV with a beam current in the range 2-5 A. The infrared synchrotron radiation extracted from a bending magnet is expected to be more brilliant than a black body at 2000K up to three orders of magnitude in the wavelength range 10-1000 mm. The optical layout of SINBAD, fully designed by ray tracing simulation, includes six mirrors placed in a 18m long beamline. The infrared radiation is first focused on a wedged diamond window and then re-focused on the entrance of a Michelson interferometer. Diffraction effects and mirror roughness, as well as optical aberrations, have been evaluated. |
| 4299 | 1998-09-21 | On a Further Search for a Yearly Modulation of the Rate in Particle Dark Matter Direct Search | 1998 | INFN-AE-98-20.pdf | R. Bernabei, P. Belli, F. Montecchia, W. Di Nicolantonio, G. Ignesti, A. Incicchitti, D. Prosperi, C.J. Dai, L.K. Ding, H.H. Kuang, J.M. Ma | |
| 4328 | 1998-09-21 | Piano Esecutivo della Rete Garr-B | 1998 | INFN-TC_98-24.pdf | M.C. Vistoli | |
| 65 | 1998-09-11 | SINBAD, a Brilliant IR Source from the DAFNE Storage Ring | 1998 | LNF-98-029.pdf | A. Marcelli, E. Burattini, C. Mencuccini, P. Calvani, A. Nucara, S. Lupi, M. Sanchez Del Rio | SINBAD is the italian IR synchrotron Radiation beamline, designed to work at wavelenghts than 10mm. It is being installed on DAFNE, a new collider that is designed to work at 0.51 GeV with a beam current up to 5 A. Due to such a High current, the IR extracted from a bending manet will be more brilliant than that of a blal body at 2000 K by two orders of magnitude at 100mm. The beamline optical system, projected by ray-tracing simulation, consists of six mirrors that first focus the radiation on a wedged CVD diamond-film window and then transfer collimated beam to the experimental area where a Michelson interferometer will be installed |
| 66 | 1998-09-11 | Local-Structure Determination in T- and T1- Phase Materials by 2p x-Ray Absorption Spectra of La, Nd, Y, and Sr | 1998 | LNF-98-030.pdf | Z. Wu, M. Benfatto, C.R. Natoli | |
| 4321 | 1998-09-11 | Primary Ionization and Energy Loss Calculation for Helium, Neon, Argon and Krypton | 1998 | INFN-TC_98-22.pdf | E. Santovetti, L. Cerrito | |
| 4322 | 1998-09-11 | Cluster Counting in a Large Drift Chamber in He 80%-CH420% at Normal Conditions | 1998 | INFN-TC_98-23.pdf | L. Cerrito, M. Gatta, L. Paoluzi, E. Santovetti | |
| 4320 | 1998-09-10 | The ASF Project at INFN: Development of a High Level Administration Layer | 1998 | INFN-TC_98-21.pdf | M. Castellano, G. Tomasicchio, A. Ventrella | |
| 63 | 1998-09-01 | NESTOR Optical Modules Blackening | 1998 | LNF-98-027(NT).pdf | M. Cordelli, A. Rutili, L. Trasatti | The optical modules (OM) containing the photomultiplier tubes (PM) for a deep sea neutrino telescope must be protected them from direct sunlight. The problem has been solved using a heat shrink plastic sheet with very good optical and mechanical properties. |
| 62 | 1998-08-25 | Supersimmetric Contributions to Rare Kaon Decays: Beyond the Single Mass-Insertion Approximation | 1998 | LNF-98-026(P).pdf | G. Colangelo, G. Isidori | |
| 61 | 1998-07-31 | Physics at DAFNE | 1998 | LNF-98-025(P).pdf | G. Pancheri | The main physics items to be studied in the f–facory DAFNE under commissioning in Frascati are discussed. Experimental searches for CP violation, study of chiral structure of pseudoscalar and vector mesons, pion-pion phase shifts, hadronic e+ e– cross-sections will be studied with the detector KLOE, nuclear physics with kaons will be investigated with the detector FINUDA and formation of Kaonic atoms with the detector DEAR. |
| 4318 | 1998-07-31 | Studio dei Sistemi di Cablaggio Strutturato per la Rete Dipartimentale della Sezione di Roma | 1998 | INFN-TC_98-19.pdf | C. Battista, E. Leonardi, A. Spanu | |
| 4319 | 1998-07-31 | Progetto per la Nuova LAN del Dipartimento di Fisica dell'Università degli Studi di Roma 'La Sapienza' | 1998 | INFN-TC_98-20.pdf | C. Battista, E. Leonardi, A. Spanu, E. Valente | |
| 60 | 1998-07-30 | Nucleon Time-Like Form Factors Below the N`N Threshold | 1998 | LNF-98-024(IR).pdf | R. Baldini, S. Dubnicka, P. Gauzzi, S. Pacetti, E. Pasqualucci, Y. Srivastava | The nucleon magnetic form factors in the unphysical region, i.e. for time-like Q2 but below the N`N threshold, have been obtained by means of dispersion relations in a model independent way, without any bias towards expected resonances. Space-like and time-like data have been employed along with a regularization unfolding method to solve integral equation. Remarkably, resonance structures with peaks for the r(770) and r´(1600) and a structure near the N`N threshold are automatically generated. The obtained r has a much larger width, whose significance is explored. No evidence is found for a peak at the F mass, in spite of the expectation if there is a sizeable polarized s`s content in the nucleon. |
| 59 | 1998-07-27 | DAFNE Machine Project | 1998 | LNF-98-023(P).pdf | G. Vignola and DAFNE Commissioning Team | No abstract |
| 4317 | 1998-07-17 | Methods for Precise Photoelectron Counting with Photomultipliers | 1998 | INFN-TC-98-18.pdf | Dossi, A. Ianni | |
| 4316 | 1998-07-13 | Coupled Microwave Cavities for the Detection of Small Harmonic Displacements | 1998 | INFN-TC_98-17.pdf | Ph. Bernard, G. Gemme, R. Parodi, E. Picasso | |
| 4298 | 1998-07-13 | Dal Gran Sasso al Supermondo | 1998 | INFN-AE_98-19.pdf | Maiani, Zichichi | |
| 4315 | 1998-07-10 | Studio dei Sistemi di Cablaggio in Fibra Ottica per la Realizzazione del Backbone della Rete Locale Dipartimentale | 1998 | INFN-TC_98-16.pdf | C. Battista, E. Leonardi, A. Spanu | |
| 4297 | 1998-07-07 | A New Readout Technique for Method the Time of Flight of Ionizing Particles | 1998 | INFN-AE_98-18.pdf | A. Codino | |
| 4295 | 1998-07-06 | Some Results from the Thin Gap Gas Chamber Detector Prototype for the DELPHI End-Caps | 1998 | INFN-AE_98-16.pdf | E. Albrecht, P. Niezurawski, O. Ullaland, A. Markou, P. Adzik, F. Fontanelli, V. Gracco, A. Morelli, P. Morettini, A. Petrolini, G. Piana, M. Pernicka | |
| 4296 | 1998-07-06 | Recent Physics Results with the Ring Imaging Cherenkov Detector of the DELPHI Experiment at LEP | 1998 | INFN-AE_98-17.pdf | A. Petrolini | |
| 4294 | 1998-07-03 | Measurement of the Energy Spectrum of Underground Muons at Gran Sasso with a Transition Radiation Detector | 1998 | INFN-AE-98-15.pdf | The MACRO Collaboration | |
| 4292 | 1998-07-01 | Measurement of the Atmospheric Neutrino-Induced Upgoing Muon Flux Using MACRO | 1998 | INFN-AE-98-13.pdf | The MACRO Collaboration | |
| 4293 | 1998-07-01 | Observation of the Shadowing of Cosmic Rays by the Moon Using a Deep Underground Detector | 1998 | INFN-AE-98-14.pdf | The MACRO Collaboration | |
| 57 | 1998-06-26 | The CP Conserving Contribution to KLÆ p0 in the Standard Model | 1998 | LNF-98-021(P).pdf | G. Buchalla and G. Isidori | The are decay KLÆ p0 nn is dominated by direct CP violation and can be computed with extraordinarily high precision. In principle also a CP conserving contribution to this process can arise within the Standard Model. We clarify the structure of the CP conserving mechanism, analyzing both its short–distance and long-distance components. It is pointed out that the calculation of the CP conserving amplitude, although sensitive in part to nonperturbative physics, is rather well under control. The resulting CP conserving contribution to the KLÆ p0 nn rate turns out to be very strongly suppressed due to several factors, which we discuss in detail. |
| 56 | 1998-06-24 | Supersymmetric Hadronic Bound State Detection at e+e– Colliders | 1998 | LNF-98-020(P).pdf | M. Antonelli, N. Fabiano | We review the possibility of formation for a bound state made out of a stop quark and its antiparticle. The detection of a signal from its decay has been investigated for the case of e+e– collider. |
| 4313 | 1998-06-16 | Analisi AES di Wafer Costituenti il Rivelatore a Pixel dell'Esperimento ATLAS | 1998 | INFN-TC-98-13.pdf | A. Daccà, G. Gemme, R. Parodi | |
| 4314 | 1998-06-16 | ATLAS Pixel Detector Bump Bonding Stress Analysis | 1998 | INFN-TC_98-14.pdf | M. Olcese, S. Farinon | |
| 4326 | 1998-06-12 | Limiting SUSY-QCD Spectrum and its Application for Decays of Superheavy Particles | 1998 | INFN-TH-98-04.pdf | V. Berezinsky, M. Kachelrieb | |
| 54 | 1998-06-09 | The Effect of g-b Phase on H(D)/Pd Overloading | 1998 | LNF-98-018(P).pdf | F. Celani, A. Spallone, P. Tripodi, D. Di Gioacchino, S. Pace, G. Selvaggi, P. Marini, V. Di Stefano, M. Nakamura, A. Mancini | It will be shown, using long and thin wires of Pd, that the Electromigration is a powerful tool to increase the H(D) loading in Pd only, and only if, some proper experimental set-up and conditions are fulfilled. Some of key interrelated parameters are: wire diameter, effective wire temperature, strong barriers at most and less cathodic side, anode-cathode and intercathodic voltages, current densities, proper impurities and the Pd surface, ageing effects. |
| 55 | 1998-06-04 | Preliminary Results with “Cincinnati Group Cell” on Thorium “Transumation” Under 50Hz AC Excitation | 1998 | LNF-98-019(P).pdf | F. Celani, M. Achilli, A. Battaglia, C. Cattaneo, C. Buzzanca, P.G. Sona, A. Mancini | We give the procedure and the results of experiments performed with a standard “Cincinati Group Cell”, aimed to observe possible “transmutation” of Th in other elements via an AC electrolytic process. Three techniques have been used to avoid bias due to spurious effects: a-radiometry, ICP/MS and ICP/optical, looking at difference between initial and final solution and between blank (no Th) and black (with Th) processed solutions. We found deficit of Th after process and new elements produced. The results are still not conclusive on transmutation and we discuss arguments in favour and against the transmutation hypothesis. We clarify the critical points of the measurements techniques, adding some suggestions to improve the reliability of results in future measurements. |
| 53 | 1998-06-01 | Spatial Resolution in Optical Transition Radiation (OTR) Beam Diagnostics | 1998 | LNF-98-017.pdf | M. Castellano and V.A. Verzilov | An evaluation of the OTR single particle image dimension is obtained using diffraction theory based on a realistic description of the radiation source. This approach allows the analysis of the effect of the finite size of the emitting screen and of the imaging system. The role of practical experimental conditions in treating the intensity tail problem is estimated. It is shown that by exploiting the polarization properties of OTR, a considerable enhancement in the spatial resolution can be achieved, which becomes very similar to that of a standard point source. |
| 4291 | 1998-06-01 | The 51Cr and 90Sr Sources in Borexino as Tool for Neutrino Magnetic Moment Searches | 1998 | INFN-AE_98-12.pdf | A. Ianni, D. Montanino | |
| 4290 | 1998-05-25 | Deformation Measurements in a Model of the Coil Suspensions for the ATLAS Barrel Toroid and the B0 Model | 1998 | INFN-AE_98-11.pdf | F. Broggi, B. Gallet | |
| 4312 | 1998-05-22 | Boron Neutron Capture Therapy. Oncological, Radiobiological, Chemical and Radiation Physics Aspects in the BNC Tecnique Present and Future in Italy | 1998 | INFN-TC_98-12.pdf | G. Tornielli, P. Colautti | |
| 4300 | 1998-05-12 | XPS and AES Analysis of Ozonided Ultrapure Water Treatment of NB Surface for SCRF Cavities | 1998 | INFN-FM_98-1.pdf | A. Daccà, G. Gemme, R. Parodi, K. Asano | |
| 52 | 1998-05-05 | On the Efficiency of the Coincidence search in Gravitational Wave Experiments | 1998 | LNF-98-016.pdf | P. Astone, G.V. Pallottino and G. Pizzella | We discuss the problem of the detection of gravitational waves (gw) signals with small energy signal to noise ratio (SNR). We consider coincidence experiments between data processed by optimum filters matched to delta–like bursts. It as shown, by calculation and by simulation, that, because of the noise, the “events” lists produced by the same signals on different detectors, using the same filters, overlap only partially — about 30 percent for SNR close to the threshold used for defining the events. Furthermore, because of the noise, the correlation of the event energy between identical detectors is weak and cannot be used as a strong discriminator against noise in coincidence search, even for SNR = 10 or more. |
| 4289 | 1998-04-27 | Presupernova Gamma-Burst and Some Conseguences of ‡Vep Reaction | 1998 | INFN-AE_98-10.pdf | O.G. Ryazhskaya | |
| 4288 | 1998-04-27 | The NOE Detector for a Long Baseline Neutrino Oscillation Experiment | 1998 | INFN-AE-98-09.pdf | G. De Cataldo, L. De Benedictis, C. Favuzzi, P. Fusco, N. Giglietto, A. Rainò, M.N. Mazziotta, P. Spinelli, A. Margiotta, M. Spurio, A. Di Credico, A. Grillo, C. Gustavino, S. Mikeyev, E. Scapparone, P. Bernardini, G. Mancarella, D. Martello, A. Surdo, R.A.Mukhamedshin, G.T. Zatsepin, V.A. Smotryaev, I.S. Trostin, K.V. Alexandrov, V.A. Chechin, A.P. Chubenko, A.D. Erlykin, F.F. Kayumov, S.K. Kotel'nikov, E.P. Kuznetsov, B.N. Lomonosov, G.I. Merzon, V.A. Ryabov, V.O. Tikhomirov, V.A. Tsarev, A.M. Baranov, E.T. Gushchin, V.A. Kantserov, A.A. Semak, S.V. Somov, M. Ambrosio, C. Aramo, G.C. Barbarino, D. Campana, F. Guarino, A. Lauro, A. Ordine, U. Rubizzo | |
| 51 | 1998-04-23 | Biosimetric Diagnostic Profile | 1998 | LNF-98-015.pdf | E. Righi, C. Catena, D. Conti, G. Trenta | No abstract |
| 4287 | 1998-04-22 | Introduction of a Quantum of Time ('Chronon') and its Consequences for Quantum Mechanics | 1998 | INFN-AE_98-8.pdf | R.H.A. Farias, E. Recami | |
| 50 | 1998-04-21 | New Evaluation of the Baldin Sum Rule | 1998 | LNF-98-014.pdf | D. Babusci, G. Giordano, G. Matone | The Baldin sum rule for the nucleon has been recalculated at the light of the most recent photoabsorption cross section measurements. The proton value (a+b)p=13.69±0.14 is smaller but consistent with the one usually quoted in literature. However, the value for the neutron (a+b)n=14.40±0.66 turns out to be three standard deviations away from the previously calculated one. |
| 48 | 1998-04-20 | Operation of the Gravitational Wave Detector NAUTILUS | 1998 | LNF-98-012(P).pdf | P. Astone, M. Bassan P. Bonifazi, P. Carelli, E. Coccia, V. Fafone, S. Frasca, A. Marini, S.M. Merkowitz, Y. Minenkov, I. Modena, G. Modestino, A. Moleti, G.V. Pallottino, M.A. Papa, G. Pizzella, F. Ronga, R. Terenzi, M. Visco, L. Votano | The ultracryogenic resonant–mass gravitational wave (GW) detector NAUTILUS of the Rome group is in continuos operation at the Frascati INFN National Laboratories since December 1995. The detector is cooled at about 0.1 K. The measured spectral amplitude sensitivity is h 6 10–22 Hz–1/2, with a bandwidth of about 1 Hz, and the best pulse sensitivity is of the order of h · 4 10–19. We describe the detector performances, the search for monochromatic wave and the first experiment of cross–correlation between the data obtained with NAUTILUS and Explorer, the detector of the Rome group located at CERN. |
| 49 | 1998-04-20 | Superconducting Superstructure for the TESLA Collider | 1998 | LNF-98-013(P).pdf | J. Sekutowicz, M. Ferrario, C. Tang | We discuss the new layout of a cavity chain (superstructure) allowing, we hope, significant cost reduction of the RF system of both linacs of the TESLA linear collider. The proposed scheme increases the fill factor and thus makes an effective gradient of an accelerator higher. We present mainly computations we have performed up to now and which encouraged us to order the copper model of the scheme, still keeping in mind that experiments with a beam will be necessary to prove if the proposed solution can be used for the acceleration. |
| 4286 | 1998-04-20 | Curvature Misidentification in a Magnet Spectrometer | 1998 | INFN-AE_98-7.pdf | M.T. Brunetti, A. Codino | |
| 4285 | 1998-04-17 | The Cosmic Ray Proton and Helium Nuclei Flux between 0.2 and 200 GV | 1998 | INFN-AE-98-06.pdf | M. Boezio, P. Carlson, T. Francke, N. Weber, M. Suffert, M. Hof, W. Menn, M. Simon, S.A. Stephens, R. Bellotti, F. Cafagna, M. Castellano, M. Circella, G. De Cataldo, C. De Marzo, N. Giglietto, P. Spinelli, P. Papini, S. Piccardi, P. Spillantini, M. Ricci, A. Codino, N. Finetti, C. Grimani | |
| 47 | 1998-04-16 | A New Photoelectron Imager for X-Ray Astronomical Polarimetry | 1998 | LNF-98-011(P).pdf | A. La Monaca, E. Costa, P. Soffitta, G. Di Persio, M. Manzan, B. Martino, G. Patria, G. Cappuccio, N. Zema | A new photoelectron imager for X–ray astronomical polarimetry (PIAP) has been developed and tested at the Frascati laboratories (LNF–INFN). A charge–coupled device (CCD) is placed on one of the two conjugate foci of a Cassegrain reflective optics onto which are focused UV photons emitted by means of gas scintillation. This X–ray detector has been built to image the angular distribution of the photoelectron tracks, whose anisotropy measures the X–ray polarization. First tests, performed by using mixtures based on argon gas and benzene at low pressure, show events which are candidate tracks of photoelectrons and Auger electrons produced by a 55Fe source. |
| 4311 | 1998-04-10 | Studio del Comportamento dei Cavi Superconduttori ad Alta Temperatura Critica e Costruzione di Prototipi di Avvolgimenti Magnetici. Accordo CISE-Europa Metalli-INFN | 1998 | INFN-TC_98-11.pdf | L. Rossi, G. Volpini, L. Bigoni, S. Zannella, R. Garrè | |
| 46 | 1998-03-19 | Determination of Local Structure in Monofase Palladium by X-Ray Absorption Spectroscopy | 1998 | LNF-98-009.pdf | F. Boscherini, S. de Panfilis, J. Wissmüller | We report a comprehensive investigation of nanophase palladium by x-ray-absorption spectroscopy with the aim of clarifying the issue of the structure of the grain boundaries in nanophase materials. In fact, since the proposal that the gain boundaries in these materials are disordered, various techniques have obtained conflicting results on this issue. Until two recent brief reports (one of which was our own) x-ray-absorption spectroscopy investigations have supported the view of highly disordered grain boundary regions due to the finding of greatly reduced average coordination number. Contrary to previous reports we find that the reduction in average coordination numbers is smaller that previously reported (at most 4±0.03% for the first shell) and can be explained by a size effect due to the non-negligible interface-to-bulk ratio of the samples. The analysis of the x-ray-absorption data has been extended up to the eight coordination shell taking into account the important multiple-scattering path. |
| 45 | 1998-03-17 | The pT Spectrum in Heavy-Flavour Hadroproduction | 1998 | LNF-98-8(P).pdf | M. Cacciari, M. Greco, P. Nason | We consider the transverse-momentum distribution of heavy flavours in hadronic collisions. We present a formalism in which large tranverse-momentum logarithms are resumed at the next-to-leading level, and mass effects are included exactly up to order a3s, so as to retain predictivity at both small and large transverse momenta. An an example, we apply our formalism to b production at the Tevatron. |
| 44 | 1998-03-16 | A Preliminary D/Pd Loading Study: Anomalous Resistivity Transition Effect | 1998 | LNF-98-007(P).pdf | F. Celani, A. Spallone, P. Tripodi, D. Di Gioacchino, G. A. Selvaggi, P. Marini, V. Di Stefano, S. Pace, A. Mancini | Several tests has been performed trying to over–load (D/Pd> 0.8) a Pd wire with Deuterium by mean of electrolytic procedures. A proper elicoidal electrodes geometry has been adopted to provide opportune electric fields during the electrolysis and several picks up has been located along the wires to obtain a profile of wire Deuterium concentration by mean the resistivity.Tests operated with high electric current (up to 1 A) flowing along the wire and low electrolytic voltage showed a D/Pd loading of 0.75 at maximum. Tests operated with high voltage (from 50 to 100 V) have showed in some cases an overcoming of D/Pd= 0.95. In these cases an anomalous effect of cyclical loading/deloading has been newly observed by this group. No average anomalous heat in excess (more than 15%) has been observed during these tests. |
| 4323 | 1998-03-12 | Photon Splitting Above the Pair Creation Threshold on Very Strong Magnetic Fields | 1998 | INFN-TH-98-01.pdf | M. Kachelrieb, G. Wunner | |
| 4324 | 1998-03-12 | Neutrino Self-Energy and Pair Creation in Neutron Stars | 1998 | INFN-TH-98-02.pdf | M. Kachelrieb | |
| 4325 | 1998-03-12 | Ultra High Energy Cosmic Rays | 1998 | INFN-TH_98-3.pdf | V. Berezinsky | |
| 43 | 1998-03-04 | Misura della Sezione d’Urto di Fotoassorbimento tra 0.5 e 2.6 GeV su Nuclei ed Analisi dei Dati –Tesi di Dottorato | 1998 | LNF-98-006(IR).pdf | M. Mirazita | The total photoabsorption cross section on several nuclei has been measured in the energy range 0.5 - 2.6 GeV. Nuclear data show a significant reduction of the absorption strength with respect to the free nucleon case suggesting a shadowing effect at low energies. |
| 42 | 1998-03-03 | Interference Effects on the Coupling Impedance of Many Holes in a Coaxial Beam Pipe | 1998 | LNF-98-005.pdf | S. De Santis, A. Mostacci, L. Palumbo | The problem of many holes in a coaxial beam pipe is studied by means of the modified Bethe theory. The electromagnetic fields propagating in the coaxial region couple the equivalent dipole moments of the holes. The effect of the coupling on the longitudinal impedance and on the loss factor is investigated, showing that the interference phenomena are significant for such geometries. |
| 4310 | 1998-03-03 | Summary of Mechanical Thermal and Magnet Analyses on CMS Cold Mass Made at INFN Genova During 1997 | 1998 | INFN-TC_98-10.pdf | P. Fabbricatore, S. Farinon | |
| 4309 | 1998-03-03 | Test di Laboratorio sulla Simulazione della Connessione ATM a 34 Mb/s Via Ponte Radio fra i Laboratori Nazionali di Frascati e la Sezione INFN di Roma1 | 1998 | INFN-TC_98-9.pdf | A. Brunengo, T. Ferrari, C. Olivieri, C. Salvo | |
| 4284 | 1998-02-26 | The CERN Neutrino Beam to Gran Sasso. Conceptual Technical Design | 1998 | INFN-AE_98-5.pdf | G. Acquistapace, J.L. Baldy, A.E. Ball, P. Bonnal, M. Buhler-Brogin, F. Carminati, E. Cennini, K. Elsener, A. Ereditato, V. Falaleev, P. Faugeras, A. Ferrari, L. Foa', G. Fortuna, R. Genand, A.L. Grant, L. Henny, A. Hilaire, K. Hubner, J. Inigo-Golfin, K.H. Kissler, L.A. Lopez-Hernandez, J.M. Maugain, M. Mayoud, P. Migliozzi, D. Missiaen, V. Palladino, I.M. Papadopoulos, S. Péraire, F. Pietropaolo, S. Rangod, J.P. Revol, J. Roche, P. Sala, C. Sanelli , G.R. Stevenson, B. Tomat, E. Tsesmelis, R. Valbuena, H. Vincke, E. Weisse, M. Wilhelmsson | |
| 4306 | 1998-02-26 | Test of a Silica Aerogel Threshold Cherenkov Counter for the TJNAF Hall A Spectrometers with 1-4 GeV/c Particles | 1998 | INFN-TC_98-6.pdf | R. Perrino, L. Lagamba, E. Cisbani, S. Colilli, R. Crateri, R. De Leo, S. Frullani, F. Garibaldi, F. Giuliani, M. Gricia, M. Iodice, A. Leone, M. Lucentini, A. Mostarda, E. Nappi, L. Pierangeli, F. Santavenere, G.M. Urciuoli | |
| 4307 | 1998-02-26 | The LNGS AFS Cell | 1998 | INFN-TC-98-07.pdf | A. D'Ambrosio, S. Parlati | |
| 4305 | 1998-02-18 | A New Approach for the Protection System of the Superconducting Coils in the Barrel Toroid of ATLAS | 1998 | INFN-TC_98-5.pdf | E. Acerbi, G. Ambrosio, G. Baccaglioni, M. Sorbi, G. Volpini | |
| 41 | 1998-02-17 | Seraching for KL Æ p0 n n at a f-factory | 1998 | LNF-98-004(P).pdf | F. Bossi, G. Colangelo and G. Isidori | The perspectives of a search for the rare decay KLÆp0nn at a f–factory are discussed. After a general analysis, we focus on the realistic case of KLOE and DAFNE, showing that limits of the order of 10–9 on BR(KLÆp0nn ) are achievable in the next few years. We also discuss the theoretical implications of this kind of measurements. |
| 4303 | 1998-02-02 | 3D Positron Emission Tomografy: a Monte Carlo Study of Scattered Radiation | 1998 | INFN-TC_98-3.pdf | E. Bellotti, V. Bettinardi, M.C. Gilardi, G. Rizzo, A. Savi, S. Schubert, C. Stearn | |
| 4304 | 1998-02-02 | Characterization of Electron Beams Generated from Cu Photocathodes | 1998 | INFN-TC_98-4.pdf | V. Nassisi, E. Gianico | |
| 4283 | 1998-01-30 | Extreme Energy Cosmic Rays (EECR) Observation Capabilities of an 'Airwatch from Space Mission' | 1998 | INFN-AE_98-4.pdf | The Airwatch Collaboration | |
| 39 | 1998-01-28 | Strangeness in Nuclear Matter at DAFNE | 1998 | LNF-98-002(P).pdf | P. Gianotti | The low energy kaons from the f meson produced at DAFNE offer a unique opportunity to study strangeness in nuclear matter. The interaction of kaons with hadronic matter can be investigated at DAFNE using three main approaches: study of hypernuclei production and decay, kaons scattering on nucleons, kaonic atoms formation. These studies explore kaon-nucleon and hyperon-nucleon forces at very low energy, the nuclear shell model in presence of strangeness quantum number and eventual quarks deconfinement phenomena. The experiments devoted to study this physical program at DAFNE are FINUDA and DEAR. The physics topics of both experiments are illustrated together with a detailed descriptions of the two detectors. |
| 40 | 1998-01-28 | Nonperturbative Effects in \overline{B}$\to X_s \l^+ \l^-$ for Large Dilepton Invariant Mass | 1998 | LNF-98-003(P).pdf | G. Buchalla, G. Isidori | We reconsider the calculation of O(\Lambda^{2}_{QCD}=m^{2}_{b}$) nonperturbative corrections to $B\to X_s \l^+ \l^-$ decay. Our analysis confirms the results of Ali et al. for the dilepton invariant mass spectrum, which were in disagreement with an earlier publication, and for the lepton forward-backward asymmetry. We also give expressions for the &O(\Lambda^{2}_{QCD}=m^{2}_{b}$) corrections to the left-right asymmetry. In addition we discuss the breakdown of the heavy quark expansion near the point of maximal dilepton invariant mass $q^2$ and consider a model independent approach to this region using heavy hadron chiral perturbation theory. The modes $BXl^+l^-$ and $B \to X_\mu \l^+ \l^-$, which determine the endpoint region of the inclusive decay, are analysed within this framework. An interpolation is suggested between the region of moderately high $q^2$, where the heavy quark expansion is still valid, and the vicinity of the endpoint described by chiral perturbation theory. We also comment on further nonperturbative effects in $B\to X_s \l^+ \l^-$. |
| 4302 | 1998-01-28 | Sperimentazioni ATM per l'utilizzo di reti LAN e WAN ad alta velocità | 1998 | INFN-TC_98-2.pdf | S. Alborghetti, C. Battista, A. Brunengo, M. Campanelle, F. D'Isep, T. Ferrari, L. Gaido, A. Ghiselli, P. Matteuzzi, C. Olivieri, A. Re, C. Salvo, S. Spanu, E. Valente, C. Vistoli, S. Zani | |
| 38 | 1998-01-27 | Search for Correlation of Gamma Ray Bursts with Gravitational Wave Data | 1998 | LNF-98-001(P).pdf | P. Astone, M. Bassan, P. Bonifazi, P. Carelli, E. Coccia, V. Fafone, L. Febo, S. Frasca, A. Marini, S.M. Merkowitz, Y. Minenkov, I. Modena, G, Modestino, A. Moleti, G.V. Palladino, M.A. Papa, G. Pizzella, F. Ronga, R. Terenzi, M. Visco, L. Votano | The first extensive search for time correlation between gamma ray bursts (GRB) and the data recorded with resonant gravitational wave (GW) antennas is presented and discussed. The “average” algorithm is applied to the GW data obtained in correspondence of a time window of ± 20 minutes centered at the GRB trigger time. No significant effect is found at a level of GW bursts with amplitude h | 2 ·10–19. |
| 4282 | 1998-01-16 | Simulation of Nuclear Effects in Quasi Elastic and Resonant Neutrino Interactions | 1998 | INFN-AE_98-3.pdf | G. Battistoni, P. Lipari, J. Ranft, E. Scapparone | |
| 4280 | 1998-01-08 | Can the Nonrelativistic Quark Model Be Reconciled with Deep Inelastic Scattering Results? | 1998 | INFN-AE_98-1.pdf | E. Di Salvo | |
| 4301 | 1998-01-08 | Il Sistema di Distribuzione Gas della Sezione di Genova | 1998 | INFN-TC_98-1.pdf | M. Olcese | |
| 4281 | 1998-01-08 | Charmonium Production at FNAL/E771 | 1998 | INFN-AE_98-2.pdf | V. Elia, E. Gorini, F. Grancagnolo | |
| 127 | 1997-12-19 | The DAFNE Cryogenic System | 1997 | LNF-97-046(NT).pdf | M. Modena | The DAFNE Project utilises superconductivity technology for a total of six superconducting magnets: the two Experiment magnets (KLOE and FINUDA) and the four Compensator Solenoid magnets needed to compensate the magnetic effect of the Experiment magnets on the electron and positron beams. This effect, on beams of 510 MeV (nominal DAFNE Energy), is expected to be relevant, especially with the aim of achieving a very high luminosity, which is the main target of the Project. The KLOE superconducting magnet has two possible working positions: the first in the DAFNE Hall, when the Experiment will be in operation, and the second one in the KLOE Assembly Hall. This second position is the first to be utilised for the KLOE magnet Acceptance Test and magnetic field mapping, prior to the mounting of all the experimental apparatus inside the magnet.This note intends to present the DAFNE Cryogenic System and how we have converged to the definition of a common Cryogenic System compatible with all the six super-conducting magnets. |
| 128 | 1997-12-19 | Temperature Dependence of non-Debye Disorder in Doped Manganites | 1997 | LNF-97-47.pdf | C. Meneghini, R. Cimino, S. Pascarelli, S. Mobilio, C. Raghu, D.D. Sarma | Ca-doped manganite La1-xCaxMnO3 samples with x=0.2 and 0.4 were investigated by extended x-ray absorption fine structure (EXAFS) as a function of temperature and preparation method. The samples exhibit characteristic resistivity change across the metal-insulator (MI) transition temperature whose shape and position depend on Ca-doping concentration and sample thermal treatment. EXAFS results evidenced an increase of nonthermal disorder at the MI transition temperature which is significantly correlated with the resistivity behavior. |
| 129 | 1997-12-19 | 3rd European Workshop on “ Beam Diagnostics and Instrumentation for Particle Accelerators” DIPAC 97 – 12-14 October 1997 | 1997 | LNF-97-048(IR).pdf | AA.VV | |
| 4268 | 1997-12-15 | A Multichannel Analog Pulse Generator | 1997 | INFN-TC_97-36.pdf | F. Fabozzi, P. Parascandolo | |
| 126 | 1997-12-10 | Survey and Alignment of the KLOE Experiment at DAFNE | 1997 | LNF-97-045(P).pdf | A. Ceccarelli, S. Dell'Agnello, A. Di Virgilio, S. Moccia | This review describes the survey and alignment program completed for the construction and the installation of the KLOE experiment from September 1995 to October 1997. |
| 82 | 1997-12-09 | Theoretical Analysis of X-Ray-Absorption Near-Edge Fine Structure and Metal K Edges of LaFeO3 and LaCoO3 | 1997 | LNF-97-044.pdf | Z.Y. Wu, M. Benfatto, M. Pedio, R. Cimino, S. Mobilio, S.R. Barman, K. Maiti, D.D. Sarma | We present experimental x-ray-absorption spectra at the oxygen and 3d transition-metal K edges of LaFeO3 and LaCoO3. We interpret the experimental results in terms of detailed theoretical calculations besed on multiple-scattering theory. Along with providing an understanding of the origin of various experimental features, we investigate the effects of structural distorsions and the core-hole potential in determining the experimental spectral shape. The results indicate that the core-hole potential as well as many-body effects within the valence electrons do not have any strong effect on the spectra suggesting that the spectral features can be directly interpreted in terms of the electronic structure of such compounds. |
| 125 | 1997-12-03 | Presented Status of the Frascati National Laboratories | 1997 | LNF-97-43.pdf | P. Laurelli | The Frascati National Laboratories are the largest INFN Laboratory, with a long standing tradition in constructing and operating e+e- storage rings and large size detectors. The present status of the experimental programs is reviewed, with special emphasis to DAFNE and its experiments. |
| 124 | 1997-11-28 | Sinbad: The New Powerful Infrared Source from the DAFNE Storage Ring | 1997 | LNF-97-42.pdf | A. Marcelli, E. Burattini, C. Mencuccini, A. Nucara, P. Calvani, S. Lupi, M. Sanchez del Rio | We report on the status of the first Italian Infrared Synchrotron Radiation Beamline SINBAD (Synchrotron INfrared Beamline At DAFNE), that has been designed to work at wavelengths greater than 10 mm. SINBAD is being installed on DAFNE, the new collider of the Laboratori Nazionali di Frascati designed to work at 0.51 GeV with a beam current of 2 to 5 A. The infrared radiation extracted from a bending magnet under an angle of 50x50 mrad will be two orders of magnitude more brilliant than that of a black body at 2000 K at a wavelength of 100 mm. The beamline layout, which consists of two plane mirrors, two toroidal mirrors, and one aspherical mirror, has been designed by ray tracing simulation. In this layout one ellipsoid focuses the radiation on a wedged CVD diamond-film window, the beam is than re-focused again on the entrance of an interferometer. With a calculated transmittance of the optics between 60% and 80% at 50 mm, this beamline will allow experiments which require a very high brilliance in the far infrared. |
| 123 | 1997-11-27 | Characterization of Local Chemistry and Disorder in Synthetic and Natural a-Al2O3 Materials by x-ray Absorption Near Edge Structure Spectroscopy | 1997 | LNF-97-041(P).pdf | A. Mottana, T. Murata, A. Marcelli, G. Della Ventura, G. Cibin, Z. Wu, R. Tessadri | X-ray absorption fine spectra at the Al K-edge were measured experimentally on and calculated theoretically via the multiple-scattering formalism for a chemically pure and physically perfect synthetic a-Al2O3 (a-alumina), a natural “ruby/sapphire” (corundum) and a series of artificial “corundums” produced for technical purposes and used as geochemical standards. The Al K-edge spectra differ despite of the identical coordination (short-range arrangement) assumed by O around Al, and vary slightly in relation to the slightly different chemistries of the materials (substitutional defects) as well as on account of the location taken by foreign atoms in the structural lattices (positional defects). A quantitative treatment of the observed changes is made in terms of short-range modification of the coordination polyhedron and of medium- to long-range modifications in the overall structure; both of them induced by substitutions. In some technical “corundums”, the impurities of admixed “b-alumina”, where Al is both in four- and six-fold coordination, produce another small but detectable effect on Al K-edges. Therefore, XAFS spectroscopy proves its potentials for both measuring a light element such as Al, and detecting minor coordination changes and substitutions (ca. 1~3 wt.% as oxide) of the absorber by dilute other atoms, at least under favorable conditions as those occurring in this system are. |
| 122 | 1997-11-26 | Dear, Finuda, Kloe: Kaonic Atoms, Hypernuclei and CP-Violation at the DAFNE F-Factory | 1997 | LNF-97-040(P).pdf | S. Bianco | Physics at DAFNE, the new Frascati e+e- machine, is reviewed, as well as the experiments: DEAR - search for KN exotic atoms, FINUDA - spectroscopy and decays of hypernuclei, and KLOE - a multipurpose detector designed for detecting direct CP violation. |
| 121 | 1997-11-12 | Total Hadronic Photoabsorption on Carbon and Lead in the Shadowing Threshold Region | 1997 | LNF-97-39.pdf | M. Mirazita, H.Avakian, N. Bianchi, A. Deppman, E. De Sanctis, V. Gyurjyan, V. Muccifora, E. Polli, P. Rossi, R. Burgwinkel, J. Hannappel, F. Klein D. Menze, W. Schwille, F. Wehnes | The total photoabsorption cross section for carbon and lead has been measured in the energy range 0.5 ÷ 2.6 GeV at Bonn using the SAPHIR tagged photon beam. Neclear data show a significant reduction of the absorption strength with respect to the free nucleon case suggesting a shadowing effect at low energies. |
| 4225 | 1997-11-10 | Susy Searches at LEP2 with the L3 Detector | 1997 | INFN-AE_97-56.pdf | G. Carlino | |
| 4278 | 1997-11-07 | Baryonic and Cold Dark Matter | 1997 | INFN-TH_97-10.pdf | V. Berezinsky | |
| 4279 | 1997-11-07 | Solar Neutrino as Highlight of Astroparticle Physics | 1997 | INFN-TH_97-11.pdf | V. Berezinsky | |
| 4267 | 1997-11-07 | The Earth's Magnetic Field Compensation in the Borexino Phototubes Facitiy | 1997 | INFN-TC_97-35.pdf | G. Bacchiocchi et al. | |
| 4224 | 1997-11-07 | The Observation of Up-Going Charged Particles Produced by High Energy Muons in Underground Detectors | 1997 | INFN-AE_97-55.pdf | The Macro Collaboration | |
| 4266 | 1997-10-31 | A Monocromatic X-Ray Source for a Pixe-Induced XRF Spectrometer | 1997 | INFN-TC_97-34.pdf | C. Cicardi, C. De Martinis, M. Milazzo, L. Robba | |
| 4265 | 1997-10-28 | Algorithms for Reduction of Coherent Noise in the Silicon Shower Maximum Detector of STIC | 1997 | INFN-TC_97-33.pdf | E. Falk, V. Hedberg, I. Gouz, G. Della Ricca | |
| 4264 | 1997-10-27 | Detector Array Control and Triggering | 1997 | INFN-TC_97-32.pdf | Chimera Collaboration | |
| 4230 | 1997-10-27 | A Study of the 90Zr(p,t)88Zr Reaction | 1997 | INFN-BE_97-5.pdf | P. Guazzoni, M. Jaskola, L. Zetta, J.N. Gu, A. Vitturi, G. Graw, R. Hertenberger, B. Valnion, F. Nuoffer, G. Staudt | |
| 4223 | 1997-10-24 | Measurement of mw at žs=172 GeV with a Direct Reconstruction Method Using the DELPHI Detector at LEP | 1997 | INFN-AE_97-54.pdf | M. Bigi, R. Chierici | |
| 4263 | 1997-10-13 | Quantum-Like Corrections and Semiclassical Description of Charged-Particle Beam Transport | 1997 | INFN-TC_97-31.pdf | R. Fedele, V.I. Maniko | |
| 4222 | 1997-10-10 | Wizard Collaboration - Papers Presented at the XXIV International Cosmic Ray Conference 30 July-6 August, Durban, South Africa | 1997 | INFN-AE_97-53.pdf | G. Barbiellini e al., (Wizard Coll.) | |
| 4221 | 1997-10-08 | Underground Neutron Spectrometry with a Liquid Scintillator Detector | 1997 | INFN-AE_97-52.pdf | F. Arneodo, F. Cavanna et al. | |
| 4276 | 1997-10-08 | Ultra-high Energy Cosmic Rays Without GZK Cutoff | 1997 | INFN-TH_97-8.pdf | V. Berenzisky, M. Kachelrieb, A. Vilenkin | |
| 4277 | 1997-10-08 | Ultra-High Energy LSP | 1997 | INFN-TH_97-9.pdf | V. Berezinsky, M. Kachelrieb | |
| 120 | 1997-10-06 | Algorithms for Correlation Analysis Between Gamma-Bursts and Gravitational Wave Data | 1997 | LNF-97-038(IR).pdf | G.Modestino, G.Pizzella | The problem of searching for possible correlation between the gamma bursts of still unknown origin and the data recorded with gravitational wave antennas is studied. The accuracy that can be obtained by averaging the gravitational wave data obtained in correspondence with gamma-bursts is evaluated. |
| 4262 | 1997-10-03 | TapeUtils - a Set Tools for Tapes Handling on Unix Version 1.0a | 1997 | INFN-TC_97-30.pdf | C. Strizzolo | |
| 117 | 1997-09-26 | CP Asymmetry in $K_d\;\ to \phi K_s$: Standard Model Pollution | 1997 | LNF-97-035(P).pdf | Y. Grossman, G. Isidori, M.P. Worah | The difference in the time dependent CP asymmetries between the modes $B \to \psi K0_s $ and $B \to \phi K_s $ is a clean signal for physics beyond the Standard Model. This interpretation could fail if there is a large enhancement of the matrix element of the $b \to u\barus$ operator between the $B_ d$ initial state and the $\phi K_s $ final state. We argue against this possibility and propose some experimental tests that could shed light on the situation. |
| 118 | 1997-09-26 | Can We Extract Short-Distance Information from B(KLÆ m+m-): ? | 1997 | LNF-97-036(P).pdf | G. D’Ambrosio, G. Isidori, J. Portoles | A new analysis of he long-distance two-photon dispersive amplitude of KLÆm+m- is presented. We introduce a phenomenological parametrization of the KÆg*g* form factor, constrained at low energies by KLÆ g+ml+l-(l=e,m) data and high energies by perturbative QCD. Using this form factor provide a reliable estimate of magnitude and relative uncertainty of the two-photon dispersive contribution in KLÆ m+m-. We finally discuss the implications of this analysis for the extraction of short-distance information from B(KLÆ m+m-). |
| 119 | 1997-09-26 | Corrections of Order L2QCD/m2c to Inclusive Rare B Decays | 1997 | LNF-97-037(P).pdf | G. Buchalla, G. Isidori, S.J. Rey | We calculate nonperturbative O(L2QCD/m2c) corrections to the dilepton invariant mass spectrum and the forward-backwarda charge asymmetry in BÆXse+e- decay using a heavy quark expansion approach. The method has recently been used to estimate long-distance effects in BÆXsg. We generalize this analysis to the case of non-vanishing photon invariant mass, q2€0, relevant for the rare decay mode BÆXse+e-. In the phenomenologically interesting q2 region away from the c`c resonances, the heavy quark expansion approach should provide a reasonable descrption of possible non-perturbative corrections. In particular this picture is preferable to the model-dependent approach relying on the tails of Breit-Wigner resonances, Which has been employed so far in the literature to account for these effects. We find that the O(L2QCD/m2c) corrections to the dilepton invariant mass spectrum and to the forward-backward asymmetry in BÆXse+e- amount to several percent at most for q2/m2b<~0.3 and q2/m2b>~0.6 respectively. The O(L2QCD/m2c) correction to the BÆXsg decay rate is also computed and found to be +3%, which agrees in magnitude with previous calculations. Finally, we comment on long-distance effects in BÆXsv`v, which in this case are extremely suppressed due to the absence of virtual photon contributions. |
| 4261 | 1997-09-26 | An External Electronic Feedback System Applied to a Cryogenic Micro-Calorimeter | 1997 | INFN-TC_97-29.pdf | M. Galeazzi | |
| 4259 | 1997-09-25 | Heat Dissipation in the 'Chimera' First Wheel Preamplifiers Setup | 1997 | INFN-TC-97-27.pdf | D. Nicotra, G. Saccá, N. Guardone, M. D'Andrea, F. Fichera | Calculations of the heat dissipation and measurements of the temperatures in a prototype of the first wheel electronics of the multidetector “CHIMERA” have been performed. The aim of these tests has been the optimization of the thermal coupling between the different electronic components of the setup. |
| 4260 | 1997-09-25 | Effetto della Degradazione del Cavo Superconduttore sul Solenoide FINUDA | 1997 | INFN-TC_97-28.pdf | P. Fabbricatore, R. Musenich | |
| 4220 | 1997-09-25 | Data Acquisition System for E-835 Silicon Detector | 1997 | INFN-AE_97-51.pdf | P. Musico, M. Pallavicini, S. Minutoli | |
| 116 | 1997-09-22 | Tetragonal-Strain-Induced Local Structural Modifications in InAsxP1-x/Inp Superlattices: a Detailed X-Ray-Absorption Investigation | 1997 | LNF-97-34.pdf | S. Pascarelli, F. Boscherini, C. Lamberti, S. Mobilio | We report a comprehensive investigation of the local structure around As in thin InAsxP1-x strined layers in InAsxP1-x/Inp superlattices by fluorescence-detected x-ray absorption fine structure; seven superlattice samples are studied as a function of composition, and compared to six unstrained, bulk samples of similar composition. Contributions up to the third coordination shell around As are clearly visible in the spectra, and are analyzed taking into account important multiple-scattering contributions. Results show that structural modifications due to tetragonal distortion appear mainly in the second and third coordination shells, while nearest-neighbor bond lengths remain closer to the values in unstrained bulk alloys. This implies that in semiconductor alloy tetragonal strain accomodation is mainly obtained through bond-angle distortions, in analogy to the situation in bulk pseudobinary alloys. A model which combines macroscopic elastic theory and the known local structure in bulk pseudobinary alloy is presented, and is found to fit the data very well. |
| 4219 | 1997-09-22 | Production and Transport of Hadrons Generated in Nuclear Cascades Initiated by `muons in the Rock (Exclusive Approach) | 1997 | INFN-AE_97-50.pdf | A. Dementyev, V. Gurenstov, O. Ryazhskaya, N. Sobolevsky | |
| 4258 | 1997-09-17 | Emission and Emittance Measurements of Electron Beam Generated from Cu and Diamond Photocathodes | 1997 | INFN-TC_97-26.pdf | V. Nassisi, A. Beloglazov, E. Giannico, M.R. Perrone, A. Raino | |
| 115 | 1997-09-16 | Status of the KLOE Experiment | 1997 | LNF-97-033(IR).pdf | The KLOE Collaboration | The present status of the KLOE Experiment is presented in this collection of recent KLOE notes. |
| 4271 | 1997-09-15 | High Energy Particle from Monipoles Connected by Strings | 1997 | INFN-TH_97-3.pdf | V. Berezinsky, X. Martin, A. Vilenkin | |
| 4272 | 1997-09-15 | Cosmic Necklaces and Ultrahigh Energy Cosmic Rays | 1997 | INFN-TH_97-4.pdf | V. Berezinsky, A. Vilenkin | |
| 4218 | 1997-09-15 | Study of solar Neutrino Detection in the 600 Ton Liquid Argon ICARUS Time Projection Chamber | 1997 | INFN-AE_97-49.pdf | R. Dolfini, M. Maris, C. Montanari, A. Rappoldi, C. Vignoli, A. Borio di Tiglione, A. Cesana, M. Terrani, F. Cavanna, G. Nurzia, F. Pietropaolo | |
| 4273 | 1997-09-15 | Gravitational Violation of R. Parity and its Cosmological Signatures | 1997 | INFN-TH_97-5.pdf | V. Berezinsky, Anjan S. Joshipura, J.W.F. Valle | |
| 4274 | 1997-09-15 | 50 TeV HEGRA Sources and Infrared Radiation | 1997 | INFN-TH_97-6.pdf | V. Berezinsky, L. Bergstrom, H.R. Rubistiein | |
| 4275 | 1997-09-15 | Heliosismic Contraints to the Central Solar Temperature and Neutrino Fluxes | 1997 | INFN-TH_97-7.pdf | B. Ricci, V.Berezinsky, S. Degl'Innocenti, W.A. Dziembowski, G. Fiorentini | |
| 4256 | 1997-09-08 | IPaccountng: Monitoraggio e Produzione di Statistiche di Traffico TCP/IP su Router Cisco per Piattaforme UNIX - Versione 2.0 | 1997 | INFN-TC_97-24.pdf | R. Gomezel, C. Strizzolo | |
| 4257 | 1997-09-08 | Simulating Intrinsically AC-Coupled Hybryd Pirex Detectors | 1997 | INFN-TC_97-25.pdf | V. Bonvicini, M. Pindo | |
| 4254 | 1997-09-04 | A Possible Borexino Trigger System | 1997 | INFN-TC_97-22.pdf | P. Musico, A. Nostro | |
| 4255 | 1997-09-04 | A Possible Data Acquisition System for the Borexino Experiment | 1997 | INFN-TC_97-23.pdf | P. Musico, A. Nostro, M. Ruscitti | |
| 113 | 1997-09-02 | Hidden and Open Beauty in CUSB | 1997 | LNF-97-031(P).pdf | J. Lee Franzini | We present a brief history and summary of the physics results of CUSB at CESR. |
| 114 | 1997-09-02 | CP Violation in the K-System | 1997 | LNF-97-32(P).pdf | J. Lee Franzini, P. Franzini | CP violation in the K system is pedagogically reviewed. We discuss its manifestations in the neutral K meson systems, in rare K meson decays and in decays of charged K mesons. Results from classical experiments, and perspectives for upcoming experiments are included. We also briefly discuss the possibility of CPT tests. |
| 4252 | 1997-09-01 | A Positive Readout Card for RPC Detector | 1997 | INFN-TC_97-20.pdf | A. Anastasio, N. Cavallo, F. Fabozzi, P. Masone, P. Paolucci, L. Parascadalo, P. Parascadalo, D. Piccolo | |
| 4253 | 1997-09-01 | A Transient Voltage Protection Network for ECL Data Transmission | 1997 | INFN-TC_97-21.pdf | V. Masone, L. Parascandalo, P. Prascandolo | |
| 4217 | 1997-07-25 | A Bhabha Generator for DAFNE Including Radiative Corrections and f Resonance | 1997 | INFN-AE_97-48.pdf | E. Drago, G. Venanzoni | |
| 111 | 1997-07-23 | Construction Techniques of the High Resolution Lead/Scintillating Fibre Electromagnetic Calorimeter for the KLOE Experiment | 1997 | LNF-97-29(NT).pdf | M. Anelli, G. Bisogni, A. Ceccareli, A. De Paolis, A. Di Virgilio, G. Ferretti, E. Iacuessa, L. Iannotti, H.T. Li, U. Martini, A. Olivieri, A. Rutili, S. Valeri, C.S. Yang, Y. Yang, S. Tolaini, F. Basti, M. Bertino, A. Iacoangeli, C. Piscitelli, M. Siteni | The electromagnetic calorimeter of the KLOE experiment at the DAFNE j-factory is a lead-scintillating fibre sampling device. This calorimeter is arranged as a “barrel”, closed at both ends with an “end-cap” consists in 24 modules defining a cylinder, 4,3 long, with 4 m inner diameter. Each end-caps consists of 32 modules running vertically along the chords of the circle inscribed into the barrel. In this paper the calorimeter construction techniques are described. |
| 112 | 1997-07-23 | The GRAAL High Resolution BGO Calorimeter and its Energy Calibration and Monitoring System | 1997 | LNF-97-030(P).pdf | F. Ghio, B. Girolami, M. Capogni, L. Casano, L. Ciciani, A. D’Angelo, R. Di Salvo, L. Hu, D. Moricciani, L. Nicoletti, G. Nobili, C. Schaerf, P. Levi Sandri, M. Castoldi, A. Zucchiatti, V. Bellini | We describe the electromagnetic calorimeter built for the GRAAL apparatus, at the ESRF. Its monitoring system is presented in detail. Results from tests and the performance obtained during the first GRAAL experiments are given. The energy calibration accuracy and stability reached is a small fraction of the intrinsic detector resolution. |
| 4214 | 1997-07-23 | DPMJET Version II.3 and II.4 | 1997 | INFN-AE_97-45.pdf | J. Ranft | |
| 4215 | 1997-07-23 | Study of the Primary Cosmic Ray Composition in the Knee region with EAS–TOP and Macro | 1997 | INFN-AE_97-46.pdf | MACRO and EAS–TOP Coll. XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4216 | 1997-07-23 | Experimental Study of Hadronic Interaction Models Using Coincident Data From EAS-TOP and Macro | 1997 | INFN-AE_97-47.pdf | MACRO and EAS–TOP Coll. XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 110 | 1997-07-21 | Nonlinear Realizations of Superconformal and W Algebras Embeddings of Strings | 1997 | LNF-97-028(P).pdf | S. Bellucci, V. Gribanov, E. Ivanov, S. Krivonos A. Pashnev | We propose a simple method for constructing representations od (super) conformal and nonlinear W-type algebras in terms of their subalgebras and coresponding Nambu–Goldstone fields. We apply it to N=2 and N=1 superconformal algebras and describe in this subalgebras define world-sheet symmetries. Besides reproducing the known exmples, we present some new ones, in particular an embedding of the bosonic string with additionsl U(1) affine symmetry into N=2 superstring. We also apply our method to the nonlinear W(2)3 algebra and demonstrate that the linearization procedure worked out for it some time ago gets a natural interpretation as kind of string embedding. All these embeddingd include the critial ones as particular cases. |
| 109 | 1997-07-16 | Photon-Photon Total Inelastic cross-section | 1997 | LNF-97-027(P).pdf | A. Corsetti, R.M. Godbole, G. Pancheri | We discuss predictions for the total inelastic gg cross-section and their model dependence on the input parameters. We compare results from a simple extensione of the Regge Pomeron exanche model aswell as predictions from the eikonalized mini-jet model with recent LEP data. |
| 108 | 1997-07-15 | On the Absence of Multiple Dips in Diffraction of Hih Energy Hadrons | 1997 | LNF-97-026(P).pdf | A. Malecki, M. Michalec, M. Pallotta | An unorthodox insight into the structure of the geometrical Chou-Yang model explains the experimentally observed paradox of elastic diffraction of high energy hadrons without multiple dips. It is pointed out that the shadow scattering, away from the forward peak, is governed by small values of the coupling strength. |
| 107 | 1997-07-14 | A Search for Axial Vectors in antip p Æ K± K0miss p±p+p- Annihilations at Rest in Gaseous Hydrogen at NTP | 1997 | LNF-97-25.pdf | A. Bertin, M. Bruschi, M. Capponi, A. Collamati, S. De Castro, R. Donà, A. Ferretti, D. Galli, B. Giacobbe, U. Marconi, M. Piccinini, N. Semprini-Cesari, R. Spighi, S. Vecchi, A Vezzani, F. Vigotti, M. Villa, A. Vitale, A. Zoccoli, M. Corradini, A. Donzella, E. Lodi Rizzini, L. Venturelli, A. Zenoni, C.Cicalò, A. Lai, A. Masoni, L. Musa, G. Puddu, S. Serci, P.P. Temnikov, G. Usai, O.E. Gorchakov, S.N. Prakhov, A.M. Rozhdestvensky, M.G. Sapozhnikov, V.I. Tretyak, M. Poli, P. Gianotti, C. Guaraldo, A. Lanaro, V. Lucherini, F. Nichitiu, C. Petrascu, A. Rosca, V. Ableev, C. Cavion, U. Gastaldi, M. Lombardi, G. Maron, L. Vannucci, G. Vedovato, G. Bendiscioli, V. Filippini, A. Fontana, P. Montagna, A. Rotondi, A. Saino, P. Salvini, C. Scoglio, F. Balestra, E. Botta, T. Bressani, M.P. Bussa, L. Busso, D. Calvo, P. Cerello, S. Costa, O. Denisov, L. Fava, A. Feliciello, L. Ferrero, A. Filippi, R. Garfagnini, A. Grasso, A. Maggiora, S. Marcello, D. Panzieri, D. Parena, E. Rossetto, F. Tosello, L. Valacca, M. Agnello, F. Iazzi, B. Minetti, G. Pauli, S. Tessaro, L. Santi | The study of the K± K0miss p±p+p- Channel (7016 events), from `p p annihilations in a gaseous hydrogen target at NTP, with the OBELIX spectrometer at LEAR (CERN), is presented. A spin-parity analysis provides evidence for two axial vectors, one in low K `K p mass region, the well established f1 (1285), decaying to a0(980)p, the second, the 1++ component of the old puzzling E/i, the f1 (1420), decaying mainly to K* antiK, seen for the first time in `p p annihilation at rest. The analysis confirms the dominant production of the pseudoscalar h(1405), decaying mainly to (Kp)s`K, and the existence of a second pseudoscalar in the same mass region, the h(1460), decaying mainly to K* `K. |
| 106 | 1997-07-03 | Al Coordination and Local Structure in Minerals: XAFS Determinations and Multiple-Scattering Calculations for K-Feldspars | 1997 | LNF-97-24.pdf | Z. Wu, A. Marcelli, A. Mottana, G. Giuli, E. Paris | The Al K-edge spectra of three potassium feldspars KAlSi3O8: sanidine, microcline and orthoclase, all with four-fold-coordinated Al, have been measured by X-ray absorption near-edge structure spectroscopy and calculated according to the multiple-scattering formalism using clusters of different sizes and the Xa exchange-correlaition potential. Although these structures are quite complex, and clusters as large as containing ca. 150 atoms are needed to calculate them, a significant agreement has been obtained between experimental spectra and calculated ones up to 60 eV above the threshold, both for energy positions and for relative intensities. Moreover, while the gross features of all spectra appear to be dominated mainly by the first coordination sphere around the absorber, effects due to higher shells are detected. |
| 4200 | 1997-07-02 | The High Energy Muon Spectrum in Extensive Air Showers: First Data from LVD and EAS-TOP at Gran Sasso | 1997 | INFN-AE_97-31.pdf | M. Aglietta et al. LVD and Eas TOP Coll. the XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4201 | 1997-07-02 | Large TeV and TeV Muon Multiplicities in eas: Separation of P and very Heavy Promaries at 1015 eV | 1997 | INFN-AE_97-32.pdf | M. Aglietta et al. LVD and EAS TOP Coll. the XXV I CRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4202 | 1997-07-02 | Study of Neutrinos from Stellar Collapses with the LVD Experiment in the Gran Sasso Laboratory | 1997 | INFN-AE_97-33.pdf | LVD Collaboration LVD Coll. the XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4203 | 1997-07-02 | An Energy Signature fir Very Deep Underground Muons Observed by the LVD Experiment | 1997 | INFN-AE_97-34.pdf | LVD Collaboration LVD Coll. the XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4204 | 1997-07-02 | Upper Limit on the Prompt Muon Flux Derived from LVD Data | 1997 | INFN-AE_97-35.pdf | LVD Collaboration LVD Coll. the XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4205 | 1997-07-02 | Study of muon EnergyLosses in the LVD Experiment | 1997 | INFN-AE_97-36.pdf | LVD Collaboration LVD Coll. the XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4206 | 1997-07-02 | Search for Point Sources with Muons Observed by LVD | 1997 | INFN-AE_97-37.pdf | LVD Collaboration LVD Coll. the XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4207 | 1997-07-02 | Study of the Proton–Air Inelastic Crss Section at žs=1.6–2.4 TeV from EAS–TOP | 1997 | INFN-AE_97-38.pdf | EAS-TOP Collaboration XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4208 | 1997-07-02 | The Hadron Spectrum at 840 gcm–2 Average Atmospheric Dedth | 1997 | INFN-AE_97-39.pdf | EAS-TOP Collaboration XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4209 | 1997-07-02 | Primary Composition Analysis from Muons in EAS | 1997 | INFN-AE_97-40.pdf | EAS-TOP Collaboration the the XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4210 | 1997-07-02 | Study of the eas Cores in the Knee Region | 1997 | INFN-AE_97-41.pdf | EAS-TOP Collaboration XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4211 | 1997-07-02 | Study of the Knee of the cosmic Ray Spectrum in the Electron Component | 1997 | INFN-AE_97-42.pdf | EAS-TOP Collaboration XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4212 | 1997-07-02 | Search for 30–50 TeV g Rays from Markarian 421 | 1997 | INFN-AE_97-43.pdf | EAS-TOP Collaboration XXV ICRC, Durban, South Africa, July 28-Aug 10 1997 | |
| 4213 | 1997-07-02 | Real Time Supernova Neutrino Burst Detection with MACRO | 1997 | INFN-AE_97-44.pdf | M. D'Ambrosio et al. MACRO Collaboration | |
| 4251 | 1997-07-01 | Electronics Design of the Front-End for the RPC Muon Detector at BABAR | 1997 | INFN-TC_97-19.pdf | N. Cavallo, F. Fabozzi, P. Paolucci, L. Parascandolo, D. Piccolo | |
| 4199 | 1997-07-01 | The Muon and KL Detector for the BABAR Experiment: Physics Requirements, Final Design and Start of Construction | 1997 | INFN-AE_97-30.pdf | F.Anulli, A. Asmone, R. Baldini Ferroli, R.M. Bionta, A. Buzzo, A. Calcaterra, G.P. Carlino, N. Cavallo, R. Contri, G. Crosetti, R. de Sangro, F. Fozzi, D. Falciai, T. Franchi, J.R. Johnson, L. Lista, M. Lo Vetere, M. Macrì, S. Mele, R. Monge, A. Palano, M. Pallavicini, P. Paolucci, P. Parascandolo, C. Patrignani, I. Peruzzi, M.G. Pia, D. Piccolo, M. Piccolo, E. Robutti, A. Santroni, C. Sciacca, K. Van Bibber, T.J. Wenaus, D.M. Wright, A. Zallo | |
| 101 | 1997-06-30 | Impedance of a Coaxial Cavity Coupled to the Beam Pipe Through a Small Hole | 1997 | LNF-97-020.pdf | S. De Santis, L. Palumbo | In this paper we derive the impedance of a coaxial-line resonator coupled to the beam pipe through a small hole. The method used takes into account the scattered fields on the aperture to calculate its electric and magnetic dipole moments. The low-frequency impedance shows a resistive contribution accounting for the cavity loss. |
| 4250 | 1997-06-30 | Electrical Characterizations of the Superconducting BABAR Solenoid Condictors | 1997 | INFN-TC_97-18.pdf | P. Fabbricatore, R. Musenich, C. Priano | |
| 104 | 1997-06-27 | Residual Stress in Polycrystalline Diamomd/Ti-6A1-4V Systems | 1997 | LNF-97-023.pdf | P. Scardi, M. Leoni, G. Cappuccio, V. Sessa, M.L. Terranova | |
| 4249 | 1997-06-27 | Manuale di Installazione e Utilizzo del Programma ARC per la Cella AFS INFN.IT | 1997 | INFN-TC_97-17.pdf | R. Gomezel, A. Maslennikov | |
| 4198 | 1997-06-27 | Experimental Measurements of the Antimatter Component in Cosmic Rays | 1997 | INFN-AE_97-29.pdf | G. Barbiellini, M. Zalateu | |
| 103 | 1997-06-24 | Interference Effects on the Coupling Impedance of Many Holes in a Coaxial Beam Pipe | 1997 | LNF-97-022(IR).pdf | S. De Santis, A. Mostacci, L. Palumbo, B. Spataro | The problem of many holes in a coaxial beam pipe is studied by means of the modified Bethe’s theory. The electromagnetic fields propagating in the coaxial region couple to the equivalent dipole moments of the holes. The effect of the coupling on the longitudinal impedance and on the loss factor is investigated, showing that the interference phenomena are significant for such geometries. |
| 4188 | 1997-06-19 | Magnetic Monopole Search with the MACRO Detector at Gran Sasso | 1997 | INFN-AE_97-19.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 4191 | 1997-06-19 | Neutrino astronomy with the MACRO Detector | 1997 | INFN-AE_97-22.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 4192 | 1997-06-19 | Indirect Search for Wimps with the MACRO Detector | 1997 | INFN-AE_97-23.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 4193 | 1997-06-19 | Observation of Upgoing Charged Particles in MACRO Produced by High Energy Interactions of Muons | 1997 | INFN-AE_97-24.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 4194 | 1997-06-19 | An Improved Analysis of the Underground Muon Decoherence Observed in MACRO | 1997 | INFN-AE_97-25.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 4195 | 1997-06-19 | Measurement of Underground Muon Energies Using a TRD in MACRO | 1997 | INFN-AE_97-26.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 4196 | 1997-06-19 | A Sky Survey Using Muons in the MACRO Detector | 1997 | INFN-AE_97-27.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 4197 | 1997-06-19 | The Search for a Sideral Anisotropy in the Underground Muon Intensity as Seen by MACRO | 1997 | INFN-AE_97-28.pdf | Contributions of the MACRO Collaboration to the 1997 Summer Conferences | |
| 102 | 1997-06-17 | LNF Spring School in Nuclear and Subnuclear Physics & V EURODAFNE Collaboration Meeting – (Frascati, APRIL 14-18, 1997) | 1997 | LNF-97-021(IR).pdf | AA. VV. | |
| 4248 | 1997-06-16 | MACRO On–Line Controls of the Web MACRO Bologna Home Page | 1997 | INFN-TC_97-16.pdf | P. Gallicola, R. Giacomelli, G. Mandrioli, A. Margiotta | |
| 4187 | 1997-06-16 | Computed Age of Cosmic Ray Protons in the Local Zone of the Galactic Disk and its Dependence on the Magnetic Field | 1997 | INFN-AE_97-18.pdf | M.T. Brunetti A. Codino | |
| 4186 | 1997-06-05 | W Production and mw Measurement Using the DELPHI Detector at LEP | 1997 | INFN-AE_97-17.pdf | R. Chierici | |
| 100 | 1997-05-30 | Electronic Strucure and Final–State Effects in Nd2CuO4, La2CuO4, and Ca2CuO3 Compounds by Multiple–Scattering Theory at the Copper K Edge | 1997 | LNF-97-19.pdf | Ziyu Wu, M. Benfatto, C.R. Natoli | We present a theoretical analysis, based on the zeroth-order approximation of the multichannel multiple-scattering theory, of the x-ray-absorption spectra of Nd2CuO4, La2CuO4, and Ca2CuO3 compounds at the copper K edge. Single channel theoretical calculations have been made using atomic clusters large enough to be sure that all one-electron features have been correctly described. On this basis the presence of both 3d9 and 3d10L_ configurations in the ground state has been found essential to obtain good agreement between experimental data and theoretical calculations in the case of Nd2CuO4 and Ca2CuO3. Conversely, the best agreement with the La2CuO4 data has been obtained by taking into account only the 3d10L_ configuration in the final state. We briefly comment on this finding. |
| 4247 | 1997-05-29 | Experiment for Ligh Flash Observation in Space (ELFO) | 1997 | INFN-TC_97-15.pdf | M. Casolino, M. De Pascale, A. Morselli, L. Narici, P. Picozza, V. Prigiobbe, R. Sparvoli, O. Adriani, P. Spillantini, G. Castellini, S. Bartalucci, C. Catena, D. Conti, M. Ricci, E. Righi, B. Spataro, G. Trenta, M. Durante, G. Gialanella, G. Grossi, M. Pugliese, G. Barbiellini, M. Boezio, A. Vacchi, N. Zampa, W.G. Sannita, L. Lopez, M. Peresson, S. Conforto, I. Bodis-Wollner, C. Basar-Eroglu, A.P. Burlina, P. Renzi, C. Tanzarella, G. Alberigi, L. Casoli, S. Cerdonio, A. Lenti, A. Galper, Yu. Ozerov, A. Popov, V. Zemskov, V. Zverev, A. Alexandrov, S. Avdeev, V. Shabelnikov | |
| 99 | 1997-05-23 | Experimental Investigations on Geometrical Resolution of Optical Transition Radiation (OTR) | 1997 | LNF-97-18(P).pdf | X. Artru, M. Castellano, L. Catani, R. Chehab, D. Giove, K. Honkavaara, P. Patteri, M. Taurigna–Quere, A. Variola, L. Wartski | Optical Transition Radiation (OTR) provides an attractive mothod for diagnostics on electron/positron beams of small dimensions at high energies (GeV). However, some limits on the geometrical resolution at very high energies have been often discussed in the literature and a minimum value given by ‘gl’ has been invoked. In order to bring an experimental contribution to the problem, systematic measurements of electron beam profiles, in the energy range of 1-2 GeV and at optical wavelength between 400 and 700 nm, have been carried out at the Orsay 2 GeV Linear Accelerator. OTR emitted from an alluminium foil at a 30° incidence angle was collected by a two-lens telescope and recorded by an intensified CCD camera. The OTR beam profiles were compared to the profiles obtained by a SEM Grid having a resolution better than 0. mm. After a theoretical introduction presenting the different resolution limits, which can be invoked with diffraction phenomenon, and a presentation of our calibration procedure, the experimental results are presented and compared to these limits. They show that the resolution OTR measurements is definitely better than the already invoked gl -limit. For a small size electron beam an rms beam width as small as 170 mm, comapred to gl = 2.5mm (E=2 GeV and l = 650 nm), has been measured. Our theoretical analysis also provides a more precise evaluation of the resolution power of OTR, which depends on the sensitivity of the detector; this could be of interest for much higher energies. |
| 4246 | 1997-05-07 | Tecniche di Spettroscopia Elettronica per l'Analisi di Superfici | 1997 | INFN-TC_97-14.pdf | A. Daccà, G. Gemme, R. Parodi | |
| 4185 | 1997-05-07 | Magnetic Monopole Search with the MACRO Detector at Gran Sasso | 1997 | INFN-AE_97-16.pdf | The MACRO Collaboration | |
| 4232 | 1997-05-07 | Temperature Influence on the Oxidation of Niobium for Superconducting RF Cavities | 1997 | INFN-FM_97-2.pdf | A. Daccà, G. Gemme, R. Parodi | |
| 4231 | 1997-05-02 | Some Information about the Four Experimental Sectors of Physics in which Superluminal Motions Seem to Appear | 1997 | INFN-FM_97-1.pdf | E. Recami | |
| 4184 | 1997-05-02 | Hydrodynamical Reformulation and Quantum Limit of the Barut-Zanghi Theory | 1997 | INFN-AE_97-15.pdf | E. Recami | |
| 4244 | 1997-04-28 | Enexpected Elements from Saturated Palladium Hybrides | 1997 | INFN-TC_97-12.pdf | V. Nassisi | |
| 4245 | 1997-04-28 | Measurements of Ca, O and C Concentrations in Bone Tissues Processed by Laser Irradiation | 1997 | INFN-TC_97-13.pdf | V. Nassisi | |
| 4270 | 1997-04-21 | Entropy Production in the Early Universe - a New Mechanism | 1997 | INFN-TH_97-2.pdf | P. Di Bari | |
| 4243 | 1997-04-16 | An Envelope Treatment of Space Charge Dominated Proton Beams in RF Linacs | 1997 | INFN-TC_97-11.pdf | L. Serafini, J.B. Rosenzweig | |
| 4183 | 1997-04-10 | LibVME - User's Guide ver.1997 | 1997 | INFN-AE_97-14.pdf | A. Raimondo | |
| 4228 | 1997-04-10 | The Proton and Deuteron Polarized Target for CLAS: Preliminary Results at the University of Genoa | 1997 | INFN-BE_97-3.pdf | M. Anghinolfi, P. Cocconi, D.G. Crabb, R. De Vita, F. Parodi | |
| 4269 | 1997-04-07 | Non Standard Electroweak Contributions to the Muon g-2 from Anomalous Gauge Boson Couplings | 1997 | INFN-TH_97-1.pdf | S. Spagnolo | |
| 4182 | 1997-04-07 | Systematic Study of the Features of the Streamer Discharge by Means of Pulse Shape Analysis | 1997 | INFN-AE_97-13.pdf | G. Battistoni, A. Candela, I. De Mitri, U. Denni, A. Frani, F. Guarino, L. Nicoletti, V. Patera, A. Sciubba | |
| 98 | 1997-03-28 | Proton Electromagnetic Time-Like form Factors Updated at Threshold | 1997 | LNF-97-017(IR).pdf | B.L.Druzhinin, A.E. Kudryavtsev, E. Pascqualucci | A revised expression for the electromagnetic form factor of the proton in time-like region (p2>0) near threshold is given. Recent data on p antip annihilation cross section as well as the well-known p `p-branching into e+e--pairs from atomic states are used to extract the value of form factor at threshold (s=q2=4m2p). At this point |Gp(4m2p)|=0.41+0.02-0.08. |
| 97 | 1997-03-27 | Effective Gravity and OSp(N,4) Invariant Matter | 1997 | LNF-97-16(P).pdf | S. Bellucci | We re-examine the OSp(N, 4) invariant interacting model of massless chiral and gauge superfields, whose superconformal invariance was instrumental, both in proving the all-order no-renormalization of the mass and chiral self-interaction lagrangians, and in determining the linear superfield renormalization needed. We show that the renormalization of the gravitational action modifies only the cosmological term, without affecting higher-order tensors. This could explain why the effect of the cosmological constant is shadowed by the effects of newtonian gravity. |
| 93 | 1997-03-25 | Gravity Quantized (the High Tension String) | 1997 | LNF-97-12(P).pdf | S. Bellucci, S. Shiekh | A candidate theory of gravity quantized is reviewed. |
| 94 | 1997-03-25 | Frequency Dependence of Susceptibility Higher Harmonics in YBCO Samples by Numerical Solutions of the Non Linear Magnetic Flux Diffusion Equation | 1997 | LNF-97-013(R).pdf | D. Di Gioacchino, P. Tripodi, F. Celani, A.M. Testa, S. Pace | We present a numerical analysis of the diffusion equation of the magnetic flux in YBCO in presence of ac magnetic fields taking into account flux creep and flux flow. Despite critical state models, the results show the dependence of harmonic susceptibilities on the field frequency in agreement with the experimental behavior. |
| 95 | 1997-03-25 | Top Mesons | 1997 | LNF-97-14(P).pdf | N. Fabiano | The possibility of formation for a bound state of a t quark and a lighter one is investigated using potential model predictions and heavy quark effective theory approach. Resulting estimates for 1S-2S splitting of the energy levels are compared to the total top decay width Gt. As for the case of toponium, our conclusions show that the probability of formation for T-mesons is negligibly small due to the high top mass value. |
| 96 | 1997-03-25 | Frequency Dependence of the Higher Harmonics Susceptibilities of Hydrogen Loaded and Unloaded Melted YBCO Samples | 1997 | LNF-97-015(R).pdf | P. Tripodi, D. Di Gioacchino, F. Celani, A. Spallone, D. Shi | We measured the first and higher components of ac susceptibilities of melted YBCO samples before and after hydrogenation by ms pulsed electrolysis. First component was measured versus temperature at fixed frequency while higher harmonics were measured versus frequencies at fixed temperature near critical temperature. All measurements were performed at fixed amplitude of ac magnetic field and zero dc magnetic field. The frequency and temperature behavior of the harmonic components before and after hydrogenation gave us information on possible dynamic losses in comparison to the flux pinning mechanism. |
| 4242 | 1997-03-25 | Applicazioni Scientifiche ed Industriali di Acceleratori di Elettroni e Ioni: Proposta per la Realizzazione di un Centro Interdisciplinare di Irraggiamento a Torino | 1997 | INFN-TC_97-10.pdf | A. Staiano | |
| 4241 | 1997-03-21 | Design of a High Throughput Fifo Board | 1997 | INFN-TC_97-9.pdf | F. Fabozzi, P. Parascadolo | |
| 4180 | 1997-03-18 | Role of the Electromagnetic Processes in the High-Energy Muon Production | 1997 | INFN-AE_97-11.pdf | V.A. Kudryavtsev, D.G. Ryazhskaya | |
| 4181 | 1997-03-18 | A Three-Dimensional Code for Muon Propagation Through the Rock: MUSIC | 1997 | INFN-AE_97-12.pdf | P. Antonioli, C. Getti, E.V. Korolkova, V.A. Kudryavtsev, G. Sartorelli | |
| 4240 | 1997-03-18 | Beam Test of the Timing Properties of 2m Long Bars of BC408 Plastic Scintillator | 1997 | INFN-TC_97-8.pdf | R. Perrino | |
| 4227 | 1997-03-06 | The Study of Beta Envirovmental Fine Structure Appled to be the b-Delay of 187Re | 1997 | INFN-BE_97-2.pdf | A. Swift | |
| 4237 | 1997-03-06 | Misure della Lunghezza di Attenuazione Efficace in Barre di Scintillatore Plastico BC408 | 1997 | INFN-TC_97-5.pdf | R. Perrino, E. Cisbani, R. De Leo, S. Frullani, F. Garibaldi, M. Iodice, L. Lagamba, A. Leone, G.M. Urciuoli | |
| 4238 | 1997-03-06 | Design of an High Speed Clock Distribution Network | 1997 | INFN-TC_97-6.pdf | P. Parascandolo, F. Fabozzi | |
| 89 | 1997-02-25 | New Kinds of Electrolytic Regimes and Geometrical Configurations to Obtain Anomalous Results in Pd(M)-D Systems | 1997 | LNF-97-008(P).pdf | F. Celani, A. Spallone, P. Tripodi, D. Di Gioacchino, P. Marini, V. Di Stefano, A Mancini, S. Pace | Electrolyses of long and thin Pd (and PdY alloy) wires, in dilute solutions of LiOD-D2O and LiOH-H2O at large operating voltages, were made. An innovative kind of geometrical set-up to improve the efficiency of electromigration effect in proton conductors was developed: the usual 'single-ended' geometry at the most cathodic point of the wire changed to the 'central wire' geometry. The detected excess heat seems to be related to: (H/D) isotopic effect, lattice characteristics, geometrical set-up, dynamic variation of concentration inside Pd wire, anode-cathode and inter-cathodic voltages. |
| 90 | 1997-02-25 | Observations of Strong Resistivity Reduction in a Palladium Thin Long Wire Using Ultra-High Frequency Pulsed Electrolysis at D/Pd>1 | 1997 | LNF-97-9(P).pdf | F. Celani, A. Spallone, P. Tripodi, D. Di Gioacchino | We performed a ultra-short width high voltage pulse electrolysis using a thin Pd wire cathode; a diluted electrolytic solution of D2O+LiOD was used in a peculiar wire-turned electrodes geometry. The deuterated Pd loading was evaluated by the D/Pd normalised electric resistance curve (R/Ro). After a long time of eletrolysis a very high D/Pd loading (1:1 or more) was reached. Very low R/Ro (<0.1) Pd wire was measured after switching off the electrolysis and this effect lasted for several minutes. The Deuterium deloading occurred in several typologies (fast and slow terms) showed as a resistance transition on the Pd wire. This effect can be related to a peculiar surface structural condition. |
| 91 | 1997-02-25 | Functional SAXS Study of Haemocyanin Dioxygen-Carrier Protein | 1997 | LNF-97-10.pdf | M. Beltramini, E. Borghi, P. Di Muro, A. La Monaca, B. Salvato, C. Santini | The effects of conformational rearrangements on dioxygen binding to molluscan haemocyanins have been investigateted by small-angle X-ray scattering (SAXS). The SAXS patterns of the oxygenated and deoxygenated two forms of Octopus vulgaris haemocyanin are significantly different; whereas the patterns of the two forms of Rapana thomasiana haemocyanin are almost superimposable. A program has been developed, based on the differences in molecular dimensions, in order to simulate the effects observed in the investigaion. |
| 92 | 1997-02-25 | The Use of Small-Angle X-Ray Scattering in the Study of Quaternary Organization of Giant Proteins | 1997 | LNF-97-11.pdf | M. Beltramini, E. Borghi, P. Di Muro, A. La Monaca, B. Salvato, C. Santini | We report a investigation on the quaternary organisation of hemocyanin giant proteins, performed with continuous small-angle X-ray scattering (SAXS) at the LURE facility. The molecular weight of a 11S subunit of molluscan hemocyanin was determined from the experimental data. Structural models of this subnit, which include seven or five functional units, were also derived and correlated to the whole molecule, which has the form of a hollow cylinder. |
| 4239 | 1997-02-25 | Thermal and Electrical Behaviour of a Resistive Junction in the ATLAS Toroids | 1997 | INFN-TC_97-7.pdf | E. Acerbi, G. Ambrosio, M. Sorbi, G. Volpini | |
| 88 | 1997-02-21 | D* Production from e+e- to ep Collisions in NLO QCD | 1997 | LNF-97-7(P).pdf | M. Cacciari, M. Greco | Fragmentation finctions for D mesons, based on the convolution of a perturbative part, related to the heavy quark perturbative showering, and a non-perturbative model for its hadronization into the meson, are used to describe D* production in e+e- and ep collisions. The non-perturbative part is determined by fitting the e+e- data taken by ARGUS and OPAL at 10.6 and 91.2 GeV respectively. When fitting with a non perturbative Peterson fragmentation function and using next-to-leading evolution for the perturbative part, we find an Πparameter significantly different from the one commonly used, wich is instead found with a leading order fit. The use of this new value is shown to increase considerably the cross section D* production at HERA, suggesting a possible reconciliation between the next-to-leading order theoretical predictions and the experimental data. |
| 4179 | 1997-02-21 | Simulation of Muon Transport at High Energy: Comparison of Few Different Codes | 1997 | INFN-AE_97-10.pdf | G. Battistoni, C. Forti, A. Ferrari, E. Scapparone | |
| 4178 | 1997-02-18 | Experimental Beam test of the Si-Eye2 Apparatus | 1997 | INFN-AE_97-9.pdf | V. Bidoli, M. Casolino, M.De Pascale, G. Furano, S. Giuntoli, A. Morselli, P. Picozza, E. Reali, R. Sparvoli, A. Galper, Yu. Ozerof, A. Popov, V. Zemskov, V. Zverev, A. Alexandrov, S. Avdeev, V. Shsbelnikov, M. Boezio, P. Carson, C. Fuglesang, G. Barbiellini, W. Bonvicini, A. Vacchi, N. Zampa, G. Mazzenga, M. Ricci, P. Spillantini | |
| 4226 | 1997-02-13 | Electron Induced Hexadecapole Excitations in Neodymium Isotopes | 1997 | INFN-BE_97-1.pdf | R. Perrino | |
| 4177 | 1997-02-13 | Muon Pair by Muons and Narrow Muon Bundles Underground | 1997 | INFN-AE_97-8.pdf | V.A. Kudryavtsev, O.G. Ryazhskaya | |
| 4176 | 1997-02-07 | A Theoretical Review of the B Æ D(*) –D(*) Decay Channel | 1997 | INFN-AE_97-7.pdf | G. Michelon | |
| 85 | 1997-02-05 | First Test of Cronos, the NESTOR Slow Controls System | 1997 | LNF-97-004(IR).pdf | P. Locchi, A. Marini, L. Trasatti | A prototype of the NESTOR[1,2] Slow Controls System, CRONOS (Controls for Realtime Observations of Nestor and Oceanographic Studies) was assembled and tested in the Titanium sphere of two floors. The system was used to measure the temperature distribution inside the closed spheres. |
| 86 | 1997-02-05 | The Gravitational Wave Detector NAUTILUS Operating at T=0.1 K | 1997 | LNF-97-005(P).pdf | P. Astone, M. Bassan, P. Bonifazi, P. Carelli, E. Coccia, C. Cosmelli, V. Fafone, S. Frasca, A. Marini, G. Mazzitelli, Y. Minenkov, I. Modena, G. Modestino, A. Moleti, G. V. Pallottino, M. A. Papa, G. Pizzella, P. Rapagnani, F. Ricci, F. Ronga, R. Terenzi, M. Visco, L. Votano | We report on the ultralow–temperature resonant–mass gravitational–wave detector NAUTILUS, operating at the Frascati INFN Laboratories. The present aim of this detector is to achieve a sensitivity sufficient to detect bursts of gravitational radiation from sources located in our Galaxy and in the local group. Progress in transducer technology is likely to lead to sensitivities that will enable us to observe events from sources as far away as the Virgo cluster of galaxies. We describe the cryogenic apparatus, readout system, cosmic–ray veto system, and give first results obtained during one year of continuous operation at T=0.1K. In particular the Brownian noise of the detector at T=0.1 K was measured. The measured strain sensitivity was |6 10–22 Hz–1/2 at the frequencies of the two modes, 908 Hz and 924 Hz, with bandwidths of about 1 Hz. |
| 87 | 1997-02-05 | NESTOR: Deep Underwater Neutrino Astronomy | 1997 | LNF-97-006(P).pdf | NESTOR Collaboration: Presented by L. Trasatti | NESTOR[2] is the first step toward the construction of a neutrino telescope using the depth of the sea both as a shield against atmospheric muons and as detector material. The experiment is based on the detection of Cerenkov radiation produced by neutrino muons using 12' photomultiplier tubes. 168 PMTs will be arranged in 12 floors separated by 20 m each and with a radius of 16 m. |
| 4236 | 1997-01-30 | Operation and Performances of a High Speed Dynamic Pattern Detector | 1997 | INFN-TC_97-4.pdf | F. Fabozzi, P. Parascandolo | |
| 4175 | 1997-01-27 | The Emulsion Technique for Short, Medium and Long Baseline um - ur Oscillation Experiments | 1997 | INFN-AE_97-6.pdf | A. Ereditato, K. Niwa, P. Strolin | |
| 105 | 1997-01-24 | Consistency of Orthodox Gravity | 1997 | LNF-97-3(P).pdf | S. Bellucci, A. Shiekh | A recent proposal for quantizing gravity is investigated for self consistency. The existence of a fixed-point all-order solution is found, corresponding to a consistent quantum gravity. A criterion to unify coupling is suggested, by invoking an application of our argument to more complex system. |
| 4172 | 1997-01-24 | Performance of Transition Radiation Detector of the MACRO Experiment | 1997 | INFN-AE_97-3.pdf | Macro Collaboration | |
| 4173 | 1997-01-24 | Performance of the MACRO Detector at Gran Sasso; Moon Shadow and Seasonal Variations | 1997 | INFN-AE_97-4.pdf | Macro Collaboration | |
| 4174 | 1997-01-24 | Seasonal Variation in the Underground Muon Intensity as seen in MACRO | 1997 | INFN-AE_97-5.pdf | Macro Collaboration | |
| 84 | 1997-01-23 | Beam–Gas Background Calculation for DEAR | 1997 | LNF-97-002(IR).pdf | S. Guiducci, M. A. Iliescu | The present paper describes the results obtained from a Monte Carlo simulation of the particles lost in the DAY-ONE Interaction Region (IR) of the DAFNE machine in the DEAR configuration. Coulomb scattering on the nuclei of residual gas and beam-gas Bremsstrahlung, which are the main sources of background in the initial phase of machine operation, were considered. A ray-tracking program (TURTLE) was used to follow the trajectories of the particles in the rings and to evaluate the number of particles that hit the vacuum chamber in the interaction region. |
| 83 | 1997-01-14 | RF System and Related Multibunch Instabilities Issues for the ELFE at HERA Stretcher | 1997 | LNF-97-001(IR).pdf | M. Migliorati, L. Palumbo, M. Serio, B. Spataro, F. Tazzioli | |
| 4170 | 1997-01-07 | The Cosmic Ray Antiproton Flux between 0.62 and 3.19 GeV Measured near Solar Minimum | 1997 | INFN-AE_97-1.pdf | Wizard Collaboration: M. Boezio, P. Carlson, T. Francke, N. Weber, M. Suffert, M. Hof, W. Menn, M. Simon, S.A. Stephens, R. Bellotti, F. Cafagna, M. Castellano, M. Circella, G. De Cataldo, C. De Marzo, N. Giglietto, P. Spinelli, M. Bocciolini, P. Papini, A. Perego, S. Piccardi, P. Spillantini, G. Basini, M. Ricci, A. Codino, N. Finetti, C. Grimani, M. Concusso, M. Casolino, M.P. De Pascale, A. Morselli, P. Picozza, R. Sparvoli, G. Barbiellini, U. Bravar, P. Schiavon, A. Vacchi, N. Zampa, J.W. Mitchell, J.F. Ormes, R.E. Streitmatter, R.L. Golden, S.J. Stochaj | |
| 4233 | 1997-01-07 | Cryogenic Performance of Monolithic Mesfet Preamplifiers for LAr Calorimetry | 1997 | INFN-TC_97-1.pdf | G. Battistoni, D.V. Camin, N. Fedyakin, G. Pessina, M. Sironi | |
| 4171 | 1997-01-07 | Summary of the Conference | 1997 | INFN-AE_97-2.pdf | C. Caso | |
| 4234 | 1997-01-07 | Realization of Reliable Cryogenic ASIC's Using GaAs Ion-Implanted Mesfet Technology | 1997 | INFN-TC_97-2.pdf | G. Battistoni, D.V. Camin, N. Fedyakin, G. Pessina, F. Sabatini, P. Sala | |
| 4235 | 1997-01-07 | Cryogenic Front-End Electronics for Fast Noble-Liquid Calorimetry | 1997 | INFN-TC_97-3.pdf | G. Battistoni, D.V. Camin, N. Fedyakin, G. Pessina, P. Sala | |
| 204 | 1996-12-20 | A Status Report Concerning Theoretical Predictions for Various Kaon Decays | 1996 | LNF-96-075(P).pdf | G. Isidori | A short overview of theoretical predictions for various kaon decays presented. Particular attention is devoted to pure and radiative nonleptonic decays in the framework of Chiral Perturbation Theory. The relevance of KLOE’s future results [1, 2] to improve our knowledge of kaon physics and more generally of the Standard Model at low energy is also emphasized. |
| 205 | 1996-12-20 | X - ray Optics of a Dynamical Sagittal- Focusing Monochromator ON THE GILDA Beamline at the ESRF | 1996 | LNF-96-076.pdf | S. Pascarelli, F. Boscherini, F. D' Acapito, J. Hrdy, C. Meneghini, S. Mobilio | The performance of a dynamical sagittal-focusing monochromator for hard X-rays is described. It consists of a flat first crystal and a diamond-shaped ribbed second crystal which is clamped by its central rib and dynamically bent by applying a force on its two apices. The system has proved to perform very well on the GILDA beamline at the ESRF. The horizontal acceptance varies with energy and with focusing geometry as predicted theoretically; the total available horizontal fan of radiation (3.6 mrad) is in fact collected in the 1:3 geometry. The system is routinely run in a dynamical focusing mode for XAFS spectrometry in the energy range 5-30 KeV with Si(311) crystals, with a constant spot size FWHM~1mm on the sample and without degradation of energy resolution or reproducibility. Using simple geometrical considerations we calculate the variations of the horizontal profile of the reflected beam during rocking-curve scans in different focusing geometries and find them in agreement with observed ones. Not only is this is a practical aid in alignment but it illustrates the X-ray optics of sagittal focusing in an elegant way. |
| 206 | 1996-12-20 | Performance and Preliminary Results of the Cosmic–Ray Detector Associated with NAUTILUS | 1996 | LNF-96-077(P).pdf | P. Astone, M. Bassan, P. Bonifazi, P. Carelli, D. Castellazzi, C. Cosmelli, E. Coccia, V. Fafone S. Frasca, A. Marini, G, Mazzitelli, I. Modena, G. Modestino, A. Moleti, G. V. Pallottino, M. A. Papa, G. Pizzella, P. Rapagnani, F. Ricci, F. Ronga, R. Terenzi, M. Visco, L. Votano | A cosmic-ray detector surrounds the gravitational wave antenna NAUTILUS operating at Frascati Laboratory. The expected numbers of events from the interactions of high-energy hadrons and muons and multihadron showers wit the antenna are shown together with preliminary results of the search for coincidences between the two detectors. |
| 4129 | 1996-12-20 | Power Supply System for the Tracker Detector of the AMS Experiment | 1996 | INFN-AE_96-43.pdf | M. Menichelli, R. Battiston, M. Bizzarri, B. Checcucci, G. Castellini, P. Bakki, A. Banfalvi, S. Blasko, A. Gschwindt, J. Szabo,, L. Fontani, G. Pasuello | |
| 4161 | 1996-12-19 | Syrmep: an Innovative Detection System for Soft X-Rays | 1996 | INFN-TC_96-23.pdf | F. Arfelli, G. Barbiellini, V. Bonvicini, A. Bravin, G. Cantatore, E. Castelli, P. Cristaudo, M. Di Michiel, R. Longo, A. Olivo, S. Pani, D. Pontoni, P. Poropat, M. Prest, A. Rashevsky, F. Tomasini, G. Tromba, A. Vacchi | |
| 4162 | 1996-12-19 | A Digital Readout System for the Syrmep Silicon Strip Detectors | 1996 | INFN-TC_96-24.pdf | F. Arfelli, G. Barbiellini, V. Bonvicini, A. Bravin, G. Cantatore, E. Castelli, P. Cristaudo, M. Di Michiel, R. Longo, A. Olivo, S. Pani, D. Pontoni, P. Poropat, M. Prest, A. Rashevsky, F. Tomasini, G. Tromba, A. Vacchi, E. Vallazza | |
| 4160 | 1996-12-17 | Front-End Card Design for the RPC Detector at Babar | 1996 | INFN-TC_96-22.pdf | N. Cavallo, F. Fabozzi, P.L. Paolucci, L. Parascandolo, P. Parascandolo, D. Piccolo, R. Pierro | |
| 4127 | 1996-12-17 | Multiple Measurements of Time of Flight, Position and Energy Deposit of Ionizing Particles by Solid State Detectors | 1996 | INFN-AE_96-41.pdf | A. Codino | |
| 4128 | 1996-12-17 | Optimum Rigidity Range for Cosmic Antihelium Quest | 1996 | INFN-AE_96-42.pdf | A. Codino, M. Lanfranchi | |
| 203 | 1996-12-14 | Performance of the New Plastic Scintillator NE110A for the CLAS Large Angle Calorimeter | 1996 | LNF-96-074.pdf | P. Rossi, E. Polli, M. Albicocco, H. Avakian, N. Bianchi, G. P. Capitani, A. Deppman, E. De Sanctis, V. Giourdjian, P. Levi Sandri, S. Mansanta, M. Mirazita, V. Muccifora, A. R. Reolon, M. Taiuti, A. Rottura, M. Anghinolfi, M. Battaglieri, P. Corvisiero, E. Golovach, A.Longhi, V. I. Mokeev, M. Olcese, G. Ricco, M.Ripani, M.Sanzone, V. Sapunenko, R. Morandotti | The performance of the new NE110A plastic scintillator has been measured in connection with the construction of the AIACE large angle electromagnetic calorimeter for the CLASS detector at CEBAF. Measurements concerning 2128 scintillator bars 15mm thick, roughly 10cm wide and up to 450cm length are reported. The results show an attenuation length of the order of 400cm, a light output of 40 photoelectrons/MeV and a uniformity >98%. |
| 202 | 1996-12-13 | Measuring the Phase of the J/4 Strong Decay Amplitudes | 1996 | LNF-96-073(P).pdf | R. Baldini, C. Bini, E. Luppi | It is shown that the interference between p`pÆJ/yÆe+e- and p`pÆe+e- can be measured with good accurancy at Fermilab. Therefore the phase of the strong decay amplitude of the J/y with respect to the proton magnetic form factor will be obtained. There are hints, from J/yÆn`n and other J/y decays, of an unexpected ~90Ý phase. |
| 154 | 1996-12-11 | Microstructure and Phase Morphology of Diamond Thin Films by Synchrotron Radiation X-Ray Diffraction | 1996 | LNF-96-025.pdf | G. Cappuccio, M. Leoni, P. Scardi, V. Sessa, M. L. Terranova | Diamond films grown on titanium substrates by hot filament chemical vapour deposition (HF-CVD) were characterised by X-ray diffraction (XRD) measurements using both synchrotron radiation (SR) and a Cu X-ray tube. Grazing incidence diffraction (GID) measurements pointed out the presence of different phases at the film-substrate interface, i.e. titanium hydride (TiH2) and titanium carbide (TiC). The experimental data allowed us to determine, by means of a line broadening analysis (LBA), the crystallographic features and microstrain of the diamond layer and the other phases. |
| 201 | 1996-12-11 | Temperature-Dependent Orientation of Diamond Films on Titanium and Structural Evolution of Interfacial Layers | 1996 | LNF-96-072.pdf | G. Cappuccio, V. Sessa, M. L. Terranova | X-ray diffraction analytical techniques have been used to investigate the influence of the deposition temperature (650-850ÝC) on the composition and microstructure of the transition layers formed at the interface between titanium substrates and diamond thin films. The diamond coatings were produced by hot-filament chemical vapor deposition using a 1% methane/hydrogen mixture. X-ray diffraction analysis, performed both through q-2q scans and at grazing incidence, allowed investigation of the crystallographic properties and of the structural evolution of the various phases (TiC, TiH2, a-Ti) generated inside the intermediate reaction layers. The temperature-dependent orientation of diamond crystallites is discussed with reference to the complex structure of these interfacial layers. |
| 200 | 1996-12-10 | Comparison between Anthropomorphic Mathematical Phantoms Using MCNP and Fluka Codes | 1996 | LNF-96-071.pdf | M. Pelliccioni, M. Pillon | The International Commission on Radiation Protection (ICRP) recommends dose limits for occupational and public exposures in terms of weighted averages of organ and tissue doses. To this end the ICRP introduced the quantity Effective Dose Equivalent in Publication 26, substituted by Effective Dose in Publication 60. Both quantities cannot be measured and are usually evaluated by means of conversion coefficients, calculated using mathematical models of the adult human, the so-called anthropomorphic phantoms. Some of such phantoms exist for various computer codes, but not yet for FLUKA, a Monte Carlo code which simulates the development of showers initiated by high energy particles of energies up to several tens of TeV. An anthropomorphic phantom for the FLUKA code is presented here, together with preliminary results of calculations of the doses produced by photons in the energy range 0.122-90 MeV in a selection of different organs. The results are compared with those obtained for two phantoms running with MCNP: ADAM from GSF and the MCNP version of the FLUKA phantom. In this way, the quality of the FLUKA phantom is tested against the ADAM-GSF phantom and differences of treating physical processes by FLUKA and MCNP are compared. |
| 4126 | 1996-12-10 | A Quantum Gauge Group Approach to the 2D SU(n) WZNW Model | 1996 | INFN-AE_96-40.pdf | P. Furlan, L.K. Hadjiivanov, I.T. Todorov | |
| 267 | 1996-12-04 | The DAFNE F–FACTORY at FRASCATI: Collider Project and Physics Program | 1996 | LNF-96-062(IR).pdf | F.L. Fabbri | The DAFNE F–Factory expected to be operational at the Frascati Laboratory will offer a unique opportunity to clarify many questions on kaon physics remained open for more than 30 years: CP and CPT nonconservation, hypernucleus production and decays, kaonic hydrogen puzzle, kaon rare decays, kaon nucleon scattering length, and others. |
| 199 | 1996-12-03 | K Æ pppg in Chiral Perturbation Theory | 1996 | LNF-96-070(P).pdf | G. D' Ambrosio, G. Ecker, G. Isidori, H. Neufeld | We present a complete analysis of KÆ3pg decays to O(p4) in the low-energy expansion of the Standard Model. We employ the notion of “generalized bremsstrahlung” to take full advantage of expermental information on the corresponding non-radiative KÆ3p decays. |
| 198 | 1996-11-29 | The DAFNE Physics Program | 1996 | LNF-96-069(P).pdf | J. L. Franzini | The physics program of DAFNE is described in this article, as is the general purpose detector KLOE. The current status of KLOE is also briefly summarized. |
| 197 | 1996-11-27 | Further Enhancement of the Critical Temperature up to 105 K of Hydrogen Loaded YBCO Melted Samples by ms Pulsed Electrolysis | 1996 | LNF-96-068(P).pdf | D. Di Gioacchino, P. Tripodi, F. Celani, A. Spallone | In this paper we report results about enhancement of the transition temperatures of Y1Ba2Cu3O7-d melted samples hydrogen loaded (H–YBCO) with high power µs pulsed electrolysis. The fundamental AC magnetic susceptibility has been measured as a function of the temperature for different frequency values of the exciting magnetic field. The H–YBCO sample exhibited a magnetic on–set temperature (Ton) as high as 105K. The susceptibility behavior below the Ton shows significant change of shape. Results, previously reported, on a sintered YBCO pellets have been reproduced using melted YBCO samples. |
| 4159 | 1996-11-27 | Pileup Rejection in a DIGITAL Processor for Spectroscopy with Cryogenic Detectors | 1996 | INFN-TC_96-21.pdf | M. Galeazzi | |
| 195 | 1996-11-26 | The Trigger and Data Acquisition System of the KLOE Experiment | 1996 | LNF-96-066.pdf | F. Bossi | The requirements on the trigger/DAQ system of the KLOE experiment are a challenge in this field: this system has to deal with data rates of the order of 1011 events/year while rejecting background rates at least 103 times larger. Moreover, since the major aim of KLOE is to perform CP violation studies at sensitivities of O(10-4), very stringent conditions are imposed on it, to insure that no biases are introduced at such level. |
| 196 | 1996-11-26 | Clustering-Related Aspects in the Compound Nucleus Formation | 1996 | LNF-96-067.pdf | A. Deppman, J.D.T. Arruda Neto, E. De Sanctis, N. Bianchi | A new approach to describe the compound nucleous formation process, where clustering aspects of the nucleus are taken into account, is worked out, it is worked out. It is shown that quantitative differences between the compound nucleus cross-section of 232Th and 238U, as observed in recent photofission experiments, could be due to the different cluster performation probabilities of these nuclei. |
| 194 | 1996-11-20 | Il Sistema di Rivelatori di Posizione del Fascio per TTF | 1996 | LNF-96-065(NT).pdf | L. Cacciotti, M. Castellano, L. Catani, P. Patteri, F. Tazzioli | È descritto il sistema elettronico di misura della posizione del fascio con i rivelatori a stripline (Beam Position Monitors, BPM), realizzato nella seconda metà del 1995. Sono riportate le procedure di messa a punto e i risultati dei test di caratterizzazione di un sistema completo di monitor ed elettronica, simulando il fascio con un filo percorso da corrente. Sono discussi i problemi relativi alla stabilità della misura in funzione della temperatura, la loro origine e il sistema di calibrazione per la loro correzione software. |
| 192 | 1996-11-19 | Direct Bounds on the Tau Neutrino Mass from LEP | 1996 | LNF-96-063(P).pdf | L. Passalacqua | A review of direct bounds on the mass of the tau neutrino obtained at the LEP collider is presented. In addition to published results it includes preliminary results presented at recent conferences and new results presented at the 1996 Tau Workshop. The different techniques and decay modes employed by the ALEPH, DELPHI and OPAL collaborations are compared. The impact of the theoretical modelling of tau decays is also discussed. The most stringent 95% CL limit on the tau neutrino mass is now obtained by a preliminary ALEPH analysis which combines the results from tÆ5p±(p0)nt and tÆ3p±nt decays. This bound constraints the mass of the tau neutrino below 18.2 MeV/c2. |
| 193 | 1996-11-19 | Experimental Status of the E/l Puzzle | 1996 | LNF-96-064(P).pdf | A. Lanaro | Despite the prolonged experimental effort devoted to the spectroscopy of the E/i mesons, and the intense theoretical debate around this subject, many puzzling issues still prevent from a full understanding of the true scenario. The advent of new and more precise experimental measurements motivates a review on this topic. |
| 4125 | 1996-11-13 | Cosmic Ray Studies Around the 'Knee' of the Primary Spectrum from EAS-TOP | 1996 | INFN-AE_96-39.pdf | G. Navarra | |
| 4169 | 1996-11-13 | Dark Matter Particles | 1996 | INFN-TH_96-7.pdf | V. Berenzisky | |
| 190 | 1996-11-12 | Electroweak Experimental Results at LEP | 1996 | LNF-96-061(P).pdf | M. Pepe Altarelli | Recent data on precision tests of the standard model at LEP are presented and compared with the theoretical expectations. These results are obtained by a preliminary analysis of all the data collected at LEP between 1990 and 1995. |
| 188 | 1996-11-08 | h Æ p0p0gg to 1 - Loop in ChPT | 1996 | LNF-96-059(IR).pdf | S. Bellucci | 1. Introduction: a) motivations, b) status, c) purpose, d) results 2. Kinematics and couplings 3. Decay amplitude (analytic expression): a) tree level, b) one loop 4. Decay width (numerical): a) diphoton energy spectrum, b) partial decay rate [energy cut] 5. Discussion: detectability of chiral loop effects (background suppression) |
| 189 | 1996-11-08 | Resonant Detectors for the Search of Gravitational Waves | 1996 | LNF-96-060(P).pdf | G. Pizzella | An overwiew of the experiments for the search of gravitational waves by means of resonant detectors is given Since 1990 cryogenic resonant antennas have been in operation and data have been recorded by Explorer, Allegro, Niobe and Nautilus. The sensitivity for pulse detection with SNR=1 is now h 6ª10-19 (corresponding to a total energy of less than 0.001 solar masses for a source in the Galatic Center). The sensitivity for monochromatic waves is hª2 10-25 for one year of integration and about 7 10-22/*Hz for a sthocastic background detection. Large resonant detectors operating at 1kHz might reach, in a near future, a spectral amplitude sensitivity of the order of 7 10-24/*Hz and, for pulse and monochromatice wave sensitivity, respectively, h=3 10-22 and hª10-27. Cross-correlating two of such large antennas for one year can give a sensitivity for stochastic background detection of the order of 3 10-26/*Hz, corresponding to a ratio between the gw energy density to that needed for a close Universe of 10-6. |
| 4124 | 1996-11-05 | Astro-Particle Physics with the Alpha Magnetic Spectrometer (AMS) | 1996 | INFN-AE_96-38.pdf | R. Battiston | |
| 187 | 1996-10-31 | Gravitational Intertaction to One Loop in Effective Quantum Gravity | 1996 | LNF-96-058(P).pdf | A. Akhundov, S. Bellucci, A. Shiekh | We carry out the first step of a program conceived, in order to build a realistic model, having the particle spectrum of the standard model and renormalized masses, interaction terms and couplings, etc. which include the class of quantum gravity corrections, obtained by handling gravity as an effective theory. This provides an adequate picture at low energies, i.e. much less than the scale of strong gravity (the Planck mass). Hence our results are valid, irrespectively of any proposal for the full quantum gravity as a fundamental theory. We consider only non-analytic contributions to the one-loop scattering matrix elements, which provide the dominant quantum effect at long distance. These contributions are finite and independent from the finite value of the renormalization counter terms of the effective lagrangian. We calculate the interaction of two heavy scalar particles, i.e. close to rest, due to the effective quantum gravity to the one loop order and compare with similar results in the literature. |
| 4123 | 1996-10-31 | Extensive Air Showers and Hadronic Interactions | 1996 | INFN-AE_96-37.pdf | G. Battistoni | |
| 4158 | 1996-10-30 | A Set Up for Testing the Primary Inization Counting in a Drift Chamber at Normal Condition | 1996 | INFN-TC-96-20.pdf | L. Cerrito, M. Gatta, M.Imhof, L. Paoluzi, E. Santovetti, S.Weseler | |
| 185 | 1996-10-29 | Transition Undulator Radiation (TUR) as a Beam Diagnostics and a High Brilliance Infrared Source | 1996 | LNF-96-056(P).pdf | M. Castellano | The Transition Undulator Radiation (TUR), introduced by K. J. Kim, is derived as an interference between two bremsstrahlung amplitudes at the entrance and exit of the undulator. The result is applied to the TTF FEL experiment, for which this radiation, in the visible bandwidth, may be used as an electron beam non intercepting diagnostics, while in the far infrared region, due to the coherent emission by each microbunch, is a high brilliance source synchronized with the higher energy FEL radiation. |
| 186 | 1996-10-29 | Chiral Perturbation Theory and Nucleon Polarizabilities | 1996 | LNF-96-057(P).pdf | D. Babusci, G. Giordano, G. Matone | The available experimental data concerning the unpolarized cross section for the Compton scattering on the nucleon at low energy are compared with the predictions of the heavy baryon chiral perturbation theory (HBChPT) at the order q3. |
| 4157 | 1996-10-28 | A CMOS Semi-Custom ASIC for the Clustering of Bit Strings of the Aleph Hadron Calorimeter | 1996 | INFN-TC_96-19.pdf | F. Loddo, G. Maggi, A. Ranieri, F. Ruggieri | |
| 4135 | 1996-10-28 | A Calorimetric Measurement of Ho163 Spectrum by Means of a Cryogenic Detector | 1996 | INFN-BE_96-7.pdf | P. Meunier, C. Salvo | |
| 4136 | 1996-10-25 | Development of a Cryogenic m-Calorimeter with a BeO Absorber to Investigate the Be7 Ground State Decay | 1996 | INFN-BE_96-9.pdf | M. Galeazzi, P. Meunier | |
| 4138 | 1996-10-23 | Limited-Diffraction Solutions to Maxwell and Schroedinger Equations | 1996 | INFN-FM_96-1.pdf | J.Y. Lu, J. F. Greenleaf, E. Recami | |
| 4134 | 1996-10-23 | Detection of Be7 Ground State Decay by Means of a Cryogenic m-Calorimeter | 1996 | INFN-BE_96-5.pdf | M. Galeazzi, P. Meunier | |
| 4168 | 1996-10-18 | On Neutralino Stars as Microlensing Objects | 1996 | INFN-TH_96-6.pdf | V. Berenzisky, A. Bottino, G. Mignola | |
| 183 | 1996-10-17 | Experimental Limits on Antigravity in Extended Supergravity | 1996 | LNF-96-054(P).pdf | S. Bellucci, V. Faraoni | We present a research communicated by Stefano Bellucci to section 1 - high energy physics and elementary particles - of the LXXXII National Meeting of the Italian Physics Society, held September 1996 in Verona. |
| 184 | 1996-10-17 | Coupling Impedance of a Hole in a Coaxial Beam Pipe | 1996 | LNF-96-055.pdf | S. De Sanctis, M. Migliorati, L. Palumbo, M. Zobov | n this paper we derive the impedance of a circular hole in the inner tube of a coaxial beam pipe. The method used differs from the classic Bethe’s diffraction theory, since, in the calculation of the magnetic and electric dipole moments, we take into account also the scattered fields in the aperture to match the power conservation law. The low-frequency impedance shows a real contribution accounting for the TEM waves propagating within the coaxial waveguide. |
| 4156 | 1996-10-17 | A Proposal for Measurements of the Limiting Electric and Magnetic Fields of Superconducting Niobium Cavities and of Niobium Nased Compounds | 1996 | INFN-TC_96-18.pdf | G. Gemme, R.Parodi, G. Bienvenu, T. Garvey | |
| 4122 | 1996-10-17 | AMS (Alpha Magnetic Spectrometer) Experiment for Antimatter, Dark Matter Search on International Space Station Alpha | 1996 | INFN-AE_96-36.pdf | B. Alpat | |
| 4119 | 1996-10-11 | Study of Laser Induced Ionization in Proportional and Streamer Tubes Filled with Helium Based Gas Mixtures | 1996 | INFN-AE_96-33.pdf | G. Battistoni, A. Candela, I. De Mitri, U. Denni, A. Frani, F. Guarino, V. Nassini, A. Sciubba | |
| 4120 | 1996-10-11 | Superheavy Magnetic Monopoles Trapped into the Sun and the Solar System | 1996 | INFN-AE_96-34.pdf | S.P. Ahlen, I. De Mitri, J.T. Hong, G. Tarle | |
| 4121 | 1996-10-11 | Energy Loss of Supermassive Magnetic Monopoles and Dyons in Main Sequence Stars | 1996 | INFN-AE_96-35.pdf | S.P. Ahlen, I. De Mitri, J.T. Hong, G. Tarle | |
| 4154 | 1996-10-09 | Calculation of the Forces in the Coils of the Atlas Barrel Toroid and their Simulation in the B0 Model with a Magnetic Mirror | 1996 | INFN-TC_96-16.pdf | E. Acerbi, M. Sorbi | |
| 4155 | 1996-10-09 | Progetto di una Connessione ATM a 34 Mb/s Via Ponte Radio fra i Laboratori Nazionali di Frascati e le Sezioni INFN di Roma1 | 1996 | INFN-TC_96-17.pdf | A. Brunengo, T. Ferrari, C. Olivieri, C. Salvo | |
| 4117 | 1996-10-09 | Scaling Violations, Fragmentation Functions and g/g Jets at LEP | 1996 | INFN-AE_96-31.pdf | L. Vitale | |
| 4118 | 1996-10-09 | Measurement of Spin Effects in 2Ý Æ t+t- Decays as a Test of the Standard Model | 1996 | INFN-AE_96-32.pdf | W. Bonivento | |
| 181 | 1996-10-08 | Extension of the Intranuclear Cascade Model for Photonuclear Reactions at Energies up to 10 GeV | 1996 | LNF-96-052(P).pdf | A. S. Iljinov, I. A. Pshenichnov, N. Bianchi, E. De Sanctis, V. Muccifora, M. Mirazita, P. Rossi | The intranuclear cascade (INC) model for photonuclear reactions has been extended at energies up to 10 GeV. To this end a phenomenological method for exclusive description of the elementary gN-interaction has been developed taking into account both the resonance contribution from the two-body chanels gNÆpB* and gNÆM*N (B* and M* being baryon and meson resonances) and the non-resonant statistical contribution from multi-body channels gNÆipN(2SiS8). This method well describes a wide range of gN data up to Eg~10 GeV. The INC model takes into account rescattering and absorption in a nucleus of pions, nucleons, and h-, r-, w-mesons generated in the gN-interaction. The evaporation, fission and multifragmentation of highly excited residual nucleus have also been taken into account. As a result of the Monte Carlo simulation an event of gA-reaction is generated which contains mesons, nucleons, nuclear fragments, fission fragments and final nuclide. The model well describes the available data on meson production and proton emission obtained with quasi-monochromatic photons. |
| 182 | 1996-10-08 | The Role of Chiral Loops in hÆ p0p0gg | 1996 | LNF-96-053(P).pdf | S. Bellucci, G. Isidori | We consider the rare decay hÆp0p0gg and calculate the non-resonant contribution to the amplitude to one loop in Chiral Perturbation Theory. We display our result as both a diphoton energy spectrum and a partial decay rate as a function of the photon energy cut. It turns out that the one-loop correction can be numerically very important and could be detected, at sufficiently large centre-of-mass photon energies, from a measurement of the partial decay width. |
| 4114 | 1996-10-03 | High Energy Cosmic Ray Physics with the MACRO Detector at Gran Sasso: Part I. Analysis Methods and Experimental Results | 1996 | INFN-AE_96-28.pdf | Macro Collaboration | |
| 4115 | 1996-10-03 | High Energy Cosmic Ray Physics with the MACRO Detector at Gran Sasso: Part II. Primary Spectra and Composition | 1996 | INFN-AE_96-29.pdf | Macro Collaboration | |
| 4116 | 1996-10-03 | Multicomponent Extensive Air Shower Observations at EAS-TOP | 1996 | INFN-AE_96-30.pdf | EAS - TOP Collaboration | |
| 4166 | 1996-10-03 | Clusters of Galaxies as a Storage Room for Cosmic Rays | 1996 | INFN-TH_96-4.pdf | V.S. Berenzisky, P. Blasi, V.S. Ptuskin | |
| 4167 | 1996-10-03 | Cosmological Density of Baryons and High Energy Radiation from Clusters of Galaxies | 1996 | INFN-TH_96-5.pdf | V.S. Berenzisky, P. Blasi, V.S. Ptuskin | |
| 4153 | 1996-10-02 | Magnetic Field, Multipole Expansion and Peak Field in 2D for Superconducting Accelerator Magnet | 1996 | INFN-TC_96-15.pdf | G. Ambrosio, G. Bellomo | |
| 180 | 1996-09-27 | Anatomy of the Higgs Mass Spectrum | 1996 | LNF-96-051(P).pdf | P. Q. Hung, G. Isidori | We analyze the implications of a Higgs discovery on possible “new-physics” scenarios, for mH up to ~700 GeV. For this purpose we critically review lower and upper limits on the Higgs mass in the SM and in the MSSM, respectively. Furthermore, we discuss the general features of possible “heavy” (mH>~ 2mZ) Higgs scenarios by means of a simple heavy-fermion condensate model. |
| 179 | 1996-09-26 | Performance of F101 Radiation Resistant Lead Glass Shower Counters | 1996 | LNF-96-050.pdf | H. Avakian, N.Bianchi, G. P. Capitani, E. De Sanctis, A. Fantoni, V. Giourdjian, R. Mozzetti, V. Muccifora, M. Nupieri, A. R. Reolon, P. Rossi, J.F. J. Van Den Brand, M. Doets, T. Henkes, M. Kolsterin, A. Airapetian, N. Akopov, M. Amarian, R. Avakian, A. Avetissian, V. Garibian, S. Taroian, P. Galumian, A. Simon, B. Bray, B. Filippone, A. Lung | The performance of F101 lead glass as a Cherenkov radiation material was studied. A 3x3 array of 9x9 cm2 and 50 cm length counters showed an energy resolution of ª5.0%/žE(GeV), good linearity in the energy range from 1 to 25 GeV and p-/e rejection ª4x10-4. |
| 4152 | 1996-09-20 | Effect of the Linseed Oil Surface Treatment on the Performances of Resistive Plate Chambers | 1996 | INFN-TC_96-14.pdf | M. Abbrescia, A. Colaleo, G. Iaselli, M. Maggi, B. Marangelli, S. Natali, S. Nuzzo, A. Ranieri, F. Romano, V. Arena, G. Bonomi, G. Gianini, G. Liguori, S.P. Ratti, C. Riccardi, L. Viola, P. Vitullo | |
| 177 | 1996-09-17 | Upper Limit for a Gravitaional-Wave Stochastic Background with the Explorer and Nautilus Resonant Detectors | 1996 | LNF-96-048(P).pdf | P. Astone, M. Bassan, P. Bonifazi, P. Carelli, E. Coccia, C. Cosmelli, V. Fafone, S. Frasca, A. Marini, G. Mazzitelli, I. Modena, G. Modestino, A. Moleti, G. V. Pallottino, M. A. Papa, G. Pizzella, P. Rapagnani, F. Ricci, F. Ronga, R. Terenzi, M. Visco, L. Votano | We discuss the sensitivity of resonant-mass gravitational-wave detectors to a cosmic stochastic background of gravitational waves. We report the experimental upper limits given by the gravitational wave detectors EXPLORER and NAUTILUS. |
| 4151 | 1996-09-17 | EBOFERA: a Companion for Fera ADC'S | 1996 | INFN-TC_96-13.pdf | A. Ordine, A. Boiano, P. Parascandolo, A. D'Onofrio, L. Campajola,, A. De Rosa, G. Inglima, M. La Commara, V. Roca, M. Romano, M. Romoli, D. Pierroutsakou, M. Sandoli, f. Terrasi | |
| 4133 | 1996-09-17 | Subthreshold Pion Production from Proton-Nucleus Collisions | 1996 | INFN-BE_96-4.pdf | A. Sibirtsev | |
| 173 | 1996-09-10 | AC Susceptibility Measurements of YBCO Sintered Pellets Loaded with Hydrogen by ms Pulsed Electrolysis | 1996 | LNF-96-044(R).pdf | D. Di Gioacchino, M. Boutet, A. Spallone, P. Tripodi, F. Celani | The research about the hydrogen in metals has attracted the attention for reasons motivated both from a basic as well as an applied point of view. It is evident there is an overlap between these approaches. Some possible application are discussed in [18]. Actually there is a general interest in the dynamics of hydrogen (or deuterium) in metals, since these are linked with many physical properties of such systems, in particular superconductivity, electronic properties and hydrogen diffusion, a great abundance of experimental research exists in this field. Our aim is to study the effects of hydrogen (and deuterium) on superconducting features of metals (as Pd, Ni and so on) and of high critical temperature superconducting copounds Y1Ba2Cu3O7(YBCO). In this chapter we will deal with the hydrogen loading of YBCO. The hydrogen charging has been performed by means an innovative electrochemical procedure, using very high peak current (up to 15.2 A) with a short time duration (1.3+5 ms) with a repetition rate of 5 kHz. The procedure has been performed at room temperature in an aqueous environment. |
| 174 | 1996-09-10 | Dissipative Effects Near the Transition Temperature of High Tc Superconductor | 1996 | LNF-96-045(R).pdf | D. Di Gioacchino, S. Pace, A. M. Testa, P. Tripodi, F. Celani, M. Polichetti | The complex magnetic susceptibility of oxide superconductors near the transition temperature has been computed as a function of temperature and frequency by numerical solution of the non linear, flux diffusion equation. For field values much lower than the upper critical field, a description of dissipative effects in terms of the conventional flux creep and flux fluw pictures is not able to reproduce experimental data. |
| 175 | 1996-09-10 | Seven Harmonic Susceptibilities in Oxigen and Hydrogen Loading of Sintered YBCO by gs Pulsed Electrolysis in an Aqueous Solution at Room Temperature | 1996 | LNF-96-046(R).pdf | P. Tripodi, D. Di Gioacchino, F. Celani | The complex AC susceptibility of high Tc superconducting materials (cn=c’n+c’’n) has been described in terms of the first seven harmonic component of Fourier series. Has been measured the c’n and c’’n (n=1,7) of sintered YBa2 Cu3O7-x (YBCO) bulk oxygen and hydrogen loaded samples versus amplitude and frequency of AC magnetic field at fixed temperature. The samples have been loaded by ms current pulses electrolysis in an aqueous solution (0.3N LiOH+H2O) at room temperature. In addition to the simplicity of the experimental setup, this procedure allows to obtain extremely high equivalent hydrogen/oxygen gas pressure on the surface of the electrodes. The YBCO electrode is polarized by short pulse width (0.5-10ms) and high power (120 W) peaks with a variable repetition rate (0.1-10000 Hz). The pulses are obtained by an home-made pulse generator. The differences in the behaviour of the susceptibilities harmonic component between the deficiency and oxygen or hydrogen loaded samples give us the possibility to connect the susceptibilities with variations of the flux pinning in respect to normal losses in the superconducting materials. The loading can be a good probe to have information on the mechanism of the processes that sustain the critical current density Jc in this situation these effects appear strongly dependent on the loading condition. By comparison of this measurements has been observed drastic change in behaviour of susceptibility. |
| 176 | 1996-09-10 | Hysteretic and AC Losses of High Tc Superconductors by Numerical Solution of the Nonlinear Magnetic Diffusion Equation | 1996 | LNF-96-047(R).pdf | D. Di Gioacchino, P. Tripodi, F. Celani, A. M. Testa, S. Pace | The complex AC susceptibility (c) of high Tc superconducting materials has been described in terms of hysteretic and AC losses. By including both flux creep and flux flow resistivities in the expression of the flux diffusivity, induction profiles have been numerically calculated from the non linear flux diffusion equation. The imaginary part of c has been evaluated as function of temperature, frequency and amplitude of the applied magnetic field. The role of pinning and AC losses occuring in high Tc materials is discussed. |
| 4112 | 1996-09-05 | Admissible Representations-Correlators, Fusion Matrices and Structure Constants | 1996 | INFN-AE_96-25.pdf | P. Furlan, A.CH. Ganchev, V.B. Petkova | |
| 4113 | 1996-09-05 | LNGS – Annual Report 1995 | 1996 | INFN-AE_96-27.pdf | AA.VV. | |
| 170 | 1996-09-03 | The W (sl(N+3), sl(3)) Algebras and their Contractions to W3 | 1996 | LNF-96-041(P).pdf | S. Bellucci, S. Krinovos, A. Sorin | We construct the nonlinear W(sl(N+3), sl(3)) algebras and find the spectrum of values of the central charge that gives rise, by contracting the W(sl(N+3, sl(3)) algebras, to a W3 algebra belonging to the coset W((sl(N+3), sl(3))/(u(1)¦sl(N)). Using the tool of embedding the W(sl(N+3), sl(3)) algebras into linearizing algebras, we construct new realizations of W3 modulo null fields. The possibility to reproduce, within the conformal linearization framework, the central charge spectrum for minimal models of the nonlinar W(sl(N+3), sl(3)) algebras is discussed at the end. |
| 171 | 1996-09-03 | A New Non-Intercepting Beam Size Diagnostics Using Diffraction Radiation from a Slit | 1996 | LNF-96-042(P).pdf | M. Castellano | A new non intercepting beam size diagnostics for high charge electron beams is presented. This diagnostics is based on the analysis of the angular distribution of the 'diffracted' transition radiation emitted by the beam when crossing a slit cut in metallic foil. It allows a resolution better then the radiation transverse formation zone. Numerical results based on the parameters of the TTF FEL beam are given as examples. |
| 172 | 1996-09-03 | The KLOE Trigger System Addendum to the KLOE Technical Proposal | 1996 | LNF-96-043(IR).pdf | The KLOE Collaboration | |
| 169 | 1996-08-26 | Interaction of High Energy Muons and Hadrons with A Large Aluminium Spherical Resonant Detector | 1996 | LNF-96-040(P).pdf | G. Mazzitelli, M. A. Papa | The aim of this work is to evaluate the effects of high energy hadrons and muons on a large spherical aluminum detector of 3m of diameter. The interaction of single hadrons and muons has been simulated and the average counting rate has been calculated. Analytical estimation of Extensive Air Shower and Multihadron Shower effect is also reported. |
| 4150 | 1996-08-26 | Ferrous-Sulphate-Doped Agarose Gels for N.M.R. Dosimetry. 3-D Dose Determinations in B.N.C.T. and Depth-Dose Profiling in Proton Therapy | 1996 | INFN-TC_96-12.pdf | G. Gambarini , C. Birattari, M.L. Fumagalli, D. Monti, P. Salvadori | |
| 4149 | 1996-08-21 | Experimental Results of a Transmission Line Compression Circuit for Low Impedance Pulse Power Generation | 1996 | INFN-TC_96-11.pdf | V. Nassisi | |
| 168 | 1996-07-30 | New Upper Limits for H-Particle Production in -pXe Annihilation at Low Energy | 1996 | LNF-96-039.pdf | V. V. Barmin, V. G. Barylov, S. F. Chernukha, G. V. Davidenko, V. S. Demidov, A. G. Dolgolenko, V. A. Ergakov, V. M. Golubchikov, V. E. Lukhmanov, V. A. Matveev, A. G. Meshkovsky, G. S. Mirosidi, V. A. Shebanov, N. N. Shishov, A. A. Sibirtsev, Yu. V. Trebukovsky, B. S. Volkov, N. K. Zombkovskaya, C. Guaraldo, F. Nichitiu, C. Petrascu, A. Haatuft, A. Halsteinslid, K. Myklebost, J. M. Olsen, K. M. Danielsen, T. Jacobsen | study of the reactions `pXeÆK+K+X, `pXeÆK+H(HÆS-p)X and `pXeÆK+K+H(HÆS-p)X was performed using the 700-litre xenon bubble chamber DIANA, exposed to the 1 GeV/c antiproton beam of ITEP (Moscow). From a sample of 7.82105 antiproton annihilation at low energy in xenon nuclei 4 events were observed for the reaction `pXe|ÆK+K+X at rest (P`p £ 400 MeV/c) and 8 for the same reaction in flight (400£P`p£ 900 MeV/c). The corresponding probabilities turned out to be 3.1210-5 and 3.4210-5, respectively. No H-event was found in the two semi-inclusive reactions `pXeÆK+HX and `pXeÆK+K+HX. This lead to upper limits 6210-6 and 8210-6 (90% C.L.) respectively. The corresponding upper limit for the fully inclusive reaction `pXeÆHX turned out to be 1.2210-5 (90%C.L.), which ìs about one order of magnitude lower than the actual value reported in the literature. |
| 4110 | 1996-07-30 | Gamma-Ray Energy Determination Using Neural Network Algorithms for a Imaging Silicon Calorimeter | 1996 | INFN-AE_96-23.pdf | R. Borisyuk, M. Casolino, M.P. De Pascale, A. Morselli, P. Picozza, A. Ogurtsov, M. Ricci, R. Sparvoli | |
| 4111 | 1996-07-30 | Deviations from the Superposition Model in a Dual Parton Model Applied to Cosmic Ray Interactions with Formation Zone Cascade in Both Projectile and Target Nuclei | 1996 | INFN-AE_96-24.pdf | G. Battistoni, C. Forti, J. Ranft, S. Roesler | |
| 4132 | 1996-07-30 | Neutral Pion and Hard Photons Production in Heavy-Ion Collisions Around 100 MeV/Nucleon | 1996 | INFN-BE_96-3.pdf | A. Badalà, R. Barbera, A. Palmeri, G.S. Pappalardo, F. Riggi, A.C. Russo, R. Turrisi | |
| 162 | 1996-07-29 | DAFNE Machine Project | 1996 | LNF-96-033(P).pdf | G. Vignola, DAFNE Project Team | DAPHNE, a high luminosity e+/e- \\Phi-factory, is presently under construction in Frascati. The beginning of the collider commissioning is scheduled by winter 1997, with a short term luminosity goal L=1,3 10^32 cm^-2 sec^-1. DAPHNE shall be the first of the new generation of very luminosity colliders, called factories, to come in operation. Other factories under construction are PEP-II [1] and KEK-B [2]: first collition, for both machines, is planned for 1998. |
| 163 | 1996-07-29 | Alignment Procedure for the VIRGO Interferometer: Experimental Results from the Frascati Prototype | 1996 | LNF-96-034(P).pdf | D. Babusci, H. Fang, G. Giordano, G. Matone, L. Matone, V. Sannibale | A small fixed-mirrors Michelson interferometer has been built in Frascati to experimentally study the alignment method that has been suggested for VIRGO. The experimental results are excellent and fully confirm the adequacy of the method. The minimum angular misalignment that can be detected in the presented set-up is 10 nrad. |
| 164 | 1996-07-29 | The Local Structure of Ca-Na Pyroxenes.I. Xanes Study at the Na K-Edge | 1996 | LNF-96-035(P).pdf | A. Mottana, T. Murata, Ziyu Wu, A. Marcelli, E. Paris | X–ray absorption Na K–edge spectra have been recorded on synthetic endmember jadeite and on a series of natural Ca–Na pyroxenes compositionally straddling the Jd–Di. The disordered C2/c members of the series are systematically different from the ordered P2/n members. These differences can be interpreted and explained by comparing the experimental spectra with theoretical spectra. These have been calculated by the multiple–scattering formalism from the atomic positional parameters determined by single–crystal X–ray diffraction structure refinement on the same samples. In the full multiple scattering region of the spectrum (1075 to 1095 eV) C–pyroxenes exhibit three features which reflect the 6–2 configuration of the O back–scattering atoms around the Na absorber located at the center of the cluster (site M2 of the jadeite structure). P–pyroxenes show more complicated spectra in which at least four (possibly five) features can be recognized; they reflect the two types of configuration (6–2 and 4–2–2) of oxygens around Na in the two independent M2 and M21 eight–fold coordinated sites of the omphacite structure. A weak, sometimes poorly resolved peak at 1079 eV is diagnostic and discriminates C– from P–pyroxenes. The Garnet Ridge C2/c impure jadeite exhibits a spectrum which is intermediate between those of jadeite and omphacite. The Hedin–Lundqist potential proves best for these insulating materials and allows multiple–scattering calculations agreeing well with experiments. The assessement of the local electronic properties of compositionally and structurally complex minerals such as clinopyroxenes is thus enhanced. |
| 165 | 1996-07-29 | CP Violation in Kaon Decays | 1996 | LNF-96-036(P).pdf | G. D' Ambrosio, G. Isidori | We review the Standard Model predictions of CP violation in kaon decays. We present an elmentary introduction to Chiral Perturbation Theory, four-quark effective hamiltonians and the relation among them. Particular attention is devoted to KÆ3p, KÆ2pg and KÆp`¶¶ decays. |
| 166 | 1996-07-29 | Charmed Meson Fragmentation Functions | 1996 | LNF-96-037(P).pdf | M. Cacciari, M. Greco, S. Rolli, A. Tanzini | Fragmentation functions for heavy-light mesons, like the charmed D, D* mesons, are proposed. They rest on next-to-leading QCD Perturbative Fragmentation Functions for heavy quarks, with the addition of a non-perturbative term describing phenomenologicaly the quarkÆmeson transition. The cross section for production of large pT D, D* mesons at the Tevatron is evaluated in this framework. |
| 167 | 1996-07-29 | Quasi-Real Compton Scattering at Dafne for a Continuous Calibration of the Kloe Detector | 1996 | LNF-96-038(P).pdf | A. Courau, G. Pancheri | Quasi-real Compton scattering, previously used in e+e— and e p collisions for luminosity measurements and detector calibration at PEP and HERA, is discussed for the energy range available at the construenda F-factory DAFNE. We show that the very high rate expected at DAFNE makes this process particularly convenient for a contiuous calibration of the KLOE detector over the full angular range, directly from the data. |
| 4109 | 1996-07-22 | The Performance of MACRO Liquid Scintillator in the Search for Magnetic Monopoles with 10-3<b<1 | 1996 | INFN-AE_96-22.pdf | MACRO Collaboration | |
| 161 | 1996-07-15 | The FINUDA Data Acquisition System | 1996 | LNF-96-032(P).pdf | P. Cerello, V. Filippini, L. Fiore, P. Gianotti, S. Marcello, B. Minetti, A. Raimondo, | A parallel scalable Data Acquisition System, based on VME, has been developed to be used in the FINUDA experiment, scheduled to run at the DAFNE machine at Frascati starting from 1997. The acquisition software runs on embedded RTPC 8067 processors using the LynxOS operating system. The readout of event fragments is coordinated by suitable trigger Supervisor. Data read by different controllers are transported via dedicated bus to a Global Event Builder running on a UNIX machine. Commands from and to VME processors are sent via socket based network protocols. The network hardware is presently ethernet, but it can easily changed to optical fiber. |
| 4148 | 1996-07-15 | IPaccounting Monitoraggio e Produzione di Statistiche di Traffico TCP/IP su Router Cisco per Piattaforme UnixVersione 1.0 | 1996 | INFN-TC_96-10.pdf | R. Gomezel, C. Strizzolo | |
| 4106 | 1996-07-08 | Physics and Astrophysics with Multiple Muons | 1996 | INFN-AE_96-19.pdf | O. Palamara, G. Battistoni | |
| 4107 | 1996-07-08 | The Shapes of the atmospheric Cherenkov Light Images from Extensive air Showers | 1996 | INFN-AE_96-20.pdf | C. Morello, EAS-TOP Collaboration | |
| 4108 | 1996-07-08 | A Limit to the Rate of Ultra High Energy g-Rays in the Primary Cosmic Radiation | 1996 | INFN-AE_96-21.pdf | EAS-TOP Collaboration | |
| 5728 | 1996-07-08 | THE SHAPES OF THE ATMOSPHERIC CHERENKOV LIGHT IMAGES FROM EXTENSIVE AIR SHOWERS. | 1996 | INFN-AE-96-20.pdf | M. Aglietta, B. Alessandro, P. Antonioli, F. Ameodo, L. Bergamasco, M. Bertaina, C.Castagnoli, A. Castellina, A. Chiavassa, G. Cini Castagnoli, B. D'Ettorre Piazzoli, G. Di Sciascio, W. Fulgione, P. Galeotti, P.L. Ghia, M. Iacovacci, G. Mannocchi, C. Melagrana, N, Mengotti Silva, C. Morello, G. Navarra, L. Riccati, O. Saavedra, G.C. Trinchero, P. Vallania, S. Vemetto. | Experimental results on the shapes of atmospheric Cherenkov light images from Extensive Air Showers at E<sub>0</sub> = 10<sup>13</sup> - 10<sup>14</sup> eV are presented. The results are based on data obtained by the first element of the Cherenkov light array of the EAS-TOP experiment at Campo Imperatore (2005 m a.s.l., National Gran Sasso Laboratories, Italy). Images are obtained with pixel field of view <a href='https://www.codecogs.com/eqnedit.php?latex=\omega' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\omega' title='\omega' /></a> = 1.5 10<sup>-5</sup> sr and full field of view <a href='https://www.codecogs.com/eqnedit.php?latex=\Omega' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Omega' title='\Omega' /></a> = 10<sup>-3</sup> sr. The shapes of the images agree with the expectations and their fluctuations are large and significant. Experimental data on the dependence of the image shapes on the detection geometry are reported. The images are well reproduced by two independent side by side detectors, within measured accuracies. Such accuracies (~15% for large photoelectron content) define the level at which each pixel content is related to the shower structure. The presence of events characterized by patterns with multiple structures is proved. It is shown that such features are related to physical fluctuations of the shower structure. |
| 4145 | 1996-07-08 | First Estimate of the Overall HERA-p Transverse Impedance by means of Growt Rate Measurements | 1996 | INFN-TC_96-7.pdf | F. Galluccio, F. Willeke | |
| 4146 | 1996-07-08 | Measurement of the Longitudinal Coupling Impedance of the Hera-b Vertex Detector Chamber | 1996 | INFN-TC_96-8.pdf | F. Galluccio, M.R. Masullo, V.G. Vaccaro, B. Schwingenhuer, F. Klefenz, R. Wanzenberg, M. Wendt | |
| 4147 | 1996-07-08 | Very High Intensity Positron Beam Generated by L.E.P.2 Synchrotron Radiation | 1996 | INFN-TC_96-9.pdf | G. Barbiellini, G. Petrucci | |
| 160 | 1996-07-05 | Fluence to Effective Dose and Effective Dose Equivalent Conversion Coefficients for Photons from 50 keV to 10 GeV | 1996 | LNF-96-031(P).pdf | A. Ferrari, M. Pelliccioni, M. Pillon | Effective dose equivalent and effective dose per unit photon fluence have been calculated by the FLUKA code for various geometrical conditions of irradiation of an anthropomorphic phantom placed in a vacuum. Calculations have been performed for monoenergetic photons of energy ranging from 50 keV to 10 GeV. The agreement with the results of other authors, when existing, is generally very satisfactory. |
| 159 | 1996-06-28 | LNF Spring School & IV EURODAFNE Collaboration Meeting – (Frascati, APRIL 15-20, 1996) | 1996 | LNF-96-030(IR).pdf | A A. V V. | |
| 158 | 1996-06-26 | Bosonization and even Grassmann Variables | 1996 | LNF-96-029(IR).pdf | M.B. Barbaro, A. Molinari, F. Palumbo | We test a new approach to bosonization in relativistic field theories and many-body systems, based on the use of fermionic composites as integration variables in the Berezin integral defining the partition function of the system. The method appears promising since at zeroth order it correctly describes the propagators of the composites, which can be evaluated in a number of significant cases. Still to be established is a general procedure for deriving the free action of the composites starting from the one of the constituents. To shed light on this problem and to explore further features of the method we study a simplified version of the BCS model. In this simple case the action of the composites can indeed be obtained: whether this result can be generalized it remains hewever to be seen. Yet an interesting property of the wave operators appearing in the free actions of bilinear composites already emerges from the simple problem we have treated: here the wave operators do not describe any time evolution, even though they generate the right propagators. This outcome relates to the basic properties of the integrals over the even elements of a Grassmann algebra where the composites live, which entails that the propagators are no longer the inverse of the wave operators. |
| 157 | 1996-06-18 | Commissioning and Operating Experience with the LISA Superconducting Accelerator | 1996 | LNF-96-028(P).pdf | M. Castellano, L. Catani, M. Ferrario, S. Kulinski, M. Minestrini, P. Patteri, S. Tazzari, F. Tazzioli | The commissioning of the LISA superconducting (SC) RF electron linac at INFN Frascati Laboratories has been concluded although, due to a change in program priorities, the full possibilities of the machine have not been exploited. In this report we illustrate the results achieved so far and the difficulties encountered in commissioning, with the hope that this material might be of some help to those who intend to start the enterprise of building a SC linac in a non specialized environment. The part concerning the SC system is particularly stressed, but a relevant attention is also devoted to the traditional room temperature injector, the proper setting of which is fundamental to achieving the high beam quality that such a machine allows. |
| 4105 | 1996-06-17 | A Silicon Pad Detector for E-835 Experiment at Fermilab | 1996 | INFN-AE_96-18.pdf | A. Buzzo, P.Musico, M. Pallavicini, C. Patrignani, E.Robutti | |
| 4144 | 1996-06-17 | Bunched Beams in Axisymmetric System | 1996 | INFN-TC_96-6.pdf | M. De Magistris, V.G. Vaccaro, L.Verolino | |
| 156 | 1996-06-13 | Radiation Protection Aspects of the Decommissioning of the Linac-Adone Storage Ring | 1996 | LNF-96-027(P).pdf | M. Chiti, A. Esposito | An e+e- collider, christened DAFNE (Double Anular F factory for Nice Experiments), optimized for operation at a total energy of 1020 MeV, is under construction at the Frascati National Laboratories (LNF) of the National Institute of Nuclear Physics (INFN). The new machine will be placed into the extisting buildings which in the past housed the Linac-Adone complex, which definitively ceased operation April 26th 1993 and was at once decomissioned. The Linac-Adone complex has operated without stopping up to the 26th of April 1993 except for the ordinary maintenance periods. It was composed by a Linac, capable of accelerating 100mA of e- beam peak current to 400MeV and 1mA of e+ peak current to 365 MeV, in operation since 1964, and by an e+e- storage ring capable of storing 2x1011 particles per beam at 1500 MeV, in opearation since 1967. |
| 4131 | 1996-06-11 | A Comprehensive Eikonal Approach to Heavy-Ion Grazing Collisions | 1996 | INFN-BE_96-2.pdf | F. Zardi | |
| 4104 | 1996-06-10 | Cosmic Ray Antiproton/Electron Discrimination Capability of the CAPRICE Silicon-Tungsten Calorimeter Using Neural Networks | 1996 | INFN-AE_96-17.pdf | R. Bellotti, M. Boezio, M. Castellano, C. De Marzo, P. Picozza, V. Prigiobbe, R. Sparvoli, M. Tirocchi | |
| 155 | 1996-05-30 | Effects of the Gravivector and Graviscalar Fields in N=2,8 Supergravity | 1996 | LNF-96-026(P).pdf | S. Bellucci, V. Faraoni | The available tests of the equivalence principle constrain the mass of the Higgs-like boson appearing in extended supergravity theories. We determine the constraints imposed by high precision experiments on the antigravity fields (gravivector and graviscalar) arising from N=2,8 supergravity. |
| 153 | 1996-05-21 | VME - Real - Time Data Acquisition for the Ultracryogenic Gravitational Antenna of Third Generation | 1996 | LNF-96-024(IR).pdf | G. Mazzitelli | We describe a new design of the front-end electronics for the data acquisition of NAUTILUS, the first ultracryogenic resonant gravitational wave detector, operating in the INFN Laboratori Nazionali di Frascati. The improved sensitivity of this kind of detector poses new requirements on the data acquisition, as more speed, amplitude and timing accuracy are needed. In this work we discuss the results obtained with a new front-end configuration based on VME standard for a data acquisition rate of 5kHz (present rate 220Hz). We also describe the data acquisition system for the cosmic ray telescope assembled around NAUTILUS and the timing system of both the components. |
| 152 | 1996-05-20 | Physics Cahiers - No. 1 | 1996 | LNF-96-023(IR).pdf | S. Bellucci | We begin herewith the editing of physics notes taken in the course of Journal Club seminars at INFN-LNF in 1996. The activity consists of informal talks about work in progress and/or review of (more or less) recent physics results of interest to our laboratory. In the section titles the name of the speakers appear, together with the topics discused in the seminars. We plan to publish these notes twice a year. |
| 151 | 1996-05-16 | X – Ray Magnetic Circular Dichroism at the Iron K Edge in Rare-Earth–Transition-Metal Intermetallics: Experimental Probe of the Rare–Earth Magnetic Moment | 1996 | LNF-96-022(P).pdf | J. Chaboy, H. Maruyama, L. M. García, J. Bartolomé, K. Kobayashi, N. Kawamura, A. Marcelli, L. Bozukov | We present a systematic X-Ray Circular Magnetic Dichroism study performed at the Fe K-edge on the R2Fe14B series (R=rare-earth and Y). The magnetic XCMD signal has been identified as due to the addition of two components associated to the magnetic contributions from the iron and the rare-sublattices. The contribution of the rare-earth sublattice has been extracted from the total XCMD signal. The integrated XCDM signal of the R component is proven to be directly correlated with the R magnetic moment. |
| 4101 | 1996-05-16 | A Measurement of the Solar and Sideral Cosmic Ray Anisotropy at E0~014 eV | 1996 | INFN-AE_96-14.pdf | Navarra EAS-TOP Collaboration | |
| 4102 | 1996-05-16 | Search for Gamma Ray Bursts at Photon Energies E 10 GeV and E 80 TeV | 1996 | INFN-AE_96-15.pdf | Navarra EAS-TOP Collaboration | |
| 4103 | 1996-05-16 | Comparison of the Electron and Muon Data in Extensive Air Showers with the Expectations from a Cosmic Ray Composition and Hadron Interaction Model | 1996 | INFN-AE_96-16.pdf | Navarra EAS-TOP Collaboration | |
| 4100 | 1996-05-15 | High Energy Gamma Rays from Old Accreting Neutron Stars | 1996 | INFN-AE_96-13.pdf | P. Blasi | |
| 4099 | 1996-05-07 | New Developments in Silicon Drift Detectors | 1996 | INFN-AE_96-12.pdf | A. Rashevsky | |
| 4097 | 1996-05-06 | QCD Studies at LEP I | 1996 | INFN-AE_96-10.pdf | G. Raso | |
| 4098 | 1996-05-06 | NOE: Atmospheric and Long Baseline Neutrino Oscillation Experiment | 1996 | INFN-AE_96-11.pdf | G. C. Barbarino, D. Campana, F. Guarino, A. Lauro, G. Osteria, P. Bernardini, G. Mancarella, D. Martello, A. Surdo, S. Bussino, A. Corona, M. De Vincenzi, E. Lamanna, A. Margiotta, M. Spurio, U. Rubizzo, A. Di Credico, A. Grillo, C. Gustavino, S. Mikheyev E. Scapparone | |
| 150 | 1996-05-03 | Lower Scaling Dimensions of Quarks and Gluons and New Energy Scales | 1996 | LNF-96-021(IR).pdf | F. Palumbo | We consider the possibility that quarks and gluons, due to confinement, have lower scaling dimensions. In such a case there appear naturally new energy scales below which the standard theory is recovered. Arguments are given whereby for dimension 1/2 of the quarks the theory is unitary also above these energy scales. |
| 149 | 1996-04-26 | Measurements of Light Yield, Attenuation Lenght and Time Response of Long Samples of 'Blue' Scintillating Fibers | 1996 | LNF-96-020.pdf | A. Antonelli, M. Antonelli, G. Barbiellini, M. Barone, S. Bertolucci, S. Bianco, C. Bini, C. Bloise, V. Bolognesi, F. Bossi, R. Caloi, P. Campana, F. Cervelli, M. Cordelli, G. De Zorzi, G. Di Cosimo, A. Di Domenico, O. Erriquez, F.L. Fabbri, A. Farilla, A. Ferrari, P. Franzini, F. Garufi, P. Gauzzi, E. Gero, S. Giovannella, R. Haydar, M. Incagli, L. Keeble, W. Kim, G. Lanfranchi, J. Lee - Franzini, A. Martini, A. Martinis, S. Miscetti, F. Murtas, A. Parri, A. Passeri, S. Sarwar, F. Scuri, E. Spiriti, L. Tortora, G. Venanzoni, X. L. Wang. S. Wölfle | In connection with the design of the electromagnetic calorimeter of the KLOE detector, we have studied the performance of several samples of commercially available plastic scintillating fibers with a particle beam at the CERN PS. Results on light yield, attenuation length and time resolution measurements concerning 2-4.5m long samples of those fibers are presented. |
| 147 | 1996-04-24 | Eikonalized Mini-Jet Cross-Sections in gg Collisions | 1996 | LNF-96-018(P).pdf | A. Corsetti, R. M. Godbole, G. Pancheri | In this note we asses the validity and uncertainties in the predictions of the eikonalised mini-jet model for sinelgg. We are able to find a choice of parameters where the predictions are compatible with the current data. Even for this restricted range of parameters the predictions at the high c.m. energies, which can be reached at the TeV energy e+e- colliders, differ by about ±25%. LEP 2 data can help pinpoint these parameters and hence reduce the uncertainties in the predictions. |
| 148 | 1996-04-24 | Mini-Jet Total Cross-Sections and Overlap Functions through Bloch-Nordsieck Summation | 1996 | LNF-96-019(P).pdf | A. Corsetti, R. M. Godbole, A. Grau, G. Pancheri, Y.N. Srivastava | Predictions for total inelastic cross-sections for photon induced processes are discussed in the context of the QCD-inspired minijet model. Large theoretical uncertainties exist, some of them related to the parton distributions of hadrons in impact parameter space. A model for such distribution is presented, based on soft gluon summation. This model incorporates (the salient features of distributions obtained from) the intrinsic transverse momentum behaviour of hadrons. Under the assumption that the intrinsic behaviour is dominated by soft gluon emission stimulated by the scatering process, the b-spectrum becomes softer and softer as the scattering energy increases. In minijet models for the inclusive cross-sections, this will counter the increase from sjet. |
| 4143 | 1996-04-24 | La Meccanica della Cavità Ottica del Laser ad Elettroni Liberi sul Linac Superconduttore LISA | 1996 | INFN-TC_96-5.pdf | F. Cevenini, G. Passeggio | |
| 4095 | 1996-04-02 | Beam Optics of the Dirac Particle with Anomalous Magnetic Moment | 1996 | INFN-AE_96-8.pdf | M. Conte, R. Jagannathan, S.A. Khan, M. Pusterla | |
| 4096 | 1996-04-02 | Transverse Spin Effects in Inclusive Hadron-Hadron Interactions | 1996 | INFN-AE_96-9.pdf | A. Bravar | |
| 4094 | 1996-03-26 | Cluster Counting in Helium Based Gas Mixtures | 1996 | INFN-AE_96-7.pdf | G. Cataldi, F. Grancagnolo, S. Spagnolo | |
| 146 | 1996-03-21 | Syncrotron Radiation | 1996 | LNF-96-017.pdf | E. Burattini | No Abstract |
| 4165 | 1996-03-21 | Searching for Neutralinos Using Neutrino Telescopes | 1996 | INFN-TH_96-3.pdf | V. Berezinsky, A.Bottino, J. Ellis, N. Fornengo, G. Mignola, S. Scopef | |
| 145 | 1996-03-20 | Grassmann Scalar Fields and Asymptotic Freedom | 1996 | LNF-96-016(P).pdf | F. Palumbo | We extend previous results about scalar fields whose Fourier components are even elements of a Grassmann algebra with given index of nilpotency. Their main interest in Particle Physics is related to the possibility that they describe fermionic composites analogous to the Cooper pairs of superconductivity. We evaluate the free propagators for arbitrary index of nilpotency and we investigate a F4 model to one loop. Due to the nature of the integral over even Grassmann fields such a model exists for repulsive as well as attractive selfinteraction. In the first case the b-function is equal to that of the ordinary theory, while in the second one the model is asymptotically free. The bare mass has a peculiar dependence on the cutoff, being quadratically decreasing/increasing for attractive/repulsive selfinteraction. |
| 144 | 1996-03-18 | Effects of Higher–Coordination Shells in Garnets Detected by X-Ray-Absorbtion Spectroscopy at the Al K–Edge | 1996 | LNF-96-015(P).pdf | Ziyu Wu, A. Marcelli, A. Mottana, G. Giuli, E. Paris, F. Seifert | The aluminium 1s x–ray–absorptionspectra of a series of garnets, pyrope (Mg3Al2Si3O12), almandine (Fe3Al2Si3O12), spessartine (Mn3Al2Si3O12) and grossular (Ca3Al2Si3O12), are compared to full multiple–scattering calculations using cluster models. An overall good agreement between experiment and calculation, extended also to the edge region, is obtained in the energy range up to 60 eV above the threshold, provided clusters containing at least 40 atoms are used. The analysis of these garnet XAS spectra provides clear evidence on the effect of atoms located far away from the first–coordination shell around the photoabsorber. As a local probe, XANES spectroscopy at the edge of low Z elements appears to be a perfect tool to investigate the role played by atoms located in higher–coordination shells. |
| 142 | 1996-03-15 | Radiative Four-Meson Amplitudes in Chiral Perturbation Theory | 1996 | LNF-96-013(P).pdf | G. D'Ambrosio, G. Ecker, G. Isidori, H. Neufeld | We present a general discussion of radiative four-meson processes to O(p4) in chiral perturbation theory. We propose a definition of “generalized bremsstrahlung” that takes full advantage of experimental information on the corresponding non-radiative process. We also derive general formulae for one-loop amplitudes which can be applied, for instance, to hÆ3pg, ppÆppg and KÆ3pg. |
| 143 | 1996-03-15 | Eigenfrequencies and Quality Factors of Vibration of Aluminium Alloy Spherical Resonators | 1996 | LNF-96-014(P).pdf | E. Coccia, V. Fafone, G. Frossati, E. Ter Haar and M. W. Meisel | We report on the first results of an investigation on the eigenfrequencies and quality factors of vibration of Al 5056 spherical resonators at very low temperatures. In particular the characteristics of the lowest order spheroidal quadrupole mode, relevant for gravitational wave research, were measured. The resonators were suspended at the nodal point. Quality factors up to 1.2 108 were measured in a bulk sample down to 44 mK. Another spherical resonator was obtained by means of explosively-bonded stacks and showed a maximum quality factor of 2 107. The observed quadrupole modes appear to be split into frequency multiplets, because of the broken spherical symmetry, as theoretically predicted. The independence of the modes was measured within one part in 105 in amplitude. |
| 4142 | 1996-03-15 | Sistemi di Montaggio Componibili Modulari - Utilizzazione D'Elementi Flessibili di Montaggio nell'Installazione di Laboratori e/o Esperimenti | 1996 | INFN-TC_96-4.pdf | Andrea Colombo | |
| 4141 | 1996-03-07 | Performance and Simulation of Glass Spark Counter | 1996 | INFN-TC_96-3.pdf | G. Bencivenni, M. De Deo, M. D'Incecco, G. Felici, C. Gustavino | |
| 4092 | 1996-03-07 | Introduction to High Energy Cosmic Ray Physics | 1996 | INFN-AE_96-5.pdf | G. Battistoni, A.F. Grillo | |
| 4091 | 1996-03-06 | Simulation of the DELPHI Stic Silicon Shower Maximum Detector | 1996 | INFN-AE_96-4.pdf | G. Della Ricca, M. Prest | |
| 140 | 1996-03-05 | Deuterium Overloading of Palladium Wires by Means of High Power \\mus Pulsed Electrolysis and Electromigration: Suggestions of a “Phase Transition” and a Related Excess Heat | 1996 | LNF-96-011(P).pdf | F. Celani, A. Spallone, P. Tripodi, A. Petrocchi, D. Di Gioacchino, P. Marini, V. Di Stefano, S. Pace, A. Mancini | We describe a room-temperature hydrogen and deuterium loading of palladium wires by means of pulsed electrolysis and electromigration effect. The D/Pd atomic ratio has been measured by means of the dependence of the resistivity upon the D/Pd ratio. Values of the D/Pd ratio up to 0.95 or even higher have been reached in short times. A correlation between an anomalous temperature rise and resistivity “transition” of the overloaded palladium clearly appears. |
| 141 | 1996-03-05 | Reproducible D/Pd Ratio > 1 and Excess Heat Correlation by 1-ms-Pulse, High-Current Electrolysis | 1996 | LNF-96-012(P).pdf | F. Celani, A. Spallone, P. Tripodi, A. Petrocchi, D. Di Gioacchino, M. Boutet, P. Marini, V. Di Stefano, M. Diociaiuti, W. Collis | A high-current (up to 100A), short-pulse (1-ms duration) electrolysis technique is presented that permits high loading (D/Pd up to 1.2) of deuterium in palladium cathodes. Several different cold-worked palladium plates were used as cathodes, and some underwent surface treatments (oxidation or addition of intermetallic compounds). The surface-treated plates showed atypical deuterium absorption dynamics, and the D/Pd loading ratio exceeded 1. Moreover, during initial loading, these cathodes showed anomalous excess heat (up to 80%) far greater than the absorption enthalpy. The pure palladium surface plates did not show this effect. |
| 139 | 1996-02-27 | Measurement of Cosmic Ray Antiprotons from 3.7 to 19 GeV | 1996 | LNF-96-010(P).pdf | M. Hof, C. Pfeifer, W. Menn, M. Simon, R. L. Golden, S. J. Stochaj, S. A. Stephens, G. Basini, M. Ricci, F. Massimo Brancaccio, P. Papini, S. Piccardi, P. Spillantini, M. P. De Pascale, A. Morselli, P. Picozza, M. T. Brunetti, A. Codino, C. Grimani, M. Menichelli, J. W. Mitchell, J. F. Ormes, R. E. Streitmetter | The antiproton to proton ratio, `p/p, in the cosmic rays has been measured in the energy range from 3.7 to 19 GeV. This measurement was carried out using a baloon-borne superconducting magnetic spectrometer along with a gas Cherenkov counter, an imaging calorimeter and a time of flight scintillator system. The measured `p/p ratio was determined to be 1.24 (+0.68, -0.51) x 10-4. The present result along with other recent observations show that the observed abundances of antiprotons are consistent with models, in which antiprotons are produced as secondaries during the propagation of cosmic rays in the Galaxy. |
| 4130 | 1996-02-27 | Search for h Meson Production in Heavy Ion Collisions at 100 MeV/Nucleon | 1996 | INFN-BE_96-1.pdf | A. Badalà, R. Barbera, A. Palmeri, G.S. Pappalardo, F. Riggi, A.C. Russo, G. Russo, R. Turrisi | |
| 4140 | 1996-02-27 | Multiplexer con Splitter Attivo CAMAC per Controllo Segnali di Fotomoltiplicatore (MU.S.A.C.) | 1996 | INFN-TC_96-2.pdf | M. Sacchetti, G. Antuofermo, G. Iacobelli, P. Vasta | |
| 4163 | 1996-02-22 | Highlights of Astroparticle Physics | 1996 | INFN-TH_96-1.pdf | V. Berezinsky | |
| 4164 | 1996-02-22 | Non-Baryonic Dark Matter | 1996 | INFN-TH_96-2.pdf | V. Berezinsky, A. Bottino, G. Mignola | |
| 137 | 1996-02-14 | KL Interactions and KS Regeneration in KLOE | 1996 | LNF-96-008(IR).pdf | R. Baldini, A. Michetti | K_L total, elastic and K_s regeneration cross sections are evaluated at the K_L momenta from F decay. As far as total and elastic cross sections are concerned the results agree with the available experimental data, at slightly higher momenta. As for K_s regeneration they are rather unexpected, but unfortunately there are no experimental data available to make any check. These cross sections have been compared with the present codes for hadronic interactions in GEANT. Finally evaluations of K_s regeneration and K_L interactions on the defferent parts of the KLOE detector are reported. |
| 138 | 1996-02-14 | Performance of Fine Mesh Photomultiplier Tubes in Magnetic Fields up to 0.3 T | 1996 | LNF-96-009.pdf | A. Antonelli, M. Antonelli, G. Barbiellini, M. Barone, S. Bertolucci, C. Bini, C. Bloise, F. Bossi, R. Caloi, P. Campana, F. Cervelli, M Cordelli, G. De Zorzi, G. De Cosimo, A. Di Domenico, O. Erriquez, A. Farilla, A, Ferrari, P. Franzini, F. Garufi, P. Gauzzi, S. Giovannella, M. Incagli, L. Keeble, W. Kim, G. Lanfranchi, J. Lee-Franzini, A. Martinis, S. Miscetti, F. Murtas, A. Passeri, F. Scuri, E. Spiriti, L. Tortora, G. Venanzoni, S. Wölfe | We have studied the performance of fine mesh photomultiplier tubes (R2490-05, R2021, H5756, R3423-01) in magnetic fields up to 0.3T. The tube gain and the average number of photoelectrons have been measured as a function of the magnetic field, of the angle between the field direction and the phototube axis, and of the rotation of the phototube around its axis. The reduction of the photocathode effective area in a magnetic field has also been measured. |
| 4090 | 1996-02-12 | Characterization of Large Series of Double Sided Silicon Microstrip Detectors | 1996 | INFN-AE_96-3.pdf | M. Caria, E. Fiandini | |
| 136 | 1996-02-09 | Bloch– Nordsieck Summation and Partonic Distributions in Impact Parameter Space | 1996 | LNF-96-007(P).pdf | A. Corsetti, A. Grau, G. Pancheri, Y. N. Srivastava | A model for the parton distributions of hadrons in impact parameter space has been constructed using soft gluon summation. This model incorporates the salient features of distributions obtained from the intrinsic transverse momentum behaviour of hadrons. Under the assumption that the intrinsic behaviour is dominated by soft gluon emission stimulated by the scattering process, the b-spectrum becomes softer and softer as the scattering energy inreases. In minijet models for the inclusive cross-sections, this will counter the increase from sjet . |
| 4089 | 1996-02-07 | The Cosmic Ray Positron to Electron Ratio in the Energy Range 0.85 to 14 GeV | 1996 | INFN-AE_96-2.pdf | G. Barbiellini et al. | |
| 135 | 1996-02-06 | UNIX at LNF - User Guide Versione 2.0 | 1996 | LNF-96-006(NT).pdf | M. Carboni | This user’s guide describe the UNIX configuration available at LNF, introduced as a central facilities since December 1992. The original configuration was besed only on HP 9000/7XX with HP-UX Operating System, now the new Digital with operating system DEC-OSF/1 are also included. Presently the LNF UNIX configuration is based on 11 Hewlett Packard Workstation with Batch Server functionality, one HP 9000/755 with 128MB of Memory dedicated for INTERACTIVE use. Since June 1995 the Computing Service also support the DEC system with the new Alpha Processor and DEC-OSF/1 Operating System, this systems can be used for intensive I/O tasks, like data analysis. This guide gives an overview of the LNF UNIX service and describes the procedure for job submission using Network Queueing System, NQS. More detailed description of the local commands are given in the online man pages. In addition, up to now only for HP-UX, a complete set of manuals is available on line via Irom command, which accesses a CDROM over the network. |
| 134 | 1996-02-05 | Theoretical Analysis of X-Ray-Absorption spectra at the Silicon K an L2,3 Edges of Crystalline and Amorphous SiO2 | 1996 | LNF-96-005.pdf | J. Chaboy, M. Benfatto, I. Davoli | In this work we present the analysis of the x-ray-absorption spectra at the silicon L2,3 and K edges in amorphous SiO2 and a quartz. This analysis consists in the comparison between experimental data and several calculations based on multiple scattering theory. An extensive discussion is presented concerning the role of the final state potential needed to reproduce the experimental data. In paticular, the effects of the cluster-size, exchange-correlation potential and the role played by self-consistent-field potential are discussed. The remarkable agreement between the theoretical computations and the experimental data allows us to identify the origin of the different features in the x-ray-absorption near-edge structure spectra. |
| 133 | 1996-02-04 | Time Evolution of K0 – anti K0, System in Spectral Formulation | 1996 | LNF-96-004(P).pdf | M. Nowakowski | We reanalyse the time evolution of the K0 -`K0 system in the language of certain spectral function whose Fourier transforms give the time dependent survival and transition amplitudes. Approximating the spectral function by an one-pole ansatz we give insight into the limitation of the validity of one-pole approximation, not only for small/large time scales, but also for intermediate times where new effects, albeit small, are possible. It will be shown that the same validity restriction apply to the known formulae of Weisskopf-Wigner approximation as well. The present analysis can also be applied to the effect of vacuum regeneration of KL and KS, a possibility pointed out by Khalfin. As a result of this possible new contributions to the well known oscillatory terms will enter the time depend transition probanilities. These new terms are not associated with small/large time behaviour of the amplitudes and therefore their magnitude is apriori unknown. It will be shown that the order of magnitude of this new effect is very small and, in principle, its exact determination lies outside the scope of one-pole ansatz. |
| 132 | 1996-01-30 | The KLOE Drift Chamber | 1996 | LNF-96-003.pdf | A. Calcaterra - for the KLOE Collaboration | The KLOE drift chamber is a cylinder of ~2m radius and ~3.3m long, providing an adequate path for KL decays. The tracking volume is surrounded by a 15X0 em calorimeter and a superconducting coil providing a 0.6T field. Spherical end walls hold the tension of ~50000 wires, with good trasparency, Š0.1X0, to photons from p0 decays. Alternating stereo wires only, with constant radial displacement at the center, provide a uniform filling with approximately square cells. A He-iC4H10 gas mixture and Al field wires are used to minimize multiple scattering. The chamber point resolution in r, f is significantly better than 200mm resulting in a KLÆp+p- vertex accuracy of sx,y(z)Š0.5(1-2)mm. The K0 mass resolution is sM~1MeV/c2. |
| 4139 | 1996-01-25 | A 3.9 K Transition Edge Particle Detector with Dc-SQUID Read-Out and Temperature Stabilization | 1996 | INFN-TC_96-1.pdf | F. Gatti, P. Meunier | |
| 4088 | 1996-01-16 | The Use of Two Simultaneous Coordinates in a Silicon Microstrip Detector | 1996 | INFN-AE_96-1.pdf | Mario Caria | |
| 131 | 1996-01-11 | Physics at DAPHNE | 1996 | LNF-96-002(P).pdf | Paula Franzini, J. Lee - Franzini et al. | A new machine at Frascati will let us observe unique interference patterns typical of quantum mechanical systems. |
| 130 | 1996-01-08 | Detection of Impulsive. Monochromatic and Stochastic Gravitational Waves With Resonant Antennas | 1996 | LNF-96-001(IR).pdf | P. Astone, G.V. Pallottino, G. Pizzella | The sensitivity of a gravitational wave resonant detector for various types of waves is given in terms of the detector noise spectrum Sh(w). It is shown that for g.w. short bursts the sensitivity is determined by Sh(w)/dn, where dn is the detector bandwidth that depends strongly on the electromechanical transducer and associated electronics. The sensitivity for a g.w. stochastic background depends, at the detector resonance, only on Sh(w) that, in turns, for a given material, depends essentially on T/MQ, where T is the bar temperature, M is the bar mass and Q the merit factor. Thus a non sophisticated transducer with a bandwidth of a few Hz appears sufficient for measuring, at a particular frequency, the g.w. background. It is shown that the very nature of a resonant bar gives a good sensitivity at the resonance. A bar with M=2300 kg, Q=5 106, T=0.1 K and dn=0.9 Hz can detect a g.w. background with amplitude 7 10-23/*Hz. Cross-correlating for one hundred days two identical detectors installed in the same location, the sensitivity improves to 1.3 10-24/*Hz. |
| 4087 | 1995-12-22 | SNI: a New Mechanism for Gamma Ray Burst. I. Weak Magnetic Field | 1995 | INFN-TH_95-1.pdf | V. Berezinsky, P. Blasi, B.I. Hnatyk | |
| 4048 | 1995-12-22 | Measurement of the Positron to Electron Ratio in the Cosmic Rays Above 5 GeV | 1995 | INFN-AE_95-22.pdf | A. Vacchi, G. Barbiellini et al. | |
| 4049 | 1995-12-22 | Front-End Electronics - An Overview | 1995 | INFN-AE_95-23.pdf | D.V. Camin | |
| 4050 | 1995-12-22 | Searching for a Neutrino Magnetic Moment with an Artificial Source and Nal(TI) Scintillators deep underground | 1995 | INFN-AE_95-24.pdf | I.R. Barabanov, P. Belli. R. Barnabei et al. | |
| 269 | 1995-12-11 | Sensitivity Limits of a Capacitive Transducer for Gravitational Wave Resonant Antennas | 1995 | LNF-95-064(P).pdf | M. Bassan, G. Pizzella | We analyze the performance of a resonant gravitational wave antenna equipped with a resonant, d.c. biased capacitive transducer, an untuned superconducting matching circuit and a d.c. Squid. We derive simple relations for the detector energy sensitivity that serve as guidelines for device development and we show that, with reasonable improvements in Squid technology, an effective temperature for burst detection of 2 \\muK can be achieved. |
| 270 | 1995-12-11 | On the Extension of the Fermi-Watson Theorem on High Energy Diffraction | 1995 | LNF-95-065(IR).pdf | A. Malecki | The Fermi-Watson theorem, established for low energy reactions and then applied to high energy collisions, is revisited. Its use for the processes of inelastic diffraction is discussed. The theorem turns out to be valid in the case of inclusive cross-section of diffractive transictions. |
| 268 | 1995-12-07 | Mode Analysis of Laser-Interferometric Gravitational Wave Detectors | 1995 | LNF-95-063(IR).pdf | D. Babusci, H. Fang, G. Giordano, G. Matone, L. Matone, V. Sannibale | A mode analysis of the VIRGO gravitational wave detector is presented. The dark fringe condition and the background at the detector have been examined. The plane-parallel and the plano-concave configurations for the recycling cavities have been compared. No substantial differences have been envisaged. |
| 4047 | 1995-12-05 | B Physics from Delphi at LEP | 1995 | INFN-AE_95-21.pdf | Carlo Caso | |
| 266 | 1995-12-04 | Charm Lifetimes and Semileptonic Decays | 1995 | LNF-95-061(P).pdf | S. Bianco | The study of lifetimes and semileptonic (SL) decays of charmed mesons and baryons is currently the goal of several experiments all around the world. \\tau = h/(\\Gamma + \\GammaSL + \\Gamma nonleptonic) This paper is focussed on giving an overview of current status and open questions, and on reviewing new results by E687 and CLEO presented as contributed papers at this Conference. A wealth of detailed reviews exists on both charm lifetimes [5]-[2] and SL decays [3]-[4]-[1], some very up to date, which the reader can refer to for details. |
| 4054 | 1995-11-23 | (Æp, a) Reactions on Odd-Mass Target Nuclei | 1995 | INFN-BE_95-4.pdf | P. Guazzoni, G. Cata-Danil, G. Graw, J.Gu, R Hertenberger, M. Jaskola, P. Schiemenz, G. Staudt, A. Vitturi, L. Zetta | |
| 264 | 1995-11-21 | Large-p | Heavy-Quark Production in Two-Photon Collisions | 1995 | LNF-95-059(P).pdf | M. Cacciari, M. Greco, B. A. Kniehl, M. Kramer, G. Kramer, M. Spira | The next-to-leading-order (NLO) cross section for the production of heavy quarks at large trans verse momenta (p\\perp) in \\gamma\\gamma collitions is calculated with perturbative fragmentation functions (PFF). This approach allows for a resummation of terms \\alpha \\alpha_3 ln(p^2\\perp/m^2) which arise in NLO from collinear emission of gluons by a heavy quark at large p\\perp or from almost collinear branching of photons or gluons into heavy-quark pairs. We present single-inclusive distributions in p\\perp and rapidity including direct and resolved photons for \\gamma\\gamma production of heavy quarks at e+ e- colliders and at high energy \\gamma\\gamma colliders. The results are compared with the fixed-order calculation for m finite including QCD radiative corrections. The two approaches differ in the definitions and relative contributions of the direct and resolved terms, but essentially agree in their sum. The resummation of the \\alpha_2 ln(p^2\\perp/m^2) terms in the PFF approach leads to a softer p\\perp distribution and to a reduced sensitivity to the choice of the renormalization and factorization scales. |
| 265 | 1995-11-21 | Photon Polarization Properties in Laser Backscattering | 1995 | LNF-95-060.pdf | D. Babusci, G. Giordano, G. Matone | In this paper we present the full calculation of the final photon polarization in the Compton scattering on electron \\gamma + e \\rightarrow \\gamma + e. We claim to be in disagreement with some of the results quoted by F.R. Arutyunian and V.A. Tumanian in Sov. Phys. Usp. 83 (1964) 339; Phys. Lett. 4 (1963) 177. |
| 4046 | 1995-11-14 | Vacuum Polarisation in Some Statistic Nonuniform Magnetic Fields | 1995 | INFN-AE_95-20.pdf | Giorgio Calucci | |
| 262 | 1995-11-10 | Resonant Detectors for Gravitational Waves | 1995 | LNF-95-057(P).pdf | G. Pizzella | The principles of the gravitational wave detection by means of resonant antennas are illustrated and a review of the resonant antenna experiments in the world is given. Possible plans for the future resonant antennas are indicated. |
| 263 | 1995-11-10 | Polarised and Tagged Gamma-Ray Ladon Beams | 1995 | LNF-95-058(P).pdf | D. Babusci, M. Capogni, L. Casano, A. D' angelo, F. Ghio, B. Girolami, L. Hu , D. Moricciani, C. Shaerf | The production of polarized and tagged gamma-ray beams by the backscattering of Laser light on the relativistic electrons circulating in storage rings is discussed. The main characteristic and the experimental results of the Ladon and LEGS beams are presented. The Graal beam is introduced. |
| 261 | 1995-11-02 | An Introduction to the Vector Meson | 1995 | LNF-95-056(P).pdf | F. Nichitiu | In the present paper we survey the present status of the experimental knowledge on the vector mesons built from light quarks. |
| 260 | 1995-10-25 | The DEAR Proposal DAFNE Exotic Atom Research | 1995 | LNF-95-055(IR).pdf | R. Baldini, S. Bianco, F. L. Fabbri, C. Guaraldo, V. Lucherini, C. Petrascu, A. Vacchi, E. Zavattini, A. Bragadireanu, M. Iliescu, T. Ponta, V. Zoran, R. Jacot - Guillarmod, F. Mulhauser, L. A. Schaller, L. Schellenberg, H. Schneuwly, M. A. Augsburger, D. Chatellard, J.- P. Egger, E. Jeannet, D. Varidel, R. S. Hayano, M. Hori, T. M. Ito, M. Iwasaki, S. N. Nakamura, G. Beer, T. Koike, Y. Akaishi | FIRST PREFACE - 'The most important experiment to be carried out in low energy K-meson physics today is the definitive determination of the energy level shift in the K-p atoms, because of their direct connection with the physics of KN interaction and their complete independence from all other kinds of measurements which bear on this interaction'. |
| 4086 | 1995-10-20 | Capacitance of the Circular Patch Resonator | 1995 | INFN-TC_95-31.pdf | G. Mianno, G. Panariello, V.G. Vaccaro, L. Verolino | |
| 259 | 1995-10-16 | CP and Rare Decays | 1995 | LNF-95-054(P).pdf | P. Franzini | CP violation experiments, new measurements of the parameters of the neutral K system and searches for rare decays are summarized. Perspectives for the near future are presented. |
| 4045 | 1995-10-12 | Perspectives in High Energy Phyisics Instrumentation | 1995 | INFN-AE_95-19.pdf | L. Rossi | |
| 4084 | 1995-10-12 | Some integral formulations Occurring in Accelerator Physics | 1995 | INFN-TC_95-29.pdf | G. Miano, L. Verolino, V.G. Vaccaro | |
| 4085 | 1995-10-12 | Caratterizzazione di un Fotomoltiplicatore Attraverso la Misura del Picco di Singolo Fotoelettrone | 1995 | INFN-TC_95-30.pdf | R. Perrino, A. Leone | |
| 256 | 1995-09-28 | MASS-Wizar | 1995 | LNF-95-051(R).pdf | Mass - Wizar Collaboration | A measurement of the cosmic ray muon flux in the atmosphere has been carried out from the data collected by the MASS2 (Matter Antimatter Sprectrometer System) apparatus during the ascent of the 1991 flight. The experiment was performed on September 23, 1991 from Fort Sumner, New Mexico (USA) at a geomagnetic cutoff of about 4,5 CV/c. The negative muon spectrum has been determined in different depth ranges in the momentum interval 0,33-40 GeV/c with higher statistics and better background rejection than reported before. Taking advantage of the high geomagnetic cutoff and the high performances of the instrument, the positive muon spectrum has also been determined and the altitude dependence of the muon charge ratio has been investigated in the 0,33-1,5 GeV/c momentum range. |
| 257 | 1995-09-28 | The WiZard/CAPRICE Silicon-Tungsten Calorimeter | 1995 | LNF-95-052(P).pdf | M. Bocciolini, F. Celletti, N. Finetti, M. Grandi, P. Papini, A. Perego, S. Piccardi, P. Spillantini, V. Bidoli, M. Candusso, M. Casolino, M. P. De Pascale, A. Morselli, P. Picozza, R. Sparvoli, G. Basini, G. Mazzenga, M. Ricci, F. Bronzini, G. Barbiellini, M. Boezio, V. Bravar, F. Fratnik, P. Schiavon, A. Vacchi, N. Zampa | A silicon-tungsten calorimeter has been developed to be flown in the Wizard/CAPRICE balloon borne experiment to measure the flux of antiprotons, positrons and light nuclei in the cosmic radiation. The calorimeter is composed of 8 x, y silicon sampling planes [active area (48 x 48) cm^2} interleaved with 7 tungsten absorbers (7 radiation lengths); it provides the topology of the interacting events together with an independent measurement of the deposited energy. Details of the front -end electronics and the read-out system are given and the overall performances during pre-flight ground operations are described as well. |
| 258 | 1995-09-28 | Total Hadronic Photoabsorption Cross Section on Nuclei in the Nucleon Resonance Region | 1995 | LNF-95-053(P).pdf | N. Bianchi, V. Muccifora, E. De Sanctis, A. Fantoni, P. Levi Sandri, E. Polli, A. R. Reolon, P. Rossi, M. Anghinolfi, P. Corvisiero, M. Ripani, M. Sanzone, M. Taiuti, A. Zucchiatti | The total absorption cross section for 7Li, C, Al, Cu, Sn, Pb has been measured in the energy range 300\\div1200 MeV at Frascati with the Jet-Target tagged photon beam. A 4\\pi NaI crystal detector and a lead-grass shower counter were used respectively to measure hadronic events and to reject the electromagnetic background. Data above 600 MeV clearly indicate a spreading out of higher nucleon resonance peaks in nuclei and a reduction of the absolute value of the cross section per nucleon respect to the free nucleon case. This large broadening of higher nucleon resonances suggests a strong influence of the nuclear medium in their propagation and interaction mechanisms, while the systematic reduction of the measured cross sections might be due to a damping of the resonance excitation strength and to the onset of shadowing effect around 1 GeV. Moreover our systematic study indicates that also the \\bigtriangleup-resonance excitation parameters are not the same for all the nuclei, being its mass and width increasing with the nuclear density. |
| 4083 | 1995-09-27 | A 250 Msps CAMC Data Acquisition System | 1995 | INFN-TC_95-28.pdf | G.F. Palamà, A.C. Neve | |
| 4081 | 1995-09-15 | Il Controllo Automatico del Sistema Ottico di Lettura del Calorimetro a Grande Angolo per CLAS | 1995 | INFN-TC_95-26.pdf | A. Cassotana, P. Domenichini, M. Anghinolfi, M. Battaglieri, P. Cocconi, A. Longhi, F. Parodi, M. Ripani, A. Rottura, M. Taiuti | |
| 4082 | 1995-09-15 | Simulating Capacitive Cross-Talk Effects in DC-Coupled Hybrid Silicon Pixel Detectors | 1995 | INFN-TC_95-27.pdf | V. Bonvicini, M. Pindo | |
| 4080 | 1995-09-13 | Preliminary Proposal of a Nb3Sn Quadrupole Model for the lowB Insertions of the LHC | 1995 | INFN-TC_95-25.pdf | G. Ambrosio, F. Ametrano, G. Bellomo, F. Broggi, L. Rossi, G. Volpini | |
| 255 | 1995-09-11 | Quasi–Elastic Scattering in the Inclusive (3He, t) Reaction | 1995 | LNF-95-050(P).pdf | N. G. Kelkar, B. K. Jain | The triton energy spectra of the charge-exchange 12C(3He,t) reaction at 2 GeV beam energy are analyzed in the quasi-elastic nucleon knock-out region. Considering that this region is mainly populated by the charge-exchange of a proton in 3He with a neutron in the target nucleus and the final proton going in the continuum, the cross-section are written in the distorted-wave impulse approximation. the t-matrix for the elementary exchange process is constructed in the DWBA, using one pion-plus rho-exchange potential for the spin-isospin nucleon-nucleon potential. This t-matrix reproduces the experimental data on the elementary pn\\rightarrow np process. The calculated cross-sections for the 12C(3He,t) reaction at 2^ to 7^ triton emission angle are compared with the corresponding experimental data, and are found in reasonable overall accord. |
| 252 | 1995-09-06 | Measurement of the Total e+e– Hadrons Cross Section Near the e+e- `N`N Threshold | 1995 | LNF-95-047(P).pdf | A. Antonelli, R. Baldini, M. Bertani, M.E. Biagini, V. Bidoli, C. Bini, T. Bressani, L. Calabrese, R. Cardarelli, R. Carlin , C. Casari, L. Cugusi, P. Dalpiaz, A. De Falco, G. De Zorzi, A. Feliciello, M.L. Ferrer, P. Ferretti, P. Gauzzi, P. Gianotti, E. Luppi, S. Marcello, A. Masoni, R. Messi, M. Morandin, L. Paoluzi, F. Pasqualucci, G. Pauli, N. Perlotto, F. Petrucci, M. Posocco, M. Preger, G. Puddu, M. Reale, L. Santi, R. Santonico, P. Sartori, M. Savriè, S. Serci, M. Spinetti, S. Tessaro, B. Voci, F. Zuin | A new measurement of the total e+ e- \\rightarrow hadrons cross-section in the centre of mass energy range 1,8-2,5 GeV, performed by the FENICE experiment at the Frascati e+ e- storage ring ADONE, is presented. The behaviour of the total cross section together with the proton electromagnetic time-like form factor is discussed in terms of a narrow vector resonance close to the nucleon-antinucleon threshold. |
| 253 | 1995-09-06 | Null Fields Realizations of W3 From W(sl(4), sl(3)) and W(sl(3|1), sl(3)) Algebras | 1995 | LNF-95-048(P).pdf | S. Bellucci, S. Krivonos, A. Sorin | We consider the nonlinear algebras W(sl(4), sl(3)) and W(sl(3\\mid1),sl(3)) and find their realizations in terms of currents spanning conformal linearizing algebras. The specific structure of these algebras, allows us to construct realizations modulo null fields of the W3 algebra that lies in the cosets W(sl(4),sl(3))/u(1) and W(sl(3\\mid1),sl(3))/u(1). Such realizations exist for the following values of the W3 algebra central charge: cw =-30, -40/7, -98/5, -2. The first two values are listed for the first time, whereas for the remaining values we get the new realizations in terms of an arbitrary stress tensor and u(1) x sl(2) affine currents. |
| 254 | 1995-09-06 | Critical Behaviour of the Schwinger Model with Wilson Fermions | 1995 | LNF-95-049(P).pdf | V. Azcoiti, G. Di Carlo, A. Galante, A. F. Grillo, V. Laliena | We present a detailed analysis, in the framework of the MFA approach, of the critical behaviour of the lattice Schwinger model with Wilson fermions on lattices up to 24^2, through the study of the Lee-Yang zeros and the specific heat. We find compelling evidence for a critical line ending at k = 0,25 at large \\beta. Finite size scalintg analysis on lattices 8^2, 12^2, 16^2, 20^2 and 24^2 indicates a continuous transition. The hyperscaling relation is verified in the explored \\beta region. |
| 251 | 1995-08-31 | Identification of Cosmic Ray Electrons and Positrons by Neural Networks | 1995 | LNF-95-046(P).pdf | F. Aversa, G. Barbiellini, G. Basini, R. Bellotti, V. Bidoli, M. Bocciolini, U. Bravar, M. Boezio, F. Cafagna, M. Candusso, M. Casolino, M. Castellano, M. Circella, A. Colavita, G. De Cataldo, C. De Marzo, M. P. De Pascale, N. Finetti, F. Fratnik, N. Giglietto, R.L. Golden, C. Grimani, M. Hof, B. Marangelli, F. Massimo Brancaccio, W. Menn, J. W. Mitchell, A. Morselli, P. Papini, A. Perego, S. Piccardi, P. Picozza, A. Rainò, M. Ricci, P. Schiavon, M. Simon, R. Sparvoli, P. Spillantini, P. Spinelli, S. A. Stephens, S. J. Stochaj, R. E. Streitmatter, A. Vacchi, N. Zampa | A data analysis based on artificial neural network classifiers has been done to identify cosmic ray electrons and positrons detected with the balloon-borne NMSU/Wizard-TS93 experiment. The information is provided by two ancillary and independent particle detectors: a transition radiation detector and a silicon-tungsten imaging calorimeter. Electrons and positrons measured during the flight have been identified with background rejection factors of 80+ - 3 and 500 + - 37 at signal efficiencies of 72 + - 3% and 86 + - 2% for the transition radiation detector and the silicon-tungsten imaging calorimeter, respectively. The ability of the atrificial neural network classifiers to perform a careful multidimensional analysis surpassed the results achieved by conventional methods. |
| 249 | 1995-08-28 | The Effect of Hydrogen Absorption on the Structural, Electronic and Magnetic Properties of the C15 Friauf-Laves Phase Compounds CeFe2, CeRu2 and LaRu2 : an X-Ray Absorption Spectroscopy (XAS) Study | 1995 | LNF-95-044(P).pdf | J. Chaboy, J. Garcia, A. Marcelli | We present an x-ray absorption spectroscopy (XAS) investigation of the structural changes occurred upon hydriding in the Friauf-laves phase compounds CeFe2, CeRu2 and LaRu2 compounds. The analysis of the extended x-ray absorption spectroscopy (EXAFS) spectra at the L-edges of the rare-earth and at the Fe K-edge indicates that the hydrogenation process leads to the suppression of the long-range crystalline order in all the hydride derivatives investigated, as well as the different influence of H2 in both the rare earth and transition metal sublattices. The correlation between the structural and magnetic changes introduced by the hydrogen in the host matrix is discussed in terms of the modification of the electronic properties, i.e., intermediate-valence state of Ce, and of the hybridization between the transition metal and the rare-earth. |
| 250 | 1995-08-28 | Nota Tecnica sull'Utilizzo dei P. C. in Ambito INFN | 1995 | LNF-95-045(NT).pdf | D. Salomoni, S. Zani, O. Ciaffoni, L. Trasatti, A. Donati, P. Guida, R. Gomezel, C. Allocchio | Scopo di questa nota tecnica e' quello di focalizzare le problematiche relative all'uso dei Personal Computers nei nostri Laboratori e Sezioni* proponendo alcune soluzioni in merito. I temi affrontati in maniera volutamente schematica riguardano, cablaggi e tipologie di rete, strumenti di management, configurazioni di rete a livello geografico, servizi di rete, office automation e acquisizione dati. *L'ultimo censimento effettuato nell'estate - autunno del 1993 riportava una presenza nel nostro Istituto di circa 1100 PC di tipo Macintosh e 600 PC tipo IBM compatibili. |
| 4079 | 1995-08-28 | Introduzione a SEMINAR & PSTricks Due Stili Latex per Lucidi e Grafica Postscript | 1995 | INFN-TC_95-24.pdf | S. Ansoldi | |
| 4078 | 1995-08-23 | Thermal Conductivity Measurements at Cryogenic Temperature at LASA | 1995 | INFN-TC_95-23.pdf | F. Broggi, D. Padrini, L. Ross | |
| 4077 | 1995-08-09 | Una Macchina Automatica per la Produzione degli Elettrodi del Calorimetro a Kliptron Liquido dell'Esperimento NA48 | 1995 | INFN-TC_95-22.pdf | V. Carassini | |
| 4076 | 1995-08-04 | The Schrodinger Equation with Electromagnetic Potentials in the Framework of Stochastic Quantization Approach | 1995 | INFN-TC_95-21.pdf | S.I. Tzenov | |
| 240 | 1995-07-31 | Effects of Cosmic-Ray-Induced Casacades on the Ultracryogenic Antenna NAUTILUS | 1995 | LNF-95-035(P).pdf | P. Astone, M. Bassan, P. Bonifazi, P. Carelli, C. Cosmelli, E. Coccia, D. Castellazzi, V. Fafone, S. Frasca, A. Marini, G. Mazzitelli, I. Modena, G. Modestino, A. Moleti, G. V. Pallottino, M. A. Papa, G. Pizzella, P. Rapagnani, F. Ricci, F. Ronga, R. Terenzi, M. Visco, L. Votano | The gravitation wave antenna NAUTILUS has been provided with a cosmic-ray veto system. The espected number of events from the interactions of high-energy hadrons and muons and multihadron showers with the antenna are shown together with examples from the data analysis of the search for coincidences between the two detectors. |
| 241 | 1995-07-31 | Multiwire Drift Tubes with Jet-Cell Geometry for Muon Detection at LHC | 1995 | LNF-95-036.pdf | P. Bagnaia, E. Barberio, H. Beker, H. Bilokon, A. Borisov, N. Bozhko, V. Chiarella, G. Ciappetti, M. Curatolo, M. Dris, B. Esposito, C. W. Fabjan, T. Filippas, A. Franz, E. Gazis, B. Goret, V. Goryatchev, M. Kirsanov, W. Klempt, T. Kobayashi, A. Kojine, S. Komamiya, D. Liguori, T. Mashimo, A. Nisati, L. Pontecorvo, E. Rosso, Y. Salomatin, M. Schioppa, G. Susinno, G. Tentori, A. Teodoli, V. Tumakov, M. Valdata, G. Viehhauser, A. S. Vovenko | Recent results from test measurements with cosmic rays of jet-cell chamber prototypes, developed and studied for the \\mu detector of the ATLAS apparatus, are reported. |
| 242 | 1995-07-31 | The KLOE Electromagnetic Calorimeter | 1995 | LNF-95-037.pdf | J. L. Franzini, A. Antonelli, M. Antonelli, G. Barbiellini, M. Barone, S. Bertolucci, C. Bini, C. Bloise, V. Bolognesi, F. Bossi, P. Campana, F. Cervelli, R. Caloi, M. Cordelli, G. De Zorzi, G. Di Cosimo, A. Di Domenico, O. Erriquez, A. Farilla, A. Ferrari, P. Franzini, F. Garuffi, P. Gauzzi, E. Gero, S. Giovannella, R. Haydar, M. Incagli, L. Kleebe, W. Kim, G. Lanfranchi, A. Martini, A. Martinis, S. Miscetti, F. Murtas, A. Parri, A. Passeri, F. Scuri, E. Spiriti, L. Tortora, X.L. Wang, S. Wolfe | A general purpose detector, KLOE, is under construction for operations at the Frascati \\phi factory, DAPHNE. Its central mission is the study of direct CP violation in K0 decays, which places very stringent requirements on electomagnetic shower measurements in the 20-280 MeV/c region. We have chosen to use a lead-scintillator sampling calorimeter, EmC, consisting of very thin (0,5 mm) lead layers in which are embedded 1 mm diameter scintillating fibers. Much prototyping and testing has been done during its design, Yelding, for the final EmC, an expected energy resolution of \\sigma(E)/E \\sim 4,4% \\sqrt{E(GeV)} and a time resolution of \\sim 46 ps / \\sqrt {E(GeV)}, with excellent linearity in the region of interest and with little dependance on incidence angle and entry position. |
| 244 | 1995-07-31 | On the Analytical Solution of the Inverse Diffraction Transform Kernel | 1995 | LNF-95-039(P).pdf | M. Pallotta | In diffraction tomography, optical information processing and, more generally, Fourier optics, the diffraction transform solves both the direct and the inverse boundary value propagation problem for the Helmholtz equation. Its kernel is itself an integral. It is presented an analytical solution. |
| 245 | 1995-07-31 | Local Structure and Size Effects in Nanophase Palladium: An X-Ray Absorption Study | 1995 | LNF-95-040.pdf | S. De Panfilis, F. D' Acapito, V. Haas, H. Konrad, J. Weissmüller, F. Boscherini | The connection between local structure and the grain size distribution in nanophase palladium is studied by X-ray absorption spectroscopy (XAFS) and X-ray diffraction. XAFS shows that there is a reduced average coordination number in all samples; this reduction is compatible with a size effect, contradicting previous XAFS measurements. |
| 246 | 1995-07-31 | Collective Effects and Impedance Study for the DAFNE PHI-Factory | 1995 | LNF-95-041(P).pdf | M. Zobov, P. Arcioni, R. Boni, A. Gallo, A. Ghigo, F. Marcellini, M. Migliorati, L. Palumbo, L. Pellegrini, M. Serio, B. Spataro | We describe the design of main impedance generating elements of DAPHNE vacuum chamber and discuss the impact of these elements on single and multibunch beam dynamics. |
| 247 | 1995-07-31 | Numerical Simulation of Deuterium Loading Profile in Palladium and Palladium Alloy Plates from Experimental Data of Absorbed Mole Rate Obtained Using ms Pulsed Electrolysis | 1995 | LNF-95-042(R).pdf | F. Celani, A. Petrocchi, P. Tripodi, A. Spallone, D. Di Gioacchino, M. Nakamura, P. Marini, V. Di Stefano, G. Preparata, M. Verpelli | Different kinds of palladium plates have been used as cathodes in pulsed electrolysis to study the influence of metallurgy and surface treatment on deuterium loading value. We calculated local deuterium concentration by mean of the diffusion equation, using for its boundary conditions experimental data of absorption rate [1]. For the diffusion coefficient of the deuterium in metals (\\alpha, \\beta and \\gamma phase), depending on the local concentration ratio D/M, we have used experimental values [2]. The highest concentration gradient was found in the case of oxidized palladium sample. |
| 248 | 1995-07-31 | Study of Deuterium Charging Behaviour in Palladium and Palladium Alloy Plates, Changing Surface Treatments, by ms Pulsed Electrolysis | 1995 | LNF-95-043(P).pdf | F. Celani, A. Petrocchi, P. Tripodi, A. Spallone, D. Di Gioacchino, P. Marini, V. Di Stefano, M. Diociaiuti, A. Mancini | A systematic study about deuterium loading in palladium has been performed. Palladium cold worked plates and palladium alloy plates have been used as comparison. A proper plate surface oxidation has been performed and anomalous absorption rates have been measured. A high peak current (15 A), short width pulse (duration 1\\mu s) electrolysis technique has been used to test all chatode plates and it is visible that this technique permits to reach very high D/Pd loading values (around 1/1 or even more for palladium). At the beginning of the loading, in close relation with the anomalous absorption rate, a bump of excess heat has been measured in two similar oxidized surface palladium plates.All these tests show that the loading is completely reproducible. |
| 4044 | 1995-07-26 | Spin and Madelüng Fluid | 1995 | INFN-AE_95-18.pdf | G. Salesi | |
| 243 | 1995-07-20 | Calculation of the TeV Prompt Muon Component in Very High Energy Cosmic Ray Showers | 1995 | LNF-95-038(P).pdf | G. Battistoni, C. Bloise, C. Forti, M. Greco, J. Ranft, A. Tanzini | HEMAS-DPM is a Monte Carlo for the simulation of very high energy cosmic ray showers, which includes the DPMJET-II code based on the two component Dual Parton Model. DPMJET-II provides also charm production in agreement with data and, for p\\perp exceeding 5 GeV/c, with perturbative QCD results in hadron-nucleos and nucleos-nucleos interactions. In this respect, a new scheme has been considered for the inclusive production of D mesons at large p\\perp in hadronic collitions in the framework of perturbative fragmentation functions, allowing an analysis at the Next to Leading Order (NLO) level which goes beyond the fixed O(\\alpha3s) perturbative theory of open charm production. We have applied HEMAS-DPM to the calculation of the prompt muon component for E\\mu >= 1 TeV in air showers considering the two extreme cases of primary protons and Fe nuclei. |
| 4075 | 1995-07-14 | Calculation of Production Rates and Thick-Target Yields for Platinum Isotopes Preparated at the Cyclotron | 1995 | INFN-TC_95-20.pdf | D. Arginelli, C. Birattari, M. Bonardi, M. Gallorini, F. Groppi, S. Saponaro, L. Ulrici | |
| 238 | 1995-07-10 | Gravitational Wave Observatory Based on Solid Elastic Spheres | 1995 | LNF-95-033(P).pdf | E. Coccia, J. A. Lobo, J. A. Ortega | Spherical GW detectors offer a wealth of so far unexplored possibilities to detect gravitational radiation. We find that a sphere can be used as a powerful testbed for any metric theory of gravity, not only GR as considered so far, by making use of a deconvolution procedure for all the 'electric' components of the Riemann tensor. We also find that the sphere's cross section is large at two frquencies, and advantageous at higher frequencies in the sense that a single antenna constitutes a real xylophone in its own.Proposed GW networks will greatly benefit from this. The main features of a two large sphere observatory are reported. |
| 239 | 1995-07-10 | High Power ms Pulsed Electrolysis Using Palladium Wires: Evidence for a Possible 'Phase' Transition under Deuterium Overloaded Conditions and Related Excess Heat | 1995 | LNF-95-034(P).pdf | F. Celani, A. Spallone, P. Tripodi, A. Petrocchi, D. Di Gioacchino, P. Marini, V. Di Stefano, S. Pace, A. Mancini | In this paper we describe an electrolytic experiment aimed at reaching high deuterium concentration gradients in palladium wires, using the electromigration effect. We will describe the selection criteria of experimental parameters and we will show results of our loading and calorimetric measurements. these tests reveal that a high mean valueof D/Pd has been reached in a short time and that there is a correlation between an anomalous heat emission and an electric resistivity 'transition' of the overloaded palladium. |
| 4074 | 1995-07-04 | Oscillatory Regime of Avalanche Particle Detectors | 1995 | INFN-TC_95-19.pdf | K.A. Lukin, H.A. Cerdeira, A.A. Colavita | |
| 4043 | 1995-06-29 | The b-Decay of 187Re Studied with a Cryogenic m-Calorimeter | 1995 | INFN-AE_95-17.pdf | E. Cosulich, F. Fontanelli, G. Gallinaro, F. Gatti, A.M. Swift, S. Vitale | |
| 4041 | 1995-06-23 | Velocity Operator and Velocity Field for Spinning Particles in (Non-Relativistic) Quantum Mechanics | 1995 | INFN-AE_95-15.pdf | E. Recami, G. Salesi | |
| 4042 | 1995-06-23 | About the Kinematics of Spinning Particles | 1995 | INFN-AE_95-16.pdf | G. Salesi, E. Recami | |
| 237 | 1995-06-22 | Theoretical Parameters of a Pseudo-Spherical Stepped X-Ray Diffractor | 1995 | LNF-95-032(IR).pdf | M. I. Mazuritsky, A. V. Soldatov, I. E. Stekhin, A. Marcelli | A novel type of x-ray diffractor besed on a pseudo-spherical stepped geometry is proposed. Theoretica parameters of three possible devices based on this geometry, a high-resolution 'post' monochromator for spin-dpendent x-ray absorption, a x-ray microanalyzer and a x-ray photoelectron spectrometer for chemical analysis (ESCA), are discussed. The efficiency of this flexible optical scheme for each one of these x-ray devices is calculated and found to improve substantially the existing devices based on the spherical geometry. |
| 4073 | 1995-06-19 | Functional Equations of an Elementary Operator Set | 1995 | INFN-TC_95-18.pdf | M. Bartolucci | |
| 4072 | 1995-06-06 | Dicembre 1938 - Agosto 1945: Cronistoria della Bomba Atomica | 1995 | INFN-TC_95-17.pdf | Pascolini A. | |
| 236 | 1995-06-01 | On the Connection Between Cesàro and Abel Summabilities | 1995 | LNF-95-030(P).pdf | M. Pallotta | Abel summability is obtained as a special limit from the sequence of CESA'RO moments. |
| 4040 | 1995-05-31 | Search for Light Neutral Objects Photoproduced in a Crystal Strong Field and Decaving into e+ – e- Pairs | 1995 | INFN-AE_95-14.pdf | G. Bologna et al. | |
| 234 | 1995-05-30 | DAFNE and the Experimental Program | 1995 | LNF-95-028(P).pdf | S. Bianco | The DAPHNE \\phi-factory and the FINUDA and KLOE experiments are reviewed, and their status reported. |
| 235 | 1995-05-30 | Mass of Scalar Resonances Beyond the Large -Nc Limit | 1995 | LNF-95-029(P).pdf | C. Bruno, E. Pallante | Within the Extended Nambu Jona-Lasinio model we analyse the 1/Nc- corrections to the leading order result Ms = 2Mq where Mq is the constituent quark mass. |
| 232 | 1995-05-25 | N=2 Super–W3(2) Algebra in Superfields | 1995 | LNF-95-026(P).pdf | E. Ivanov, S. Krivonos, A. Sorin | We presenta manifestly N = 2 supersymmetric formulation of N = 2 super-W3(2) algebra (its classical version) in terms of the spin 1 unconstrained supercurrent generating a N = 2 superconformal subalgebra and the spins 1/2, 2 bosonic and spins 1/2, 2 fermionic constrained supercurrents. We consider a superfield reduction of N = 2 super-W3(2) to N = 2 super W3 and construct a family of evolution equations for which N = 2 super-W3(2) provides the second hamiltonian structure. |
| 233 | 1995-05-25 | Modification of the Equivalent Photon Approximation (EPA) for 'Resolved' Photon Processes | 1995 | LNF-95-027(P).pdf | Rohini M. Godbole, M. Drees | We propose a modification of the equivalent photon approximation (EPA) for processes which involve the parton content of the photon, to take into account the suppression of the photonic parton fluxes due to the virtuality of the photon. We present simple, physically motivated ansatze to model this suppression and show that even though the parton content of the electron no longer factorizes into an electron flux function and photon structure function, it is still possible to express it as a single integral. We also show that for the TRISTAN experiments its effect can be numerically of the same size as that of the NLO corrections. Further, we discuss a possible measurement at HERA, which can provide an experimental handle on the effect we model through our ansatze. |
| 4055 | 1995-05-25 | Tunnelling Times and the 'Hartman Effect' Revisited | 1995 | INFN-FM_95-1.pdf | V.S. Olkhovsky, E. Recami, F. Raciti, A.K. Zaichenko | |
| 4039 | 1995-05-22 | Charged Pion Albedo Induced by Cosmic Antiproton Interactions with Lunar Surface | 1995 | INFN-AE_95-13.pdf | M.T. Brunetti, A. Codino, C. Grimani, M. Menichelli, M. Miozza, A.S. Stephens | |
| 230 | 1995-05-18 | FINUDA Technical Report | 1995 | LNF-95-024(IR).pdf | The FINUDA Collaboration | The present document contains an up-to-date overview of the status of the FINUDA detector. The basic design and the main physics issues remain those of the proposal. However, a considerable deal of improvements and adaptation to the machine needs was performed and the detector design is, at present, nearly frozen. Also the tests on prototypes are pratically completed, and all sub-detectors are passing to the phase of tendering and mass productions, with the objective of having the detector components ready for mid '96. |
| 231 | 1995-05-18 | Charm Photoproduction via Fragmentation | 1995 | LNF-95-025(P).pdf | M. Cacciari, M. Greco | The next-to-leading open charm production in \\gammap collitions is calculated within the Perturbative Fragmentation Function formalism, to allow resummation of \\alpha3 log(p2T/m2) terms. In the large pT region (pT> m) the result is consistent with the fixed order NLO calculation, small discrepancies being found for very large pT and the age of phase space. the two approaches differ in the definition and the relative contribution of the direct and resolved terms, but essentially agree of their sum. The resummation is found to lead to a reduced sensitivity to the choice of the renormalization/factorization scale. |
| 227 | 1995-05-09 | Strategy for the 1995 LEP Energy Scan | 1995 | LNF-95-021(P).pdf | M. Consoli, M. Piccolo | We propose a procedure to measure the Z0 line shape and take full advantage of the superb performance of the CERN e+e- Collider LEP. A precise determination of the total cross section at 5 energies is needed for a model-independent analysis of the data and for a precision test of the QED initial state radiation from the fully inclusive hadronic channel. |
| 228 | 1995-05-09 | Simulation of the Electromagnetic Component of Extensive Air Showers | 1995 | LNF-95-022.pdf | V. Patera, M. Carboni, G. Battistoni, A. Ferrari | The e. m. component of extensive air showers, as sample at a given atmospheric depth, may be cinsidered as the superposition of sub-showers initiated by photons and electrons (positrons) mainly coming from the decay of secondary mesons. A detailed simulation of showers in atmosphere as produced by gammas and electrons has been performed by means of standard high energy physics Monte Carlo codes. We developed a set of parametrizations of these sub-showers to be included in the full simulations of extensive air showers with the aim to reduce the required computer power. Comparison with previous results found in the literature are shown. |
| 229 | 1995-05-09 | First Operation and perspectives of the Superconducting Linac LISA | 1995 | LNF-95-023.pdf | M. Castellano, M. Ferrario, M. Minestrini, P. Patteri, F. Tazzioli, F. Cevenini, L. Catani | The first operation of the whole superconducting (SC) linac LISA has been carried out in March 1994. The beam has been accelerated by the four SC cavities to 18 MeV. The macropulse was 1 ms long with a current of 0,5 mA. The FEL activity is now in stand-by, although both the undulator and the optical cavity are installed or ready for installation at LNF, due to the involvement of the group in the TESLA Test Facility program. In this framework LISA will be mainly used as a test machine for SC accelerator studies and for the development of sophisticated diagnostic tools, exploiting the long macropulse and high average current not far from the TTF design parameters. In this paper we review the achievements of LISA which could be of interest to the FEL community since a number of choices in the machine design, namely in the injector, were dictated by the FEL requirements. |
| 224 | 1995-05-08 | Nuclear Photofissility at Intermediate and High Energies | 1995 | LNF-95-018.pdf | J. D. T. Arruda - Neto, A. Deppman, N. Bianchi, E. De Sanctis | The nuclear photofissility of actinides, at intermediate and high energies, was studied by means of a formalism which makes salient the aspects of preequilibrium emissions, compound nucleos formation, and fission decay of the equilibrated system. This formalism was applied in the interpretation of the recently measured photofissilities of 232Th and 238U, in the energy range 300-1200 MeV, using (a) an intranuclear cascade Monte Carlo calculation to describe the preequilibrium and thermalization processes, and (b) the statistical model for the fission decay of the compound nucleos. It was found that the nonsaturation of the 232Th photofissility, even at energies up to 1200 MeV, could be explained as a consequence of its higher nuclear trasparency, when compared with heavier actinidies. Also, the question about a possible competition between statistical and direct fission in 232Th and 238U was addressed. |
| 225 | 1995-05-08 | Physics with KLOE at DAPHNE | 1995 | LNF-95-019.pdf | P. Franzini, KLOE Collaboration | Experimental measurements which can be done at DAPHNE, the \\phi-factory under construction at the Laboratori Nazionali di Frascati dell'INFN, are presented. We also describe the KLOE detector, optimized for performing these measurements. |
| 226 | 1995-05-08 | Inclusive Charm Production at Hera and Charm Content of the Photon | 1995 | LNF-95-020(P).pdf | M. Drees, R. M. Godbole | We calculate the contribution to inclusive high tranverse momentum (pt) charm production at HERA from the excitation of charm in the photon. At large values of pt the results of such a calculation, in the structure function language, will be more reliable as it sums the large logs log (pt2/mc2), as opposed to calculating the contribution of the 2->3 subprocess in fixed order of perturbation theory. We find that this contribution is large and comparable to the contribution from \\gammag fusion production of charm. Suitable cuts on the rapidity of the 'away side' large pt jet allow a very neat separation between the contributions from the excitation process and from pair-production. We further find that including this excitation contribution we can reproduce the measured inclusive D* and \\mu cross-sections measured by the ZEUS and H1 collaborations respectively, in a LO calculation. |
| 4071 | 1995-05-08 | Applicazione del Decreto Legislativo 626 del 9.9.94 da parte dell'Istituto Nazionale di Fisica Nucleare quando Opera all'Interno delle Strutture Universitarie per Svolgere la Propria Attività di Ricerca Scientifica | 1995 | INFN-TC_95-16.pdf | F. Celletti | |
| 223 | 1995-04-27 | Nuove Metodologie di Dosimetria Biologica Applicabili alla Protezione della Salute dell'Uomo | 1995 | LNF-95-017(IR).pdf | C. Catena, D. Conti, P. Parasacchi, E. Righi | |
| 222 | 1995-04-05 | Multi-Bunch Energy Spread Induced by Beam Loading in a Standing Wave Structure | 1995 | LNF-95-016(P).pdf | M. Ferrario , A. Mosnier, L. Serafini, F. Tazzioli, J. - M. Tessier | The interaction of a relativistic beam with the models of the TM010 pass-band of a multicell cavity does not cause any problem: although all the models are excited bythe RF generator, resulting in different cell excitations during the cavity filling and the beam pulse, the net accelerating field exhibits negligible fluctuations from bunch to bunch. However, when the beam is not fully relativistic, this is no more true.The phase slippage occurring in the first cells, between the non relativistic beam and the lower pass-band models, produces an effective enhancement of the shunt impedances, which is usually negligible for a relativistic beam in a well tuned cavity. Moreover, the voltage jumps (amplitude and phase) occurring at each bunch passage, as well as the beam detuning caused by the off-crest bunches, vary from cell to cell. These effects enhance dramatically the fluctuation of the accelerating voltage, with a dominant beating provided by the pass-band mode nearest to the pimode. The induced beam energy spread has been estimated by the help of two distinct codes, developed at Frascati and Saclay, with results in good agreement. While an interaction integral is computed at each bunch passage, the cavity refilling is calculated by solving coupled differential equations of the 'modes' of the pass-band, driven by a generator linked to one end-cell. It is shown also that the intermode coupling arises from the external Q of the drive end-cell, and not from the wall losses. For illustration, we applied the method to the beam-loading problem in the SC capture cavity of the low charge injector of TESLA Test Facility installed at Desy. |
| 221 | 1995-04-03 | Tau Decays into Kaons | 1995 | LNF-95-015(P).pdf | M. Finkemeier, E. Mirkes | Predictions for semi-leptonic decay rates of the \\tau lepton into two meson final states K-\\pi0\\nu\\tau, K0\\pi-\\nu\\tau, K0K-\\nu\\tau, and three meson final states K-\\pi-K+\\nu\\\\tau, K0\\pi-K0\\nu\\tau, Ks\\pi-Ks\\nu\\tau, Ks\\pi-KL\\nu\\tau, KL\\pi-KL\\nu\\tau, K-\\pi0K0\\nu\\tau, \\pi0\\pi0K-\\nu\\tau, K-\\pi-pi+\\nu\\tau, \\pi-K0\\pi0\\nu\\tau are derived. The hadronic matrix elements are expressed in terms of form factors, which can be predicted by chiral Lagrangians supplemented by informations about all possible low-lying resonances in the different channels. Isospin symmetry relations among the different final states are carefully taken into account. The calculated branching ratios are compared with measured decay rates where data are available. |
| 4038 | 1995-03-31 | Introduction to Beauty-Hadron Physics | 1995 | INFN-AE_95-12.pdf | A. Fridman | |
| 220 | 1995-03-29 | The KLOE Data Acquisition System | 1995 | LNF-95-14(IR).pdf | KLOE - Collaboration | We present in the following the design of the KLOE Data Acquisition System. Included are the philosophy and extensive discussions on all parts of the system. |
| 218 | 1995-03-27 | Study of the High Energy Cosmic Ray Cascades using the Dual Parton Model | 1995 | LNF-95-012.pdf | G. Battistoni, C. Forti, J. Ranft | In this paper we describe an application of the two component dual parton model, for the simulation of high energy cosmic ray cascades. The dpmjet interaction model has been tuned to accelerator data for hadron-nucleus and nucleus-nucleus interactions, and its performance in the fragmentation region has been optimized. We make use of this generator inside the HEMAS shower code. Results are presented with particular emphasis on the electromagnetic component and on the high energy muon content of the showers. |
| 219 | 1995-03-27 | The Influence of Interstitial Solutions (H,N) on the Cerium Electronic State in Ce-Fe Intermetallic Compounds: an X-Ray Absorption spectroscopy (XAS) Study | 1995 | LNF-95-013.pdf | J. Chaboy, A. Marcelli, L. Bozukov | We present an x-ray absorption spectroscopy (XAS) investigation performed at the L-edges of the rare-earth and the K-edge of iron in the R-Fe intermetallic compounds (La,Ce)2Fe14BH\\chiand Ce2Fe17(H,N,)\\chi, to elucidate the role of the interstitial doping into the electronic and magnetic properties of these systems. Comparison with x-ray circular magnetic dichroism (XCMD) experiments has been carried out to clarify the localization of 4f magnetic moment at the Ce sites upon hydriding. Both XAS and XCMD results evidence the interplay between the structural and magnetic changes, that are associated to the modification of the hybridization between the Fe(3d) and Ce(5d) bands. |
| 4036 | 1995-03-27 | Measurement of Spatial Resolution and Charge Collection in Double Sides Double Metal Silicon Micrpstrip Detectors | 1995 | INFN-AE_95-10.pdf | C. Troncon | |
| 4037 | 1995-03-27 | The DELPHI Microvertex Detector with Double Sides Readout | 1995 | INFN-AE_95-11.pdf | C. Troncon | |
| 4070 | 1995-03-22 | La Scheda VME di Event Bunch Finder per il Trigger di Muoni dell’ Esperimento L3 | 1995 | INFN-TC_95-15.pdf | M.G. Alviggi, R. De Asmundis, M. Di Pietro, L. Parascandolo, P. Parascandolo, D. Piccolo | |
| 4068 | 1995-03-15 | A Study of Plasma Effects in a 'Non-Plasma' Regime in Electron Beams Production on al Target by Excimer Laser | 1995 | INFN-TC_95-13.pdf | A. Beloglazov, V. Nassini, M. Primavera | |
| 4069 | 1995-03-15 | Numerical Simulations of Head-Tail Instabilities in the HERA Proton Ring | 1995 | INFN-TC_95-14.pdf | F. Galluccio | |
| 4034 | 1995-03-10 | A Silicon pad Shower Maximum detector for a 'Shashlik' Calorimeter | 1995 | INFN-AE_95-8.pdf | M. Paganoni et al. | |
| 4035 | 1995-03-10 | The Small Angle Tile Calorimeter Project in DELPHI | 1995 | INFN-AE_95-9.pdf | M. Bonesini et al. | |
| 4033 | 1995-03-09 | A New Look at the Dirac Quantization Conditions | 1995 | INFN-AE_95-7.pdf | E. Gozzi | |
| 216 | 1995-03-08 | Detection of Gravitational Waves with Spherical Antennas | 1995 | LNF-95-010(P).pdf | E. Coccia, J. Alberto Lobo | We report on an investigation of the possibilities offered by solid resonant spheres to detect gravitational radiation. a spherical detector has isotropic sensibility and can determine the source direction and wave polarization providing vetoes on General Relativity. A deconvolution procedure for a general gravitational wave is described, along with tests and vetoes on the trace and transversality properties of gravitational waves. We find that the sphere's gravitational wave absorption cross section is large at two frequences and that if the wave direction is known, a spherical detector can determine all thesix polarization states predicted by the most general metric theory. Assuming General Reativitiy, a two sphere observatory completes the devolution process, removing the 180^ ambiguity in the source position, enablingthe determination of the gravitational wave speed and providing powerful vetoes on local disturbances. We discuss the sensibility of spheres of different materials and frequences of operation. A 3 metres diamenter Al5056 sphere is shown to be able to reach a 1 ms burst sensibility of h = 6 x 10-22 if operated at the quantum limit. |
| 4066 | 1995-03-03 | Setting up the LNS Library Management System | 1995 | INFN-TC_95-11.pdf | G. Agnello | |
| 4067 | 1995-03-03 | Study and Operation on the Injection, Acceleration and Extraction Processes for the LNS Superconducting Cyclotron Commissioning | 1995 | INFN-TC_95-12.pdf | L. Calabretta, D. Rifuggiato | |
| 4053 | 1995-03-03 | The Large Angle Electromagnetic Shower Calorimeter for CLAS: Module Design and Optimisation of Performancies | 1995 | INFN-BE_95-3.pdf | M. Anghinolfi, N. Bianchi, G.P. Capitani, P. Corvisiero, E. De Sanctis , V.I. Mokeev, V. Muccifora, M. Olcese, E. Polli, A.R. Reolon, G. Ricco, M. Ripani, P. Rossi, M. Sanzone, A. Zucchiatti | |
| 215 | 1995-02-28 | Structure of a–Si1–xCx:H Alloys by Wide–Angle X–Ray Scattering: Detailed Determination of First– and Second–Shell Environment for Si and C Atoms | 1995 | LNF-95-009.pdf | C. Meneghini, F. Boscherini, F. Evangelisti, S. Mobilio | We present a study of the structure of a-Si1-xCx:H allois by wide-angle x-ray scattering. By carefully analyzing the radial distribution functions and comparing with previous extended x-ray-absorption fine structure measurements, we provide a detailed and quantitative description of local bonding around Si and C atoms. Among the results presented, most noteworthy are constant interatomic distances in first and second shells and the detection of a strong tendency for chemical order. |
| 4065 | 1995-02-28 | Memo on the Radon Cleaning Methods for Gases | 1995 | INFN-TC_95-10.pdf | L. Cadonati, M. Laubenstein, G. Manuzio, A. Preda, R. Tartaglia | |
| 214 | 1995-02-27 | Large pT Hadroproduction of Heavy Quarks and Quarkonia | 1995 | LNF-95-008(P).pdf | M. Greco | The production of heavy quarks at large Pt (Pt >> m) in hadronic collisions is considered in the framework of perturbative fragmentation functions, allowing a resummation at the NLO level of final state large mass logarithms of the kind log (Pt/m). The resulting theoretical uncertainty from factorization/renormalizationscales at large Pt is shown to be much smaller than that shown by the full 0 (\\alpha3) perturbative calculation. Then the production of heavy quarkonia at large tranverse momenta is discussed by including the mechanism of fragmentation, in particular the direct fragmentation to J/\\psi and the fragmentation to \\chi states followed by radiative decay to J/\\psi. The overall theoretical estimate is shown to be nearly consistent with the experimental observation for J/\\psi. On the contrary the situation is quite unsatisfactory for the \\psi', demanding for a new mechanism dominating the production process. |
| 211 | 1995-02-20 | Microcanonical Fermionic Average Method in the Schwinger Model: A Realistic Computation of the Chiral Condensate | 1995 | LNF-95-005.pdf | V. Azcoiti, G. Di Carlo, A. Galante, A. F. Grillo, V. Laliena | The microcanonical fermionic average method has been used so far in the context of lattice models with phase transitions at finite coupling. To test its applicability to asymptotically free theories, we have implemented it in two-dimensional QED, i.e., the Schwinger model. We exploit the possibility, intrinsic to this method, of studyng the whole \\beta,m plane without extra computer cost, to follow constant physics trajectories and measure the m-0 limit of the chiiral condensate. We recover the continuum result within three decimal places. Moreover, the possibility, intrinsic to the method, of performing simulations directly in the chiral limit allows us to compute the average plaquette energy at m=0, the result being in perfect agreement with the expected value. |
| 212 | 1995-02-20 | Inclusive Particle Photoproduction to Next–to Leading Order | 1995 | LNF-95-006.pdf | M. Greco, S. Rolli, A. Vicini | We study the inclusive photoproduction of neutral and charged pions and \\mu at HERA, via the resolved photon mechanism, in QCD to next-to-leading order. We present various distributions of phenomenological interest and study the theoretical uncertainties due to the mass scales, and to proton sets of structure functions. A new set of fragmentation functions for charged pions is also presented. |
| 213 | 1995-02-20 | Two Photon Interaction Measurements with the KLOE Small Angle Tagging System | 1995 | LNF-95-007(P).pdf | F. Anulli, R. Baldini Ferroli, , M. Bassetti, A. Courau, I. Cohen, A. Moalem, G. Pancheri, M. Preger, L. Razdolskaja, P. Sergio, A. Zallo | The two photon processes \\gamma\\gamma-\\pi0,\\eta,\\pi0\\pi0,\\pi+\\pi-,\\pi0\\eta,\\eta', expected in e-e+ collitions at DAPHNE, can be studied with high precision by introducing a small angle tagging facilities for the scattered electrons. We describe the design of the KLOE small angle tagging system to study \\gamma\\gamma interactions at DAPHNE. This includes a COIL detector to tag particles hitting the SFM coils, a SAT detector to tag electrons passing through the SFM and a BREM detector for high energy photons in coincidence with tagged electrons in order to reject the radiative Bhabba events. Two such systems placed symmetrically with respect to the interaction point allow tagging both electrons and positrons. The maximum number of events/year that can be collected by this tagging system and the statistical error on the \\gamma\\gamma-\\pi0\\pi0 cross section are also discussed. |
| 4052 | 1995-02-17 | Monte–Carlo Code for Simulation of the Large Angle Electromagnetic Shower Calorimeter for CLAS Detector | 1995 | INFN-BE_95-2.pdf | V.I. Mokeev, M. Taiuti, M. Anghinolfi, N. Bianchi, G.P. Capitani,P. Corvisiero, E. De Sanctis, A. Fantoni, P. Levisandri, L. Mazzaschi, V. Muccifora, E. Polli, A.R.Reolon, G. Ricco, M. Ripani, P. Rossi, M. Sanzone, A. Zucchiatti | The Monte-Carlo program for simulation of the Large Scattering Angles Electromagnetic Shower Calorimeter, which will be istalled in Hall B CEBAF US laboratory, is presented. The code test and simulation results are considered. |
| 4051 | 1995-02-15 | Liquid Scintillator for Very High Mass andLow Background Detectors | 1995 | INFN-BE_95-1.pdf | F. Gatti, G. Morelli, G. Testera, S. Vitale | |
| 4064 | 1995-02-15 | Water Dynamics Inside the Counting Test Facility (CTF) Tank at the Gran Sasso Underground Laboratories | 1995 | INFN-TC_95-9.pdf | M. Olcese | |
| 4032 | 1995-02-08 | A Silicon Tracker for the Anti Matter Spectrometer on the International Space Station ALPHA | 1995 | INFN-AE_95-6.pdf | R. Battiston | |
| 4031 | 1995-02-07 | Temperature Dependence of Time Resolution and Electronic Noise in a Silicon Detector Telescope | 1995 | INFN-AE_95-5.pdf | A. Codino, C. Federico. C. Grimani, T. Macchiaiolo, M. Menichelli, G. Minelli, M. Miozza, M.T. Brunetti, P. Poulin | |
| 210 | 1995-02-06 | Polarization Effects in Electron Compton Scattering | 1995 | LNF-95-004(IR).pdf | D. Babusci, G. Giordano, G. Matone | In this paper we present the full calculation of the final photon polarization in the Compton scattering on electron gamma+e-gamma+e. We claim to be in disagreement with some of the results quoted in Ref. [4]. |
| 4063 | 1995-02-06 | WWW Un Modo di Comunicare | 1995 | INFN-TC_95-8.pdf | A. Richetti | |
| 4062 | 1995-02-02 | A possible Front-end Readout Scheme for the Resistive Plate Chamber Detector at BABAR | 1995 | INFN-TC_95-7.pdf | N.Cavallo, L.Parascandolo and P.Parascandolo | |
| 4030 | 1995-02-01 | Bos Production and Decay at LEP and CDF | 1995 | INFN-AE_95-4.pdf | M. Bonesini | |
| 207 | 1995-01-31 | DANTE: Control System for DAFNE Based on Macintosh and LabVIEW | 1995 | LNF-95-001.pdf | G. Di Pirro, C. Milardi, A. Stecchi, L. Trasatti | DANTE (DAPHNE new tools enviroment) is the control system for the DAPHNE PHI-Factory uder construction at the Frascati National Laboratories of the Italian Institute for Nuclear Physics (INFN). The main design goal has been to keep the software simple and easy to debug. Commercial components have been used whenever possible, with a preference for widey diffused and well established products, as opposed to 'standards'. Macintosh computers are used throughout the system and LabVIEW has been choosen as development enviroment. We strongly oppose the 'start from scratch' philosophy. |
| 208 | 1995-01-31 | On the Developing of Net Ce Magnetic Moment Upon H2 Absorption in Ce2Fe14B: An XCMD Investigation | 1995 | LNF-95-002.pdf | J. Chaboy, A. Marcelli, J. Garcia, H. Maruyama, L. M. Garcia, K. Kobajashi, L. Bozukov | We present a combined X-ray Absorption Spectroscopy (XAS) and X-ray Circular Magnetic Dichroism (XCMD) investigation performed at the Ce L-edges in the case of Ce2Fe14B and its hydride derivantives. Both XAS and XCMD data do not show any modification of the mixed-valence electronic state of cerium upon hydriding. In fact, our results rule out the hypothesis of the presence of a pure Ce3+ configuration in the hydride derivative and the resulting induction of a localized 4f magnetic moment on the Ce sites upon hydriding. |
| 209 | 1995-01-31 | Coincidences in Gravitational Wave Experiments | 1995 | LNF-95-003(P).pdf | P. Astone, G. Pizzella, ROG Collaboration | The experimental information about gravitational waves is practically nonexistent. The only available experimental information comes from the binary pulsar PSR 1913+16 by J.H. Taylor and J.M. Weisberg(1), which shows indirect evidence for gravitational waves emitted by a continuous source and their quadrupole nature. We believe it is likely that the direct observation of gravitational waves will show phenomena at present unpredictable, as most of the times have happened in science for new discoveries. In designing the experiment we must certainly take into consideration the present theories of gravity , but we must be careful not rely on them too much. We must try to keep our mind open. Our search for gravitational waves will be based on experimental data obtained by applying the technique of coincidences among two or more detectors and by the statistical treatment of the data. We believe that this is one of the most delicate problems. In the following we shall discuss an experimental method to estimate the probabilities, already used by Joe Weber and by the gravitational waves hunters who had operating detectors. The outcome of this method we call experimental probability. We shall indicate the care needed when applying to the raw data filtering procedures for detecting small signals embedded into noise and finally we shall discuss the importance that the probability be estimated only on 'a priori' bases. |
| 4029 | 1995-01-20 | Charm Spectroscopy and Lifetime | 1995 | INFN-AE_95-3.pdf | G. Bellini | |
| 4061 | 1995-01-18 | High Brightness Electron Beams Induced by Excimer Lasers on Metal Targets | 1995 | INFN-TC_95-6.pdf | A. Beloglazov, M. Martino V. Nassini | |
| 4027 | 1995-01-03 | A Liquid Scintillator Calorimeter for the Forward Region of an LHC Experiment | 1995 | INFN-AE_95-1.pdf | AS. Artamonov, V. Epstein, P. Gorbunov, V. Jemanov, V.Khovansky, S. Kruchinin, A. Maslennikov, M. Rjabinin, V. Zaitsev, S. Zeldovich, I. Zuckerman, V. Barassi, S. Buontempo, A. Ereditato, G. Fiorillo, F. Garufi | |
| 4060 | 1995-01-03 | The Directory Service X.500 in INFN | 1995 | INFN-TC_95-1.pdf | P. Bonetti, G. Vita Finzi | |
| 4028 | 1995-01-03 | The b-Decay of 187ReStudied with a Cryogenic Microcalorimeter Status Report | 1995 | INFN-AE_95-2.pdf | E. Cosulich, F. Fontanelli, G. Gallinaro, F. Gatti, S. Vitale | |
| 4059 | 1995-01-03 | C-LAN Progetto di Test: Descrizione Infrastruttura e Risultati | 1995 | INFN-TC_95-2.pdf | A. Ghiselli, D. Salomoni, C. Vistoli, S. Zani, U. Zanotti, A. Brunengo, C. Salvo, M. Campanella, L. Carbone, C. Battista, A. Spanu, L. Gaido | |
| 4058 | 1995-01-03 | Schema dell'Indirizzo ISO DCC NSAP per l'Italia | 1995 | INFN-TC_95-3.pdf | F. Delpino, A. Ghiselli | |
| 4057 | 1995-01-03 | OSI-NSAP: un Indirizzamento Gerarchico per il GARR Formato, Domini di Routing ed Organizzazione | 1995 | INFN-TC_95-4.pdf | A. Ghiselli, R. Gomezel, F. Delpino | |
| 4056 | 1995-01-03 | L'INFN a Genova Una Rivisitazione Personale di una Storia di 40 Anni | 1995 | INFN-TC_95-5.pdf | C. Caso | |
| 347 | 1994-12-22 | Status of DAFNE and KLOE | 1994 | LNF-94-077(P).pdf | J. Lee Franzini | An e+ e- collider, christened DAPHNE, optimized for operation at a total energy of 1020 MeV, the mass of the \\phi meson, is now under construction at the Laboratori Nazionali di Frascati of the INFN. Here we report on DAPHNE's machine parameters, \\phi production rates and its present status. We discuss its particle physics program, which includes CP violation and other symmetry studies, tests of chiral perturbation calculations and light meson spectroscopy. The general purpose detector, KLOE, being built for performing these experiments is described and its current progress is discussed. |
| 348 | 1994-12-22 | Azimuthal Correlations in gg Æ p0p0 at DAFNE | 1994 | LNF-94-078(P).pdf | S. Bellucci, A. Courau, S. Ong | An investigation of azimuthal correlations in double-tag experiment \\gamma\\gamma\\rightarrow\\pi^0\\pi^0 at DAPHNE provides an interesting test of chiral perturbation theory up to O(p^6). |
| 349 | 1994-12-22 | Models and Mathematical Tools in Meson Spectroscopy | 1994 | LNF-94-079(P).pdf | F. Nichitiu | One of the most important tasks in modern spectroscopy is to identify and characterise different types of non-(q\\overline(q)) mesons. Since a non-(q\\overline(q)) state, if it exists, appears in an 'environment' of many other 'normal' (q\\overline(q)) states, and since the actual strategy is to observe similar meson states in a variety of processes (that the new generation of experiment are providing with good accuracy and high statistic) we need to develop methods and models which are able to disentangle from data the exotic information. in this paper we intend to make the point on the present status of modern analysis used specifically in meson spectroscopy from low energy nucleon-antinucleon annihilation putting in evidence the present uncertain points and the used approximations which still need a confirmation. |
| 350 | 1994-12-22 | Nilpotent Commuting Fields | 1994 | LNF-94-080.pdf | F. Palumbo | Bilinear composites of anticommuting consistents constituents are even elements of a Grassmann algebra, which are nilpotent commuting variables (NCV). We define an integral on these variables and start investigating the properties of nilpotent commuting scalar fields. |
| 4026 | 1994-12-22 | Datazione di Ossidiane con il Metodo delle Tracce di Fissione | 1994 | INFN-TC_94-27.pdf | R . Bonetti, L. Bongiorno, A. Guglielmetti, F. Malerba | |
| 4025 | 1994-12-16 | A Study of the Cosmic–Ray Induced Backgroung in Two–Photon Correlation and Neutral Pion Production Measurements with a BaFe2 Multidetector | 1994 | INFN-TC_94-26.pdf | A. Badalà, R. Barbera, A. Palmeri, G.S. Pappalardo, F. Riggi, A.C. Russo, G. Russo, R. Turrisi | |
| 5727 | 1994-12-16 | RESULTS ON THE SPIN DEPENDENT STRUCTURE FUNCTIONS OF THE PROTON. | 1994 | INFN-AE-94-29.pdf | F. Tessarotto. | The spin-dependent structure functions of the proton <a href='https://www.codecogs.com/eqnedit.php?latex=g_{1}^{p}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?g_{1}^{p}' title='g_{1}^{p}' /></a> and <a href='https://www.codecogs.com/eqnedit.php?latex=g_{2}^{p}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?g_{2}^{p}' title='g_{2}^{p}' /></a> have recently been measured in inclusive polarised muon scattering by the SMC at CERN. The first moment of <a href='https://www.codecogs.com/eqnedit.php?latex=g_{1}^{p}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?g_{1}^{p}' title='g_{1}^{p}' /></a> has been estimated at <i>Q</i><sup>2</sup> = 10 GeV<sup>2</sup> to be <a href='https://www.codecogs.com/eqnedit.php?latex=\Gamma&space;_{1}^{p}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Gamma&space;_{1}^{p}' title='\Gamma _{1}^{p}' /></a> = 0.136 ± 0.011(stat.) ± 0.011(syst.), in disagreement with the Ellis-Jaffe prediction: <a href='https://www.codecogs.com/eqnedit.php?latex=\Gamma&space;^{p}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Gamma&space;^{p}' title='\Gamma ^{p}' /></a><sub><i>E.J.</i></sub> = 0.176 ± 0.006. Using all published data on <i>g</i><sub>1</sub> of the proton, the neutron and the deuteron a confirmation of the Bjorken sum rule at the 10% accuracy level was achieved and estimates of the quark spin contribution to the nucleon spin <a href='https://www.codecogs.com/eqnedit.php?latex=\Delta&space;\Sigma&space;\approx' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Delta&space;\Sigma&space;\approx' title='\Delta \Sigma \approx' /></a> 0.30 were obtained. |
| 3999 | 1994-12-16 | Coherent Pions in Nucleus–Nucleus Collisions at intermediate Energies | 1994 | INFN-BE_94-6.pdf | A. Badalà, R. Barbera, A. Palmeri, G.S. Pappalardo, F. Riggi, A.C. Russo, G. Russo, R. Turrisi | |
| 346 | 1994-12-09 | Radiative Corrections to pl2 and Kl2 Decays | 1994 | LNF-94-076(IR).pdf | M. Finkemeier | We reexamine the radiative corrections to \\pi_l2 and K_l2 decays. We perform a matching calculation, using a specific model with vector meson dominance in the long distance part and the parton model in the short distance part. By considering the dependence on the matching scale and on the hadronic parameters, and by comparing with model independent estimates, we scrutinize the model dependence of the results. For the pseudoscalar meson decay constants, we extract the values f_\\pi =(92.1 +- 0.1)MeV and f_K =(112.4 +- 0.9)MeV. For the ratios R_\\pi and R_K of the electronic and muonic decay modes, we predict R_\\pi = (1.2354 +- 0.0002) x 10^-4 and R_K = (2.472 +- 0.001) x 10^-5. |
| 345 | 1994-12-06 | Elastic and Inelastic Diffraction of High Energy Hadrons | 1994 | LNF-94-075(P).pdf | A. Malecki | |
| 343 | 1994-12-05 | Radiative Corrections to Kl2 Decays | 1994 | LNF-94-073(P).pdf | M. Finkemeier | We consider K_l2 decays to the order O(\\alpha). We perform a matching calculation, using a specific model with vector meson dominance in the long distance part and the parton model in the short distance part. By considering the dependence on the matching scale and the hadronic parameters, and by comparing with the leading model independent predictions, we scrutinize the model dependence of the results. |
| 344 | 1994-12-05 | Photon– Photon Scattering to Two Loops in ChPT | 1994 | LNF-94-074(P).pdf | S. Bellucci | We analyze the Chiral Perturbation Theory predictions for \\gamma\\gamma\\rightarrow\\pi^0\\pi^0 to two loops. The amplitude to this order depends on three new counterterms which can be estimated using resonance excange. The low-energy cross section is in good agreement with the present data and with calculations based on dispersion relations. We predict the Compton cross section and the neutral pion polarizabilities to the two-loop order. The unitarization of the one-loop cross section is also discussed. |
| 3989 | 1994-12-05 | A Cellular Automaton to Filter Events in a High Energy Physics Discrete Calorimeter | 1994 | INFN-AE_94-28.pdf | M. Casolino, P.G. Picozza | |
| 5726 | 1994-11-29 | AN OVERVIEW OF THE NONLINEAR QED EFFECTS IN THE CONTEXT OF MEASUREMENTS OF VACUUM BIREFRINGENCE IN THE PVLAS EXPERIMENT - EARLY ESTIMATES. | 1994 | INFN-AE-94-27.pdf | D. Bakalov. | The PYLAS experiment, in preparation at the INFN Laboratori Nazionali di Legnaro [1] is designed to measure for the first time the effects of the interaction of photons with external magnetic fields. QED predicts that external electromagnetic fields produce virtual electron-positron pairs; what is experimentally observed as photon-photon interactions is in fact the EM interaction of the latter with the virtual pairs. In the PYLAS experiment the photons of a linearly polarized laser beam cross a region in which is present a constant and fairly homogenious external magnetic field B<sub>0</sub><a href='https://www.codecogs.com/eqnedit.php?latex=\approx' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\approx' title='\approx' /></a>10<sup>5</sup>G); the dominating effect - most naturally interpreted in terms of optical quantities - is expected to be the <i>birefringence of the vacuum</i> induced by the external field. This effect, analogous to the Delbruck scattering of photons in the Coulomb field of atomic nuclei [2], is very hard to detect because the magnetic fields B<sub>0</sub> that can actually be created in a laboratory are by far below the critical value B<sub>cr</sub>=c<sup>3</sup>m<sup>2</sup>/eh<a href='https://www.codecogs.com/eqnedit.php?latex=\approx' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\approx' title='\approx' /></a>4.10<sup>13</sup>G. In the language of optics, the effects of photon-photon interactions when a linearly polarized monochromatic beam propagates through a constant magnetic field could give rise to: a) non-zero elipticity of the laser beam polarization; b) rotation of the polarization plane; c) diffusion and dispersion of the beam, etc. Our attention in the present note will be focused - in the context of the PYLAS experiment - on the elipticity acquired by an initially linearly polarized beam along its path through the birefringent vacuum. The experimental setup allows - in principle - for measurments with a high relative accuracy of 10<sup>-2</sup> and better; the interpretation of the results requires a careful analysis of all the physical phenomena that contribute at this level. Our consideration will be very often based on and make use of results in the years 1960-1970 and even earlier with - in the meantime - the specific features of the PYLAS experiment being kept in mind. Of primary importance will be the facts that the optical path of the photons lies within a Fabry-Perot resonator of very high finesse (corresponding to a magnification factor for the observable effects of upto 30000) and that the magnetic field (except for the boundary regions) is fairly homogenious. A detailed description of the PYLAS experiment can be find in [1]. |
| 339 | 1994-11-28 | Linearizing W2,4 and W B2 Algebras | 1994 | LNF-94-069(P).pdf | S. Bellucci, S. Krivonos, A. Sorin | It has recently been shown that the W_3 and W^(2)_3 algebras can be considered as subalgebras in some linear conformal algebras. In this paper we show that the nonlinear algebras W_2,4 and W B_2 as well as Zamolodchikov's spin 5/2 superalgebra also can be embedded as subalgebras into some linear conformal algebras with a finite set of currents. These linear algebras give rise to new realizations of nonlinear algebras which could be suitable in the construction of W-string theories. |
| 340 | 1994-11-28 | Medical Surveillance of Workers Exposed to Ionizing Radiations | 1994 | LNF-94-070.pdf | M. Gelas, M. Giraud, E. Righi, L. Tobajas | |
| 341 | 1994-11-28 | Thickness and Density Determination for Ni-C-Ni Ultrathin Film by Photoemission and X-Ray Fluorescence Measurements under Total External Reflection | 1994 | LNF-94-071.pdf | E. Burattini, G. Cappuccio, V. Sessa, I. Yu. Kharitonov, M. V. Kovalchuk, N. N. Novikova, A. N. Sosphenov, S. I. Zheludeva | |
| 342 | 1994-11-28 | Characterization by XRPD of Diamond Films Grown on Titanium | 1994 | LNF-94-072.pdf | G. Cappuccio, V. Sessa, M. L. Terranova, C. Veroli | |
| 5725 | 1994-11-24 | AGK CUTTING RULES AND PERTURBATIVE QCD. | 1994 | INFN-AE-94-26.pdf | D. Treleani. | The purpose of the present note is to describe a few features of semi-hard interactions, in high energy nuclear collisions, that are better understood with the help of the AGK cutting rules and of the probabilistic picture of the interaction which follows. In the first part of the article the cutting rules are discussed for a simplest component of the forward three-body-parton amplitude in the large-s fixed-<i>t</i> limit. The case considered corresponds to the term, at the lowest order in the coupling constant and with vacuum quantum number exchange in both <i>t</i>-channels, of the amplitude which describes the interaction of a high energy quark with the two target quarks. The different leading cuts of the amplitude are shown to be proportional to one another with the same weights of the cutting rules discussed in the context of multi-Pomeron exchange. The probabilistic picture of the multiple interactions, which is originated from the cutting rules, and the self shadowing cross sections are then discussed. The second part of the article is dedicated to the semi-hard interactions. The semi-hard cross section in high energy nucleus-nucleus collisions is represented as a self-shadowing cross section, and a feature which is pointed out is that the single scattering factorized expression of the perturbative-QCD-parton model holds at any order in the multi-parton correlations, the relation being the analogous of the AGK cancellation for the average number of soft interactions in high energy hadronnucleus collisions. An infrared problem which finds a solution within the self shadowing representation of the semi-hard cross section is finally discussed. |
| 4024 | 1994-11-24 | ULTRIX: Guida alla Gestione di Sistemi Complessi | 1994 | INFN-TC_94-25.pdf | A. Bassi, M.L. Luvisetto, E. Ugolini | |
| 4023 | 1994-11-18 | A PC Based Silicon Data Acquisition System | 1994 | INFN-TC_94-24.pdf | Gian Mario Bilei, Bruno Checcucci, Jianguro Ding | |
| 338 | 1994-11-16 | Triplet Higgs Bosons at Electron–Positron Colliders | 1994 | LNF-94-068(P).pdf | R. Godbole, B. Mukhopadhyaya, M. Nowakowski | We investigate the possibility of probing the triplet Higgs boson sector via single charged Higgs production in the process e^+e^-\\rightarrow H+l_vl, at high energy electron-positron colliders, using the tree level H^+W^-Z coupling which is a unique feature of such models. We find that even LEP-200 can give nontrivial information upto M_H+-\\simeq 120 GeV if the doublet-triplet mixing is not restricted by the current value of the \\rho parameter which is the case in models with a custodial Symmetry. Further we point out that in such models, the 4-body, tree level decay H^+\\rightarrow W*Z*\\rightarrow 4 fermions dominates and hence provides a very clean signal when the four fermions are leptons. At NLC the discovery range for the charged Higgs in triplet models via this process is \\sim 400 GeV. |
| 4021 | 1994-11-14 | An Investigation of the Thermal Wave Model Using the Galarkin Method | 1994 | INFN-TC_94-22.pdf | R. Fedele, G. Miano, L. Verolino | |
| 4022 | 1994-11-14 | Coupling Impedance Measurements: An Improved Wire Methods | 1994 | INFN-TC_94-23.pdf | V.G. Vaccaro | |
| 336 | 1994-11-10 | Tau Decays into Four Pions | 1994 | LNF-94-066(IR).pdf | R. Decker, M. Finkemeier, P. Heiliger, H. H. Jonsson | We compute branching ratios and invariant mass distributions of the tau decays into four pions. The hadronic matrix elements are obtained by starting from the structure of the hadronic current in chiral limit and then implementing low-lying resonances in the different channels with slowly varying coupling constants. Reasonable agreement with experiment is obtained both for the \\tau\\rightarrow v_\\tau + (4\\pi) decay rates and the e^+e_-\\rightarrow (4\\pi) cross sections. We derive a new prediction for the decay rate of \\tau^-\\rightarrow v_\\tau2\\pi^-\\pi^+\\pi^0 which is significantly lower than a previous one. Furthermore we supply an interface to use our matrix elements within the Tauola Monte-Carlo program. |
| 337 | 1994-11-10 | Radiative Corrections to the Decay t Æ p nt | 1994 | LNF-94-067(IR).pdf | R. Decker, M. Finkemeier | We have calculated the radiative corrections to the decay \\tau\\rightarrow\\pi(K)v_\\tau, taking to account internal bremsstrahlung and structure dependent radiation in the radiative decay and set point meson, hadronic structure dependent and short distance contributions in the virtual corrections. We display the spectra of the photon energy and of the pion-photon invariant mass in the decay \\tau\\rightarrow\\pi v_\\tau\\gamma and compare with the PHOTOS Monte-Carlo. Our result for the radiative correction to the ratio\\Gamma(\\tau\\rightarrow\\pi v_\\tau(\\gamma))/ \\Gamma(\\pi\\rightarrow\\mu v_\\mu(\\gamma)) is \\deltaR_\\tau/ \\pi = (0.16 +- 0.14)% and for the ratio \\Gamma(\\tau\\rightarrowKv_\\tau(\\gamma))/ \\Gamma(K\\rightarrow\\mu v_\\mu(\\gamma)), we obtain \\deltaR_\\tau/k = (0.90 +- 0.22)%. |
| 335 | 1994-11-09 | Pion (Kaon) and Sigma Polarizabilities | 1994 | LNF-94-065(P).pdf | S. Bellucci | We report the results of the working group on 'Pion (Kaon) and Sigma Polarizabilities'. Interesting possibilities to measure these polarizabilities include the radiative pion photoproduction in the MAMI experiment at Mainz, as well as at the GRAAL facility (actually the latter is being considered for an experimental determination of the pion polarizabilities here for the first time), the experimental plans on Primakoff effect at FNAL, and the measurements at the Frascati \\Phi-factory DAPHNE. |
| 332 | 1994-10-31 | Evaluation of the Radioactive and Noxious Gas Production for the DAPHNE Complex | 1994 | LNF-94-062(IR).pdf | L. Liberatori | One of the radiation protection problems usually considered around the accelerators is the radioactive and noxious gas production. In this note such a problem will be examined for the DAPHNE complex in order to establish the precautions to take for ensuring safe working conditions to the staff of the machines and to the other employees of the centre. Air inside the hall housing the machines will be activated by bremsstrahlung and by neutron radiation generated during the operation of the machines. The air irradiation also causes the formation of noxious gases such as ozone and nitrogen oxides and consequently an evaluation of the production of these gases has been also made. The concentration estimations inside the halls of the DAPHNE complex have been made on the basis of the realistic operation conditions of the machines, but conservative assumptions have been adopted in calculations, particularly regarding the values of the saturation activities. The radioactive gases produced inside the buildings housing the machines will be released in the external environment owing to the natural air-change inside the halls or to the forced ventilation. The atmospheric dispersal could expose the workers outside the buildings and the population, up to large distances from the centre, to radiological risks. Therefore, on the basis of a model of atmospheric dispersion the risks due to the releases activities from the DAPHNE complex have been evaluated. |
| 333 | 1994-10-31 | \\Phi and \\omega Meson Production in `np Annihilation and the OZI Rule | 1994 | LNF-94-063.pdf | V . G. Ableev, M. Agnello, F. Balestra, G. Bendiscioli, A. Bertin, G. C. Bonazzola, E. Botta, T. Bressani, M. Bruschi, M. P. Bussa, L. Busso, D. Calvo, M. Capponi, B. Cereda, P. Cerello, C. Cicalò, M. Corradini, S. Costa, S. DeCastro, F. D' Isep, A. Donzella, L. Fava, A. Feliciello, L. Ferrero, A. Filippi, V. Filippini, A. Fontana, T. D. Galli, R. Garfagnini, U. Gastaldi, B. Giacobbe, P. Giannotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lanaro, E. Lodi Rizzini, V. Lucherini, A. Maggiora, S. Marcello, U. Marconi, G. V. Margagliotti, A. Masoni, B. Minetti, P. Montagna, M. Morando, F. Nichitiu, M. Nupieri, D. Panzieri, G. Pauli, M. Piccinini, G. Puddu, E. Rossetto, A. Rotondi, A. M. Rozhdestvensky, A. Saino, P. Salvini, L. Santi, M. G. Sapozhnikov, N. Semprini Cesari, S. Serci, R. Spighi, P. Temnikov, S. Tessaro, F. Tosello, V. I. Tretyak, G. Usai, S. Vecchi, L. Venturelli, M. Villa, A. Vitale, A. Zenoni, A. Zoccoli, G. Zosi | The \\phi\\pi^+/ \\omega\\pi^+ ratio from \\overline{n}p annihilations on a liquid hydrogen target, for \\overline{n} momenta between 64 and 297 MeV/c, was measured using the OBELIX spectrometer at LEAR. The ratio R(\\phi\\pi/ \\omega\\pi) = \\sigma(\\overline{n}p\\rightarrow \\phi\\pi^+)/ \\sigma(\\overline{n}p\\rightarrow\\omega\\pi^+) turned out 0.110\\pm0.015_stat \\pm 0.006_syst. Implications of this result on the OZI rule are discussed. |
| 334 | 1994-10-31 | Asymptotically, Free \\phi^4 Theory with Even Elements of a Grassmann Algebra | 1994 | LNF-94-064.pdf | F. Palumbo | Bilinear composities of anticommuting constituents are even elements of a Grassmann algebra, which are nilpotent commuting (NC) variables. We study a \\phi^4 theory where the \\phi field has NC Fourier components and we find that it is asymptotically free. |
| 331 | 1994-10-28 | Coherent Instabilities in Particle Accelerators: Conventional and Novel Approaches | 1994 | LNF-94-061(P).pdf | M. Migliorati, L. Palumbo | Recently, the Thermal Wave Model (TWM) has been proposed for describing the coherent instabilities in particle accelerators. It has been shown that the coasting beam stability criterion can be obtained as 'modulational stability' occurring in the propagation of an electromagnetic pulse in a nonlinear medium. Moreover, the TWM indicates the possible existence of soliton-like solutions. In this paper a review of the classical and TWM approaches is presented. |
| 330 | 1994-10-27 | Experimental Limits on Antigravity in Extended Supergravity | 1994 | LNF-94-060(P).pdf | S. Bellucci, V. Faraoni | The available tests of the equivalence principle constrain the mass of the Higgs-like boson appearing in extended supergravity theories. We determine the constrains imposed by the present and future high precision experiments on the antigravity fields arising from N = 2,8 supergravity. |
| 328 | 1994-10-26 | Room Temperature Oxidation of YBCO Thin-Film by µs Pulsed Electrolysis in Aqueous Solution. | 1994 | LNF-94-058(P).pdf | M. Boutet, D. Di Gioacchino, F. Celani, A. Spallone, P. Tripodi, M. Polichetti, P. Cocciolo, N. Sparvieri | In this paper the oxygen deficiency of YBa-2Cu-3O-7-(-x) films has been decreased at room temperature by the anodic oxidation in an aqueous solution of LiOH (0.3 N). The anodic oxidation of the films has been performed by \\mus pulsed electrolysis by means of short (1.3 \\mus) and high current peak (up to 15.2 A) with a low duty cycle at 5 KHz. The very high oxygen equivalent pressure on the electrode surface allows to increase the oxygen stoichiometry with a simple experimental set-up. The films have been characterized by the X-ray diffraction (XRD) and the temperature dependence of the dc resistivity. It appears that the pulsed electrolysis allows to enhance the critical temperature with a corresponding transition from the 'semiconducting' to the 'metallic' behaviour of the temperature dependence of the resistivity. |
| 329 | 1994-10-26 | AC Magnetic Susceptibility Measurements near the Superconducting Transition Temperature of YBCO Sintered Samples | 1994 | LNF-94-059(P).pdf | M. Polichetti, S. Pace, A. Saggese, A. M. Testa, C. Federico, F. Celani, M. Boutet, D. Di Gioacchino | The temperature dependence of the ac susceptibility of sintered YBCO pellets is experimentally analysed in detail few Kelvin below the transition temperature. The quite complex dependence of \\chi' and \\chi' on the frequency and the amplitude of the ac magnetic field cannot be explained by an ohmic Flux Flow or Critical State models, so that intermediate regimes or different non linear phenomena are to be considered. |
| 3997 | 1994-10-26 | Detection of High Energy Particles Stored in a Penning Trap | 1994 | INFN-BE_94-4.pdf | G. Testera, G. Drago, V. Lagomarsino, G. Manuzio | |
| 3998 | 1994-10-26 | A Set of Parametric Operators, Algebrically Defined for Real Time Data Processing | 1994 | INFN-BE_94-5.pdf | M. Bartolucci et al. | |
| 3986 | 1994-10-21 | Glueballs and Hybrids: an Experimental Review | 1994 | INFN-AE_94-25.pdf | A. Palano | |
| 3995 | 1994-10-21 | Spectroscopy of 88Y by Means of the 91Zr(p,a)88Y Reaction at 22 MeV | 1994 | INFN-BE_94-3.pdf | P. Guazzoni, et al. | |
| 4020 | 1994-10-20 | 99mTc Organ Doses Monitored by Whole Body Coounter | 1994 | INFN-TC_94-21.pdf | L. Torrisi, L. Barone Tonghi | |
| 326 | 1994-10-04 | Calcium Environment in Omphacitic Pyroxenes : XANES Experimental Data One Electron Multiple Scattering Calculations | 1994 | LNF-94-056(P).pdf | E. Paris, Ziyu Wu, A. Mottana, A. Marcelli | One-electron multiple scattering calculations have been used to determine the calcium local enviroment in three pyroxenes (diopside, intermediate ordered omphacite, and jadeite-rich disordered omphacite) starting from their crystal structure data. The calculated Ca K-edge spectra agree well with the experimental X-ray absorption XANES spectra. The overall comparison of theory and experiment supports the model that in omphacite Ca distributes over two inequivalent sites, one with the same geometry as the Ca site in diopside, and the second one with that of Na in jadeite. The comparison of the measured XANES spectra with ab-initio calculated ones allows the achievement of full understanding of experimentally observed features and from them the crystal-chemical behaviour of individual cations present in a mineral structure is also determined. |
| 327 | 1994-10-04 | An Infrared Synchrotron Radiation Beamline on DAFNE | 1994 | LNF-94-057.pdf | E. Burattini, G. Cappuccio, A. Marcelli, P. Calvani, A. Nucara, M. Sànchez del Rìo | DAPHNE, the new storage ring under construction at Frascati, can also be used as a powerful synchrotron radiation source in the infrared domain, where it is more brilliant than a blackbody. Ray-tracing calculations of different optical setups at different wavelengths are reported. |
| 3985 | 1994-10-03 | Proc. of the: Intern. School of Physics of Exotic Atoms – 6th Workshop: Exotic Atoms, Molecules and Their Interactions (Erice, Sicily, Italy, 21–30 March 1994) | 1994 | INFN-AE_94-24.pdf | Edited by C. Rizzo, E. Zavattini | |
| 321 | 1994-09-26 | QED Two Photon Width of hc | 1994 | LNF-94-051(P).pdf | N. Fabiano, G. Pancheri | We discuss the recent measured partial width of the pseudoscalar charmonium, \\eta-c, into two photons. Predictions for potential models are examined and compared with experimental values. Including radiative corrections, it is found that present measurements are compatible both with a QCD type potential and with a static Coulomb potential, with \\alpha-s evaluated at two loops. |
| 322 | 1994-09-26 | The Effect of Hydrogen Absorption on the Cerium Electronic State in CeFe11Ti: an X-Ray Absorption and Circular Magnetic Dichroism Investigation | 1994 | LNF-94-052(P).pdf | J. Chaboy, A. Marcelli, L. Bozukov, F. Baudelet, E. Dartyge, A. Fontaine, S. Pizzini | We present a combined X-Ray Absorption Spectroscopy (XAS) and X-Ray Circular Magnetic Dichroism (XCMD) study performed on the CeFe-11TiHx systems. Looking at the changes of the local structure around the metal atoms by EXAFS (Extended X-Ray Absorption Fine structure), the crystallographic position occupied by hydrogen in these compounds has been inferred. Moreover, the influence of hydrogen into the intermediate-valence state of Ce and the electronic localization is discussed. Both XAS and XCMD results evidence the strong correlation between the structural and magnetic changes associated with the modification of the hybridization between the Fe(3d) and Ce(5d) bands. |
| 323 | 1994-09-26 | Source Size and Brilliance of Infrared Radiation Emitted by a Bending Magnet of DAFNE | 1994 | LNF-94-053(IR).pdf | A. Nucara, P. Calvani, A. Marcelli, M. Sànchez Del Rio | The Actual Source Area (ASA) of a bending magnet in the infrared range, has been calculated for the \\Phi-factory DAPHNE under construction at Frascati. 'Geometrical' broadening has been included. The Actual Brilliance Ratio (ABR) defined as the ratio between the brilliance of a synchrotron source and that of a blackbody, has been also evaluated for DAPHNE and compared with the Brookhaven NSLS source. |
| 324 | 1994-09-26 | Radiation Protection Problems Around the Positron Converter of the DAFNE Machine Project | 1994 | LNF-94-054(P).pdf | A. Esposito | One of the most important radiation protection problems involved with a high energy particle accelerator concerns the exposure of personnel to \\beta and \\gamma radiations from the components of the machine exposed to primary beams (beam dunps, targets, collimators etc.). The aim of this paper is to set a scale of amount of activity induced in the DAPHNE positron converter and to calculate the expected photon dose rate. |
| 325 | 1994-09-26 | DAFNE Machine Project | 1994 | LNF-94-055(P).pdf | A A. V V. | The main accelerators physics and technology issues of electron-positron \\Phi-Factories are discussed. Advantages and drawbacks of possible colliding schemes are reviewed. The most relevant technological issues at DAPHNE, now under construction at LNF, are discussed. |
| 4018 | 1994-09-26 | Sistema di Reticolo di una Miscela di Gas in una Camera a Fili, con Controllo del Flusso, della Pressione e del Rapporto Percentuale della Miscela | 1994 | INFN-TC_94-19.pdf | E. Barbarito, F.P. Ceglie, M. Franco, R. Liuzzi, M. Mongellin, M. Perchiazzi, A. Rainò, A. Sacchetti | |
| 4019 | 1994-09-26 | Realizzazione di un Correlatore per Caratterizzazione di Microparticelle Solide | 1994 | INFN-TC_94-20.pdf | V. Capozzi, L. Dell'Olio, N. Facchini, D. Lojacono, G.F. Lorusso | |
| 320 | 1994-09-23 | Lee–Yang Zeros and the Chiral Phase Transition in Compact Lattice QED | 1994 | LNF-94-050(P).pdf | V. Azcoiti, I. M. Barbour, R. Burioni, G. Di Carlo, A. F. Grillo, G. Salina | In this paper we present a detailed study of the phase structure in the \\beta-m plane for Compact Lattice QED. We analyse the scaling properties of the distribution of the partition function zeros in the complex fermion mass plane 4^4, 6^4, 8^4 and 10^4 lattices. The partition function is numerically evaluated by using two independent methods, based respectively on a standard HMC (Hybrid Monte Carlo) and on an alternative approach derived from the MFA (Microcanonical Fermionic Average). The finite size scaling behaviour gives strong indications for a first order phase transition at any value of the fermion mass. The reliability of the result follows from the remarkable agreement between the two independent methods. |
| 4017 | 1994-09-23 | Performance of Resistive Plate Counters with Low Percentage of Isobutane | 1994 | INFN-TC_94-18.pdf | V. Arena, G. Boca, M. Cambiaghi, G. Gianini, G. Introzzi, G. Liguori, S. Ratti, C. Riccardi, P. Torre, L. Viola, P. Vitulo | |
| 317 | 1994-09-22 | High Performance Tracking with Long Straw Tubes Using Dimethyl Ether | 1994 | LNF-94-047(IR).pdf | L. Benussi, M. Bertani, S. Bianco, F. L. Fabbri; P. Gianotti, M. Giardoni, C. Guaraldo, A. Lanaro, V. Lucherini, A. Mecozzi, L. Passamonti, V. Russo, S. Sarwar | A cylindrical tracking detector with an inner radius of one meter employing straw tubes is being envisaged for the FINUDA experiment aimed at hyper-nuclear physics at DAPHNE, the Frascati \\phi-factory. A prototype using sevral 10mm and 20mm diameter, two meter long aluminized mylar straws has been assembled and tested with a one GeV/c pion beam. While operating with dimethyl ether gas gain, space resolution, and device systematics have been studied.A simple method of correction for systematics due to straw eccentricity has been developed and, once applied, a space resolution better than 40\\mu m can be reached. |
| 318 | 1994-09-22 | Study of the High Energy Cosmic Ray Cascades Using the Dual Parton Model | 1994 | LNF-94-048(P).pdf | G. Battistoni, C. Forti, J. Ranft | In this paper we describe an application of the two component Dual Parton Model, for the simulation of high energy Cosmic Ray Cascades. The DPMJET interaction model has been tuned to accelerator data for hadron-nucleus and nucleus-nucleus interactions, and its performance in the fragmentation region has been optimized. We make use of this generator inside the HEMAS shower code. Results are presented with particular emphasis of the electromagnetic component and on the high energy muon content of the showers. |
| 319 | 1994-09-22 | Construction and Performance of the Lead–Scintillating Fiber Calorimeter Prototypes for the KLOE Detector | 1994 | LNF-94-049(P).pdf | A. Antonelli, M. Antonelli, G. Barbiellini, M. Barone, S. Bertolucci, S. Bianco, C. Bini, C. Bloise, V. Bolognesi, F. Bossi, P. Campana, F. Cervelli, R. Caloi, M. Cordelli, G. De Zorzi, G. Di Cosimo, A. Di Domenico, O. Erriquez. F. L. Fabbri, A. Farilla, A. Ferrari, P. Franzini, F. Garufi, P. Gauzzi, E. Gero, S. Giovannella, R. Haydar, M. Incagli, L. Keeble, W. Kim, G. Lanfranchi, J. Lee - Franzini, A. Martini, A. Martinis, S. Miscetti, F. Murtas, A. Parri, A. Passeri, S. Sarwar, F. Scuri, E. Spiriti, L. Tortora, X. L. Wang, S. Wölfle | The KLOE detector is designed primarily for the study of direct CP violation in K^0 decays. The electromagnetic calorimeter, EmC, is a most demanding element of the detector. Two prototypes of the EmC (one for the barrel and one for the end-cap region) have been built at Frascati and tested at PSI (Switzerland) using beams of electrons, muons and pions of 40 to 290 MeV/c momentum, and at the Frascati LADON facility using photons of 20 to 80 MeV. We observe excellent linearity from 20 to 290 MeV. The energy resolution is \\sigma(E)/E\\sim4.4%\\sqrt{E(GeV)} and the time resolution is \\sim34ps/ \\sqrt{E(GeV)}. We found little dipendence on incidence angle and entry position. We also determined that some \\pi/ \\mu identification is possible. |
| 5723 | 1994-09-22 | A MULTIPLICATIVE BACKGROUND FIELD METHOD. | 1994 | INFN-AE-94-23.pdf | R. Floreanini, R. Percacci. | We propose that instead of the usual additive decomposition of the metric into a classical background and a quantum fluctuation, one should use a multiplicative parametrization. This, together with a discussion of the dimensions of the quantities involved, leads naturally to a nonstandard approach to quantum gravity, which appears to be effectively a bimetric theory. We discuss some results of this approach, applied to the most general lagrangian with terms up to second order in curvature and torsion. |
| 3983 | 1994-09-21 | Consequences of the Existence of the Infrared Background in Addition to the Microwave Background for the Future High Energy y–Rays Experiments | 1994 | INFN-AE_94-22.pdf | A Morselli | |
| 3981 | 1994-09-20 | Study of Charmed Meson States Photoproduced at High Energy at Fermilab | 1994 | INFN-AE_94-20.pdf | G. Bellini | |
| 4014 | 1994-09-15 | Evaluation and First Measurement of the Gas Pressure Drop of the CMS Microstrip Gas Chambers | 1994 | INFN-TC_94-15.pdf | M. Bozzo, A. Morelli, M.Olcese | |
| 4015 | 1994-09-15 | A Case for a Baryonic Dark Halo | 1994 | INFN-TC_94-16.pdf | F. De Paolis, G. Ingrosso, P. Jetzer, M. Roncadelli | |
| 4016 | 1994-09-15 | A Possibile Scenario for a Baryonic Dark Halo | 1994 | INFN-TC_94-17.pdf | F. De Paolis, G. Ingrosso, P. Jetzer, M. Roncadelli | |
| 316 | 1994-09-13 | The Geometrical Picture and Bremsstrahlung Analogy in Diffraction of High Energy Hadrons | 1994 | LNF-94-046(P).pdf | E. Etim, Malecki , M. Pallotta | The common probabilistic roots of the geometrical models of hadron diffraction and of the Bloch-Nordsieck theory of soft Bremsstrahlung are discussed. Their close relationship is best visible in the Chou-Yang model generalized to four dimensions. An interesting complementarity of the two descriptions in reproducing elastic scattering of high energy hadrons is pointed out. |
| 315 | 1994-09-09 | Composite Operators as Integration Variables in Berezin Integrals | 1994 | LNF-94-045(IR).pdf | G. De Franceschi, F. Palumbo | we define nonlinear changes of variables in Berezin integrals, assuming as new integration variables multilinear functions of the defining elements of the Grassmann algebra. We apply such a change of variables to QCD by introducing as integration variables trilinear and bilinear functions of the quark field, with the quantum numbers of the nucleon and the meson respectively, and we suggest a perturbative scheme using these functions as free states. |
| 314 | 1994-09-08 | Theoretical Analysis of X–Ray–Absorption near–Edge Structure at the Mg K Edge in Forsterite, Mg2SiO4–Pbnm, Under Extreme Conditions | 1994 | LNF-94-044(P).pdf | Z. Y. Wu, A. Marcelli, C. R. Natoli, A. Mottana, E. Paris | We calculated the Mg K edge X-ray absorption spectra of forsterite both for the M1 and M2 sites and for the overall edge by using the one-electron multiple-scattering theory. The validity of the theoretical model is well illustrated by comparison of calculations with experimental data at the Mg K edge of MgO (periclase). Based on these results, XAS experiments at the Mg K edge of forsterite are suggested, in as much as calculations performed up to 1020 Celsius and 149 kbar indicate variation of fine structures in the multiple scattering region. We show for the first time that the information, which can be obtained by using this spectroscopy have implications on the structure of the Earth's upper mantle. |
| 5722 | 1994-09-07 | A SCINTILLATING-FIBER HODOSCOPE WITH MULTI-ANODE PHOTOMULTIPLIER READOUT. | 1994 | INFN-AE-94-19.pdf | L. Lanceri, G. Vuagnin. | Position sensitive photomultipliers coupled to scintillating fibers allow the construction of compact and fast particle tracking detectors. We describe a detector based on these techniques, and discuss its measured performances. Efficiency, space resolution and the effects of cross-talk between neighbour channels are studied in detail. |
| 4012 | 1994-09-07 | Digital Mammography with Synchrotron Radiation | 1994 | INFN-TC_94-13bis.pdf | F. Arfelli, G. Barbiellini et al. | |
| 4013 | 1994-09-07 | Junction and Interstrip Capacitance of Silicon Microstrip Detectors | 1994 | INFN-TC_94-13.pdf | V. Bonvicini, M. Prest, N. Zampa | |
| 3979 | 1994-09-07 | The GILDA Mission: A New Technique for a Gamma-Ray Telescope in the Energy Range 20 MeV – 100 GeV | 1994 | INFN-AE_94-18.pdf | G. Barbiellini, M. Boezio, M. Casolino, M. Candusso, M.P. De Pascale, A. Morselli, P. Picozza, M. Ricci, R. Sparvoli, P. Spillantini, A. Vacchi | |
| 309 | 1994-09-05 | Radiative Vector-Meson Decays in SU(3) Broken Effective Chiral Lagrangians | 1994 | LNF-94-039(P).pdf | A. Bramon, A. Grau, G. Pancheri | Conventional SU(3)-breaking effects are shown to be easily introduced in the sector of effective chiral lagrangians incorporating vector mesons and containing the VVP vertices related to the anomaly. An improved description of VP\\gamma and P\\gamma\\gamma transitions is obtained. |
| 310 | 1994-09-05 | Effective Chiral Lagrangians with an SU(3)–Broken Vector–Meson Sector | 1994 | LNF-94-040(P).pdf | A. Bramon, A. Grau, G. Pancheri | The accuracy of effective chiral lagrangians including vector-mesons as (hidden symmetry) gauge fields is shown to be improved by including SU(3)-breaking in the vector-meson sector. The masses (Mv), coupling to the phton field (fv\\gamma) and pseudoscalar pairs (gvpp) are all consistently described in terms of two parameters, which also fit the values for the pseudoscalar decay constants, fp, and charge radii, <r^2p>. The description of the latter is further improved when working in the context of chiral perturbation theory. |
| 311 | 1994-09-05 | Wake Fields and Impedance | 1994 | LNF-94-041(P).pdf | L. Palumbo, V. G. Vaccaro, M. Zobov | Knowledge of the electromagnetic interaction between a beam and the surrounding vacuum chamber is necessary in order to optimize the accelerator per-formance in terms of stored current. Many instability phenomena may occur in the machine because of the fields produced by the beam and acting back on itself as in a feedback device. Basically, these fields produce an extra voltage and energy gain, affecting the longitudinal dynamics, and a transverse momentum kick which deflects the beam. In this paper we describe the main features of this interaction with typical machine components. |
| 312 | 1994-09-05 | Status of DAFNE and its Physics Program | 1994 | LNF-94-042(P).pdf | J. Lee - Franzini | An e^+e^- collider optimized for operation at a total energy of 1019.4 MeV, the mass of the \\phi meson, christened DAPHNE, is now under construction at the Laboratori Nazionali di Frascati of the INFN.Here we report on DAPHNE's present status. We discuss its particle physics program, which include CP violation and other symmetry studies, tests of chiral perturbation calculations and light meson spectroscopy. The general purpose detector, KLOE, being built for performing these experiments, is described. DAPHNE has also a nuclear physics program for studing K-meson interactions and hyperon physics. A sketch of the detector dedicated to these studies, FI.NU.DA., is likewise included. |
| 313 | 1994-09-05 | Local Structure of L 12–Ordered Ni75(Al1–xFex)25 Alloys | 1994 | LNF-94-043.pdf | S. Pascarelli, F. Boscherini, S. Mobilio, K. Lawniczak - Jablonska, R. Kozubski | We present an Fe and Ni K-edge extended x-ray-absorption fine structure study of the L1_2-ordered ternary alloy Ni_75(Al_1-xFe_x)_25. We find that Fe enters predominantly the Al sublattice of Ni_3Al(\\gamma' phase). The distribution of Fe and Al atoms on this sublattice follows the expected distribution for an L1_2 structure. The Fe nearest-neighbor distances are consistent with the measured lattice parameters. The first coordination shell around Ni is composed of Ni, Fe, and Al atoms. The Ni-Ni and Ni-Fe bond lengths are consistent with diffraction data. On the other hand, an unexpected strong (\\approx 0,2A) decrease of the Ni-Al distance with increasing Fe content is detected, the Ni-Al bond being also characterized by a large disorder. This result provides a local structural explanation to the large lattice strains recently measured in similar samples by x-ray diffraction. |
| 3978 | 1994-09-05 | Predictions in the Pseudoscalar Channel of Charmonium by Means of QCD Sum Rules | 1994 | INFN-AE_94-17.pdf | E. Di Salvo, M. Pallavicini | |
| 308 | 1994-07-21 | QED Radiative Corrections and Radiative Bhabha Scattering at DAFNE | 1994 | LNF-94-038(P).pdf | M. Greco, G. Montagna; O. Nicrosini, F. Piccinini | Some basic issues of the electromagnetic radiative corrections to e^+e^- collisions at DAPHNE energies are reviewed in the framework of the QED structure function approach. Illustrative numeral results for the \\Phi line-shape and leptonic pair production over a realistic experimental set-up are given. A phenomenological analysis of radiative Bhabha scattering, with particular emphasis on the very forward region, is also addressed. Predictions for the tagging configurations of interest for the two-photon physics at DAPHNE are given and compared with previous and very recent calculations. |
| 4011 | 1994-07-21 | Silicon Detectors for Synchrotron Radiation Digital Mammography | 1994 | INFN-TC_94-12.pdf | F. Arfelli, G. Barbiellini et al. | |
| 307 | 1994-07-20 | gg Æ p0p0 and h Æ p0 gg at Low Energy Within the Extended Nambu Jona–Lasinio Model | 1994 | LNF-94-037(P).pdf | S. Bellucci, C. Bruno | Within the Extended Nambu Jona-Lasinio model, we calculate the O(p^6) counterterms entering the low-energy expansion of the \\gamma\\gamma \\rightarrow \\pi^0\\pi^0 and the \\eta \\rightarrow \\pi^0\\gamma\\gamma amplitudes in Chiral Perturbation Theory. For \\gamma\\gamma \\rightarrow \\pi^0\\pi^0 our results are compatible with both the experimental data and the two-loop calculation using meson resonance saturation. For the \\eta decay we find \\Gamma(\\eta \\rightarrow \\pi^0\\gamma\\gamma) = 0,58+-0,3 eV which is in agreement with experiment within one standard deviation. We also give predictions for the neutral pion polarizabilities and compare them with the results obtained from resonance saturation. |
| 3977 | 1994-07-19 | Introduction into the Monte–Carlo Method | 1994 | INFN-AE_94-16.pdf | I. Manno | |
| 306 | 1994-06-29 | Analysis of Optical Transition Radiation Emitted by a 1 MeV Electron Beam and its Possible Use as Diagnostic Tool | 1994 | LNF-94-036(P).pdf | M. Castellano, M. Ferrario, S. Kulinski, M. Minestrini, P. Patteri, F. Tazzioli, L. Catani, L. Gregorini, S. Tazzari | The main features of Optical Transition Radiation (OTR) backward emitted by a 1 MeV electron beam crossing a vacuum-to-metal boundary are presented. The possible use of OTR as a diagnostic tool for such a low energy beam is discussed, and some preliminary experimental data are presented. |
| 3976 | 1994-06-27 | Precise Measurements of Drift Velocities in Helium Gas Mixture | 1994 | INFN-AE_94-15.pdf | P. Bernardini, G. Fiore, R. Gerardi, F. Grancagnolo, U. von Hagel1, F. Monittola, V. Nassisi, C. Pinto, L. Pastore, M. Primavera | |
| 305 | 1994-06-24 | The Dual Parton Model at Cosmic Ray Energies | 1994 | LNF-94-035(P).pdf | J. Ranft | The Dual Parton Model for hadron-hadron, hadron-nucleus and nucleus-nucleus collisions is studied in the fragmentation region up to the Cosmic Ray energy region. Due to the excellent Feynman scaling behaviour of the model outside the regions around x_f = 1. and x_f = 0. , it is found, that accelerator data in the fragmentation region are indeed relevant for the Cosmic Ray energy region. However, not enough data are available in the fragmentation region of hadron collisions with light target nuclei. Therefore many features of hadron production in collision involving nuclei can only be extracted from the study of models. |
| 303 | 1994-06-17 | EURODAFNE Collaboration Meeting – (Frascati, 19–22 April , 1994) | 1994 | LNF-94-033(IR).pdf | A A. V V. | |
| 302 | 1994-06-14 | Measurement of the Electromagnetic Form Factor of the Proton in the Time–Like Region | 1994 | LNF-94-032(P).pdf | A. Antonelli, R. Baldini, M. Bertani, M.E. Biagini, V. Bidoli, C. Bini, T. Bressani, R. Calabrese, R. Cardarelli, R. Carlin, C. Casari, L. Cugusi, P. Dalpiaz, A. De Falco, G. De Zorzi, A. Feliciello, M. L. Ferrer, P. Ferretti, P. Gauzzi, P. Gianotti, E. Luppi, S. Marcello, A. Masoni, R. Messi, M. Morandin, L. Paoluzi, E. Pasqualucci, G. Pauli, N. Perlotto, F. Petrucci, M. Posocco, G. Puddu, M. Reale, L. Santi, R. Santonico, P. Sartori, M. Savriè, S. Serci, M. Spinetti, S. Tessaro, C. Voci, F. Zuin | The cross section for the process e^+e^- \\rightarrow p\\overline{p} has been measured in the s range 3.6\\div5.9 GeV^2 by the FENICE experiment at the e^+e^- Adone storage ring and the proton electromagnetic form factor has been extracted. |
| 4010 | 1994-06-14 | La Scheda Zero Suppressor per il Trigger di Muoni con RPC dell'Esperimento L3 | 1994 | INFN-TC_94-11.pdf | A. Aloisio, A. Bove, F. Cevenini, L. Parascandalo, S. Patricelli | |
| 3993 | 1994-06-14 | Frequency Locking of a Nd:YAG Laser Using the Laser Itself ad the Optical Phase Modulator | 1994 | INFN-BE_94-2.pdf | G. Cantatore et at. | |
| 3996 | 1994-06-14 | Linear Processes that Produce 1/f or Flicker Noise | 1994 | INFN-FM_94-3.pdf | E. Milotti | |
| 301 | 1994-06-09 | The Hadronic Vacuum Polarization Contribution to the Muon g–2 in the Quark–Resonance Model | 1994 | LNF-94-031(P).pdf | E. Pallante | The hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon is parametrized by using the quark resonance model formulated in ^[1]. In this context a recent prediction obtained within the ENJL model[2] can be affected by two addictional contributions: the next to leading corrections in the inverse cutoff expansion and the gluonic corrections. Motivated by the necessity of reaching a highly accurate theoretical prediction of the hadronic contribution to the muon g-2, we study in detail both the effects. |
| 298 | 1994-06-03 | The KLOE Central Drift Chamber (Addendum to the KLOE Technical Proposal) | 1994 | LNF-94-028(IR).pdf | KLOE - Collaboration | We present in the following a design of the central tracking chamber for the KLOE detector. Included are extensive report on test results gleaned from prototype tests, experience with construction of a full length sector prototype, and detailed reports on simulation of the chamber performances. |
| 299 | 1994-06-03 | Absolute Total Photoabsorption Cross Sections on Nuclei in the Nucleon Resonance Region | 1994 | LNF-94-029.pdf | N. Bianchi V. Muccifora E. De Sanctis A. Fantoni P. Levi Sandri, V. Lucherini, E. Polli, A. R. Reolon , P. Rossi, M. Anghinolfi, P. Corvisiero, L. Mazzaschi, V. Mokeev, G. Ricco, M. Ripani, M. Sanzone, M. Taiuti, A. Zucchiatti | We present the results of an absolute measurement of the photoabsorption cross section on Li, C, Al, Cu, Sn, and Pb between 300-1200 MeV. In the \\Delta region our result confirm that the strength is converted, while in the higher resonances region they show a 7-15% damping and a possible mass-number dependence of the photoabsorption cross section. |
| 300 | 1994-06-03 | Influence of Double–Electron Transitions on the EXAFS L Edges of Rare-Earth Systems | 1994 | LNF-94-030.pdf | J. Chaboy, A. Marcelli, T. A. Tyson | This work presents an x-ray-absorption study at the L edges of several rare-earth compounds. In both L_1-edge and L_3edge spectra, anomalous features are clearly detected in the EXAFS region and have been associated with the creation of 2s4d and 2p4d double-core hole states, respectively. Comparison of theoretical calculations with the experiments are carried out using the results of explicit computation of cross sections for the allowed mainline (L edge) and double-electron (LN_4,5 edges) which identify the transitions expected to be observable. In addition, the excitation energies of all of these allowed transitions are given. The influence of multielectron transitions on the EXAFS data analysis is discussed for several rare-earth-based systems. An estimated of the error introduced by neglecting the presence of double-electron transitions on coordination numbers and bond distances is given, based on these experimental data. |
| 297 | 1994-05-31 | Authomatic Alignment System for a Michelson Interferometer | 1994 | LNF-94-027(IR).pdf | D. Babusci, H. Fang, G. Giordano, G. Matone, V. Sannibale | |
| 4009 | 1994-05-19 | Camac Battery Power Supply for Silicon Detectors | 1994 | INFN-TC_94-10.pdf | M. Gregori, N. Zampa | |
| 4008 | 1994-05-16 | Silicon X-Ray Detector for Synchrotron Radiation Digital Radiology | 1994 | INFN-TC_94-9.pdf | F. Arfelli, G. Barbiellini | |
| 3975 | 1994-05-11 | Study in a High Magnetic Field of Hamamatsu R2149 Tetrodes for the DELPHI Stic Calorimeter | 1994 | INFN-AE_94-14.pdf | M. Bonesini, S. Gumenyuk, M. Paganoni, A. Pasta, T. Tabarelli, G. Baccaglioni, L. Rossi, G. Volpini | |
| 4007 | 1994-05-09 | Realizzazione di un Banco di Prova per Barre di Scientillatore Plastico con Lunghezza fino a 5 Metri | 1994 | INFN-TC_94-8.pdf | M. Taiuti, M. Castoldi, P. Cocconi, F. Parodi, A. Rottura | |
| 3991 | 1994-05-06 | Complex – Barrier Tunnelling Times | 1994 | INFN-BE_94-1.pdf | F. Raciti, G. Salesi | |
| 4006 | 1994-05-06 | Attività di Sperimentazione sulla Rete MAN Pubblica di Trieste | 1994 | INFN-TC_94-7.pdf | M. Petri, D. Della Giustiana, R. Gomezel | |
| 293 | 1994-05-02 | A Cosmic-Ray Veto System for the Gravitational Wave Detector Nautilus | 1994 | LNF-94-023(P).pdf | E. Coccia, A. Marini, G. Mazzitelli, G. Modestino, F. Ricci, F. Ronga, L. Votano | The ultracryogenic resonant gravitational wave antenna NAUTILUS now operating at Frascati INFN National Laboratory has been provided with a cosmic-ray veto system consisting of layers of streamer tubes. The experimental setup eand performances of the system are shown. Preliminary results on the data collected during the calibration operations of the antenna are also presented together with the expected number of events from the interactions of hgh-energy hadrons and muons and multihadron showers with the gravitational antenna. |
| 294 | 1994-05-02 | J/y Production Via Fragmentation at the Tevatron | 1994 | LNF-94-024(P).pdf | M. Cacciari, M. Greco | The production of J/ \\psi at large transverse momenta (p\\perp > M_J/ \\psi) in p\\bar{p} collisions is considered by including the mechanism of fragmentation. Both contributions of fragmentation to J/ \\psi and of fragmentation to X states followed by radiative decay to J/ \\psi are taken into account. The latter is found to be dominant and larger than direct production. The overall theoretical estimate is shown to be nearly consistent with the experimental observation. |
| 295 | 1994-05-02 | The Microcanonical Fermionic Average Method for Asymptotically Free Theories: a Test in the Schwinger Model | 1994 | LNF-94-025.pdf | V. Azcoiti, G. Di Carlo, A. Galante, A. F. Grillo, V. Laliena | We have applied the Microcanonical Fermionic Average method to QED_2 i.e. the Schwinger Model, to test its applicability to Asymptotically Free Theories. We present here the results of the simulations, compared to the continuum results. Since the M.F.A. method allows the study of the whole \\beta, m_f plane at very small computer cost, we are able to verify the scaling of the chiral condensate at a high degree, and obtain the continuum result within 3 decimal places. We present also results for the plaquette energy. |
| 296 | 1994-05-02 | Photoproduction of High–pT Jets in Next-toLeading Order QCD | 1994 | LNF-94-026.pdf | M. Greco, A. Vicini | The photoproduction of high p_\\tau jets at HERA energies is considered in next-to-leading order perturbative QCD. The cancellation of O(\\alpha_cm\\alpha^2_s) dependence of the cross section on the factorization scale M_\\gamma of the collinear singularities of the photon is shown expliticitly to occur when the direct and resolved photon terms are both considered. A detailed numerical analysis is presented and compared with previous studies, showing that the theoretical predictions are affected by large uncertainties related to the poorly known photon structure functions. Sizeable numerical differences in the analyses published so far are also emphasised. |
| 292 | 1994-04-28 | The Hewlett Pakard Cluster Configuration | 1994 | LNF-94-022(NT).pdf | M. Carboni | The increasing request of computing power coming from High Energy physics has determined the interest of the Scientific Community toward the RISC technology, that in the last years is substituing the CISC technology.Hewlett Packard Company offers the workstation family HP 9000/7xx, with architecture RISC, operating under HP-UX, based on Unix. In this note the hardware and software configuration of the L.N.F. HP 9000/7xx cluster is shown together with the system adopted implementation, the Cluster Operating System and the Software Configuration. |
| 291 | 1994-04-27 | First Results about Hydrogen Loading by Means of Pulsed Electrolysis of Y1Ba2Cu3O7 Pellets | 1994 | LNF-94-021(P).pdf | F. Celani, M. Boutet, D. Di Gioacchino, A. Spallone, P. Tripodi, S. Pace, M. Polichetti, P. Marini | Y1Ba2Cu3(YBCO) sintered pellets have been loaded at room temperature with hydrogen by means of electrolysis in an acqueous solution (LiOH 0,3 N) with \\mus current pulses. The superconducting features of loaded samples have been measured as a function of the temperature by the ac magnetic susceptibility. In some conditions the YBCO pellets exhibited an enhancement of the transition temperature up to 95,4 K without a significant weakening of the superconducting grain coupling. These effects appear strongly dependent on the loading conditions. |
| 4005 | 1994-04-26 | Phototubes Support Structure for the Prototypeof the Borexino Detector | 1994 | INFN-TC_94-6.pdf | Danilo Giugni, Ferdinando Mariani Andrea Garagiola | |
| 4004 | 1994-04-22 | Status Report of the INFN R&D Activities for Al-Stabilised Conductors of Large Magnets for LHC Deterctors | 1994 | INFN-TC_94-5.pdf | R.De Lorenzi, P.Fabbricatore, S.Farinon, G.Gemme, R.Musenich, R.Parodi, S.Pepe and B.Zhang | |
| 4003 | 1994-04-12 | The Upgrading of the SERSE Project | 1994 | INFN-TC_94-4.pdf | G. Ciavola, S. Gammino | |
| 3973 | 1994-04-08 | Field Theory of the Spinning Electron: I – Internal Motions | 1994 | INFN-AE_94-12.pdf | G. Salesi, E. Recami | |
| 3974 | 1994-04-08 | Field Theory of the Spinning Electron: II – The New, Non–Linear Field Equations | 1994 | INFN-AE_94-13.pdf | G. Salesi, E. Recami | |
| 287 | 1994-03-29 | Two – Photon Reactions Beyond One – Loop | 1994 | LNF-94-017(P).pdf | S. Bellucci | We review the recent progress in the calculation of the amplitude for \\gamma\\gamma \\rightarrow \\pi0\\pi0 to two loops in chiral perturbation theory. We match the low-energy amplitude in chiral perturbation theory with the result of the dispersion theoretic analysis. The neutral pion polarizabilities are also given to two-loop accuracy. Then, the results are compared with the dispersion relation calculation of the pion polarizabilities. |
| 288 | 1994-03-29 | On the Convergence of the Inverse Diffraction Transform Kernel Using Cesàro Summability | 1994 | LNF-94-018(P).pdf | M. Pallotta | In tomography, optical information processing and, more generally, Fourier optics, the diffraction transform solves both the direct and the inverse boundary value propagation problem for the Helmholtz equation. Its kernel is itself an integral. It is the representation of the evolution operator associated with translations of a constrained Cartesian coordinate. This fact threatens the inverse scattering problem with a divergenze if the transform kernel is understood as a Cauchy integral. The kernel is, however, everywhere convergent if its integral representation is interpreted as a Cesa'ro summable integral. |
| 289 | 1994-03-29 | Interaction of Cesium Overlayers with Oxygen by Means of X–Ray Absorption | 1994 | LNF-94-019.pdf | M. Benfatto, M. Pedio, S. Aminpirooz, J. Haase | |
| 290 | 1994-03-29 | Status of the Commissioning of the SC Linac LISA for 'SURF' FEL Experiment | 1994 | LNF-94-020.pdf | M. Castellano, M. Ferrario, M. Minestrini, P. Patteri, F. Tazzioli, F. Cevenini, F. Ciocci, G. Dattoli, A. DiPace, G. P. Gallerano, A. Renieri, E. Sabia, L. Catani, S. Tazzari | The construction of the superconducting linac LISA and the transport line to the 25 MeV spectrometer has been completed in July. The commissioning of the whole machine will be carried on starting in September. The installation of the 25 MeV arc to the undulator will be completed by December. Up to now successfully rf power tests and conditioning of 3 out of 4 modules compousing the superconducting accelerator have been accomplished. Conditioning is to be continued also the improve the present results (\\sim 4MeV/m at 25% duty cycle) limited by intense X-ray enission. A technique to measure the quality factor Q_0 by on-line LHe level measurement has been devised [1], taking into account the complex behaviour of LHe in the loop-controlled cryogenic system. The peculiarity of this behaviour is the onset of coupled pressure, temperature and density oscillations which make the LHe evaporated mass evaluation a very indirect measurement. |
| 5721 | 1994-03-29 | AVERAGE EFFECTIVE POTENTIAL FOR THE CONFORMAL FACTOR. | 1994 | INFN-AE-94-11.pdf | R. Floreanini, R. Percacci. | We discuss a method of quantization which produces a nontrivial effective potential for the conformal factor of the metric, both in the case of matter fields propagating in a fixed background geometry, and in the case of pure gravity. In particular, using the method of the average effective potential we compute the scale dependence of the conformal factor. We offer some speculations on the possible significance of this result. |
| 286 | 1994-03-18 | X–Ray Circular Magnetic Dichroism as a Probe of Spin Reorientation Transitions in Nd2Fe14B and Er2Fe2Fe14B | 1994 | LNF-94-016(P).pdf | J. Chaboy, A. Marcelli, L. M. Garcìa, J. Bartolomé, M. D. Kuz'min, H. Maruyama, K. Kobayashi, H. Kawata, T. Iwazumi | We present the first experimental observation of spin reorientation phase transitions (SRT) with the X-Ray Circular Magnetic Dichroism (XCMD) technique. The XCMD signal, related to the protection of the rare earth moment on the direction of the x-ray beam, has been measured as a function of temperature of both, a first-order SRT in Er2Fe14B (abrupt reorientation by 90 degrees) and a second-order one in Nd2Fe14B, (continuous tilt of the magnetization from the c-axis). The feasibility of this technique to study SRTs is demonstrated, resulting in a better understanding of the magnetic behavior of intermetallic compounds exhibiting coexistence of itinerant and localized magnetism. |
| 285 | 1994-03-16 | Simulation of the Electro–Magnetic Component of Extensive Air Showers | 1994 | LNF-94-015(P).pdf | V. Patera, M. Carboni, G. Battistoni, A. Ferrari | The e.m. component of Extensive Air Showers, as a sampled at a given atmospheric depht, may be considered as the superposition of sub-showers initiated by photons and electrons (positrons) mainly coming from the decay of secondary mesons. A detailed simulation of showers in atmosphere as produced by gammas and electrons has been performed by means of standard high energy physics Monte Carlo codes. We developed a set of parametrisations of these sub-showers to be included in the full simulations of Extensive Air Showers with the aim to reduce the required computer power. Comparison with previous results found in the literature are shown. |
| 5720 | 1994-03-10 | SINGULAR VECTORS OF <i>W</i> ALGEBRAS VIA DS REDUCTION OF <a href='https://www.codecogs.com/eqnedit.php?latex=A_{2}^{(3)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?A_{2}^{(3)}' title='A_{2}^{(3)}' /></a>. | 1994 | INFN-AE-94-10.pdf | P. Furlan, A.Ch. Ganchev, V.B. Petkova. | The BRST quantisation of the Drinfeld - Sokolov reduction applied to the case of <a href='https://www.codecogs.com/eqnedit.php?latex=A_{2}^{(1)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?A_{2}^{(1)}' title='A_{2}^{(1)}' /></a> is explored to construct in an unified and systematic way the general singular vectors in <i>W</i><sub>3</sub> and <a href='https://www.codecogs.com/eqnedit.php?latex=W_{3}^{(2)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?W_{3}^{(2)}' title='W_{3}^{(2)}' /></a> Verma modules. The construction relies on the use of proper quantum analogues of the classical DS gauge fixing transformations. Furthermore the stability groups <a href='https://www.codecogs.com/eqnedit.php?latex=\bar{W}^{(\eta&space;)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\bar{W}^{(\eta&space;)}' title='\bar{W}^{(\eta )}' /></a> of the highest weights of the <i>W</i> - Verma modules play an important role in the proof of the BRST equivalence of the Malikov-Feigin-Fuks singular vectors and the <i>W</i> algebra ones. The resulting singular vectors are essentially classified by the affine Weyl group <i>W</i> modulo <a href='https://www.codecogs.com/eqnedit.php?latex=\bar{W}^{(\eta&space;)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\bar{W}^{(\eta&space;)}' title='\bar{W}^{(\eta )}' /></a>. This is a detailed presentation of the results announced in a recent paper of the authors. |
| 5719 | 1994-03-09 | MISURA DELL'EFFICIENZA DI ESTRAZIONE DI UN FASCIO DI PROTONI DAL SPS PER MEZZO DI UN CRISTALLO INCURVATO. | 1994 | INFN-AE-94-9.pdf | G. Vuagnin. | Lo scopo dell'esperimento RD22/XLHB descritto in questa tesi e quello di fornire delle indicazioni sulla possibilità di realizzare un fascio estratto a partire dall'alone di un fascio circolante in un collisionatore per protoni, usando la tecnica innovativa dell'incanalamento di partieelle in un cristallo incurvato. La realizzazione di un fascio estratto e oggetto di una proposta per LHC, il 'Large Hadron Collider' [1] che verrà costruito nei laboratori CERN di Ginevra nel prossimo decennio. Essa è finalizzata alla costruzione di un esperimento a bersaglio fisso dedicato principalmente allo studio della fisica dei 'quark pesanti'. Questo esperimento, il cui acronimo è LHB (Large Hadron Beauty factory) [2], si pone come obiettivi principali una misura precisa delle asimmetrie che violano la simmetria CP in alcuni canali di decadimento del mesone B, la misura delle oscillazioni del mesone B, lo studio dei decadimenti rari del mesone B, la spettroscopia degli adroni contenenti un 'quark' di tipo b, e misura delle loro vite medie. La misura dell'efficienza di estrazione di protoni di 120 GeV/c dal Super Proto Sinerotrone (SPS) del CERN, che viene descritta in questa tesi, ha lo scopo di studiare in dettaglio l'interazione tra cristallo e fascio circolante, per acquisire le conoscenze necessarie a progettare il sistema di estrazione ad LHC dove i fasci circolanti avranno un'energia di 7 TeV. I miei principali contributi all'esperimento sono stati lo studio e la messa a punto di alcuni rivelatori del fascio estratto e l'analisi dei dati raccolti con particolare attenzione alla stima delle efficienze di rivelazione. Attenzione è stata anche dedicata alla raccolta e alla sintesi di informazioni che, data la novità dell'argomento, non hanno ancora ricevuto una trattazione sistematica. Il primo capitolo di questa tesi viene dedicato ad una trattazione teorica dell'incanalamento di particelle cariche positivamente nelle struttura periodica di un cristallo. Quando una particella carica penetra in un cristallo, quasi parallelamente alla giacitura di una famiglia di piani del reticolo cristallino, essa è sottoposta al campo generato dalla carica degli atomi del reticolo che la forzano a compiere delle oscillazioni rimanendo all'interno dei 'canali' compresi tra coppie di piani adiacenti. Quando ciò accade, il moto guidato della particella nel reticolo viene chiamato 'incanalato planarmente': se il cristallo è curvato elasticamente la traiettoria della particella al suo interno potrà seguirne la curvatura e quindi uscirne deflessa dalla sua direzione originaria, sotto condizioni (angolo critico di incidenza, raggio critico di curvatura) ed in percentuali che vengono discusse dettagliatamente. Nel secondo capitolo viene trattato il moto di un protone in un acceleratore di particelle. In particolare vengono ricavate le equazioni del moto trasverso che un protone, guidato dai campi magnetici ma non più accelerato, compie attorno all'orbita ideale; viene introdotta la funzione di betatrone con la quale è possibile descrivere il complicato moto oscillatorio delle particelle circolanti nell'anello. Viene inoltre definita l'emittanza, che permette di descrivere la larghezza e la divergenza del fascio. Queste nozioni consentono di descrivere i metodi con i quali è possibile ottenere artificialmente un aumento dell'emittanza in un unico fascio circolante al SPS, e simulare l'alone che in LHC sarà generato dalle interazioni tra i due fasci circolanti in senso opposto. Queste due introduzioni teoriche sono necessarie per lo studio dell'interazione tra cristallo e fascio circolante. La comprensione globale del fenomeno è cruciale per la progettazione del sistema di estrazione dell'alone di uno dei due fasci circolanti ad LHC: si vuole indagare infatti la possibilità di produrre un fascio estratto non solo di intensità adeguata, ma anche tale da non compromettere il normale funzionamento dell'acceleratore di particelle. Nel terzo capitolo viene descritto l'apparato realizzato per la misura dell'efficienza di estrazione. Vengono evidenziate le caratteristiche del sistema deflettore che è costituito essenzialmente dal cristallo curvato, ma che necessita di ulteriori strumenti: un sistema laser per l'allineamento tra il cristallo e il fascio, un goniometro per lo studio dell'estrazione in funzione dell'angolo di incidenza e dei collimatori per intervenire sul fascio riducendone l'intensità o definendone la larghezza. Vengono quindi descritte le caratteristiche dei rivelatori del fascio estratto e del sistema di acquisizione dei loro dati. Inoltre sono spiegate le modalità con cui si imprime al fascio un'eccitazione trasversa che ne aumenta la larghezza e porta le particelle a intercettare il cristallo. Il capitolo successivo tratta il metodo e la realizzazione della misura dell'efficienza di estrazione che è stimata per mezzo del rapporto tra il numero di particelle efficacemente incanalate dal cristallo e il numero di quelle che lo hanno colpito. Il numero di particelle deflesse è stimato dai conteggi ottenuti sui contatori del fascio estratto; è quindi importante conoscere le efficienze di rivelazione dei vari rivelatori. Ampio spazio e dedicato alla trattazione della loro stima. I risultati ottenuti dimostrano per la prima volta la possibilità di estrarre un fascio per mezzo di un cristallo incurvato con efficienze dell'ordine del 10%. Le prospettive aperte da questi risultati vengono brevemente discusse. Il quinto capitolo infine è dedicato alla descrizione della realizzazione nei laboratori INFN di Trieste, di un odoscopio a fibre scintillanti letto da un fotomoltiplicatore a catodo segmentato. Questo rivelatore è stato realizzato in vista di un suo utilizzo nell'ambito degli studi sull'estrazione del fascio. Viene riportato lo studio di alcune delle sue caratteristiche quali l'efficienza di rivelazione e la risoluzione spaziale, eseguite su un fascio di particelle ad alta energia al CERN. I risultati sono soddisfacenti. Essi possono essere interpretati con un semplice modello che descrive la raccolta e la conversione dei fotoni prodotti nelle fibre scintillanti. Un programma di simulazione è stato scritto e quindi messo a punto utilizzando i dati sperimentali. |
| 284 | 1994-03-02 | N = 2 Super– W(2)3 Algebra | 1994 | LNF-94-014(P).pdf | S. Krivonos, A. Sorin | We construct an N=2 superextension of Polyakov-Bershadsky W^(2)_3 algebra with an arbitrary central charge in the framework of Polyakov 'soldering' procedure. It contains as non-interesting subalgebras N=2 superconformal algebra and W^(2)_3 and can be regarded as a nonlinear closure of these two. Besides the current generating these subalgebras, it involves two pairs of fermionic currents with spins 1 and 2. A Hybrid fields-currents realization of this N=2 super-W^(2)_3 is presented. |
| 4002 | 1994-03-01 | A Remote Controlled Polarizer for Silicon Detectors | 1994 | INFN-TC_94-3.pdf | S. Altieri, O. Barnaba, P. Bruschi, F. Fossati, A. Lanza and T. Pinelli | |
| 283 | 1994-02-25 | Nonlinear Realizations of the WS23 Algebra | 1994 | LNF-94-013(P).pdf | S. Bellucci, V. Gribanov, S. Krivonos, A. Pashnev | In this letter we consider the nonlinear realizations of the classical Polyakov's algebra W^(2)_3. The coset space method and the covariant reduction procedure allow us to deduce the Boussinesq equation with intercharged space and evolution coordinates. By adding one more space coordinate and introducing two copies of the W^(2)_3 algebra, the same method yields the sl(3,R) Toda lattice equations. |
| 282 | 1994-02-24 | A Dose Comparison Between Gas Bremsstrahlung and Single Beam–Beam Bremsstrahlung at High Luminosity e+ e– Storage Rings | 1994 | LNF-94-012(P).pdf | D. Babusci, M. Pelliccioni | It is well known that the gas bremsstrahlung produced by the electron and positron beams circulating in a storage ring is one of the main photon radiation source for this kind of machines. However, at high luminosity e+e- storage rings, another considerable photon source should be taken into account: the so called radiative Bhabha scattering or single beam-beam bremsstrahlung. According to the luminosity, to the residual gas pressure and to the length of the straight sections where e+e- beams are made to collide, the latter process can become as important as gas bremsstrahlung. The dose-rates due to the radiative Bhabha scattering have been evaluated in the case of the Main Rings of the DAPHNE Project, the e+e- PHI-factory presenctly under construction at the Frascati National Laboratories (Italy). A comparison is made with the espected dose-rates due to gas bremsstrahlung. |
| 4001 | 1994-02-18 | Distribution Via the Internet DNS of RFC 1327 Mapping Rules and the INFNet Distributed Gateway System | 1994 | INFN-TC_94-2.pdf | P. Bonetti, C. Allocchio, A. Ghiselli | |
| 3968 | 1994-02-18 | Detection of Small Size Showers by Means of an RPC's Carpet | 1994 | INFN-AE_94-7.pdf | D. Campana, B. D'Ettorre Piazzoli, G. Di Sciascio | |
| 3969 | 1994-02-18 | MonteCarlo Simulation of Photon–Induced Air Showers | 1994 | INFN-AE_94-8.pdf | B. D'Ettorre Piazzoli, G. Di Sciascio | |
| 280 | 1994-02-17 | Selected Topics on Precision Electroweak Tests from ALEPH | 1994 | LNF-94-010(P).pdf | M. Pepe Altarelli | Some precision electroweak measurements from ALEPH are reviewed where a significant progress can still be realized. In particular improved measurements of the Z hadronic peak cross-section are obtained by exploiting the better accuracy of the second generation luminosity calorimeters. A new powerful method of analysis of the b\\overline(b) forward-backward asymmetry which relies on the so-called jet-charge technique is also presented. |
| 281 | 1994-02-17 | Chemical-Shift Low-Energy Photoelectron Diffraction: A Determination of the InP(110) Clean Surface Structural Relaxation | 1994 | LNF-94-011.pdf | S. Gota, R. Gunnella, Zi - Yu Wu, G. Jézéquel, C. R. Natoli, D. Sébilleau, E. L. Bullock, F. Proix, C. Guillot, A. Quémerais | We establish chemical-shift low-energy photoelectron diffraction as a novel and powerful method for the determination of clean surface structures. Combined with a new theoretical approach based on full multiple scattering theory with complex potential, the method is applied to the case of the InP(110) clean surface relaxation. The extreme sensitivity of this technique to structural parameters allows us to measure with good accuracy both the first layer and the second layer relaxation angle (respectively 23 celsius and -5 celsius). |
| 3967 | 1994-02-14 | Regge Calculus and Ashtekar Variables | 1994 | INFN-AE_94-6.pdf | G. Immirzi | |
| 3966 | 1994-01-31 | Tests of a Large Scale Production of Double Side Sensors for the L3 Silicon Microvertex Detector | 1994 | INFN-AE_94-5.pdf | M. Caria, E. Fiandrini, R. Massetti | |
| 4000 | 1994-01-28 | Cable Tester | 1994 | INFN-TC_94-1.pdf | G. Pitacco | |
| 277 | 1994-01-20 | Calcolo dei Fili Sottili Supertesi per Rivelatori di Traccia | 1994 | LNF-94-007(NT).pdf | B. Dulach | Si descrive un approccio al calcolo dei fili supertesi, utilizzati nei rivelatori di traccia a grande campata, sollecitati sia meccanicamente sia termicamente. Sono riportati risultati di prove sperimentali, effettuate su alcuni fili, allo scopo di verificare la validita' delle formule impiegate. |
| 278 | 1994-01-20 | On the Conversion Coefficients from Fluence to Ambient dose Equivalent | 1994 | LNF-94-008(P).pdf | A. Ferrari, M. Pelliccioni | The conversion coefficients from photon fluence (or other physical quantities) to ambient dose equivalent recommended by ICRU in the report 47 are overestimated in the energy range 4-10 MeV, since delivered from calculations carried out with the ICRU sphere in air. Such a procedure is clearly contraddictory with the definition of the ambient dose equivalent given by ICRU itself. In this paper, the values of the convention coefficients consistently evaluated by Monte Carlo calculations using the FLUKA code, are presented. The resulting ambient dose equivalent is shown not to be conservative with respect to the effective dose equivalent when the photon energy exceeds about 3 MeV. |
| 279 | 1994-01-20 | The Schwinger model on the lattice in the Microcanonical Femionic Average Approach | 1994 | LNF-94-009(P).pdf | V. Azcoiti, V. Laliena, G. Di Carlo, A. Galante, A. F. Grillo | The Microcanonical Fermionic Average method has been used so far in the context of lattice models with phase trantitions at finite coupling. To test its applicability to Asymptotically Free theories, we have implemented it in QED_2, i.e. the Schwinger Model. We exploit the possibility, intrinsic to this method, of studing the whole \\beta,m plane at negligible computer cost, to follow constant physics trajectories and measure the m \\rightarrow 0 limit of the chiral condensate. We recover the continuum result within 3 decimal places. |
| 3992 | 1994-01-20 | More About Tunneling Times, The Dwell Time, and the 'Hartman Effect' | 1994 | INFN-FM_94-1.pdf | V.S. Olkhovsky, E. Recami, A.K. Zaichenko | |
| 3994 | 1994-01-20 | The Tolman 'Antitelephone' Paradox: Its Solution by Tachyon Mechanics | 1994 | INFN-FM_94-2.pdf | E. Recami | |
| 3964 | 1994-01-20 | Micro–Universes and 'Strong Black–Holes': A purely Geometric Approach to Elementary Particle | 1994 | INFN-AE_94-3.pdf | E. Recami, F. Raciti, W.A.Rodrigues Jr., V.T. Zanchin | |
| 276 | 1994-01-18 | High Power ms Pulsed Electrolysis for Large Deuterium Loading on Pd Plates | 1994 | LNF-94-006(P).pdf | F. Celani , A. Spallone, P. Tripodi, A. Nuvoli, A. Petrocchi, D. Di Gioacchino, M. Boutet, P. Marini, V. Di Stefano | An high peak current (up to 100 A) and a very short pulse (1 ms) generator was used to perform electrolysis in D_20-LiOD solution using a Pd sheet as a cathode and a Pt net as an anode. This high power pulse (up to 50 KW) can be rated up to 20 KHz. Very high D/Pd values (up to about 1:1) has been reached with any cold-worked Pd sheets used. A very hard sheet (about 300 Hv) has generated an excess heat of the order of 15% for a long time (some weeks). Some considerations about the metallurgy of electrodes are performed and an effort is made to correlate the excess heat with metallurgical parameters, over-voltage and surface resistance. |
| 275 | 1994-01-17 | Dose Equivalents for Monoenergetic Electrons Incident on the ICRU Sphere | 1994 | LNF-94-005(P).pdf | A. Ferrari, M. Pelliccioni | Dose equivalents per unit of fluence at 0,07 mm, 10 mm and maximum dose equivalent per unit fluence along the principal axis of the ICRU sphere have been calculated by the FLUKA Monte Carlo code for broad parallel beam of monoenergetic electrons incident normel to the surface. Calculations were performed for the kinetic energy ranging from 70 keV to 10 GeV. The results are compared with other published calculations, whenever available. In the energy range where dose equivalents are almost constant, suitable average values are suggested to be used for practical purposes. |
| 271 | 1994-01-12 | Photofissility of 232Th Measured with Tagged Photons from 250 to 1200 MeV | 1994 | LNF-94-001.pdf | N. Bianchi, A. Deppman, E. De Sanctis, A. Fantoni, P. Levi Sandri, V. Lucherini, V. Muccifora, E. Polli, A. R. Reolon, P. Rossi, A. S. Iljinov, M. V. Mebel, J. D. T. Arruda - Neto, M. Anghinolfi, P. Corvisiero, G. Gervino, L. Mazzaschi, V. Mokeev, G. Ricco, M. Ripani, M. Sanzone, M. Taiuti, A. Zucchiatti, R. Bergère, P. Carlos, P. Garganne, A. Leprêtre | The photofission cross section o f232Th was measured in the energy range 250-1200 MeV using a monochromatic tagged photon beam and a parallel-plate avalanche detector. The 232Th nuclear photofissility was obtained by measuring simultaneously and in the same energy range the photofission cross section of 238U and assuming a photofissility equal to one for 238U. It was found that, contrary to the case for heavier actinides, the 232Th photofissility value does not saturate up to 1200 MeV. Rather, it lies between 0,6 and 0,8, and shows a weak energy dependence: it increases by about 15% over an interval of 1 GeV. A comparison of these experimental findings with the predictions of an intranuclear-cascade Monte Carlo calculation is given. |
| 272 | 1994-01-12 | Microcanonical Fermionic Average Method for Monte Carlo Simulations of Lattice Gauge Theories with Dynamical Fermions | 1994 | LNF-94-002.pdf | V. Azcoiti, V. Laliena, X. Q. Luo, C. E. Piedrafita, G. Di Carlo, A. Galante, A. F. Grillo, L. A. Fernandez, A. Vladikas | We present a comprehensive exposition of a method for performing numerical simulations of lattice gauge theories with dinamical fermions. Its main aspects have been presented elsewhere. This work is a systematic study of the feasibility of the method, which amounts to separating the evaluation of the fermionic determinant from the generation of gauge configurations through a microcanonical process. The main advantage consists in the fact that the parts of the simulation which are most computer intensive must not be repeated when varying the parameters of the theory. Moreover, we achieve good control over critical slowing down, since the configurations over which the determinant is measured are always very well decorrelated; in addition, the actual implementation of the method allows us to perform simulations at exactly zero fermion mass. We relate the numerical feasibility of this approach to an expansion in the number of flavors; the criteria for its convergence are analyzed both theoretically and in connection with physical problems. On more speculative grounds, we argue that the origin of the applicability of the method stems from the nonlocality of the theoryunder consideration. PACS number(s): 11.15.Ha, 02.70.Lq, 12.20.Ds |
| 273 | 1994-01-12 | Single Top Production at LEP II | 1994 | LNF-94-003.pdf | O. Panella, G. Pancheri, Y. N. Srivastava | We study the production of a single top quark through the processes e+\\gamma\\rightarrow \\nut\\overline(b), e+e- \\rightarrowW*\\gamma* \\rightarrow t\\overline(b) + e\\nu, and e+e- \\rightarrow W*W \\rightarrow t\\overline(b) + e\\nu within the minimal Standard Model. Numerical estimates of the signal cross-sections at LEP II energies are compared with pare production below threshold, e+e- \\rightarrowt\\overline(t)* \\rightarrow tW*\\overline(b) \\rightarrow t\\overline(b) + e\\nu. We show that if mtop> \\sqrt(s/2), the WW* and W*\\gamma* channels are dominant, but these processes give an interesting event rate only if the expected luminosity could be ameniorated relative to present estimates. |
| 274 | 1994-01-12 | Results of the Evaluation of the HP9000/742rt and the HP-RT Operating System | 1994 | LNF-94-004(NT).pdf | M. Carboni, H. Beker | Modern data acquisition (DAQ) systems are based on a network of computers running specialized software to support and control all the aspects of the DAQ stages. In this framework we have evaluated a solution proposed by Hewlett-Packard based around the HP9000/742rt processor operating in the VME enviroment. Hewlett-Packard has friendly provided us a complete system formed by a Host System and a Target System. In the present note we report on the results of tests related to the hardware configuration and to the Operating System; these results are of interest for the KLOE experiment in view of a possible usage of real time VME systems in the DAQ structure. We plan to perform similar tests on other VME based real time Systems (e.g. Motorola, CES, DEC Alpha in VME, etc.). |
| 3962 | 1994-01-07 | New Parton Structure Functions and Minijets in the Two-Component Dual Parton Model | 1994 | INFN-AE_94-1.pdf | F.W. Bopp, R. Tertermann, J. Randft | |
| 3963 | 1994-01-07 | Electron Structure, Zitterbewegung and a New Non–Linear Dirac–Like Equation | 1994 | INFN-AE_94-2.pdf | M. Pavsic, E. Recami, W.A. Rodrigues | |
| 428 | 1993-12-23 | Lectured on Advanced Physics: A Primer on General Relativity | 1993 | LNF-93-078(IR).pdf | E. Coccia, L. Fraioli, G. Mazzitelli | |
| 5718 | 1993-12-21 | A SIMULATION STUDY OF THE BEHAVIOUR OF FINE MESH PHOTOMULTIPLIERS IN MAGNETIC FIELD. | 1993 | INFN-AE-93-27.pdf | G. Barbiellini, A. Martinis, F. Scuri. | Results of a Monte Carlo simulation study on fine-mesh photomultipliers (PM) behaviour in magnetic field (B) are reported. This work is accomplished in order to understand the details of the electron cascade between the dynodes: transit time and transit time spread are investigated as well as gain, with respect of several relative orientations of the field and the PM axis for two values of the B-field intensity, 0.14 and 0.28 T, at which some experimental results are also available. Some characteristic of the energy spectrum of the secondary electron emission (SEE) is also taken into account in this work. The aim is to better understand which technical constructive parameters are more sensitive to the optimization of the PM performance in presence of high B-fields (e.g. as required for the KLOE experiment). The simulation results are compared with those experimentally obtained with the Hamamatsu R2490-05 fine mesh tubes. |
| 3940 | 1993-12-21 | Optimization of FEL Parameters for the MUH Experiment (Spectroscopy of Muonic Hydrogen) | 1993 | INFN-BE_93-7.pdf | E. Milotti | |
| 427 | 1993-12-16 | Low – Energy Photon–Photon Collisions to Two-Loop order | 1993 | LNF-93-077(P).pdf | S. Bellucci, J. Gasser, M. E. Sainio, | We evaluate the amplitude for \\gamma\\gamma\\rightarrow\\pi^0\\pi^0 to two loops in chiral perturbation theory. The three new counterterms which enter at this order in the low-energy expansion are estimated with resonance saturation. We find that the cross-section agrees rather well with the available data and with dispersion theoretic calculations even substantially above threshold. Numerical results for the Compton cross section and for the neutral pion polarizabilities are also given to two-loop accuracy. |
| 424 | 1993-12-07 | A Modular Design for Glass Spark Counters | 1993 | LNF-93-074(P).pdf | G. Bencivenni, G. Felici, E. Iacuessa, M. D'Incecco, C. Gustavino | In this paper a fully redesigned Glass Spark Counter is described. The detector exhibits noiseless operation and a time resolution less than 1 ns. The performance makes this detector a good candidate for large area cosmic ray experiments. The simple assembling procedure allows large sensitive area at low cost. |
| 425 | 1993-12-07 | A Broadband Waveguide to Coaxial Transition for High Order Mode Damping in Particle Accelerator RF Cavities | 1993 | LNF-93-075(P).pdf | R. Boni , F. Caspers, A. Gallo, G. Gemme, R. Parodi | A novel Broadband Waveguide to Coaxial Transition for High Order Mode Damping in Particle Accelerator RF Cavities (BTHD) has been studied and developed in the framework of the Frascati \\Phi-Factory project DAPHNE. The cavity high order modes (HOM) are the primary source of coupled-bunch instabilities in multibunch storage rings. The energy delivered by the particle beam to the cavity HOMs and coupled out with waveguides is converted by BTHD into the TEM coaxial mode and dissipated by a 50\\Omega load connected via a ceramic feedthrough. This article deals with the design and the low power tests performed on a BTHD prototype and the considerations for a real application to an accelerator. |
| 426 | 1993-12-07 | Hadrons at DAFNE | 1993 | LNF-93-076(P).pdf | G. Pancheri | The Frascati \\phi-factory and its two planned detectors are introduced. Physics items of interest in hadron physics like chiral perturbation theory tests, vector meson dominance, two photon physics, radiative \\phi decays and the nature of scalar particles are discussed. |
| 3932 | 1993-12-01 | Monte Carlo Simulations in High Energy Cosmic Ray Physics Presented at the IV Intern. Conf. on Calorimetry in High Physics, La Bidola (Isola d'Elba), Italy, September 20–25, 1993 | 1993 | INFN-AE_93-26.pdf | G. Battistoni | |
| 3939 | 1993-12-01 | Using a Penning Trap to Weigh an Antiproton | 1993 | INFN-BE_93-6.pdf | V.Lagomarsino, V. Lia, G. Manuzio, G. Testera | |
| 423 | 1993-11-27 | Nilpotent Commuting Fields, Asymptotically Free f4 Theory and Selfavoiding Random Walks | 1993 | LNF-93-073(P).pdf | F. Palumbo | Bilinear composities of anticommuting constituents are even elements of a Grassmann algebra, which are nilpotent commuting variables (NCV). We define an integral on these variables and strart investigating the properties of nilpotent commuting scalar fields. |
| 422 | 1993-11-23 | Gas Bremsstrahlung: A Comparison of Measurements and Simulations | 1993 | LNF-93-072(P).pdf | A. Esposito, A. Ferrari, L. Liberatori, M. Pelliccioni | The absolute bremsstrahlung intensity generated by the interaction of the electron beam of the Adone storage ring of LNF has been measured as a function of angle and distance from the emitting straight section. Absorbed doses have been measured at variuos distances from the straight section by means of thermoluminescent dosimeters for a 1.5 GeV electron beam. The experiment has been simulated using the most recent version of the FLUKA code which includes a very accurate treatment of bremstrahlung. In spite of the considerable uncertainties on the experimental value of the pressure, it has been found that the computed results are in satisfactory agreement with the results of the measurements. The experiment provided also evidence for the angular distribution of the bremstrahlung intensity at energies in excess of 1 GeV. |
| 3931 | 1993-11-19 | Non Linear Clustering in the Cold+Hot Dark Matter Model | 1993 | INFN-AE_93-25.pdf | S.A. Bonometto, S. Borgani, S. Ghigna; A. Klypin, J.R. Primack | |
| 421 | 1993-11-17 | Nilpotent Commuting Scalar Fields and Random Walk | 1993 | LNF-93-071(IR).pdf | F. Palumbo | We show that the correlation functions of a free nilpotent commuting scalar field are equal to the correlation functions of a random walk where paths with odd number of crossings give a negative contribution. It follows that in a number of dimensions where the self-avoidind random walk is a free theory in the continuum limit, the nilpotent commuting scalar behaves as an ordinary scalar. We show how a nilpotent commuting scalar can be to an abelian gauge field. |
| 3930 | 1993-11-12 | Minijets in the Two–Component Dual Parton Model in Hadronic and Heavy Ion Collisions | 1993 | INFN-AE_93-24.pdf | F.W. Bopp, R. Engel, I. Kawrakow, D. Pertermann, J. Ranft | |
| 3944 | 1993-11-12 | More About Tunneling Times, The Dwell Time, and the 'Hartman Effect' | 1993 | INFN-FM_93-4.pdf | V.S. Olkhovsky, E. Recami, A.K. Zaichenko | |
| 5717 | 1993-11-09 | MONTE CARLO STUDY OF A POSITRON EMISSION TOMOGRAPH BASED ON MULTISTRIP MULTILAYER Si DETECTORS. | 1993 | INFN-AE-93-20.pdf | G. Barbiellini, M. Boezio, A. Rindi, C. Rizzo. | We have simulated a Positron Emission Tomograph based on the use of multistrip multilayer Silicon detectors with a depleted Uranium 40 μm thick converters. The imaging capabilities of the tomograph have been studied with a fully 3-D Monte Carlo simulation based on the GEANT code. By using a simple 3-D back projection algorithm a spatial resolution of about 2 mm (Full Width Half Maximum) has been obtained with a <sup>18</sup>F point source. |
| 3929 | 1993-11-08 | DELPHI Results on the Study of High Energy Photons in e+e- Æ ff events | 1993 | INFN-AE_93-23.pdf | A. De Min | |
| 3961 | 1993-11-04 | RSHUT v.2.0 — Installation and User Guide | 1993 | INFN-TC_93-17.pdf | C. Strizzolo | |
| 3928 | 1993-11-04 | Correlation Between Future and Past Photon Events | 1993 | INFN-AE_93-22.pdf | A. Widom, Y.N. Srivastava, E. Sassaroli | |
| 3927 | 1993-11-03 | Test Beam Results from the Prototype L3 Silicon Microvertex Detector | 1993 | INFN-AE_93-21.pdf | R. Battiston et al. | |
| 419 | 1993-10-28 | Observability Limits for Toponium at Hadron Colliders | 1993 | LNF-93-069(P).pdf | N. Fabiano, A. Grau, G. Pancheri | We discuss existency conditions for toponium bound states and estimate the wave function at the origin, comparing different models for the static interquark potential. We evaluate the production cross-section for singlet state with J^PC = 0-+, and compare the signal with the expected QCD background at SSC energies. We find that the present lower limits on the top mass almost exclude the possibility of this bound states and their detectability. |
| 420 | 1993-10-28 | Ultrathin Film Characterization by Standing Wave Photoemission Measurements | 1993 | LNF-93-070.pdf | E. Burattini, G. Cappuccio, S. Simeoni, I. Yu Kharitonov, M. V. Kovalchuk, N. N. Novikova, A. N. Sosphenov, S. I. Zheludeva | |
| 3938 | 1993-10-26 | Radiative Transitions in Muonic Hydrogen (Revised) | 1993 | INFN-BE_93-5.pdf | E. Milotti | |
| 5716 | 1993-10-25 | QUANTUM DEFORMED CANONICAL TRANSFORMATIONS, W<sub>∞</sub>-ALGEBRAS AND UNITARY TRANSFORMATIONS. | 1993 | INFN-AE-93-19.pdf | E. Gozzi, M. Reuter. | We investigate the algebraic properties of the quantum counterpart of the classical canonical transformations using the symbol-calculus approach to quantum mechanics. In this framework we construct a set of pseudo-differential operators which act on the symbols of operators, i.e., on functions defined over phase-space. They act as operatorial left- and right multiplication and form a <a href='https://www.codecogs.com/eqnedit.php?latex=W_{\infty&space;}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?W_{\infty&space;}' title='W_{\infty }' /></a> x <a href='https://www.codecogs.com/eqnedit.php?latex=W_{\infty&space;^{-}}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?W_{\infty&space;^{-}}' title='W_{\infty ^{-}}' /></a> algebra which contracts to its diagonal subalgebra in the classical limit. We also describe the Gel'fand-Naimark-Segal (GNS) construction in this language and show that the GNS representation-space (a doubled Hilbert space) is closely related to the algebra of functions over phase-space equipped with the star-product of the symbol-calculus. |
| 418 | 1993-10-20 | Enhancement of Critical Temperature up to 100K of YBCO Ozone Annealed Pellets by Deuterium Absorption | 1993 | LNF-93-068(P).pdf | F. Celani, M. Boutet, D. Di Gioacchino, A. Spallone, P. Tripodi, S. Pace, M. Polichetti | In this paper we report preliminary results about transition temperatures of YBa_2Cu_3O_7 pellets loaded with high pressure deuterium gas. After the gas loading non-superconducting phases were not detected by X-ray diffraction. The complex magnetic AC susceptibility has been measured as a function of the temperature. One D-YBCO pellet exhibited a magnetic critical temperature (T_c) as high as 100K and the absence of a significant weakening of the superconducting grain coupling. Another sample, with T_c of 95.8K in free air, showed a T_c onset as high as 102K under 35bar of deuterium gas pressure. |
| 417 | 1993-10-15 | Analysis of Methods for Controlling Multibunch Instabilities in DAFNE | 1993 | LNF-93-067(P).pdf | S. Bartalucci, M. Bassetti, R. Boni, S. De Santis, A. Drago, A. Gallo, A. Ghigo, M. Migliorati, L. Palumbo, R. Parodi, M. Serio, B. Spataro, G. Vignola, M. Zobov | The e+e- DAPHNE collider is designed to reach a luminosity of the order of 10^32-10^33[sec^-1 cm^-2] at 510 MeV, by storing high current. Such a current, of the order of few amperes for beam, can in principle be achieved by filling many RF buckets in the machine. One of the main problems arising in the beam dynamics concerns the Multibunch Instabilities caused by the strong coupling between the beam and the parasitic HOM resonances of the RF cavity. Due to the high current, the instability is very fast, so that it is impossible to stabilize the beam with a feedback system alone. An effort has to made to reduce the shunt impedance of the cavity HOMs, so that a feedback system can be effective. This task is accomplished by properly designing the RF cavity and by coupling off the HOMs through loops or waveguides in order to extract energy from the resonant fields, thus reducing at the same time the quality factor Q and the shunt impedance R. The residual excitation of beam oscillations is damped by means of a bunch-by-bunch digital feedback system. |
| 414 | 1993-10-11 | Fine Structure of the P States in Quarkonium and the Spin–Dependent Potential | 1993 | LNF-93-064(P).pdf | J. Lee-Franzini, Paula J. Franzini | The CUSB-II detector at CESR has yielded precision measurements of branching ratios for electric dipole transitions in the \\Upsilon system, and of the masses and the fine structure splittings of the Xb(2P) states. Comparison of htese measurements with those from the charmonium system indicate that problems exist with the present descriptions of the spin-dependent potential, and that more precision measurements are sorely needed. |
| 415 | 1993-10-11 | Hadronic Width of the cb States | 1993 | LNF-93-065(P).pdf | J. Lee-Franzini, Paula J. Franzini | The CUSB-II Collaboration has inferred the hadronic widths of the Xb(2P_J) states from the measured branching fractions and the potential model rates of their E1 decays. These widths agree qualitatively with perturbative QCD calculations. The disagreement in absolute values of the widths between the experimental and QCD predictions confirm the same situation as in the charmonium system, which means more precision measurements are sorely needed. |
| 416 | 1993-10-11 | On the Forward Angle Dispersion Sum Rules for the Pion Polarizabilities | 1993 | LNF-93-066.pdf | D. Babusci, S. Bellucci, G. Giordano, G. Matone | |
| 413 | 1993-10-08 | f4 Theory with Even Elements of a Grassmann Algebra | 1993 | LNF-93-063(P).pdf | F. Palumbo | Bilinear composites of anticommuting constituents are even elements of a Grassmann algebra, which are nilpotent commuting variables (NCV). We study a \\phi^4 theory where the Fourier components of the \\phi-field are NCV and suggest that it is asymptotically free. |
| 5715 | 1993-10-08 | COUNTING PERIODIC TRAJECTORIES VIA TOPOLOGICAL CLASSICAL MECHANICS. | 1993 | INFN-AE-93-18.pdf | E. Gozzi. | We prove that the number of periodic trajectories of arbitrary period T on the flow tangent to periodic trajectories in phase space of the same period T, is equal to the Euler number of the underlying phase-space. This results holds for systems with compact phase-space and isolated periodic orbits. |
| 3923 | 1993-09-29 | DELPHI Results on the Hadronic Decays of the t Lepton | 1993 | INFN-AE_93-17.pdf | W. Bonivento | |
| 410 | 1993-09-28 | MACTRA: an Interface Between a Macintosh II and a Transputer Link | 1993 | LNF-93-060(IR).pdf | L. Trasatti, M. Coli, A. Sapienza | MACTRA is a NuBus board that allows to interface a Macintosh with a Transputer system through a standard transputer link. The board has been designed to transfer graphic data at a high rate to the Macintosh. A transfer speed of 600 kBytes/s has been achieved from the link to the Mac. No effort has been done to optimize the speed in the opposite direction, because the system has been designed to perform as a graphical output device. |
| 411 | 1993-09-28 | La Dosimetria Biologica delle Radiazioni Ionizzanti: Aggiornamenti e Fattibilità | 1993 | LNF-93-061.pdf | C. Catena, E. Righi | |
| 412 | 1993-09-28 | La Dosimetria Citogenetica: Curve Dose-Effetto e Confronto Metodologico | 1993 | LNF-93-062.pdf | C. Catena, D. Conti, A. Del Nero, E. Righi | |
| 409 | 1993-09-27 | Ultracryogenic Gravitational Wave Experiments | 1993 | LNF-93-059(P).pdf | E. Coccia | Direct detection of gravitational waves, for physical or astrophysical study, is one of the great challenges of contemporary experimental physics. The problem is the extremely small size of the effect one wishes to measure. The advantages emerging from cooling a resonant antenna to very low temperatures are discussed in the first part of the lecture, together with the main requirements and features of cryogenic systems for gravitational wave experiments, In the second part we report on the ultralow temperature detector NAUTILUS. The goal of this new generation antenna is to detect bursts of gravitational radiation from sources located at distances up to the Virgo Cluster of galaxies. NAUTILUS is installed in the Frascati INFN Laboratories and should start operating at the end of 1993. |
| 408 | 1993-09-22 | Four-Quark Mesons in pp Annihilation. | 1993 | LNF-93-058(IR).pdf | P. Volkovitsky | We discuss here a possible four-quark meson spectrum in the region of meson masses 1.2 - 1.8 GeV and a mechanism of these states production in \\overline{p}p annihilation. In correspondence with our previous paper we consider f_2/AX resonance, recently seen in \\overline{p}p annihilation by several groups, as a four quark state. We show that experimental data in the frame of a simple model for four-quark meson production support the assumption that f_2/AX is the four-quark system of two scalar-isoscalar diquarks in D-wave. Using this explanation of f_2/AX we construct the spectrum of non-strange four-quark mesons with masses around 1.5 GeV and discuss the possible channels to detect exotic four-quark states in \\overline{p}p annihilation. |
| 407 | 1993-09-14 | Gauge Transformations and Boundary Conditions in Compact QED on the Lattice | 1993 | LNF-93-057(P).pdf | G. De Franceschi, F. Palumbo | We show that the hamiltonian formalism of compact QED on the lattice gauge transformations appear as representations of translations on a circle or on a line according to the boundary conditions on the wave functions. When gauge invariance is enforced, one gets at strong coupling a linear potential in the first case and a Coulombic potential in the second. |
| 3960 | 1993-09-13 | Magnetic Bottle Configuration to Coat 1.3 GHz Copper Cavities with a Nb Sputtered Film | 1993 | INFN-TC_93-16.pdf | M.Ferrario, S.Kulinski, M.Minestrini, S.Tazzari | |
| 405 | 1993-09-10 | MASS-Wizar | 1993 | LNF-93-055(R).pdf | Mass - Wizar Collaboration | We describe a silicon sampling shower detector conceived as a fine grain imaging device to carry out studies on the antimatter component in the cosmic radiation. This instrument, that will be flown during the 1993 balloon flight campaign, is formed by 5 xy sensitive layers (strip pitch 3.6mm) interleaved with 4 showering material planes (tungsten 1 radiation lenght) having low power consumption electronic readout. |
| 406 | 1993-09-10 | Gas Bremsstrahlung Evaluation for the DAFNE Project | 1993 | LNF-93-056(R).pdf | A. Ferrari, L. Liberatori, M. Pelliccioni, P. R. Sala | Bremsstrahlung produced in the storage rings of the DAPHNE Project by the interactions of electrons and positrons with the residual gas in vacuum chambers has been studied using the FLUKA code. Photon spectra and quantitative estimates of fluence rate and tissue absorbed dose rate are given. On the basis of the obtained results the precautions to take are discussed. |
| 404 | 1993-09-07 | E687 Results on Charm Baryon Decays | 1993 | LNF-93-054(P).pdf | A. Zallo | New results from the Fermilab photoproduction experiment E687 on charmed baryon decays are presented. The measurements of \\Lambda_c,\\Xi^+_c,\\Xi^0_c lifetimes and of the Cabibbo suppressed decay \\Lambda^+_c\\rightarrow pK-K+ are described. Preliminary results of charm baryon decays involving \\Sigma+- with \\Sigma+\\rightarrow p\\pi^0 or \\Sigma+-\\rightarrow n\\pi+- are also given. |
| 403 | 1993-09-06 | EURODAFNE – Collaboration Meeting (Frascati, 19–23 April, 1993) | 1993 | LNF-93-053(IR).pdf | A A. V V. | |
| 401 | 1993-08-30 | The Equivalence Principle, CP Violations and the Higgs Boson Mass | 1993 | LNF-93-051(P).pdf | S. Bellucci, V. Faraoni | We consider the violation of the equivalence principle induced by a massive gravivector, i.e. the partner of the graviton in N > 1 supergravity. The present limits on this violation allows us to obtain a lower bound on the v.e.v. of the scalar field that gives the gravivector its mass. We consider also the effective neutral kaon mass difference induced by the gravivector and compare the result with the experimental data on the CP violation parameter \\epsilon. |
| 402 | 1993-08-30 | New Results on Meson Spectroscopy from OBELIX | 1993 | LNF-93-052.pdf | A. Adamo..., C. Guaraldo..., A. Lanaro..., V. Lucherini..., F. Nichitiu et al. | |
| 3959 | 1993-08-30 | Synchrotron Radiation for Medical Physics A Comparison between Digital and Conventional Screen-Film Images | 1993 | INFN-TC_93-15.pdf | G. Barbiellini | |
| 3958 | 1993-08-24 | A Monte Carlo Code for Antineutrons | 1993 | INFN-TC_93-14.pdf | A. Bressan | |
| 392 | 1993-08-03 | Measurement of Transverse and Longitudinal Spectra | 1993 | LNF-93-042(P).pdf | M. Serio, M. Zobov | In this paper we discuss transverse and longitudinal spectra in circular accelerators and various measurement techniques. |
| 393 | 1993-08-03 | STATUS of THE COMMISSIONING of LISA FOR THE SURF FEL EXPERIMENT | 1993 | LNF-93-043.pdf | M. Castellano, M. Ferrario, M. Minestrini, P. Patteri, F. Tazzioli, N. Cavallo, F. Cevenini, F. Ciocci, G. Dattoli, A. Di Pace, G. P. Gallerano, L. Giannesi, A. Renieri, E. Sabia, A. Torre, L. Catani | |
| 394 | 1993-08-03 | Physical and Mineralogical Features of Polycrystalline Samples Obtained by Means of Conventional and Synchrotron XRD Techniques | 1993 | LNF-93-044.pdf | G. Berti, M. Bertoli, E. Burattini, G. Cappuccio, R. Menichini, S. Simeoni | |
| 395 | 1993-08-03 | MacDust - a Power Diffraction Package Developed for the “ADONE” High Resolution Diffraction Station | 1993 | LNF-93-045.pdf | E. Burattini, G. Cappuccio, P. Maistrelli, S. Simeoni | A High Resolution Powder Diffraction Station (PO.DI.STA.) was installed at the beginning of 1991 on the ADONE-Wiggler magnet beam line. The station and the first powder diffraction spectra, collected with synchrotron radiation, were presented at the EPDIC-1 Conference[1]. More details can also be found in [2]. For this station, a very sophisticated software package 'MacDUST' has been developed on an Apple Machintosh computer, using the Microsoft QuickBASIC compiler. It allows very easy and comfortable operations by means of a graphycal user interface environment, typical of the Macintosh system. The package consists of five major programs. The main program, MacDIFF, performs all the graphic operations on the experimental data, including zooming, overlapping, cursor scanning and editing of patterns, control of output operations to printers and HPGL plotters. It also includes several analysis routines for data smoothing, a first derivate peak search algorithm, two background subtraction routines and two profile fitting programs: one based on the simplex method and the other on the Marquardt modification of a least-square algorithm. MacPDF and MacRIC are both dedicated to phase identification. The first program is an archive manager for searching, displaying and printing phase records; MacRIC is a graphic aided search-match program based on the Hanawalt [5] algorithm. Mac3-DIM is a plot program, useful, e.g., for representing kinetics three dimensionally. MacRIET is a Macintosh version of the well known Rietveld [14,15] refinement program. This version, besides conventional structure rfinements, also allows to determination of micro structural parameters, i.e. micro strain and crystallite size [9]. The program can also be used to simulate a pattern, once the structure of the compound is known. Taking advantage of the very intuitive Macintosh graphic user interface, through dialog and alert boxes, the program allows straightforward introduction and modification of the structure parameters. |
| 396 | 1993-08-03 | Simulation of Particle Interactions in NaI | 1993 | LNF-93-046.pdf | V. Muccifora, M. Mirazita, L. Mazzaschi, N. Bianchi, M. Anghinolfi, P. Corvisiero, E. De Sanctis, A. Fantoni, G. Gervino, P. Levi Sandri, V. Mokeev, E. Polli, A.R. Reolon, G. Ricco, M. Ripani, P. Rossi, M. Sanzone, M. Taiuti, A. Zucchiatti | |
| 397 | 1993-08-03 | A Glass Spark Counter for High Rate Environments | 1993 | LNF-93-047.pdf | G. Bencivenni, M. Benfatto, G. Felici, C. Gustavino, B. Locardi | |
| 398 | 1993-08-03 | Lead/Scintillating Fiber Electromagnetic Calorimeters with 4.8% / žE[GeV] Energy Resolution in the 20-80 MeV Range | 1993 | LNF-93-048.pdf | D. Babusci, S. Bianco, R. Casaccia, L. Daniello, F. L. Fabbri, M. Giardoni, M. Lindozzi, L. Passamonti, V. Russo, S. Sarwar, L. Votano, A. Zallo, L. E. Casano, M. Capogni, A. D'angelo, D. Moricciani, F. Ghio, B. Girolami, D. Hertzog, S. Hughes, P. Reimer, R. Toyloe | |
| 399 | 1993-08-03 | Absolute Measurement of the Total Photoabsorption Cross Section for Carbon in the Nucleon Resonance Region | 1993 | LNF-93-049.pdf | N. Bianchi, V. Muccifora, A. Deppman, E. De Sanctis, A. Fantoni, P. Levi Sandri, V. Lucherini, M. Mirazita, E. Polli, A.R. Reolon, P. Rossi, M. Anghinolfi, P. Corvisiero, G. Gervino, L. Mazzaschi, V. Mokeev, G. Ricco, M. Ripani, M. Sanzone, M. Taiuti, A. Zucchiatti | |
| 400 | 1993-08-03 | Analyses of Sr/La X-Ray-Absrption-Near-Edge Structure in T-Phase La2-xSrxCuO4 Compound | 1993 | LNF-93-050.pdf | Z. Y. Wu, M. Benfatto, C. R. Natoli | |
| 3937 | 1993-08-02 | Temporal Description of Interference Phenomena in Light-Ion Collisions | 1993 | INFN-BE_93-4.pdf | S. Cherubini, V.S. Olkhovsky, A.K. Zaichenko | |
| 391 | 1993-07-29 | Toponium Bound States at LHC/SSC | 1993 | LNF-93-041(P).pdf | N. Fabiano, A. Grau, G. Pancheri | We discuss existency conditions for toponium bound states and evaluate the wave function at the origin, comparing different models for the static interquark potential. We evaluate the production cross-section for J^PC=0^+-,1^-- for the case of a static Coulomb Potential. For the pseudoscalar case, which at LHC and SSC would be produced with the highest cross-section, we compare the signal with the expected QCD background. We find that the present lower limits on the top mass almost exclude the possibility of these bound states and their detectability. |
| 390 | 1993-07-28 | The r0 Æ p+p- p+p- Decay in Effective Lagrangians Incorporating Vector-Mesons | 1993 | LNF-93-040(P).pdf | A. Bramon, A. Grau, G. Pancheri | The \\rho\\rightarrow\\pi+\\pi-\\pi+\\pi- branching ratio is predicted to be (0.5+-0.1) x 10^-4, (1.7+-0.2) x 10^-4 and (4.0+-0.5) x 10^-4 in the 'Hidden Symmetry' scheme, conventional Vector-Meson Dominance and the 'Massive Yang-Mills' approach, respectively. The corresponding experimental upper bound is 2 x 10^-4. |
| 389 | 1993-07-27 | DANTE: Control System for DAFNE Based on Personal Computers and High Level Tools | 1993 | LNF-93-039(P).pdf | G. Di Pirro, C. Milardi, A. Stecchi, L. Trasatti | The DANTE (DAPHNE New Tools Environment) control system has been fully designed and is now being integrated. Several innovative features have been inserted in the design: - the use of Macintosh Personal Computers throughout the whole system, including VME CPU's built on purpose using Apple CPU boards gives access to an enormous quantity of high level software, where new powerful tools become available day by day. LabVIEW by National Instruments has been chosen as development environment. - point to point high speed fiber optic links instead of a network for high bandwidth system update; - centralized architecture for simplicity and reliability; - centralized real time Database continuosly updated at runtime by the peripheral CPU's and polled by the consoles; - open architecture, with simple and efficient communications between internal processors and the rest of the world. Accelerator physics programs and applications can be written in any language and communicate with the LabVIEW environment through direct Process to Process communication. |
| 3943 | 1993-07-27 | Studies of the Mechanism of Dissipation at Radio Frequency in High Temperature Superconducting Materials | 1993 | INFN-FM_93-3.pdf | B. Zhang, P. Fabbricatore, G. Gemme, R. Musenich, R. Parodi | |
| 3936 | 1993-07-20 | The 3He + 6Li Collision at Einc=5 MeV | 1993 | INFN-BE_93-3.pdf | P. D'Agostino, G. Fazio, G. Giardina, R. Palamara, M. Sacchi | |
| 3957 | 1993-07-19 | Radionuclide Production by Protons, Deuterons and a-Particles in the Energy Range 6 - 70 MeV | 1993 | INFN-TC_93-13.pdf | S. Agosteo, M. Bonardi, A. Foglio Para, M. Lattuada, M. Silari | |
| 5714 | 1993-07-16 | PRODUCTION AND DECAY OF THE BEAUTY BARYON | 1993 | INFN-AE-93-15BIS.pdf | A. Fridman. | We estimate the beauty-baryon production in <i>pN</i> interactions at c.m. energies relevant to the LHC and SSC projects. The possibilities of searching for the CP violation effects in the beauty baryon are discussed. Measurements of special decay channels are suggested in order to estimate |<i>V<sub>ub</sib></i>/<i>V<sub>cb</sub></i>| with good precision. |
| 5713 | 1993-07-07 | A STUDY FOR A SATELLITE SYSTEM TO LOCATE GAMMA-RAY BURSTERS. | 1993 | INFN-AE-93-15.pdf | A. Colavita, F. Fratnik. | We present a study on the feasibility of using a system of small, light, long lived and simple satellites in order to locate gamma-ray bursters. Each small satellite possesses only electronics to discriminate gamma-rays out of the large background of cosmic rays and to time the arrival of the front of a gamma-ray burst. To locate the burster applying triangulation methods, we use the time of arrival of front of the gamma-ray burst and the position of the satellites at that very moment. We review an elementary version of the triangulation method to study the angular error in the determination of the burster position, since almost all non-pathological distances among satellites can determine the angular location of the source to better than one arc min. This precision allows us to find the visible counterpart of the burster, if it exists. These simple satellites can be made modular in order to customize their sizes or weights in order to use spare space available during major launches. |
| 3921 | 1993-07-07 | A Study for a Satellite System to Locate Gamma-Ray Bursters | 1993 | INFN-AE_93-15.pdf | A. Collavita, F. Fratnik | |
| 382 | 1993-07-05 | The Design of a Level 1 Tracking Trigger Processor for LHC | 1993 | LNF-93-032.pdf | M. Curatolo, B. Esposito, G. Franchi, A. Teodoli | |
| 383 | 1993-07-05 | Level 1 Tracking Trigger and Pattern Recognition at LHC with a Scintillating Fibre Hodoscope | 1993 | LNF-93-033.pdf | M. Curatolo, B. Esposito | |
| 384 | 1993-07-05 | The FENICE Detector at e+e- Collider ADONE | 1993 | LNF-93-034(P).pdf | A. Antonelli, R. Baldini, A. Balla, C. Becciani, M. Bertani, M. E. Biagini, C. Bini, V. Bidoli, R. Bressani, R. Calabrese, R. Cardarelli, R. Carlin, C. Casari, R. Chiaratti, L. Cugusi, P. Dalpiaz, S. De Simone, G. De Zorzi, A. Di Virgilio, A. Feliciello, M.L. Ferrer, P. Ferretti - Dalpiaz, P. Gauzzi, P. Gianotti, R. Giantin, S. Guiducci, F. Iazzi, E. Luppi, S. Marcello, A. Masoni, R. Messi, B. Minetti, M. Morandin, L. Paoluzi, E. Pasqualucci, G. Pauli, F. Petrucci, A. Pia, G. Pitacco, M. Posocco, M. A. Preger, G. Puddu, L. Santi, R. Santonico, P. Sartori, M. Savrie’, S. Serci, M. Spinetti, L. Tecchio, S. Tessaro, C. Voci | The FENICE detector, installed at the Frascati e+e- storage ring ADONE, for measuring the neutron e.m. form factors in the time-like region, is described. FENICE is a non magnetic detector and consists of a complex array of scintillators, limited streamer tubes and iron converters for detecting mainly the process e+e-\\rightarrow\\overline{n}n. Antineutrons are identified by the charged prongs produced in their annihilation and the antineutron velocity is measured by the revieved annihilation time respect to the beam crossing time. Neutrons are detected in plastic scintillator layers. To reduce the cosmic rays background a concrete shield, covered by an active veto system, is added. |
| 385 | 1993-07-05 | Radiative Bhabha Scattering at DAFNE | 1993 | LNF-93-035(P).pdf | M. Greco, G. Montagna, O. Nicrosini, F. Piccinini | The problem of computing radiative Bhabha scattering cross sections in realistic experimental setup at DAPHNE energies is considered. The matrix element for the reaction e+e-\\rightarrow e+e-\\gamma at very small electron scattering angles is computed exactly and compared with existing results. Finite mass corrections are explicity given for the very forward scattering region. A numerical study is presented for electron single tagging at very small angle, electron-positron double tagging both at small and large angles and electron-photon coincidence rates in the forward direction. |
| 386 | 1993-07-05 | New Look at the Critical Behaviour of Non Compact QED with Dynamical Fermions | 1993 | LNF-93-036.pdf | V. Azcoiti, G. Di Carlo, A. F. Grillo | |
| 387 | 1993-07-05 | The Most Powerful Scintillator Supernovae Detector: LVD | 1993 | LNF-93-037.pdf | G. Anzivino, S. Bianco, R. Casaccia, F.L. Fabbri, G. Landi, S. Sarwar, L. Votano, A. Zallo | |
| 388 | 1993-07-05 | First Observation of High-Energy Cosmic-Ray Events Obtained in Coincidence Between EAS-TOP and LVD at Gran Sasso | 1993 | LNF-93-038.pdf | G. Azivino, S. Bianco, R. Casaccia, F. L. Fabbri, S. Sarwar, L. Votano, A. Zallo | |
| 5712 | 1993-06-29 | ON <a href='https://www.codecogs.com/eqnedit.php?latex=\\hat{sl}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\\hat{sl}' title='\\hat{sl}' /></a>(3) REDUCTION, QUANTUM GAUGE TRANSFORMATIONS, AND <i>W</i>- ALGEBRAS SINGULAR VECTORS. | 1993 | INFN-AE-93-14.pdf | P. Furlan, A.Ch. Ganchev, V.B. Petkova. | The problem of describing the singular vectors of <i>W</i><sub>3</sub> and <a href='https://www.codecogs.com/eqnedit.php?latex=W_{3}^{(2)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?W_{3}^{(2)}' title='W_{3}^{(2)}' /></a> Verma modules is addressed, viewing these algebras as BRST quantized Drinfeld-Sokolov (DS) reductions of <a href='https://www.codecogs.com/eqnedit.php?latex=A_{2}^{(1)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?A_{2}^{(1)}' title='A_{2}^{(1)}' /></a>. Singular vectors of an <a href='https://www.codecogs.com/eqnedit.php?latex=A_{2}^{(1)}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?A_{2}^{(1)}' title='A_{2}^{(1)}' /></a> Verma module are mapped into <i>W</i> algebra singular vectors and are shown to differ from the latter by terms trivial in the BRST cohomology. These maps are realized by quantum versions of the highest weight DS gauge transformations. |
| 3954 | 1993-06-28 | Transverse Beam Impendance Measurement. A New Coxial Method | 1993 | INFN-TC_93-10.pdf | M. Cardito, G. Di Massa, F. Galluccio, R. Losito, M.R. Masullo, V.G. Vaccaro | |
| 3955 | 1993-06-28 | Longitudinal Dynamics for Electrons in the Thermal Wave Model for Charged Particle Beams | 1993 | INFN-TC_93-11.pdf | R. Fedele, G. Miele, L. Palumbo | |
| 3956 | 1993-06-28 | A Numerical Check of the Thermal Wave-Model for Particle-Beam Dynamics | 1993 | INFN-TC_93-12.pdf | R. Fedele, G. Miele, F. Galluccio | |
| 5711 | 1993-06-22 | TRANSPUTER NETWORKS FOR THE ON-LINE ANALYSIS OF FINE-GRAINED ELECTROMAGNETIC CALORIMETER DATA. | 1993 | INFN-AE-93-13.pdf | G.L. Girotto, L. Lanceri, F. Scuri, E. Zoppolato. | Transputer networks, designed to perform parallel computations, are well suited for data acquisition, on-line analysis and second level trigger tasks in high energy physics experiments. Some simple algorithms for the analysis of fine-grained electromagnetic calorimeter data were implemented on two types of transputer networks and tested on real and simulated data from a silicon-tungsten calorimeter. Results are presented on the processing speed, measured in a test set-up, and extrapolations to a full size detector and data acquisition system are discussed. |
| 380 | 1993-06-21 | Two - Photon Physics Capabilities of KLOE at DAFNE | 1993 | LNF-93-030(P).pdf | G. Alexander, F. Anulli, D. Babusci, R. Baldini-Ferroli, M. Bassetti, S. Bellucci, I. Cohen, A. Courau, G. Giordano, G. Matone, A. Moalem, M. A. Moinester, G. Pancheri, M. Preger, L. Razdolkaja, P. SERGIO, P. TINI-BRUNOZZI, A. ZALLO | A feasibility study has been carried out for high precision measurements of two-photon reactions leading to hadrons at the DAPHNE electron-positron collider. This new facility will operate at a CM energy of 1.02 GeV and up to a maximum of 1.5 GeV. It will have a luminosity of L \\simeq 5x10^32 cm^-2 s^-1, 100 times larger than the present available e+e- colliders. DAPHNE offers an excellent opportunity to study \\gamma\\gamma reactions at low energy with high statistics, using the KLOE detector equipped with electron tagging facilities as described in this report. Among the various topics that one may address in these studies, we concentrate on the following: (1) Precision measurements of the polarizabilities of charged and neutral pions via the two-photon reactions \\gamma\\gamma\\rightarrow\\pi\\pi. These will allow tests of chiral theories and chiral perturbation techniques, as well as other theoretical approaches. (2) Measurements for the first time of the azimuthal correlations of the \\gamma\\gamma\\rightarrow\\pi\\pi and other two-photon reactions. This provides new tests of the validity of chiral and other theories. (3) Formation of the C = +1 light pseudoscalar mesons, \\pi^0, \\eta and \\eta'. This allows the study of the q\\overline{q} and possibly gg inner structure of these mesons. For the \\pi^0 its measured radiative width will also improve the currently known life-time. (4) The possibility to realize a double tagging at DAPHNE will allow reliable measurements of the total \\gamma\\gamma\\rightarrow hadrons cross section below 1 GeV, which currently is vaguely known to be compared with several models. The physics program described above cannot be realized without tagging the two-photon reactions to suppress the background from e+e- annihilation channels and other sources. |
| 381 | 1993-06-21 | First Measurement of the Neutron Electromagnetic Form Factor in the Time-Like Region | 1993 | LNF-93-031(P).pdf | A. Antonelli, R. Baldini, M. Bertani, M. E. Biagini, V. Bidoli, C. Bini, T. Bressani, R. Calabrese, R. Cardarelli, R. Carlin, C. Casari, L. Cugusi, P. Dalpiaz, G. De Zorzi, A. Feliciello, M. L. Ferrer, P. Ferretti, P. Gauzzi, P. Gianotti, F. Iazzi, E. Luppi, S. Marcello, A. Masoni, R. Messi, M. Morandin, L. Paoluzi, E. Pasqualucci, G. Pauli, F. Petrucci, M. Posocco, M. Preger, G. Puddu, M. Reale, L. Santi, R. Santonico, P. Sartori, M. Savrie', S. Serci, M. Spinetti, S. Tessaro, C. Voci | The first measurements of the neutron form factor in the time-like region has been performed by the FENICE experiment at the ADONE e+e- storage ring. Results at q^2 = 4.0 and 4.4 (GeV/c)^2, together with a new measurement of the proton form factor are presented here. |
| 3953 | 1993-06-21 | Multimac: un Sistema di Acquisizione Multiparametrico su Macintosh | 1993 | INFN-TC_93-9.pdf | A. Ordine, G.Spadaccini, M. Vigilante | |
| 3952 | 1993-06-15 | Ottimizzazione delle Condizioni di Irraggiamento per la Produzione del Radioisotopo Manganese–52g Mediante Reazioni (p,xn) E (d,xn) su Cromo di Composizione Isotopica Naturale | 1993 | INFN-TC_93-8.pdf | S. Saponaro, C. Birattari, M. Bonardi, M. Gallorini, F. Groppi | |
| 377 | 1993-06-14 | DAFNE - a New Tunable and Intense Source of Synchrotron Radiation in the Infrared Domain | 1993 | LNF-93-027(IR).pdf | A. Marcelli, P. Calvani | The construction of the new DAPHNE machine, at the Laboratori Nazionali di Frascati, addresses the question if competitive synchrotron radiation applications can be figured out for this non dedicated storage ring and which valuable or new research fields can be considered at least for the next five-ten years. Starting for the design parameters, some general considerations concerning the synchrotron radiation source requirements are outlined. Finallythe extraction of synchrotron radiation for experiments in the infrared energy range (5-5000 \\mu m) is discussed in more detail. |
| 3951 | 1993-06-14 | The 'CLAMSUD' Magnetic Spectrometer as a Pion Detector | 1993 | INFN-TC_93-7.pdf | A. Badalà, R. Barbera, F. Librizzi, D. Nicotra, A. Palmeri, G.S. Pappalardo, L. Platania, C. Rapicavoli, F. Riggi, A.C. Russo, M. Salemi, A. Santoro, R. Turrisi, A. Anzalone, L. Calabretta | |
| 3950 | 1993-06-09 | Dynque: A Computer code for Quench Simulation in Adiabatic Multicoil Superconducting Solenoid | 1993 | INFN-TC_93-6.pdf | M. Canali, L. Rossi | |
| 379 | 1993-05-27 | Studying Crystallization of Amorphous Metal Alloys NY Time-Resolved EXAFS | 1993 | LNF-93-029.pdf | F. D' Acapito, F. Boscherini, F. Buffa, G. Vlaic, G. Paschina, S. Mobilio | |
| 376 | 1993-05-26 | MICROX: Realizzazione di un Microscopio a Raggi X a Scansione | 1993 | LNF-93-026(IR).pdf | A. Balerna, E. Bernieri, R. Rinzivillo | In questo lavoro vengono illustrati i risultati ottenuti dall'esperimento MICROX. L'esperimento si proponeva la realizzazione di un microscopio a raggi X a scansione utilizzante la radiazione di sincrotrone prodotta nel wiggler dell'acceleratore di elettroni, Adone, dei LNF ed e' stato portato a compimento fino alla produzione del micro-spot di raggi X, necessario alla scansione del campione. Nel corso del lavoro vengono discusse le motivazioni che hanno condotto alla realizzazione di questo strumento, descritte le parti principali che lo costituiscono e riportati i risultati sperimentali relativi alle dimensioni ed al flusso del micro-spot di raggi X. |
| 378 | 1993-05-26 | Behavior of the Be and C Total Photonuclear Cross Section in the Nucleon Resonance Region | 1993 | LNF-93-028.pdf | M. Anghinolfi, V. Lucherini, P. Rossi, N. Bianchi, P. Corvisiero, A. Deppman, E. De Sanctis, A. Ebolese, A. Fantoni, G. Gervino, H. A. Gimm, P. Levi Sandri, L. Mazzaschi, V. Mokeev, V. Muccifora, E. Polli, A. R. Reolon, G. Ricco, M. Ripani, M. Sanzone, M. Taiuti, G. M. Urcioli, A. Zucchiatti | |
| 3918 | 1993-05-25 | Heavy Flavor Production and Decay: An Overview | 1993 | INFN-AE_93-12.pdf | Carlo Caso | |
| 374 | 1993-05-21 | Estimate of Small Angle Radiaive Bhabha Scattering at DAFNE | 1993 | LNF-93-024(P).pdf | G. Pancheri | A simple analytical formula is derived for the total rate of small angle radiative Bhabha scattering, using the no-recoil approximation. This expression illustrates how radiative processes soften the forward angle singularity so that the cross-section for all electrons which have radiated an energy larger that a given amount \\DeltaE, is only logarithmically divergent as m_e\\rightarrow 0. Estimate of the total integrated rate at a \\phi-factory are given, and a comparison is made with existing calculations. |
| 375 | 1993-05-21 | Campi Magnetici Statici, Metodi di Misura e Valutazione del Rischio | 1993 | LNF-93-025.pdf | A. Cattoni | |
| 5710 | 1993-05-18 | PRODUCTION OF STRANGE PARTICLES IN THE HADRONIC DECAYS OF THE Z<sup>O</sup>. | 1993 | INFN-AE-93-11.pdf | A. De Angelis. | A review or the experimental data on the production of strange particles from e<sup>+</sup>e<sup>-</sup> annihilations at the Z<sup>O</sup> peak is presented. The constraints to the models obtained from the experimental data are discussed, with emphasis on the information related to the nonperturbative regime of the generation of multihadronic final states. |
| 373 | 1993-05-12 | Ks Æ p+p-g: a Laboratory for Meson Dynamics | 1993 | LNF-93-023(P).pdf | G. D'Ambrosio, M. Miragliuolo, F. Sannino | We discuss the decay K_s\\rightarrow\\pi+\\pi-\\gamma in the framework of chiral perturbation theory. The direct emission in this decay can be an useful test of meson dynamics. |
| 371 | 1993-05-11 | FINUDA - A Detector for Nuclear Physics at DAFNE (out of print – esaurita) | 1993 | LNF-93-021(IR).pdf | M. Agnello, G. Belli, G. Bendiscioli, G. C. Bonazzola, E. Botta, T. Bressani, D. Calvo, P. Camerini, C. Cattaneo, N. Colonna, M. Corradini, S. Costa, G. D' Erasmo, F. D' Isep, A. Donzella, A. Feliciello, A. Filippi, V. Filippini, E. M. Fiore, L. Fiore, P. Gianotti, D. R. Gill, N. Grion, G. Guaraldo, A. E. Kuzimin, F. Iazzi, A. Lanaro, L. Lee, E. Lodi Rizzini, V. Lucherini, S. Marcello, G. M. Marshall, B. Minetti, P. Montagna, A. A. Nozdrin, A. Olin, A. Pantaleo, V. Piticchio, I. L. Pisarev, E. Rossetto, A. Rotondi, R. Rui, P. Salvini, B. Z. Serduyk, A. Sharma, G. Smith, S. Tessaro, L. Venturelli, S. Yen, A. Zenoni | We propose the construction of a detector dedicated to Nuclear Physics studies, called FINUDA, at DAFNE, the Frascati \Phi-Factory. The initial physics program is focused on the spectroscopy and decay modes of \Lambda-hypernuclei, which are produced following of tagged $K^{-}$ in nuclear targets. The unique property of kaons at DAFNE, coupled to the expected performances of FINUDA (momentum resolution of 0.2% FWHM, and dedicated triggers) will allow an unprecedented step forward concerning the precision of the measurements and, even more, the counting rates. At l = 10^32;\cm^-2 s^-1 we expect to produce and carefully study about 20 hypernuclei, most of them new. The puzzling situation regarding the validity of the \LambaI=1/2 rule for non-mesonic decays of hypernuclei will be hopefully clarified. FINUDA could also be used for measurements on low K=N interaction. |
| 372 | 1993-05-11 | N=2 Super Boussinesq Hierarchy: Lax Pairs and Conservation Laws | 1993 | LNF-93-022(P).pdf | S. Bellucci, E. Ivanov, S. Krivonos, A. Pichugin | We study the integrability properties of the one-parameter family of N = 2 super boussinesq equations obtained earlier by two of us (E.I.&S.K., Phys. Lett. B291 (1992) 63) as a hamiltonian flow on the N = 2 super-W_3 algebra. We show that it admits nontrivial higher order conserved quantities and hence gives rise to integrable hierarchies only for three values of the involved parameter, \\alpha = -2, -1/2, 5/2. We find that for the case \\alpha = -1/2 there exists a Lax pair formulation in terms of local N = 2 pseudo-differential operators, while for \\alpha = -2 the associated equation turns out to be bi-hamiltonian. |
| 370 | 1993-05-08 | X-Ray-Absorption Study of Rhenium L3 and L1 EDGE in ReO3: Multiple-Scattering Approach | 1993 | LNF-93-020.pdf | A. Kuzumin, J. Purans, M. Benfatto, C. R. Natoli | |
| 369 | 1993-05-07 | Test of the Electroweak Theory at LEP | 1993 | LNF-93-019(P).pdf | M. Pepe Altarelli | Recent data on precision tests of the Standard model at LEP are presented and compared to the theoretical expectations. The results include those obtained by a preliminary analysis of the data collected in the 1992 run. The data show excellent agreement with the Standard model. |
| 367 | 1993-04-30 | Photoproduction of High -PT Jets in Next-to-Leading Order QCD | 1993 | LNF-93-017(P).pdf | M. Greco, A. Vicini | Theh photoproduction of high pt jets at HERA energies is considered in next-to-leading order perturbative QCD. The cancellation of O(\\alpha_em\\alpha^2_S) dependence of the cross section on the factorisation scale M_\\gamma of the collinear singularities of the photon is shown explicity to occur when the direct and resolved photon terms are both considered. A detailed numerical analysis is presented and compared with previous studies, showing that the theoretical predictions are affected by large uncertainties related to the poorly known photon structure functions. Sizeable numerical differences in the analyses published so far are also emphasized. |
| 368 | 1993-04-30 | Test of PB/SCIFI Electromagnetic Calorimeter Prototypes with Low Energy Photons at LADON | 1993 | LNF-93-018(IR).pdf | B. Babusci, S. Bianco, R. Casaccia, L. Daniello, F. L. Fabbri, M. Giardoni, M. Lindozzi, L. Passamonti, V. Russo, S. Sarwar, L. Votano, A. Zallo, L. E. Casano, A. D' Angelo, D. Moricciani, F. Ghio, B. Girolami, D. Hertzog, S. Hughes, P. Reimer, R. Tayloe | In this work we report the complete set of measurements carried out at LADON on small size calorimeter modules composed of a uniform array of plastic scintillating fibers and lead (50:35 by volume ratio) for photons in the energy range 20-80 MeV. Calorimeter properties for both head-on and side-on incidence conditions have been investigated. With photons hitting the fibers laterally, an energy resolution of 4.8%/\\sqrt{E[GeV]} is obtained. This figure includes a 2%/\\sqrt{E[GeV]} term added in quadrature due to the photoelectron statistics. |
| 366 | 1993-04-29 | Estimation of Fluence Rate and Absorbed Dose Rate Due to Gas Bremsstrahlung from Electron Storage Rings | 1993 | LNF-93-016(P).pdf | A. Ferrari, M. Pelliccioni, P. R. Sala | Bremsstrahlung produced in electron storage rings by interactions with residual gas has been studied in the energy range 100-1000 MeV using the FLUKA code. Photon spectra and quantitative estimates of fluence rate and tissue absorbed dose rate are given. Simple equations are proposed for the fluence rate and the absorbed dose rate according to the results obtained. |
| 3949 | 1993-04-23 | WIDGET: A Data Acquisition System for a Balloon Borne Silicon Particle Calorimeters | 1993 | INFN-TC_93-5.pdf | F. Aversa, P. Battaiolo, V. Bidoli, A. Colavita, F. Fratnik, P. Picozza, S. Venkataraman | |
| 365 | 1993-04-21 | Deuteron Photodisintegration, Quark Gluon String Model and Regge Phenomenology | 1993 | LNF-93-015(P).pdf | L. A. Kondratyuk, E. De Sanctis, P. Rossi, N. Bianchi, A. B. Kaidalov, M. I. Krivoruchenko, P. Levi Sandri, V. Muccifora, E. Polli, A. R. Reolon, | We have derived an expression for the cross section for the \\gammad\\rightarrowpn reaction at small momentum transfers t and u in the framework of the quark-gluon model Regge phenomenology. Our predictions reproduce very well the few data available at energies between 1.5 and 4.2 GeV, where our approach can be applied. Moreover, we found a good agreement also with the forward and backward angle data in the intermediate energy region. |
| 5708 | 1993-04-21 | EXCHANGE RELATIONS AND CORRELATION FUNCTIONS FOR A QUANTUM PARTICLE ON THE <i>SU</i><sub>2</sub> GROUP MANIFOLD. | 1993 | INFN-AE-93-9.pdf | P. Furlan, Y.S. Stanev, L.T. Todorov. | We consider the <i>SO</i><sub>4</sub> invariant quantum dynamics of a point particle moving on the 3-sphere (or equivalently, of the relative motion of the spherical top). Quantum exchange relations for different times are derived with an 'R matrix' depending on the time difference and on the conserved angular momentum. Their implications for correlation functions are spelled out. The chiral exchange relations of Alekseev and Faddeev [1] are also extended to different times. |
| 364 | 1993-04-20 | Study of the Parasitic Mode Absorbers for the Frascati F-Factory RF Cavities | 1993 | LNF-93-014(P).pdf | R. Boni, V. Chimenti, A. Clozza, A. Gallo, G. Raffone, C. Vaccarezza | A twin ring electron-positron collider Φ-Factory DAΦNE is in construction at FrascatiNational Laboratories. The machine is designed to store high current multibunch beams at theenergy of 510 MeV. High luminosity through multibunch operation is the main goal of theaccelerator. The accumulation of 30 bunches per beam is the first objective. Longitudinalinstability is among the most troublesome problems in such a multibunch machine; extractionand damping of the cavity High Order Mode (HOM) wake fields induced by the chargedparticles is of primary importance. In this article we report about the R&D in progress tocouple out and absorb the parasitic HOMs of the DAΦNE accelerating cavities. |
| 3948 | 1993-04-13 | The Spin-Slitter Concept | 1993 | INFN-TC_93-4.pdf | M. Conte, Y. Onel, A. Penzo, A. Pisent, M. Pusterla, R. Rossmanith | |
| 3946 | 1993-04-08 | Critical Current Measurements at LASA Laboratory | 1993 | INFN-TC_93-2.pdf | L. Gini, A. Leone, D. Pedrini, L. Rossi, G. Volpini | |
| 3947 | 1993-04-08 | Contruction and Calibration of an Apparatus for Mangnetoresistance Measurments of Filaments and Wires in the Temperature Range 1.7 - 300 K and Magnetic Field up to 15 Tesla | 1993 | INFN-TC_93-3.pdf | E. Acerbi, G.F. Ambrosio, L. Rossi | |
| 363 | 1993-04-01 | THE gg Æ popo CONTRIBUTION TO THE PROCESS e+e- Æ e+e-popo | 1993 | LNF-93-013(P).pdf | S. Bellucci, G. Colangelo | We consider the O(p^4) predictions of Chiral Perturbation Theory (\\chiPT) in the process \\gamma\\gamma\\rightarrow\\pi^0\\pi^0, together with the study of the existing experimental measurements and the planned new ones. At the Frascati \\Phi-factory DAPHNE the rate of the events e+e-\\pi^0\\pi^0 is large enough to allow for a measurement of the cross section with a good statistical sensitivity. However, a quantitative analysis of the commonly used approximation of considering only real photons for the detection of the \\gamma\\gamma\\rightarrow\\pi^0\\pi^0 signal is still lacking. This motivates us to compute the cross section in _\\chiPT for the production of \\pi^0 pairs due to off-shell photons. A measurement of the azymuthal correlations would test the higher order _\\chiPT corrections independently from the measurement of the cross section. We approximate these corrections by including the contribution of the low-lying vector resonances in the scattering amplitude. |
| 5707 | 1993-03-29 | ONE LOOP CORRECTIONS TO THE LIGHTEST HIGGS MASS IN THE MINIMAL η MODEL | 1993 | INFN-AE-93-8.pdf | D. Comelli, C. Verzegnassi. | We have evaluated the one loop correction to the bound on the lightest Higgs mass valid in the minimal, <i>E</i><sub>6</sub> based, supersymmetric <a href='https://www.codecogs.com/eqnedit.php?latex=\eta' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\eta' title='\eta' /></a> model. Under the assumption that the theory remains perturbative up to the 10<sup>16</sup> GeV scale, we derive a conservative bound that decreases with the top mass for M<sub>t</sub> <a href='https://www.codecogs.com/eqnedit.php?latex=\leq' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\leq' title='\leq' /></a> 2M<sub>W</sub> and varies from ~ 160 GeV to ~ 145 GeV when 90 <a href='https://www.codecogs.com/eqnedit.php?latex=\leq' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\leq' title='\leq' /></a> M<sub>t</sub> <a href='https://www.codecogs.com/eqnedit.php?latex=\leq' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\leq' title='\leq' /></a> 200 GeV. |
| 3945 | 1993-03-26 | An apparatus fot Thermal Conductivity Measurements at Cryogenic Temperature on Coil Blocks | 1993 | INFN-TC_93-1.pdf | F. Broggi, S. Piuri, L. Rossi | |
| 362 | 1993-03-09 | Composite Gauge Fields in Renormalizable Models | 1993 | LNF-93-012(IR).pdf | F. Palumbo | We construct models of gauge theories renormalizable by power counting in four dimensions, with gauge fields composite of bosonic or fermionic constituents. They are obtained by a regularization of CP^n-1 models where the constraint on constituent fields is replaced by a constraint on expectation values. |
| 3935 | 1993-03-09 | Measurement of the Birefrigerence Properties of the Reflection Surface of an Interferential Mirror | 1993 | INFN-BE_93-2.pdf | P. Micossi, F. Della Valle, E. Milotti, C. Rizzo, G. Ruoso, E. Zavattini | |
| 5706 | 1993-03-09 | NON LOGARITHMIC TERMS IN THE STRONG FIELD DEPENDENCE OF THE PHOTON PROPAGATOR. | 1993 | INFN-AE-93-7.pdf | G. Calucci, R. Ragazzon. | Motivated by some speculations on a possible new phase of QED we study the modifications of the electromagnetic coupling in the presence of a strong external magnetic field. The anisotropy of the space induced by the applied field is explicitly taken into account. The result is described in terms of an isotropic logarithmic factor, as generally expected, plus a directional term showing an unusual linear dependence on the external field. This last term is the most important in the limit of strong static fields and it always tends to reduce the effective coupling. The present calculation provides more general grounds to an analogous statement already derived in a previous analysis. PACS numbers: 12.20.Ds, 25.75.+r |
| 360 | 1993-03-08 | “USVAS” Nuovo e Versatile Apparato di Diffusione ad Angolo Variabile Ultra-Piccolo con Luce di Sincrotrone | 1993 | LNF-93-010(IR).pdf | A. La Monaca, E. Burattini, F. Rustichelli | Viene descritta la possibilita' di allestire un nuovo versatile apparato di diffusione ad angolo variabile ultra-piccolo con luce di sincrotrone di DAPHNE per lo studio di particelle di grandezza quasi-micrometrica, nanocristalli e in aggregati di materia condensata (superparticelle organizzate anche in forma multi-frattale) le cui conformazioni non possono essere investigate con i metodi e gli apparati tradizionali. Il nuovo strumento consiste di un sistema alla Bonse-Hart a geometria variabile e di un apparato di rivelazione che usi principalmente il rivelatore a camera a drift nella sua avanzata versione, gia' operante con la luce di sincrotrone di Frascati, ed opportuni rivelatori a CCD retro-illuminati con acquisizione dell'immagine diffusa anche in tempo reale. |
| 361 | 1993-03-08 | A Critical View of Radiation Protection Quantities for Monitoring External Irradiation | 1993 | LNF-93-011.pdf | M. Pelliccioni, M. Silari | |
| 5709 | 1993-03-03 | METAPLECTIC SPINOR FIELDS ON PHASE SPACE: A PATH-INTEGRAL APPROACH. | 1993 | INFN-AE-93-10.pdf | E. Gozzi, M. Reuter. | In this paper we study spinor fields on the phase-space of a generic hamiltonian system. Under linearized canonical transformations these spinors transform according to the metaplectic representation of <i>Sp</i>(2<i>N</i>). We derive a path-integral for their time evolution and discuss their dynamical and geometrical properties. In particular we show that they can be interpreted as semiclassical wave-functions for the associated hamiltonian. |
| 359 | 1993-02-26 | Broad-Band Model Impedance for DAFNE Main Rings | 1993 | LNF-93-009(P).pdf | S. Bartalucci, L. Palumbo, M. Serio, B. Spataro, M. Zobov | A recently proposed model has been used to describe the broad-band impedance of the vacuum components of the DAPHNE storage rings. Numerical calculations of the loss factor and the wake potential in the time and frequency domain are in good agreement with the model predictions. |
| 358 | 1993-02-16 | Slater’s Theorem for Magnetic Mirror Boundary Perturbations | 1993 | LNF-93-008(P).pdf | M. Ferrario | A general form of Slater's formula, taking into account perturbations of Electric as well as Magnetic Mirror boundaries is presented. The frequency shift induced by the Magnetic Mirror perturbation has the opposite sign to that of the Electric one. |
| 357 | 1993-02-12 | Interference Between Past and Future Events in F Æ K anti K Decays | 1993 | LNF-93-007(P).pdf | Y. N. Srivastava, A. Widom | The Einstein-Tolman-Podolsky (ETP) effect showing the quantum interference of amplitudes for past future (time-like separated) events is discussed for a proposed experiment on the \\Phi\\rightarrow K\\overline{K} decay processes. Within the proposed resolution of the experiment, and the known magnitudes of CP violating amplitudes, the ETC effect may be susceptible to laboratory tests. |
| 3934 | 1993-02-10 | Double Pion Photoproduction Using the Daphne Detector: Preliminary Results | 1993 | INFN-BE_93-1.pdf | S. Altieri, A. Braghieri, P. Pedroni, T. Pinelli | |
| 3942 | 1993-02-10 | More About the Time Analysis of Tunneling Processes (PACS.: 73.40.Gk; 03.80.+r; 03.65.Bz) | 1993 | INFN-FM_93-2.pdf | V.S. Olkhovisky, E. Recami | |
| 3912 | 1993-02-10 | About Zitterbewegung and Electron Structure (PACS.: 03.70.+k; 11.10.Qr; 14.60.Cd) | 1993 | INFN-AE_93-6.pdf | W.A.Rodrigues Jr., J. Vaz Jr., E. Recami | |
| 3941 | 1993-02-09 | Intergranular Flixons in HTSC | 1993 | INFN-FM_93-1.pdf | R. Vaccarone, M. Gaspari | |
| 356 | 1993-02-08 | On Line Calorimetric Measurement of the Quality Factor of Superconducting Accelerator Cavities | 1993 | LNF-93-006(P).pdf | M. Castellano, L. Catani, M. De Giorgi, M. Ferrario, G. Fuga, S. Kulinski, M. Minestrini, P. Patteri, S. Tazzari, F. Tazzioli | A comparatively precise method to measure the Q factor of installed superconducting cavities is described. Data taken on the cavities of the 25 MeV SC linac LISA, at Frascati, are presented. |
| 355 | 1993-02-05 | Total Photonuclear Cross Section in the Nucleon Resonance Region | 1993 | LNF-93-005(P).pdf | N. Bianchi, A. Deppman, E. De Sanctis, A. Ebolese, A. Fantoni, P. Levi Sandri, V. Lucherini, V. Muccifora, E. Polli, A. R. Reolon, P. Rossi, M. Anghinolfi, P. Corvisiero, L. Mazzaschi, V. Mokeev, G. Ricco, M. Ripani, M. Sanzone, M. Taiuti, A. Zucchiatti, G. Gervino | We present the results of measurements of the total photonuclear absorption of light, medium-heavy and heavy nuclei carried on at Frascati with 200-1200 MeV monochromatic photons, to obtain information on the excitation of baryon resonances in nuclei and on the possible onset of the shadowing effect. The results show no evidence of baryon resonances at about 700 and about 1000 MeV seen in the photon absorption on the proton and the deuteron. |
| 354 | 1993-02-04 | The Microcanonical Fermionic Average Method for Monte Carlo Simulations of Lattice Gauge Theories with Dynamical Fermions | 1993 | LNF-93-004(P).pdf | V. Azcoiti, V. Laliena, X. Q. Luo, C. E. Piedrafita, G. Di Carlo, A. Galante, A. F. Grillo, L. A. Fernandez, V. Vladikas | In this article we present a comprehensive exposition of a method for performing numerical simulations of lattice gauge theories with dynamical fermions. Its main aspects had been presented elsewhere. This work is a systematic study of the feasibility of the method, which amounts to separating the evaluation of the Fermionic Determinant from the generation of gauge configurations through a microcanonical process. The main advantage consists in the fact that the parts of the simulation which are most computer intensive must not be repeated when varying the parameters of the theory. Moreover we achieve good control over critical slowing down, since the configurations over which the determinant is measured are always very well decorrelated; in addition, the actual implementation of the method allows us to perform simulations at exactly zero fermion mass. We relate the numerical feasibility of this approach to an expansion in the number of flavours; the criteria for its convergence are analyzed both theoretically and in connection to physical problems. On more speculative grounds, we argue that the origin of the applicability of the method stems from the non locality of the theory under consideration. |
| 3911 | 1993-02-02 | Performance of E771 RPC muon detector | 1993 | INFN-AE_93-5.pdf | G. Cataldi, P. Creti, V. Elia, G. Fiore, E. Gorini, F. Grancagnolo, M. Panareo, C. Pinto, L. Antoniazzi, G. Corti1, G. Introzzi, A. Lanza, G. Liguori, P. Torre | |
| 3908 | 1993-01-25 | Neutral Higgs Boson Search in a Two Doublet Model | 1993 | INFN-AE_93-2.pdf | G. Corsetti | |
| 3909 | 1993-01-25 | Search for Higgs Bosons at LEP | 1993 | INFN-AE_93-3.pdf | G. Corsetti | |
| 5705 | 1993-01-25 | EIKONAL DIAGRAMS IN MULTIPARTON SEMI-HARD INTERACTIONS. | 1993 | INFN-AE-93-4.pdf | G. Calucci, D. Treleani. | We study the set of eikonal diagrams, derived from perturbative QeD, at the lowest order in the coupling constant and with vacuum quantum number exchange, in the three body interaction of a high energy projectile parton with two different target partons. The contribution to the semi-hard component of the inelastic cross section is worked out by evaluating the leading behavior of all the dominant cut diagrams. The different cut amplitudes are shown to be proportional to one another, with the same weights of the cutting rules which have been derived in the context of multi-pomeron exchange. As a consequence of the dominant configuration in the loop integrals, corresponding to the projectile parton on shell between successive interactions, the process is represented by the simplest probabilistic picture, where the three-body interaction is factorized as the product of two-body interaction probabilities. |
| 353 | 1993-01-22 | DAFNE and Other Topics in Particle Physics | 1993 | LNF-93-003.pdf | A A. V V. | The Meeting on DAPHNE and Other Topics in Particle Physicstook place in Frascati, at the INFN National Laboratories, from November 18 to November 20, 1993, and was part of the series of Congressini di Fenomenologia previously held in Torino, Perugia, Trieste, Bari and Rome (Accademia dei Lincei). This year the meeting coincided with the completion of the DAPHNE Physics Handbook by the DAPHNE Theory Working Group. The meeting was dedicated to illustrate the results of this effort and to assess the progress of theoretical and experimental work at the Frascati Laboratories, as they are on the verge of starting the DAPHNE program. Copies of the trasparencies prepared for the meeting are collected in this volume. In presenting them, we would like once more to thank all the participants to the Meeting and, last but not the least, the Frascati staff who contributed to organize it with dedication and enthusiasm. |
| 352 | 1993-01-21 | The KLOE Detector – Technical Proposal | 1993 | LNF-93-002(IR).pdf | KLOE Collaboration | |
| 351 | 1993-01-11 | Bose-Einstein Effect in the K0 anti K0 Boson-Antiboson System | 1993 | LNF-93-001(P).pdf | G. Alexander | It is shown that a Bose-Einstein effect, observed in a pair of identical bosons when emitted in the same phase space region, will also occur in the C=+1 sub-sample of spinless boson-antiboson pairs. This is illustrated by the recent OPAL study of Bose-Einstein Correlation using inclusive Z^0 hadronic decays into K^0_3K^0_3 pairs. The possible impact of this effect on the coupled channel analyses carried out to determine the branching ratio of f_0(975)\\rightarrow K\\overline{K} is discussed. |
| 3907 | 1993-01-04 | Elettronica di elaborazione ed acquisizione dei segnali per misure sistematiche delle proprietà di fibre ottiche scintillanti | 1993 | INFN-AE_93-1.pdf | S. Buontempo, L. Parascandolo, P. Parascandolo, F. Riccardi | |
| 539 | 1992-12-23 | EVALUATION OF RADIATION SKYSHINE FROM THE MAIN RINGS OF THE DAFNE PROJECT | 1992 | LNF-92-111(IR).pdf | A. FASSO', M. PELLICCIONI | To properly design the roof shielding for the Main Rings of the DAPHNE Project, the dose equivalents due to the skyshine effect as a function of distance from the machine building and of the altitude have been evaluated. The calculations, for both neutron and photons, were performed in two steps: source definition and radiation transport. For the first step the code used was FLUKA. The transport of the emitted particles was simulated using the CERN version of the MORSE code. From the results obtained two alternatives are suggested: - a roof covering the sections of the machine without local shields; - the removal of the windows existing in the building housing the machine. |
| 540 | 1992-12-23 | EVALUATION OF RADIATION SKYSHINE FROM THE DAMPING RING OF THE DAFNE PROJECT | 1992 | LNF-92-112(IR).pdf | A. FASSO', M. PELLICCIONI | To safely dimension the top shielding for the Damping Ring of the DAPHNE Project, the neutron dose equivalents due to the skyshine effect as a function of distance from the machine building and of the altitude have been evaluated. The calculations were performed in two steps: Source definition and radiation transport. For the first step the code used was FLUKA. The transport of the emitted particles was simulated using the CERN version of the MORSE code. From the results obtained, it can be concluded that a 40 cm thick concrete roof makes the skyshine contribution to dose in the environment negligible, in normal operating conditions. |
| 541 | 1992-12-23 | EXAFS STUDIES ON NANOCRYSTALLINE MATERIALS WITH DOPED GRAIN BOUNDARIES | 1992 | LNF-92-113.pdf | F. BOSCHERINI, T. HAUBOLD, S. PASCARELLI, S. MOBILIO, H. GLEITER | We present an EXAFS study of the local environment of Co dopant atoms in nanocrystalline Cu. Due to the low solubility of Co atoms in bulk Cu, these measurements yield information on the local atomic structure of grain boundaries in nanocrystalline Cu. Previous EXAFS studies on pure nanocrystalline metals have indicated an atomic arrangement in the grain boundary component exhibiting a broad distribution of interatomic spacings which differs from the atomic structure of the crystalline or glassy state. In the present investigation a significantly reduced coordination number around Co is found; also, the first shell bond length varies with dopant concentration from that typical of Co substitutional impurities in Cu to that of bulk Co. These results suggest that Co atoms substitute Cu atoms both in the disordered grain boundaries and in the lattice of the Cu-crystallites and/or form Co-precipitates. |
| 535 | 1992-12-16 | COMMISSIONING AND PERFORMANCE of A LOW EMITTANCE, LONG PULSE ELECTRON GUN FOR THE SC LINAC LISA | 1992 | LNF-92-107(P).pdf | M. CASTELLANO, S. KULINSKY, P. PATTERI, F. TAZZIOLI, M. VESCOVI, N. CAVALLO, F. CEVENINI | A 25 MeV superconducting linear accelerator (LISA) is in construction in the Frascati INFN Laboratories. Here we describe the design and measured performances of the electron gun, that can deliver 200 mA dc at 100 kV with normalized emittance of less than 10-5 m rad. |
| 536 | 1992-12-16 | CORRECTIONS TO KÆ pgg FROM K Æ 3p | 1992 | LNF-92-108(P).pdf | L. Cappiello, G. D' Ambrosio, M. Miragliuolo | In the framework of chiral perturbation theory we compute the \\DeltaI = 3/2 contribution to K_L \\rightarrow \\pi^0\\gamma\\gamma. As for the \\DeltaI = 1/2 transition, the result turns out to be unambiguously predicted and finite. We discuss also the effects on this decay coming from O(p^4) corrections to K\\rightarrow 3\\pi. As a by-product we have also a prediction for the CP conserving amplitude A(K_L\\rightarrow\\pi^0 e+e-). |
| 537 | 1992-12-16 | ON ppbar DECAY WIDTHS OF HEAVY QUARKONIUM STATES | 1992 | LNF-92-109(IR).pdf | P. VOLKOVITSKY | We discuss the decay widths and branching ratios of charmonium and bottomonium levels into \\overline{p}p final states. The value of these widths and corresponding branching ratios determine quarkonia production cross-sections as s-channel resonances in \\overline{p}p annihilation. From the known values of charmonia decay widths into different channels and usin non-relativistic formulas for S-,P- and D-state transitions into gluons we obtain the predictions for decay widths of ^1P_1, and ^3D_1 charmonium levels into \\overline{p}p final state. To estimate \\overline{p}p decay widths for ^3P_0, ^3D_2, ^3D_3 and ^1D_2 charmonium levels we mada some plausible assumptions on dependence of the amplitude of gluon transition into \\overline{p}p state on angular momentum and parity. Than, using the energy behaviour of the amplitude of \\overline{p}p annihilation into gluons given by non-perturbative quark-gluon model we come to estimates of \\overline{p}p decay widths and branching ratios for 2^1S_0 level of charmonium and S- and P-levels of bottomonium. |
| 538 | 1992-12-16 | LARGE N LATTICE QED | 1992 | LNF-92-110(P).pdf | V. AZCOITI, G. DI CARLO, A. F. GRILLO | We study the \\beta,N critical behaviour of non compact QED with N species of light fermions, using a method we have proposed for unquenched simulations. We find that there exist two phase transition lines: one, second order, and the other, first order, that approaches asymptotically the \\beta = 0 axis. These two lines have different physical origin, the second one being entirely due to fermions effects. We discuss the effect of the approximation used, in terms of an expansion of the effective action in powers of N, and conclude that the general features should not be affected by this approximation. |
| 534 | 1992-12-14 | IL DATA ACCESS LANGUAGE COME STRUMENTO DI ACCESSO A DATABASE SU HOST VMS O OS/400 DA CLIENTI MACINTOSH | 1992 | LNF-92-106(NT).pdf | O. CIAFFONI, M. MARSELLA | ABSTDatar experience with DAL, the Apple technology for host-based data access from Macintosh clients. At Laboratori Nazionali di Frascati, two pilot applications have been developed in order to investigate the possibilities offered by DAL. A library management and access application has been developed with HyperCard based front-end to allow title searching from library users' Macintosh. The HyperCard stack works with a Rdb database on a MicroVAX. The second application takes advantage of the new DAL for AS/400 IBM minicomputers. The task at hand was to devise a simple Clear Access application to enable group leaders to obtain information about group budget status. |
| 3906 | 1992-12-11 | Generatore di Sincronismi per Telecamera in FPGA | 1992 | INFN-TC_92-28.pdf | A. Aloisio D. della Volpe P. Parascandolo | |
| 533 | 1992-12-04 | “NAUTILUS” THE FIRST ULTRACRYOGENIC GRAVITATIONAL WAVE DETECTOR | 1992 | LNF-92-105(P).pdf | P. ASTONE, M. BASSAN, P. BONIFAZI, E. COCCIA, C. COSMELLI, V. FAFONE, S. FRASCA, E. MAJORANA, A. MARINI, I. MODENA, G. MODESTINO, G. V. PALLOTTINO, G. PIZZELLA, P. RAPAGNANI, F. RICCI, F. RONGA, G. VANNARONI, M. VISCO, L. VOTANO | We report the ultralow temperature resonant gravitational wave antenna NAUTILUS of the Rome group. The goal of this antenna is to detect bursts of gravitational radiation from sources located at distances up to the Virgo cluster of galaxies. In the first cryogenic test of this detector at ultralow temperatures, performed in 1991, the M=2350 kg, Al 5056 cylindrical bar has been cooled to a temperature of 95 mK. The detector is now installed at its operating site in the Frascati INFN Laboratories, where it has been placed on a special rotating platform. NAUTILUS is equipped with a resonant capacitive transducer and a dc SQUID preamplifier and is completed with seismic, electromagnetic and cosmic ray veto systems. It should start operating in 1993. |
| 530 | 1992-12-03 | BREMSSTRALUNG SOURCE TERMS FOR INTERMEDIATE ENERGY ELECTRON ACCELERATORS | 1992 | LNF-92-102(P).pdf | A. FERRARI, M. PELLICCIONI, P. R. SALA | Monte Carlo calculations of bremsstrahlung produced in targets bombarded by electrons with energies between 100 MeV ana 1 GeV have been performed with the code FLUKA. The following informations have been obtained: maximum dose equivalent per unit power at 0^ and 90^; maximum yield of radioactive gas (^15 0 and ^13 ?N) produced in air. Comparisons with experimental data and other Monte Carlo calculations are also included. |
| 531 | 1992-12-03 | MEASUREMENTS OF EXCESS HEAT AND TRITIUM DURING SELF-BIASED PULSED ELECTROLYSIS OF Pd-D2O | 1992 | LNF-92-103(P).pdf | F. CELANI, A. SPALLONE, P. TRIPODI, A. NUVOLI | Following the Takahashi results about large excess heat by pulsed electrolysis, we built a gas-closed flow calorimeter to perform pulsed current electrolysis. Some blank tests, using Au plate cathode, were carried out to characterize the system. Four cold-worked Pd sheets were tested and two of them produced 7.5% and 6% of mean excess heat for many weeks. The others Pd sheets did not produce excess heat though one of them, after a deuterium re-loading, gave up to +25% of excess heat by only for few hours. Tritium analysis was carried out and some coincidence between tritium production and excess heat was found. |
| 532 | 1992-12-03 | CRITICAL CURRENTS IN NbZr SUPERCONDUCTING THIN FILMS | 1992 | LNF-92-104(P).pdf | U. GAMBARDELLA, D. DI GIOACCHINO, V. BOFFA, G. PATERNO', S. BARBANERA, F. MURTAS | Nb_0.75 Zr_0.25 thin films have not yet been investigated in all the features that may come from their higher critical temperature compared to other Nb alloys. In this work we present the fabrication of Nb_0.75 Zr_0.25 thin films by sputtering which showed critical temperature as high as 10.5 K. We also present transport critical current measurements on Nb_0.75 Zr_0.25 films whose geometries were photolitographically defined in the \\mu m range. The measurement were performed as a function both of the temperature and of the magnetic field up to 6 Tesla. The temperature behaviour is compared with the Kim-Anderson model, while the magnetic field behaviour of the resulting pinning force has been compared with existing models. |
| 5704 | 1992-11-30 | A MEASUREMENT OF THE VACUUM BIREFRIGERENCE INDUCED BY A MAGNETIC FIELD WITH HIGH ENERGY PHOTONS. | 1992 | INFN-AE-92-30.pdf | G. Cantatore, F. Della Valle, E. Milotti, C. Rizzo. | In QED photons interact - very weakly - with a magnetic field. This paper summarizes the physics motivations for trying to detect this minute effect, and presents a set-up to measure it with high energy photons obtained by Compton backscattering an intense visible laser beam off an electron beam. Such a set-up might eventually be used in a machine like the proposed EEF. |
| 5703 | 1992-11-30 | RADIATIVELY CORRECTED BOUND ON THE LIGHT HIGGS MASS IN A MINIMAL NON MINIMAL SUPERSYMMETRIC STANDARD MODEL. | 1992 | INFN-AE-92-29.pdf | D. Comelli. | The neutral Higgs sector of the Minimal non Minimal Supersymmetric Standard Model is considered. By effective potential and R.G.E. supported method; an upper bound of the lightest Higgs is analysed. From the request of perturbativity of the coupling in the superpotential, adding the leading stop top contributions, the absolute bound of ~ 130 GeV for 90<i>GeV</i> < m<sub>t</sub> < 180<i>GeV</i> and <a href='https://www.codecogs.com/eqnedit.php?latex=M_{\bar{t}}\simeq' target='_blank'><img src='https://latex.codecogs.com/gif.latex?M_{\bar{t}}\simeq' title='M_{\bar{t}}\simeq' /></a> 1000 GeV is derived. The interesting dependence on <a href='https://www.codecogs.com/eqnedit.php?latex=m_{t}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?m_{t}' title='m_{t}' /></a>, for <a href='https://www.codecogs.com/eqnedit.php?latex=\tan&space;\beta&space;\rightarrow' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\tan&space;\beta&space;\rightarrow' title='\tan \beta \rightarrow' /></a> 1 is discussed. |
| 529 | 1992-11-25 | Upper Limit for Nuclearite Flux from the Rome Gravitational Wave Resonant Detectors | 1992 | LNF-92-101(P).pdf | P. ASTONE, M. BASSAN, P. BONIFAZI, E. COCCIA, C. COSMELLI, V. FAFONE, S. FRASCA, E. MAJORANA, I. MODENA, G. V. PALLOTTINO, G. PIZZELLA, R. RAPAGNANI, F. RICCI, F. RONGA, M. VISCO | Flux limits for nuclearites at sea level are given, making use of the resonant gravitational wave detector Explorer. It is found, at 90% confidence, there are less thann 1.8 10^12 cm^-2 sr^-1 s^-1 with \\beta ranfe from 1 to 0.001. |
| 528 | 1992-11-24 | ELECTROWEAK PHYSICS WITH b QUARKS AT LEP | 1992 | LNF-92-100(P).pdf | P. CAMPANA | The four LEP experiments have collected up to now about 1 million of b flavoured hadrons. This amount of data can be used to test the Electroweak Sector of the Standard Model, with the measurements of \\Gamma_b\\overline{b} and A^b_FB. A summary of b tagging techniques is given, with a particular emphasis on the detection of laptons from semileptonic decay of b quarks. Detector performances, sample purities and identification efficencies are reviewed, together with a discussion of the systematical errors. The latest results from the four LEP Collaborations in the determination of \\Gamma_b\\overline{b}, A^b_FB, and B^0 - \\overline{B^0} mixing are presented. |
| 527 | 1992-11-23 | MULTI-FIELD COSET SPACE REALIZATIONS OF w1+oo | 1992 | LNF-92-099(P).pdf | S. BELLUCCI, E. IVANOV, S. KRIVONOS | We extend the coses spaces space formulation of the one-field realization of \\omega_1+oo to include more fields as the coset parameters. This can be done either by choosing a smaller stability subalgebrain the nonlinear realization of \\omega_1+oo symmetry, or by considering a nonlinear realization of some extended symmetrym or by combining both options. We show that all these possibilities give rise to the multi-field realizations of \\omega_1+oo. We deduce the two-field realization of \\omega_1+oo proceeding from a coset space of the symmetry group G which is an extension of \\omega_1+oo by the second self-commuting set of higher spin currents. Next, starting with the unexpected \\omega_1+oo but placing all its spin 2 generators into the coset, we obtain a new two-field realization of \\omega_1+oo which essentially involves a 2D dilaton. In order to construct the invariant action for this system we add one more field and so get a new three-field realization of \\omega_1+oo. We re-derive it within the coset space approach, by applying the latter to an extended symmetry group G which is a nonlinear deformation of G. Finally we present some multi-field generalizations of our three-field realization and discuss several intriguing parallels with N=2 strings and conformal affine Toda theories. |
| 3905 | 1992-11-20 | Serse, a Superconducting Electron Cyclotron Resonance Ion Source | 1992 | INFN-TC_92-27.pdf | G. Ciavola S. Gammino | |
| 525 | 1992-11-17 | A NEW MEASUREMENT OF J/Y Æ n nbar | 1992 | LNF-92-097(P).pdf | A. ANTONELLI, R. BALDINI, M. BERTANI, M. E. BIAGINI, V. BIDOLI, C. BINI, T. BRESSANI, R. CALABRESE, R. CARDARELLI, R. CARLIN, C. CASARI, L. CUGUSI, P. DALPIAZ, G. DE ZORZI, A. FELICIELLO, M. L. FERRER, P. FERRETTI, P. GAUZZI, P. GIANOTTI, F. IAZZI, E. LUPPI, S. MARCELLO, A. MASONI, R. MESSI, M. MORANDIN, L. PAOLUZI, E. PASQUALUCCI, G. PAULI, F. PETRUCCI, M. POSOCCO, M. PREGER, G. PUDDU, M. REALE, L. SANTI, R. SANTONICO, P. SARTORI, M. SAVRIE, S. SERCI, M. T. SERGI, M. SPINETTI, S. TESSARO, C. VOCI | A new measurement of the branching ratio of J\\psi\\rightarrow n\\overline{n}, B_n\\ovrerline{n} = (1.90+-0.55) x 10^-3, has been achieved by the FENICE detector at the e+e- storage ring ADONE in Frascati. |
| 526 | 1992-11-16 | NON-COMPACT GAUGE FIELDS ON THE LATTICE | 1992 | LNF-92-098(P).pdf | F. PALUMBO | A noncompact regularization of gauge theories is presented where exact gauge invariance at finite lattice spacing is obtained by means of an auxiliary field which decouples in the continuum limit. The result of the evaluation of the renormalization scale parameter and of the string tension are reported, showing the same evidence for confinement as in Wilson's scheme.The new regularization is used to define composite gauge fields. |
| 3904 | 1992-11-16 | Resistive Plate Counters for the SDC Muon System | 1992 | INFN-TC_92-26.pdf | V. Arena G. Boca M. Cambiaghi G. Gianini G. Introzzi G. Liguori S. Ratti C. Riccardi P. Torre P. Vitulo | |
| 3865 | 1992-11-11 | Spin and Electron Structure | 1992 | INFN-AE_92-27.pdf | M.Pavsic E. Recami W.A. Rodrigues Jr. G.D. Maccarone F. Raciti G. Salesi | |
| 3866 | 1992-11-11 | A Cryogenic Experiment for Solar Neutrino Spectroscopy and Search for Dark Matter | 1992 | INFN-AE_92-28.pdf | A. Alessandrello E. Bellotti C. Brofferio D.V. Camin C. Cattadori O. Cremonesi E. Fiorini A. Giuliani M. Pavan G. Pessina E. Previtali L. Zanotti | |
| 5702 | 1992-11-05 | IL CALORIMETRO VISUALIZZANTE A FIBRE SCINTILLANTI DELL'ESPERIMENTO KLOE. | 1992 | INFN-AE-92-26.pdf | A. Martinis. | La teoria unificata delle interazioni deboli ed elettromagnetiche in questi ultimi anni ha ottenuto ampio riscontro sperimentale: una delle conferme più spettacolari si e avuta con la scoperta della particella Z<sup>o</sup>, uno dei mediatori della 'forza debole', ad opera di C. Rubbia al CERN di Ginevra. Vi sono dei piccoli effetti che, tuttavia, richiedono un'ulteriore e approfondita analisi: uno di questi è la violazione dell'invarianza rispetto all'applicazione simultanea delle operazioni di coniugazione di carica (C) e parità (P) di cui si discuterà nella prima parte di questa trattazione. L'unico sistema fisico in cui è stata finora effettivamente osservata la violazione di CP è quello costituito dai mesoni K<sup>0</sup> e <a href="https://www.codecogs.com/eqnedit.php?latex=\bar{K}^{0}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\bar{K}^{0}" title="\bar{K}^{0}" /></a>. Il parametro <a href="https://www.codecogs.com/eqnedit.php?latex=\varepsilon" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\varepsilon" title="\varepsilon" /></a> che misura la violazione di CP dovuta al mixing K<sup>0</sup>-<a href="https://www.codecogs.com/eqnedit.php?latex=\bar{K}^{0}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\bar{K}^{0}" title="\bar{K}^{0}" /></a> e dell'ordine di 10<sup>-3</sup>, mentre la violazione 'diretta' (cioè relativa all'ampiezza di decadimento K --> ππ) e misurata da un parametro <a href="https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\varepsilon&space;'" title="\varepsilon '" /></a> molto più piccolo. Infatti <a href="https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'/\varepsilon&space;\sim&space;10^{-3}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\varepsilon&space;'/\varepsilon&space;\sim&space;10^{-3}" title="\varepsilon '/\varepsilon \sim 10^{-3}" /></a>. I risultati sperimentali attuali su questo rapporto non sono conclusivi e per ottenere <a href="https://www.codecogs.com/eqnedit.php?latex=\Delta&space;\left&space;(&space;\varepsilon&space;'/\varepsilon&space;\right&space;)\sim&space;10^{-4}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\Delta&space;\left&space;(&space;\varepsilon&space;'/\varepsilon&space;\right&space;)\sim&space;10^{-4}" title="\Delta \left ( \varepsilon '/\varepsilon \right )\sim 10^{-4}" /></a> si sono progettati molti esperimenti a targhetta fissa (CERN,FNAL), mentre presso i Laboratori Nazionali di Frascati (LNF) dell'I.N.F.N. è stata recentemente decisa la realizzazione di una misura di <a href="https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'/\varepsilon" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\varepsilon&space;'/\varepsilon" title="\varepsilon '/\varepsilon" /></a> utilizzando un anello di accumulazione e<sup>+</sup>e<sup>-</sup>. Il progetto DA<a href="https://www.codecogs.com/eqnedit.php?latex=\Phi" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\Phi" title="\Phi" /></a>NE prevede la costruzione di una '<a href="https://www.codecogs.com/eqnedit.php?latex=\phi" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\phi" title="\phi" /></a>-factory' che presumibilmente sarà operativa nel 1995. Questa macchina, attraverso la reazione <a href="https://www.codecogs.com/eqnedit.php?latex=\phi&space;\rightarrow&space;K^{0}\bar{K}^{0}\rightarrow&space;\pi&space;^{+}\pi&space;^{-}\pi&space;^{0}\pi&space;^{0}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\phi&space;\rightarrow&space;K^{0}\bar{K}^{0}\rightarrow&space;\pi&space;^{+}\pi&space;^{-}\pi&space;^{0}\pi&space;^{0}" title="\phi \rightarrow K^{0}\bar{K}^{0}\rightarrow \pi ^{+}\pi ^{-}\pi ^{0}\pi ^{0}" /></a>, permetterà una misura molto accurata dei parametri <a href="https://www.codecogs.com/eqnedit.php?latex=\varepsilon" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\varepsilon" title="\varepsilon" /></a> e <a href="https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\varepsilon&space;'" title="\varepsilon '" /></a> che caratterizzano la violazione di CP nel sistema dei mesoni K neutri. Infatti, come spiegato nei seguenti capitoli, si studierà la cosiddetta 'double ratio' e cioè il rapporto tra il numero di decadimenti <a href="https://www.codecogs.com/eqnedit.php?latex=K_{L}^{0}\rightarrow&space;\pi&space;^{0}\pi&space;^{0}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?K_{L}^{0}\rightarrow&space;\pi&space;^{0}\pi&space;^{0}" title="K_{L}^{0}\rightarrow \pi ^{0}\pi ^{0}" /></a> fratto il numero di decadimenti <a href="https://www.codecogs.com/eqnedit.php?latex=K_{S}^{0}\rightarrow&space;\pi&space;^{0}\pi&space;^{0}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?K_{S}^{0}\rightarrow&space;\pi&space;^{0}\pi&space;^{0}" title="K_{S}^{0}\rightarrow \pi ^{0}\pi ^{0}" /></a> e la corrispondente quantità per i decadimenti dei K in π<sup>+</sup>π<sup>-</sup>. |
| 509 | 1992-11-04 | NON-LEPTONIC K Æ 3p DECAYS | 1992 | LNF-92-081(P).pdf | L. MAIANI, N. PAVER | |
| 510 | 1992-11-04 | CAN ONE TEST QUANTUM MECHANICS AT THE F-FACTORY? | 1992 | LNF-92-082(P).pdf | G. GHIRARDI, R. GRASSI, R. RAGAZZON | The problem of the possibility of testing Bell's type inequalities in \\Phi\\rightarrow K-\\overline{K} is discussed. A comparison with EPR-Bohm type experiments for the singlet state and with Aspect's experiments with optical photons is made. We show that, due to the specific features of the two mesons system, no violation of Bell's type inequalities is implied by quantum mechanics. Finally, the deviations from quantum predictions which are implied by the assumption of 'spontaneous factorization' are analyzed. |
| 511 | 1992-11-04 | HADRONIC FORM FACTORS | 1992 | LNF-92-083(P).pdf | A. BRAMON | |
| 512 | 1992-11-04 | TWO PHOTON CONTRIBUTION TO THE PROCESS e+e- Æ e+e-pp | 1992 | LNF-92-084(P).pdf | A. COURAU, G. PANCHERI | |
| 513 | 1992-11-04 | PREDICTIONS FOR gg Æ pp: WHAT PHOTONS AT DAFNE WILL SEE | 1992 | LNF-92-085(P).pdf | M. R. PENNINGTON | The aim of this article is threefold. Firstly, to discuss briefly why two photon interactions are interesting and then to review what is presently known about them experimentally. Thirdly, to consider how we may predict what DAPHNE may measure. The channel of particular concern is \\gamma\\gamma\\rightarrow\\pi^0\\pi^0. The cross-section for this process can be readly calculated in chiral perturbation theory, but the lowest order prediction is not in good agreement with existing data. However, general principles relate this process in other reactions with \\pi\\pi final states that allow a more general calculational scheme. This predicts cross-sections in much better accord with experiment. The reasons why are analyzed in detail. Moreover, we are then able to show how precision measurements of the \\gamma\\gamma\\rightarrow\\pi\\pi cross-section, both for \\pi+\\pi- and \\pi^0\\pi^0, would in turn constrain our knoledge of \\pi\\pi phases. |
| 514 | 1992-11-04 | SCALAR MESONS AND KAONS IN f-RADIATIVE DECAY & THEIR IMPLICATIONS FOR STUDIES OF CP VIOLATION AT DAFNE | 1992 | LNF-92-086(P).pdf | N. BROWN, F. E. CLOSE | Tragically, Nick Brown died in an accident on 13 June 1991 just as his great potential as a physicist was beginning to flower. He was enthusiastically committed to science and this was his last and uncompleted research. He had written up rather complete notes which I include here as section 1 in his own words with only minor editing by me* and hope that he would have approved of it and the subsequent commentary. We had become interested in the possibility that radiative decays of the \\phi meson might be so prominent they would undermine the primary aim of the \\phi factory, namely the study of CP violation. As a result of Nick's work we can now be confident that the CP programme will not be significantly affected by this possibility. At the same time, the DAPHNE facility will create opportunities for studying \\phi radiative processes, in particular the production of the enigmatic scalar resonances, in their own right. Our joint understanding of this was primitive at the time of Nick's death and we did not perceive the subtleties and insight that this, still incompleted, work would bring. My personal sadness is that Nick was not able to witness the discoveries that came from all this; he certainly would have enjoyed them and I would like to dedicate this paper to his memory. |
| 515 | 1992-11-04 | PSEUDOSCALAR MESONS AT DAFNE | 1992 | LNF-92-087(P).pdf | F. E. CLOSE | |
| 516 | 1992-11-04 | ELECTROMAGNETIC DECAYS OF VECTOR MESONS IN LATTICE QCD | 1992 | LNF-92-088(P).pdf | M. CRISAFULLI, V. LUBICZ | We present a lattice study of electromagnetic decays of vector mesons V into pseudoscalar mesons P, relevant to radiative decays V\\rightarrowP\\gamma and conversion decays V\\rightarrowPl+l-. The form factor f_q(q^2), associated with the electromagnetic current of the quark q, has been computed using Wilson fermions in the quenched approximation. |
| 517 | 1992-11-04 | EXPERIMENTAL STUDIES OF THE RADIATIVE DECAYS OF VECTOR MESONS | 1992 | LNF-92-089(P).pdf | S. I. EIDELMAN | |
| 518 | 1992-11-04 | STUDYING THE f0 AND h’ AT DAFNE | 1992 | LNF-92-090(P).pdf | J. LEE - FRANZINI, W. KIM, P. J. FRANZINI | At the end of 1995, the Frascati \\phi-factory will begin delivering of the order of 500\\phi-meson/sec. This provides a unique opportunity to study the f0(975) in \\phi radiative decays, even for branching ratios which in some estimates could be as low as 1X10^-6. This unique, lightest scalar meson state is poorly described by current models, and more information is essential. By Monte Carlo studies we show that the smallest expected branching ratio can easily be measured in the decay f0\\rightarrow\\pi^0\\pi^0. In decays to \\pi+\\pi-, there are backgrounds from continuum processes. Interference between one of these processes and the f0 amplitude leads to very interesting and complex patterns. A complete study of the photon spectrum from e+e-\\rightarrow\\pi+\\pi-\\gamma at the \\phi peak, after suppression of continuum contributions by suitable kinematics and angular cuts, can determine the sign of the \\phi f0\\gamma coupling even for the smallest branching ratio, thus providing a totally new piece of information for the investigation of the nature of the f0. A similar study of the decay \\phi\\rightarrow\\eta'\\gamma shows that its branching ratio can be measured with very good accuracy, therefore measuring the gluon contents of light pseudoscalar mesons to high accuracy. |
| 519 | 1992-11-04 | Vector Meson Spectroscopy Above the F at DAFNE | 1992 | LNF-92-091(P).pdf | R. BALDINI, D. BISELLO, A. CALCATERRA, A. CASTRO | The production of 1-- states with mass above the \\phi, up to 2 GeV, is shortly reviewed. The importance of having a high luminosity e+e- collider covering this mass range is enphasized. |
| 520 | 1992-11-04 | Radial 1-- Excitations at DAFNE | 1992 | LNF-92-092(P).pdf | D. C. Peaslee | |
| 521 | 1992-11-04 | On Possible Four-Quark Meson States in the Mass Region near 1.5 GeV | 1992 | LNF-92-093(P).pdf | P. E. Volkovitsky | The four-quark interpretation of recently discovered f_2/AX resonance in string model as a D-wave state of two scalar diquarks fixes the parameters of this model and leads to the prediction of masses of all other 4q-states. Here I discuss briefly the spectrum of these states, in particular of the possible low-lying 1-- 4q-resonances, which could be produced in e+e- collisions at DAPHNE. |
| 522 | 1992-11-04 | Some Problems of Meson Spectroscopy. Possible Solutions at DAFNE | 1992 | LNF-92-094(P).pdf | P. E. Volkovitsky | The e+e- collider with luminosity of the order of 10^32 - 10^33 cm^-2s-1 in the energy range \\sqrt{s} = 1-2 GeV is a very good facility to study hadron physics. We discuss here some problems of meson specroscopy, namely the problem of radial and orbital vector meson excitations and their electromagnetic widths, the two particle decays of vector mesons and the level structure of P-wave meson multiplets. In the first two cases one can study the vector mesons produced in s-channel. In the last case the study of radiative decays of \\rho(1700) meson into P-wave states gives a possibility to discriminate between different candidates for P-wave multiplet members. |
| 523 | 1992-11-04 | Hypernuclear Physics | 1992 | LNF-92-095(P).pdf | T. Bressani | |
| 524 | 1992-11-04 | Hadronic Contributions to the Muon g-2 | 1992 | LNF-92-096(P).pdf | R. Barbieri, E. Remiddi | |
| 508 | 1992-10-27 | N=3 SUPERSYMMETRIC EXTENSION OF KdV EQUATION | 1992 | LNF-92-080(P).pdf | S. BELLUCCI, E. IVANOV, S. KRIVONOS | We construct a one-parameter family of N = 3 supersymmetric and SO(3) symmetric extensions of the KdV equation as a Hamiltonian flow on N = 3 superconformal algebra and argue that iit is non-integrable for any choice of the parameter. Then we propose a modified N = 3 super KdV equation which possesses the higher order conserved quantities and so is a candidate for an integrable system. Upon reduction to N = 2, it yelds the rcently discussed 'would-be integrable' version of the N = 2 super KdV equation. In the bosonic core it contains a coupled system of the KdV type equation and a three-component generalization of the mKdV equation. We give a Hamiltonian formulation of the new N = 3 super KdV equation as a flow on some contraction of the direct sum of two N = 3 superconformal algebras. |
| 507 | 1992-10-26 | PARROT: A FIBER OPTIC LINK FOR PARTICLE DETECTORS | 1992 | LNF-92-079(P).pdf | M. LEONE, L. TRASATTI, G. STEFANI, L. AVALDI | the fiber optic technology has been used to build a transmitter - receive system capable of delivering channeltron or PM tube signals through a few hundred metre span. The intrinsic immunity of optical fibers to e.m. noise has been used to reduce noise problems in an experimental apparatus equipped with two electrostatic analyzers for coincidence (e, 2e) spectroscopy. A coincidence energy separation spectrum of He, used for calibration of the apparatus energy scale, has been measured using fiber optic links instead of coaxial cables. The system was completely built using cheap and easily available commercial components. The results show that fiber optic links could become a viable technique for noise reduction, high voltage decoupling and low temperature calorimeters signal transfer. |
| 3878 | 1992-10-20 | Bilinearization of Multidimensional Topological Magnets | 1992 | INFN-FM_92-4.pdf | L. Martina O.K. Pashaev G. Soliani | |
| 505 | 1992-10-13 | MEASUREMENT OF THE TOTAL CROSS SECTION FOR 238U PHOTOFISSION IN THE NUCLEON RESONANCE REGION | 1992 | LNF-92-077(P).pdf | N. BIANCHI, A. DEPPMAN, E. DE SANCTIS, A. FANTONI, P. LEVI - SANDRI, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, P. ROSSI, M. ANGHINOLFI, P. CORVISIERO, G. GERVINO, L. MAZZASCHI, V. MOKEEV, G. RICCO, M. RIPANI, M . SANZONE, M. TAIUTI, A. ZUCCHIATTI, R. BERGERE, P. CARLOS, P. GARGANNE, A. LEPRETRE | We present the results of the photofission cross section for 238U measured between 200 and 1200 MeV. In the \\Delta region our results agree with existing data on total photoabsorption cross section, while at higher energy they show no evidence of the higher nucleon resonances, clearly seen in the photon absorption on proton, and a damping of the absolute value. |
| 3902 | 1992-10-07 | Solemi–1, a 8 Tesla, 535 mm Room Temperature Bore, Superconducting Solenoid – Part 2: Cryogenic, Vacuum data Acquisition annnd Control System | 1992 | INFN-TC_92-24.pdf | G. Baccaglini G. Cartegni M. Fusetti L. Gini L. Grilli A. Leone D. Pedrini L. Rossi M. Todero G. Volpini | |
| 3903 | 1992-10-07 | Costruzione di Solenoidi Superconduttori con Campo di 10 Tesla, presso il Laboratorio L.A.S.A., per Studi di Transizione dallo Stato Superconduttivo a quello Resistivo | 1992 | INFN-TC_92-25.pdf | G. Baccaglini M. Canali G.C. Cartegni C. Fumagalli M. Fusetti L. Gini A. Leone | |
| 3901 | 1992-10-01 | Solemi–1, a 8 Tesla, 535 mm Room Temperature Bore, Superconducting Solenoid – Part 1: Design and Constructing | 1992 | INFN-TC_92-23.pdf | E. Acerbi R. Marabotto E. Perrella L. Rossi | |
| 504 | 1992-09-29 | UNOCCUPIED ELECTRON STATES OF Ni, Mo, AND MoNi3 ALLOY | 1992 | LNF-92-076.pdf | M. T. CZYZYK, K. LAWNICZAK - JABLONSKA, S. MOBILIO | We report on a systematic study of the unoccupied electronic states of long-range-ordered orthorombic MoNi3 alloy as well as its parent metals as reference. Measurements included the bremsstrahlung isochromat spectra for incoming-electron kinetic energy of 5414 eV and K-edge x-ray-absorption spectra of Ni. Further, all measured spectra were calculated on the basis of ab initio band-structure calculations performed for the investigated materials. The influence of the core hole on the Ni K-edge absorption spectrum was found to be small. A substantial deviation of the local structure in the long-range-ordered alloy was inferred by analogy to a local deformation of the lattice in semiconducting pseudobinary (ternary) alloys. |
| 503 | 1992-09-28 | WHY IS GENERALLY ACCEPTED QCD WRONG? TOWARDS THE TRUE QCD | 1992 | LNF-92-075(P).pdf | G. PREPARATA | We discuss the flaws of GAQCD, in the light of the essential instability of the QCD perturbative ground state. A new, very promising strategy to solve QCD is presented, that arises from an understanding of the causes of the instability of the perturbative vacuum. |
| 502 | 1992-09-25 | TOWARDS AN INTEGRABLE N=3 SUPER KdV EQUATION | 1992 | LNF-92-074(P).pdf | S. BELLUCCI, E. IVANOV, S. KRIVONOS | Starting with a most general N = 3 superfield extension of KdV equation and requiring the existence of both a higher order conservation law for it and a proper reduction to N = 2 super KdV equation we deduce a new N = 3 super KdV equation which is a unique candidate for being integrable. Upon reduction to the N = 2 case it yields the recently discussed 'would-be' integrable version of N = 2 super KdV equation. It can be interpreted as a Hamiltonian flow of some contraction of the direct sum of two N = 3 superconformal algebras. |
| 3863 | 1992-09-17 | Free Maxwell Equations, Dirac Equation, and Non–Dispersive de Broglie Wave–Packets | 1992 | INFN-AE_92-25.pdf | W.A.Rodrigues Jr. J. Vaz Jr. E. Recami | |
| 501 | 1992-09-16 | f Æ p+p-g AT F-FACTORIES | 1992 | LNF-92-073.pdf | A. BRAMON, G. COLANGELO, M. GRECO | The possible detection of the reaction \\Phi\\rightarrow f_0(975)\\gamma\\rightarrow\\pi\\+\\pi-\\gamma at Daphne is discussed together with the initial and final state back-ground radiation. The size of the effect is shown t depend crucially on the relative sign of the e+e-\\rightarrow\\rho\\rightarrow\\pi+\\pi-\\gamma and e+e-\\rightarrow\\phi\\rightarrow f_0\\gamma \\rightarrow\\pi+\\pi-\\gamma amplitudes. Some numerical results are also given. |
| 500 | 1992-09-15 | ON THE FINITENESS OF THE INVERSE DIFFRACTION TRANSFORM KERNEL | 1992 | LNF-92-072(P).pdf | E. ETIM, L. MAGRO, M. PALLOTTA | The diffraction transform solves both the direct and the inverse scattering problem for the Helmholtz equation. Its kernel is itself an integral. It is the representation of the evolution operator assosiated with translations of a constrained Cartesian coordinate. The corresponding momentum operator is, consequently, non-Hermitian. This fact threatens the inverse scattering problem with a divergence if the transform kernel is understood as a Cauchy integral. The kernel is, however, everywhere convergent if its integral representation is interpreted as a Cesaro summable integral. Taking a Bjorken type limit of the Cesaro representation leads to the summability of the divergent kernel with respect to a spectral measure. This accords well with the general solution of the scattering problem in which such spectral functions are admissible. The use of variously motivated cut-offs and other ad hoc filters to enforce convergence is therefore highly contrived. |
| 506 | 1992-09-15 | EXSTENDED X-RAY-ABSORPTION FINE-STRUCTURE INVESTIGATION OF SHORT-RANGE ORDER IN a-Ge1-x Snx ALLOYS | 1992 | LNF-92-078.pdf | S. PASCARELLI, F. BOSCHERINI, S. MOBILIO, A. R. ZANATTA, F. C. MARQUES, I. CHAMBOULEYRON | The local environments of germanium and tin atoms in a-Ge_1-xSn_x alloys (0.0\\leq x \\leq 0.2) have been investigated by measuring the extended x-ray-absorption fine structure (EXAFS) at the Ge K edge and at the Sn L_iii edge. The measured EXAFS at both edges could be described only by assuming the presence of a mixed first coordination shell composed of both Ge and Sn atoms. Coordination numbers, bond lenghts, and relative mean-square displacement values characterizing the first coordination shell around Ge and Sn atoms were obtained. It has been found that the Sn atoms are randomly distributed in the amorphous Ge network, and that metallic Sn segregation may be excluded troughout the concentration range studies. The Ge-Ge, Ge-Sn, and Sn-Sn distances were found to be independent of concentration and equal to 2.47, 2.67, and 2.80A, respectively. The random atomic arrangement observed is an indication that, in this concentration range and under the growth conditions adopted, the incorporation of Sn in the amorphous Ge matrix is dominated by chemical interactions, regardless of the atomic-size difference between the two atoms. |
| 499 | 1992-09-11 | VECTOR-MESON RESONANCES AND PION POLARIZABILITIES | 1992 | LNF-92-071(P).pdf | D. BABUSCI, S. BELLUCCI, G. GIORDANO, G. MATONE | We discuss the pion polarizabilities \\alpha_\\pi, \\beta_\\alpha using a vector dominance model. We find that the commonly used constraint (\\alpha + \\beta)_\\pi = 0 is not admissible for the \\pi^0. We show that the vector-meson contribution accounts for almost 70% of the \\pi^0 forward angle dispersion sum rule. |
| 5700 | 1992-09-07 | A FEASIBILITY STUDY OF THE MEASUREMENT OF <a href='https://www.codecogs.com/eqnedit.php?latex=B^{0}-\\bar{B}^{0}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?B^{0}-\\bar{B}^{0}' title='B^{0}-\\bar{B}^{0}' /></a> MIXING BY USING A <a href='https://www.codecogs.com/eqnedit.php?latex=\\Lambda&space;^{0}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\\Lambda&space;^{0}' title='\\Lambda ^{0}' /></a>'s AND LEPTONS TO TAG THE b-DECAY. | 1992 | INFN-AE-92-23.pdf | M. Caccia, N. Demaria, E. Gross, Ch. Petridou, M. Prest. | A tagging of b-quarks is pursued using <a href='https://www.codecogs.com/eqnedit.php?latex=\Lambda&space;^{0}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Lambda&space;^{0}' title='\Lambda ^{0}' /></a> and leptons in opposite jets, requiring one b-quark to decay semileptonically and the other to a final state containing a <a href='https://www.codecogs.com/eqnedit.php?latex=\Lambda&space;^{0}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Lambda&space;^{0}' title='\Lambda ^{0}' /></a>. A purity in b<span style='text-decoration: overline'>b</span> of about 60% is achieved at the Monte Carlo level by retaining about 40% of the signal. Furthermore an attempt was made to use this type of b-tagging in order to measure <a href='https://www.codecogs.com/eqnedit.php?latex=B^{0}-\bar{B}^{0}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?B^{0}-\bar{B}^{0}' title='B^{0}-\bar{B}^{0}' /></a> mixing. The results look rather encouraging. |
| 5701 | 1992-09-07 | A SILICON CALORIMETER FOR COSMIC ANTIMATTER SEARCH. | 1992 | INFN-AE-92-24.pdf | G. Barbiellini, G. Basini, V. Bidoli, M. Bocciolini, M. Boezio, F. Bongiorno, F. Massimo Brancaccio, M.T. Brunetti, A. Buccheri, M. Candusso, M. Casolino, F. Celletti, A. Codino, C. De Fabritiis, M.P. De Pascale, F. Fratnik, M. Grandi, A. Incicchitti, M. Menichelli, M. Miozza, A. Morselli, A. Perego, P. Picozza, D. Prosperi, M. Ricci, I. Salvadori, P. Schiavon, P. Spillantini, A. Vacchi, N. Zampa. | The silicon sampling calorimeter presented is conceived as a fine grained imaging device to carry out studies of the anti-matter component in the primary cosmic radiation; it will be used in balloon payload program starting in 1993. The first sampling layer (48x48 cm<sup>2</sup>) of this silicon calorimeter has been completed and successfully tested. We report the first results form studies performed at the CERN PS t<sub>7</sub> beam. The complete calorimeter contains 20 xy sampling layers (strip pitch 3.6 mm) interleaved with 19 showering material planes (tungsten 0.5 X<sub>O</sub>). This allows to picture the Transverse distributions of the shower in both coordinates at each sampling. The outstanding imaging capabilities reflects in high particle identification power. Preliminary results from beam lests performed with antiprotons at 3.5 GeV on a tower prototype of the calorimeter are reported. |
| 3862 | 1992-09-07 | Silicon Calorimeter for Cosmic Antimatter Search | 1992 | INFN-AE_92-24.pdf | A. Vacchi et al. | |
| 496 | 1992-09-04 | PROGRESS REPORT of THE MACHINE CONSTRUCTION AND FEL PROGRAM ON LISA AT LNF | 1992 | LNF-92-068.pdf | M. CASTELLANO, P. PATTERI, F. TAZZIOLI, J. ZHUANG, N. CAVALLO, F. CEVENINI, F. CIOCCI, G. DATTOLI, A. DI PACE, G. P. GALLERANO, A. RENIERI, E. SABIA, A. TORRE, L. CATANI | We report the construction progress of the superconducting (SC) linac LISA and of the FEL experiment SURF at LNF. The design criteria of the 25 MeV transport line from the linac to the undulator are presented and the operating and emittance measurements of the 100 keV gun are described. |
| 497 | 1992-09-04 | MEASUREMENT OF THE ELECTROMAGNETIC AND TeV MUON COMPONENTS OF EXTENSIVE AIR SHOWERS BY EAS-TOP AND MACRO EXPERIMENTS | 1992 | LNF-92-069.pdf | MACRO Collaboration | The simultaneous observation of the electromagnetic and TeV muon components of extensive air showers by the EAS-TOP and MACRO detectors, respectively, is described for a period of 100 days in 1990. The two detectors and their combined resolutions are briefly reviewed and muon multiplicity distributions for various detector configurations are presented. A first analisys of the physical parameters N\\mu and N_e related to the study of the primary composition at E_o = 10^14 - 10^16 eV is also presented. |
| 498 | 1992-09-04 | ORIENTAMENTO PIATTAFORMA NAUTILUS | 1992 | LNF-92-070(NT).pdf | A. MARINI, M. TROIANI | L'antenna gravitazionale criogenica Nautilus, istallata presso i LNF, e' montata su una piattaforma rotante, al fine di permettere un orientamento azimutale variabile. Nel seguito vengono descritte la definizione di una retta di riferimento sulla piattaforma e la misura dell'orientazione di tale retta rispetto al Nord. |
| 492 | 1992-09-03 | SYMMETRY TEST WITH K, h AND f DECAYS | 1992 | LNF-92-064(P).pdf | V. S. DEMIDOV E. SHABALIN | A possibility of test of CPT and T-invariance in K-decays and testing C invariance in \\eta and \\phi decays at the \\Phi-factory in Frascati is considered. The most interesting and feasible experiments are discussed. Our consideration does not include a study of CP violation at a \\Phi-factory. This main aim of a \\Phi-factory is considered in details in other papers. |
| 493 | 1992-09-03 | PROGETTO DI UN CONTATORE A SCINTILLA MODULARE CON ELETTRODI IN VETRO | 1992 | LNF-92-065(IR).pdf | G. BENCIVENNI, G. FELICI, C. GUSTAVINO, E. IACUESSA | Lo studio di contatori a scintilla in vetro (GSC) e' iniziato a Frascati nel 1991 [1.2], con la costruzione di prototipi di dimensioni ridotte, realizzati utilizzando elettrodi in vetro commerciale di tipo float. Il principale vantaggio di questo rivelatore rispetto agli RPC in bakelite [3] e' l'assenza di scintille non associate al passaggio di particelle, consentendo la calibrazione e il controllo dei rivelatori in modo rapido, attraverso la misura della frequenza di conteggio in singola. Questa caratteristica e' di estrema importanza in apparati di grande dimensione. I risultati ottenuti hanno evidenziato che questo rivelatore puo' essere utilizzato in esperimenti in cui viene effettuato lo studio degli sciami atmosferici estesi. La resistivita' degli elettrodi in vetro float (circa 10^12 \\Omega.cm), e' infatti adeguata per le applicazioni a basse frequenze di conteggio. La risoluzione temporale di circa un nanosecondo consente la determinazione dell'asse degli sciami con una risoluzione angolare di circa un grado, utilizzando la tecnica dei tempi di volo. Infine, la notevole ampiezza dei segnali associati alle scintille (alcune centinaia di millivolt) consente di utilizzare un elettronica di front-end a basso costo. Poiche' gli apparati di rivelazione atmosferici estesi hanno in genere un notevole sviluppo superficiale [4], e' di estrema importanza che i rivelatori siano concepiti in modo da poter essere realizzati con procedure industriali, in modo da garantire una elevata velocita' di produzione e un costo contenuto. In questa nota viene riportato il disegno di un GSC ad elevata modularita' e di facile assemblaggio, adatto quindi alla produzione in serie. Le soluzioni adottate rendono il rivelatore poco sensibile alle condizioni di lavoro. |
| 494 | 1992-09-03 | RADIATIVE NON-LEPTONIC KAON DECAYS | 1992 | LNF-92-066(P).pdf | G. D'AMBROSIO, M. MIRAGLIUOLO, P. SANTORELLI | |
| 495 | 1992-09-03 | LOW-ENERGY KAON INTERACTIONS AND SCATTERING ON NUCLEOS AND LIGHT NUCLEI | 1992 | LNF-92-067(P).pdf | P. M. GENSINI | We present in this contribution the basic formulae for the analisys of low-momentum charged-and neutral-kaon interactions in hydrogen, including as well a (brief) description of the problems left open by past experiments and of the improvements DAPHNE can be expected to offer over them. Interactions in deuterium and other light nuclei will be only briefly mentioned, and only in those respects touching directly upon the more 'elementary' aspects of kaon-nucleon interactions. |
| 3874 | 1992-08-27 | Radiative Transitions in Muonic Htdrogen | 1992 | INFN-BE_92-6.pdf | E. Milotti | |
| 3877 | 1992-08-26 | Shortening of Free–Running XeCl Laser Pulses by Stimulated Brillouin Scattering | 1992 | INFN-FM_92-3.pdf | A.A. Filippo M.R. Perrone | |
| 3900 | 1992-08-24 | Correlations in the Field Errors of Superconducting Magnets for Particle Accelerators | 1992 | INFN-TC_92-22.pdf | F. Galluccio | |
| 3898 | 1992-07-24 | Automazione delle Procedure Contabili al CNAF | 1992 | INFN-TC_92-20.pdf | L. Fonti F. Morelli | |
| 3860 | 1992-07-24 | The Design of the L3 Silicon Microvertex Detector | 1992 | INFN-AE_92-21.pdf | B. Alpat G. D'Ambrosi ........ M. Caria et. al | |
| 3899 | 1992-07-24 | Computer Applications in Electron Beam Radiotherapy Treatment Planning | 1992 | INFN-TC_92-21.pdf | G. Gervino E. Monticone E. Alfieri | |
| 3861 | 1992-07-24 | A Generalization of Dirach Non–Linear Electrodynamics, and Spinning Charged Particles | 1992 | INFN-AE_92-22.pdf | W.A.Rodrigues Jr. J. Vaz Jr. E. Recami | |
| 3897 | 1992-07-22 | Introduzione all'uso di DECwindow sul Cluster VAXTS | 1992 | INFN-TC_92-19.pdf | A. Mansutti C. Strizzolo A. Tirel | |
| 3871 | 1992-07-22 | Measurement of the Hyperfine Splitting of Muonic Hydrogen (m–p)1s An Experimental Method | 1992 | INFN-BE_92-3.pdf | D. Bakalov E. Milotti C. Rizzo A. Vacchi E. Zavattini | |
| 3872 | 1992-07-22 | Laser Spectroscopy of Muonic Hydrogen | 1992 | INFN-BE_92-4.pdf | D. Chatellard F. Ciocci ....... E. Zavattini | |
| 3873 | 1992-07-22 | Detction of 187Re Beta Decay with a Cryogenic Microcalorimeter: Preliminary Results | 1992 | INFN-BE_92-5.pdf | E. Cosulich G. Gallinaro F. Gatti S. Vitale | |
| 5699 | 1992-07-18 | THE 'HIDE-AND-SEEK' OF THE Z'. | 1992 | INFN-AE-92-20.pdf | Anna Chiappinelli. | We discuss about the possibilities of decoupling the Standard Model dynamic from the effects due to extra gauge symmetries. We generalize the Georgi-Weinberg hypotesis allowing a standard <i>Z</i> coupling in <i>q</i><sup>2</sup> = 0 interactions and show that, analogous conditions on the higgses may cause, at <i>q</i><sup>2</sup> = <a href='https://www.codecogs.com/eqnedit.php?latex=M_{Z}^{2}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?M_{Z}^{2}' title='M_{Z}^{2}' /></a>, the decoupling between the virtual currents. E<sub>6</sub> derived canonical models can fit the requested Higgses decoupling condition and reproduce, both at <i>q</i><sup>2</sup> = 0 and at <i>q</i><sup>2</sup> = <a href='https://www.codecogs.com/eqnedit.php?latex=M_{Z}^{2}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?M_{Z}^{2}' title='M_{Z}^{2}' /></a>, standard couplings for the <i>Z</i> vector boson and the photon; this Higgs representation can justify an eventually large difference of mass between the <i>Z</i> and the <i>Z'</i>. |
| 491 | 1992-07-17 | A BGO SPECTROMETER FOR 200-1500 MeV PHOTON | 1992 | LNF-92-063.pdf | M. ANGHINOLFI, M. CASTOLDI, P. CORVISIERO, G. GERVINO, L. MAZZASCHI, V. MOKEEV, G. RICCO, M. RIPANI, M. SANZONE, M. TAIUTI, A. ZUCCHIATTI, N. BIANCHI, E. DE SANCTIS, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, P. ROSSI | A BGO spectrometer used at Frascati both as a monitor for a tagged-photon beam and as a photon spectrometer in a total photonuclear absorption experiment is described. Measured characteristics of the detector (response function, energy resolution, and tagged-bremsstrahlung spectra of energy up to 1.5 GeV) are shown, and compared to a Monte Carlo simulation. |
| 490 | 1992-07-16 | ON THE MEASUREMENT OF gg Æ p0p0 AT DAFNE | 1992 | LNF-92-062(P).pdf | F. ANULLI, D. BABUSCI, R. BALDINI - FERROLI, M. BASSETTI, S. BELLUCCI, G. GIORDANO, G. MATONE, G. PANCHERI, A. ZALLO | The experimental requests for the measurement of the process \\gamma\\gamma\\rightarrow\\pi^0\\pi^0 at DAPHNE energies using the KLOE detector have been examined. Preliminary calculations on the possibilities to equip this detector with a tagging for forward emitted leptons are also given. |
| 3896 | 1992-07-16 | Syrmep (SYnchrotron Radiation for MEdical Physics). Performance of the digital detection system | 1992 | INFN-TC_92-18.pdf | G. Cantatore et. al | |
| 5698 | 1992-07-16 | QUANTUM DEFORMATION OF THE LADDER REPRESENTATIONS OF U(1,1) FOR |q| = 1. | 1992 | INFN-AE-92-19.pdf | P. Furlan, L.K. Hadjiivanov, I.T. Todorov | We construct U<sub>q</sub>(u(1,1)) covariant creation and annihilation operators for q on the unit circle and consider the corresponding ladder and singleton representations. PACS classification: 11.30.Ly |
| 489 | 1992-06-30 | VECTOR MESON AND CHIRAL LOOP CONTRIBUTIONS TO THE DECAYS V0Æ P0P0g | 1992 | LNF-92-061(P).pdf | A. BRAMON, A. GRAU, G. PANCHERI | The contribution of intermediate vector mesons to the decays V^0\\rightarrow P^0P^0\\gamma is calculated and compared with previous estimates and approximate evaluations. For some decays, like\\phi or \\omega\\\\rightarrow\\pi^0\\pi^0\\gamma our results update the existing numbers. For the decays \\phi\\rightarrow K^0\\overline{K^0}\\gamma and \\phi,\\omega\\rightarrow\\phi^0\\eta\\gamma, we find values different from the ones in the literature and discuss the origin of the discrepancy. Discrepancies with approximate evaluations from product of branching ratios of vector meson decay chains are also discussed in detail. In an attempt to extend Chiral Perturbation Theory to this radiative decays the contributions of (chiral) loops are calculated and found to be important. Relation to be VMD contributions and global results are presented. |
| 488 | 1992-06-25 | LE RADIAZIONI IONIZZANTI IONIZING RADIATION | 1992 | LNF-92-060(NT).pdf | SERVIZIO FISICA SANITARIA | Article 61, Section d) of the DPR 185/64(*) obligates employers and management to:'inform employees of the specific risks to which they are exposed...' Article 64 sets forth that employees must: a. in addition to the rules of this chapter, observe the rules regerding individual and collective safety given by the employer or by person in charge, relating to their jobs; b. use the safety devices, protective equipment and dosimeters provided by the employer carefully and correctly; c. immediately alert the employer, manager or person in charge of any defect in the safety devices, and safety equipment of the dosimeters, as well as of any dangerous circumstances of which they become aware; d. not remove or modify, without prior autorization, the devices or other protective, signaling, safety or measuring means; e. not do anything, on their own initiative, outside their own competence that can affect general safety. This pamphlet has been written both to satisfy the obbligations set forth in article 61 d) and to make the employees aware of the importance of complying with their obligations as per article 64. This pamphlet is therefore intended for all workers at the Frascati National Laboratories (employees and visitors alike) and is written in the clearest possible language even though the use of technical terms is inevitable. (*) Decree 185 by the President of the Rebublic, February 13, 1964 published in the ordinary Supplement to the 'Gazzetta Ufficiale' N. 95 April 16, 1964 (Plant safety and health protection for workers and the general population against the danger of ionizing radiation due to peaceful uses of nuclear energy). L'art.61 comma d) del D.P.R. n.185/64(*) fa obbligo ai datori di lavoro, ai dirigenti e ai preposti di: 'rendere edotti i lavoratori dei rischi specifici cui sono esposti...'. L'art.64 stabilisce che i lavoratori devono: a. osservare, oltre le norme del presente Capo, le disposizioni impartite dal datore di lavoro, o dai suoi incaricati, ai fini della protezione individuale e collettiva e della sicurezza, a seconda delle mansioni alle quali sono addetti; b. usare, con cura ed in modo corretto, i dispositivi di sicurezza, i mezzi di protezione e di sorveglianza dosimetrica predisposti o forniti dal datore di lavoro; c. segnalare immediatamente al datore di lavoro, al dirigente o al preposto le deficienze dei dispositivi e dei mezzi di sicurezza, di protezione e di sorveglianza dosimetrica, nonche' le altre eventuali condizioni di pericolo di cui vengano a conoscenza; d. non rimuovere ne' modificare, senza averne ottenuta l'autorizzazione, i dispositivi e gli altri mezzi di sicurezza, di segnalazione, di protezione e di misurazione; e. non compiere, di propria iniziativa, operazioni o manovre che non sono di loro competenza o che possono compromettere la protezione e la sicurezza. Il presente opuscolo e' stato scritto con il duplice scopo di dare un contributo per l'adempimento dell'obbligo stabilito dall'art. 61d) e di rendere i lavoratori piu' consapevoli dell'importanza di ottemperare, a loro volta, agli obblighi loro imposti dall'art. 64. Pertanto esso e' indirizzato a tutti indistintamente i lavoratori (dipendenti e ospiti) dei Laboratori Nazionali di Frascati e, per tale motivo, e' scritto nel linguaggio piu' semplice possibile, anche se l'uso di qualche termine tecnico si e' reso inevitabile. (*) Decreto del Presidente della Repubblica 13 febbraio 1964 n. 185, pubblicato sul supplemento ordinario della 'Gazzetta Ufficiale' n.95 del 16 aprile 1964 (Sicurezza degli impianti e protezione sanitaria dei lavoratori e delle popolazioni contro i pericoli delle radiazioni ionizzanti derivanti dall'impiego pacifico dell'energia nucleare). |
| 487 | 1992-06-24 | A POSSIBLE MASSIVE SOLUTION TO DYSON-EQUATION WITH SMALL GAUGE COUPLING | 1992 | LNF-92-059(P).pdf | G. PREPARATA, SHE - SHENG XUE | On the 'Planck lattice' possibly generated by the quantum fluctuations of gravity, we consider a 'rainbow' Dyson equation for fermion self-energy function by only taking the NJL and QED interactions into account. We find a finite inhomogeneous term adding to usual Dyson-equation in continuum space-time even with Nambu-Jona-Lasinio mass vanishing (M_njl). Thus, a massive solution to Dyson-equation is possible for small gauge couplings. |
| 485 | 1992-06-22 | ANGULAR DISTRIBUTIONS FOR F-ppg DECAYS AT DAFNE | 1992 | LNF-92-058(P).pdf | G. COLANGELO, P. J. FRANZINI | We derive the complete angular distribution for the \\phi\\rightarrow\\pi\\pi\\gamma processes with two pions in a C-even state which are of interest for the study of the f0(975) at a high luminosity e+e- collider such as the DAPHNE \\phi-factory. These are e+e- \\rightarrow\\phi\\rightarrow fo\\gamma\\rightarrow\\pi\\pi\\gamma, the background reaction e+e-\\rightarrow\\phi\\rightarow\\pi\\rho\\rightarrow\\pi\\pi\\gamma and, for charged pions, the process e+e-\\rightarrow\\rho\\rightarrow\\pi\\pi\\gamma and the interference of the f0 signal with this process. |
| 449 | 1992-06-20 | RAPPORTO ATTIVITA' 1991 | 1992 | LNF-92-057(IR).pdf | Curato dal Servizio Documentazione | Una tappa importante per il futuro dell'attivita' prevalente dei Laboratori Nazionali di Frascati e' stata segnata nel 1991 dal Workshop sulla fisica e gli esperimenti di DAPHNE. In esso sono state ampiamente discusse le tematiche scientifiche e le linee di approccio per la sperimentazione sulla nuova macchina. Si e' altresi' creata l'occasione per gettare le basi della formazione di ampie collaborazioni che proporranno, ed effettueranno, gli esperimenti. Il progetto della macchina e' entrato nella fase ingegneristica dettagliata ed ha rappresentato, da quest'anno e per i prossimi, l'attivita' preponderante della Divisione Acceleratori. Nel corso dell'anno 1991 il progetto LISA ha avuto notevoli avanzamenti: la macchina e' stata assemblata fino alle cavita' superconduttrici e sono iniziate le prove di trasporto fascio. In vista della fine della vita operativa di ADONE, tutte le attivita'sperimentali ad esso collegate sono state impegnate a sfruttare al massimo il tempo fascio. Fenice ha raccolto dati i cui risultati analizzati saranno disponibili nel 1992. JET Target, dopo aver messo a punto il sistema di tagging, ha offerto il fascio per le misure di assorbimento fotonucleare su nuclei leggeri e pesanti all'esperimento Asso. Ladon ha raccolto dati di reazioni fotonucleari sia su Si che su deuterio. Le due facilities su luce di sincrotrone, PULS e PWA, hanno svolto una intensa attivita' ampiamente descritta nel presente rapporto. Citiamo solo, per la novita' dell'argomento, i primi tentativi di applicazione della radiazione di sincrotrone in campo radiologico. Concludiamo sulle attivita' locali ricordando che sono iniziati i lavori per l'istallazione dell'antenna gravitazionale Nautilus. Per quanto riguarda gli esperimenti fuori dei Laboratori, Aleph, CDF, Flatev e Macro hanno continuato i run di presa dati e le analisi tese al raffinamento dei risultati raccolti, mentre SDL ha effettuato run preliminari. Tutti, o quasi, i gruppi sono stati impegnati in fasi di costruzione o di aggiornamento di parti degli apparati sperimentali. |
| 3870 | 1992-06-18 | Study of 12C and 16O Interactions with Nuclei at Incident Energies Varyng from 5 to 10 MeV/AMU - I - 12C + 197AU | 1992 | INFN-BE_92-2.pdf | P. Vergani E. Gadioli E. Vaciago P. Guazzoni L. Zetta G. Ciavola M. Jaskola P.L. Dellera V. Campagna C. Marchetta | |
| 486 | 1992-06-16 | SOLVING THE fo PUZZLE AT DAFNE | 1992 | LNF-92-055(P).pdf | J. LEE - FRANZINI, W. KIM, P. J. FRANZINI | At the end of 1995, the Frascati \\phi-factory will being delivering of the order of 500 \\phi-mesons/sec. This provides a unique opportunity to study the f0(975) in \\phi radiative decays, even for branching ratios which in some estimates could be as low as 1x10^-6. This unique, lightest scalar meson state is poorly described by current models, and more information is essential. By Monte Carlo studies we show that the smallest expected branching ratio can easily be measured in the decay f0\\rightarrow\\pi^0\\pi^0. In decays to \\pi+\\pi-, there are backgrounds from continuum processes. Interference between one of these processes and the f0 amplitude leads t very interesting and complex patterns. A complete study of the photon spectrum from e+e-\\rightarrow\\pi+\\pi-\\gamma at the peak, after suppression of continuum contributions by suitable kinematics and angular cuts, can determine the sign of the \\pi f0\\gamma coupling even for the smallest branching ratio, thus providing a totally new piece of information for the investigation of the nature of the f0. a similar study of the decay \\pi\\rightarrow\\eta'\\gamma shows that is branching ratio can be measured with very good accuracy, therefore measuring the gluon contents of light pseudoscalar mesons to high accuracy. |
| 484 | 1992-06-16 | ASYMMETRIES AND TIME EVOLUTION IN THE K0-K0 SYSTEM | 1992 | LNF-92-056(P).pdf | V. PATERA, A. PUGLIESE | Starting from the time evolution of the C-odd \\overline{K}^0 K^0 system, we study the CP, T and CPT violation by means of the experimentally measurable asymmetries. In particular in Kl\\rightarrow2\\pi CP violating decays an accuracy of \\simeq 2 x 10^-4 and 3 x 10^-3 on \\Re(\\epsilon'/\\epsilon) and \\Im(\\epsilon'/\\epsilon) seems to be achievable. CP, T and CPT violation parameters can be explored in K_s semileptonic decays with an accuracy of the order of 10^-3. |
| 448 | 1992-06-12 | THE DANTE CONTROL SYSTEM | 1992 | LNF-92-054(IR).pdf | B. CACCIA, V. DANTE, G. Di PIRRO, C. MILARDI, A. STECCHI, L. TRASATTI, S. VALENTINI | DANTE (DAPHNE New Tools Environment) is a control system designed for the DAPHNE \\Phi-Factory. The design goals of the system have been software simplicity and reliability through the use of standard programs and general structure streamlining through the use of point to point fast links and of a polling configuration. Standard commercial components have been used both for hardware and software wherever possible, to take advantage of the huge amount of new development tools which are available in the field of computing, data acquisition and controls. |
| 447 | 1992-06-11 | KLOE TECHNICAL NOTE | 1992 | LNF-92-051(NT).pdf | A. CECCARELLI, B. DULACH | Visto il recente interesse nella costruzione di calorimetri E.M. realizzat con fibre scintillanti, si e' reso necessario comprendere il comportamento alle sollecitazioni meccaniche, del composito piombo-colla-fibre scintillanti, individuandone sia il parametro elastico (E) (modulo di Young) sia i parametri di resistenza alla trazione e flessione. |
| 483 | 1992-06-11 | APPARATO PER EXAFS DISPERSIVO AL PULS | 1992 | LNF-92-053(IR).pdf | F. D' ACAPITO, F. BOSCHERINI, S. MOBILIO, A. MARCELLI, L. SANGIORGIO, F. CAMPOLUNGO, V. SCIARRA, V. TULLIO, L. MORETTO | In this note the setting-up of a dispersive-EXAFS apparatus is described. After a short description of its working principle, the design criteria and the details of our spectrometer are shown. Finally, the complete apparatus characterization, with the comparison with theoretical estimates, and some typical spectra are presented. |
| 482 | 1992-06-10 | DATA EXCHANGE BETWEEN A PS/2 AND A MACINTOSH-IICX DURING DATA ACQUISITION BY AN X-RAY POWDER DIFFRACTION STATION | 1992 | LNF-92-050(P).pdf | G. CAPPUCCIO, A. KREINES | Data transfer between two entirely incompatible computers is always a difficult problem to solve. If some time-delay can be accepted in the data transfer, it is possible to port files between a Macintosh and an IBM PC, using a special software package, like LapLink Mac III(1). Here, we present a successful solution of a real-time information exchange between a PS/2 and a Macintosh IIcx. The PS/2, which controls an X-ray powder diffractometer through its manager program, by means of a resident routine seizes the interrupts from the data acquisition units, reads the data and transfers them to the Macintosh. On the Macintosh, a simple program is responsible for the data receipt, display, and save. |
| 429 | 1992-06-10 | Oservations of Cosmic Ray Electrons and Positrons Using an Imaging Calorimeter | 1992 | LNF-92-052(P).pdf | R. L. Golden, C. Grimani, B. L. Kimbell, S. A. Stephens, S. J. Stochaj, W. R. Webber, G. Basini, F. Bongiorno, F. M. Brancaccio, M. Ricci, J. F. Ormes, E. S. Seo, R. E. Streitmatter, P. Papini, P. Spillantini, M. T. Brunetti, A. Codino, M. Menichelli, I. Salvatori, M. P. De Pascale, A. Morselli, P. Picozza | On september 5, 1989 a ballon-borne magnet spectrometer system was flown for 5.5 hr at an altitude of more than 117,000 ft from Prince Albert, Saskatshewan (Canada). The instrument was a modified version of the one used to observe antiprotons in 1979. The most significant modulation was the addition of an imaging calorimeter, 7.33 radiation lengths thick. Inclusion of the calorimeter has significantly improved the ability to distinguish electrons and positrons from the other constituents of the cosmic rays. The absolute electron flux has been determined in the energy interval 1.3-26 GeV (corrected to the top of the atmosphere). At energies above 4 GeV, the electron spectrum at the top of the atmosphere can be represented by a power-law spectrum with constant spectral index. The electron spectrum was found to be J_e- =177 . E^-(3.15+-0.13) electrons/m^2-sr-s-GeV in the energy range 4.0-26 GeV. Below 4 GeV the spectrum showed significant flattening. The e+/(e^+ +e-) ratio was found to be (0.11+-0.03) in the energy range 5.2 - 13 Gev. |
| 3869 | 1992-06-09 | The Jp=1/2+, T=1/2 Level in the 5He and 5Li Mirror Nuclei | 1992 | INFN-BE_92-1.pdf | P. D'Agostino G. Fazio G. A. Italiano | |
| 445 | 1992-06-05 | SEMILEPTONIC KAON DECAYS IN CHIRAL PERTURBATION THEORY | 1992 | LNF-92-047(P).pdf | J. BIJNENS, G. ECKER, J. GASSER | We present the matrix elements for the semileptonic kaon decays K_l2\\gamma, K_l2l+l-, K_l2l'+l'-, K_l3, K_l3\\gamma and K_l4 at next-to-leading order in chiral perturbation theory and compare the predictions with experimental data. Monte Carlo event generators are used to calculate the corresponding rates at DAPHNE. We discuss the possibilities to improve our knoledge of the low-energy structure of the Standard Model at this and similar machines. |
| 481 | 1992-06-05 | MASS GENERATION IN THE STANDARD MODEL | 1992 | LNF-92-048(R).pdf | SHE - SHENG XUE | A proposal of mass generation in the Standard Model (SM) is presented, based on the idea that the violent fluctuations of quantum gravity at the Planck scale plays a nature regulator for the SM with fundamental length a_p \\sim 10^-33cm, thus gauge invariant four-interactions are necessary due to the 'no-go' theorem of Nielsen and Ninomiya, forbidding a sensible formulation of the usual electroweak action on a such 'Planck lattice'. We present that for certain values of the new four-fermion couplings a spontaneous violation of SM chiral symmetry emerges which (i) avoids the 'no-go' theorem, (ii) produces a \\overline{t}t condensate model without appearance of the low-energy Higgs boson. The mass generation of other fermions and intermediate gauge bosons, are briefly discussed. |
| 446 | 1992-06-05 | BCS SUPERCONDUCTIVITY AND THE ELECTRON-PHONON INTERACTION | 1992 | LNF-92-049(IR).pdf | G. PREPARATA | |
| 480 | 1992-06-04 | PHYSICS AT DAFNE | 1992 | LNF-92-046(P).pdf | J. LEE - FRANZINI | We describe the physics which can be done at DAPHNE, the \\phi factory under construction at the Laboratori Nazionali di Frascati dell'INFN, which includes: (1) The complete determination of 16 independent parameters which describe the K_S-K_L system, mostly through precision interferometry between pairs of same, different, and one versus sum of the other (inclusive) final states. These measurements allow independent determinations of the five (CPT) violating parameters, as well as high precision determinations of three (CP) violation parameters, which include \\Re(\\epsilon'/\\epsilon) and \\xi(\\epsilon'/\\epsilon). \\Re(\\epsilon'/\\epsilon) can also be determined to an equivalent accuracy using the 'double ratio' method, and \\epsilon from precision measurements of asymmetries in K_L semileptonic decays. (2) The first probable observation of CP violation in the K_S system by seeing K_S\\rightarrow\\pi^0\\pi^0\\pi^0 events, and asymmetries in rates of K_S semileptonic decays. (3) Searches for other direct CP violating effects in asymmetries in neutral and charged K\\rightarrow 3\\pi decay distributions and in K_+-\\rightarrow\\pi^+-\\pi^0\\gamma decay rates. (4) Precision measurements of the form factors in K semileptonic decays and tests of Chiral Perturbation Theory. (5) Studies of radiative \\decays to resolve puzzles in light meson spectroscopy. (6) The study of K-nucleon interaction. (7) The study of hypernuclei formation and decay. All but the last topic can be studied using the general purpose detector KLOE, which is being designed and built for running at DAPHNE. A special purpose detector, FINUDA. is being proposed for hypernuclei physics. |
| 479 | 1992-06-03 | ON N = 3 SUPER-KdV EQUATION | 1992 | LNF-92-045(P).pdf | S. BELLUCCI, E. IVANOV, S. KRIVONOS | We construct a one-parameter family of N=3 supersymmetric extensions of the KdV equation as a Hamiltonian flow on a N=3 superconformal algebra and argue that it is non-integrable for any choice of the parameter. Then we propose a modified N=3 super KdV equation which possesses the higher order conserved quantities and so is a candidate for an integrable system. Upon reduction to N=2, it yelds the recently discussed 'would-be integrable' version of the N=2 super KdV equation. In the bosonic core it contains a coupled system of the KdV type equation and a three-component generalization of the mKdV equation. We give a Hamiltonian formulation of the new N=3 super KdV equation as a flow on some contraction of the direct sum of two N=3 superconformal algebras. |
| 3856 | 1992-06-01 | Rejection Power of a Horizontal RPC Telescope for Left and Right Coming Cosmic Muons | 1992 | INFN-AE_92-18.pdf | F. D'Aquino G. Iaselli S. Nuzzo A. Ranieri F. Romano P. Pistilli M. Ambrosio G.C. Barbarino B. Bartoli D. Campana M. Iacovacci F. Guarino G. Osteria V. Silvestrini S. Del Sordo L. Scarsi G. Bressi A. Lanza M. Bonori A. Nigro R. Cardarelli R. Santonico M. Guida G. Marini | |
| 5697 | 1992-05-26 | A SILICON IMAGING CALORIMETER PROTOTYPE FOR ANTIMATTER SEARCH IN SPACE: EXPERIMENTAL RESULTS. | 1992 | INFN-AE-92-17.pdf | G. Barbiellini, G. Basini, V. Bidoli, M. Bocciolini, M. Boezio, F. Bongiorno, F. Massimo Brancaccio, M.T. Brunetti, A. Buccheri, M. Candusso, F. Celletti, A. Codino, C. De Fabritiis, M.P. De Pascale, F. Fratnik, A. Incicchitti, M. Menichelli, M. Miozza, A. Morselli, A. Perego, P. Picozza, D. Prosperi, I. Salvadori, P. Schiavon, P. Spillantini, M. Ricci, A. Vacchi, N. Zampa. | This report presents the results obtained with a prototype silicon-tungsten (Si-W), electromagnetic calorimeter conceived as a fine-grained imaging device to carry out studies of the antimatter component in primary cosmic radiation. The calorimeter prototype contains 20 <i>xy</i> sampling layers interleaved with 19 showering material planes. One sensitive layer is obtained with two silicon strip detectors (Si-D)(60 x 60) mm<sup>2</sup>, each divided into 16 strips, 3.6 mm wide; the two detectors are assembled back to back with perpendicular strips. This allows the transverse distributions of the shower in both coordinates at each sampling (0.5 X<sub>o</sub>) to be pictured. The basic characteristics of the design and the experimental results obtained on a test beam at the CERN Proton Synchrotron (PS) for electrons and pions are reported. The main results presented are the response of the calorimeter to the electron at various energies (1-8 GeV), and the transverse shower profiles at different calorimeter depths as well as the patterns of the electromagnetic shower and those of the interacting and non-interacting pions. The capability of the calorimeter in measuring the direction of the incoming electromagnetic particle from the pattern of the shower has been evaluated at different energies. These results are encouraging in view of the possible use of this detector to search for high-energy γ sources in space. |
| 3855 | 1992-05-26 | A Silicon Image Calorimeter Prototype for Antimatter Search in Space: Experimental Results | 1992 | INFN-AE_92-17.pdf | A. Vacchi et al. | |
| 443 | 1992-05-25 | CP AND CPT VIOLATION IN NEUTRAL KAON DECAYS | 1992 | LNF-92-043(P).pdf | L. MAIANI | The study of CP violation in neutral K decays has been, from the outset, the primary goal of high-luminosity \\Phi-factory, like DAPHNE. At the beginning, attention was focussed almost exclusively on the measurement of the direct CP-violation parameter, \\varepsilon'/ \\varepsilon. Due to the very interesting work of Buchanan et al.[1], it has been realized that, in addition, a \\Phi-factory offers the unique possibility to make a clean test of the CPT symmetry, at the level of precision of 10^-4 or so, and which is indipendent from possible conspiracies, still allowed in the presently measured quantities. The aim of the present article is to provide a self-consistent introduction to the phenomenology of CP and CPT violation in neutral Kaon decays and to give a first illustration of the impact of DAPHNE on the issue of the CPT symmetry. More details are provided in the subsequent papers in this Chapter^[2,3]. Present calculations of \\varepsilon'/ \\varepsilon in the Standard Theory are also retrieved here, while CP violation in charged Kaon decays is deferred to a later part of this Report^[4]. Of course, there exist in the literature many excellent reviews of the subject, starting from the classical and influential article of Lee and Wu^[5]. In the more recent literature, CPT symmetry in Kaon decays has been analyzed by Barmin et al.[6] and, with reference to the experiments at a \\Phi-factory, in reff.[7.1]. |
| 444 | 1992-05-25 | DAFNE SHIELDING | 1992 | LNF-92-044(IR).pdf | A. ESPOSITO, M. PELLICCIONI | A new luminosity e+e- storage ring DAPHNE (Double Annular \\Phi factory for Nice Experiments) is under construction at Frascati National Laboratories. The new complex consists of three accelerators: the Linac, the Accumulator and the Main Rings. In this report we present the project for the DAPHNE shielding and the philosophy adopted. |
| 3886 | 1992-05-23 | Radiation Effects on CDF AC–Coupled Microstrip Silicon Detectors | 1992 | INFN-TC_92-8.pdf | N. Bacchetta D. Bisello G. Bolla C. Canali P.G. Fuochi A. Paccagnella | |
| 3887 | 1992-05-23 | High Voltage Pulser for Streamer Tubes at the SLD | 1992 | INFN-TC_92-9.pdf | N. Bacchetta D. Bisello L. Castellani A. Castro | |
| 478 | 1992-05-22 | TWO PHOTON PHYSICS AT DAFNE | 1992 | LNF-92-042(P).pdf | A. ZALLO | The DAPHNE \\gamma\\gamma physics program is reviewed. It is shown that although the phase space available at such machine is rather small, nevertheless it coverts a region of great theoretical interest which gives the possibility to do very precise tests of Chiral Perturbation Theory. |
| 3895 | 1992-05-21 | Guida alla Gestione di Sistemi di Calcolo | 1992 | INFN-TC_92-17.pdf | E. Ghermandi M.L. Luvisetto E. Ugolini | |
| 3894 | 1992-05-15 | Guide to VI and EX Editors | 1992 | INFN-TC_92-16.pdf | E. Ugolini | |
| 5696 | 1992-05-11 | LA VIOLAZIONE DI CP A DAΦNE: STUDIO DEL CALORIMETRO ELETTROMAGNETICO. | 1992 | INFN-AE-92-16.pdf | R. Sangoi. | Nel mondo delle particelle elementari il sistema del mesone <i>K</i> rappresenta un caso davvero unico, tanti sono i singolari fenomeni prettamente quantistici che in esso si manifestano; fra tali fenomeni, particolare importanza riveste la rottura della simmetria per la trasformazione <i>composta coniugazione di carica-inversione spaziale</i>, detta più brevemente violazione di <i>CP</i>. Questa violazione e stata chiaramente osservata nei decadimenti del mesone <i>K</i> neutro a vita lunga (<a href='https://www.codecogs.com/eqnedit.php?latex=K_{L}^{o}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?K_{L}^{o}' title='K_{L}^{o}' /></a>) ma, nonostante sia conosciuta sin dal 1964, non si è ancora potuto stabilire con certezza quale sia il meccanismo che la genera, causa soprattutto la piccolissima entità del fenomeno. Attualmente due sole teorie sono consistenti con i dati sperimentali raccolti: il Modello Standard con tre famiglie di quark e l'ipotesi Superdebole di Wolfenstein. Tali teorie sono entrambe in grado di riprodurre il valore misurato di <a href='https://www.codecogs.com/eqnedit.php?latex=\varepsilon' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\varepsilon' title='\varepsilon' /></a>(~2.26 x 10<sup>-3</sup>), parametro che esprime la violazione di CP dovuta al mixing <a href='https://www.codecogs.com/eqnedit.php?latex=K^{o}\leftrightarrow&space;\bar{K}^{o}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?K^{o}\leftrightarrow&space;\bar{K}^{o}' title='K^{o}\leftrightarrow \bar{K}^{o}' /></a>. Esse differiscono invece nelle previsioni sul parametro <a href='https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\varepsilon&space;'' title='\varepsilon '' /></a> che quantifica la violazione di CP diretta <i>K</i><sub>2</sub>-->ππ, dove <i>K</i><sub>2</sub> indica l'autostato dispari per CP (CP|<i>K</i><sub>2</sub> > = -|<i>K</i><sub>2</sub>>) preponderante in <a href='https://www.codecogs.com/eqnedit.php?latex=K_{L}^{o}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?K_{L}^{o}' title='K_{L}^{o}' /></a>; mentre infatti il Modello Standard consente valore pur piccoli di <a href='https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'(\approx&space;10^{-6})' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\varepsilon&space;'(\approx&space;10^{-6})' title='\varepsilon '(\approx 10^{-6})' /></a>, la Teoria Superdebole richiede che tale parametro sia sostanzialmente nullo. Purtroppo le misure di <a href='https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\varepsilon&space;'' title='\varepsilon '' /></a>,o meglio di grandezze dalle quali poi ricavarne una stima, non sono per nulla semplici; le più recenti esperienze, condotte su fasci di <i>K</i> prodotti per urto di protoni su bersaglio fisso, hanno finora fornito risultati contraddittori, o quantomeno non dotati della precisione necessaria a distinguere fra i due modelli teorici. Un nuovo promettente approccio sperimentale al problema e rappresentato dalle <a href='https://www.codecogs.com/eqnedit.php?latex=\phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\phi' title='\phi' /></a>-factory, collisori e<sup>+</sup>e<sup>-</sup> ad altissima luminosità capaci di produrre un elevato numero di mesoni <i>K</i> in condizioni estremamente favorevoli; DAC<a href='https://www.codecogs.com/eqnedit.php?latex=\Phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Phi' title='\Phi' /></a>NE, la <a href='https://www.codecogs.com/eqnedit.php?latex=\phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\phi' title='\phi' /></a>-factory attualmente in fase di sviluppo presso i Laboratori Nazionali di Frascati, si prefigge il fondamentale risultato di una misura di <a href='https://www.codecogs.com/eqnedit.php?latex=\varepsilon&space;'' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\varepsilon&space;'' title='\varepsilon '' /></a> in grado di chiarire definitivamente la natura della violazione di <i>CP</i>. Un rivelatore per misure di <i>CP</i> a DA<a href='https://www.codecogs.com/eqnedit.php?latex=\Phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Phi' title='\Phi' /></a>NE , cosi come per le altre <a href='https://www.codecogs.com/eqnedit.php?latex=\phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\phi' title='\phi' /></a>-factory, deve soddisfare richieste molto stringenti, in particolare per quanta riguarda il calorimetro elettromagnetico; in questa tesi, dopo una introduzione teorico/fenomenologica ed un rapporto sull'attuale stato sperimentale, vengono illustrate le soluzioni tecniche proposte per il rivelatore KLOE a DA<a href='https://www.codecogs.com/eqnedit.php?latex=\Phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Phi' title='\Phi' /></a>NE. In particolare è esposto il lavoro svolto dal gruppo DA<a href='https://www.codecogs.com/eqnedit.php?latex=\Phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Phi' title='\Phi' /></a>NE di Trieste/Udine, sull'ipotesi di un calorimetro elettromagnetico a campionamento basato su piombo ed olio scintillante. Lo sviluppo di tale ipotesi, ampiamente studiata dal punto di vista calorimetrico tramite simulazioni MonteCarlo, ha condotto alla progettazione e costruzione di un prototipo sperimentale, sul quale sono state eseguite misure di attenuazione di segnali luminosi. |
| 473 | 1992-05-06 | SINGLE TOP PRODUCTION AT LEP I I | 1992 | LNF-92-037(P).pdf | O. PANELLA, Y. N. SRIVASTAVA, G. PANCHERI | |
| 472 | 1992-05-05 | CLUSTER COUNTING IN A HELIUM BASED GAS MIXTURE | 1992 | LNF-92-036(P).pdf | G. BENCIVENNI, E. CARRADORI, G. FELICI, F. ZECCHINATO | In this paper the experimental results obtained irradiated with a collimated \\beta-source a drift tube filled with an He(95%)/C_4H_10(5%) gas mixture are presented. An upper limit for primary ionization of 7.1 +- 0.3 i.p./cm has been measured. A cluster counting detection efficiency of at least 87% is achieved. The experimental data are compared with the results obtained with a MC simulation reproducing the experimental set-up and based on GARFIELD code. |
| 3853 | 1992-05-05 | Progetto di un Front–End a Risposta Logaritmica per un Rivelatore RICH | 1992 | INFN-AE_92-15.pdf | F. Fontanelli V. Gracco F. Montano M. Sannino | |
| 442 | 1992-04-30 | CHIRAL PERTURBATION THEORY AND RADIATIVE V0->P0P0g DECAYS | 1992 | LNF-92-34(P).pdf | A. BRAMON, A. GRAU, G. PANCHERI | An attempt to extend Chiral Perturbation Theory to radiative vector-meson decays into two neutral pseudoscalars, V^0\\rightarrow\\P^0 P^0\\gamma, is presented. The effects of (chiral) loops are found to be important. Unambiguous predictions are given for \\phi\\rightarrow\\pi^0\\pi^0\\gamma, \\pi^0\\eta\\gamma, \\rho\\rightarrow\\pi^0\\pi^0\\gamma and other processes to be measured in proposed, low-energy e+e- - machines. |
| 471 | 1992-04-30 | THE EFFECTIVE PHOTON-PSEUDOSCALAR ANOMALOUS INTERACTIONS: e+e- -> p+ p- p0, p0g, hg, p0g* | 1992 | LNF-92-035(P).pdf | A. BRAMON, A. GRAU, E. PALLANTE, G. PANCHERI, R. PETRONZIO | We discuss the next-to-leading effective chiral Lagrangian describing the interaction of photons with pseudoscalars and the possibility of determining some of its parameters at Daphne, the Frascati \\Phi-factory. Different formalisms dealing with the introduction of (vector-meson) resonances and their saturation of counterterms are examined. We show that one can get unambiguous predictions for the renormalized paramenters of this Lagrangian thought the measurement of the processes e+e- \\rightarrow 3\\pi, \\pi^0\\gamma, \\eta\\gamma and \\pi^0\\mu^+\\mu^-. |
| 3852 | 1992-04-27 | Three Applications of Neutral Networks for High Energy Physics | 1992 | INFN-AE_92-14.pdf | S. Bianchin et al. | |
| 5695 | 1992-04-27 | THREE APPLICATIONS OF NEURAL NETWORKS FOR HIGH ENERGY PHYSICS. | 1992 | INFN-AE-92-14.pdf | S. Bianchin, G. Cosmo, P. Garlatti Costa, A. De Angelis, M. DeNardi, B. Denby, M. Dickson, P. Eerola, J. Kalkkinen, L. Lanceri, A. Linussio, G. Pauletta, L. Santi, C. Vignaduzzo, A. Zoppolato, N. Weiner. | This note collects three presentations te the Second International Workshop on Software Engineering, Artificial Intelligence and Expert Systems for High Energy and Nuclear Physics, held in Lalonde sur Maures (France), in January 1992. The three presentations deal with classification problems: events in Z<sup><small>O</small></sup> decays, pions in an electromagnetic calorimeter, and jets in hadronic collisions. |
| 470 | 1992-04-24 | DAFNE MACHINE PROJECT | 1992 | LNF-92-033(P).pdf | DAFNE Project Team | The Frascati National Laboratories \\Phi-factory project consists of a two rings e+e- collider, an accumulator ring and a full energy linac injector. The lattice for the main ring and the accumulator is frozen, the vacuum system has been dimensioned, and the engineering design of the various components is in progress. An R&D program on the suppression of high order modes, leading to multibunch instabilities, is also in progress. In the following a general overview of the project is given. |
| 3892 | 1992-04-24 | Un Sistema di Raffreddamento per la Facility Jet–Target Installata in ADONE | 1992 | INFN-TC_92-14.pdf | M.Taiuti E.Durante U.Lantero F.Parodi | |
| 3893 | 1992-04-24 | Studio delle Prestazioni di un Piccolo Contatore Cerenkov ad Aerogel | 1992 | INFN-TC_92-15.pdf | M. Anghinolfi L. Mazzaschi M. Ripani A. Rottura | |
| 469 | 1992-04-22 | CONFINEMENT IN NONCOMPACT NONABELIAN GAUGE THEORIES ON THE LATTICE | 1992 | LNF-92-032(P).pdf | F. PALUMBO, M. I. POLIKARPOV, A. I. VESELOV | We have investigated by Monte Carlo simulation a recently proposed lattice regularization of gauge theories where the gauge fields are noncompact but gauge-invariance is exact. We have found a nonvanishing value of the string tension. |
| 3891 | 1992-04-22 | Measurements on the Flux of Environmental Neutrons in the Mediterranean Sea | 1992 | INFN-TC_92-13.pdf | E. Fiorini S. Latorre S. Sverzellati L. Zanotti | |
| 3890 | 1992-04-21 | Gas System Controller for RPC | 1992 | INFN-TC_92-12.pdf | M. Panareo | |
| 467 | 1992-04-16 | STRANGE-PARTICLE PRODUCTION IN -p-Xe ANNIHILATION AT REST AND AT 0.4-0.9 GeV/c | 1992 | LNF-92-030(P).pdf | V. V. BARMIN, V. G. BARYLOV, G. V. DAVIDENKO, V. S. DEMIDOV, A. G. DOLGOLENKO, V. M. GOLUBCHIKOV, V. A. MATVEEV, A. G. MESHKOVSKY, G. S. MIROSIDI, A. N. NIKITENKO, V. A. SHEBANOV, N. N. SHISHOV, B. S. VOLKOV, N. K. ZOMBKOVSKAJA, A. D. ANDRJAKOV, E. V. DEMIDOVA, V. A. ERGAKOV, YU. V. TREBUKHOVSKY, C. GUARALDO, J. CUGNON, J. VANDERMEULEN | From a sample of 20000 \\overline{p}-Xe annihilations obtained in the bubble chamber DIANA a search has been made for strange particle production at rest and in flight (0.4\\div 0.9 GeV) taking advantage also of the unique capability of the chamber to detect neutral (photon) channels. Inclusive features such as \\Lambda, K^0_s and \\Sigma^0 rates are presented, together with momentum and rapidity distributions. Semi-inclusive double strangeness final state \\LambdaKX, \\SigmaKX and K\\overline{K}X are also presented. The observation of almost all strange channels allowed to deduce the total strangeness content. The K/ \\pi ratios, together with the mean multiplicities of protons, \\pi^ +- and \\pi^0-mesons associated or not to strangeness production, are also given. The results have been compared with a modified version of the standard intranuclear cascade model, obtaining a remarkable good agreement under the assumption that the produced hyperons have no further nuclear interaction (no elastic scattering and no sticking). |
| 468 | 1992-04-16 | NEW METHOD FOR COMPARISON OF EXAFS SPECTRA AT THE L EDGES: APPLICATION TO THE THEORETICAL AND EXPERIMENTAL L1 AND L2,3 EDGES OF BARIUM IN BaF2 | 1992 | LNF-92-031(R).pdf | J. CHABOY, J. GARCIA, A. MARCELLI | In this paper we discuss a new method for direct comparison between L_2,3 and L_1 EXAFS spectra. A detailed analysis of the basic EXAFS formula leads to a simple relationship between the EXAFS signals at the L_3 and L_1 edges that includes the total phase-shift difference for the two absorption processes. This relation has been successfully used to perform the comparison of theoretical and experimental data of barium in the cubic BaF_2 system. |
| 3888 | 1992-04-13 | Evaluation of the Neutron Yield Produced in a D–D + D–T Plasma by Monte Carlo Simulation | 1992 | INFN-TC_92-10.pdf | M. Boero C. Manfredotti C. Ongaro A. Zanini | |
| 3889 | 1992-04-13 | Phenomenological Analysis of the Li(n,a)T Scattering in Plasma Produced Neutrons | 1992 | INFN-TC_92-11.pdf | M. Boero F. Fizzotti C. Manfredotti C. Ongaro A. Zanini | |
| 466 | 1992-04-10 | BROKEN SUPERSYMMETRY IN THE MATRIX MODEL ON A CIRCLE | 1992 | LNF-92-029(P).pdf | S. BELLUCCI | We consider the discretization of a D = 2 surface using polygons. We map the surface onto superspace and integrate over surfaces of arbitrary genus, obtaining a discretized version of the Green-Schwarz string in D = 1. Taking an unusual critical limit of the supersymmetric matrix model involved, we construct exact solutions, to all perturbative orders, for the discretized superstring in one dimension, both when the target space is a real line and when the theory is represented in terms of matrix variables on a circle of finite radius. We comment on the behaviour of the compactified perturbative expansion under duality tranformations. |
| 462 | 1992-04-09 | PREDICTING THE STATISTICAL ACCURANCY OF AN EXPERIMENT | 1992 | LNF-92-024(P).pdf | P. FRANZINI | We discuss a general method for estimating the number of events required to obtain a given accuracy in teh measurement of a parameter of a theory. Simple examples are given. We also discuss resolution effects. |
| 463 | 1992-04-09 | RADIATIVE f DECAYS: EXPERIMENTAL PROBLEMS | 1992 | LNF-92-025(P).pdf | J. L. FRANZINI, W. KIM, P. J. FRANZINI | Experimental issues associated with measuring rare \\phi radiative decays at DAPHNE are discussed. We have studied by Monte Carlo simulation the detection of \\phi\\rightarrow f0\\gamma, both for f0\\rightarrow\\pi^0\\pi^0 and f0\\rightarrow\\pi^+\\pi^-, in a minimal high precision spectrometer, CUSB. We find that, BR's as small as 1 x 10^-6 are measurable if all final particles are neutral, even assuming BR(\\phi\\rightarrow\\pi^0\\pi^0\\gamma) is 10^-3, the experimental upper limit. We find, that the general purpose detector KLOE will achieve even higher accuracy, because of its hermeticity and fine segmentation. For f0\\rightarrow\\pi^+\\pi^-, we found that CUSB's sensitivity is limited to BR's of the order of 10^-5, whereas KLOE is sensitive to the smallest expected BR. We have included in the analysis the background process e+e-\\rightarrow\\phi\\rightarrow\\pi\\pi\\gamma, via a \\rho\\pi intermediate state. The matrix element and angular distributions for this process are given in the appendix. We also find that KLOE can measure the BR(\\phi\\rightarrow\\mu'\\gamma) down to \\sim10^-6. |
| 464 | 1992-04-09 | BACKGROUNDS AND INTERFERENCE ON THE f0 | 1992 | LNF-92-026(P).pdf | J. L. FRANZINI, W. KIM, P. J. FRANZINI | We present in this paper a complete study of the physical backgrounds, coherent and incoherent, in the 20-100 MeV photon spectrum from e+e-\\rightarrow\\pi^+\\pi^-\\gamma at the \\phi peak, of relevance to \\phi\\rightarrow f0\\gamma\\rightarrow\\pi^+\\pi^-\\gamma. Continuum contributions are suppressed by suitable kinematics and angular cuts. We show that we can determine the sign of the \\phi f0\\gamma coupling even for the smallest branching ratio expected for \\phi\\rightarrow f0\\gamma, thus have the promise of a totally new piece of information on the nature of the f0. |
| 465 | 1992-04-09 | CHIRAL PERTURBATION THEORY PREDICTS PION PION PRODUCTION VIA PHOTON PHOTON FUSION | 1992 | LNF-92-027(P).pdf | S. BELLUCCI | we describe the low energy physics of the \\gamma\\gamma\\rightarrow\\pi\\pi reaction. Then we discuss new high-luminosity experiments that will provide the opportunity to measure the 2-loop effects, within chiral perturbation theory, for the \\pi^0\\pi^0 case. |
| 460 | 1992-04-08 | f->p+ p- g AT DAFNE | 1992 | LNF-92-022(P).pdf | A. BRAMON, G. COLANGELO, P. J. FRANZINI, M. GRECO | The possible detection of the reaction \\phi\\rightarrow f_0(975)\\gamma\\rightarrow\\pi^+\\pi^-\\gamma at Daphne is discussed together with the initial and final state background radiation. The size of the effect is shown to depend crucially on the relative sign of the e^+ e^-\\rightarrow\\rho\\rightarrow\\pi^+\\pi^- and e+e- \\rightarrow\\phi\\rightarrow\\pi^+\\pi^-\\gamma amplitudes. A detailed study of the angular distributions as well as numerical results are also given. |
| 461 | 1992-04-08 | RADIATIVE CORRECTIONS AT DAFNE | 1992 | LNF-92-023(P).pdf | G. COLANGELO, S. DUBNICKA, M. GRECO | The status of QED radiative corrections in the vicinity of the \\phi is summarized for leptonic and \\pi^+\\pi^-, K^+K^-, K^0, \\overline{K^0} final states. Simple analytical formulae are given of immediate phenomenological application. A few numerical examples are also given explicitly. |
| 459 | 1992-04-06 | CORRECTIONS TO K->pgg FROM K->3p | 1992 | LNF-92-021(P).pdf | L. CAPPIELLO, G. D'AMBROSIO, M. MIRAGLIUOLO | In the framework of chiral perturbation theory we compute the \\DeltaI = 3/2 contribution to K_L \\rightarrow\\pi^0\\gamma\\gamma. As for the \\DeltaI = 1/2 transition, the result turns out to be unambiguously predicted and finite. We discuss also the effects on this decay coming from 0(p^4) corrections to K\\rightarrow 3\\pi. As a by-product we have also a prediction for the CP conserving amplitude A(K_L\\rightarrow\\pi^0 e+e-). |
| 3851 | 1992-04-03 | Neural Networks in Experimental High–Energy Physics | 1992 | INFN-AE_92-13.pdf | C. Bortolotto et al. | |
| 5694 | 1992-04-03 | NEURAL NETWORKS IN EXPERIMENTAL HIGH-ENERGY PHYSICS. | 1992 | INFN-AE-92-13.pdf | C. Bortolotto, A. De Angelis, N. De Groot, J. Seixas. | During the last years, the possibility to use Artificial Neural Networks in experimental High Energy Physics has been widely studied. In particular, applications to pattern recognition and pattern classification problems have been investigated. The purpose of this article is to review the status of such investigations and the techniques established. <i>Keywords</i>: Neural networks; Classification problems; Optimization problems; Taxonomy; Nonlinear separators. |
| 458 | 1992-04-02 | DESIGN OF A HYBRID PERMANENT MAGNET QUAD PROTOTYPE AS A POSSIBLE CANDIDATE FOR THE INTERSECTION REGIONS OF DAFNE | 1992 | LNF-92-020(P).pdf | C. SANELLI, A. CATTONI, L. BARBAGELATA, F. CRENNA, M. GRATTAROLA, G. C. GUALCO, F. ROSATELLI | A hybrid, tunable, p.m. quadrupole prototype for Daphne has been designed and built in a collaboration between Ansaldo Ricerche-Genova and the Frascati National Laboratory Magnet Group. Magnetic calculation, constructive design and the first accettance test results are briefly reported in this note. The leading ideas in conceiving this new type of mechanical set up, aimed to supply a magnetic lens with an iron dominated gradient quality and an effective possibility of easily adjusting the field profile and the magnetic length, are described. The large aperture radius compared to the very contained overall external dimensions of the joke, make this type of magnet suitable for the low-beta insertions of the Daphne storage rings, where the large vacuum chamber accettance needed and the very severe constraints imposed by the detectors, discourage the use of resistive or superconducting electromagnets. In addition a 15% tunability, only by actuating a couple of iron wedges per pole, gives to this quad possibility of meeting the optimum gradient values that will be effectively known only after the commissioning of the machine. |
| 440 | 1992-04-01 | KLOE a General Purpose Detector for DAFNE | 1992 | LNF-92-19(IR).pdf | KLOE Collaboration | |
| 457 | 1992-03-30 | A THEORETICAL STUDY OF THE c AND b FRAGMENTATION FUNCTION IN e+e- ANNIHILATION | 1992 | LNF-92-017(P).pdf | G. COLANGELO, P. NASON | we present an analysis of the c and b fragmentation functions which includes in a consistent fashion leading and next-to-leading perturbative contributions, effects due to soft gluon emission and a parametrization of effects of non-perturbative origin. We show that the data on D meson production at intermediate energy constrains the parametrization of the effects of non-perturbative nature. We can therefore make a prediction for the B fragmentation functions at LEP energy are given, and compared with existing data. |
| 439 | 1992-03-30 | Symmetric Tunnelling Junctions with NbZr Superconducting Thin Films | 1992 | LNF-92-018(R).pdf | D. Di Gioacchino, U. Gambardella, V. Boffa, G. Paternò, M. Cirillo | |
| 5693 | 1992-03-24 | BEAM TEST OF A LARGE AREA SILICON DRIFT DETECTOR. | 1992 | INFN-AE-92-12.pdf | G. Ballocchi, A. Castoldi, S. Chinnici, P.T. Cox, E. Gatti, P. Giacomelli, P. Holl, J. Kemmer, A. Longoni, F. Palma, P. Rehak, M. Sampietro, A. Vacchi. | The results from the tests of the first large area (4 x 4 cm<sup>2</sup>) planar silicon drift detector prototype in a pion beam are reported. The measured position resolution in the drift direction is <a href='https://www.codecogs.com/eqnedit.php?latex=\sigma' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\sigma' title='\sigma' /></a>=(40 ± 10)<a href='https://www.codecogs.com/eqnedit.php?latex=\mu' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\mu' title='\mu' /></a>m. |
| 3850 | 1992-03-24 | Beam Test of Large Area Silicon Drift Detectos | 1992 | INFN-AE_92-12.pdf | A. Vacchi et al. | |
| 3885 | 1992-03-23 | Measurement of Radiation Damage of Optical Fibers During Irradiation | 1992 | INFN-TC_92-7.pdf | D. Bisello A. Castro M. Cobal H. Grassmann S. Leone M. Loreti N. Piacentino | |
| 3884 | 1992-03-20 | Problemi Connessi alle Misure di Corrente Critica di Conduttori ad Alta Corrente (Attività Svolta nell'Ambito del Progetto Speciale Superconduttività) | 1992 | INFN-TC_92-6.pdf | P. Fabbricatore R. Musenich R. Parodi | |
| 3876 | 1992-03-19 | The Slowly Varying Envelop Approximation Revised | 1992 | INFN-FM_92-2.pdf | R. Bonifacio R.M. Caloi | |
| 3883 | 1992-03-17 | LATEX: Easy Recipes | 1992 | INFN-TC_92-5.pdf | M.L. Luvisetto E. Ugolini | |
| 3849 | 1992-03-12 | A Fast Analog–to–Digital Readout for Microstirp Detectors | 1992 | INFN-AE_92-11.pdf | M. Caccia P. Guazzoni W. Kucewicz C. Meroni G.F. Taiocchi G. Gegni L. Zetta | |
| 3882 | 1992-03-09 | A Digital Processor for Nuclear Spectroscopy with Cryogenic Detectors | 1992 | INFN-TC_92-4.pdf | E. Cosulich F. Gatti | |
| 5692 | 1992-03-09 | CASIMIR EFFECT FOR MOVING BODIES. | 1992 | INFN-AE-92-10.pdf | G. Calucci. | The usual presentation of the Casimir effect refers to the presence of forces between uncharged macroscopic bodies due to the vacuum fluctuations. If the macroscopic bodies are put in relative motion, the boundary conditions are continuously changed and this should lead to an emission of quanta out of the vacuum. The rate of emission is estimated in the simplest possible geometrical and kinematical situations,the effect is found to be easily calculable but very small because the macroscopic bodies are always extremely slow with respect to the speed of light. It is however possible that a resonant effect might enhance the process. |
| 455 | 1992-03-02 | NON COMPACT GAUGE THEORIES ON A LATTICE: THE CASE OF SCALING DIMENSION 2 FOR THE AUXILIARY FIELD | 1992 | LNF-92-014(P).pdf | C. M. BECCHI, F. PALUMBO | We investigate a new lattice regularization of gauge theories where gauge-invariance with non compact gauge fields is realizated by the help of auxiliary fields. For the gauge group SU(2) there is only one auxiliary field. We construct the complete action for scaling dimension 2 of this field. In this case the regularization ammounts to relax unitarity of the Wilson link variables, but has the same renormalization scale parameter showing the stability of Wilson's fixed point. |
| 434 | 1992-02-29 | La Progettazione Computerizzata del Circuito Stampato | 1992 | LNF-92-008(NT).pdf | D. Riondino | Le esigenze sempre piu' esasperate e le contunue evoluzioni dell'Elettronica hanno fatto in modo che la tecnica della Progettazione dei Circuiti Stampati subisse in questi ultimi dieci anni una trasformazione radicale, passando dalla lavorazione strettamente manuale a quella completamente automatica. La Progettazione Computerizzata dei Circuiti Stampati, pertanto, rappresenta oggi quanto di meglio la tecnologia possa offrire alle complesse esigenze dell'Elettronica. L'esasperata riduzione dello spazio, la continua lotta con il tempo verso l'apparato piu' sofisticato e la qualita' del prodotto finale richiedono un insieme di potenzialita' che solo un attrezzatura molto evoluta puo' avere. Computer e Software oggi permettono una egregia risoluzione di queste tre incompatibili richieste, consentendo un rapporto qualita'-prezzo talmente elevato che qualche anno fa era addirittura inconcepibile. Ed e' proprio sulla base di tali risultati e sulla consapevolezza che uno strumento del genere debba essere alla portata di tutti nell'ambito della Ricerca, si e' ritenuto opportuno creare un documento semplice e schematico sull'argomento. Pertanto tutti coloro che non hanno mai lavorato con strumenti di Progettazione Computerizzata, ma che comunque hanno una discreta conoscenza del sistema operativo delle Vax Station Digital, potranno, tramite questa pubblicazione, facilmente apprendere e molto rapidamente realizzare il proprio circuito. Inoltre nella convinzione che il metodo piu' stimolante ed efficace per l'apprendimento sia quello di dare una traccia chara e semplice del procedimento da seguire, si e' ritenuto opportuno, nei vari paragrafi, di mostrare in modo sequenziale tutto cio' che appare sul monitor, dal momento in cui si e' fatto partire il software fino alla completa realizzazione del circuito stampato. Si vuole inoltre sottolineare un particolare ringraziamento al Prof. Roumen Iltchev che con la sua squisita collaborazione ha permesso all'INFN di poter utilizzare ed apprezzare uno strumento cosi fondamentale per la Progettazione Elettronica. |
| 437 | 1992-02-27 | On Possible Strange Partners of the f2/AX Resonance | 1992 | LNF-92-013(P).pdf | C. Guaraldo, L. A. Kondratyuk, P. E. Volkovitsky | We consider the possibility of the existence of strange partners with hidden strangeness of the 2^++ I=0 resonance f_2/AX. These states exist if the f_2/AX is a qq\\overline{qq} state and cannot exist if it is a glueball or a \\overline{N}N bound state. We discuss also other members of the four-quark family which can be constructed from scalar diquarks. |
| 3847 | 1992-02-27 | Performances of Large Cathode Area Phototubes for Underground Physics Applications | 1992 | INFN-AE_92-9.pdf | G. Ranucci R. Cavalletti P. Inzani S. Schönert | |
| 453 | 1992-02-26 | INTERMEDIATE VECTOR MESON CONTRIBUTIONS TO V0->P0P0g DECAYS | 1992 | LNF-92-011(P).pdf | A. BRAMON, A. GRAU, G. PANCHERI | A contribution of intermediate vector mesons to the decays V^0 \\rightarrowP^0P^0\\gamma is calculated and compared with experimental upper limits, whenever available, and previous estimates. For some decays, like \\phi or \\omega\\rightarrow\\pi^0\\pi^0 our results update the existing numbers and suggest the feasibility of their experimental detection. For the decays \\phi\\rightarrow K^0\\overline{K}^0\\gamma and \\phi, \\omega\\rightarrow\\pi^0\\eta\\gamma, we find values different from the ones in the literature and discuss the origin of the discrepancy. |
| 454 | 1992-02-26 | THE STANDARD MODEL ON A PLANCK LATTICE: EMERGENCE OF THE anti tt- CONDENSATE AND DISAPPEARANCE OF THE HIGGS PARTICLE | 1992 | LNF-92-012(P).pdf | G. PREPARATA, SHE - SHENG - XUE | Motivated by the possibility that the violent fluctuations of quantum gravity at the Planck scale might endow space-time with a lattice structure with lattice constant a_p \\sim 10^-33 cm (the Planck lattice), we have reformulated the Standard Model (SM) on such lattice by adding Nambu-Iona Lasinio terms, quadrilinear in the Fermi fields, necessary to avoid the 'no-go' theorem of Nielsen and Ninomiya. We find that for certain values of the new Fermi-couplings a spontaneous violation of the SM chiral symmetry emerges which (i) avoids the 'no-go' theorem, (ii) produces a kind of \\overline{t}t condensate model, (iii) does not exhibit the low-energy scalar particle, that in the continuum \\overline{t}t-condensate surrogates the Higgs boson. |
| 436 | 1992-02-24 | Higgs and Top: Missing Links of the Standard Model | 1992 | LNF-92-010(R).pdf | G. Pancheri, Y. N. Srivastava | |
| 3875 | 1992-02-21 | Survival Probabilities for Random–Walks on Lattices with Randomly distributed Traps | 1992 | INFN-FM_92-1.pdf | E. Milotti | |
| 3881 | 1992-02-21 | Self–Pulsed Ion Beams Delivered by an XeCl Laser | 1992 | INFN-TC_92-3.pdf | A. Luches M. Martino V. Nassini A. Pecoraro | |
| 3844 | 1992-02-21 | Event Simulation and Reconstruction in Borexino | 1992 | INFN-AE_92-6.pdf | S. Bonetti I. Manno A. Preda U. Ullucci | |
| 3845 | 1992-02-21 | Search of Strange Quark Matter Using MACRO Detector | 1992 | INFN-AE_92-7.pdf | S. Petrera | |
| 3846 | 1992-02-21 | Multiple Muons and Primary Cosmic Composition Studies with MACRO | 1992 | INFN-AE_92-8.pdf | O. Palamara | |
| 3880 | 1992-02-18 | ULTRIX: Guida alla Gestione del Sistema | 1992 | INFN-TC_92-2.pdf | A.Bassi M.L.Luvisetto E. Ugolini | |
| 452 | 1992-02-14 | THE LVD TRACKING SYSTEM CHAMBERS | 1992 | LNF-92-007(IR).pdf | G. ANZIVINO Z. AFTAB, M. M. ALI, P. BENVENUTO, S. BIANCO, R. CASACCIA, K. CHEN, R. CHEN, S. CONG, X. CUI, H. DING, B. DULACH, D. FABBRI, F. L. FABBRI, B. GAO, M. GATTA, M. GIARDONI, J. LAAKSO+, Y. LI, L. LU, M. LINDOZZI, D. MENCARINI, B.K. MINHAS, E. PALLANTE, L. PASSAMONTI, V. RUSSO, S. SARWAR, G. SENSOLINI, Z. SHI, A.R. SHAH, Y. SUN, M. VENTURA, L. VOTANO, A. ZALLO and X. ZHOU; | |
| 451 | 1992-02-13 | ISOSPIN VIOLATION IN dd-p0+a | 1992 | LNF-92-006.pdf | G. PREPARATA, L. SATTA | |
| 433 | 1992-02-11 | A Flexible Light Guide as a Solution for the Read-Out of the Endcaps in KLOE Electromagnetic Calorimeter | 1992 | LNF-92-005(IR).pdf | P. Benvenuto, S. Bianco, R. Casaccia, D. Fabbri, F. L. Fabbri, S. Sarwar, L. Votano, A. Zallo | |
| 3879 | 1992-02-07 | Proposal for the Development of a Test Coil for ASTROMAG | 1992 | INFN-TC_92-1.pdf | P.Fabbricatore G.Gemme R.Musenich R.Parodi | |
| 5691 | 1992-02-03 | LIGHT TRANSPORT IN A FLEXIBLE LIQUID SCINTILLATOR FIBER. | 1992 | INFN-AE-92-4.pdf | G. Barbiellini, A. Martinis, R. Sangoi, F. Scuri. | <i>First results on attenuation length and photon yield of a liquid scintillator flexible fiber are presented. Possible applications and systematic effects are also discussed.</i> |
| 3843 | 1992-02-03 | KS,L KL,SÆ 3p, pln Interferences at f–Factories | 1992 | INFN-AE_92-5.pdf | G. D'Ambrosio N. Paver | |
| 431 | 1992-01-31 | La Rete APPLE dei LNF Problematiche progettuali e gestionali | 1992 | LNF-92-003(NT).pdf | O. Ciaffoni, M. Marsella | In this note we describe the current situstion of AppleTalk networks in the LNF. Local-and wide-area AppleTalk networks are presently available in the INFN; their services and management issues are described.Some traffic measurements are given with proposal for net numbering and zone naming. A brief overview is given about net-management products we have used. Our point of view about access control in AppleTalk networks is given. Migration to system 7.0 and related issues are discussed. |
| 3841 | 1992-01-22 | Hadronic Mass Spectra in a Unified Approach to Strong and Gravitational Interactions | 1992 | INFN-AE_92-3.pdf | E. Recami W.A. Rodrigues Jr. V.T. Zanchin P. Ammiraju L.A. Brasca–Annes J.A. Roversi | |
| 5690 | 1992-01-21 | HADRONIC BRANCHING FRACTIONS OF THE Z<sup><small>O</small></sup> BOSON. | 1992 | INFN-AE-92-2.pdf | A. De Angelis. | The techniques used for classifying the decays of the Z<sup><small>O</small></sup> into different quark flavours are reviewed. From a sample of <a href='https://www.codecogs.com/eqnedit.php?latex=\simeq' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\simeq' title='\simeq' /></a> 600,000 hadronic decays of the Z<sup><small>O</small></sup> boson, the analyses of the groups at SLC and LEP lead to the following results for the hadronic branching fractions: <a href='https://www.codecogs.com/eqnedit.php?latex=\begin{matrix}&space;\Gamma&space;_{u\bar{u}+d\bar{d}}/\Gamma&space;_{h}=&space;0.371\pm&space;0.057\\&space;\Gamma&space;_{s\bar{s}}/\Gamma&space;_{h}=&space;0.233\pm&space;0.053\\&space;\Gamma&space;_{c\bar{c}}/\Gamma&space;_{h}=&space;0.187\pm&space;0.018\\&space;\Gamma&space;_{b\bar{b}}/\Gamma&space;_{h}=&space;0.209\pm&space;0.009,&space;\end{matrix}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\begin{matrix}&space;\Gamma&space;_{u\bar{u}+d\bar{d}}/\Gamma&space;_{h}=&space;0.371\pm&space;0.057\\&space;\Gamma&space;_{s\bar{s}}/\Gamma&space;_{h}=&space;0.233\pm&space;0.053\\&space;\Gamma&space;_{c\bar{c}}/\Gamma&space;_{h}=&space;0.187\pm&space;0.018\\&space;\Gamma&space;_{b\bar{b}}/\Gamma&space;_{h}=&space;0.209\pm&space;0.009,&space;\end{matrix}' title='\begin{matrix} \Gamma _{u\bar{u}+d\bar{d}}/\Gamma _{h}= 0.371\pm 0.057\\ \Gamma _{s\bar{s}}/\Gamma _{h}= 0.233\pm 0.053\\ \Gamma _{c\bar{c}}/\Gamma _{h}= 0.187\pm 0.018\\ \Gamma _{b\bar{b}}/\Gamma _{h}= 0.209\pm 0.009, \end{matrix}' /></a> consistent with the predictions from the Standard Model. Inside the Peterson fragmentation scheme, the values <a href='https://www.codecogs.com/eqnedit.php?latex=\epsilon&space;_{b}=&space;1.7_{-1.0}^{+1.3}10^{-3};\epsilon&space;_{c}=&space;25_{-10}^{+15}10^{-3}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\epsilon&space;_{b}=&space;1.7_{-1.0}^{+1.3}10^{-3};\epsilon&space;_{c}=&space;25_{-10}^{+15}10^{-3}' title='\epsilon _{b}= 1.7_{-1.0}^{+1.3}10^{-3};\epsilon _{c}= 25_{-10}^{+15}10^{-3}' /></a> are derived for the fragmentation parameters of <i>b</i> and <i>c</i> quarks. |
| 430 | 1992-01-15 | Fermion Masses from the Planck Mass | 1992 | LNF-92-002(R).pdf | G. Preparata, She - Sheng - Xue | The 'no-go' theorem of Nielsen and Ninomiya, forbidding a sensible formulation of the usual electroweak action on a lattice, has been revised proceeding from the hypothesis that space-time, as a result of the dynamics of quantum gravity, is a four-dimensional random lattice with constant a_p, the Planck length. We find that a sensible electroweak theory at long wave-lengths is recovered by adding a chiral-gauge-invariant quadrilinear fermionic term. Dynamical symmetry breaking of Nambu-Jona-Lasinio (NJL) type is shown to be crucial for making contact with known phenomenology. The relation of this approach to similar recent proposal is briefly discussed. |
| 450 | 1992-01-14 | XRF ANALYSIS OF VOLCANIC ASH USING SYNCHROTRON RADIATION | 1992 | LNF-92-001(IR).pdf | E. BURATTINI, A. RIVEROS, M. RUBIO, H. J. SANCHEZ, R. SARTORI | XRF quantitative analyses of volcanic ash were carried out in the Mycroanalysis ststion of the PWA Group of the Frascati National Laboratories. Very accurate and interesting results were obtained using a conventional XRF arrangement. These results are confronted with the ones obtained by mean of Chemical Analysis in a different laboratory. Qualitative analyses using a total-reflection setup were performed obtaining optimal spectra and precise determination of new elements present in the samples. |
| 4327 | 1992-01-13 | Integrable System in Topological Field Theory | 1992 | INFN-AE_92-1.pdf | B. Dubrovin | |
| 432 | 1992-00-00 | Structural Study of a-Si1-xCx:H by EXAFS and X-ray Scattering | 1992 | LNF-92-004.pdf | C. Meneghini, S. Pascarelli, F. Boscherini, S. Mobilio, F. Evangelisti | We present a comprehensive study of short range order in a-Si_1-xCx:H using X-ray scattering and Si K-edge EXAFS. The X-ray scattering probes the total radial distribution function; by detailed fitting in R-space we measure short range order parameters around C and Si for the first and second shell. The C-C distances in first and second shell indicate that both carbidic and graphitic configurations are present. The coordination numbers indicate that there is a tendency to chemical order; at high C concentrations there is evidence for chemical order with phase separation. The EXAFS measurements probe local order in the Si-C alloy phase; there is clear evidence that even this phase is chemically ordered. |
| 435 | 1992-00-00 | Conceptual Design of a Synchrotron Radiation Source Dedicated to X-Ray Lithography | 1992 | LNF-92-009.pdf | M. Bassetti, E. Bernieri, E. Burattini, A. Cattoni, V. Chimenti, C. Sanelli, S. Tazzari, F. Tazzioli, C. Mencuccini, L. Palumbo, L. Picardi, R. Rinzivillo, K. Shixiu | The design of a synchrotron radiation source dedicated to X-ray lithography is presented. The parameter optimization carried out is based on the lithography requirements, on the radiation spectrum and beam source sizes, and on the machine performances, such as long lifetime, absence of beam instabilities and reliable operation at design current. High-field conventional magnets are proposed for the radiation production |
| 438 | 1992-00-00 | Theoretical Analysis of X-ray Absorption Near-Edge Structure at the Sr K Edge in La2-xSrxCuO4 Compounds | 1992 | LNF-92-015.pdf | Z. Y. Wu, M. Benfatto, C. R. Natoli | We present a theoretical analysis of x-ray-absorption near-edge structure at the Sr K edge in La_2-xSr_xCuO_4 and SrF_2 compounds based on the experimental results of Tan et al. [Phys. Rev. Lett. 64, 2715 (1990)]. Contrary to the suggestion put forward in this investigation which is based on the observation of a certain absorption structure, we obtain the best agreement with experimental data when the environment of the dopant Sr atom is kept fixed in its crystallographic arrangement. |
| 456 | 1992-00-00 | MACRO-MODELS OF ACCELERATORS AND RINGS TO COMMISSION AND OPERATE | 1992 | LNF-92-016.pdf | L. CATANI, G. DI PIRRO, C. MILARDI, A. STECCHI, L. TRASATTI, M. J. LEE | MARCO is a knoledge-based user interface for commissioning and operating modern accelerators and storage rings. Its purpose is to provide a model-referenced graphical interface system between the users and the machine. It allows access to modeling and simulation codes that are used in the design of the machine. It can be used to predict the effects of a change of parameters on the beam, or to compare the predicted with the measured effects. The design and prototype developement of MARCO using HyperCard will be described in this paper. |
| 441 | 1992-00-00 | Short-Range Order in Hydrogenated Amorphous Si-C Alloys Studied BY EXTENDED X-RAY ABSORPTION FINE STRUCTURE | 1992 | LNF-92-028.pdf | S. Pascarelli, F. Boscherini, S. Mobilio, F. Evangelisti | The local structure of hydrogenated amorphous Si-C alloy films, a-Si_1-x C_x:H, has been studied by measuring the extended X-ray absorption fine structure at the Si K edge. The first-coordination-shell average bond lengths are found to be 2.35 A for Si-Si and 1.86 A for Si-C and are constant with concentration to within +- 0.015 A. By comparing the composition of the first coordination shell around silicon with the average concentration, it is shown that the alloy tends to be chemically ordered, in that heteroatomic bonds are preferred. |
| 474 | 1992-00-00 | THE SYNCHROTRON RADIATION FACILITY AT FRASCATI | 1992 | LNF-92-38.pdf | R. Cimino, E. Burattini, S. Mobilio | In this paper we give a brief description of the Synchrotron Radiation Facility at Frascati. Particular emphasis is given in describing the most significant instrument developments during the last few years. |
| 475 | 1992-00-00 | DISPERSIVE EXAFS APPARATUS AT FRASCATI | 1992 | LNF-92-039.pdf | F. D' ACAPITO, F. BOSCHERINI, A. MARCELLI, S. MOBILIO | We report the successful design and test of a dispersive extended x-ray absorption fine structure (EXAFS) apparatus at Frascati. This technique is capable of measuring x-ray absorption spectra in fractions of a second and makes time-resolved structural studies possible. We describe the design of the instrument and compare the experimental performance with theoretical predictions. An energy resolution of 2-3 X 10^-4, an energy dispersion ranging from 350 to 870 eV (at 7 to 11 KeV), a spot size between 0.5 to 1 mm, and a flux of the order of 10^6 photons/s/pixel/100 mA was achieved. EXAFS spectra with good signal-to-noise ratio can be obtained in 100 to 600 ms on concentrated samples. |
| 476 | 1992-00-00 | X-RAY MAMMOGRAPHY WITH SYNCHROTRON RADIATION | 1992 | LNF-92-040.pdf | E. BURATTINI, M. GAMBACCINI, M. MARZIANI, O. RIMONDI, P. L. INDOVINA, M. POCEK, G. SIMONETTI, M. BENASSI, C. TIRELLI, R. PASSARIELLO | For the first time in the literature, radiographs of breast phantoms were obtained using several monochromatic synchrotron radiation x-ray beams of selected energy in the range from 14 to 26 KeV. In addition, after optimization of the photon energy as a function of the phantom thickness, several mammographs were obtained on surgically removed human breast speciments containing cancer nodules. Comparison between radiographs using a conventional x-ray unit and those obtained of the same specimens utilizing synchrotron monochromatic beams clearly shows that higher contrast and better resolution can be achieved with synchrotron radiation. These results demonstrate the possibility of obtaining radiographs of excises human breast tissue containing a greater amount of radiological information using synchrotron radiation. |
| 477 | 1992-00-00 | THE HIGH-RESOLUTION POWDER DIFFRACTION STATION PO DI STA IS 'RUNNING' AT ADONE | 1992 | LNF-92-041.pdf | E. BURATTINI, S. SIMEONI, G. CAPPUCCIO, P. MAISTRELLI | At the end of February 1991, a 'triple-axis' high-resolution diffractometer for on powder sample measurements with synchrotron radiation was put in operation on the Adone wiggler line BX1 at Frascati. The diffractometer is based on a Seifert goniometer, designed according to our specifications. During the project, particular attention was paid in assuring the highest reliability together with great flexibility in the use. In fact, the diffractometer can also be used in a 'medium resolution' configuration. For preliminary alignment and data collection, it is possible to operate with a traditional x-ray tube, too. The alignment procedure of the diffractometer to the x-ray beam is very easy. Powder samples can be measured both on the flat holder and on the capillary. An IBM PC computer is used for the instrument actuation and preliminary on-line data collection, while a large software package has been developed for the data analysis performed by a Macintosh IIcx. The instrument performance has been tested with a standard Si sample and quartz and Ni oxide samples. For the two possible resolution configurations, a test on a NiO sample gave FWHM values of 0.16^o and 0.04^o, respectively, for the [012] peak. |
| 569 | 1991-12-21 | APPLICATION of IMPROVED AREA DETECTOR FOR CONTINUOUS SMALL ANGLE X-RAY SCATTERING USING SYNCHROTRON RADIATION | 1991 | LNF-91-090.pdf | A. LA MONACA, M. BARTERI, E. BORGHI, A. CONGIU - CASTELLANO, G. CAPPUCCIO, M. BELTRAMINI, A. SALVATO, J. S. SHAH | Continuous small angle X-ray scttering experiments were performed on high molecular weight proteins, hemocyanins and tranferrins, with the Frascati drift chamber area detector and the diffraction camera. The detector used the time structure of Adone synchrotron radiation for operating a faster data acquisition system with real time graphics for monitoring and interpreting scattering data. The diffraction camera with the relative angular resolution \\Deltak/k of 0.12 could measure a minimum scattering momentum k_mm of 8x10^-3 A^-1. Preliminary results obtained on lyophilized half-met hemocyanin and trasferrins indicate formation of clusters. Small angle X-ray scattering data on the native hemocyanin is an agreement with the model (a hollow cylinder) derived from electron microscopy. |
| 568 | 1991-12-20 | THE FRASCATI PROGRAM FOR MEASURING THE TOTAL PHOTONUCLEAR CROSS SECTION IN THE NUCLEON RESONANCE REGION | 1991 | LNF-91-089(IR).pdf | M. ANGHINOLFI, N. BIANCHI, P. CORVISIERO, A. DEPPMAN, E. DE SANCTIS, A. EBOLESE, A. FANTONI, G. GERVINO, P. LEVI - SANDRI, V. LUCHERINI, L. MAZZASCHI, V. MOKEEV, V. MUCCIFORA, E. POLLI, A.R. REOLON, G. RICCO, M. RIPANI, P. ROSSI, M. SANZONE, M. TAIUTI, A. ZUCCHIATTI | We present the research studies on the total photonuclear absorption carried on at Frascati between 200 and 1200 MeV, to obtain information on the interaction of baryon resonances with nucleons and on the possible onset of the shadowing effect. The preliminary results on Be and C obtained using the trasmission technique and the Jet Target tagged photon beam are presented in this paper. |
| 3839 | 1991-12-20 | A RF-LINAC, FEL Based Drive Beam Injector for CLIC | 1991 | INFN-TC_91-15.pdf | W.A. Barletta R. Bonifacio | |
| 5689 | 1991-12-20 | SYMMETRIES OF THE CLASSICAL PATH INTEGRAL ON A GENERALIZED PHASE SPACE MANIFOLD. | 1991 | INFN-AE-91-22.pdf | E. Gozzi, M. Reuter, W.D. Thacker. | In this paper we generalize previous work done on the path-integral approach to classical mechanics and its symmetries. We study in particular the case that the components of the symplectic 2-form <a href='https://www.codecogs.com/eqnedit.php?latex=\omega&space;_{ab}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\omega&space;_{ab}' title='\omega _{ab}' /></a>, expressed in arbitrary coordinates, are allowed to depend on the phase space coordinates. This lifts the restriction that the path-integral and its symmetry generators be only expressed in terms of canonical coordinates. We show, in particular, that an extra term must be added to the anti-BRS charge in order to preserve the <i>ISp</i>(2) symmetry which reflects the geometry of phase space. The cohomology of this new anti-BRS operator is found to be isomorphic to the de Rham cohomology of phase space. The modification of the anti-BRS charge leads to a modification of one of the supersymmetry generators associated with the classical Hamiltonian. Despite this change in the form of the generators, the classical KMS conditions can still be derived from this supersymmetry. We also prove that the requirement of supersymmetric invariance of the states results in a new set of equations that, despite their new form, are still satisfied by the Gibbs states on a general phase space manifold. |
| 3833 | 1991-12-20 | The TRIGA Board for a Fast Muon Trigger for E771 | 1991 | INFN-TC_91-9.pdf | L. Antoniazzi G. Introzzi G. Liguori R. Nardò P. Torre | |
| 3812 | 1991-12-16 | A Collection of Data on Resonances in Heavy–Ion Reaction | 1991 | INFN-BE_91-11.pdf | U.Abbondanno | |
| 3838 | 1991-12-16 | Introduzione all'Uso del Vax Cluster della Sezione INFN di Trieste | 1991 | INFN-TC_91-14.pdf | A. Mansutti C. Strizzolo | |
| 3837 | 1991-12-13 | Metal–Photo Cathode Electron Source Switched by an XeCl | 1991 | INFN-TC_91-13.pdf | V. Nassini C. Padula A. Pecoraro | |
| 3810 | 1991-12-10 | Tests of QCD at LEP | 1991 | INFN-AE_91-21.pdf | Milano | |
| 632 | 1991-12-09 | WAVINESS EFFECTS IN RAY TRACING OF 'REAL' OPTICAL SURFACES | 1991 | LNF-91-088(P).pdf | M. SANCHEZ - DEL - RIO, A. MARCELLI | Today ray-tracking calculations are playing an essential role in the design of synchrotron radiation beamlines. In particular, for the new generation of synchrotron radiation machines that will produce high brightness x-ray beams, the low emittance must be conserved along the beamline by choosing the best optical design. Quality of optical elements are limited by the technological manifacturing process, characterized by the values of roughness and waviness of the optical surfaces. Therefore a reliable description of an optical element is essential for having accurace results in ray-tracing simulations. We present here a model for introducing the waviness effect of real optics surfaces in ray-tracing calculations and also show some examples of simulated surfaces in comparison with real measured surfaces. |
| 567 | 1991-12-02 | REALIZZAZIONE DI UN APPARATO PER LA RIVELAZIONE DI SPETTRI XAFS IN FLUORESCENZA CON RADIAZIONE DI SINCROTRONE | 1991 | LNF-91-085(IR).pdf | L. PALLADINO, A. REALE, A. BALERNA, E. BERNIERI, H. SANCHEZ | Uno dei principali vantaggi della spettroscopia a raggi X e' la sua applicabilita' indipendentemente dallo stato fisico-chimico delle sostanze in studio: i materiali possono essere cristalli, solidi amorfi o soluzioni. E' noto che lo XAFS (\\underline{X}-ray \\underline {A}bsorption \\underline{F}ine \\underline{S}tructures) in fluorescenza e' l'unica tecnica che consente lo studio di alcuni tipi di campioni, in situazioni di alta diluizione, con condizioni accettabili di rapporto S/N. In campo biologico, in particolare, dove piccole concentrazioni di metalli giocano un ruolo strutturale fondamentale, questa tecnica e' l'unica capace di fornire informazioni del sito chimico grazie alla sua elevata sensibilita'. L'applicazione di questa tecnica e' leggermente piu' complessa della usuale tecnica di misura dello XAFS in trasmissione. In questo lavoro, dopo una breve presentazione dello XAFS ed una descrizione delle tecniche di rivelazione, sono discussi alcuni problemi specifici della fluorescenza, sono ricavate le condizioni ottimali di operazione in alcuni casi particolari e valutate le situazioni in cui la fluorescenza e' preferibile alla trasmissione. Infine viene descritto l'apparato sperimentale per misure in fluorescenza con radiazione di sincrotrone che e' stato installato sulla linea BX@S della Facility Wiggler di Frascati, il software elaborato per la gestione dell'apparato e la calibrazione di tutto il sistema e vengono discussi alcuni degli spettri raccolti. |
| 630 | 1991-12-02 | CONDENSATE OF ABELIAN MONOPOLES AND CONFINEMENT IN LATTICE GAUGE THEORIES | 1991 | LNF-91-086(P).pdf | T. L. IVANENKO, A. V. POCHINSKY, M. I. POLIKARPOV | We show that the confining phase of the SU(2) lattice gauge theory the condensate of abelian magnetic monopoles exists. This condensate vanishes at the critical temperature or (on a symmetric lattice) at the cooling step where the string tension vanishes. These results seem to confirm the confinement mechanism based on the model of the dual superconductor. As a justification of our definition of the monopole condensate we study the U(1) lattice gauge theory. |
| 631 | 1991-12-02 | SEARCH FOR NEUTRON EMISSION FROM DEUTERIDED HIGH TEMPERATURE SUPERCONDUCTORS IN A VERY LOW BACKGROUND ENVIRONMENT(+) | 1991 | LNF-91-087(R).pdf | F. CELANI, A. SPALLONE, L. LIBERATORI, F. CROCE, L. STORELLI, S. FORTUNATI, M. TULUI, N. SPARVIERI | Following the experiments performed with deuterium High Temperature SuperConductors (HTSC) at underground Gran Sasso Laboratory, we have learnt the capacity to absorb Deuterium (D) by these materials and the role played by non-equilibrium conditions to get neutron burst emissions in the framework of Cold Fusion. So far, some Y_1Ba_2Cu_3O_7-\\delta (YBCO) pellets and high pressure D_2 gas were enclosed in a stainless steel vessel and a charging-up procedure was performed. The vessl was put in a thermal neutrons field and some thermal cycles (300\\rightarrow 77\\rightarrow 300 K) were performed; moreover, for comparison, background and black runs were performed. A secific acuisition system, able to detect multiple neutron signals in defined time-windows ('time-correlated events'), was set-up. One thermal cycle run shower a large increase of time-correlated events in respect to the blanks; one other run, although with no relevant mean-value increase of events detected, showed, on the other hand, one interesting multiple neutron signal (triple); other similar runsproduced no relevant values. One-other kind of experiment, at constant temperature (300 K), characterized by a heavy D_2 gas refill, showed both some increase of time-correlated events and few 'triple' neutron signals. |
| 3836 | 1991-12-01 | A Very Efficient FEL for the Microwave Source Feltorn | 1991 | INFN-TC_91-12.pdf | I. Boscolo | |
| 565 | 1991-11-29 | DAFNE-L PROPOSTA PER L'UTILIZZAZIONE DI DAFNE COME SORGENTE DI LUCE DI SINCROTRONE | 1991 | LNF-91-083(IR).pdf | A. BALERNA, M. BENFATTO, E. BERNIERI, F. BOSCHERINI, E. BURATTINI, R. CIMINO, A. MARCELLI, C. MENCUCCINI, S. MOBILIO, C. NATOLI, L. PALUMBO, G. VIGNOLA | |
| 566 | 1991-11-29 | STUDY OF LOCAL ENVIRONMENT AROUND TUNGSTEN IN MIXED VALENCE BARIUM-TUNGSTEN-PHOSPHATE GLASSES BY X-RAY ABSORPTION SPECTROSCOPY | 1991 | LNF-91-084(IR).pdf | A. BALERNA, E. BERNIERI, E. BURATTINI, A. KUZMIN, J. PURANS | The XANES and the EXAFS of the L_1- and L_3- edges of tungsten in BaO-P_2O_5-WO_3 glasses and amorphous thin films a-WO_3 were studied using Synchrotron radiation. The sets of distances were obtained in the first and the second coordination spheres of tungsten by a least square technique. It was found, that in all glasses tungsten atoms have strongly distorted oxygen octahedra, which are joined by vertices. |
| 3835 | 1991-11-25 | A Preliminary Study on Te Intestinal Absorption with Stable Tracers | 1991 | INFN-TC_91-11.pdf | A. Giussani M.C. Cantone D. de Bartolo N. Molho L. Pirola G.Gambarini Ch. Hansen P. Roth E. Werner | |
| 629 | 1991-11-22 | MEASUREMENTS IN THE GRAN SASSO LABORATORY: EVIDENCE FOR NUCLEAR EFFECTS IN ELECTROLYSIS WITH Pd/Ti AND IN DIFFERENT TESTS WITH DEUTERATED HIGH TEMPERATURE SUPERCONDUCTORS | 1991 | LNF-91-082(R).pdf | F. CELANI, A. SPALLONE, L. LIBERATORI, B. STELLA, F. FERRAROTTO, M. CORRADI, P. MARINI, S. FORTUNATI, M. TULUI | Several experiments were performed at the INFN Underground Gran Sasso Laboratory (Italy) in order to detect nuclear signals, if any, coming from deuterated materials in the framework of so called 'Cold Fusion'. We followed three, quite different, lines of experimental researches. In the first set of experiments we used electrolytic solutions of heavy water and 0.1 M LiOH with some addition of gasseous CO_2, using as cathode a rod of pure Pd or Ti alloys and as anode a Pt net. We detected several intense bursts of gamma rays, lusting up to 15 minutes of duration time, with energy less than 300 KeV. In the second set of experiments we used pellets of sintered High Temperature Superconductors (HTSC) that underwent deuteration by high pressure (\\sim 30 Bar) and temperature (\\sim 370K) gas loading procedure. The deuterated samples were several times cycled down to liquid nitrogen temperature and we detected by two indipendent ^3He moderated neutron detectors (1.2% total efficiency), sporadic emission of signals mainly during these thermal cycles. Later on similar tests were performed independently by S.E. Jones and collaborators (provo Univ., Utah) in a deep underground mine and a very intense and short neutron burst was detected by 16 independent ^3He moderated neutron detectors (32% efficiency). In the third set of experiments some additional tests were performed using a low activity Am-Be neutron source, in order to study possible phenomena of enhanced neutron emission by radiation stimulation in these HTSC deuterated compounds. We detected excess counts of 2 statistic standard deviations, pointing to increased D-D cross section due to the effect of ceramic lattice. |
| 5687 | 1991-11-21 | ON THE TODA CRITERION. | 1991 | INFN-AE-91-19.pdf | E. Gozzi, M. Reuter, W.D. Thacker. | Using the path-integral formulation of <i>classical</i> mechanics, we present a further study of the Toda Criterion. This is an <i>approzimate</i> criterion to detect local transitions from ordered to stochastic/ergodic motion or viceversa. We analyze the criterion by studying those minima of the classical path-integral weight that are not invariant under a <i>universal</i> supersymmetry present in any classical Hamiltonian system. This analysis relies on a theorem, that we previously proved, which says that systems which are in a phase with this supersymmetry un-broken are also in the ergodic phase, while systems which are in a phase characterized by ordered motion always have, in that phase, the supersymmetry broken. This study confirms that the Toda Criterion is neither a sufficient nor a necessary condition for the transition from ordered to stochastic motion. In the conclusions some ideas are put forward to find a true criterion based on our supersymmetry. |
| 5688 | 1991-11-21 | STOCHASTIC AND NON STOCHASTIC SUPERSYMMETRY. | 1991 | INFN-AE-91-20.pdf | E. Gozzi. | In this paper we review the supersymmetries discovered some time ago both in Langevin equations and in Hamilton's canonical equations. Of these two supersymmetries we mainly study the <i>physical</i> origins. For the Langevin supersymmetry (the stochastic one) we find its origin in the <i>Onsager principle of microreversibility</i>, while for the Hamilton's supersymmetry (the non-stochastic one) we find its origin in the geometry of the energy surfaces in phase-space. Of this second supersymmetry we also point out its connection with <i>ergodicity</i>. In the conclusions we speculate on the existence of a universal supersymmetry present in any quantum system and related to the <i>'quantum' exterior derivative</i> on the energy manifolds. |
| 564 | 1991-11-20 | VALUTAZIONI DOSIMETRICHE RELATIVE ALL'ATTIVAZIONE DELL'ARIA DURANTE IL FUNZIONAMENTO DELL'ACCELERATORE LISA | 1991 | LNF-91-081(IR).pdf | E. D' AURIZIO, F. DESIATO, A. ESPOSITO, A. FERRARI, M. PELLICCIONI | |
| 627 | 1991-11-14 | STATUS AND PROSPECT OF HIGH ENERGY HEAVY ION PHYSICS IN EUROPE | 1991 | LNF-91-079(IR).pdf | J. P. BLAIZOT, J. CUGNON, C. GERSCHEL, C. GUARALDO, H. GUTBROD, V. RUUSKANEN, H. SATZ, J. SCHUKRAFT | The Nuclear Physics European Collaboration Committee (NuPECC) intends to present shortly a Report on 'The future of Nuclear Physics in Europe'. To this end NuPECC has formed working groups to prepare reports on the different areas of Nuclear Physics; these were presented at the NuPECC Workshop at Ruthin Castle (U.K.), on 17-21 March, 1991. This survey is based on the report of the Working Group on Quark-Gluon Plasma, and on numerous suggestions made by the community active in the field. It is presented by the members of the Working Group on QGP, but does not necessarily represent the view of NuPECC. The physics motivations for ultrarelativistic heavy ion experiments are recalled and the predictions of equilibrium thermodynamics based on statistical QCD are discussed. We examine what we have learned from experiments, and what nuclear effects have been observed. Finally, a review of existing and planned facilities is given, together with an assessment of how to adequate they are to answer questions about the formation and the properties of strongly interacting bulk matter, the quark-hadron phase transition and the quark-gluon plasma. |
| 628 | 1991-11-14 | INTERMEDIATE ENERGY ANTIPROTON-NUCLEUS REACTIONS TO TEST QUANTUM CHROMODYNAMICS | 1991 | LNF-91-080(R).pdf | C. GUARALDO | |
| 5686 | 1991-11-13 | ANALYTICAL EXPRESSIONS FOR THE STRONG-FIELD DEPENDENCE OF THE EFFECTIVE FINE STRUCTURE CONSTANT. | 1991 | INFN-AE-91-18.pdf | R. Ragazzon. | We provide analytical and non penurbative expressions for the effective coupling constant of QED in the presence of slowly-varying background fields. Our results agree with previous numerical calculations but, for strong magnetic fields, we observe some deviations from the expected logarithmic increase of the fine structure constant. These effects tend to reduce the effective charge, thereby providing further evidence against the existence of a new, strong-coupling phase of QED in heavy-ion collisions. |
| 3834 | 1991-11-07 | A New Scheme for Critical Current Measurements of Straight Superconducting Cables in aLarge Solenoid | 1991 | INFN-TC_91-10.pdf | L. Rossi G. Volpini | |
| 563 | 1991-11-06 | ADVANCED SMALL-ANGLE X-RAY SYNCHROTRON RADIATION SCATTERING STUDY OF HEMOCYANIN OLIGOMERS USING A HIGH-PERFORMANCE TWO-DIMENSIONAL DETECTOR | 1991 | LNF-91-077.pdf | A. LA MONACA, M. BARTIERI, E. BORGHI, M. BELTRAMINI, B. SALVATO, A. CONGIU - CASTELLANO, J. S. SHAH | Structural parameters of lyophilized hemocyanin oligomers from Octopus vulgaris have been obtained by continuous small-angle X-ray scattering experiments using a high-performance area detector realized at Frascati Laboratories on an Adone wiggler beam line. The new apparatus allowed fast collection of two-dimensional diffraction patterns and showed in real-time graphic display both the presence of different scattering units with superparticles of very high molecular weight and the anisotropic effects. The results of the experiments on lyophilized half-met hemocyanin derivative have stressed the fundamental presence of the 195 fraction. |
| 626 | 1991-11-06 | THE FRASCATI F-FACTORY DAFNE | 1991 | LNF-91-078(R).pdf | A. ZALLO | The physics items that can be studied at the Frascati \\Phi factory DAPHNE are reviewed. The design of DAPHNE has the potential to increase by an order of magnitude the sensitivity in detecting CP violating processed. Detailed studies of Kaon mesons physics and tests of Chiral perturbation theory can be done. Kaon-nucleus interactions at very low energies, hypernuclei formation with stopped Kaons can also be studied at DAPHNE, showing the possibility to accompish aslo a large nuclear program. |
| 624 | 1991-11-05 | XANES STUDIES OF Me03-x (Me= W, Re Ir) CRYSTALLINE AND AMORPHOUS OXIDES | 1991 | LNF-91-075.pdf | A. BALERNA, E. BERNIERI, E. BURATTINI, A. KUZMIN, A. LUSIS, J. PURANS and P. CIKMACH | X-ray absorption near-edge spectroscopy (XANES) of the L_1- and L_3- edges of transition metals (W, Re, Ir) oxides has been studied in the 'ADONE' synchrotron source. The distorsion of oxygen polyedra and the metal valence state correlate with the amplitude of the pre-edge peak in L_1- spectra and the 'white line' in L_3- spectra. |
| 625 | 1991-11-05 | X-RAY DIFFRACTION AND CONTINOUS SMALL-ANGLE SCATTERING OF TURKEY TENDONS WITH THE IMPROVED AREA DETECTOR AT FRASCATI | 1991 | LNF-91-076.pdf | A. LA MONACA, J. S. SHAH, A. BIGI, N. ROVERI | Low-angle diffraction experiments with turkey tendons were carried out with the Frascati drift-chamber area detector and diffraction camera. A fast CAMAC-VME-Macintosh IIx data acquisition system provided real-time graphics for monitoring and interpreting scattering and diffraction data. Results obtained on uncalcified turkey tendons show unfolding of crimps with tensile stretching. These results confirm the significance of crimps with respect to in vivo mechanical functions of these tissues. Results of continuous small-angle scattering in calcified turkey tendons and other substances are interpreted in terms of their structural anisotropy. |
| 623 | 1991-11-04 | A PB-SCIFI E.M. CALORIMETER FOR AN EXPERIMENT ON CP VIOLATION AT DAFNE | 1991 | LNF-91-073(R).pdf | A. ANTONELLI, S. BERTOLUCCI, S. BIANCO, C. BLOISE, F. BOSSI, P. CAMPANA, R. CASACCIA, M. CORDELLI, M. CURATOLO, B. ESPOSITO, F. L. FABBRI, S. MISCETTI, F. MURTAS, G. NICOLETTI, V. PATERA, S. SARWAR, L. VOTANO, A. ZALLO | A proposal for a PB-SCIFI sampling calorimeter for an experiment at the \\Phi Factory DAPHNE is reported. The design closely matches the experiment requirements. The results on timing and energy resolutions obtained with prototypes are presented. |
| 562 | 1991-11-04 | CHIRAL SYMMETRY AND PION POLARIZABILITIES | 1991 | LNF-91-074(P).pdf | D. BABUSCI, S. BELLUCCI, G. GIORDANO, G. MATONE, A. M. SANDORFI, M. A. MOINESTER | We use chiral perturbation theory including 1-loop contributions to derive formulae needed to deduce pion polarizabilities from \\gamma\\pi\\rightarrow\\gamma\\pi and \\gamma\\gamma\\rightarrow\\pi\\pi data. We deduce for the first time values for the \\pi^+- and \\pi^0 polarizabilities from \\pi\\pi production data, and compare these new results to chiral symmetry predictions. |
| 622 | 1991-10-30 | SOME PROBLEMS OF MESON SPECTROSCOPY. POSSIBLE SOLUTIONS AT DAFNE | 1991 | LNF-91-072(R).pdf | P. E. VOLKOVITSKY | The e+e- collider with luminosity of the order of 10^32 - 10 ^33 cm^-2 s^-1 in the energy range \\sqrt{s} = 1-2 GeV is a very good facility to study hadron physics, We discuss here some problems of meson spectroscopy, namely the problem of radial and orbital vector meson excitations and their electromagnetic widths, the two particle decays of vector mesons and the level structure of P-wave meson multiplets. In the first two cases one can study the vector mesons produced in s-channel. In the last case the study of radiative decays of \\rho (1700) meson into P-wave states gives a possibility to discriminate between different candidates for P-wave multiplet members. |
| 619 | 1991-10-28 | SUPERCONDUCTING PROPERTIES OF Nb.75 Zr.25-OXIDE-Nb75 Zr.25 TUNNEL JUNCTIONS | 1991 | LNF-91-069(P).pdf | U. GAMBARDELLA, D. DI GIOACCHINO, G. PATERNO', M. CIRILLO | We have fabricated symmetrical Nb_.75Zr_.25/Oxide/Nb_.75Zr_.25 tunnel junctions having cross type geometry. The superconducting films constituing the electrodes of the junctions were obtained by RF magnetron sputtering and the tunnel barrier was grown by natural oxidization in air. From the current-voltage characteristics of the junctions we have measured the temperature dependence of the energy gap of Nb_.75Zr_.25 and compared this dependence with BCS-theory results. The magnetic field diffraction pattern of the Josephson current of the junctions allows us to evaluate the penetration depth of the superconducting films. We also estimate the surface impedance of the NbZr film by measuring the quality factor of the junctions. We discuss the results within the framework of the realization of superconducting tunnel devces and coatings for superconducting accelerating cavities. |
| 620 | 1991-10-28 | CP VIOLATION AT DAFNE, THE FRASCATI F FACTORY | 1991 | LNF-91-070(R).pdf | A. CALCATERRA | The e+e- collider DAPHNE, expected to begin commissioning in Frascati by the late 1995, is a two-ring machine optimized to run with maximum luminosity at the peak of the \\phi meson, corresponding to a total energy of 1020 MeV/C in the center of mass. This choise for the total energy is motivated by the most important (although by no means the only important) issue in the DAPHNE physics program: the study of the pattern and entity of CP violation in the decay of the \\phi to a final K\\overline{K} pair: the \\phi meson is a pure laboratory for the production of coherent K\\overline{K} states, which makes possible to perform a variety of tests and measurements which have no counterpart for the 'normal' K-or-\\overline{K} production at hadron machines. The whole DAPHNE project poses a number of very hard problems to almost every component of a high-energy physics experiment: from the machine, designed to deliver a luminosity L \\sim 10^32cm^-2 s^-1 shortly after turn-on, to the detector which will have to be able, for the first time in the history of e+e- apparata, to reconstruct with high accuracy the decays of long-lived particles like the K+- and K^0, to the data acquisition system which will be confronted with a 'physics' trigger rate of \\sim 10 KHz. In what follows, I will very skechily describe the machine, already illustrated in much detail in the nice contribution of S. Guiducci to these Proceedings, and will concentrate on the list of physics topics to be addressed, and on the demands imposed to the detector by the characteristics of the events and by the smallness of the effects to be measured. |
| 621 | 1991-10-28 | CHIRAL PERTURBATION THEORY AND VECTOR MESONS IN e+e- ->p0 \\gamma AND p0 1+1- | 1991 | LNF-91-071(P).pdf | A. BRAMON, G. GRAU, G. PANCHERI | The low-energy cross-section for e+e- \\rightarrow\\pi^0\\gamma is predicted in Chpt at next-to-leading order and the saturation of its counter-terms by vector-meson resonances is confirmed. Further details on this saturation by vector-mesons are discussed for e+e- \\rightarrow\\pi^0\\mu+\\mu-. Cross-sections are predicted from threshold up to the \\omega-mass region for different choises of the relevant parameters in the Lagrangian. It is suggested that measuraments of these cross-sections at low-energy high luminosity e+e- machines, like DAPHNE, will allow to distinguish between different sets of parameters. |
| 3822 | 1991-10-28 | The Low-Lying 5Li Levels | 1991 | INFN-BE_91-10.pdf | G. Fazio G. Giardina A. Italiano | |
| 5685 | 1991-10-25 | SPIN PHYSICS AT LEAR. | 1991 | INFN-AE-91-17.pdf | Franco Bradamante. | This talk will focus on the most recent results on spin observables in N<span style='text-decoration: overline'>N</span> scattering as measured at LEAR. The LEAR data are unique, and constitute a major step forward in our knowledge of N<span style='text-decoration: overline'>N</span> interaction. Since the reaction <span style='text-decoration: overline'>p</span>p<a href="https://www.codecogs.com/eqnedit.php?latex=\rightarrow&space;\bar{\Lambda&space;}\Lambda" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\rightarrow&space;\bar{\Lambda&space;}\Lambda" title="\rightarrow \bar{\Lambda }\Lambda" /></a> is covered in a different talk, I will speak only of the <span style='text-decoration: overline'>p</span>p<a href="https://www.codecogs.com/eqnedit.php?latex=\rightarrow" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\rightarrow" title="\rightarrow" /></a><span style='text-decoration: overline'>p</span>p elastic and <span style='text-decoration: overline'>p</span>p<a href="https://www.codecogs.com/eqnedit.php?latex=\rightarrow" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\rightarrow" title="\rightarrow" /></a><span style='text-decoration: overline'>n</span>n charge-exchange channels, and I will also show some new preliminary results for the last reaction. After a brief review of the physics objectives of this field, I will illustrate all the work which has come out of LEAR. For completeness I will comment also on the scattering data with unpolarized particles, but clearly I will focus mostly on the new data on spin observables. In the final part of this talk I will try to compare the experimental finding with theory, and I will comment on the theoretical work which is going on. Of course, I would have by far preferred that these final comments be done by R. Vinh Mau, as originally anticipated in the Scientific Program of the conference, but he is not here and I feel authorized to proceed. By now many reviews exist on the LEAR results<sup>1)</sup>, and the Proceedings of the many LEAR Workshops<sup>2)</sup> constitute the best reference for this activity. I myself have reviewed the field recently<sup>3,4)</sup>, so necessarily what I will say is not very different from what I said last year in Stockholm or in Paris. Still, I have to stress a major difference, namely in this talk I will not mention perspectives, or future outlook. Following the recommandations of the Cogne Meeting in September '90 to give low priority to N<span style='text-decoration: overline'>N</span> reaction dynamics studies, the CERN SPSLC Committee has not approved the new measurements which had been proposed<sup>5)</sup>, which were a. Measurement of A<sub>On</sub> for <span style='text-decoration: overline'>p</span>n<a href="https://www.codecogs.com/eqnedit.php?latex=\rightarrow" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\rightarrow" title="\rightarrow" /></a><span style='text-decoration: overline'>p</span>n; b. Measurement of K<sub>kOOk</sub> for <span style='text-decoration: overline'>p</span>p<a href="https://www.codecogs.com/eqnedit.php?latex=\rightarrow" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\rightarrow" title="\rightarrow" /></a><span style='text-decoration: overline'>p</span>n; c. Measurement of D<sub>OnOn</sub> for <span style='text-decoration: overline'>p</span>p<a href="https://www.codecogs.com/eqnedit.php?latex=\rightarrow" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\rightarrow" title="\rightarrow" /></a><span style='text-decoration: overline'>p</span>p; d. Measurement of <a href="https://www.codecogs.com/eqnedit.php?latex=\Delta&space;\sigma&space;_{T}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\Delta&space;\sigma&space;_{T}" title="\Delta \sigma _{T}" /></a> for <span style='text-decoration: overline'>p</span>p. This means that no new information can be expected in the near future, and all we can conclude in this field must be inferred from the data which have already been taken and which I am about to review. |
| 3806 | 1991-10-25 | Spin Physics at LEAR | 1991 | INFN-AE_91-17.pdf | F. Bradamante | |
| 618 | 1991-10-15 | NON BAYESAN DIAGNOSIS | 1991 | LNF-91-068(R).pdf | E. ETIM | Diagnosis is usually understood to be, basically, a strategy, that is decision making in the face of uncertainties. In other words, it is all a matter of probabilities and no dynamics. This is not completely true. The crucial assumption which determines the structure of a diagnosis bears mostly on dynamics rather than on probabilities. The assumption is that of microscopic reversibility. It is this assumption which gives rise to the equation of detailed balance known, in probability theory, under the name of Bayes's theorem. Microscopic reversibility does not, however, imply, necessarily, time reversal invariance. By their very nature cause-effect correlations involve dynamics with a prefered direction of time. The time reversal invariant part of this dynamics can be projected out and shown to give rise to a detailed balance equation in two pairs of variables and thence to a generalization of Bayes's theorem. The operator which realises this projection is the diagnosis. |
| 3805 | 1991-10-15 | Heavy Quark Production | 1991 | INFN-AE_91-16.pdf | L. Rossi | |
| 5684 | 1991-10-14 | HOW LARGE CAN BE DIRECT CP VIOLATION IN K → 3π FROM CHIRAL PERTURBATION THEORY? | 1991 | INFN-AE-91-15.pdf | G. D'Ambrosio, G. Isidori, N. Paver. | Using a general parametrization, we discuss the size of direct CP violation in charged K <a href='https://www.codecogs.com/eqnedit.php?latex=\rightarrow&space;3\pi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\rightarrow&space;3\pi' title='\rightarrow 3\pi' /></a> decays, as it should be expected from chiral perturbation theory including chiral corrections to order <i>p</i><sup>4</sup>. These terms are required in order to remove the <a href='https://www.codecogs.com/eqnedit.php?latex=\Delta&space;I' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Delta&space;I' title='\Delta I' /></a> = 3/2 suppression. We argue that the magnitude of these effects for the slope asymmetry, although enhanced by the <a href='https://www.codecogs.com/eqnedit.php?latex=\Delta&space;I' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\Delta&space;I' title='\Delta I' /></a> = 1/2 rule, should be at most of the order of 10<sup>-5</sup>. |
| 617 | 1991-10-10 | THE MICROANALYSIS STATION AT PWA | 1991 | LNF-91-067(P).pdf | E. BURATTINI, A. RIVEROS, M. RUBIO, H. J. SANCHEZ | The use of storage rings as dedicated sources of synchrotron radiation together with the new developments of insertion devices have allowed, in recent years, the application of synchrotron radiation to the conventional methods of X-ray fluorescence (XRF). In addition, the so-called XRF induced by synchrotron radiation has given rise to the development of new spectrochemical techniques[1]. An experimental station for X-ray fluorescence studies has been installed at the PWA laboratory of the LNF. This station is mainly oriented to microanalysis, but it is possible to perform other techniques. The apparatus existing at the beginning of 1991 consisted of an experimental chamber allowing conventional KRF (SRXRF) and total reflection X-ray fluorescence (TRXRF), but the latter was never implemented. The conventional system consists of a sample holder (3x6 cm) that can be positioned along the X,Y axis with a precision of \\mu m. The geometry of measurement is 90 degrees with 45 degrees of incident and take-off directions. At the entrance of the chamber two slits allow an orthogonal collimation. The detecting system consists of a solid-state detector with a Si(Li) crystal (Silena), a high voltage source (ORTEC 478), an amplifier (ortec 572), and a multichannel analyzer (ORTEC 916). |
| 561 | 1991-10-08 | COLD FUSION: WHAT DO THE LAWS OF NATURE ALLOW AND FORBID? | 1991 | LNF-91-066(P).pdf | G. PREPARATA | This talk will not be a summary of the theoretical contributions to this Conference: I think that the individual papers that this book collects can give a much better representation of the work that is now going on in the field than i can possibly attempt to give in a short talk. As a partial excuse I may quote a recent review article of mine^[1], where I try to discuss the most significant theories of cold fusion, and the fact that nothing much new has happened in the last few months. Nor will I discuss cold fusion in the non-equilibrium conditions prevailing in Titanium^[2], fracto-emission^[3] and 'lukewarm' fusion^[4]. I shall rather try to examine first the strange facts of hydrogen incorporation into Palladium, and then I shall discuss the phenomena of cold fusion in relation to those facts. In the light of the known experimental data I will then discuss the general features of what i might call 'possible' and 'impossible' theories of cold fusion, somehow drawing a demarcation line between which theoretical ideas can and cannot explain those observations, given the well estabilished and accepted general laws of condensed matter (Quantum Electro Dynamics, QED) and nuclear physics (Quantum Chromo Dynamics, QCD). My discussion will follow quite closely a paper recently completed in collaboration with M.Fleishmann and S.Pons[5]. |
| 558 | 1991-10-04 | NUOVO SISTEMA DI TIMING PER ADONE | 1991 | LNF-91-064(NT).pdf | G. FELICI, M. SERIO | Durante la fase di iniezione in Adone devono essere generati dei segnali di sincronismo fra la radiofrequenza (RF) acceleratrice, il cannone del LINAC ed i kickers di iniezione in modo da poter selezionare il numero (da uno a diciotto) e la posizione dei bunches da iniettare. Inoltre per i sistemi di feedback longitudinali e trasversali devono essere generati dei segnali di trigger sincroni con i segnali dei bunches. Il sistema di timing attualmente utilizzato permette di operare con tre bunches al massimo e non puo' essere gestito via computer. Inoltre poiche' il sistema e' implementato in tre moduli standard NIM il funzionamento complessivo puo' essere influenzato da fattori quali ad es. le interconnessioni fra i moduli e la stabilita' delle tensioni di alimentazioni (piu' racks in sala controllo sono serviti da un unico alimentatore con conseguenti problemi di cadute di tensione e disturbi in funzione sia del tipo di carico che della corrente assorbita). Per superare le limitazioni di cui sopra parte del circuito e' stata riprogettata in modo da funzionare autonomamente dal punto di vista delle alimentazioni (alimentazione da rete), e di iniettare fino a diciotto bunches con controllo remoto (via GPIB). |
| 559 | 1991-10-04 | Piattaforma Girevole per Antenne Gravitazionali | 1991 | LNF-91-65(NT).pdf | B. Dulach | In questa nota vengono descritti i criteri seguiti per definire i parametri cinematici (velocita' e accelerazione) di una piattaforma girevole, da utilizzare per l'orientamento dell'antenna gravitazionale dell'esperimento ROG, tali da non perturbare lo stato proprio dell'antenna. This report describes the principles used to define the kinematic parameters (speed and acceleration) for a turnable, used to orientate the cryogenic gravitational wave antenna, utilized in the ROG experiment. The turnable main goal is not perturb the antenna conditions. |
| 560 | 1991-10-04 | Rapporto Attività 1990 | 1991 | LNF-91-065(IR).pdf | Curato dal Servizio Documentazione | |
| 3802 | 1991-10-04 | Neutrino Astronomy and Weakly Interacting Particles | 1991 | INFN-AE_91-13.pdf | P. Pistilli | |
| 557 | 1991-10-03 | DAFNE CAVITY R & D - A SHUNT IMPENDANCE MEASUREMENT SYSTEM BASED ON THE PERTURBATIVE METHOD | 1991 | LNF-91-063(IR).pdf | P. BALDINI, R. BONI, G. DI PIRRO, A. GALLO, F. LUCIBELLO, L. PALUMBO, S. QUAGLIA, M. SERIO, C. VACCAREZZA | RF cavities are likely to drive multibunch instabilities of the DAPHNE beam. Therfore resonator characterization is among the crucial R&D activities of the project. The aim of this paper is to present a perturbative system - based on the Slater theorem - for both longitudinal and transverse impedance measurements of any selected oscillating mode. Theoretical fundamentals, hardware assembling and data acquisition are described, together with the experimental results of the calibration measurement made on a 360 MHz single-cell cavity. |
| 3821 | 1991-09-23 | The Atlas of the Cross Sections of Mesic Atomic | 1991 | INFN-BE_91-9.pdf | C. Chiccoli V.I. Korobov V.S. Melezhik P. Pasini L.I.Ponomarev J Wozniak | |
| 5683 | 1991-09-17 | A MEASUREMENT OF THE PARTIAL HADRONIC WIDTHS OF THE Z<sup><small>O</small></sup> USING NEURAL NETWORKS. | 1991 | INFN-AE-91-12.pdf | C. Bortolotto, G. Cosmo, A. De Angelis, P. Eerola, I. Kalkkinen, A. Linussio. | From the data collected by the DELPHI detector at LEP during 1990, the hadronic branching fractions of the Z<sup><small>O</small></sup> boson into all five known quarks have been measured for the first time in the literature. A classifier based on a feed-forward neural network has been used for separating the hadronic decays of the Z<sup><small>O</small></sup> into four classes, corresponding to (u<span style='text-decoration: overline'>u</span>d<span style='text-decoration: overline'>d</span>) unresolved, s<span style='text-decoration: overline'>s</span>, c<span style='text-decoration: overline'>c</span>, b<span style='text-decoration: overline'>b</span>. Data on the hard final-state photon radiation have been then used to resolve the decay rate into u<span style='text-decoration: overline'>u</span> pairs from the decay rate into d<span style='text-decoration: overline'>d</span> pairs. The preliminary relults are consistent with the predictions from the Standard Model. Problems related to the eltimate of systematics are discussed. |
| 5682 | 1991-09-17 | RECENT DELPHI RESULTS ON MULTIPLICITY FLUCTUATIONS IN HADRONIC FINAL STATES FROM THE DECAY OF THE Z<sup><small>O</small></sup> BOSON. | 1991 | INFN-AE-91-11.pdf | A. De Angelis, N. Demaria. | An analysis of the fluctuations in the phase space distribution of hadrons produced in the decay of the Z<sup><small>O</small></sup> boson has been carried out, using the method or factorial moments. The high statistics collected by the DELPHI experiment at LEP during 1990 (around 80,000 events after the cuts) allowed studies not only for the global event sample, but also in intervals of p<sub>t</sub> and multiplicity, and for different jet topologies. |
| 615 | 1991-09-11 | HIGH RESOLUTION, LOW-ENERGY E.M. Pb-SCIFI CALORIMETRY. AN INVESTIGATION ON FIBRES AND TESTS ON PHOTON BEAM WITH LOW-ENERGY PHOTONS | 1991 | LNF-91-061(R).pdf | S. BIANCO, R. CASACCIA, L. DANIELLO, F.L. FABBRI, M. GIARDONI, D. HERTZOG, S. HUGHES, M. LINDOZZI, L. PASSAMONTI, P. REIMER, V. RUSSO, S. SARWAR, R. TAYLOE, L. VOTANO, A. ZALLO | This article reports on studies aimed to characterise the properties of plastic scintillating fibres to be used in head-on, 1:1 Pb-SCIFI calorimetric modules. The effect of glue on the attenuation of the light transported by cladding close to the photomultiplier tube is studied and found to effectively decrease the contribution of cladding light. Pb-SCIFI modules have been assembled and tested on a 20-80 MeV tagged photon beam. Good linearity and energy resolution better than 6%/ \\sqrt{E[GeV]} were achieved, therefore showing that this technique is suitable for experimentation at \\phi-factories. |
| 616 | 1991-09-11 | THE S.C.I.C. DETECTOR: AN UNCONVENTIONAL DESIGN FOR THE DETECTION OF LOW-ENERGY (20-300) MeV PHOTONS | 1991 | LNF-91-062(R).pdf | S. BIANCO, R. CASACCIA, F. L. FABBRI, M. GIARDONI, L. PASSAMONTI, V. RUSSO, S. SARWAR, L. VOTANO, A. ZALLO | We report on the simulated performances of a non-homogeneous e.m. calorimeter based on a 5X_0 tracking section using CsI(Tl) fibres, followed by a 10 X_0 Pb-SCIFI head-on back section. Our study shows that such a technique is quite promising for the high-efficency detection of photons in the energy range of interest at a \\phi-factory machine. |
| 3832 | 1991-09-09 | Stochastic Description of Internal Targets Effects on Electron Ring | 1991 | INFN-TC_91-8.pdf | M. Taiuti V. Muccifora C. Costa M. Anghinolfi N. Bianchi P. Corvisiero E. DeSanctis G. Gervino P. LeviSandri V. Lucherini V.I. Mokeev E. Polli G. Ricco M. Ripani P. Rossi A. Zucchiatti | |
| 612 | 1991-09-02 | PHENOMENOLOGICAL STATISTICAL ANALYSIS OF LEVEL DENSITIES, DECAY WIDTHS AND TIME LIVES OF EXCITED NUCLEI | 1991 | LNF-91-058(P).pdf | A. S. ILJINOV, M. V. MEBEL, N. BIANCHI, E. DE. SANCTIS, C. GUARALDO, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, P. ROSSI | All existing data on the level densities, decay widths and the time lives of excited nuclei have been analyzed in the framework of the statistical model in order to better determine the parameters of the phenomenological systematics of the nuclear level density. Data on level densities of several hundred nuclides obtained in the excitation energy range from 2 MeV up to 20 MeV were used. The level densities of nuclei with large deformation (at the sddle point) have been studied by analyzing the data on the neutron emission and fission partial width ratio \\Gamma_\\pi/ \\Gamma_f, and the values of the fission barrier heights B_f, the level density parameters ratio a_f/a_n and the saddle point shell corrections \\deltaW_sp have been extracted. The influence of shell and collective effects on the level density and the decay widths of nuclei which have different excitation energies and deformations has been studied. |
| 613 | 1991-09-02 | DEUTERON PHOTODISINTEGRATION AT INTERMEDIATE ENERGY AND QUARK MODELS | 1991 | LNF-91-059(P).pdf | E. DE SANCTIS, A. KAIDALOV, L. A. KONDRATYUK, P. ROSSI, N. BIANCHI, P. LEVI - SANDRI, V. MUCCIFORA, E. POLLI, A. R. REOLON | We have examined the behaviour of the forward and backward data for the \\gammad\\rightarrow pn reaction at intermediate energy in the framework of the quark-gluon model and Regge phenomenology. Our model reproduces rather well the experimental values. |
| 614 | 1991-09-02 | OPTICAL DESIGN FOR GILDA, A BENDING MAGNET BEAMLINE AT THE E.S.R.F | 1991 | LNF-91-060(IR).pdf | S. PASCARELLI, F. BOSCHERINI, A. MARCELLI, S. MOBILIO | In this report we give a detailed description of the optics for GILDA, the Italian Collaborating Research Group beamline at the European Synchrotron Radiation Facility Ray-tracing simulations and simple calculations are used to discuss the effects which determine flux, resolution and spot size. Depending on the energy (in the range 5 to 50 keV) we expect fluxes between 3x10^10 and 6x10^12 photons/second, a resolution between 3x10^-4 and spot sizes usually less than 1 mm. |
| 3799 | 1991-08-23 | Measurement of the Average Lifetime of B Hadrons with the Delphi Detector | 1991 | INFN-AE_91-10.pdf | C. Troncon | |
| 5681 | 1991-08-23 | MEASUREMENT OF THE TOP MASS NEAR THE THRESHOLD AT AN e<sup>+</sup>e<sup>-</sup> COLLIDER | 1991 | INFN-AE-91-9.pdf | U. Stiegler. | In this note a method for measuring the top mass at a linear e<sup>+</sup>e<sup>-</sup> collider near the t<span style='text-decoration: overline'>t</span> production threshold is presented using properties of the t<span style='text-decoration: overline'>t</span> final states. A resolution on the top mass of 400<i>MeV/c<sup>2</sup></i> with an integrated luminosity of 1<i>fb</i><sup>-1</sup> is obtained. |
| 5680 | 1991-08-22 | MEAN-FIELD QUANTUM GRAVITY. | 1991 | INFN-AE-91-8.pdf | R. Floreanini, R. Percacci. | We describe a new approach to quantum gravity, based on a kind of mean-field approximation. The action, which we choose to be quadratic in curvature and torsion, is made polynomial by replacing the inverse vierbein by its mean value. This action is used to compute the effective action for the vierbein and hence its vacuum expectation value. Selfconsistency is then enforced by requiring that this vacuum expectation value be proportional to the mean field. We have explicitly carried out this self-consistent procedure at one-loop in the case of a mean field corresponding to Minkowski space, de Sitter space and in the long wavelength limit for a generic space. General Relativity is recovered as a low energy approximation. |
| 609 | 1991-08-20 | THE QUENCH ANALYSIS OF A 6 T S.C. WIGGLER FOR ADONE AT FRASCATI | 1991 | LNF-91-054.pdf | M. BARONE, A. CATTONI, R. MARABOTTO, G. MASULLO, R. PUZONE, C. SANELLI | A single pole 6T s.c. wiggler with two racetracks NbTi superconducting coils, separated by a central plate and kept together by two iron jokes, has been designed and built in the Frascati INFN, LNF Laboratories in cooperation with the Ansaldo ABB Componenti, Genova, Italy. The s.c. magnet and two low field compensating warm poles, will be installed in the near future on the straight section no. 10 of the e+,e- storage ring Adone, to be used as wave length shifter to produce a hard X-ray flux of 2.4 10^12 photons/s/mrad in 0.1% bandwith at a critical energy of 9 keV, six times higher than the one produced by the accelerator bending magnets. The magnet's characteristics and the cryogenic facility dedicated have been illustrated in previous papers 1,2; this article will make an analysis of the tipical quench during the training. |
| 610 | 1991-08-20 | CORRELATION BETWEEN MAGNETISM AND LOCAL ORDER: THE CASE OF THE MIXED VALENT SYSTEM CeFe2 | 1991 | LNF-91-055.pdf | A. MARCELLI, J. CHABOY, J. GARCIA, F. SETTE | This work is an extensive study of the cubic Laves phase rare earth compounds: CeFe_2 and its related hydrides performed by X-ray absorption spectroscopy. The CeFe_2 system has been investigated by Extended X-ray Absorption Fine Structure (EXAFS) both at cerium and iron sites and by X-ray Absorption Near Edge Spectroscopy (XANES) at different edges of both cerium and iron atomic species. Attempts to relate magnetic properties of this system with the electronic properties and the crystal structure of the disordered hydridate phases have been performed. |
| 611 | 1991-08-20 | TALADON: A POLARIZED AND TAGGED GAMMA RAY BEAM | 1991 | LNF-91-056.pdf | D. BABUSCI. E. CIMA, M. IANNARELLI, E. TURRI, F. BASTI, I. HALPERN, L. CASANO, A. D'ANGELO, D. MORICCIANI, P. G. PICOZZA, C. SCHAERF, B. GIROLAMI | We present the first measurements of the gamma-ray beam energy resolution obtained with a new tagging system for the Ladon facility on the storage ring Adone at Frascati. A resolution of the order of 3% in the energy region of 30-80 MeV is obtained in accordance with predictions. |
| 608 | 1991-07-17 | HARD PHOTON CORRECTIONS TO BHABHA SCATTERING NEAR THE Z0 | 1991 | LNF-91-053(P).pdf | F. AVERSA, M. GRECO | A previuos analysis of QED radiative corrections to Bhabha scattering in the vicinity of the Z^0 is improved by a better analytical treatment of hard photon terms with sizeable effects on the tail of the resonance. A quantitative discussion of two-loop corrections and comparison with some existing Montecarlo codes show that quite generally, the theoretical uncertainty at large angles cannot be reduced much below 1%. |
| 607 | 1991-07-12 | THE INTERMEDIATE MASS HIGGS AT LHC | 1991 | LNF-91-052(R).pdf | G. PANCHERI | The search for the intermediate mass Higgs boson at the Large Hadron Collider is presented. Background processes and signals for the intermediate mass higgs, i.e. one for which mw\\leqmh\\leq2mw are discussed. it is pointed out that the search for Higgs bosons in the region around and just above the Z^0-mass puts very stringent limits on the detectors and that this region can be fully explored only with a very high luminosity option. |
| 606 | 1991-07-11 | MONTE CARLO SIMULATION OF A LEAD-SCINTILLATING FIBERS CALORIMETER | 1991 | LNF-91-051(R).pdf | R. DE SANGRO | In this paper a detailed GEANT simulation of an electromagnetic calorimeter based on the use of scintillating fibers is briefly described. Some preliminary results on the efficiency for low energy photons are presented and compared with similar results obtained with EGS4. |
| 604 | 1991-07-10 | DECAY LENGTH RECONSTRUCTION: K0 s,l->p0p0 | 1991 | LNF-91-049(R).pdf | C. BLOISE | The evaluation of the accuracy in reconstructing the K^0 neutral decay vertex is presented, assuming a calorimeter with good timing performances (\\sigma t \\approx 150 ps in the energy region of interest), besides reasonable energy and spacial resolution. The depenence on the K^0 time of flight is discussed. Results concern also the case in which one proton coming from \\pi^0 decay escapes the detection. |
| 605 | 1991-07-10 | A Pb - SCI.FI CALORIMETER FOR DAFNE | 1991 | LNF-91-050(R).pdf | A. ANTONELLI, S. BERTOLUCCI, C. BLOISE, F. BOSSI, P. CAMPANA, M. CORDELLI, M. CURATOLO, B. ESPOSITO, S. MISCETTI, F. MURTAS, G. NICOLETTI, V. PATERA | The requirements of a calorimeter for DAPHNE experiments are discussed. An idea based on a sampling calorimeter, with very fine absorbing medium and excellent timing properties, is presented, along with the design parameters and simulation studies of a prototype currently under construction. Preliminary results on timing properties of the active medium (i. e. scintillating fibers) are also given. |
| 600 | 1991-07-09 | DETECTOR SUBSYSTEMS INTERPLAY IN THE e'/e MEASUREMENT AT DAFNE | 1991 | LNF-91-044(R).pdf | M. PICCOLO | The optimization of the components of an experimental apparatus able to perform a 1 x 10^-4 measurement of \\epsilon'/ \\epsilon at DAPHNE is discussed. The requirements of each subsystem are examined, with particular emphases on the problem of systematic errors. A possible scenario for the detector is described. |
| 601 | 1991-07-09 | CP PHYSICS AT DAFNE | 1991 | LNF-91-045(R).pdf | P. FRANZINI | We briefly review K^0-meson physics, in particular the observation and phenomenology of CP violation which was discovered 27 years ago and, to date, is still only observed in Kl decays. During the intervening time much effort has been devoted to the search for direct CP violation, trying to detect whether Kl's decay to \\pi+\\pi- and \\pi^0\\pi^0 in different ratios. Since long ago e+e- colliders, pionieered at Frascati, have been considered as possible factories of clean physical states. We show the potential of DAPHNE to provide enough data to improve by an order of magnitude the sensitivity of such searches. We discuss the spatial accuracy required to measure the difference in phase of the amplitude ratios A(Kl\\rightarrow\\pi+\\pi-)/A(Ks\\rightarrow\\pi+\\pi-) and A(Kl\\rightarrow\\pi+\\pi-)/A(Ks\\rightarrow\\pi+\\pi-). We examine problems of regeneration and other physical backgrounds. Finally we discuss some requirements for electromagnetic calorimetry at DAPHNE and briefly describe a possible solution. |
| 602 | 1991-07-09 | BACKGROUNDS TO THE K^0 L --> p0 p0 CHANNEL | 1991 | LNF-91-046(R).pdf | A. CALCATERRA | The precise measurement of \\epsilon'/ \\epsilon planned at the DAPHNE \\Phi-factory requires, in order not to spoil the high statistical accuracy needed, careful control of any potentially dangerous systematic error. Two possible sources, relevant to the Kl^0\\rightarrow\\pi^0\\pi^0 channel, have been studied in the present contribution, via a Montecarlo analysis focussed on the use of the time-of-flight technique for photons detected in the e. m. calorimeter: 1)Due to the exponential distribution of Kl^0 decays, the number of Kl^0\\rightarrow\\pi^0\\pi^0 vertices accepted inside a radially defined fiducial volume will be a function of the shape and simmetry of the resolution obtained for the radial coordinate of the vertex. 2)The main background to Kl^0\\rightarrow\\pi^0\\pi^0 events will come from Kl^0\\rightarrow\\pi^0\\pi^0\\pi^0 events in which 2 photons have been missed, either absorbed by the material in front of the calorimeter, or out of angular acceptance. The ultimate rejection of these events will be made using constrained kinematic fits, for which energy resolution, more than spatial resolution, will be the figure of merit. |
| 603 | 1991-07-09 | N=2 CHIRAL BOSONS IN SUPERSPACE | 1991 | LNF-91-047(P).pdf | S. BELLUCCI, E. IVANOV, S. KRIVONOS | We explore N=2 chiral bosons in (2,2), (2,0) and (0,2) superspaces. We start with a manifestly covariant (2,2) description in the Ogievetssky-Sokatchev geometric approach and then, by fixing gauges with respect to local Siegel's transformations, obtain previously unknown (2,0) and (0,2) actions, The anomalous N=2 Feigin-Fuchs term in a (2,0) superfield form is presented. We introduce a Liouville representation for the Feigin-Fuchs-term-modified N=0, N=1 and N=2 chiral bosons, thus demonstrating the relevance of these systems to the two-dimensional (super)gravity and non-critical (super)string theories. |
| 555 | 1991-07-09 | SILICON TRACKING CALORIMETER FOR ANTIMATTER SEARCH IN SPACE: FIRST EXPERIMENTAL RESULTS FROM A PROTOTYPE | 1991 | LNF-91-048(IR).pdf | G. BARBIELLINI, G. BASINI, V. BIDOLI, M. BOCCIOLINI, F. BONGIORNO, A. BUCCHERI, M. CANDUSSO, F. CELLETTI, C. DE - FABRITIIS, M. P. DE - PASCALE, F. FRATNIK, A. INCICCHITTI, F. MASSIMO - BRANCACCIO, M. MENICHELLI, A. MORSELLI, A. PEREGO, P. PICOZZA, D. PROSPERI, M. RICCI, I. SALVATORI, P. SCHIAVON, P. SPILLANTINI, A. VACCHI, N. ZAMPA | This report presents the preliminary results of the performances of a prototype of a silicon tungsten calorimeter, which has been conceived as a high-granularity tracking calorimeter for cosmic ray studies. The calorimeter contains 20 XY sampling planes interleaved with 19 showering material planes (W, 0.5 X_0 = 1.75 mm). One sensitive plane is obtained two silicon strip detectors (Si-D) (60 x 60) mm^2 divided in 16 strips 3.6 mm wide. The strips of the two detectors are perpendicular to each other in order to provide the transverse distributions in both coordinates at each sampling. The basic characteristics of the design and the first experimental results obtained at a test beam at CERN PS for 2, 4 and 6 GeV electrons and pions are reported. The main results here presented are: the response of the calorimeter to the electron energies, the transverse shower profiles at different calorimeter depths as well as the patterns of the electron induced electromagnetic shower and those of the interating and non interating pions. The angular resolution has been measured for electron showers at 4 GeV. The calorimeter performances and the adopted design criteria are also considered for possible applications to preshower detectors. |
| 5679 | 1991-07-09 | LASER-INDUCED TRANSITION 3D-3P IN MUONIC HELIUM. | 1991 | INFN-AE-91-7.pdf | L. Bracci, A. Vacchi, E. Zavattini. | In recent years quantum electrodynamics (QED) vacuum polarization corrections (at low momentum transfer) has been tested in several physical situations using muonic atoms: this has permitted a direct check for different values of <a href='https://www.codecogs.com/eqnedit.php?latex=Z\alpha' target='_blank'><img src='https://latex.codecogs.com/gif.latex?Z\alpha' title='Z\alpha' /></a>[1- 6]. The vacuum polarization test obtained by measuring the 2S-2P energy difference, by means of laser-induced transition in muonic helium, has reached the 0.17% level. Such a test is limited by the uncertainty of the helium electric form factor; in order to overcome this limit, a scheme to measure the 3D-3P energy difference in muonic helium has been suggested and a test measurement performed. In this article we wish to make some comments on this experimental method and discuss its future possibilities. |
| 598 | 1991-07-08 | MEASUREMENT OF THE R e’/e AND DF PARAMETERS AT A F-FACTORY BY MEANS OF THE K1 Ks -> p+p-p0p0 DECAY TIME DIFFERENCE | 1991 | LNF-91-042(R).pdf | V. PATERA | An analysis of the CP violation parameter (\\epsilon l)/ \\epsilon has been made by means of the K_l K_s \\rightarrow\\pi+\\pi-\\pi0\\pi0 decay time difference distribution. Non-gaussian experimental resolution on the K_l,K_s decay length has been considered. Background from the \\phi\\rightarrow f_0(975)\\gamma\\rightarrow K_s K_s\\gamma events is discussed. |
| 599 | 1991-07-08 | CUSB @ DAFNE? | 1991 | LNF-91-043(R).pdf | J. LEE - FRANZINI | A very compact precision electromagnetic spectrometer, the CUSB-II detector, which has been used with great success to study \\Upsilon spectroscopy, search for the exotic particles and measure properties of the B and B* mesons at the Cornell Electron Storage Ring, is described. It seems to be an ideal instrument for tuning up DAPHNE as it is being commissioned and for the performance of the first spectroscopic experiment. |
| 3820 | 1991-07-08 | CAP - A Computer Aided System | 1991 | INFN-BE_91-8.pdf | S. Banfi P. Guazzoni G.F. Taiocchi L. Zetta | |
| 553 | 1991-07-05 | HYPPOCAMPUS: A HYPERCARD GRAPHIC INTERFACE TOWARD CAMAC & VME | 1991 | LNF-91-040(P).pdf | A. MARTINI, A. STECCHI, L. TRASATTI | We have implemented the standard ESONE CAMAC routines[1] as Hypercard[2] external functions (XFCN's), using MPW 3.1 PASCAL[3]. The routines are available in a demo stack, HYPPOCAMPUS (HYPercard POwer for CAMac PUShbutton), which is the software equivalent of the CAMAC Manual Controller. A simple VME interface is also provided. This work continues our attempt to use Hypercard as a powerful and simple human interface tool for data acquisition and control. |
| 554 | 1991-07-05 | A CENTRALIZED CONTROL SYSTEM FOR THE DAFNE F-FACTORY | 1991 | LNF-91-041(P).pdf | G. DI PIRRO, C. MILARDI, M. SERIO, A. STECCHI, L. TRASATTI | We describe the control system for the new DAPHNE \\Phi-factory under construction at the Frascati National Laboratories. The system is based on a centralized architecture for simplicity and reliabilty. A central processor unit coordinates all communications between the consoles and the lower level distributed processing power, and continuosly updates a central memory which contains the whole machine status. This memory constitutes the machine database prototype. A simple message passing scheme built on a system of mailboxes takes advantage of high speed busses and of Fiber Optic interfaces. Macintosh II personal computers are used as consoles. The lower levels are all built using the VME standard. |
| 3819 | 1991-07-05 | Q rel's behaviour in the P+T Æ Ai + Ai-k Æ A1 + A2 + A3 reaction | 1991 | INFN-BE_91-7.pdf | P. D'Agostino A. D'Arrigo G. Fazio G. Giardina A. Italiano A. Taccone R. Palamara | |
| 596 | 1991-07-02 | ELECTROMAGNETIC CALORIMETERS FOR DAFNE THAT MAKE USE OF CsI(TI) AND Pb + FIBER ELEMENTS | 1991 | LNF-91-038(R).pdf | S. BIANCO, R. CASACCIA, F.L. FABBRI, M. GIARDONI, L. PASSAMONTI, M. LINDOZZI, N. I. QAZI, V. RUSSO, S. SARWAR, L. VOTANO, A. ZALLO | In this paper the physical performances of a calorimeter composed of a highly segmented tracking section (5X_0) that uses CsI(TI) elements, followed by a total absorption 10X_0 Pb-scintillating fiber segment, are compaired with those of a more conventional Pb-scintillating fiber detector. The \\gamma energy range covered by these detectors is (20 - 300)MeV, as requested by the experimentation at e+e- \\phi factory machines. |
| 597 | 1991-07-02 | PERFORMANCES OF HEAD-ON Pb-SCIFI CALORIMETRIC MODULES | 1991 | LNF-91-039(R).pdf | D. BABUSCI, A. BARILE, S. BIANCO, R. CASACCIA, L. E. CASANO, M. CAPOGNI, A. D' ANGELO, L. DANIELLO, D. FABBRI, F. L. FABBRI, G. GATTA, M. GIARDONI, B. GIROLAMI, D. HERTZOG, S. HUGHES, M. LINDOZZI, D. MORICCIANI, L. PASSAMONTI, N. I. QAZI, P. REIMER, V. RUSSO, S. SARWAR, R. TAYLOE, M. VENTURA, L. VOTANO, A. ZALLO | The article reports on performances of head-on Pb-scintillating fibres e.m. calorimetric modules ('H.O.P.S. ') exposed to a 20-80 MeV tagged photon beam. Good linearity and energy resolution better than 6%/ \\sqrt{E} were achieved therefore showing that this technique is suitable for experimentation at \\phi-factories, even at the lowest end of the photon energy range. |
| 556 | 1991-07-02 | FABRICATION AND PERFORMANCES OF NbZr/Oxide/NbZr THIN FILM JOSEPHSON JUNCTIONS | 1991 | LNF-91-057(P).pdf | U. GAMBARDELLA, D. DI GIOACCHINO, S. FRIGERIO, G. PATERNO', M. CIRILLO | We report on the fabrication of symmetrical NbZr-Ox-NbZr Josephson junctions by means of thin film RF magnetron sputtering deposition. The insulating barrier consistent of natural oxide thermally grown in air at room temperature. The variation of the superconducting gap \\Delta as a function of the temperature was measured by recording the I-V characteristics. The experimental data are in good agreement with the dependence numerically computed from the BCS theory. The magnetic behavior of the maximum Josephson current was measured and both the magnetic penetration depth and the Josephson penetration depth were computed. By means of the Kulik theory on the junction self-induced resonances the microwave quality factor Q of the junctions, and surface impedance of the films have been estimated. |
| 3818 | 1991-07-01 | Technical Peculiarities of the Multics Apparatus for Heavy Ion Reactions at Intermediate Energies | 1991 | INFN-BE_91-6.pdf | A. Moroni I. Iori L. Manduci R. Scardaoni S. Angius A. Cortesi L. Dellera G. Di PietroSun ChongwengZhang Yuzhao | |
| 595 | 1991-06-26 | D.A.F.N.E. DESIGN CRITERIA AND PROJECT OVERVIEW | 1991 | LNF-91-037(R).pdf | P. AMADEI, A. ARAGONA, S. BARTALUCCI, M. BASSETTI, M. E. BIAGINI, C. BISCARI, R. BONI, A. CATTONI, V. CHIMENTI, A. CLOZZA, S. DE SIMONE, G. DI PIRRO, S. FAINI, R. FEDELE, A. GALLO, A. GHIGO, S. GUIDUCCI, H. HSIEH, S. KULINSKI, M. R. MASULLO, C. MILARDI, M. MODENA, L. PALUMBO, M. PREGER, G. RAFFONE, C. SANELLI, M. SERIO, F. SGAMMA, B. SPATARO, A. STECCHI, L. TRASATTI, C. VACCAREZZA, V. G. VACCARO, M. VESCOVI, S. VESCOVI, G. VIGNOLA, J. WANG, M. ZOBOV | The basic design criteria of DAPHNE, the Frascati \\Phi-factory, are discussed and a project overview is presented. |
| 594 | 1991-06-25 | THE ICARUS LIQUID ARGON TPC: A FULL IMAGING DEVICE FOR LOW ENERGY e+e- COLLIDERS? | 1991 | LNF-91-036(R).pdf | A. BETTINI, A. BRAGGIOTTI, F. CASAGRANDE, P. CASOLI, P. CENNINI, S. CENTRO, M. CHENG, A. CIOCIO, S. CITTOLIN, D. CLINE, B. DAINESE, F. GASPARINI, L. MAZZONE, G. MURATORI, G. PANCHERI, A. PEPATO, G. PIANO - MORTARI, P. PICCHI, F. PIETROPAOLO, P. ROSSI, C. RUBBIA, S. SUZUKI, S. VENTURA, H. WANG, M. ZHOU | |
| 3831 | 1991-06-25 | TOPGUN: A New Way to Increase the Beam Brightness of RF Guns | 1991 | INFN-TC_91-7.pdf | L. Serafini M. Ferrario C. Pagani R. Rivolta | |
| 593 | 1991-06-18 | SHIELDING CURRENTS INFLUENCE ON INTERGRANULAR COUPLING IN HIGH Tc SUPERCONDUCTORS | 1991 | LNF-91-035.pdf | S. PACE, A. SAGGESE, L. LIBERATORI, B. POLICHETTI, F. CELANI | In this paper we analyze the weakly coupled structure of high Tc superconducting granular samples in terms of a Josephson junctions network. We start from the well known results on superconducting loops closed by Josephson junctions, and show that the energy barrier for entrapping or detrapping flux quanta is essentially determined by the shielding currents crossing the junctions which remove the states generation. This effect corresponds to the absence of degeneration of the thermodynamic potential as a function of different number of flux quanta trapped in the superconducting loops. Following this approach we remark that the superconducting glass model neglects the effects of shielding currents and may be a poor approximation. On the contrary a correct description of superconducting granular systems leads to a model very similar to the usual flux creep model. |
| 592 | 1991-06-17 | PHYSICS ITEMS, DIFFERENT FROM e'/e, AT A F-FACTORY | 1991 | LNF-91-034(R).pdf | R. BALDINI - FERROLI | Some physics items, differend from \\varepsilon'/ \\varepsilon, are briefly summarized with some emphasis on the experimental point of view, as they have been presented at this workshop. Namely: structure functions of weak and e.m. Kaon decays, radiative \\Phi decays into scalar and pseudoscalar mesons, spectroscopy of excited vector mesons, \\gamma\\gamma interactions, Kaon-Nucleon and Kaon-Nucleus interactions at very low energies, Hypernuclei formation with stopped Kaons, measurement of the hadronic contribution to the muon anomalous magnetic moment. |
| 591 | 1991-06-12 | PION POLARIZABILITIES AND TESTS OF CHIRAL SYMMETRY IN TWO-PHOTON COLLISIONS AT DAFNE | 1991 | LNF-91-033(R).pdf | S. BELLUCCI, D. BABUSCI | We review the \\gamma\\gamma\\rightarrow\\pi\\pi data and conclude that the experiments should be redone and that an increase of 10^2 in the rates is expected at DAPHNE. The status of the data on the pion polarizability \\alpha_\\pi is also considered briefly. We compare the data with the prediction of chiral perturbation theory. In the case of neutral pions, by including the exchange of vector resonances in the t-channel, we prove that the O(p^6) contribution cannot be neglected and gives (20 -30)% of the cross-section at (460 - 490)meV. |
| 590 | 1991-06-07 | CHROMATICITY | 1991 | LNF-91-031(R).pdf | S. GUIDUCCI | A simple calculation of the contribution of quadrupoles and sextupoles to storage ring chromaticity is given. Problems arising from chromaticity correction are discussed. An accurate derivation of chromaticity formulae for a general bending magnet, exact also for small machines with small radius of curvature, is given. |
| 4854 | 1991-06-07 | Superconductig Wiggler for Adone: Design and Present Staus | 1991 | LNF-91-32.pdf | M. Barone, A. Cattoni, U. Gambardella G. Modestino, R. Parodi, R. Penco, M. Perrella, M. Preger, C. Sanelli, A. Savoia, F. Sgamma | A superconducting wiggler has been designed and built at Laboratori Nazionali INFN in Frascati, Italy, in collaboration with Ansaldo Componenti-Genova, to be used as an insertion device in the Adone storage ring. It will be used as a light source on the 1.5 GeV, 100mA electron beam of the accelerator, to produce about 10^12 photons/s/mrad in 0.1% band width, in the short X-ray wavelength range. In order to minimize the electron beam orbit distortion and to obtain the best phase space distribution of the generated synchrotron radiation (a single bright spot), a superconducting dipole, producing a sharp vertical field peak (6T, 12cm FWHM), between two normal conducting side dipoles (0.8T), to compensate the field integral, has been manifactured. The s.c. dipole is made up of 2NbTi coils, separated by a central plate and kept together by two 356kg total weight iron yokes. The magnet gap is 6 cm and the design current is 360 A. The system is contained in a warm bore cryostat and cooled by boiling helium at 4.6 K. The static cryostat helium consumption is of 4 l/h and, when the cryomagnet is energized, it is cooled by a 1430 S Koch liquefier/refrigerator on line with it through transfer lines. The stored energy is 184 kJ. This paper describes the latest status of the facility and the verification tests. PACS 85.25 - Superconducting devices; superconducting magnets. |
| 588 | 1991-05-29 | CHARACTERISTICS OF SYNCHROTRON RADIATION | 1991 | LNF-91-029.pdf | E. BURATTINI | When relativistic electrons experience centripetal acceleration due to the presence of a magnetic field, they emit electromagnetic waves that are commonly called 'synchrotron radiation' because first observed in the visible region, at the 70 MeV small electrosynchrotron, by a research group working in 1947 at the General Electric Research Laboratory (Schenentady - N.Y.). In 1944, Ivanenko and Pomernchuk drew attention to the fact that the electron beam circulating in the cyclic inductive accelerator, called the 'betatron', was interrupted because of the high quality of energy irradiates by the electrons. Originally, synchrotron radiation struck the attention of the physicists because of its very interesting and unusual properties, such as big power, high degree of collimation in the vertical plane, very broad spectral distribution and linear polarization on the orbital plane.The emission of radiation from relativistic particles travelling in a magnetic field has, more recently, attracted the attention of astrophysicists as well, since the synchrotron radiation mechanism has been found present, from the radiofrequency range to the X-ray range, also in the ratio emission of Crab Nebula and several supernovae. In 1950, synchrotron radiation became more important in connection with the development and construction of cyclic accelerators like electrosyncrotrons. This new type of accelerator was able to produce increasingly intense photon beams used not only to carry out pioneering works in several different fields^,3,4,5,6 but also as a tool to understand the dynamics of the particles in the accelerator. In 1955 the spectral and angular distributions of the ultra violet radiation emitted by the 300-MeV Cornell synchrotron were examined by Tomboulian and Hartman for various electron energies over a wide photon energy range. |
| 542 | 1991-05-28 | EXPERIMENTAL STUDY OF UPWARD STOPPING MUONS IN NUSEX | 1991 | LNF-91-028(P).pdf | M. AGLIETTA, G. BADINO, G. BOLOGNA, C. CASTAGNOLI, A. CASTELLINA, B. D' ETTORRE PIAZZOLI, W. FULGIONE, P. GALEOTTI, G. MANNOCCHI, P. PICCHI, O. SAAVEDRA, G. TRINCHERO, S. VERNETTO | A search for upward going stopping muon events has been performed using the NUSEX detector. The experimental flux, (1.31 +- 0.46) 10^13 \\mu/cm^2 sr, is in good agreement with the theoretical expectations of muon production from atmospheric neutrinos. The experimental limit on the flux of muons produced by high energy neutrinos from the Sun is compared to the expectations based on cold dark matter hypothesis, and mass limits on different candidates are set. |
| 587 | 1991-05-22 | B PHYSICS AT LEP | 1991 | LNF-91-027(R).pdf | G. CAPON | Recent results obtained at Lep by the Aleph, Delphi, L3 and Opal collaborations on B-lifetime, B\\overline{B} mixing, D* fragmentation function and on the inclusive decay Z^0 -> J/\\Psi + X, are presented. New world averages for the B-lifetime and the mixing parameter \\chi_B are obtained from these measurements. |
| 551 | 1991-05-21 | Z^0g* PRODUCTION AT HADRON COLLIDERS | 1991 | LNF-91-026(P).pdf | A. GRAU, G. PANCHERI, Y. N. SRIVASTAVA | we calculate the production of a Z^0\\gamma^* pair at hadron colliders from gluon-gluon fusion and quark-antiquark annihilation. We show that the gluon-gluon contribution is always much smaller than the one from quark-antiquark annihilation and compare both the cross-section for production of an intermediate Higgs boson decaying into a pair of Z^0's, one of them being produced off-the-mass-shell. |
| 3817 | 1991-05-20 | The Study of Ve e- Scattering with a Neutrino Source | 1991 | INFN-BE_91-5.pdf | C. Broggini | |
| 3830 | 1991-05-20 | Feltron: A Powerful U-Wave Power Source for High Gradient Linear Colliders | 1991 | INFN-TC_91-6.pdf | I. Boscolo L. Elias | |
| 3795 | 1991-05-17 | Two-Parameter Quantum … Deformation of GL(1/1) | 1991 | INFN-AE_91-6.pdf | L. Dabrowski Lu. Yu.… | |
| 5678 | 1991-05-15 | TWO-PARAMETER QUANTUM DEFORMATION OF <i>GL</i> (1/1). | 1991 | INFN-AE-91-6.pdf | Ludwik Dabrowski, Lu-yu Wang. | Two-parameter quantum deformation of the algebra of functions on the supergroup <i>GL</i>(1|1) and of the universal enveloping algebra <i>Ugl</i>(1|1) is presented. |
| 3816 | 1991-05-13 | Energy Dependence and Local Systematics of the Level Density Parameter at High Excitation Energies | 1991 | INFN-BE_91-4.pdf | A. D'Arrigo G. Giardina M. Hermes A. Taccone | |
| 586 | 1991-05-10 | A PERTURBATION METHOD FOR HOM TUNING IN A RF CAVITY | 1991 | LNF-91-025(P).pdf | S. BARTALUCCI, R. BONI, A. GALLO, M. SERIO, R. SCALIA, B. SPATARO, G. VIGNOLA, L. PALUMBO | The cure of multibunch instabilities is of utmost importance for the next generation of very high current storage rings. The parasitic modes of the RF cavities are chiefly responsible of these instabilities. A perturbation method is proposed to decouple the cavity parasitic modes from the bunch relative oscillation sidebands, without affecting the fundamental mode. Signal level measurements on a test pill-box cavity give encouraging results. |
| 585 | 1991-05-08 | ASPECTS FOR THE DESIGN OF THE TRIGGER AND DATA ACQUISITION AT DAFNE | 1991 | LNF-91-023(R).pdf | A. MARINI, F. RONGA | DAPHNE with his high luminosity and large crossing frequency constitues a demending environment respect to the trigger and the data acquisition systems of the experiments operating on the machine. In this context, relevant aspects for the online are the expected rates, the timing, the data throughput and the involved CPU power. |
| 550 | 1991-05-08 | CONTROLLI REMOTI DEL CANALE CALF MEDIANTE PLC | 1991 | LNF-91-024(NT).pdf | V. TULLIO, L. SANGIORGIO | In questo articolo viene descritto il sistema di controllo dei movimenti degli specchi, utilizzato sul nuovo canale di luce di Sincrotrone del PULS, CALF. |
| 5677 | 1991-05-08 | COMMENTS ON THE METASTABLE STATES OF BOSONIZED QED AROUND A LARGE-Z NUCLEUS. | 1991 | INFN-AE-91-5.pdf | R. Ragazzon. | The bosonization technique has been recently applied to the study of supercritical QED around a large-Z nucleus. New charge-neutral metastable states emerge from the spectrum of the theory and their existence represents a possible explanation of the e<sup>+</sup>e<sup>-</sup> peaks observed in heavy-ion collisions. Actually, we suspect that such metastable states might be a mere product of the approximations introduced in the treatement of the bosonized Hamiltonian. In this work we present both quantitative and qualitative arguments to support our conjecture. |
| 548 | 1991-05-06 | Laser Diagnostics of High Power Low Energy Electron Beams | 1991 | LNF-91-021(P).pdf | D. Babisci, M. Castellano, A. Ghigo, N. Cavallo, F. Cevenini | Dense and cold electron beams can be of extreme interest for ion beam cooling [1] and for the generation of coherent electromagnetic radiation in the microwave range through tre Free Electron Laser process [2]. The high current needed in these applications requires a very efficent energy recovery in the electron accelerator, to save installed power, so that nondestructive diagnostics have to be taken into account for full intensity tests. A project of a high-energy electron cooling device is actually in progress as an INFN collaboration. Several prototypes have been successfully tested and the final version has been constructed in the Frascati Laboratories. The first tests will be performed in the Legnaro Laboratories [3]. The apparatus consists of a high-frequency (40 kHz) Cockcroft-Walton generator (760 kV nominal voltage) with very low ripple (10^-4) and high stability, a Pierce electron gun followed by an accelerating tube and an energy recovery system. The energy recovery system consists of a decelerating column, similar to the accelerating one, and a collector. In order to compensate the space charge effects for all the operating energies, the electron beam is guided by an axial magnetic field. A detailed description of the whole apparatus has been already published [3], while in Table I the main characteristics of the device are summarized. The transverse beam temperature will be measured by means of a pair of synchronous wave pick-up matched to the electron cyclotron frequency [4], and positioned at the two ends of the straight section. The same instrument can also give the beam position, allowing the reconstruction of the electron line of flight. The longitudinal energy spread and the transverse beam density can be measured from the spectral width and relative intensity of a laser light backward scattered from the electron beam [5]. |
| 549 | 1991-05-06 | B PHYSICS AT CDF | 1991 | LNF-91-022(P).pdf | CDF COLLABORATION | An overview of the B physics results obtained by CDF is presented. During the 1988-1989 run we have collected 4.4 pb^-1 of p\\overline{p} collitions at \\sqrt{3}= 1.8 Tev. Using the J/ \\psi\\rightarrow\\mu^+\\mu^- sample the first reconstruction of exclusive B mesons decays at a hadron collider was obtained. From the inclusive electron sample and the exclusive B decays a measurement of the b quark production cross section was made and compared with the theory prediction. The e\\mu sample was used to study B\\overline{B} mixing and the \\chi parameter, averaged over B_d and B_g mesons, was measured to be \\chi = 0.176 +- 0.028 (stat) +- 0.041 (sys). |
| 584 | 1991-05-04 | FULL-POTENTIAL SCATTERED-WAVE CALCULATIONS FOR MOLECULES AND CLUSTERS: FUNDAMENTAL TESTS OF THE METHOD | 1991 | LNF-91-019.pdf | D. L. FOULIS, R. F. PETTIFER, C. R. NATOLI, M. BENFATTO | We describe the testing of a non-maffin-tin extension to the scattered-wave method (due to Natoli, Benfatto and Doniach [Phys. Rev. A 34, 4682(1986)]) for the calculation of one-electron energy eigenvalues and photoionization cross sections of molecules. For bound states the hydrogen molecular ion is used, and for continuum photoionization an ionized lithium pseudocluster is used, these being excellent tests because the analytic results are also known. Comparison of the results shows that the theory is correct and that the computational approach is feasible. |
| 582 | 1991-05-03 | LIGHT FOUR-QUARK STATES WITH J^pc=1^-- | 1991 | LNF-91-017(R).pdf | A. U. BADALYAN | The masses of P-wave q^2-q^2 states are reviewed. Starting from QCD it is shown that the interquark confining forces are not of pairwise type as it is usually suggested in potential models, but can be described by means of string junction configuration. Masses of P-wave q^2-q^2 systems obtained lie lower that it was predicted in the bag and potential models. |
| 583 | 1991-05-03 | QCD,QUARK MODEL AND DAFNE | 1991 | LNF-91-018(R).pdf | YU. A. SIMONOV | A short introduction into new nonperturbative QCD methods is given, together with a new quark model, deduced from QCD. Implications for DAPHNE experiments are discussed. |
| 547 | 1991-05-03 | REPORT FROM THE F-FACTORY WORKING GROUP | 1991 | LNF-91-020(R).pdf | R. BARBIERI, L. MAIANI, G. MARTINELLI, L. PAOLUZI, N. PAVER, R. PETRONZIO, E. REMIDDI | In 1990, a study group was formed, to provide the INFN Executive Board with an independent evaluation of the physics potential of DAPHNE, a high luminosity \\Phi-factory, besides that of measuring the direct CP-violation parameter, \\epsilon'/ \\epsilon. The study group conclusions appeared, in italian, as an internal report of the Frascati National Laboratories, LNF-90/041(R). Now that the \\Phi-factory in Frascati has been approved, experiments are being conceived and detectors designed, we thought it appropriate to make the report available to a larger community, by providing an English translation of LNF-90/041(R). The translation is due to Giuseppe Di Carlo, whom we gladly thank. We thank. in addition, Enzo Iarocci, Giulia Pancheri and Rinaldo Baldini for their encouragement and interest. |
| 3815 | 1991-04-30 | Recent Developments in the Time Analysis of Tunneling Processes | 1991 | INFN-BE_91-3.pdf | V.S. Olkhovsky E. Recami | |
| 3829 | 1991-04-24 | Design of a Reflex Time-of-Flight mass Spectrometer for the Desorption of Molecular Ions | 1991 | INFN-TC_91-5.pdf | F. Riggi | |
| 581 | 1991-04-20 | GRAN SASSO PHYSICS | 1991 | LNF-91-016.pdf | L. VOTANO | Undrground physics plays a leading role in current-day physics research and the experimentalists and theoreticians are showing a growing interest in the possibilities and availability of underground laboratories. The importance of this branch of physics and the relevant laboratories can be attributed to two main aspects: 1) Neutrino astronomy, i. e., the study of the universe using neutrinos as probes instead of the more traditional e. m. radiation in the form of visible radiation, X-rays, etc., is a new method of exploring the sky and represents a grand opportunity for physicists to further their knowledge of the universe, its origin and evolution, as well as the evolution of the stars. 2) The second aspect is connected to the study of elementary particles: physicists have long sought the unification of the forces of nature that are supposed generated by a unique force. The next objective is to unify electroweak with strong interaction, i. e., quarks with leptons. However, the energy scale for this to happen (>10^14 GeV) is not accessible to the particle accelerators either in operation or foreseeable in the near future. On the other hand, some of the predictions of the Grand Unification Theory regarding the stability of matter, the neutrino mass and the magnetic monopoles can be addressed in experiments carried out in underground laboratories which could, therefore, greatly contribute to the unification of the fundamental forces. |
| 580 | 1991-04-19 | A Pb SAMPLING e-g CALORIMETER USING GLASS SPARK COUNTERS | 1991 | LNF-91-015(P).pdf | M. ANELLI, G. BENCIVENNI, M. BENFATTO, V. CHIARELLA, G. FELICI, A. MARTINI, E. PACE, A. STECCHI, L. TRASATTI, C. GUSTAVINO | The possibility of using glass spark counters as active detectors in a Pb-sampling digital calorimeter for low energy \\gamma has been investigated. The energy response and resolution using photons ranging between 40 and 80 MeV have been measured. |
| 578 | 1991-04-17 | QUARK-GLUON ADMIXTURE IN HADRONS IN STRONG COUPLING AND SMALL VOLUME EXPANSIONS | 1991 | LNF-91-013(R).pdf | A. MOLINARI, F. PALUMBO | It is shown that in strong coupling expansions with noncompact lattice regularization as well as in the small volume expansion quarks and gluons are coupled to leading order, at variance with Wilson's strong coupling expansion. These approaches suggest that quarks and gluons contribute in comparable amount to the structure of all hadrons (there should be no glueballs) in agreement with observation about the momentum and the spin of the proton. |
| 579 | 1991-04-17 | A NEW BEAUTY FOR 'ADONE': A HIGH RESOLUTION POWDER DIFFRACTOMETER FOR SYNCHROTRON RADIATION EXPERIMENTS | 1991 | LNF-91-014(R).pdf | E. BURATTINI, G. CAPPUCCIO, P. MAISTRELLI, S. SIMEONI | A high resolution powder diffractometer connected to the wiggler magnet line BX1, is now operative at the Adone storage ring in Frascati. A Si channel-cut monochromator on the line allows operation in the range 1-3 A. To achieve the desired high resolution in the diffraction spectra, a 'triple-axis configuration' has been chosen: avertical standing \\theta/2\\theta goniometer supports a flat Ge(111) crystal analyzer on the 2\\theta arm. With this configuration, a value of less than 0.02' (degrees) for the FWHM of the diffraction peaks has been reached. The special design solutions adopted for a Seifert MZ VI goniometer and the microstep technology used in the stepper motor actuation assure a mechanical resolution better than 0.001' (degrees). A special supporting table, with six degrees of freedom, has been made for the diffractrometer orientation in front of the X-ray beam. An IBM-PC is dedicated to the diffractrometer positioning control and preliminary data collection. As a Macintosh IICX provides for the data processing, a special software package, named 'Mac Dust', has been developed and is continuosly updated. The first experimental results collected on-line during the instrument check-up are presented. |
| 3824 | 1991-04-11 | Dimensional Recurrence Formulas for Green's Functions of Cubic Lattices | 1991 | INFN-FM_91-2.pdf | E. Milotti | |
| 546 | 1991-04-08 | THE STRUCTURE OF HYDROGENATED AMORPHOUS SILICON-CARBON ALLOYS AS INVESTIGATED BY EXAFS | 1991 | LNF-91-012(P).pdf | S. PASCARELLI, F. BOSCHERINI, S. MOBILIO, F. EVANGELISTI | we ahve studied the local structure of hydrogenated amorpjous silicon-carbon alloy films, a-Si_1-xC_x:H, by measuring the extended x-ray absorption fine structure (EXAFS) at the Si K edge. We find that first coordination shell average bond lengths are 2.35 A for Si-Si and 1.86 A for Si-C and are constant with concentration to within +- 0.015 A. By comparing the composition of the first coordination shell around Si with the average concentration we show that the alloy tends to be chemically ordered, in that heteroatomic bonds are preferred. |
| 3828 | 1991-03-27 | SEV (Version 1.00) User's Guide (SEV is a tool to Select Events) | 1991 | INFN-TC_91-4.pdf | C. Strizzolo | |
| 577 | 1991-03-26 | PHYSICS OPPORTUNITIES AT DAFNE, THE FRASCATI F-FACTORY | 1991 | LNF-91-011(R).pdf | M. PICCOLO | The physics potential of a \\phi-factory is reviewed: minimum luminosity requirements for an e+e- collider are evaluated. The parameters of the Frascati based project, DAPHNE, are discussed with a preliminary construction schedule for the machine. |
| 3826 | 1991-03-21 | Neutron Background Determination in the Gran Sasso Laboratory by Means of a Novel Coincidence Neutron Spectrometer | 1991 | INFN-TC_91-2.pdf | S. Affatato A. Bertin M. Buschi D. Bulgarelli V.M. Bystritsky M. Capponi I. D'Antone S. De Castro D. Galli U. Marconi I. Massa M. Morganti C. Moroni M. Piccinini M. Poli N. Semprini-CesariM. Villa A. Vitale G. Zavattini A. Zoccoli | |
| 3827 | 1991-03-21 | Studio di Scintillatori a Stato Solido per Spettrometria Gamma | 1991 | INFN-TC_91-3.pdf | C. La Mela L. Torrisi | |
| 575 | 1991-03-20 | CHIRAL INVARIANCE ON THE LATTICE | 1991 | LNF-91-009(P).pdf | F. PALUMBO | A definition of fermions on a lattice is proposed which does not violate chiral invariance. The no-go theorem of Nielsen and Ninomiya is evaded by using a second order formalism for the fermions. |
| 3814 | 1991-03-20 | CASTM - A Computer Aided System for Thickness Measurementt of Thin Films | 1991 | INFN-BE_91-2.pdf | R. Fresca-Fantoni E.Gadioli P. Guazzoni P. Verganini F. Vettore L. Zetta P. Dellera G.P. Fattori F. Tomasi | |
| 3792 | 1991-03-20 | The strong Coupling Constant: Its Theoretical Derivation from a geometric Approach to Hadron Structure | 1991 | INFN-AE_91-3.pdf | E. Recami V. Tonin-Zanchin | |
| 574 | 1991-03-13 | COMPACT AND NONCOMPACT GAUGE THEORIES ON A LATTICE | 1991 | LNF-91-008(P).pdf | C. M. BECCHI, F. PALUMBO | A noncompact formulation of gauge theories on the lattice recently proposed makes use of auxiliary fields. We show that in such a formulation the representation of the gauge group in the case of SU(2) is completely reducible, one of the irreducible multiplets containing the Yang-Mills fields plus one auxiliary field. Elimination of this field by a gauge-invariant constraint leads to Wilson's formulation. |
| 5675 | 1991-02-22 | PROPOSED MEASUREMENT OF THE VACUUM BIREFRINGENCE INDUCED BY A MAGNETIC FIELD ON HIGH ENERGY PHOTONS. | 1991 | INFN-AE-91-2.pdf | G. Cantatore, L. Dabrowski, F. Della Valle, E. Milotti, C. Rizzo. | We propose an experimental set-up to observe and measure the interaction between high energy photons and a strong magnetic field. The successful measurement of such an effect would amount to a direct observation of QED vacuum polarization. |
| 3791 | 1991-02-22 | Proposed Measurements of the Birefringere Induced by a Magnetic Field on High Protons | 1991 | INFN-AE_91-2.pdf | G. Cantarone F. Della Valle E. Milotti L. Dabrowski G. Rizzo | |
| 3813 | 1991-02-18 | First Measurement of the Magnetic Birefringence of Helium Gas | 1991 | INFN-BE_91-1.pdf | E. Zavattini et al. | |
| 5674 | 1991-02-06 | PAIR PRODUCTION IN HEAVY-ION COLLISION: SECOND-ORDER ADIABATIC APPROXIMATION. | 1991 | INFN-AE-91-1.pdf | G. Calucci, R. Ragazzon. | The electron-positron pair production in the collision of heavy ions show a rapid raise of the rate with the total nuclear charge (~Z<sup>20</sup>). It has been shown that the gross fearures of the process are correctly reproduced by a first-order adiabatic approximation. In this paper we estimate the correction to the emission probability coming from a second-order iteration of the adiabatic treatement. The numerical results show that the correction beth to the size and to the slope of the production rate is small, if compared to the present experimental uncertainties. The first-order description is therefore confirmed. |
| 544 | 1991-02-05 | PLASTIQUE: A SYNCHROTRON RADIATION BEAMLINE FOR TIME RESOLVED FLUORESCENCE IN THE FREQUENCY DOMAIN | 1991 | LNF-91-006(IR).pdf | G. DE STASIO, N. ZEMA, A. SAVOIA, T. PARASASSI, N. ROSATO, F. ANTONANGELI | PLASTIQUE is the only synchrotron radiation beamline in the world that performs time resolved fluorescence experiments in frequency domain. These experiments are extremely valuable sources of information on the structure and dynamics of molecules. We describe the beamline and some examples of initial data. |
| 545 | 1991-02-05 | HYPPOCAMPUS: A SET OF HYPERCARD XFCN'S FOR CAMAC INTERFACE | 1991 | LNF-91-007(IR).pdf | A. MARINI, A. STECCHI, L. TRASATTI | We have implemented the standard ESONE CAMAC routines [1] as Hypercard XFCN's, using MPW 3.1 pascal[2]. This implementation (and this manual as well) are based on a set of CAMAC routines, also written in MPW PASCAL, by E. Wunsch at DESY[3]. The hardware requirements are a MAC-II with MICRON/MacVEE[4] interface ane one to eight MacCC-CAMAC-controllers[5]. In this hardware configuration all data transfers are restricted to 16 bit mode. The routines are available in a demo stack, HYPPOCAMPUS (HYPercard POwer for CAMac PUShbutton), which implements the software equivalent of the standard CAMAC Manual Controller. There is no support for LAMs yet. This work continues our attempt to use Hypercard as a powerful and simple human interface tool for data acquisition and control. See Ref.[6] for an equivalent set of routines for VME interface. |
| 572 | 1991-01-21 | EFFECTS OF GAS MIXTURE ON LIMITED STREAMER CHAMBER PERFORMANCE | 1991 | LNF-91-004(P).pdf | G. BARI, G. BRUNI, G. CARA - ROMEO, A. CONTIN, C. DEL - PAPA, G. IACOBUCCI, G. MACCARONE, D. MENCARINI, R. NANIA, G. SARTORELLI, G. ANZIVINO, S. BIANCO, R. CASACCIA, F. CINDOLO, L. DANIELLO, M. DE - FELICI, M. ENORINI, D. FABBRI, F. L. FABBRI, M. GIARDONI, I. LAAKSO, M. LINDOZZI, E. PALLANTE, L. PASSAMONTI, V. RUSSO, M. VENTURA, L. VOTANO, A. ZALLO, Y. DONG, G. Q. JI, N. I. QAZI, S. SARWAR, G. D' ALI | The large volume detector at Gran Sasso employs roughly 15.000 limited streamer chambers for its tracking system. Streamer chamber performance strongly depends upon the nature of gas mixture used to fill it. We describe a comparison between the use of the standard binary (30% argon + 70% isobutane) and a low-hydrocarbon ternary (2% argon + 10% isobutane + 88% carbon dioxide) gas mixture. The ternary mixture results in a 400 volts shorter single count rate plateau, a 20% smaller primary streamer pulse-height and a much higher streamer multiplicity. The single count rate plateau was also studied for a wide composition range for isobutane, argon and carbon dioxide mixtures. Finally the source and effect of gas impurities, on performance of chambers operated with the standard binary mixture, was also investigated. |
| 573 | 1991-01-21 | LIMITED STREAMER CHAMBER TESTING AND QUALITY EVALUATION IN ASTRA | 1991 | LNF-91-005(IR).pdf | G. BARI, G. BRUNI, G. CARA - ROMEO, A. CONTIN, C. DEL - PAPA, G. IACOBUCCI, G. MACCARONE, D. MENCARINI, R. NANIA, G. SARTORELLI, G. ANZIVINO, S. BIANCO, R. CASACCIA, F. CINDOLO, L. DANIELLO, M. DE - FELICI, M. ENORINI, D. FABBRI, F. L. FABBRI, M. GIARDONI, I. LAAKSO, M. LINDOZZI, F. MASI, E. PALLANTE, L. PASSAMONTI, S. QIAN, V. RUSSO, M. VENTURA, L. VOTANO, A. ZALLO, K. CHEN, X. CUI, B. GAO, C. JING, Y. LI, N. I. QAZI, S. SARWAR, L. TERMINIELLO, G. D' ALI | Limited streamer chambers are extensively used for high-energy and nuclear physics experiments in accelerator and underground laboratories. The tracking system of LVD, an underground experiment to study muons and neutrino astronomy, will use roughly 15.000 limited streamer chambers and 100.000 external pickup strips with digital readout electronics, In this article we discuss the different aspects of chamber operation that serve to estabilish a testing procedure and to define acceptance criteria for selecting reliable and long-life devices. The procedures and the results obtained from a long-term test to evaluate streamer chember quality, based upon a sample of 2900 items, are described. The selection tests and the long-term observations have been performed in the Astra laboratory, established at the Laboratori Nazionali di Frascati to carry out quality control procedures for streamer chambers on a large scale and in a controlled environment. |
| 3823 | 1991-01-21 | On Linear Separability of Random Subsets of Hypercube Vertices | 1991 | INFN-FM_91-1.pdf | M. Budinich | |
| 571 | 1991-01-18 | THE PHOTOMULTIPLIER GAIN MONITORING SYSTEM FOR THE E687 ELECTROMAGNETIC CALORIMETER AT FERMILAB | 1991 | LNF-91-003(P).pdf | S. BIANCO, P. CANTONI, A. COTTA-RAMUSINO, L. DANIELLO, M. ENORINI, F. L. FABBRI, P. L. FRABETTI, M. GIARDONI, V. GIORDANO, S. MENEGHINI, G. MOLINARI, L. PASSAMONTI, L. PERASSO, R. PILASTRINI, S. P. RATTI, V. RUSSO, A. SALA - GRABAR, G. SOLA, A. SPALLONE, P. TRESPI, P. VITULO, A. ZALLO | The nitrogen pulsed laser monitoring system for the Outer Electromagnetic calorimeter of the E687 photoproduction experiment, investigating charm and beauty states at the Fermilab Tevatron, is described. The system is reliable, economical and allows a photomultipliers gain stability control as good as 1%. |
| 543 | 1991-01-15 | COORDINATION BETWEEN TCP/IP PROTOCOL ON VAX AND APOLLO DOMAIN | 1991 | LNF-91-002(NT).pdf | M. L. FERRER, F. SGAMMA, J. WANG | TCP/IP protocol has defined two types of routing methods: static and dynamic. In this note we give detailes how these routing methods could be coordinated between VAX and APOLLO Domain. |
| 3825 | 1991-01-11 | La Radiologia Digitale: Approccio Sperimentale all'Immagine Plate | 1991 | INFN-TC_91-1.pdf | L.Bacarini E. Busetto R. Giacomich A. Masutti F. Tomasini | |
| 570 | 1991-01-10 | WEYL INVARIANCE OF THE GREEN-SCHWARZ HETEROTIC SIGMA MODEL | 1991 | LNF-91-001(P).pdf | S. BELLUCCI, R. OERTER | Weyl invariance at one loop is proven for the heterotic non-linear sigma model coupled to curved superspace with non-trivial fermionic and bosonic background fields. A general formula is given relating the Weyl anomaly to the sigma model \\beta-functions at arbitrary sigma-model loop order. The Weyl anomaly is also considered in the presence of Yang-Mills backgrounds. |
| 5671 | 1990-12-18 | PARASUPERSYMMETRY IN QUANTUM MECHANICS AND FIELD THEORY. | 1990 | INFN-AE-90-22.pdf | R. Floreanini, L. Vinet. | We study para-supersymmetric quantum mechanical models containing many bosonic and parafermionic variables. The extension to an infinite number of degrees of freedom naturally leads to a simple two-dimensional field theory. |
| 5672 | 1990-12-18 | q-ORTHOGONAL POLYNOMIALS AND THE OSCILLATOR QUANTUM GROUP. | 1990 | INFN-AE-90-23.pdf | R. Floreanini, L. Vinet. | The oscillator quantum algebra is shown to provide a group-theoretic setting for the q-Laguerre and q-Hermite polynomials. |
| 3749 | 1990-12-15 | Thick Target K-Alpha Yields for 66 Elements from Na to Pb Induced by 1-100 MeV Protons | 1990 | INFN-AE_90-24.pdf | L. Alvadi S. Bassi M. Milazzo M. Silari | |
| 3750 | 1990-12-15 | HEM (Version 5.00), User Guide | 1990 | C. Strizzolo | ||
| 3763 | 1990-12-14 | Stocastics Cooling of the Radial Motion in a Penning Trap | 1990 | INFN-BE_90-12.pdf | V. Lagomarsino G. Manuzio G. Testera | |
| 3764 | 1990-12-14 | Vacuum Separation Using Thin Carbon Foils | 1990 | INFN-BE_90-13.pdf | V. Lagomarsino G. Manuzio A. Pozzo G. Testera | |
| 5673 | 1990-12-14 | THICK TARGET K<sub>α</sub> X-RAY YIELDS FOR 66 ELEMENTS FROM Na TO Pb INDUCED BY 1-100 MeV PROTONS. | 1990 | INFN-TC-90-24.pdf | L. Avaldi<sup>1</sup>, S. Bassi<sup>2</sup>, M. Milazzo<sup>2</sup>, M. Silari<sup>3,4</sup>. | In the course of a feasibility study of a high intensity X-ray source to be used for XRF, the <a href='https://www.codecogs.com/eqnedit.php?latex=K_{\alpha&space;}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?K_{\alpha&space;}' title='K_{\alpha }' /></a> Xray yields produced by 1-100 MeV proton bombardment of 66 pure element targets from Na to Pb have been calculated. The report presents the analytical model used for the computer simulations. In particular, the models adopted for the calculation of the K X-ray production cross section and the stopping power are described with some detail. A set of tables with the numerical results is enclosed in the Appendix. Some comparisons with experimental results obtained in the energy range 12-38 MeV are also reported. |
| 3745 | 1990-12-03 | Fixed Target Physics at the SSC | 1990 | INFN-AE_90-20.pdf | F. Grancagnolo | |
| 3746 | 1990-12-03 | The RPC System of E771, Cosmic Rays Results | 1990 | INFN-AE_90-21.pdf | F. Grancagnolo | |
| 3762 | 1990-11-28 | GA.SP. Experiment:Project Report of Gamma Spectroscopy | 1990 | INFN-BE_90-11.pdf | D. Bazzacco F. Brandolini A. Buscemi S. Lunardi G. Nardelli G. Nebbia P. Pava C. Rossi-Alvarez C. Signorini F. Soramel R. Zanon | |
| 3742 | 1990-11-27 | The ZEUS Vertex Detector: Design and Prototype Test | 1990 | INFN-AE_90-17.pdf | C. Alvisi ...P. Giusti G. Iacobucci | |
| 3768 | 1990-11-26 | The Critical State and the Flux Dynamics in Squid Arrays | 1990 | INFN-FM_90-4.pdf | F. Parodi R. Vaccarone | |
| 3741 | 1990-11-23 | The Delphi Vertex Detector Alignment: A Pedagogical Statistical Exercise | 1990 | INFN-AE_90-16.pdf | M. Caccia A. Stocchi | |
| 5670 | 1990-11-22 | MANIFESTATIONS OF HEAVY EXTRA NEUTRAL <i>E</i><sub>6</sub> GAUGE BOSONS IN e<sup>+</sup>e<sup>-</sup> → W<sup>+</sup>W<sup>-</sup> at LEP II. | 1990 | INFN-AE-90-15.pdf | A.A. Pankov, N. Paver. | We have studied the manifestations of a new neutral gauge boson (<i>Z'</i>) with <i>M<sub>z'</sub></i> <a href="https://www.codecogs.com/eqnedit.php?latex=>&space;\sqrt{s}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?>&space;\sqrt{s}" title="> \sqrt{s}" /></a>, which might exist in <i>E</i><sub>6</sub> models, in the proceps e<sup>+</sup>e<sup>-</sup> <a href="https://www.codecogs.com/eqnedit.php?latex=\rightarrow" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\rightarrow" title="\rightarrow" /></a> W<sup>+</sup>W<sup>-</sup> at LEP II. We have found that the differential cross section is quite sensitive to the existence of a heavy <i>Z'</i>. In particular, <a href="https://www.codecogs.com/eqnedit.php?latex=d\sigma&space;/d\cos&space;\theta" target="_blank"><img src="https://latex.codecogs.com/gif.latex?d\sigma&space;/d\cos&space;\theta" title="d\sigma /d\cos \theta" /></a> should show the effect of heavier <i>Z'</i> bosons with <i>M<sub>z'</sub></i> > 350 <i>GeV</i> as an enhanced effect due to the <i>Z</i> - <i>Z'</i> mixing. |
| 3743 | 1990-11-03 | The Resistive Plate Counter Muon System of E771 | 1990 | INFN-AE_90-18.pdf | E. Gorini | |
| 3744 | 1990-11-03 | The RPC as a Muon Detector: The E771 Experience | 1990 | INFN-AE_90-19.pdf | F. Grancagnolo | |
| 3738 | 1990-10-31 | Spin in Antinucleon Physics | 1990 | INFN-AE_90-13.pdf | F. Bradamante | |
| 5668 | 1990-10-31 | SPIN IN ANTINUCLEON PHYSICS. | 1990 | INFN-AE-90-13.pdf | Franco Bradamante. | Recent antiproton-proton data, mostly coming from the Low-Energy Antiproton Ring, LEAR, at CERN, are illustrated and their trend discussed. The data are compared with one-boson-exchange models to extract the global behaviour of annihilation. Some ideas for future measurements and developments are presented. Les donnees antiproton-proton obtenues en grande majorite a l' Anneau de stockage d'antiprotons a basse energie du CERN, LEAR, sont illustrees et discutees. Ces donnees sont comparees aux previsions des modeles potentiels avec echange de bosons, dans le but d'obtenir les caracteristiques globales des processus d'annihilation. Enfin, des idees de mesures futures et de developpements sont presentees. |
| 5669 | 1990-10-31 | NEW QUANTUM GROUP AND HYPERPLANE FROM WZW AND TODA MODELS. | 1990 | INFN-AE-90-14.pdf | Ludwik Dabrowski. | A new quantum group and the calculus on quantum hyperplane is described, which are associated to R-matrix describing the braiding of certain chiral Toda fields. The classical limit of these structures relates to Poisson brackets of certain chiral WZW fields. |
| 3789 | 1990-10-29 | Multidimensional Simulations of the ELFA Superradiant Free-Electron Laser | 1990 | INFN-TC_90-21.pdf | P. Pierini W.M. Fawley W.M. Sharp | |
| 3737 | 1990-10-26 | Low-Energy and High Energy Calibration of the LVD Liquid Scintillation Counters in the Gran Sasso Laboratory | 1990 | INFN-AE_90-12.pdf | R. Bertoni W. Fulgione P. Galeotti A. Giuliano N.Mengotti Silvia G.C. Trincheto C. Ricci S. Santini | |
| 3788 | 1990-10-26 | Study on Thin-Film Thermopiles in Microcalorimeter Applications | 1990 | INFN-TC_90-20.pdf | L. Brunetti F. Face G. Gervino M. Icardi E. Monticone | |
| 3787 | 1990-10-10 | Probing the Environment with Accelerator-Based Techniques | 1990 | INFN-TC_90-19.pdf | C. Tuniz F. Zanini K.W. Jones | |
| 3786 | 1990-10-05 | Comments on the Proposed XUV FEL at the Ares Linac | 1990 | INFN-TC_90-18.pdf | R. Bonifacio | |
| 5667 | 1990-10-03 | PROPAGATION OF A POLARIZED LASER BEAM IN A STATIC TRANSVERSE PSEUDOSCALAR FIELD. | 1990 | INFN-AE-90-11.pdf | G. Cantatore, P. Micossi , C. Rizzo, G. Ruoso, E. Zavattini. | We will investigate in this report the situation arising when a linearly polarized laser light beam traverses a region where an almost static pseudoscalar field <a href="https://www.codecogs.com/eqnedit.php?latex=\vec{E}_{a}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\vec{E}_{a}" title="\vec{E}_{a}" /></a> is present. This field is defined by <a href="https://www.codecogs.com/eqnedit.php?latex=\vec{E}_{a}=grad\Phi&space;_{a}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\vec{E}_{a}=grad\Phi&space;_{a}" title="\vec{E}_{a}=grad\Phi _{a}" /></a>, (1) where <a href="https://www.codecogs.com/eqnedit.php?latex=\Phi&space;_{a}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\Phi&space;_{a}" title="\Phi _{a}" /></a> is the pseudo scalar potential; one possible origin of such a potential will be discussed below. The interaction Lagrangian between the pseudoscalar potential and the electromagnetic field is expressed by the term<sup>*)</sup> <a href="https://www.codecogs.com/eqnedit.php?latex=L=\frac{1}{M}\vec{E}\cdot&space;\vec{B}\Phi&space;_{a}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?L=\frac{1}{M}\vec{E}\cdot&space;\vec{B}\Phi&space;_{a}" title="L=\frac{1}{M}\vec{E}\cdot \vec{B}\Phi _{a}" /></a>, (2) where <a href="https://www.codecogs.com/eqnedit.php?latex=\vec{E}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\vec{E}" title="\vec{E}" /></a> and <a href="https://www.codecogs.com/eqnedit.php?latex=\vec{B}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\vec{B}" title="\vec{B}" /></a> are the electric and magnetic field vectors of the light wave and M is a parameter (I/M=g<sub>aγγ</sub>) which characterizes the strength of the photon-photon-pseudoscalar field coupling. We will restrict ourselves to the case of a light beam propagating for a distance <i>l</i> in a static transverse pseudoscalar field <a href="https://www.codecogs.com/eqnedit.php?latex=\vec{E}_{a}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\vec{E}_{a}" title="\vec{E}_{a}" /></a>, and determine the changes that will occur, due to the interaction term (2), in the light polarization state and in the light propagation vector. The potential <a href="https://www.codecogs.com/eqnedit.php?latex=\Phi&space;_{a}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\Phi&space;_{a}" title="\Phi _{a}" /></a> in equation (1) can be interpreted as being due to the existence of light pseudoscalar particles such as the axion [1,2,3], the arion [4,5] or the maioron [6]. Present limits for the mass m<sub>a</sub> of these hypothetical particles range around m<sub>a</sub><a href="https://www.codecogs.com/eqnedit.php?latex=\leq" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\leq" title="\leq" /></a>10<sup>-3</sup> eV. Physical effects due to the real presence of a pseudoscalar field could in practice arise in experimental apparati realized to detect small changes in the polarization state of a light beam in presence of a strong static magnetic field B<sub>o</sub> caused by vacuum fluctuation phenomena in Q.E.D. [7,8] or by an interaction term of the type shown in equation (2) [9]. In these experiments a strong transverse magnetic field, throught which the light beam is sent, is generally provided by a coil surrounded by a soft iron yoke for the purpose of field containment. A magnetization is therefore induced in the soft iron, and the oriented electron spins could be, according to ref. [10], a source for the pseudoscalar field. In the following we will assume the mass m<sub>a</sub> of the pseudoscalar field sufficiently small and apply the formalism of ref. [10] to have a real quantitative example of the field <a href="https://www.codecogs.com/eqnedit.php?latex=\vec{E}_{a}" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\vec{E}_{a}" title="\vec{E}_{a}" /></a> generated in the mentioned experimental set-up. |
| 3785 | 1990-09-28 | Sviluppo di un Sistema di Alimentazione ad Alta Tensione, per Rilevatori Gassosi | 1990 | INFN-TC_90-17.pdf | S. Minutoli | |
| 3761 | 1990-09-19 | Un Semplice Monitor per Misurare l'Intensita' Totale di un Fascio di Fotoni di Energia Intermedia | 1990 | INFN-BE_90-10.pdf | M. Anghinolfi A. Rottura | |
| 3784 | 1990-09-19 | A Fastbus Monitor System for the Digital Streamer Tubes Electronics in SLD | 1990 | INFN-TC_90-16.pdf | G. Bilei B. Checcucci | |
| 3783 | 1990-09-17 | Doubly Bent Crystals for X Ray Microfocusing Applications: Calculations of the Energy Bandpass | 1990 | INFN-TC_90-15.pdf | F. Zontone C. Tuniz F. Zanini | |
| 5666 | 1990-09-17 | A FASTBUS MODULE FOR TRIGGER APPLICATIONS BASED ON A DIGITAL SIGNAL PROCESSOR AND ON PROGRAMMABLE GATE ARRAYS. | 1990 | INFN-AE-90-10.pdf | P. Battaiotto, A. Colavita, F. Fratnik, L. Lanceri. | The new generation of DSP microprocessors based on RISC and Harvard-like architectures can conveniently take the place of specially built processors in fast trigger circuits for High Energy Physics experiments. Presently available Programmable Gate Arrays are well matched to them in speed and contribute to simplify the design of trigger circuits. Using these components, we designed and constructed a Fastbus module. We describe an application for the total energy trigger of DELPHI, performing the read-out of digitized calorimeter trigger data and some simple computations in less than 3 ms. |
| 5665 | 1990-09-14 | EXPERIMENTAL TRENDS IN <span style='text-decoration: overline'>N</span>N SCATTERING. | 1990 | INFN-AE-90-9.pdf | F. Bradamante. | Recent antiproton-proton data, mostly on spin observables, are illustrated and their trend discussed. The data are compared with one-boson-exchange models to extract the global behaviour of annihilation. Some ideas for future measurements and developments are presented. |
| 3782 | 1990-09-10 | A Theoretical Analysis of the Response of a Double Balanced Mixer for Linearity mprovement of Phase Detection | 1990 | INFN-TC_90-14.pdf | A. Gallo A. Bosotti L. Ferrucci C. Pagani | |
| 5664 | 1990-08-29 | REMARKS ON THE QUANTUM GROUP STRUCTURE OF THE RATIONAL c < 1 CONFORMAL THEORIES. | 1990 | INFN-AE-90-8.pdf | P. Furlan, A.Ch. Ganchev, V.B. Petkova. | The rational c < 1 theories are reconsidered beyond the space of BRST states, allowing for intermediate states not contained in the Kac table. The intertwining properties of the screening charges <i>Q</i><sub><i>m</i></sub>, <i>Q</i><sub><i>p-m</i></sub> are used to derive linear relations for the general conformal blocks. The fusion rules are recovered on BRST states, combining these relations with previously obtained identities for the fusion matrices, due to the corresponding <i>U</i>(<i>sl</i>(2))-invariant operators. The extended formulation is applied to give meaning for <i>q</i><sup>p</sup> = 1 to the quantum group covariant conformal correlations initiated by Moore and Reshetikhin. The correlations are manifestly covariant under the action of the <i>R</i>-matrix and in the diagonal case they coincide with the averages of the screened vertices, recently proposed by Gomez and Sierra. |
| 3760 | 1990-07-30 | A Special Purpose Parallel-to-Serial bidirectinal interface | 1990 | INFN-BE_90-9.pdf | W. Bragagnini P. Guazzoni M. Pitalieri G. Taiocchi L. Zetta | |
| 3759 | 1990-07-26 | Computation Logic Unit for a Micro-programmed Data Acquisition System: An Evaluation Prototype | 1990 | INFN-BE_90-8.pdf | W. Bragagnini P. Guazzoni M. Pitalieri L. Zetta | |
| 3767 | 1990-07-12 | Elastic Recoil Detection Analysis (ERDA) of Ion Irradiated Polymers | 1990 | INFN-FM_90-3.pdf | L. Torrisi | |
| 3732 | 1990-07-10 | Studies of a B-Physics with FNAL E771 | 1990 | INFN-AE_90-7.pdf | F. Grancagnolo | |
| 3781 | 1990-06-29 | Properties of Ruthenium Oxide Resistors as Sensitive Elements of Composite Bolometers | 1990 | INFN-TC_90-13.pdf | R. D'Ambra G. Gallinaro F. Gatti S. Vitale | |
| 5663 | 1990-06-25 | LEPTONIC DECAY CONSTANTS OF HEAVY FLAVOUR MESONS OF ARBITRARY MASS. | 1990 | INFN-AE-90-6.pdf | C.A. Dominguez, N. Paver. | Leptonic decay constants of heavy flavour pseudoscalar and vector mesons of arbitrary mass are estimated in the framework of QCD sum rules. Predictions are compared with the scaling laws of the quark model. |
| 3731 | 1990-06-25 | Leptonic Decay Constants of Heavy Flavour Mesons of Arbitrary Mass | 1990 | INFN-AE_90-6.pdf | C.A. Dominguez N.Paver | |
| 3758 | 1990-06-25 | Particle Detection Efficiency in a Multiring Trap | 1990 | INFN-BE_90-7.pdf | V. Lagomarsino G. Manuzio G. Testera | |
| 3757 | 1990-06-14 | A mixer unit for data aquisition | 1990 | INFN-BE_90-6.pdf | P. Guazzoni G.F. TaiocchiL. Zetta | |
| 3766 | 1990-06-07 | Feed Forward Neutral Networks: A Geometrical Perspective | 1990 | INFN-FM_90-2.pdf | M. Budinich E. Milotti | |
| 5662 | 1990-05-30 | ON THE Φ → K<sup><small>O</small></sup>-<span style='text-decoration: overline'>K</span><sup><small><span style='text-decoration: overline'>O</span></small></sup>γ TRANSITION AT A Φ FACTORY. | 1990 | INFN-AE-90-5.pdf | N. Paver, Riazuddin. | We estimate the branching ratio of <a href='https://www.codecogs.com/eqnedit.php?latex=\phi&space;\rightarrow&space;K^{o}\bar{K}^{\bar{o}}\gamma' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\phi&space;\rightarrow&space;K^{o}\bar{K}^{\bar{o}}\gamma' title='\phi \rightarrow K^{o}\bar{K}^{\bar{o}}\gamma' /></a> by including a non-resonant smooth amplitude in addition to the scalar resonance poles. This transition is relevant to precision measurements of CP-violating parameters in the kaon system at a <a href='https://www.codecogs.com/eqnedit.php?latex=\phi' target='_blank'><img src='https://latex.codecogs.com/gif.latex?\phi' title='\phi' /></a>-factory, which have been recently proposed. |
| 3779 | 1990-05-29 | Shok: Sub-Harmonic High-Gain Optical Klystron | 1990 | INFN-TC_90-11.pdf | L. Serafini P. Michelato C. Pagani A. Perretti | |
| 3780 | 1990-05-29 | Study on Silicon Detectors K | 1990 | INFN-TC_90-12.pdf | G. Gervino E. Bagnolatti M. Boero F. Fasce M. Icardi A. Gabutti C. Manfredotti E. Monticone | |
| 3778 | 1990-05-02 | Numerical Simulations for the ARES Superconducting Low Emittance Injector | 1990 | INFN-TC_90-10.pdf | L. Serafini P. Michelato C. Pagani A. Perretti | |
| 3777 | 1990-05-02 | Sistema di Test per le Schede di Read-out delle Strip Usate nell'Esperimento 'MACRO' presso I Laboratori Nazionali del Gran Sasso | 1990 | INFN-TC_90-9.pdf | A. Boiano A. Candela A. Perricone | |
| 3728 | 1990-04-27 | Sensitivity to Mixing and CP Violation in the B°- antiB° System by Decay Distribution Study | 1990 | INFN-AE_90-3.pdf | C. Biino S. Palestrini | |
| 3776 | 1990-04-27 | Calculation of the Effective Critical Field of the Cable for LHC Dipole Magnets | 1990 | INFN-TC_90-8.pdf | P. Fabbricatore R. Musenich R. Parodi | |
| 5660 | 1990-04-27 | 'MULTI-PARTON INTERACTIONS AND INELASTIC CROSS SECTION IN HIGH ENERGY HADRONIC COLLISION'. | 1990 | INFN-AE-90-2.pdf | G. CALUCCI, D. TRELEANI. | We discuss the leading contribution of multiple semi-hard partonic interactions to the inelastic cross section in high energy hadronic collisions. Two parton correlations are explicitly taken into account and shown to give a negligible contribution to the integrated cross section. |
| 5676 | 1990-04-16 | MINIJETS: TRANSVERSE ENERGY FLOW IN VERY-HIGH-ENERGY NUCLEAR COLLISION. | 1990 | INFN-AE-91-4.pdf | G. Calucci, D. Treleani. | We estimate the transverse energy produced by semi-hard partonic interactions in nuclear collisions at c.m. energies of the order of one TeV per nucleon. Keeping properly into account multiple partonic interactions the transverse energy spectrum has no longer any power divergence for small values of the cut off <a href='https://www.codecogs.com/eqnedit.php?latex=p_{t}^{min}' target='_blank'><img src='https://latex.codecogs.com/gif.latex?p_{t}^{min}' title='p_{t}^{min}' /></a> which separates the semi-hard region from the soft one. |
| 3775 | 1990-04-11 | Generatore A B F per test di fili di camere a drift | 1990 | INFN-TC_90-7.pdf | A. Bove F. Manna A. Parmentola | |
| 3774 | 1990-04-10 | 'Misure preliminari su RFQ di Trieste' | 1990 | INFN-TC_90-6.pdf | A. Fabris R. Kersevan A. Massarotti M. Puglisi C. Rossi G. Torelli | |
| 5661 | 1990-04-09 | q-OSCILLATOR REALIZATIONS OF THE QUANTUM SUPERALGEBRAS sl<sub>q</sub>(m,n) AND osp<sub>q</sub>(m,2n). | 1990 | INFN-AE-90-4.pdf | R. Floreanini, V.P. Spiridonov, L. Vinet. | Realizations of the quantum superalgebras corresponding to the <i>A</i>(<i>m,n</i>), <i>B</i>(<i>m,n</i>), <i>C</i>(<i>n</i> + 1) and <i>D</i>(<i>m,n</i>) series are given in terms of the creation and annihilation operators of <i>q</i>-deformed Bose and Fermi oscillators. |
| 3773 | 1990-03-26 | Un amplificatore NIM ad otto canali, a 300 MHz a basso costo | 1990 | INFN-TC_90-5.pdf | L. Caiazzo G. Manto L. Parascandolo | |
| 3756 | 1990-03-20 | Nuclear fusion experiment in Pd charged by deuterium Gas | 1990 | INFN-BE_90-5.pdf | S. Aiello E. De Filippo G. Lanzanò S. Lo Nigro A. Pagano | |
| 3772 | 1990-02-27 | OSCAR2D User's Guide | 1990 | INFN-TC_90-4.pdf | P. Fernandes R. Parodi | |
| 3771 | 1990-02-20 | The Designed of TE Storage Cavities for a RF Pulse Compressor System | 1990 | INFN-TC_90-3.pdf | P. Fernandes R. Parodi C. Salvo B. Spataro | |
| 3755 | 1990-02-13 | The importance of Nucleon-Nucleon Interactions in Nuclear Reactions | 1990 | INFN-BE_90-4.pdf | E. Gadioli | |
| 685 | 1990-02-07 | Gauge Invariance on the Lattice with non Compact Gauge Field | 1990 | LNF-90-8(PT).pdf | F. PALUMBO | An action is constructed which 1S gauge invariant on the lattice with noncompact gauge fields. It requires the introduction of auxIiary fields which disappear in the continuum limit. |
| 3753 | 1990-01-25 | Jacobian's Inflluence in the d+7Li Æ a+a+n reaction | 1990 | INFN-BE_90-2.pdf | F. Bonsignore P. D'Agostino A. D'Arrigo G. Fazio G. Giardina S. Interdonato A. Italiano A. Taccon R. Palamara | |
| 3754 | 1990-01-25 | The Ablation Stage in the fast Abrasion Model | 1990 | INFN-BE_90-3.pdf | G. Lanzanò A. Pagano E. De Filippo R. Dayras R. Legrain | |
| 3765 | 1990-01-22 | Auger Electron spectroscopy analysis of oxides | 1990 | INFN-FM_90-1.pdf | L. Torrisi | |
| 3770 | 1990-01-20 | Un convertitore analogico digitale a quattro canali in standard VME | 1990 | INFN-TC_90-2.pdf | G. Bassato R. Bassini C. Boiano R. Ponchia | |
| 634 | 1990-01-17 | ARES Design Study - The Machine | 1990 | LNF-90-5(P).pdf | S. Tazzari, C. Pagani, G. Vignola, M. Bassetti, C. Biscari, R. Boni, U. Gambardella, S. Guiducci, S. Kulinski, L. Palumbo, C. Sanelli, L. Serafini, N. Cavallo, M. Serio, L. Trasatti, P. Amadei, M. Castellano, A. Cattoni, V. Chimenti, P. Michelato, M. Piccolo, M. Preger, F. Tazzioli, S. De Simone, A. Aragona, M. Barone, S. Bartalucci, M.E. Biagini, F. Cevenini, D. Di Gioacchino, G. Di Pirro, S. Faini, G. Felici, M. Ferrario, A. Ghigo, S. Gallo, M. R. Masullo, G. Modestino, R. Parodi, P. Patteri, A. Peretti, G. Raffone, F. Sgamma, B. Spataro, C. Vaccarezza, M. Vescovi, L. Ferrucci | |
| 3752 | 1990-01-11 | Alfa Scattering and Excitation of Isoscalar Giant Resonances in the Interacting Boson Model | 1990 | INFN-BE_90-1.pdf | L. Zuffi G. Maino A. Ventura | |
| 3726 | 1990-01-10 | 'Dark Matter' in our Universe | 1990 | INFN-AE_90-1.pdf | P. Belli, M. Scafi A. Incicchitti | |
| 3769 | 1990-01-02 | Principle and evolution of the cyclotron | 1990 | INFN-TC_90-1.pdf | M. Silari | |
| 681 | 1990-00-00 | NUCLEAR PHYSICS AT FRASCATI WITH INTERNAL TARGETS | 1990 | LNF_90_001(P).pdf | E. DE SANCTIS, M. ANGHINOLFI, N. BIANCHI, P. CORVISIERO, S. FRULLANI, G. GARIBALDI, G. GERVINO, C. GUARALDO, P. LEVI SANDRI, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, G. RICCO, M. SANZONE, P. ROSSI, M. TAIUTI, G. M. URCIOLI, A. ZUCCHIATTI | |
| 682 | 1990-00-00 | PHENOMENOLOGICAL EVIDENCE FOR A THIRD RADIAL EXCITATION OF r(770) | 1990 | LNF_90_002(PT).pdf | M. E. BIAGINI, S. DUBNICKA, E. ETIM, P. KOLAR | |
| 683 | 1990-00-00 | MOMENTUM DISTRIBUTION AND TWO-BODY SHORT RANGE CORRELATIONS IN ^16O(e,e'p) | 1990 | LNF_90_003(P).pdf | G. P. CAPITANI, M. BERNHEIM, M. K. BRUSSEL, A. CATARINELLA, L. CHINITZ, J. F. DANEL, E. DE SANCTIS, S. FRULLANI, F. GARIBALDI, F. GHIO, M. JODICE, J. M. LE GOFF, J. LE ROSE, A. MAGNON, C. MARCHAND, R. MINEHART, J. MERGENSTERN, J. MOUGEY, S. NANDA, C. PERDRISAT, J. PICARD, R. J. POWERS, V. PUNJABI, A. SAHA, P. ULMER, P. VERNIN, A. ZGHICHE | |
| 633 | 1990-00-00 | ARES PHI-FACTORY INJECTION: ELECTRON AND POSITRON GENERATION | 1990 | LNF_90_004(R).pdf | C. Biscari, R. Boni, M. Castellano, M. Chimenti, S. Kulinski, B. Spataro, F. Tazzioli, M. Vescovi | |
| 635 | 1990-00-00 | EXACT EVALUATION OF THE FADDEEV-POPOV DETERMINANT IN A COMPLETE AXIAL GAUGE ON A TORUS | 1990 | LNF_90_006(RT).pdf | F. Palumbo | |
| 684 | 1990-00-00 | KAON PHYSICS AT A F-FACTORY | 1990 | LNF_90_007(R).pdf | R. BALDINI - CELIO, M. E. BIAGINI, S. BIANCO, F. BOSSI, M. SPINETTI, A. ZALLO, S. DUBNICKA | |
| 636 | 1990-00-00 | IL MODELLATORE SOLIDO 3D-PSM ITALCAD | 1990 | LNF_90_009(NT).pdf | A. Beatrici, F. Sgamma | |
| 686 | 1990-00-00 | IL PROGETTO JET-TARGET SU ADONE | 1990 | LNF_90_010(P).pdf | M. ANGHINOLFI, N. BIANCHI, P. CORVISIERO, E. DE SANCTIS, S. FRULLANI, F. GARIBALDI, G. GERVINO, C. GUARALDO, P. LEVI SANDRI, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, G. RICCO, P. ROSSI, M. SANZONE, M. TAIUTI, G. M. URCIOLI, A. ZUCCHIATTI | |
| 637 | 1990-00-00 | SPIN: A STANDARD FORMAT FOR INFN LNF INTERNAL REPORTS | 1990 | LNF_90_011(NT).pdf | L. INVIDIA, L. TRASATTI, A. STECCHI | |
| 687 | 1990-00-00 | JET INCLUSIVE PRODUCTION TO 0(a^3_s): COMPARISON WITH DATA | 1990 | LNF_90_012(PT).pdf | F. AVERSA, M. GRECO, P. CHIAPPETTA, J. Ph. GUILLET | |
| 638 | 1990-00-00 | DRAFTING DEL S7000 - ITALCAD - VERSIONE 2.1 | 1990 | LNF_90_013(NT).pdf | A. BEATRICI, F. SGAMMA | |
| 688 | 1990-00-00 | STRUCTURE OF ORIENTED V_2O_5 GEL STUDIED BY POLARIZED X-RAY ABSORPTION SPECTROSCOPY AT THE VANADIUM K EDGE | 1990 | LNF_90_014.pdf | S. STIZZA, G. MANCINI, M. BENFATTO, C. R. NATOLI, J. GARCIA, A. BIANCONI | |
| 689 | 1990-00-00 | ALL YOU NEED TO KNOW ABOUT CHIRAL BOSONS | 1990 | LNF_90_015(PT).pdf | S. BELLUCCI | |
| 639 | 1990-00-00 | X-VUV POSSIBLE FEL EXPERIMENTS WITH THE ARES SC LINAC | 1990 | LNF_90_016(R).pdf | L. SERAFINI, M. FERRARIO, C. PAGANI, A. GHIGO, P. MICHELATO, A. PERETTI | |
| 690 | 1990-00-00 | RESULTS OF THE Ist GENERATION EXPERIMENTS, AT GRAN SASSO UNDERGROUND LABORATORY, ON NUCLEAR COLD FUSION | 1990 | LNF_90_017.pdf | F. CELANI, M. DE FELICI, F.L. FABBRI, L. LIBERATORI, A. SAGGESE, A. SPALLONE, V. DI STEFANO, P. MARINI, S. PACE, S. BIANCO, L. DONATI | |
| 640 | 1990-00-00 | STRUCTURAL INVESTIGATION OF A-Si AND a-Si: H USING X-RAY-ABSORPTION SPECTROSCOPY AT THE Si K EDGE | 1990 | LNF_90_018.pdf | A. FILIPPONI, F. EVANGELISTI, M. BENFATTO, S. MOBILIO, C. R. NATOLI | |
| 641 | 1990-00-00 | Proposal of Measuring the Mechanisms of Nuclear Excitation Leading to Fission with the Adone Jet-Target Tagged Photon Beam | 1990 | LNF_90_019(R).pdf | V. Lucherini, N. Bianchi, E. De Sanctis, C. Guaraldo, P. Levi Sandri, V. Muccifora, E. Polli, A. R. Reolon, P. Rossi, S. Aiello, E. De Filippo, G. Lanzano', S. Lo Nigro, C. Milone, A. Pagano, A. S. Botvina, A. S. Ilijonov, M. V. Mebel | |
| 691 | 1990-00-00 | CONTRIBUTIONS OF OFF-SHELL TOP QUARKS TO DECAY PROCESSES | 1990 | LNF_90_020(PT).pdf | A. GRAU, G. PANCHERI, R. J. N. PHILLIPS | |
| 692 | 1990-00-00 | NEW LANGUAGES, HYPERCARD AND ADONE | 1990 | LNF_90_021(R).pdf | L. TRASATTI | |
| 693 | 1990-00-00 | INTERNAL TARGET EFFECTS IN THE ADONE STORAGE RING | 1990 | LNF_90_022(P).pdf | V. MUCCIFORA, M. ANGHINOLFI, N. BIANCHI, P. CORVISIERO, E. DE SANCTIS, P. LEVI SANDRI, V. LUCHERINI, E. POLLI, A.R. REOLON, G. RICCO, G. ROSSI, M. TAIUTI, G. M. URCIOLI, A. ZUCCHIATTI | |
| 694 | 1990-00-00 | WiZard: A PROGRAM TO MEASURE COSMIC-RAY ANTIPROTONS AND POSITRONS, AND SEARCH FOR PRIMORDIAL ANTIMATTER | 1990 | LNF_90_023.pdf | R. L. GOLDEN, S. P. AHLEN, J. J. BEATTY, H.J. CRAWFORD, P. J. LINDSTROM, J. F. ORMES, R. E. STREITMATTER, C. R. BOWER, R. M. HEINZ, S. MUFSON, T. G. GUZIK, P. J. WEFEL, S. A. STEPHENS, J .H. ADAMS, K. E. KROMBEL, A. J. TYLKA, M. SIMON, K. E. MATHIS, P. PICOZZA, G. BARBIELLINI, G. BASINI, F. BONGIORNO, M. RICCI, A. CODINO, C. DE MARZO, B. MANAGELLI, P. GALEOTTI, P. SPILLANTINI, M. BOCCIOLINI | |
| 695 | 1990-00-00 | BUNCH LENGTH MEASUREMENT SYSTEM IN THE INJECTOR SECTION OF THE SC LINAC LISA | 1990 | LNF_90_024(R).pdf | C. BISCARI, R. BONI, M. CASTELLANO, A. GALLO, B. SPATARO | |
| 642 | 1990-00-00 | SCATTERING INCLUSIVO DI ELETTRONI DALLA JET-TARGET IN ADONE: INTERESSE FISICO E STUDIO DI FATTIBILITA' DELL'ESPERIMENTO | 1990 | LNF_90_026(R).pdf | M. ANGHINOLFI, N. BIANCHI, M. BOGLIARDI, M. RIPANI, P. CORVISIERO, E. DE SANCTIS, G. GERVINO, P. LEVI, SANDRI, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, G. RICCO, M. TAIUTI, A. ZUCCHIATTI | |
| 697 | 1990-00-00 | FREQUENCY AND FIELD DEPENDENCE OF THE A.C.MAGNETIC SUSCEPTIBILITY OF YBCO PELLETS FABRICATED BY A CITRATE PYROLYSIS AND OZONE ANNEALING | 1990 | LNF_90_027(P).pdf | F. CELANI, L. LIBERATORI, S. PACE, B. POLICHETTI, A. SAGGESE, A. SPALLONE | |
| 643 | 1990-00-00 | U-SPIN CONSIDERATIONS TO GUESS THE UNKNOWN TIME-LIKE NEUTRON FORM FACTORS | 1990 | LNF_90_028(P).pdf | M. E. BIAGINI, E. PASQUALUCCI, A. ROTONDO | |
| 645 | 1990-00-00 | CONSOLE SOFTWARE DESIGN FOR THE LISA ACCELERATOR CONTROL SYSTEM | 1990 | LNF_90_030(NT).pdf | C. MILARDI | |
| 646 | 1990-00-00 | Proposal for a f-Factory | 1990 | LNF_90_031(R).pdf | M. Greco, M. Giorgi, M. Piccolo, R. Baldini - Celio, M. E. Biagini, S. Bianco, F. Bossi, A. Calcaterra, R. De Sangro, P. De Simone, S. Dubnicka, A. Ghigo, I. Peruzzi, C. Sanelli, M. Spinetti, A. Zallo | |
| 647 | 1990-00-00 | THE ARGON CLUSTERS-BEAM INSTALLED IN THE ADONE STORAGE RING | 1990 | LNF_90_032(P).pdf | M. TAIUTI, E. DURANTE, M. ANGHINOLFI, N. BIANCHI, P. CORVISIERO, E. DE SANCTIS, G. GERVINO, C. GUARALDO, P. LEVI SANDRI, V. LUCHERINI, L. MATTERA, V. MUCCIFORA, E. POLLI, A. R. REOLON, G. RICCO, P. ROSSI, M. SANZONE, G. M. URCIOLI, U. VALBUSA, A. ZUCCHIATTI | |
| 648 | 1990-00-00 | AUTOMATIC CONTROL AND MONITORING OF A SET OF STEERING COILS FOR THE LNF LINAC | 1990 | LNF_90_033(NT).pdf | L. TRASATTI, L. CATANI, O. COIRO, G. DI PIRRO, C. MILARDI, M. SERIO, A. STECCHI | |
| 698 | 1990-00-00 | FURTHER MEASUREMENTS ON ELECTROLYTIC COLD FUSION WITH D2O AND PALLADIUM AT GRAN SASSO LABORATORY | 1990 | LNF_90_034(P).pdf | F. CELANI, A. SPALLONE, S. PACE, B. POLICHETTI, A. SAGGESE, L. LIBERATORI, V. DI STEFANO, P. MARINI | |
| 649 | 1990-00-00 | THE ARES SUPERCONDUCTING LINAC | 1990 | LNF_90_035(R).pdf | P. AMADEI, A. ARAGONA, M. BARONE, S. BARTALUCCI, M. BASSETTI, M. E. BIAGINI, C. BISCARI, R. BONI, M. CASTELLANO, A. CATTONI, N. CAVALLO, F. CEVENINI, V. CHIMENTI, S. DE SIMONE, D. DI GIOACCHINO, G. DI PIRRO, S. FAINI, G. FELICI, M. FERRARIO, L. FERRUCCI, S. GALLO, U. GAMBARDELLA, A. GHIGO, S. GUIDUCCI, S. KULINSKI, M. R. MASULLO, P. MICHELATO, C. MILARDI, M. MINESTRINI, G. MODESTINO, C. PAGANI, L. PALUMBO, R. PARODI, P. PATTERI, A. PERETTI, M. PREGER, G. RAFFONE, C. SANELLI, L. SERAFINI, M. SERIO, F. SGAMMA, B. SPATARO, L. TRASATTI, F. TAZZIOLI, C. VACCAREZZA, M. VESCOVI, G. VIGNOLA | |
| 699 | 1990-00-00 | JET PRODUCTION IN HADRONIC COLLISIONS TO O(a3s) | 1990 | LNF_90_036.pdf | F. AVERSA, M. GRECO, P. CHIAPPETTA, J. PH. GUILLET | |
| 700 | 1990-00-00 | STUDY OF PENETRATING COSMIC RAY MUONS AND SEARCH FOR LARGE SCALE ANISOTROPIES AT THE GRAN SASSO LABORATORY | 1990 | LNF_90_037(P).pdf | MACRO COLLABORATION | |
| 650 | 1990-00-00 | A STUDY OF SHORT-TERMS RATE EFFECT IN PHILIPS XP-2008 PHOTOMULTIPLIERS TUBES | 1990 | LNF_90_038(R).pdf | S. BIANCO, F. L. FABBRI, A. SPALLONE, A. ZALLO | |
| 701 | 1990-00-00 | DIAMAGNETIC PROPERTIES OF SUPERCONDUCTING GRANULAR SYSTEMS | 1990 | LNF_90_040(P).pdf | S. PACE, A. SAGGESE, R. DE LUCA, L. LIBERATORI, F. CELANI | |
| 652 | 1990-00-00 | RELAZIONE DEL GRUPPO DI STUDIO SULLA F-FACTORY | 1990 | LNF_90_041(R).pdf | R. BARBIERI, L. MAIANI, G. MARTINELLI, L. PAOLUZI, N. PAVER, R. PETRONZIO, E. REMIDDI | |
| 653 | 1990-00-00 | PONTECORVO REACTIONS OF TWO-BODY ANNIHILATIONS PD AND P ^3He AND MULTIQUARK STATES IN D AND ^3He | 1990 | LNF_90_042(P).pdf | L. KONDRATYUK, G. GUARALDO | |
| 702 | 1990-00-00 | ANALYTICAL CALCULATION OF THE IMPENDANCE OF A DYSCONTINUITY | 1990 | LNF_90_043.pdf | L. Palumbo | |
| 703 | 1990-00-00 | ANTINUCLEON-NUCLEUS PHYSICS: EXPERIMENTAL OVERVIEW | 1990 | LNF_90_044(P).pdf | C. Guaraldo | |
| 654 | 1990-00-00 | SEMI-PONTECORVO REACTION p^3He --> p^- pp AND MULTIQUARK STATES IN HELIUM-3 | 1990 | LNF_90_045(P).pdf | C. GUARALDO, L. KONDRATYUK | |
| 655 | 1990-00-00 | LIOUVILLE REALIZATION OF W-ALGEBRAS | 1990 | LNF_90_046(PT).pdf | S. BELLUCCI, E. IVANOV | |
| 656 | 1990-00-00 | UTILIZZO DEI BOTTONI ALL'INTERNO DEL S7000 ITALCAD | 1990 | LNF_90_047(NT).pdf | A. Beatrici | |
| 704 | 1990-00-00 | CONTRIBUTION OF QUARK ANTI-QUARK ANNIHILATION TO THE PRODUCTION OF VIRTUAL Z^o PAIRS IN HADRON COLLISION | 1990 | LNF_90_048(PT).pdf | G. PANCHERI, A. GRAU, Y. N. SRIVASTAVA | |
| 705 | 1990-00-00 | TWO- LOOP QED CORRELATIONS TO BHABHA SCATTERING NEAR THE Zo | 1990 | LNF_90_049(PT).pdf | F. AVERSA, M. GRECO, G. MONTAGNA, O. NICROSINI | |
| 706 | 1990-00-00 | TOWARDS A PRECISE DETERMINATION OF THE ORDER OF THE PHASE TRANSITION IN COMPACT PURE GAUGE QED | 1990 | LNF_90_050.pdf | V. AZCOITI, G. DI CARLO, A. F. GRILLO | |
| 657 | 1990-00-00 | SIGNAL AND NOISE IN A HOMOGENEOUS, HIGH Z, LIQUID CALORIMETER | 1990 | LNF_90_051(R).pdf | P. Franzini | |
| 707 | 1990-00-00 | SIMULATION OF ATMOSPHERIC CASCADES AND DEEP UNDERGROUND MUONS | 1990 | LNF_90_052(P).pdf | C. FORTI, H. BILOKON, B. D'ETTORRE, PIAZZOLI, T. K. GAISSER, L. SATTA, T. STAVEN | |
| 708 | 1990-00-00 | FREQUENCY LOCK IN HIGH-Q RESONANT CAVITY TESTS | 1990 | LNF_90_053(NT).pdf | A . Gallo | |
| 658 | 1990-00-00 | THE RF SYSTEM OF THE FRASCATI LISA 1 MeV INJECTOR | 1990 | LNF_90_054(P).pdf | P. BALDINI, R. BONI, F. LUCIBELLO, A. GALLO, S. QUAGIA, F. TAZZIOLI | |
| 709 | 1990-00-00 | On the Nonperturbative Solution of d=1 Superstring | 1990 | LNF_90_055(PT).pdf | S. BELLUCCI, T. R. GOVINDRAJAN, A. KUMAR, R. N. OERTER | |
| 710 | 1990-00-00 | EFFECTIVE ACTION APPROACH TO THE GREEN-SCHWARZ STRING | 1990 | LNF_90_056(PT).pdf | S. Bellucci | |
| 659 | 1990-00-00 | THE CASE FOR F-FACTORY | 1990 | LNF_90_057(P).pdf | M. Piccolo | |
| 660 | 1990-00-00 | MEASUREMENTS ON THE NEW INJECTION SYSTEM OF THE FRASCATI LINAC | 1990 | LNF_90_058(R).pdf | C. BISCARI, S. KULINSKI, B. SPATARO, F. TAZZIOLI, M. VESCOVI | |
| 711 | 1990-00-00 | A RING-CAVITY FOR A QUADRUPLED Nd-YAG LASER | 1990 | LNF_90_059.pdf | G. GIORDANO, G. MATONE | |
| 661 | 1990-00-00 | HARGD'S LAYOUT(HIGH ANGULAR RESOLUTION GAMMA DETECTOR) DELL'ESPERIMENTO OBELIX | 1990 | LNF_90_060(NT).pdf | A. BATTISTI, B. DULACH, D. ORECCHINI | |
| 712 | 1990-00-00 | GLASS ELECTRODE SPARK COUNTERS | 1990 | LNF_90_061(P).pdf | M. ANELLI, G. BENCIVENNI, G. FELICI, L. MAGRO | |
| 714 | 1990-00-00 | MAGIC-ANGLE THEOREM IN POWDER X-RAY-ABSORPTION SPECTROSCOPY | 1990 | LNF_90_063.pdf | R .F. PETTIFER, C. BROUDER, M. BENFATTO, C. R. NATOLI, C. HERMES, M. F. RUIZ LOPEZ | |
| 715 | 1990-00-00 | SEARCH FOR ANTIMATTER. GOALS AND TECHNIQUES | 1990 | LNF_90_064.pdf | G. BASINI, P. SPILLANTINI | |
| 662 | 1990-00-00 | MULTICHANNEL MULTIPLE-SCATTERING THEORY WITH GENERAL POTENTIALS | 1990 | LNF_90_065.pdf | C. R. NATOLI, M. BENFATTO, C. BROUDER, M. F. RUIZ LOPEZ, D. L. FOULIS | |
| 716 | 1990-00-00 | SIMULTANEOUS OBSERVATION OF EXTENSIVE AIR SHOWERS AND UNDERGROUND MUONS AT THE GRAN SASSO LABORATORY | 1990 | LNF_90_066.pdf | V. PATERAMACRO and EAS-TOP COLLABORATION | |
| 663 | 1990-00-00 | The Injector of the Superconducting Linac LISA | 1990 | LNF_90_067(P).pdf | A. Aragona, C. Biscari, R. Boni, M. Castellano, N. Cavallo, F. Cevenini, V. Chimenti, G. P. Di Pirro, A. Gallo, A. Ghigo, F. Giacco, S. Kulinki, P. Patteri, B. Spataro, F. Tazzioli, M. Vescovi | |
| 717 | 1990-00-00 | THEORETICAL CALCULATION OF X-RAY ABSORPTIONS NEAR EDGE STRUCTURE AT Sr K-EDGE IN La_2-xSr_xCuO_4 COMPOUNDS | 1990 | LNF_90_068(PT).pdf | Z. Y. WU, M. BENFATTO, C. R. NATOLI | |
| 664 | 1990-00-00 | CRYOGENIC REFRIGERATION OF THE LISA SUPERCONDUCTING CAVITIES | 1990 | LNF_90_069(NT).pdf | R. CECCARELLI, M. DE GIORGI, D. DI GIOACCHINO, U. GAMBARDELLA, C. VACCAREZZA | |
| 666 | 1990-00-00 | INFORMAZIONI E CRITERI DI SCELTA DEI MISURATORI DI PORTATA PER IMPIANTI SPERIMENTALI | 1990 | LNF_90_071(NT).pdf | A. CECCHETTI, S. CERIONI, B. DULACH | |
| 748 | 1990-00-00 | The Discretization of d=2 Surfaces and Supersymmetry Invariance | 1990 | LNF_90_073(PT).pdf | S. Bellucci | |
| 669 | 1990-00-00 | VALUTAZIONE DI HARDWARE E SOFTWARE DI COLLEGAMENTO TRA RETI APPLETALK ETHERNET | 1990 | LNF_90_076(NT).pdf | O. CIAFFONI, M. MARSELLA | |
| 670 | 1990-00-00 | DESCRIZIONE E PROGETTO DI UNA RETE LOCALE IN AMBIENTE DIVERSIFICATO MEDIANTE L'UTILIZZO DEL PRODOTTO DECLANWORKS | 1990 | LNF_90_077(NT).pdf | O. CIAFFONI, M. MARSELLA | |
| 671 | 1990-00-00 | NOTE SUL MONITORAGGIO AMBIENTALE DEI NEUTRONI NEI LNF | 1990 | LNF_90_078(R).pdf | A. ESPOSITO, C. NUCCETELLI, M. PELLICCIONI, C. MANFREDOTTI, A. ZANINI | |
| 673 | 1990-00-00 | DC FEATURES AND RF LOSSES ON Nb-BASED SUPERCONDUCTING THIN FILM | 1990 | LNF_90_080(P).pdf | D. DI GIOACCHINO, P. FABBRICATORE, S. FRIGERIO, U. GAMBARDELLA, R. MUSENICH, R. PARODI, G. PATERNO', S. RIZZO, C. VACCAREZZA | |
| 674 | 1990-00-00 | PRODUCTION OF W_R AND W_1 BOSONS FROM SUPERSTRING-INSPIRED E_6 MODEL AT HADRON COLLIDERS | 1990 | LNF_90_081(PT).pdf | F. AVERSA, S. BELLUCCI, M. GRECO, P. CHIAPPETTA | |
| 719 | 1990-00-00 | STATUS REPORT OF THE IR FEL PROJECT ON THE SC LINAC LISA AT FRASCATI | 1990 | LNF_90_082(P).pdf | M. CASTELLANO, A. GHIGO, P. PATTERI, C. SANELLI, F. TAZZIOLI, N. CAVALLO, F. CEVENINI, F. CIOCCI, G. DATTOLI, A. DI PACE, G. P. GALLERANO, A. RENIERI, E. SABIA, A. TORRE | |
| 675 | 1990-00-00 | REALIZZAZIONE DI UNA CAVITA' ACCELERANTE A 500 MHz IN Nb/Cu PRESSO L'ANSALDO-ABB COMPONENTI | 1990 | LNF_90_083(NT).pdf | A. BIXIO, M. MINESTRINI, C. PAGANI, F. TERZI | |
| 676 | 1990-00-00 | THE BGO COLLABORATION PROGRESS REPORT 1990 | 1990 | LNF_90_084(R).pdf | M. ANGHINOLFI, D. BABUSCI, V. BELLINI, N. BIANCHI, L. CASANO, P. CORVISIERO, A. D'ANGELO, E. DE SANCTIS, S. FRULLANI, F. GARIBALDI, G. GERVINO, B. GIROLAMI, P. LEVI - SANDRI, V. LUCHERINI, L. MAZZASCHI, V. MUCCIFORA, P. PICOZZA, E. POLLI, A. R. REOLON, G. RICCO, M. RIPANI, P. ROSSI, M. SANZONE, C. SCHAERF, M. L. SPERDUTO, M. TAIUTI, G. M. URCIOLI, A. ZUCCHIATTI, M. ALBICOCCO, M. CASTOLDI, E. CIMA, E. DURANTE, L. FALCO, G. GIULIANO, M. IANNARELLI, A. MACIOCE, G. NOBILI, A. ORLANDI, F. PARODI, W. PESCI, E. TURRI, A. ROTTURA, A. VITICCHIE' | |
| 720 | 1990-00-00 | HZ -->gg 1^+1^-:A POSSIBILITY FOR AN EXTREMELY HIGH LUMINOSITY COLLIDER | 1990 | LNF_90_085(PT).pdf | A. GRAU, T. HAN, G. PANCHERI | |
| 721 | 1990-00-00 | Flux Creep in Josephson Junction Array | 1990 | LNF_90_086(P).pdf | S. Pace, A. Saggese, R. De Luca, F. Celani, L. Liberatori | |
| 722 | 1990-00-00 | WORMHOLES AND CHARGED PARTICLES | 1990 | LNF_90_087(PT).pdf | S. BELLUCCI, D. O' REILLY | |
| 723 | 1990-00-00 | SIMULATING LATTICE FERMIONS BY MICROCANONICALLY AVERAGING OUT THE NON LOCAL DEPENDENCE OF THE FERMIONIC ACTION. | 1990 | LNF_90_088(PT).pdf | V. AZCOITI, A. CRUZ, G. DI CARLO, A. F. GRILLO, A. VLADIKAS | |
| 677 | 1990-00-00 | THE S.C.I.C. DETECTOR & Co: E.M. CALORIMETRY AT THE FRASCATI F-FACTORY | 1990 | LNF_90_089(R).pdf | S. BIANCO, F.L. FABBRI, M. GIARDONI, L. PASSAMONTI, V. RUSSO, A. ZALLO | |
| 678 | 1990-00-00 | APPLICATION OF A COMPLEX POTENTIAL TO THE INTERPRETATION OF XANES SPECTRA THE CASE OF Na K-EDGE IN NaCl | 1990 | LNF_90_090.pdf | R. GUNNELLA, M. BENFATTO, A. MARCELLI, C. R. NATOLI | |
| 680 | 1990-00-00 | A MULTIPLE SCATTERING SCHEME WITH COMPLEX POTENTIAL FOR STRUCTURAL ANALYSIS OF X-RAY ABSORPTION SPECTRA IN CONDENSED MATTER | 1990 | LNF_90_092.pdf | M. BENFATTO | |
| 724 | 1990-00-00 | FULL-POTENTIAL SCATTERED-WAVE XANES CALCULATIONS FOR CHROMIUM HEXACARBONYL | 1990 | LNF_90_093.pdf | D. L. FOULIS, R. F. PETTIFER, C. R. NATOLI, M. BENFATTO | |
| 725 | 1990-00-00 | FULL MULTIPLE SCATTERING THEORY APPLIED TO THE DETERMINATION OF PHOTOELECTRON MEAN-FREE PATH IN ZINCBLENDE AND SILICON | 1990 | LNF_90_094.pdf | PH. SAINCTAVIT, J. PETIAU, M. BENFATTO, C. R. NATOLI | |
| 726 | 1990-00-00 | EXACT SPHERICAL WAVE ANALYSIS OF XAFS IN TRANSITION METALS OCTAHEDRAL WATER COMPLEXES INCLUDING MULTIPLE SCATTERING | 1990 | LNF_90_095.pdf | M. SANCHEZ DEL RIO, J. GARCIA, E. BURATTINI, M. BENFATTO, C. R. NATOLI | |
| 727 | 1990-00-00 | K-XANES OF HIGHLY IONIC MATERIALS | 1990 | LNF_90_096.pdf | R. GUNNELLA, M. BENFATTO, C. R. NATOLI, A. MARCELLI | |
| 728 | 1990-00-00 | THEORETICAL ANALYSIS OF THE XANES OF SiO2 GLASSES AT THE OXYGEN AND SILICON K-EDGE | 1990 | LNF_90_097.pdf | M. BENFATTO, A. GARGANO | |
| 729 | 1990-00-00 | EXTENDED X-RAY BREMSSTRAHLUNG ISOCHROMAT FINE STRUCTURE OF PALLADIUM ANALYSED BY USING THE EXAFS METHOD | 1990 | LNF_90_098.pdf | E. SOBCZAK, S. MOBILIO | |
| 730 | 1990-00-00 | X-RAY LITHOGRAPHY AT FRASCATI: FIRST RESULTS | 1990 | LNF_90_099.pdf | E. BURATTINI, A. BALERNA, E. BERNIERI, S. SIMEONI, A. GRILLI, L. MASTROGIACOMO, M. GENTILI, A. RACO, K. SHIXIU | |
| 731 | 1990-00-00 | DESIGN MANUFACTORING AND TEST OF A S.C. WIGGLER FACILITY FOR "ADONE" IN FRASCATI | 1990 | LNF_90_100.pdf | M. BARONE, A. CATTONI, G. MODESTINO, M. PERRELLA, C. SANELLI | |
| 732 | 1990-00-00 | IMPROVED PERFORMANCE OF THE DRIFTCHAMBER DETECTOR AT ADONE WIGGLER | 1990 | LNF_90_101.pdf | A. LA MONACA, E. BURATTINI, G. CAPPUCCIO, J. S. SHAH, S. SIMEONI, A. STECCHI, L. TRASATTI | |
| 733 | 1990-00-00 | INSTRUMENTATION FOR MAPPING STRUCTURAL AND TEXTURAL CHANGES IN FIBRES WITH STRESS BY WIDE AND LOW ANGLE DIFFRACTION AT FRASCATI | 1990 | LNF_90_102.pdf | J. S. SHAH, A. LA MONACA, A. STECCHI, L. TRASATTI, E. BURATTINI | |
| 734 | 1990-00-00 | X-RAY ABSORPTION SPECTROSCOPY: THE THREE-BODY CORRELATION FUNCTION IN AMORPHOUS SILICON | 1990 | LNF_90_103.pdf | A. FILIPPONI, A. DI CICCO, M. BENFATTO, C. R. NATOLI | |
| 735 | 1990-00-00 | EXAFS DETERMINATION OF THE LOCAL BONDING CONFIGURATION OF P IN a Si:H | 1990 | LNF_90_104.pdf | F. BOSCHERINI, S. MOBILIO, F. EVANGELISTI, A. M. FLANK | |
| 736 | 1990-00-00 | DETENCTION OF STRUCTURAL VARIATIONS IN DIFFERENT AMORPHOUS SILICON SAMPLES | 1990 | LNF_90_105.pdf | A. DI CICCO, A. FILIPPONI, A. BIANCONI | |
| 737 | 1990-00-00 | XANES AND EXAFS STUDY OF AR AND XE BEARING SiO_2 GLASSES | 1990 | LNF_90_106.pdf | M. R. CARROLL, E. PARIS, I. DAVOLI | |
| 738 | 1990-00-00 | ON THE LOCAL STRUCTURE OF SUPERIONIC GLASSES STUDIED BY X-RAY ABSORPTION SPECTROSCOPY | 1990 | LNF_90_107.pdf | G. DALBA, P. FORNASINI, F. ROCCA, E. BURATTINI | |
| 739 | 1990-00-00 | EXAFS STUDY OF (Fe_x Co_1-x) 75 Si_15 B_10 METALLIC GLASSES | 1990 | LNF_90_108.pdf | S. MOBILIO, M. L. FDEZ-GIUBIEDA | |
| 740 | 1990-00-00 | XANES AND EXAFS STUDY OF ELECTRONIC STRUCTURE AND ORDERING IN V_20_5-Te0_2 SYSTEM | 1990 | LNF_90_109.pdf | K.B. Garg, K.V.R. Rao, H. S. Chauhan, R. K. Singhal, A. Marcelli, I. Davoli, A. Bianconi | |
| 741 | 1990-00-00 | LOCAL STRUCTURE OF AMORPHOUS TUNGSTEN OXIDE THIN FILMS AND MULTILAYERS | 1990 | LNF_90_110.pdf | A. BALERNA, E. BERNIERI, E. BURATTINI, A. KUZMIN, J. PURANS | |
| 742 | 1990-00-00 | INFLUENCE OF ORDER-DISORDER TRANSITION ON VALENCE BAND STRUCTURE IN MoNi3 ALLOYS | 1990 | LNF_90_111.pdf | K. LAWNICZAK-JABLONSKA, S. MOBILIO, J. INOUE, K. TOHYAMA | |
| 743 | 1990-00-00 | POLARIZED Cu L_3 X-RAY ABSORPTION EDGE OF Bi_2Ca_2Sr_2Cu_3O_10+d SUPERCONDUCTORS | 1990 | LNF_90_112.pdf | A. BIANCONI, P. CASTRUCCI, M. DE SIMONE, A. FABRIZI, M. POMPA, A. MARCELLI, A. M. FLANK, P. LAGARDE | |
| 744 | 1990-00-00 | TEMPERATURE DEPENDENCE OF THE EXAFS DEBYE-WALLER FACTORS OF AgI | 1990 | LNF_90_113.pdf | G. DALBA, P. FORNASINI, F. ROCCA, S. MOBILIO | |
| 745 | 1990-00-00 | INTERACTION OF PROBES WITH MICELLES. AN X-RAY ABSORPTION STUDY | 1990 | LNF_90_114.pdf | A. BALERNA, E. BERNIERI, E. BURATTINI, P. D'ANGELO, E. GIGLIO, N. V. PAVEL | |
| 746 | 1990-00-00 | QUANTITATIVE MEASUREMENT BY XANES OF THE CU SITE AXIAL DISTORTION IN Cu(II)-ATP COMPLEXES | 1990 | LNF_90_115.pdf | L. PALLADINO, S. DELLA LONGA, M. BELLI, A. SCAFATI, G. ONORI, A. SANTUCCI, A. BALERNA, E. BERNIERI | |
| 747 | 1990-00-00 | DUALITY TRANSFORMATION OF THE ONE DIMENSIONAL SUPERSYMMETRIC STRING | 1990 | LNF_90_116(PT).pdf | S. Bellucci | |
| 3710 | 1989-12-22 | Nucleon-Nucleon interactions in heavy ion reactions | 1989 | INFN-BE_89-7.pdf | E. Gadioli E. Gadioli Erba | |
| 3703 | 1989-12-13 | Quantum Groups, and Fusion Rules Multiplicities | 1989 | INFN-AE_89-15.pdf | P. Furlan A.Ch.Gamcheu V.B. Petkova | |
| 5659 | 1989-12-13 | QUANTUM GROUPS AND FUSION RULES MULTIPLICITIES. | 1989 | INFN-AE-89-15.pdf | P. Furlan, A.Ch. Ganchev, V.B. Petkova. | We perform explicitly a truncation of the tensor product of two regular representations of <i>U</i><sub>q</sub>(g) for <i>q</i> a root of unity and show that it coincides with the fusion rules for integrable representations in a WZW theory based on the affine Lie algebra <i>g</i><sup>(1)</sup>. We obtain a new formula for the multiplicities which may be useful in practical calculations and which generalizes a classical formula of Weyl. |
| 3709 | 1989-11-27 | Photon Scattering from Proton in the D Region | 1989 | INFN-BE_89-6.pdf | G.P. Capitani L. Casano A.R. Reolon M. Sanzone A. Zucchiatti | |
| 3702 | 1989-11-21 | Role of B-Meson Semileptonic Form Factors in B°-B° Mixing and in B-S Transitions. | 1989 | INFN-AE_89-14.pdf | N. Paver | |
| 3712 | 1989-11-20 | RF Surface Resistence Measurements of High Tc Superconducting Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O Samples | 1989 | INFN-FM_89-2.pdf | P. Fabbricatore R. Musenich R. Parodi S. Scianca | |
| 783 | 1989-11-09 | RAPPORTO ATTIVITA' 1988 | 1989 | LNF_89_084.pdf | Curato dal Servizio Documentazione | |
| 3701 | 1989-11-08 | Unusual Black-Holes: About Some Stable (Non-Evaporating) Extremal Solutions of Einstein Equations. | 1989 | INFN-AE_89-13.pdf | E. Recami V. Tonin-Zanchin | |
| 3725 | 1989-11-07 | Prove di Fotomoltiplicatori da Impiegare in uno Spettrometro in BGO a Grande Angolo Solido | 1989 | INFN-TC_89-13.pdf | C Bernini M. Castoldi G. Gervino A. Rottura F. Terzi A. Zucchiatti | |
| 3700 | 1989-11-06 | Fifth force, sixth force, and all that: A theoretical (classical) comment | 1989 | INFN-AE_89-12.pdf | E. Recami V. Tonin-Zanchin | |
| 3724 | 1989-10-25 | Analog control loops for the Milan K800 cyclotron RF system | 1989 | INFN-TC_89-12.pdf | A Bosotti M. Di Giacomo A. Gallo G. Pagani | |
| 3699 | 1989-10-18 | Looking for a Light Higgs Boson in phi and psi Radiative decays | 1989 | INFN-AE_89-11.pdf | N. Paver, Riazzudin | |
| 3723 | 1989-10-18 | Physics and thermodynamic Data of n-n-Pentane, n-Hexane and Pseudocumene | 1989 | INFN-TC_89-11.pdf | V. Chiarella A. Falgiani | |
| 3698 | 1989-10-11 | Leptonic and Semileptonic D-Decays from QCD Sum Rules | 1989 | INFN-AE_89-10.pdf | N. Paver | |
| 3708 | 1989-09-28 | Integrated trigger for nuclear acquisition data - TINA | 1989 | INFN-BE_89-5.pdf | C. Calì F. Ferrera | |
| 3722 | 1989-09-25 | L'absorbimetria ossea quantitativa con raggi X in doppia energia (Comparazione delle caratteristiche di tre diverse apparecchiature) | 1989 | INFN-TC_89-10.pdf | L. Baccarini R. Giacomich C. Saccavini | |
| 3697 | 1989-09-25 | Fast trigger for beauty hadroproduction study | 1989 | INFN-AE_89-9.pdf | G. Dardo L. Rossi | |
| 3696 | 1989-09-20 | Extended U(1) conformal field theories in two dimensions | 1989 | INFN-AE_89-8.pdf | P. Furlan R.R. Paunov I.T. Todorov | |
| 3719 | 1989-09-01 | Vacuum and gas flow control system for a MWPC and an axial chamber | 1989 | INFN-TC_89-7.pdf | R. Bassini C. Boiano S. Brambilla M. Malatesta E. Fioretto | |
| 3720 | 1989-09-01 | A DSP based processor for high rate data analysis and reduction | 1989 | INFN-TC_89-8.pdf | A. Lanza M. Caresana | |
| 3721 | 1989-09-01 | Liquid Xenon as a detector medium | 1989 | INFN-TC_89-9.pdf | A. Incicchitti . Belli M. Scafi | |
| 3695 | 1989-08-31 | Simultaneous observation of extensive air showers and underground muons at the Gran Sasso Laboratory | 1989 | INFN-AE_89-7.pdf | MACRO and EASTOP Collaboration | |
| 3711 | 1989-07-24 | Study of niobium nitrides for supercondicting R.F. cavities | 1989 | INFN-FM_89-1.pdf | P. Fabbricatore P. Fernandes G.C. Gualco F. Merlo R. Musenich R. Parodi | |
| 3694 | 1989-07-24 | The outer tracking detectors for the E760 experiment at Fermilab | 1989 | INFN-AE_89-6.pdf | G. Barisone A. Buzzo M. Dameri S. Ferrori M. Macrì S. Minutoli C. Patrignani M.G. Pia P. Poggi A. Santroni | |
| 3718 | 1989-07-24 | Critical current measurements of s/c cables for hera dipole magnets using the facility MA.RI.S.A. | 1989 | INFN-TC_89-6.pdf | P. Fabbricatore R. Musenich R. Parodi R. Vaccarone | |
| 3717 | 1989-07-20 | A. synchtron radiation miucroprobe for X-ray fluorescence and microtomography at elettra. Applications in life science | 1989 | INFN-TC_89-5.pdf | C. Tuniz R. Devoti G. Santoro F. Zanini | |
| 3692 | 1989-07-14 | Minijets: cross section and energy distrubution in very high energy nuclear collision | 1989 | INFN-AE_89-4.pdf | G. Calucci D. Treleani | |
| 3716 | 1989-07-14 | Status report on: the use of synchrotron radiation in digital mammograophy | 1989 | INFN-TC_89-4.pdf | A. Barbiellini P. Bregant E. Castelli P. Ciuti L. Dalla Palma R. Giacomich G. Gozzi F. De Guarrini A. Penzo P.G. Rancoita A. Rindi F. Stac ul G. Tromba S. Vitale | |
| 3693 | 1989-07-14 | Exclusive B into S rare decays of beauty | 1989 | INFN-AE_89-5.pdf | C.A. Dominguez Riazuddin | |
| 3714 | 1989-06-13 | Extended verification of two conjectures on prime numbers | 1989 | INFN-TC_89-2.pdf | A De Angelis F. Gonnella M. Penzo | |
| 3715 | 1989-06-13 | Sistema di selezione per il controllo di contatori di veto | 1989 | INFN-TC_89-3.pdf | G. Liguori P. Torre R. Nardò | |
| 3691 | 1989-04-28 | Fusion matrice and C less than 1 (quasi) local conformal | 1989 | INFN-AE_89-3.pdf | P. Furlan A.Ch. Ganchev V.B. Petkova | |
| 3707 | 1989-02-23 | Probin the nucleus | 1989 | INFN-BE_89-4.pdf | W.M. Alberico R. Cenni A. Molinari | |
| 3706 | 1989-02-22 | Generalised exciton model theories for the description of pre-equilibrium angular distributions | 1989 | INFN-BE_89-3.pdf | E. Gadioli | |
| 3713 | 1989-02-21 | A QBUS-VMEBUS Adapter | 1989 | INFN-TC_89-1.pdf | I. D'Antone P. Matteuzzi S. Meneghini G. Sanzani | |
| 3705 | 1989-02-20 | A new method to measure the gravitational acceleration of the antiproton at very low energies | 1989 | INFN-BE_89-2.pdf | S. Scuri | |
| 5658 | 1989-01-23 | A CAPACITIVE DISPLACEMENT MEASURING SYSTEM FOR THE DELPHY MICROVERTEX DETECTOR. | 1989 | INFN-AE-89-1.pdf | N. Radaelli, R. Turchetta. | The physical and technical motivations and the working principles of a Capacitive Displacement Measuring System (CDMS) for the Delphi Microvertex Detector are presented. The design, based on a Monte Carlo simulation, is illustrated. Experimental tests, perfomed both in laboratory and during a test beam, show the system should be able to monitor the displacements of the detector in space within a few microns accuracy. |
| 3689 | 1989-01-13 | Strategies for filling the longitudinal phase space in the injection into a booster proton synchrotron at very high intensity currents | 1989 | INFN-AE_89-2.pdf | M. Leo R.A. Leo G. Mancarella G. Soliani M. Pusterla | |
| 3704 | 1989-01-09 | A stretcher and holder module | 1989 | INFN-BE_89-1.pdf | P. Guazzoni G. Taiocchi L. Zetta | |
| 788 | 1989-00-00 | OPERATION OF LIMITED STREAMER TUBES WITH LOW HYDROCARBON CONTENT GAS MIXTURES USING NEON AS NOBLE GAS | 1989 | LNF_89_001(P).pdf | A. ANTONELLI, R. BALDINI - CELIO, G. BENCIVENNI, F. BOSSI, P. CAMPANA, G. CAPON, V. CHIARELLA, B. D' ETTORE PIAZZOLI, G. FELICI, P. LAURELLI, G. MANNOCCHI, F. MURTAS, G. P. MURTAS, G. NICOLETTI, P. PICCHI, H. RIGONI | |
| 789 | 1989-00-00 | POLARIZZAZIONE DEL FASCIO DI FOTONI MARCATI DELL'ESPERIMENTO JET-TARGET (Studio di Fattibilita') | 1989 | LNF_89_002(R).pdf | N. BIANCHI, V. MUCCIFORA | |
| 790 | 1989-00-00 | SULLA GEOMETRIA DEI MONOCROMATORI PER RAGGI X A DOPPIA RIFLESSIONE | 1989 | LNF_89_003(NT).pdf | E. BERNIERI | |
| 753 | 1989-00-00 | EXCITATION AND IONIZATION IN LOW Z ATOMS BY SLOW MAGNETIC MONOPOLES | 1989 | LNF_89_004(P).pdf | V. PATERA | |
| 754 | 1989-00-00 | ICARUS I: AN OPTIMIZED, REAL TIME DETECTOR OF SOLAR NEUTRINOS | 1989 | LNF_89_005(R).pdf | L. BASSI, P. CENNINI, S. CITTOLIN, A. DI CIACCIO, A. GONIDEC, L. MAZZONE, R. MUNOZ, Th. MULLER, G. MURATORI, C. RUBBIA, D. SCHINZEL, W. SCHMIDT, E. BUNCKLEY, O. CIAFFONI, A. CIOCIO, G. DI PIRRO, M. PALLOTTA, P. PICCHI, L. TRASATTI, G. PIANO MORTARI, M. BALDO-CEOLIN, A. BETTINI, A. BRAGGIOTTI, S. CENTRO, P. CASOLI, B. DAINESE, F. DAL CORSO, F. GASPARINI, H. HUZITA, F. PIETROPAOLO, P. ROSSI, S. SUZUKI, M. CHENG, D. CLINE, J. PARK, M. ZHOU | |
| 791 | 1989-00-00 | RAY TRACING RESULTS FOR A MONOCHROMATOR ON THE SCOW SUPERCONDUCTING WIGGLER BEAMLINE | 1989 | LNF_89_006(R).pdf | F. BOSCHERINI, A. SAVOIA, M. SANCHEZ DEL RIO | |
| 792 | 1989-00-00 | LISA UNDULATOR PROJECT | 1989 | LNF_89_007(R).pdf | C. SANELLI | |
| 793 | 1989-00-00 | A MODEL OF DIFFRACTION SCATTERING WITH UNITARITY CORRECTIONS | 1989 | LNF_89_008(PT).pdf | E. ETIM, A. MALECKI, L. SATTA | |
| 794 | 1989-00-00 | GEOMETRICAL INTERPRETATION OF BREMSSTRAHLUNG EFFECTS IN HADRON-HADRON COLLISIONS | 1989 | LNF_89_009(PT).pdf | A. GRAU, G. PANCHERI, Y.N. SRIVASTAVA | |
| 795 | 1989-00-00 | AN OBSERVATION OF LEADING MESON IN p+Ne REACTION AT 607 MeV/c INCIDENT MOMENTUM | 1989 | LNF_89_010.pdf | F. BALESTRA, S. BOSSOLASCO, M.P. BUSSA, L. BUSSO, L. FERRERO, D. PANZIERI, G. PIRAGINO, F. TOSELLO, R. BARBIERI, G. BENDISCIOLI, A. ROTONDI, P. SALVINI, A. ZENONI, Yu A. BATUSOV, U.V. FALOMKIN, G.B. PONTECORVO, M.G. SAPOZHNIKOV, V.I. TRETYARK, J.M. OLSEN, F.O. BREIVIK, T. JACOBSEN, S.O. SORENSEN | |
| 796 | 1989-00-00 | GIFT:A MULTIPLE GATEWAY FOR FILE TRANSFER, ACCESS, AND MANAGEMENT | 1989 | LNF_89_011(P).pdf | M.L. FERRER, E. PACE, G. MIRABELLI, E. VALENTE, F. FLUCKIGER, G. HEIMAN | |
| 797 | 1989-00-00 | A NEW VDM PREDICTION FOR TIME-LIKE FORM FACTORS | 1989 | LNF_89_013(PT).pdf | E. ETIM, S. DUBNICKA | |
| 798 | 1989-00-00 | CONSISTENT CHIRAL BOSONIZATION WITH ABELIAN AND NON-ABELIAN GAUGE SYMMETRIES | 1989 | LNF_89_014(PT).pdf | S. BELLUCCI, M.F.L. GOLTERMAN, D.N. PETCHER | |
| 799 | 1989-00-00 | USE OF LARGE SIZE STREAMER TUBES IN COSMIC RAY EXPERIMENTS | 1989 | LNF_89_015(P).pdf | M. ANELLI, G. BATTISTONI, G. BENCIVENNI, P. CAMPANA, U. DENNI, G. DE NINNO, P. LAURELLI, P. PICCHI, B. D'ETTORE PIAZZOLI, A. CAMPOS FAUTH, G. MANNOCCHI | |
| 800 | 1989-00-00 | THE MACRO EXPERIMENT AT GRAN SASSO UNDERGROUND LABORATORY | 1989 | LNF_89_016(P).pdf | MACRO COLLABORATION PRESENTED BY M. SPINETTI | |
| 756 | 1989-00-00 | BIDIMENSIONAL FIT TO DEUTERON PHOTODISINTEGRATION CROSS SECTION VALUES BETWEEN 20 AND 440 MeV | 1989 | LNF_89_017(P).pdf | P. ROSSI, E. DE SANCTIS, P. LEVI SANDRI, N. BIANCHI, C. GUARALDO, V. LUCCHERINI, V. MUCCIFORA, E. POLLI, A.R. REOLON, G.M. URCIOLI | |
| 749 | 1989-00-00 | RF TEST OF 6 GHz SUPERCONDUCTING CAVITY AT LNF | 1989 | LNF_89_018(R).pdf | R. BONI, A. SAVOIA, B. SPARTARO, F. TAZZIOLI, P. FABBRICATORE, R. PARODI, P. FERNANDES | |
| 801 | 1989-00-00 | B MESON LIFETIME MEASUREMENT | 1989 | LNF_89_019(P).pdf | M. PICCOLO | |
| 803 | 1989-00-00 | "TRANSVERSE BETATRON TUNE MEASUREMTS" | 1989 | LNF_89_021(P).pdf | M. SERIO | |
| 804 | 1989-00-00 | ANALYTIC REGULARIZATION OF INVERSION TRANSFORM INTEGRALS BY CESARO SUMMABILITY | 1989 | LNF_89_022(PT).pdf | E. ETIM, M. PALLOTTA, C. BASILI | |
| 805 | 1989-00-00 | NUCLEON FORM FACTORS IN A VMD MODEL WITH BOTH Q^2 AND S-CHANNEL DUALITY | 1989 | LNF_89_023(PT).pdf | E. ETIM, A. MALECKI | |
| 750 | 1989-00-00 | A BALLOON FLIGHT FROM AN ANTARCTIC BASE TO GET THE BEST CONDITIONS IN THE SEARCH FOR COSMIC ANTIPROTONS | 1989 | LNF_89_024.pdf | G. BASINI, F. BONGIORNO, A. MORSELLI, M. OCCHIGROSSI, M. RICCI, P. SPILLANTINI, YI - F. WANG, R. BERNABEI, M. P. DE PASCALE, P. PICOZZA, A. CODINO, M. MICHELLI, C. GRIMANI, I. SALVATORI, A. MARINO | |
| 806 | 1989-00-00 | COHERENT STATES AND STRUCTURE FUNCTIONS IN QED | 1989 | LNF_89_025(PT).pdf | F. AVERSA, M. GRECO | |
| 807 | 1989-00-00 | THE FLUX OF THE VERTICAL NEGATIVE MUONS STOPPING AT DEPTHS 0.35-1000 hg/cm2 | 1989 | LNF_89_026(P).pdf | H. BILOKON, C.CINI CASTGNOLI, A. CASTELLINA, B. D'ETTORE PIAZZOLI, G. MANNOCCHI, E. MERONI, P. PICCHI, S. VERNETTO | |
| 757 | 1989-00-00 | CIRCUITO TRASLATORE ECL-NIM: 8 INPUTS ECL, 8x3 OUTPUTS NIM | 1989 | LNF_89_027(NT).pdf | M. ALBICOCCO, L. FALCO, A. ORLANDI, W. PESCI, A. VITICCHIE' | |
| 758 | 1989-00-00 | CIRCUITO ALLUNGATORE DI SEGNALI ECI | 1989 | LNF_89_028(NT).pdf | M. ALBICOCCO, N. BIANCHI, L. FALCO, A. VITICCHIE' | |
| 759 | 1989-00-00 | SPHERICAL-WAVE CORRECTIONS IN PHOTO-ELECTRON DIFFRACTION | 1989 | LNF_89_029.pdf | J. MUSTRE DE LEON, J.J. REHR, C.R. NATOLI, C.S. FADLEY, J. OSTERWALDER | |
| 760 | 1989-00-00 | EXPERIMENTAL STUDY OF ATMOSPHERIC NEUTRINO FLUX IN THE NUSEX EXEPERIMENT | 1989 | LNF_89_030.pdf | THE NUSEX COLL.:M. AGLIETTA, G. BATTISTONI, E. BELLOTTI, C. BLOISE, G. BOLOGNA, C. BROGGINI, P. CAMPANA, C. CASTAGNOLI, A. CASTELLINA,V. CHIARELLA, O. CREMONESI, D. CUNDY, B. D'ETTORE PIAZZOLI, E. FIORINI, W. FULGIONE, P. GALEOTTI, E. IAROCCI, C. LIGUORI, G. MANNOCCHI, G. MURTAS, P. NEGRI, G. NICOLETTI, P. PICCHI, M. PRICE, A. PULLIA, S. RAGAZZI, O. SAAVEDRA, L. SATTA, S. VERNETTO, L. ZANOTTI | |
| 751 | 1989-00-00 | CONFORMAL INVARIANCE OF s-MODELS AND CLASSICAL STRING PHYSICS | 1989 | LNF_89_031.pdf | S. BELLUCCI | |
| 808 | 1989-00-00 | AN OBSERVATION OF A LEADING MESON IN p+Ne REACTION AT 607 MeV/cINCIDENT MOMENTUM | 1989 | LNF_89_032.pdf | F. BALESTRA, S. BOSSOLASCO, M.P. BUSSA, L. FERRERO, D. PANZIERI, G. PARIGINO, F. TOSELLO, R. BARBIERI, G. BENDISCIOLI, A. ROTONDI, P. SALVINI, A. ZENONI, Yu A. BATUSOV, U.V. FALOMKIN, G.B. PONTECORVO, M.G. SAPOZHNIKOV, V.I. TRETYARK, C. GUARALDO, F.O. BREIVIK, T. JACOBSEN, S.O. SORENSEN | |
| 809 | 1989-00-00 | THE LARGE-VOLUME DETECTOR (LVD)- A MULTIPURPOSE UNDERGROUND DETECTOR AT GRAN SASSO | 1989 | LNF_89_033.pdf | G. BARI, M. BASILE, G. BRUNI, G. CARA ROMEO, A. CASTELVETRI, L. CIFARELLI, A. CONTIN, C. DEL PAPA, P. GIUSTI, G. IACOBUCCI, G. MACCARONE, T. MASSAM, R. NANIA, V. O'SHEA, F. PALMONARI, E. PEROTTO, G. SARTORELLI, M. WILLUTWKY, M. ARYAL, K. DE, A.M. SHAPIRO, M. WIDGOFF, J.A. CHINCELLATO, C. DOBRIGKEIT-CHINCELLATO, A.C. FAUTH, A. TURTELLI, F. ROHRBACH, A. ZICHICHI, L. CAPUTI, G. SUSINNO, G. BARBAGLI, G. CONFORTO, G. LANDI, P. PELFER, G. ANZIVINO, S. BIANCO, R. CASACCIA, F. CINDOLO, M. DEFELICE, Y. DONG, M. ENORINI, F.L. FABBRI, C. JING, I. LAAKSO, S. QIAN, Z. SHI, A. SPALLONE, Y. SUN, L. VOTANO, A. ZALLO, K. LAU, F. LIPPS, B. MAYES, G.H. MO, L. PINSKY, J. PYRLIK, D. SANDERS, W.R. SHELDON, R. WEINSTEIN, Y. DAI, L. DIN, G. JING, Z. LU, P. SHEN, Q. ZHU, D. ALYEA, T. KITAMURA, Y. MINORIKAWA, G. DI SCIASCIO, R. SCRIMAGLIO, P. ROTELLI, G.E. KOCHAROV, V. VASILEYEV, M. DEUTSCH, E.S. HAFEN, P. HARIDAS, B. JECKELMANN, G. JI, H.H. HUANG, C.S. MAO, A. PITAS, I.A. PLESS, S.W. WANG, Y.R. WU, Y.R. YUAN, C.Z. ZHAO, V.S. BEREZINZKY, V.L. DADYKIN, F.F. KHAICHUKOV, E.V. KOROLKOVA, P.V. KORTCHAGUIN, V.B. KORTCHACUIN, V.A. KUDRYAVTESV, A.S. MARKOV, V.G. RYASSNY, O.G. RYAZHASKAYA, V.P. TALOCHKIN, V.F. YAKUSHEV, G.T. ZATSEPIN, J. MOROMISATO, E. SALETAN, D. SHAMBROON, E. VON GOELER, N. TAKAHASHI, I. YAMAMOTO, T. WADA, G. D'ALI, S. DE PASQUALE, B. ALPAT, F. ARTEMI, M. ITALIANI, P. DIODATI, P. SALVADORI, A. MISAKI, N. INOUE, T. HARA, C. AGLIETTA, G. BADINO, L. BERGAMASCO, C. CASTAGNOLI, G. NAVARRA, L. PERIALE, P. PICCHI, O. SAAVEDRA, G.C. TRINCHERO, P. VALLANIA, S. VERNETTO, F. GRIANTI, F. VETRANO | |
| 761 | 1989-00-00 | PONTECORVO REACTIONS OF TWO-BODY ANTIPROTON ANNNIHILATION IN DEUTERIUM | 1989 | LNF_89_034.pdf | L.A. KONDRATYUK, M.G. SAPOZHNIKOV | |
| 762 | 1989-00-00 | WAKE FIELD MEASUREMENTS | 1989 | LNF_89_035(P).pdf | L. PALUMBO, V. G. VACCARO | |
| 810 | 1989-00-00 | UNDERGROUND SURVIVAL PROBABILITIES OF HIGH ENERGY MUONS IN THE DEPTH RANGE 3100-10100 hg/cm2 OF STANDARD ROCK | 1989 | LNF_89_036(P).pdf | H. BILIKON, A. CASTELLINA, B. D'ETTORE PIAZZOLI, G. MANNOCCHI, P. PICCHI, S. VERNETTO | |
| 811 | 1989-00-00 | SIMULATION OF LOW-ENERGY ANTIPROTON INTERACTIONS IN A SAMPLING CALORIMETER | 1989 | LNF_89_037.pdf | A. CODINO, C. FEDERICO, C. GRIMANI, M. MENICHELLI, E. RONGONI, I. SALVATORI, P. SPILLANTINI, G. BASINI, F. BONGIORNO, A. MORSELLI, M. OCCHIGROSSI, M. RICCI | |
| 752 | 1989-00-00 | MATTER AND ANTIMATTER IN THE SAME UNIVERSE? | 1989 | LNF_89_038.pdf | G. BASINI, A. MORSELLI, M. RICCI | |
| 812 | 1989-00-00 | STARNET, A FIBER OPTIC MAN WITH STAR TOPOLOGY | 1989 | LNF_89_039(P).pdf | G. MEDICI, G. MIRABELLI, E. VALENTE, R. CARDARELLI, R. SANTONICO, P. BACILIERI, A. GHISELLI, O. CIAFFONI, G. DI PIRRO, M.L. FERRER, A. MARTINI, E. PACE, M. PISTONI, L. TRASATTI, B. CACCIA, S. VALENTINI, M. COLI | |
| 763 | 1989-00-00 | AGGIORNAMENTO DEL MENU' NELLA VERSIONE 11.5 DEL S700I ITALCAD | 1989 | LNF_89_040(NT).pdf | A. BEATRICI | |
| 764 | 1989-00-00 | CORSO PER L'USO DEL MODELLATORE SOLIDO S7000 ITALCAD | 1989 | LNF_89_041(NT).pdf | A. BEATRICI | |
| 765 | 1989-00-00 | STRUCTURE FUNCTIONS AND INITIAL-FINAL STATE INTERFERENCE IN QED | 1989 | LNF_89_042(PT).pdf | M. GRECO | |
| 813 | 1989-00-00 | NON COMPACT FORMULATION OF ABEALIAN GAUGE THEORIES ON THE LATTICE AND CHARGE QUANTIZATION | 1989 | LNF_89_043(PT).pdf | F. PALUMBO, G. DE FRANCESCHI | |
| 766 | 1989-00-00 | SUPERCONDUCTING WIGGLER FOR ADONE FIRST TEST AND RESULTS | 1989 | LNF_89_044(R).pdf | M. BARONE, A. CATTONI, C. SANELLI | |
| 814 | 1989-00-00 | PROPOSAL OF MEASURING THE TOTAL PHOTONUCLEAR CROSS SECTION BETWEEN 300 MeV AND 1.2 GeV | 1989 | LNF_89_045(R).pdf | M. ANGHINOLFI, N. BIANCHI, P. CORVISIERO, E. DE SANCTIS, S. FRULLANI, F. GARIBALDI, G. GERVINO, C. GUARALDO, P. LEVI SANDRI, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, G. RICCO, M. RIPANI, P. ROSSI, M. SANZONE, M. TAIUTI, M. G. URCIOLI, A. ZUCCHIATTI | |
| 815 | 1989-00-00 | SPECIAL CASES OF THE REGULARISATION OF THE CONFORMAL INVERSION TRANSFORM BY CESARO SUMMABILITY | 1989 | LNF_89_046(PT).pdf | C. BASILE, E. ETIM, M. PALLOTTA | |
| 816 | 1989-00-00 | CESARO SUMMABILITY OF THE FOURIER INTEGRAL RAPRESENTATIONS OF THE BLOCH-NORDSIECK DISTRIBUTION AND ITS DERIVATIVES | 1989 | LNF_89_047(PT).pdf | C. BASILE, E. ETIM, M. PALLOTTA | |
| 817 | 1989-00-00 | PRELIMINARY MEASUREMENTS ON ELECTROLYTIC NUCLEAR COLD FUSION AT UNDERGROUND GRAN SASSO LABORATORY | 1989 | LNF_89_048(P).pdf | F. CELANI, M. DE FELICI, F.L. FABBRI, L. LIBERATORI, A. SAGGESE, A. SPALLONE, V. DI STEFANO, V. RUSSO, P. MARINI, S. PACE, S. BIANCO, L. DONATI, M. GIARDONI, L. PASSAMONTI, B. POLICHETTI | |
| 818 | 1989-00-00 | IMPROVED SUPERGEOMETRIES FOR TYPE-II GREEN-SCHWARZ NONLINEAR s-MODELS | 1989 | LNF_89_049(PT).pdf | S. BELLUCCI, S.J. GATES Jr., B. RADAK, S. VASHAKIDZE | |
| 767 | 1989-00-00 | CIRCUITO PER IL CONTROLLO DELLA TEMPERATURA DI UN MAGNETE CURVANTE DI ADONE | 1989 | LNF_89_050(NT).pdf | M. ALBICOCCO, L. FALCO | |
| 768 | 1989-00-00 | STUDIO DELLA DINAMICA DI UNA PARTICELLA RELATIVISTICA IN UNA CAVITA’ CON CAMPO ACCELERANTE CON DISTRIBUZIONE RETTANGOLARE O SINUSOIDALE | 1989 | LNF_89_051(R).pdf | S. BARTALUCCI, M. BASSETTI, L. PALUMBO | |
| 819 | 1989-00-00 | EXACT THERMAL AND STRUCTURAL DAMPING OF THE MULTIPLE SCATTERING CONTRIBUTION TO THE XANES | 1989 | LNF_89_052.pdf | M. BENFATTO, C.R. NATOLI, A. FILIPPONI. | |
| 820 | 1989-00-00 | L1 ABSORPTION EDGE OF HIGH CORRELATED RARE EARTH MATERIALS | 1989 | LNF_89_053.pdf | A. MARCELLI, A. BIANCONI | |
| 821 | 1989-00-00 | THE LVD EXPERIMENT | 1989 | LNF_89_054.pdf | C. BARI, M. BASILE, G. BRUNI, G. CARA ROMEO, A. CASTELVETRI, L. CIFARELLI, A. CONTIN, C. DEL PAPA, P. GIUSTI, G. IACOBUCCI, G. MACCARRONE, T. MASSAM, R. NANIA, V. O'SHEA, F. PALMONARI, E. PEROTTO, G. SARTORELLI, M. WILLUZKY, M. ARYAL, K. DE, A.M. SHAPIRO, M. WIDGOFF, J.A. CHINCELLATO, C. DOBRIGKEIT CHINCELLATO, A.C. FAUTH, A. TURTELLI, F. ROHRBACH, A. ZICHICHI, L. CAPUTI, G. SUSINNO, G. BARBAGLI, G. CONFORTO, G. LANDI, P. PELFER, G. ANZIVINO, S. BIANCO, R. CASACCIA, F. CIONDOLO, M. DEFELICE, Y. DONG, M. ENORINI, F.L. FABBRI, C. JING, I. LAAKSO, S. QIAN, A. RINDI, Z. SHI, A. SPALLONE, Y. SUN, L. VOTANO, A. ZALLO, K. LAU, F. LIPPS, B. MAYES, G.H. MO, L. PINSKY, J. PYRLIK, D. SANDERS, W.R. SHELDON, R. WEINSTEIN, Y. DAI, L. DIN, G. JING, Z. LU, P. SHEN, Q. ZHU, D. ALYEA, T. KITAMURA, Y. MINORIKAWA, G. DI SCIASCIO, R. SCRIMAGLIO, P. ROTELLI, G.E. KOCHAROV, V. VASILEYEV, M. DEUTSCH, E.S. HAFEN, P. HARIDAS, B. JECKELMANN, G. JI, H.H. HUANG, C.S. MAO, A. PITAS, I.A. PLESS, S.W. WANG, Y.R. WU, Y.R. YUAN, C.Z. ZHAO, V.S. BEREZINSKY, V.L. DADYKIN, F.F. KHAICHUKOV, E.V. KOROLKOVA, P.V. KORTCHAGUIN, V.B. KORCHAGUIN, V.A. KUDRYAVTESV, A.S. MARKOV, V.G. RYASSNY, O.G. RYAZHASKAYA, V.P. TALOCHKIN, V.F. YAKUSHEV, G.T. ZATSEPIN, J. MOROMISATO, E. SAETAN, D. SHAMBROOM, E. VON GOELER, N. TAKAHASHI, I. YAMAMOTO, T. WADA, G. D'ALI, S. DE PASQUALE, B. ALPAT, F. ARTEMI, C. CAPPELLETTI, P. DIODATI, P. SALVADORI, A. MISAKI, N. INOUE, T. HARA, C. AGLIETTA, G. BADINO, L. BERGAMASCO, C. CASTAGNOLI, A. CASTELLINA, G. CINI, M. DARDO, W. FULGIONE, P. GALEOTTI, P. GHIA, C. MORELLO, G. NAVARRA, L. PERIALE, P. PICCHI, O. SAAVEDRA, G.C. TRINCHERO, P. VALLANIA, S. VERNETTO, F. GRIANTI, F. VETRANO | |
| 822 | 1989-00-00 | OPTICAL FIBERS AND THEIR APPLICATIONS | 1989 | LNF_89_055.pdf | L. TRASATTI | |
| 823 | 1989-00-00 | LOW ENERGY ANTIPROTON-NUCLEUS ANNIHILATION | 1989 | LNF_89_056.pdf | C. GUARALDO | |
| 824 | 1989-00-00 | A COSMIC ANTIMATTER DETECTOR ON A POLAR-ORBIT SATELLITE | 1989 | LNF_89_057.pdf | G. BASINI, M. RICCI, P. SPILLANTINI, P. PICOZZA | |
| 826 | 1989-00-00 | WIZARD2: A PROPOSAL TO COMPLEMENT WIZARD DETECTOR WITH TWO FURTHER MODULES OF TRACKING CALORIMETER AND AN ACCURATE SPARK COUNTER t.o.f. SYSTEM | 1989 | LNF_89_059.pdf | P. SPILLANTINI, M. BOCCIOLINI, F. CELLETTI, M. MESCHINI, Y.F. WANG, G. BASINI, E. BONAVIRI, F. BONGIORNO, A. MORSELLI, M. OCCHIGROSSI, M. RICCI, R. BERNABEI, V. BIDOLI, M.P. DE PASCALE, P. PICOZZA, A. CODINO, M. MENICHELLI, C. DE MARZO, G. BERBIELLINI, P. GALEOTTI | |
| 827 | 1989-00-00 | PROJECT GRAAL: THE SCIENTIFIC CASE | 1989 | LNF_89_060(P).pdf | D. BABUSCI, L. CASANO, A. D'ANGELO, P. PICOZZA, C. SCHAERF, B. GIROLAMI | |
| 769 | 1989-00-00 | (1,0) THIRRING MODELS AND THE COUPLING OF SPIN-0 FIELDS TO THE HETEROTIC STRING | 1989 | LNF_89_061(PT).pdf | S. BELLUCCI, D. A. DEPIREUX, S. J. GATES Jr. | |
| 770 | 1989-00-00 | MILLING MACHINE FOR LST READOUT PADS | 1989 | LNF_89_062(NT).pdf | P. BENVENUTO, R. CASACCIA, M. GATTA, E. GRADL, I. LAAKSO, F. MASI, A. PECCHI | |
| 828 | 1989-00-00 | BREMSSTRAHLUNG AND THE UNDERLYING EVENT STRUCTURE | 1989 | LNF_89_063(PT).pdf | A. GRAU, G. PANCHERI, Y.N. SRIVASTAVA | |
| 771 | 1989-00-00 | SUPERCONDUCTING PROPERTIES OF NIOBIUM THIN FILMS FOR APPLICATIONS IN ACCELERATING CAVITIES | 1989 | LNF_89_064(R).pdf | D. DI GIOACCHINO, U. GAMBARDELLA, P. GILSON, G. PATERNO', C. VACCAREZZA | |
| 829 | 1989-00-00 | BLOCH NORDSIEK REGULARIZATION OF QCD TRANSVERSE MOMENTUM DISTRIBUTIONS | 1989 | LNF_89_065(PT).pdf | A. GRAU, G. PANCHERI, Y.N. SRIVASTAVA | |
| 830 | 1989-00-00 | A SIMPLE DESCRIPTION OF NUCLEON HIGH-MOMENTUM COMPONENTS DUE TO SHORT-RANGE CORRELATIONS IN NUCLEI | 1989 | LNF_89_066.pdf | A. MALECKI, P. PICOZZA, P.E. HODGSON | |
| 772 | 1989-00-00 | THE ADONE WIGGLER X-RAY LITHOGRAPHY BEAMLINE | 1989 | LNF_89_067.pdf | E. BURATTINI, A. GRILLI, A. BALERNA, E. BERNIERI, S. SIMEONI, C. MENCUCCINI, CHEN QIAN-HONG | |
| 773 | 1989-00-00 | SINGLE AND MULTIPLE MOUN EVENTS IN LVD DETECTOR | 1989 | LNF_89_068(P).pdf | G. ANZIVINO, S. BIANCO, R. CASACCIA, F. CINDOLO, M. DE FELICE, M. ENORINI, F.L. FABBRI, I. LAAKSO, E. PALLANTE, G. SUSINNO, L. VOTANO, A. ZALLO, G. BARI, M. BASILE, G. BRUNI, G. CARA ROMEO, L. CIFARELLI, A. CONTIN, C. DEL PAPA, P. GIUSTI, G. IACOBUCCI, G. MACCARONE, T. MASSAM, R. NANIA, G. SARTORELLI, G. D'ALI', A. ZICHICHI | |
| 831 | 1989-00-00 | COHERENT STATES AND STRUCTURE FUNCTIONS IN QED | 1989 | LNF_89_069(PT).pdf | M. GRECO | |
| 774 | 1989-00-00 | STARNET, A FIBER OPTICAL METROPOLITAN AREA NETWORK WITH CENTRALIZED CONTROL | 1989 | LNF_89_070.pdf | P. BACILIERI, B. CACCIA, R. CARDARELLI, G.P. CARLUCCI, O. CIAFFONI, M. COLI, G. DI PIRRO, M.L. FERRER, A. GHISELLI, A. MARTINI, G. MEDICI, G. MIRABELLI, E. PACE, R. SANTONICO, L. TRASATTI, E. VALENTE, S. VALENTINI | |
| 775 | 1989-00-00 | CORSO BASE DI CAD BIDIMENSIONALE S7000 ITALCAD | 1989 | LNF_89_071(NT).pdf | A. BEATRICI | |
| 776 | 1989-00-00 | CORSO AVANZATO DI CAD BIDIMENSIONAL S7000 ITALCAD | 1989 | LNF_89_072(NT).pdf | A. BEATRICI | |
| 832 | 1989-00-00 | SURFACE XANES | 1989 | LNF_89_073(P).pdf | A. BIANCONI, A. MARCELLI | |
| 833 | 1989-00-00 | HIGH RESOLUTION POLARIZED X RAY ABSORPTION SPECTROSCOPY: SYMMETRY OF THE HOLES STATES IN THEHIGH Tc SUPERCONDUCTORS | 1989 | LNF_89_074(P).pdf | A. MARCELLI | |
| 834 | 1989-00-00 | MONOCROMATORE PER RAGGI X MOLLI CON CRISTALLI InSb | 1989 | LNF_89_075(NT).pdf | L. MORETTO, F. BOSCHERINI, S. MOBILIO | |
| 777 | 1989-00-00 | INTERACTION OF GRAVITY AND MATTER IN THE EXTEND N=4 SUPERSYMMETRY | 1989 | LNF_89_076(P).pdf | M.V. TERENTIEV | |
| 778 | 1989-00-00 | PRIMARY COSMIC RAY SPECTRUM IN THE 10^13-10^17 eV ENERGY RANGE FROM THE ANALYSIS OF MULTIPLE MUON EVENTS IN THE NUSEX EXPERIMENT | 1989 | LNF_89_077(P).pdf | M. AGLIETTA, G. BADINO, G. BOLOGNA, C. CASTAGNOLI, A. CASTELLINA, B. D'ETTORE PIAZZOLI, W. FULGIONE, P. GALEOTTI, G. MANNOCCHI, P. PICCHI, O. SAAVEDRA, G. TRINCHERO, S. VERNETTO | |
| 842 | 1989-00-00 | BULK SUPERCONDUCTIVITY ON OZONE ANNEALED YBCO SAMPLE BY A.C. SCREENING CURRENT MEASUREMENTS | 1989 | LNF_89_078(P).pdf | F. CELANI, A. SAGGESE, S. PACE, L. LIBERATORI, N. SPARVIERI | |
| 779 | 1989-00-00 | OBSERVATION OF EXCESS MUON EVENTS FROM THE DIRECTION OF CYGNUS X-3 IN THE NUSEX EXPERIMENT | 1989 | LNF_89_079(P).pdf | M. AGLIETTA, G. BADINO, G. BOLOGNA, C. CASTAGNOLI, A. CASTELLINA, B. D'ETTORE PIAZZOLI, W. FUGIONE, P. GALEOTTI, G. MANNOCCHI, P. PICCHI, O. SAAVEDRA, G. TRINCHERO, S. VERNETTO | |
| 780 | 1989-00-00 | FEL USING THE SC LINEAR ACCELERATOR "LISA" AT LNF | 1989 | LNF_89_080(P).pdf | M. CASTELLANO, A. GHIGO, P. PATTERI, C. SANELLI, M. SERIO, F. TAZZIOLI, N. CAVALLO, F. CEVENINI, F. CIOCCI, G. DATTOLI, A. DIPACE, G.P. GALLERANO, A. RENIERI, E. SABIA, A. TORRE | |
| 781 | 1989-00-00 | STUDY OF LISA FEL OPERATION WITH PREBUNCHED BEAM | 1989 | LNF_89_081(P).pdf | P. PATTERI, M. CASTELLANO, A. GHIGO | |
| 835 | 1989-00-00 | THE HIGH SPEED BUS SYSTEM FOR LISA | 1989 | LNF_89_082(P).pdf | L. CATANI, G. DI PIRRO, C. MILARDI, L. TRASATTI, F. GIACCO, F. SERLINI | |
| 782 | 1989-00-00 | ANNUAL REPORT | 1989 | LNF_89_083.pdf | A A. V V. | |
| 836 | 1989-00-00 | CONSISTENT AND UNIVERSAL INCLUSION OF THE LORENTZ CHERN-SIMONS FORM IN D=10, N=1 SUPERGRAVITY THEORIES | 1989 | LNF_89_085(PT).pdf | S. BELLUCCI, D.A. DEPIREUX, S.J. GATES Jr. | |
| 784 | 1989-00-00 | LISA CAPTURE SECTION: SIMULATION OF PARTICLE DYNAMICS | 1989 | LNF_89_086(R).pdf | C. BISCARI | |
| 837 | 1989-00-00 | DEUTERON PHOTODISINTEGRATION AND QUARK MODELS | 1989 | LNF_89_087(P).pdf | E. DE SANCTIS, A.B. KAIDOLOV, L.A. KONDRATYUK | |
| 785 | 1989-00-00 | OPTIMAZATION OF A SYNCHROTRON BASED X-RAY LITHOGRAPHIC SYSTEM | 1989 | LNF_89_088.pdf | E. BERNIERI, A. BALERNA | |
| 839 | 1989-00-00 | A CRUCIAL TEST FOR QCD: THE TIME-LIKE E.M. FORM-FACTOR OF THE NEUTRON | 1989 | LNF_89_090(P).pdf | R. BALDINI-FERROLI, M.G. BIAGINI | |
| 786 | 1989-00-00 | DYNAMICS OF A CHARGED PARTICLE IN AN ACCELERATING FIELD | 1989 | LNF_89_091.pdf | S. BARTALUCCI, M. BASSETTI, L. PALUMBO | |
| 787 | 1989-00-00 | IMPROVEMENTS OF SINTERED YBCO SAMPLES BY CITRATE PYROLYSIS AND OZONE ANNEALING | 1989 | LNF_89_092(P).pdf | F. CELANI, A. SAGGESE, V. CALZONA, M. PUTTI, L. LIBERATORI, S. PACE, B. POLICHETTI, R. SCAFURO | |
| 840 | 1989-00-00 | FEL PROJECT IN FRASCATI INFN LABORATORIES WITH THE LINEAR SUPERCONDUCTING ACCELERATOR LISA | 1989 | LNF_89_093.pdf | M. CASTELLANO, A. GHIGO, P. PATTERI, F. TAZZIOLI, N. CAVALLO, F. CEVENINI, F. CIOCCI, G. DATTOLI, A. DIPACE, G.P. GALLERANO, A. RENIERI, E. SABIA, A. TORRE | |
| 841 | 1989-00-00 | THERMAL AND STRUCTURAL DAMPING OF THE MULTIPLE-SCATTERINGCONTRIBUTIONS TO THE X-RAY-ABSORPTION COEFFICIENT | 1989 | LNF_89_094.pdf | M. BENFATTO, C.R. NATOLI, A. FILIPPONI | |
| 3659 | 1988-12-22 | Sequential mechanism for the 7Li (3He, a)6Li(d)a reaction at incident energy between 2.5 and 11.5 MeV | 1988 | INFN-BE_88-5.pdf | F. Bonsignore P. D'Agostino G. Fazio G. Giardina S. Interdonato A. Italiano R. Palamara A. Taccone | |
| 3654 | 1988-12-06 | Fifth force, sixth force, and all that: A theoretical (classical) comment | 1988 | INFN-AE_88-13.pdf | E. Recami V. Tonin-Zanchin | |
| 5657 | 1988-12-05 | STRUCTURE CONSTANTS OF THE (A,D) MINIMAL C LESS THAN 1 CONFORMAL MODELS | 1988 | INFN-AE-88-12.pdf | V.B. Petkova. | The primary fields structure constants of the (A,D) minimal c < l series are computed explicitly. Various inperpretations of the fusion algebras are discussed. |
| 3653 | 1988-12-05 | Structure constants of the (A,D) minimal C less than 1 conformal models | 1988 | INFN-AE_88-12.pdf | V.B. Petrova | |
| 3688 | 1988-11-25 | A time of flight system based on low-pressure multiwire proportional counters for accelerator mass spectroscopy | 1988 | INFN-TC_88-29.pdf | R. Bonetti E. Fioretto S. Schiatti | |
| 3687 | 1988-10-08 | Splitter board for strip readout of the warm iron calorimeter at 'SLD' | 1988 | INFN-TC_88-28.pdf | N. Bacchetta D. Bisello S. Galvagni M. Scarlatella | |
| 5656 | 1988-10-03 | IDENTIFICATION OF SEMILEPTONIC DECAY OF T-QUARK PRODUCED AT LEP-II | 1988 | INFN-AE-88-11.pdf | B. Gobbo, L. Rolandi. | In this report we discuss some selection criteria to identify the production of t<span style='text-decoration: overline'>t</span> pairs in the e<sup>+</sup>e<sup>-</sup> interaction in the case that the production threshold for this process is below that of W<sup>+</sup>W<sup>-</sup> pairs. Since the mass of the top quark is expected to be in the range [1]: 44 GeV < m<sub>t</sub> < 200 GeV there is a chance that it is lighter than the W. In this case it can be produced with the LEP machine when its centre of mass energy will be increased up to the W<sup>+</sup>W<sup>-</sup> threshold. The identification of heavy quark production in e<sup>+</sup>e<sup>-</sup> interaction has already been studied in the past [2]. We present a new criteria based on the identification of the semileptonic decay of the top quark. These events, that have a very peculiar topology, can be also used to measure the mass of the quark. A more detailed discussion of some of the arguments presented in this report can be found in ref. [3]. |
| 3651 | 1988-09-26 | Probing the standard model at the SPS Collider. Experimental results from UA1 | 1988 | INFN-AE_88-10.pdf | A. Bettini | |
| 5655 | 1988-09-21 | ULTRA-HIGH SENSITIVITY MASS SPECTROMETRY: APPLICATIONS TO RARE NUCLEAR AND COSMOLOGICAL PROCESSES ARCHIVED IN GEOLOGICAL SAMPLES. | 1988 | INFN-AE-88-9.pdf | C. Tuniz, J. Klein. | Interactions among panicle physicists, cosmologists and astrophysicists are creating a new discipline, <i>astroparticle physics</i><sup>1</sup>, of great scientific importance. This new discipline is encouraging a variety of experiments, not involving high-energy accelerators, whose main aim is to test the predictions of Grand Unified Theories and neutrino physics. A theoretical overview of the present situation in panicle physics, with a particular emphasis on these new aspects, is given in Ref. 2. A recent review on experimental panicle physics without accelerators is given in Ref. 3. Two principal detection methods are employed in these experiments: Direct detection using characteristic radiation or kinematic reconstruction for identification, and passive accumulation of reaction products followed by chemical separation and identification by highly sensitive analytic techniques. Significant progress in the direct measurement of neutrinos and rare decays is forseen with the development of cryogenic detectors like superheated superconducting granules, bolometers, and tunneling junctions. Ultra-sensitive analytic techniques, developed in the last few years, such as laser-based Resonance Ionization Spectrometry (RIS) and Accelerator-based Mass Spectrometry (AMS) allow new and as yet unforseen opportunities for the detection of rare processes using <i>radiochemical</i> and <i>geochemical</i> methods. We will give an overview of the use of ultra-sensitive mass spectrometry in detecting the products of very rare processes like proton decay and double-beta decay, and the detection of panicles of special interest such as relics from the Big Bang (panicles whose inclusion results in isotopes with anomalously high masses or with fractional charges) and superheavy elements. In particular, we will describe and examine the potential of several new possibilities afforded by AMS to search for the products of double-beta decay accumulated in natural samples over geological times. |
| 5654 | 1988-09-20 | TOWARD SOLVABLE 4-DIMENSIONAL CONFORMAL THEORIES. | 1988 | INFN-AE-88-8.pdf | P. Furlan, V.B. Petkova. | The Symanzik representation, based on the Mellin transform, is explored to analyze the asymptotic behaviour of conformal invariant n-point functions, constructed through a generalization to arbitrary (even) space-time dimension of the two-dimensional Coulomb gas representation. |
| 3685 | 1988-09-09 | Amsend: A database driven interface to electronic mail systems | 1988 | INFN-TC_88-26.pdf | R. Fantechi R. Brazioli V. Emiliani S.M. Fisher P. Palazzi Z.X. Qian .R. Zhao | |
| 3686 | 1988-09-09 | Pixe analysis of tree leaves as a possible comparative integral monitor of particulates in urban areas | 1988 | INFN-TC_88-27.pdf | A. Zucchiatti H.J. Annegarn R. Chisci | |
| 3648 | 1988-09-09 | Uso di fibre ottiche scintillanti nella rivelazione di immagini X da luce di Sincrotrone | 1988 | INFN-AE_88-7.pdf | G. Zanella, R. Zannoni | |
| 863 | 1988-09-05 | RAPPORTO ATTIVITA' 1987 | 1988 | LNF_88_052(R).pdf | Curato dal Servizio Documentazione | |
| 3684 | 1988-07-29 | Analytical treatment of the spin-splitter | 1988 | INFN-TC_88-25.pdf | M. Conte A. Penzo A. Pisenet M. Pusterla | |
| 5653 | 1988-07-29 | SET-UP AND TRIGGER FOR THE MEASUREMENT OF THE INCLUSIVE PRODUCTION OF STRANGE PARTICLES IN THE E-704 TEVATRON EXPERIMENT. | 1988 | INFN-AE-88-6.pdf | F. Nessi-Tedaldi, M. Nessi, R. Stanek, A. Penzo, A.M. Zanetti. | We have studied the criteria for selecting strange particles in the interactions of polarized protons produced at the Tevatron, for measuring spin effects at high energies. |
| 3683 | 1988-07-11 | Studio di fattibilità di una infrastruttura di comunicazione ad alta velocità per la rete della ricerca | 1988 | INFN-TC_88-24.pdf | A. Ghiselli A. Adrualdi G. Neri E. Valente | |
| 3682 | 1988-07-08 | Effetto della temperatura sulla risposta di un cristalloo BGO | 1988 | INFN-TC_88-23.pdf | M. Anghinolfi M. Castoldi A. Rottura | |
| 3658 | 1988-07-05 | Fragmentation of the giant dipole resonance in an algebraic model | 1988 | INFN-BE_88-4.pdf | G. Maino A. Ventura L. Zuffi | |
| 3681 | 1988-06-28 | Self field effects in the critical current measurements of S.C. cables | 1988 | INFN-TC_88-22.pdf | P. Fabbricatore P. Fernandes R. Parodi R. Vaccarone | |
| 3680 | 1988-06-22 | Ruthenim oxide resistors as a sensitive elements of composite bolometers: Preliminary results | 1988 | INFN-TC_88-21.pdf | M. Benassi G. Gallinaro F. Gatti S. Siri S. Vitale | |
| 3679 | 1988-06-21 | Odoscopio a 16 elementi per rivelazione di frammenti di proiettile a piccoli angoli inrelazioni indotte da ioni pesanti alle energie del C.S. | 1988 | INFN-TC_88-20.pdf | F. Librizzi D. Nicotra C. Rapicavoli | |
| 3678 | 1988-06-13 | Preliminary design of the beam transport system for the Milan biomedical cyclotron | 1988 | INFN-TC_88-19.pdf | M. Silari, | |
| 3677 | 1988-04-28 | Mechanical thermal and electrical measurements on materials and components of the milan superconducting cyclotron | 1988 | INFN-TC_88-16.pdf | E. Acerbi L. Rossi | |
| 3676 | 1988-04-20 | Transparent DE gas detector for heavy ions | 1988 | INFN-TC_88-15.pdf | F. Bonomo J. Romanski C. Tuvé R. Barnà D.De Pasquale | |
| 3675 | 1988-04-14 | Proposta per la realizzazione di mail di tipo X400 sulla rete dell'INFN, INFNET | 1988 | INFN-TC_88-17.pdf | G. Ghidetti A. Ghiselli | |
| 3673 | 1988-04-11 | Cavità superconduttrice a tre celle | 1988 | INFN-TC_88-13.pdf | M. Ferrario L. Ferrucci E. Habel | |
| 3674 | 1988-04-11 | Introduzione all'uso di Tex: linguaggio, tools, installazione | 1988 | INFN-TC_88-14.pdf | M.L. Luvisetto E. Ugolini | |
| 3672 | 1988-04-06 | 'Impianto di riduzione e idrogenazione' | 1988 | INFN-TC_88-18.pdf | A. Cecchi R. Pengo F. Scarpa P. Spolaore | |
| 3657 | 1988-04-06 | Simulation of inelastic hadron collisions below 5 GeV: a modification of geant3 pakage | 1988 | INFN-BE_88-3.pdf | P. Pedroni | |
| 3645 | 1988-03-28 | Beam particle momentum tagging for E687 experiment at fermilab | 1988 | INFN-AE_88-4.pdf | S. Malvezzi | |
| 3671 | 1988-03-21 | A software package for testing and debugging the fast digital data processor board | 1988 | INFN-TC_88-12.pdf | D. Corsetto, Shao Beibei | |
| 3644 | 1988-03-18 | A Cherenkov Ring imaging for particle identification in BB factory detector | 1988 | INFN-AE_88-3.pdf | N. Bacchetta, D Bisello, J. Wiss | |
| 3656 | 1988-03-08 | Emission of complex particles in precompound reactions | 1988 | INFN-BE_88-2.pdf | E. Gadioli | |
| 3643 | 1988-03-07 | A Phisico-Matematical Approach to ..... | 1988 | INFN-AE_88-2.pdf | W.A. Rodrigues Jr., M.A. Faria-Rosa, A. Maia Jr., E. Recami | |
| 3642 | 1988-03-01 | Simulations for the delphi HPC second level trigger (generalized) monopoles without string | 1988 | INFN-AE_88-1.pdf | D. Bollini, T. Camporesi, F.R. Cavallo, C. Chiccoli, P. Giusti, F.L. Navarria, P. Pasini | |
| 3669 | 1988-03-01 | Operation in a vacuum of a plastic scintillator range spectrometer | 1988 | INFN-TC_88-10.pdf | F. Librizzi, D. Nicotra | |
| 3670 | 1988-03-01 | Apparecchiature progettate e costruite nella Sezione INFN di Bari per la realizzazione dei rivelatori del calorimetro adronico per l'esperimento 'Aleph' | 1988 | INFN-TC_88-11.pdf | F. Ceglie, F. Chiumarulo, A. Clemente, R. Ferorelli, M. Franco, A. Masciullo, V. Negro, M. Papagni, C. Pinto | |
| 5652 | 1988-03-01 | Simulations for the delphi HPC second level trigger. | 1988 | INFN-AE-88-1.pdf | D. Bollini, T. Camporesi, F.R. Cavallo, C. Chiccoli, P. Giusti, F.L. Navarria, P. Pasini. | The HPC second level trigger must perform the following tasks: - measure the deposited energy according to a given (<a href="https://www.codecogs.com/eqnedit.php?latex=\theta" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\theta" title="\theta" /></a>, φ granularity; - compare the measured values with a low and a high energy threshold and count the 'low' and 'high' hits multiplicity; - encode the multiplicity information in four bits; two for the low hits (EMBLLO) and two for the high hits (EMBLHI) so that multiplicities 0,1,2 and > 2 are defined; - calculate the total energy released in the HPC detector which is to be compared with a low and a high energy threshold to set, accordingly, two bits: EMBLTELO, EMBLTEHI; - save the information of which (<a href="https://www.codecogs.com/eqnedit.php?latex=\theta" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\theta" title="\theta" /></a>,φ) cells have been hit to be used by the 3rd level trigger processor. - The HPC detector is constituted by 144 modules: 24 modules in φ and 6 modules along <a href="https://www.codecogs.com/eqnedit.php?latex=\theta" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\theta" title="\theta" /></a>. Within a total drift time of max 16 μsec each module is read out by 128 cathode pads which provide, together with the drift time information, the good space localizations of the energy depositions required at the final off-line analysis level. For the second level trigger, which must give an answer within 35 μsec from the beam cross over (BCO) time, however, such a number of channels is too large and an appropriate reduction may be obtained, a priori, either by performing analog sums of the pad signals or by reading out the 39 anode wires of the HPC module. The cathode pad layout and the anode wires are shown in Fig. 1. For what concerns the (<a href="https://www.codecogs.com/eqnedit.php?latex=\theta" target="_blank"><img src="https://latex.codecogs.com/gif.latex?\theta" title="\theta" /></a>,φ) granularity of the HPC second level trigger, in order to reduce the complexity of the system, it was originally proposed<sup>(1)</sup> to measure the energy in each separate HPC module without making use of the information on the longitudinal development of the showers and on the drift time. |
| 3667 | 1988-02-17 | Slippage and superradiance in the High-Gain FEL | 1988 | INFN-TC_88-8.pdf | R. Bonifacio, B.W.J.McNeil, P. Pierini | |
| 3668 | 1988-02-17 | Slippage and superradiance in the High-Gain FEL: Linear Theory | 1988 | INFN-TC_88-9.pdf | R. Bonifacio, C. Maroli, N. Piovella | |
| 3665 | 1988-02-05 | Generatore di impulsi per il controllo delle prestazioni di Rivelatori NAI | 1988 | INFN-TC_88-6.pdf | M. Castoldi, A. Rottura | |
| 3666 | 1988-02-05 | Self field effects in the critical current measuraments of Hera cables | 1988 | INFN-TC_88-7.pdf | P. Fabbricatore, R. Parodi, R. Vaccarone | |
| 3664 | 1988-02-01 | Angular dependence on the sputtering yield measured by low energy pixe analysis | 1988 | INFN-TC_88-5.pdf | L. Torrisi | |
| 3655 | 1988-01-21 | An algebraic approach to giant resonances | 1988 | INFN-BE_88-1.pdf | L. Zuffi | |
| 3662 | 1988-01-20 | Thin films preparation by the electrospray method in heavy ion induced desorption experiments | 1988 | INFN-TC_88-3.pdf | F. Riggi, R. Spina | |
| 3661 | 1988-01-19 | Linear inverse and Ill-Posed problems | 1988 | INFN-TC_88-2.pdf | M. Bertero | |
| 3660 | 1988-01-08 | A high power CW electron beam for FEL devices | 1988 | INFN-TC_88-1.pdf | I. Boscolo, F. Ciocci, G. Dattoli | |
| 870 | 1988-00-00 | UNDERGROUND NEUTRON FLUX MEASUREMENT | 1988 | LNF_88_001(P).pdf | A. RINDI, F. CELANI, M. LINDOZZI, S. MIOZZI | |
| 871 | 1988-00-00 | SYMMETRIES OF RANDOM SYSTEM FROM THE FOKKER-PLANCK EQUATIONS | 1988 | LNF_88_002(PT).pdf | E. ETIM | |
| 845 | 1988-00-00 | JET-JET P^ DISTRIBUTIONS IN THE PROCESS qq -- qqg | 1988 | LNF_88_003(RT).pdf | F. AVERSA | |
| 872 | 1988-00-00 | AN INFRARED ELECTRON LASER ON THE SUPERCONDUCTING LINAC LISA | 1988 | LNF_88_004(R).pdf | M. CASTELLANO | |
| 873 | 1988-00-00 | METODO DI PREPARAZIONE DI SUPERCONDUTTORI CERAMICI AD ALTA TEMPERATURA CRITICA CARATTERIZZATI DA BUONE PROPRIETA' DIAMAGNETICHE Sostituito da estratti | 1988 | LNF_88_005.pdf | F. CELANI, R. MESSI, N. SPARVIERI, S. PACE | |
| 874 | 1988-00-00 | DESIGN AND OPERATION OF A MULTIPACTING-FREE 51.4 MHz RF ACCELERATING CAVITY | 1988 | LNF_88_006(P).pdf | R. BONI, V. CHIMENTI, P. FERNANDES, R. PARODI, B. SPATARO, S. TAZZIOLI | |
| 875 | 1988-00-00 | THE MULTICHANNEL GENERALIZATION OF MULTIPLE SCATTERING THEORY: APPLICATION TO THE ANALYSIS OF INNER SHELL X-RAY SPECTRA OF MIXED-VALENT COMPOUNDS | 1988 | LNF_88_007(PT).pdf | C.R. NATOLI, M. BENFATTO | |
| 846 | 1988-00-00 | AN INJECTOR FOR LISA | 1988 | LNF_88_008(R).pdf | C. BISCARI, R. BONI, S. KULINSKI, B. SPATARO, S. TAZZIOLI, M. VESCOVI | |
| 847 | 1988-00-00 | LE RADIAZIONI IONIZZANTI - Opuscolo d'informazione | 1988 | LNF_88_009(NT).pdf | FISICA SANITARIA | |
| 876 | 1988-00-00 | THE MACRO DETECTOR AT THE GRAN SASSO LABORATORY | 1988 | LNF_88_010.pdf | The MACRO Collaboration: M. CALICCHIO, G. CASE, C. DEMARZO, O. ERRIQUEZ, C. FAVUZZI, N. GIGLIETTO, E. NAPPI, F. POSA, P. SPINELLI, F. BALDETTI, S. CECCHINI, G. GIACOMELLI, G. GRIANTI, G. MANDRIOLI, A. MARGIOTTA, L. PATRIZII, G. SANZANI, P. SERRA, M. SPURIO, S. AHLEN, A. CIOCIO, M. FELCINI, D. FICENEC, J. INCANDELA, A. MARIN, J. STONE, L. SULAK, W. WORSTELL, B. BARISH, C. LANE, G. LIU, C. PECK, G. PUOLARD, H. SLETTEN, S. COHEN, N. IDE, A. MANKA, R. STEINBERG, G. BATTISTONI, H. BILOKON, C. BLOISE, P. CAMPANA, V. CHIARELLA, A. GRILLO, E. IAROCCI, A. MARINI, J. REYNOLDSON, A. RINDI, F. RONGA, L. SATTA, M. SPINETTI, V. VALENTE, R. HEINZ, S. MUFSON, J. PETRAKIS, P. MONACELLI, A. REALE, M. LONGO, J. MUSSER, C. SMITH, G. TARLE', M. D'AMBROSIO, B.C. BARBARINO, G. GRANCAGNOLO, A. ONNEMBO, V. PALLADINO, C. ANGELINI, A. BALDINI, C. BEMPORAD, V. FLAMINIO, G. GIANNINI, R. PAZZI, G. AURIEMMA, M. DE VINCENZI, E. LAMANNA, G. MARTELLOTTI, O. PALAMARA, S. PETRERA, L. PETRILLO, P. PISTILLI, G. ROSA, A. SCIUBBA, M. SEVERI, P. GREEN, R. WEBB, V. BISI, P. GIUBELLINO, A. MARZARI CHIESA, L. RAMELLO | |
| 877 | 1988-00-00 | NON-SCALING PHENOMENA IN LOW-pt PHYSICS | 1988 | LNF_88_011(PT).pdf | G. PANCHERI, Y. N. SRIVASTAVA | |
| 848 | 1988-00-00 | STUDIO SULLE CONCENTRAZIONI DEI NUCLIDI RADIOATTIVI ARTIFICIALI NELLE MATRICI AMBIENTALI E ALIMENTARI LEGATE ALLA PRODUZIONE DEL VINO | 1988 | LNF_88_012(R).pdf | A. ESPOSITO, M. PELLICCIONI | |
| 849 | 1988-00-00 | SPECCHI ELLITTICI DA LASTRE PIANE DI "FLOAT GLASS" | 1988 | LNF_88_013(R).pdf | A. MARCELLI, A. SAVOIA, F. SGAMMA | |
| 878 | 1988-00-00 | ANALYSIS OF TUNNEL BARRIERS IN Nb/Pb JUNCTIONS | 1988 | LNF_88_014(P).pdf | F. CELANI, A. SAGGESE, M. LOSASSO, S. PACE, R. SCAFURO | |
| 879 | 1988-00-00 | CALCULATION OF DOSE EQUIVALENT INDEX EFFECTIVE DOSE EQUIVALENT AND AMBIENT DOSE EQUIVALENT FOR THE GIANT-RESONANCE NEUTRON SPECTRA PRODUCED AT AN ELECTRON ACCELETATOR | 1988 | LNF_88_015(P).pdf | M. PELLICCIONI, A. ZANINI | |
| 880 | 1988-00-00 | TUMORI IN SOGGETTI RADIOESPOSTI E NESSO CAUSALE DI PROBABILITA'(PROBABILITY OF CAUSATION) | 1988 | LNF_88_016(P).pdf | E. RIGHI, M. DI POFI, G. TRENTA | |
| 881 | 1988-00-00 | ASTROMAG AND MANNED COSMIC RAY RESEARCH IN SPACE | 1988 | LNF_88_017(P).pdf | P. SPILLANTINI, B. BASINI | |
| 850 | 1988-00-00 | PRELIMINARY ELECTROMAGNETIC AND CRYOGENIC CALCULATIONS OF SMASH SUPERCONDUCTING COIL | 1988 | LNF_88_018(R).pdf | L. MARITATO, C. SANELLI | |
| 882 | 1988-00-00 | AN ACQUISITION SYSTEM BASED ON A NETWORK OF MICROVAX's RUNNING THE DEC VAXELN OPERATING SYSTEM | 1988 | LNF_88_019(P).pdf | I. D'ANTONE, C. BATTISTA, C. BLOISE, A. GIANNASCA, A.F. GRILLO, E. LAMANNA, G. MANCARELLA, G. MANDRIOLI, A. MARINI, P. MATTEUZZI, O. PALAMARA, S. PETRERA, L. PETRILLO, F. RONGA, G. SANZANI, A. SURDO | |
| 851 | 1988-00-00 | A B FACTORY: WHICH ENERGY IS THE BEST? | 1988 | LNF_88_021(P).pdf | I. PERUZZI | |
| 852 | 1988-00-00 | ZEUS-MUON SPECTROMER TOROID | 1988 | LNF_88_022(NT).pdf | A. CECCHETTI, B. DULACH, I. LAAKSO, G. SUSINNO | |
| 853 | 1988-00-00 | HIGHER ORDER CORRECTIONS QCD JETS: GLUON-GLUON PROCESSES | 1988 | LNF_88_023(PT).pdf | F. AVERSA, P. CHIAPPETTA, M. GRECO, J.PH. GUILLET | |
| 855 | 1988-00-00 | RADIATION PROTECTION PROBLEMS IN THE DESIGN OF THE LISA PROJECT | 1988 | LNF_88_025(R).pdf | M. PELLICCIONI | |
| 856 | 1988-00-00 | STRONG COUPLING EXPANSION IN THE NON-COMPACT FORMULATION OF YANG-MILLS THEORIES ON A LATTICE | 1988 | LNF_88_026.pdf | F. PALUMBO | |
| 884 | 1988-00-00 | QUANTUM STABLE VORTICES IN THE LATTICE (1)-HIGGS MODEL | 1988 | LNF_88_027(PT).pdf | V. AZCOITI, J.L. CORTES, G. DE CARLO, A.G. GRILLO, A. TARANCON | |
| 885 | 1988-00-00 | ELECTROMAGNETIC FIELDS SCATTERED BY A CHARGE MOVING ON THE AXIS OF A SEMI-INFINITE CIRCULAR WAVEGUIDE: RADIATION SPECTRUM AND LONGITUDINAL IMPENDANCE | 1988 | LNF_88_028.pdf | S. KHEIFETS, L. PALUMBO, V. G. VACCARO | |
| 886 | 1988-00-00 | THE USE OF n-HEXANE IN THE GAS MIXTURE FOR STREAMER TUBES | 1988 | LNF_88_029(P).pdf | G. BATTISTONI, V. CHIARELLA, U. DENNI, J. REYNOLDSON | |
| 857 | 1988-00-00 | A GLOW DISCHARGE PROCESS FOR OPTICAL ELEMENTS CLEANING | 1988 | LNF_88_030(R).pdf | I. DAVOLI, ZHU ZHI JI, P. CHIARADIA, S. PRIORI, M. FANFONI | |
| 887 | 1988-00-00 | ETHERFAR: A LONG DISTANCE FIBER OPTIC ETHERNET CONNECTION | 1988 | LNF_88_031(RT).pdf | G. DI PIRRO, L. TRASATTI | |
| 858 | 1988-00-00 | TRANSPORT CRITICAL CURRENT MEASUREMENTS ON Y1 Ba2 Cu3 O7 | 1988 | LNF_88_032(R).pdf | U. GAMBARDELLA, G. PATERNO' | |
| 888 | 1988-00-00 | NEUTRINO MASS DETERMINATION BY b DECAY SPECTRUM/ PRESENT AND FUTURE SITUATION | 1988 | LNF_88_033.pdf | F. CELANI, F. CARDONE, S. PACE | |
| 859 | 1988-00-00 | CIRCUITO DISCRIMINATORE DI SEGNALI ANALOGICO-NIM | 1988 | LNF_88_034(NT).pdf | G. CORRADI, M. CARLETTI, A. BALLA, G. FELICI, G. NICOLETTI | |
| 860 | 1988-00-00 | IL SISTEMA DI DISTRIBUZIONE HV UTILIZZATO NELL'ESPERIMENTO ALEPH | 1988 | LNF_88_035(NT).pdf | G. CORRADI, A. BALLA, M. CARLETTI, G. FELICI, N. NICOLETTI | |
| 889 | 1988-00-00 | Au PHOTOFISSION CROSS SECTION BY QUASI-MONOCHROMATIC PHOTONS IN THE INTERMEDIATE ENERGY REGION | 1988 | LNF_88_036(P).pdf | V. LUCHERINI, C. GUARALDO, E. DE SANCTIS, P. LEVI-SANDRI, E. POLLI, A. R. REOLON, A. S. ILJINOV, S. LO NIGRO, S. AIELLO, V. BELLINI, V. EMMA, C. MILONE, G. S. PAPPALARDO, M. V. MEBEL | |
| 861 | 1988-00-00 | MEDIUM INFRARED TRENSMITTANCE AND REFLECTANCE SPECTRA OF Bi12GeO20, Bi12SiO20, AND Bi12TiO20 SINGLE CRYSTALS | 1988 | LNF_88_037.pdf | E. BURATTINI, G. CAPPUCCIO, M.C. FERRARI, M. GRANDOLFO, P. VECCHIA, Sh. M. EFENDIEV | |
| 890 | 1988-00-00 | SURFACE AND UNDERGROUND EXPERIMENTS AT THE GRAN SASSO | 1988 | LNF_88_038(P).pdf | B. D'ETTORRE-PIAZZOLI | |
| 891 | 1988-00-00 | PARTICLE DYNAMICS IN THE 100 KeV INJECTOR OF LISA | 1988 | LNF_88_039(R).pdf | C. BISCARI | |
| 893 | 1988-00-00 | ON THE FIELD COOLED SUSCEPTIBILITY OF SUPERCONDUCTING YBaCuO SAMPLES | 1988 | LNF_88_041(P).pdf | F. CELANI, R. MESSI, N. SPARVIERI, S. PACE, A. SAGGESE, C. GIOVANNELLA, L. FRUCHTER, C. CHAPPERT, I.A. CAMPBELL | |
| 894 | 1988-00-00 | POLARIZED CURVED WAVE EXAFS: Theory and Application | 1988 | LNF_88_042(PT).pdf | M. BENFATTO, C.R. NATOLI, C. BROUDER, R.F. PETTIFER, M.F. RUIZ LOPEZ | |
| 895 | 1988-00-00 | A STUDY OF LOW HYDROCARBON CONTENT GAS MIXTURE FOR STREAMER TUBES | 1988 | LNF_88_043(P).pdf | R. BALDINI-CELIO, C. BENCIVENNI, F. BOSSI, P. CAMPANA, G. CAPON, G. DE NINNO, B. D' ETTORRE - PIAZZOLI, G. FELICI, P. LAURELLI, G. MANNOCCHI, F. MURTAS, G. P. MURTAS, G. NICOLETTI, P. PICCHI, H. RIGONI | |
| 896 | 1988-00-00 | A NEW MODEL FOR ELASTIC DEUTERON-DEUTERON SCATTERING | 1988 | LNF_88_044(PT).pdf | E. ETIM, L. SATTA | |
| 897 | 1988-00-00 | TRACKING TECHNIQUES IN UNDERGROUND PHYSICS | 1988 | LNF_88_045(P).pdf | G. BATTISTONI | |
| 843 | 1988-00-00 | A FAST, LOW POWER CONSUMPTION READOUT SYSTEM FOR A SPACE BASED CALORIMETER | 1988 | LNF_88_046(P).pdf | G. BASINI, F. BONGIORNO, A. MORSELLI, M. OCCHIGROSSI, M. RICCI, P. SPILLANTINI, A. CODINO, G. GRIMANI, M. MENICHELLI, E. RONGONI, I. SALVATORI, P. PICOZZA, L. DE BORTOLI, C. BIANCHI | |
| 898 | 1988-00-00 | TORQUE MEASUREMENTS OF TEXTURED Y1Ba2Cu3O7-x SINTERED PELLETS | 1988 | LNF_88_047(P).pdf | F. CELANI, L. FRUCHTER, C. GIOVANNELLA, R. MESSI, S. PACE, A. SAGGESE, N. SPARVIERI | |
| 899 | 1988-00-00 | A MODEL OF AN APPLICATION RELAY FOR FILE TRANSFER, ACCESS, AND MANAGEMENT | 1988 | LNF_88_048(P).pdf | M.L. FERRER, E.PACE, G. MIRABELLI, E. VALENTE | |
| 900 | 1988-00-00 | DOUBLE-ELECTRON EXITATION AT THE Si K-EDGE OF AMORPHOUS SILICON | 1988 | LNF_88_049.pdf | A. FILIPPONI, E. EVANGELISTI, E. BERNIERI, S. MOBILIO | |
| 901 | 1988-00-00 | FORWARD AND BACKWARD ANGLES DIFFERENTIAL CROSS SECTION FOR DEUTERON PHOTODISINTEGRATION AT INTERMEDIATE ENERGIES | 1988 | LNF_88_050(P).pdf | P. LEVI- SANDRI, M. ANGHINOLFI, N. BIANCHI, G.P. CAPITANI, P. CORVISIERO, E. DE SANCTIS, C. GUARALDO, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A. R. REOLON, G. RICCO, P. ROSSI, M. SANZONE, M. TAIUTI | |
| 862 | 1988-00-00 | REALIZZAZIONE E PRIMA CARATTERIZZAZIONE DI FILM SOTTILI DI NIOBIO CON TECNICHE DI SPUTTERING | 1988 | LNF_88_051(NT).pdf | R. CECCARELLI, M. DE GIORGI, S. FAINI, G. FIORE, R. LANZI, L. MARITATO | |
| 864 | 1988-00-00 | HIGHER-ORDER CORRECTIONS TO QCD JETS | 1988 | LNF_88_053.pdf | F. AVERSA, P. CHIAPPETTA, M. GRECO, J.PH. GUILLET | |
| 865 | 1988-00-00 | NUOVI IMPIANTI PER IL BUMPER RAPIDO E IL DEFLETTORE DI "ADONE" | 1988 | LNF_88_055(NT).pdf | S. DE SIMONE | |
| 844 | 1988-00-00 | SEARCH FOR COSMIC ANTIMATTER.GOALS AND TECHNIQUES | 1988 | LNF_88_056(P).pdf | G. BASINI, P. SPILLANTINI | |
| 903 | 1988-00-00 | O (a') CONFORMAL ANOMALY AND STRING THEORY EFFECTIVE ACTION FOR s-MODELS WITH TORSION | 1988 | LNF_88_057.pdf | S. BELLUCCI | |
| 866 | 1988-00-00 | ON THE EXCITATION ENERGY DEPENDENCE OF PHOTO-FISSILITY INPREACTINIDE NUCLEI | 1988 | LNF_88_058(P).pdf | C. GUARALDO, V. LUCHERINI, E. DE SANCTIS, A.S. ILJINOV, M.B. MEBEL, S. LO NIGRO | |
| 904 | 1988-00-00 | LIGHT NUCLEUS PRODUCTION IN p4 He ANNIHILATION BETWEEN 0 AND 600 MeV/c. | 1988 | LNF_88_059.pdf | F. BALESTRA, S. BOSSOLASCO, M.P. BUSSA, L. BUSSO, L. FAVA, L. FERRERO, D. PANZIERI, G. PIRAGINO, F. TOSELLO, R. BARBIERI, G. BENDISCIOLI, R. ROTONDI, P. SALVINI, A. ZENONI, YU. A. BATUSOV, I.V. FALOMKIN, F. NICHITIU, G.B. PONTECORVO, M.G. SAPOZHNIKOV, V.I. TRETYAK, C. GUARALDO, A. MAGGIORA, E. LODI RIZZINI, A. HAATUFT, A. HALSTEINSLID, K. MYKLEBOST, J.M. OLSEN, F.O. BREIVIK, T. JACOBSEN, S.O. SORENSEN | |
| 905 | 1988-00-00 | OPTIMIZATION OF A SYNCHROTRON BASED X-RAY LITHOGRAPHIC SYSTEM | 1988 | LNF_88_060(P).pdf | E. BERNIERI, A. BALERNA | |
| 906 | 1988-00-00 | FABRICATION PROCESS AND SUPERCONDUCTING BEHAVIOR OF SINTERED Y1Ba2Cu3O7 CERAMIC SAMPLES | 1988 | LNF_88_061(P).pdf | U. GAMBARDELLA, G. PATERNO', C. ALVANI, S. CASADIO | |
| 907 | 1988-00-00 | PYROLYTIC CITRATE SYNTHESIS AND OZONE ANNEALING: TWO KEY STEPS TOWARD THE OPTIMIZATION OF SYNTERED YBCO | 1988 | LNF_88_062(P).pdf | F. CELANI, W.I.F. DAVID, C. GIOVANNELLA, R. MESSI, V. MERLO, S. PACE, A. SAGGESE, N. SPARVIERI | |
| 867 | 1988-00-00 | ORIENTATIONAL DISORDER IN AMORPHOUS SILICON PROBED BY XANES (X-RAY ABSORPTION NEAR EDGE STRUCTURE) | 1988 | LNF_88_063.pdf | A. DI CICCO, A. BIANCONI, M. BENFATTO, A. MARCELLI, C.R. NATOLI, P. PIANETTA, J. WOICIK | |
| 908 | 1988-00-00 | A SUPERCONDUCTING MICROWAVE ONDULATOR | 1988 | LNF_88_064(P).pdf | R. BONI, A. SAVOIA, B. SPATARO, F. TAZZIOLI, P. FABBRICATORE, R. PARODI, P. FERNANDES | |
| 919 | 1988-00-00 | STUDY OF HADRONIC J/y DECAYS INVOLVING AND w PRODUCTION | 1988 | LNF_88_065.pdf | A. FALVARD, Z. AJALTOUNI, H. JNAD, J. JOUSSET, B. MICHEL, J.C. MONTRET, R. BALDINI, A. CALCATERRA, G. CAPON, J.E. AUGUSTIN, G. COSME, F. COUCHOT, F. FULDA, G. GROSDIDIER, B. JEAN-MARIE, V. LEPELTIER, F. MANE, G. SZKLARZ, D. BISELLO, G. BUSETTO, L. PESCARA, P. SARTORI, L. STANCO | |
| 909 | 1988-00-00 | NONCOMPACT FORMULATION OF YANG-MILLS THEORIES ON A LATTICE | 1988 | LNF_88_066(PT).pdf | F. PALUMBO | |
| 910 | 1988-00-00 | COMPARISON OF FISSION OF HEAVY NUCLEI INDUCED BY DIFFERENT PROBES | 1988 | LNF_88_067(P).pdf | A. S. ILJINOV, M. V. MEBEL, C. GUARALDO, V. LUCHERINI, E. DE SANCTIS, S. LO NIGRO, N. BIANCHI, P. LEVI SANDRI, V. MUCCIFORA, E. POLLI, A. R. REOLON, P. ROSSI | |
| 912 | 1988-00-00 | DOUBLE-ELECTRON EXCITATION AT THE Si K-EDGE OF AMORPHOUS SILICON | 1988 | LNF_88_069.pdf | A. FILIPPONI, E. EVANGELISTI, E. BERNIERI, S. MOBILIO | |
| 868 | 1988-00-00 | STUDY OF THE GLASS TRANSITION REGION IN AMORPHOUS SELENIUM BY EXAFS | 1988 | LNF_88_070.pdf | M. FEDERICO, G. GALLI, S. MAGAZU', D. MAJOLINO, E. BURATTINI | |
| 913 | 1988-00-00 | OZONE ANNEALING OF YBCO SUPERCONDUCTORS: TOWARD THE MAXIMUM OF DIAMAGNETIC Tc AND MINIMUM OF D Tc | 1988 | LNF_88_071(P).pdf | F. CELANI, L. LIBERATORI, R. MESSI, S. PACE, A. SAGGESE, N. SPARVIERI | |
| 914 | 1988-00-00 | MULTIELECTRON EXCITATIONS IN X-RAY-ABSORPTION SPECTRA OF a-Si:H | 1988 | LNF_88_072.pdf | A. FILIPPONI, E. BERNIERI, S. MOBILIO | |
| 915 | 1988-00-00 | FINAL REPORT ON THE LELA EXPERIMENT | 1988 | LNF_88_073.pdf | N. CAVALLO, F. CEVENINI, M.R. MASULLO, M. CASTELLANO, S. GUIDUCCI, P. PATTERI, M.A. PREGER, M. SERIO | |
| 916 | 1988-00-00 | LOOKING AT CP INVARIANCE AND QUANTUM MECHANICS IN J/y Æ LLDECAY | 1988 | LNF_88_074.pdf | M.H. TIXIER, Z. AJALTOUNI, A. FALVARD, J. JOUSSET, B. MICHEL, J.C. MONTRET, D. PALLIN, A. ANTONELLI, R. BALDINI, J.E. AUGUSTIN, G. COSME, F. COUCHOT, F. FUDA, G. GROSDIDIER, B. JEAN-MARIE, V. LEPELTIER, F. MANE, G. SZKLARZ, D. BISIELLO, G. BUSETTO, L. PESCARA, P. SARTORI, L. STANCO | |
| 918 | 1988-00-00 | A CALORIMETER COUPLED WITH A MAGNETIC SPECTROMETER FOR THE DETECTION OF PRIMARY COSMIC ANTIPROTONS | 1988 | LNF_88_076.pdf | G. BASINI, A. MORSELLI, M. OCCHIGROSSI, M. RICCI, P. SPILLANTINI, F. BONGIORNO, P. PICOZZA, A. CODINO, M. MENICHELLI, S. BARTALUCCI | |
| 869 | 1988-00-00 | ELECTRONIC AND SUPERCONDUCTING PROPERTIES OF Mo-Ta SUPERLATTICES | 1988 | LNF_88_077.pdf | L. MARITATO, A.M. CUCOLO, R. VAGLIO, C. NOCE, J.L. MAKOUS CHARLES, M. FALCO | |
| 5651 | 1987-12-21 | OPERATOR PRODUCT ALGEBRAS IN 2D-CONFORMAL THEORIES WITH C < 1 CENTRAL CHARGE. | 1987 | INFN-AE-87-6.pdf | V.B. Petkova. | A generalized integral representation involving two types of charges is explored to construct correlation functions on the plane for c = 1 - 6/ m(m+l) < 1 discrete unitary Virasoro series. The various local operator product algebras emerging contain (half)-integer spin fields. The examples include also a generalization for arbitrary m of the Z<sub>2</sub> - statistics of the Ising model order - disorder fields. |
| 3641 | 1987-11-25 | Simulation of the motion of charged particles in the drift tube of the 'trap' experiment. (Measurement of the gravitational acceleration of the antiproton) | 1987 | INFN-TC_87-14.pdf | A. De Angelis, F. Scruri, F. Waldener | |
| 3640 | 1987-11-19 | Proposta di RFQ a energia variabile | 1987 | INFN-TC_87-13.pdf | A Fabris, A. Massarotti | |
| 3623 | 1987-10-16 | Charge collection in partially depleted silicon detectors | 1987 | INFN-AE_87-5.pdf | F. Fontanelli, P. Ramella, S. Vitale | |
| 3639 | 1987-10-06 | A VME pressure regulation system for gas detectors | 1987 | INFN-TC_87-12.pdf | R. Bassani, C. Boiano, S. Brambilla, I. Iori, A. Moroni, Zhang Yinji | |
| 3638 | 1987-10-01 | Optimization of the shape of the HV electrode of the electrostatic deflectors for the Milan superconducting cyclotron | 1987 | INFN-TC_87-11.pdf | C. De Martinis, A. Ferrari | |
| 3627 | 1987-10-01 | Table of nuclear magnetic moments fast abrasion model | 1987 | INFN-BE_87-3.pdf | F.J. Rico, C. Rossi-Alvarez | The unique features (super-low background and large sensitive volume) of the CTF and BOREXINO set ups are used in the CAMEO project for a high sensitivity study of $^{100}Mo$ and $^{116}Cd$ neutrinoless $2\beta$ decay. Pilot measurements with $^{116}Cd$ and Monte Carlo simulations slow that the sensitivity of the CAMEO experiment (in terms of the half-life limit for $0\nu2\beta$ decay) is $(3-5)\bullet 10^{24}$ yr with a 1 kg source of $^{100}Mo$ ($^{116}Cd$, $^{82}Se$, and $^{150}Nd$) and \approx $10^{26}$ yr with 65 kg of enriched $^{116}CdWO_{4}$ crystals placed in the liquid scintillator of the CTF. The last value corresponds to a limit on the neutrino mass of $m_{\nu} \leq 0.06 \; eV$. Similarly with 1000 kg of $^{116}CdWO_{4}$ crystals located in the BOREXINO apparatus the neutrino mass limit can be pushed down to $m_{\nu} \leq 0.02$ eV}. |
| 3637 | 1987-09-04 | Strutture convertitrici per l'ottimizzazione della rivelazione della radiazione X di sincrotrone mediante dispositivi a CCD | 1987 | INFN-TC_87-10.pdf | G. Zanella, R. Zannoni | |
| 3636 | 1987-09-04 | The automatic test system for the L3 muon drift chamber amplifier | 1987 | INFN-TC_87-9.pdf | A. Bove, L. Caiazzo, S. Lanzano, F. Manna, G. Manto, L. Parascandolo, P. Parascadolo, A. Parmentola, G. Paternoster | |
| 5650 | 1987-06-22 | CONSIDERATIONS ON INSTALLING A STRONG SOLENOID IN A LOW ENERGY STORAGE RING. | 1987 | INFN-AE-87-4.pdf | J. Kewisch, H. Kreiser, T. Niinikoski, Y. Onel, A. Penzo, R. Rossmanith. | Recently a method was proposed to polarize the stored antiprotons in LEAR. Particles with different spins are separated by a device called spin-splitter consisting of skew-quadrupoles and a strong solenoid. In this paper it is shown in principle that the spin splitter with its strong solenoid field can be integrated into a low energy storage ring such as LEAR, without long changes in the optics. |
| 3635 | 1987-06-15 | Realizzazione di schede elettroniche con tecniche di wirewrap e multiwiring | 1987 | INFN-TC_87-8.pdf | A. Castelvetri, E. Remiddi | |
| 3634 | 1987-06-12 | BIG- A Binary Generator | 1987 | INFN-TC_87-7.pdf | M. Annunziata, W. Bragagnini, P. Guazzoni, G. Sechi, G.F. Taiocchi, L. Zetta | |
| 3633 | 1987-05-22 | Estensione della facility Marisa da 6 a 10 Tesla studio di fattibilità prima parte: Il magnete | 1987 | INFN-TC_87-6.pdf | P. Fabbricatore | |
| 3632 | 1987-05-21 | Progettazione formalizzazione ed analisi comparativa di algoritmi di ordinamento interno di complessità ottimale | 1987 | INFN-TC_87-5.pdf | C. Riperi | |
| 3630 | 1987-04-22 | Liquid nitrogen cool down on the cryostat of the Milan superconducting cyclotron | 1987 | INFN-TC_87-3.pdf | F. Alessandria, M. Cacifi, G. Rivoltella, L. Rossi, M. Todero | |
| 3629 | 1987-03-30 | An adiabathic demagnetization cryostat for device testing | 1987 | INFN-TC_87-2.pdf | S. Vitale, C. Ferdignini, G. Gallinaro, F. Gatti, A. Siri | |
| 3628 | 1987-03-26 | A microvax-VME interface | 1987 | INFN-TC_87-1.pdf | I. D'Antone, P. Giacomelli, G. Mandrioli, G. Sanzani | |
| 3621 | 1987-03-25 | Magnetic monoples without strings | 1987 | INFN-AE_87-3.pdf | A. Maia, E. Recami, W.A.Rodrigues, M.A.F. Rosa | |
| 5649 | 1987-03-16 | THE EUROPEAN HADRON FACILITY. | 1987 | INFN-AE-87-2.pdf | F. Bradamante. | The European Hadron Facility (EHF) is a new research facility for nuclear and particle physics which is proposed for Western Europe in the 1990's. It consists of a complex of accelerators to produce a high-intensity (100μA) proton beam of 30 GeV kinetic energy, and is meant to provide a broad range of intense, high-quality secondary beams of neutrinos, muons, pions, kaons and antiprotons. A distinctive feature of this machine is that it has been designed to accelerate polarized proton beams to full energy. The physics case for the project has been studied over almost three years by a group of European physicists, the EHF Study Group (the present composition of the group is given in Table 1), and has been reviewed and discussed at many workshops, topical seminars and conferences. The first of these was the workshop on 'the Future of Intermediate Energy Physics in Europe' , held in Freiburg im Breisgau in 1984 [1], and important milestones since then have been the Workshop on Nuclear and Particle Physics at Intermediate Energies with Hadrons, held in Miramare (Trieste) [2], the meeting on 'The future of Medium and High-Energy-Physics in Switzerland', held at Les Rasses [3], and the series of Heidelberg Workshops on the Physics of Hadron and Nuclear Structure [4]. All these activities culminated in the International Conference on a European Hadron Facility, held in Mainz from 10 to 14 March, 1986, the main purpose of which was to review the physics program in both low-energy particle physics and in modern nuclear physics, with special emphasis on strong interactions in the confinement regime of quantum chromodynamics (QCD)[5]. A 'Letter of Intent' was subsequently written [6] by the EHF Study Group to provide concise information on the proposed machine and on the Physics case. Since August, the Study Group has been actively engaged in the preparation of a detailed Proposal, which should be ready by April '87, and which will consist of the machine study I will briefly summarize in this talk and of a selection of first-generation experiments which the European Users would like to carryon at the new facility. The Physics area which have been identified to this purpose and the names of the physicists who have volunteered as conveners to coordinate the work of the respective working groups are listed in Table 2. The physics case for the EHF is extremely good and well demonstrated, as evidenced also by the existence of similar projects in North America (at Los Alamos [7] and at TRIUMF [8])and in Japan [9]. It is also clear by now that there is a strong and competent community of European physicists keen to build this facility in Europe, and for this reason the EHF study group urged in the summer of '85 a feasibility study of a 'siteless-EHF', i.e. a facility which might be built anywhere in Europe and would not assume any particular existing accelerator as injector. |
| 3626 | 1987-03-11 | Recoil range studies of reaction mechanisms | 1987 | INFN-BE_87-2.pdf | E. Gadioli, E. Gadioli Erba, D.J. Parker | |
| 3631 | 1987-03-04 | The extraction system for the Milan superconducting cyclotron | 1987 | INFN-TC_87-4.pdf | E. Fabrici, A. Salomone | |
| 3625 | 1987-02-19 | A simplified geometrical approach to the fast abrasion model | 1987 | INFN-BE_87-1.pdf | G. Lanzanò, A. Pagano, R.A.Dayras, F. Gadi | |
| 3619 | 1987-01-13 | A note on the vertex program | 1987 | INFN-AE_87-1.pdf | M. Leopold | |
| 946 | 1987-00-00 | CYGNUS X-3 MUON SIGNAL IN THE NUSEX EXPERIMENT | 1987 | LNF_87_001(P).pdf | B. D'ETTORRE-PIAZZOLI | |
| 947 | 1987-00-00 | THE INTERATOMIC INTERMEDIATE VALENCE STATE OF INSULATING CORRELATED OXIDES CeO2, PrO2 AND TbO2 | 1987 | LNF_87_002(P).pdf | A. BIANCONI, I. DAVOLI, S. DELLA LONGA, J. GARCIA, K.B. GARG, A. KOTANI, A. MARCELLI | |
| 948 | 1987-00-00 | PHOTOEXCITATION MECHANISMS AND PHOTOFISSION CROSS SECTION FOR Bi BY 100÷300 MeV QUASI-MONOCHROMATIC PHOTONS | 1987 | LNF_87_003(P).pdf | C. GUARALDO, V. LUCHERINI, E. DE SANCTIS, P. LEVI-SANDRI, E. POLLI, A. R. REOLON, S. LO NIGRO, S. AIELLO, V. BELLINI, V. EMMA, C. MILONE, G. S. PAPPALARDO | |
| 924 | 1987-00-00 | ROTO-TRANSLAZIONE DI FIGURE BI-TRIDIMENSIONALI CON LA STAZIONE GRAFICA WHIZZARD 7200 DELLA MEGATEK. APPLICAZIONE: PROGRAMMA PER IL DISPLAY E L'ANALISI INTERATTIVA DEI DATI DEL MICROVERTEX DI UA1 | 1987 | LNF_87_004(R).pdf | G. CIAPETTI, R. COLINI, M. PISTONI, L. ZANELLO | |
| 925 | 1987-00-00 | LA PROGETTAZIONE DEL CIRCUITO STAMPATO NEL LABORATORIO FOTOGRAFICO E CIRCUITI STAMPATI DEI LNF | 1987 | LNF_87_005(NT).pdf | D. RIONDINO | |
| 926 | 1987-00-00 | DESIGN STUDY FOR THE TRIESTE SYNCHROTRON LIGHT SOURCE | 1987 | LNF_87_006(R).pdf | S. TAZZARIADONE Group | |
| 950 | 1987-00-00 | COORDINATION GEOMETRY OF TRANSITION METAL IONS IN DILUITE SOLUTIONS BY XANES | 1987 | LNF_87_008.pdf | J. GARCIA, A. BIANCONI, M. BENFATTO, C.R. NATOLI | |
| 951 | 1987-00-00 | LARGE TRANSVERSE MOMENTUM W PRODUCTION AT HADRON COLLIDERS | 1987 | LNF_87_009(PT).pdf | S. GEER, G. PANCHERI, Y.N. SRIVASTAVA | |
| 952 | 1987-00-00 | RISCHIO DA CAMPI MAGNETICI STATICI: I LIMITI DI ESPOSIZIONE | 1987 | LNF_87_010(P).pdf | E. RINGHI | |
| 953 | 1987-00-00 | AMORPHOUR HYDROGENATED ALLOY: A COMPARATIVE EXAFS STUDY OF a-Si1-xCx:H, a-Si1-xGex:H, a-SiNx:H AT THE SILICON K-EDGE | 1987 | LNF_87_011.pdf | A. FILIPPONI, P. FIORINI, F. EVANGELISTI, A. BALERNA, S. MOBILIO | |
| 954 | 1987-00-00 | NUMERICAL EVIDENCE FOE SPONTANEOUS BREAKING OF CHARGE CONJUGATION IN THE HIGGS PHASE OF THE STANDARD U(1) - HIGGS MODEL | 1987 | LNF_87_012(PT).pdf | V. AZCOITI, J.L. CORTES | |
| 955 | 1987-00-00 | CONFINEMENT AND VACUUM STRUCTURE IN COMPACT QED ON THE LATTICE | 1987 | LNF_87_013.pdf | V. AZCOITI | |
| 927 | 1987-00-00 | METODI DI CALCOLO DI ONDULATORI IN VISTA DELLA COSTRUZIONE DI UN MODELLO DI LINAC S.C. CON UN ESPERIMENTO DI FREE ELECTRON LASER | 1987 | LNF_87_014(R).pdf | A. CATTONI, C. SANELLI | |
| 928 | 1987-00-00 | PROCESSORE CONTROLLORE VME MONOSCHEDA | 1987 | LNF_87_015(NT).pdf | V. CARLOTTI, M. COLI, L. TRASATTI | |
| 956 | 1987-00-00 | MEASUREMENT AND STEERING OF BEAM POSITION IN ADONE | 1987 | LNF_87_016(P).pdf | A. ARAGONA, C. BISCARI, S. DE SIMONE, E. GIANFELICE, S. GUIDUCCI, V. LOLLO, S. PELLA, M. PREGER, M. SERIO | |
| 929 | 1987-00-00 | AN EXPERIMENT TO MEASURE THE ELECTROMAGNETIC FORM FACTORS OF THE NEUTRON IN THE TIME-LIKE REGION AT ADONE | 1987 | LNF_87_018(R).pdf | FENICE Collaboration:A. ANTONELLI, R. BALDINI - FERROLI, M. E. BIAGINI, V. BIDOLI, T. BRESSANI, R. CALABRESE, R. CARDARELLI, R. CARLIN, C. CERNIGOI, S. COSTA, L. CUGUSI, B. DAINESE, P. DALPIAZ, S. DE SIMONI, G. DE ZORZI, U. DOSSELLI, B. DULACH, P. FERRETTI-DALPIAZ, R. GIANTIN, S. GUIDUCCI, F. IAZZI, E. LUPPI, S. MARCELLO, A. MASONI, G. MILANI, B. MINETTI, M. MORANDIN, M. NIGRO, L. PAOLUZI, G. PAULI, F. PETRUCCI, G. PITACCO, M. POSOCCO, M. A. PREGER, G. PUDDU, L. SANTI, R. SANTONICO, P. SARTORI, M. SAVRIE', M. SCHIOPPA, S. SERCI, M. SERIO, M. SPINETTI, L. TECCHIO, V. TRICOMI, C. VOCI | |
| 958 | 1987-00-00 | CALIBRATION OF AN ANISOTROPIC NEUTRON DETECTOR | 1987 | LNF_87_019(P).pdf | A. RINDI, S. MIOZZI, F. CELANI | |
| 959 | 1987-00-00 | KILLING SYMMETRIES FROM THE LANGEVIN EQUATION | 1987 | LNF_87_020(PT).pdf | E. ETIM | |
| 960 | 1987-00-00 | THE CASE OF H PARTICLE | 1987 | LNF_87_021(P).pdf | C. GUARALDO | |
| 961 | 1987-00-00 | OPEN PROBLEMS IN (e+e-) HADRON PRODUCTION BELOW 3 GeV | 1987 | LNF_87_022(P).pdf | R. BALDINI-FERROLI | |
| 962 | 1987-00-00 | STREAMER TUBES: FEATURE AND THEIR USE | 1987 | LNF_87_023(P).pdf | M. SPINETTI | |
| 963 | 1987-00-00 | ELECTRON STORAGE RINGS FOR THE PRODUCTION OF SYNCHROTRON RADIATION | 1987 | LNF_87_024(P).pdf | S. TAZZARI | |
| 964 | 1987-00-00 | INTRINSIC RESOLUTION OF SUPERCONDUCTING TUNNEL JUNCTIONS USED AS IONIZING PARTICLE DETECTORS | 1987 | LNF_87_025(P).pdf | S. PACE, F. CELANI, A. GIORGI, A. SAGGESE, S. PAGANO | |
| 930 | 1987-00-00 | RAPPORTO ATTIVITA' 1986 | 1987 | LNF_87_026(R).pdf | Curato dal Servizio Documentazione | |
| 965 | 1987-00-00 | S.CO.W. SUPERCONDUCTING WIGGLER FOR ADONE | 1987 | LNF_87_027.pdf | A. ARAGONA, A. CATTONI, S. FAINI, G. MODESTINO, M. PREGER, C. SANELLI, A. SAVOIA, F. SGAMMA, G. TURCHETTI | |
| 966 | 1987-00-00 | LELA: A FREE ELECTRON LASER ON ADONE | 1987 | LNF_87_028.pdf | M. AMBROSIO, G.C. BARBARINO, M. CASTELLANO, N. CAVALLO, F. CEVENINI, M.R. MASULLO, S. GUIDUCCI, P. PATTERI, M. PREGER | |
| 967 | 1987-00-00 | SMALL ANGLE X-RAY SCATTERING APPARATUS WITH THREE-DIMENSIONAL IMAGING GAS DETECTOR | 1987 | LNF_87_029.pdf | A. LA MONACA, M. IANNUZZI, R. MESSI | |
| 968 | 1987-00-00 | EXAFS IN A DISPERSIVE MODE | 1987 | LNF_87_030.pdf | A. BALERNA, S. MOBILIO, A. MERLINI | |
| 969 | 1987-00-00 | MONOCHROMATIC AND POLARIZED TAGGED LADON GAMMA RAY BEAM AT THE ESRF MACHINE | 1987 | LNF_87_031.pdf | M. PREGER, B. SPATARO, R. BERNABEI, M.P. DE PASCALE, C. SCHAERF | |
| 970 | 1987-00-00 | FIRST X-RAY DIFFRACTION EXPERIMENTAL RESULTS AT THE ADONE WIGGLER LINE BX1 | 1987 | LNF_87_032.pdf | E. BURATTINI, E. BERNIERI, G. CAPPUCCIO, M. COLAPIETRO, C. MARCIANTE, A. PIFFERI, R. SPAGNA | |
| 971 | 1987-00-00 | THE ADONE WIGGLER SOFT X-RAY BEAM LINE | 1987 | LNF_87_033.pdf | E. BURATTINI, A. BALERNA, E. BERNIERI, C. MENCUCCINI, R. RINZIVILLO, CHEN QUAN-HONG | |
| 972 | 1987-00-00 | UNIFIED SCHEME OF INTERPRETATION OF THE X-RAY ABSORPTION SPECTRA BASED ON THE MULTIPLE SCATTERING FORMALISM | 1987 | LNF_87_034.pdf | M. BENFATTO, C.R. NATOLI | |
| 973 | 1987-00-00 | COORDINATION GEOMETRY OF TRANSITION METAL IONS IN DILUTE SOLUTIONS BY XANES | 1987 | LNF_87_035.pdf | J. GARCIA, M. BENFATTO, A. BIANCONI, A. CLOZZA, C.R. NATOLI | |
| 974 | 1987-00-00 | MULTIELECTRON TRANSITIONS ON X-RAY ABSORPTION SPECTROSCOPY | 1987 | LNF_87_036.pdf | E. BERNIERI, A. BALERNA, S. MOBILIO, E. BURATTINI | |
| 975 | 1987-00-00 | LIGAND BONDING ANGLE IN HEMOPROTEINS BY XANES SPECTROSCOPY | 1987 | LNF_87_037.pdf | A. CONGIU-CASTELLANO, A. BIANCONI, M. DELL'ARICCIA, A. GIOVANNELLI, S. DELLA LONGA, E. BURATTINI, G. GIACOMETTI, S. MORANTE | |
| 976 | 1987-00-00 | CALCIUM BINDING SPECIFICITY AND LOCAL STRUCTURE IN CALCIUM MODULATED PROTEINS BY HIGH RESOLUTION XANES AND EXAFS SPECTROSCOPY | 1987 | LNF_87_038.pdf | A. GIOVANNELLI, I. ASCONE, A. BIANCONI, A. CONGIU, S. ALEMA', P. FASELLA | |
| 977 | 1987-00-00 | OXIGEN K EDGE AND LOCAL STRUCTURE OF AMORPHOUS SiO2 | 1987 | LNF_87_039.pdf | A. GARGANO, M. BENFATTO, A. BIANCONI, I. DAVOLI, P. CHIARADIA, M. FANFONI, J. GARCIA, A. MARCELLI, C.R. NATOLI | |
| 978 | 1987-00-00 | FINAL STATES AND INTERMEDIATE VALENCE IN XANES OF INSULATING RARE EARTH OXIDES | 1987 | LNF_87_040.pdf | A. MARCELLI, A. BIANCONI, J. GARCIA, I. DAVOLI | |
| 979 | 1987-00-00 | EXAFS INVESTIGATIONS ON AN NH2-TERMINAL FRAGMENTS OF HUMAN TRANSFERRIN CONTAINING A SINGLE IRON BINDING SITE | 1987 | LNF_87_041.pdf | I. BERTINI, S. MANGANI, L. MESSORI, S. MOBILIO, P.L. ORIOLI | |
| 980 | 1987-00-00 | INTERACTION OF DNA WITH Cu IONS | 1987 | LNF_87_042.pdf | M. BELLI, M. MATZEU, A. SCAFATI, A. BALERNA, E. BERNIERI, S. MOBILIO, G. ONORI, A. REALE, A. BIANCONI | |
| 981 | 1987-00-00 | VANADIUM SITE STRUCTURE IN V205 GEL BY POLARIZED EXAFS AND XANES | 1987 | LNF_87_043.pdf | S. STIZZA, M. BENFATTO, A. CLOZZA, J. GARCIA | |
| 982 | 1987-00-00 | SURFACE XANES AT OXIGEN K-EDGE OF OXIDE GROWN ON NICKEL | 1987 | LNF_87_044.pdf | I. DAVOLI, M. TOMELLINI, M. FANFONI, A. MARCELLI, A. BIANCONI | |
| 983 | 1987-00-00 | EXAFS STUDY OF SPUTTERED Pd CLUSTERS | 1987 | LNF_87_045.pdf | M. DIOCIAIUTI, C. MILARDI, P. PICOZZI, S. SANTUCCI, A. BALERNA, S. MOBILIO | |
| 984 | 1987-00-00 | A NEW FORMULATION OF THE EXAFS DEBYE-WALLER FACTOR FOR THE DETERMINATION OF THE DYNAMICAL PROPERTIES OF SMALL GOLD CLUSTERS | 1987 | LNF_87_046.pdf | A. BALERNA, S. MOBILIO | |
| 985 | 1987-00-00 | Te ENVIROMENT IN DOPED Fe2(Mo04)3 BY EXAFS | 1987 | LNF_87_047.pdf | F. GARAGIOLA, P.L. VILLA, S. MOBILIO, G. VLAIC | |
| 986 | 1987-00-00 | EXAFS STRUCTURAL STUDIES OF AROMATIC POLYMERS/RUTHENIUM CATALYSTS | 1987 | LNF_87_048.pdf | G. DALBA, P. FORNASINI, F. ROCCA, E. BURATTINI, P. PERTICI | |
| 987 | 1987-00-00 | X-RAY ABSORPTION SPECTRA OF Xe IN Xe+ IMPLANTED SILICON | 1987 | LNF_87_049.pdf | G. FARACI, A.R. PENNISI, A. TERRASI, A. BALERNA, S. MOBILIO | |
| 988 | 1987-00-00 | EXAFS OF TERNARY SEMICONDUCTORS | 1987 | LNF_87_050.pdf | A. BALZAROTTI, N. MOTTA, P. LETARDI | |
| 989 | 1987-00-00 | XAS ON FAST ION CONDUCTOR SILVER BORATE GLASSES | 1987 | LNF_87_051.pdf | G. DALBA, P. FORNASINI, F. ROCCA, E. BURATTINI | |
| 990 | 1987-00-00 | AMORPHOUS HYDROGENATED ALLOYS: A COMPARATIVE EXAFS STUDY OF a-Si1-xCx:H, a-SiNx:H AND a-Si1-xGex:H AT THE Si K-EDGE | 1987 | LNF_87_052.pdf | A. FILIPPONI, F. EVANGELISTI, A. BALERNA, S. MOBILIO | |
| 991 | 1987-00-00 | SPHERICAL WAVE ANALYSIS AND MULTIPLE SCATTERING EFFECTS IN HYDROGENATED AMORPHOUS SILICON | 1987 | LNF_87_053.pdf | A. BALERNA, M. BENFATTO, S. MOBILIO, C.R. NATOLI, A. FILIPPONI, F. EVANGELISTI | |
| 992 | 1987-00-00 | TWO-PHOTON ABSORPTION OF ALKALI HALIDES USING SYNCHROTRON RADIATION | 1987 | LNF_87_054.pdf | R. PIZZOFERRATO, M. CASALBONI, R. FRANCINI, U.M. GRASSANO, F. ANTONANGELI, M. PIACENTINI, N. ZEMA, F. BASSANI | |
| 993 | 1987-00-00 | SIZE EFFECT IN OPTICAL SPECTRA OF AMORPHOUS CARBON GRAINS | 1987 | LNF_87_055.pdf | V. CAPOZZI, L. COLANGELI, E. BUSSOLETTI, A. MINAFRA, A. BORGHESI, A. DEVITO | |
| 994 | 1987-00-00 | d-CORE TRANSITIONS IN ZnTe AND CdTe | 1987 | LNF_87_056.pdf | A. KISIEL, M. ZIMMAL-STARNAWSKA, F. ANTONANGELI, M. PIACENTINI, N. ZEMA | |
| 995 | 1987-00-00 | THE INFLUENCE OF Mn 3d ELECTRONS ON Cd1-xMnxTe FUNDAMENTAL REFLECTIVITY SPECTRA | 1987 | LNF_87_057.pdf | A. KISIEL, J. OLESZKIEWICZ, A. RODZIK, F. ANTONANGELI, M. PIACENTINI, N. ZEMA, A. BALZAROTTI, A. MYCIELSKI | |
| 996 | 1987-00-00 | OPTICAL PROPERTIES OF SCANDIUM THIN FILMS | 1987 | LNF_87_058.pdf | G. CHASSAING, J.C. FRANCOIS, M. SIGRIST, F. ANTONANGELI, N. ZEMA, M. PIACENTINI | |
| 997 | 1987-00-00 | CORE EXCITONS IN THE III-VI LAYRED SEMICONDUCTORS | 1987 | LNF_87_059.pdf | F. ANTONANGELI, N. ZEMA, M. PIACENTINI | |
| 998 | 1987-00-00 | RELAXATION OF HIGH ENERGY ELECTRONIC STATES IN POTASSIUM IODIDE | 1987 | LNF_87_060.pdf | F. ANTONANGELI, A. CHIARI, F. FERMI, U.M. GRASSANO, M. PIACENTINI, N. ZEMA | |
| 999 | 1987-00-00 | COLOUR CENTRES LIFETIME MEASUREMENTS USING SYNCHROTRON RADIATION AND PHASE FLUOROMETRY | 1987 | LNF_87_061.pdf | M. PIACENTINI, N. ZEMA, U.M. GRASSANO | |
| 1000 | 1987-00-00 | ALKALI HALIDES LUMINESCENCE EXCITED IN UV AND VUV REGION | 1987 | LNF_87_062.pdf | F. ANTONANGELI, M. PIACENTINI, N. ZEMA, U.M. GRASSANO, A. SCACCO, F. FERMI | |
| 1001 | 1987-00-00 | PHOTOEMISSION SPECTROSCOPY ON AMORPHOUS SEMICONDUCTORS AND THEIR INTERFACES | 1987 | LNF_87_063.pdf | F. EVANGELISTI, R. CIMINO, F. PATELLA, P. PERFETTI, C. QUARESIMA, M. CAPOZI | |
| 1002 | 1987-00-00 | FANO RESONANCE IN AMORPHOUS SILICON NITRIDE | 1987 | LNF_87_064.pdf | C. COLUZZA, P. PERFETTI, C. QUARESIMA, M. CAPOZI, G. FORTUNATO | |
| 1003 | 1987-00-00 | DOES DIPOLE INDUCE EFFECTS ON HETEROJUNCTIONS? | 1987 | LNF_87_065.pdf | C. QUARESIMA, P. PERFETTI, M. CAPOZI, C. COLUZZA | |
| 1004 | 1987-00-00 | INITIAL STAGES OF GaP(110) OXIDATION | 1987 | LNF_87_066.pdf | P. CHIARADIA, F. CICCACI, P. DE PADOVA, M. FANFONI, Z. HABIB, P. NATALETTI, S. SELCI | |
| 1005 | 1987-00-00 | TEMPERATURE-DEPENDENT ABSORPTION OF ORGANIC MOLECULES ON Si (III) 2x1 IN THE RANGE 140-300 K | 1987 | LNF_87_067.pdf | M.N. PIANCASTELLI, R. ZANONI, M.K. KELLY, D. KILDAY, G. MARGARITONDO, P. PERFETTI, C. QUARESIMA, M. CAPOZI | |
| 1006 | 1987-00-00 | EXPERIMENTAL STUDIES OF THE VALENCE AND CONDUCTION STATES OF THE TRANSITION METAL THIPHOSPHATES | 1987 | LNF_87_068.pdf | V. GRASSO, S. SANTANGELO, S. MODESTI, M. FANFONI, M. PIACENTINI | |
| 1007 | 1987-00-00 | XAS STUDIES ON THE ROLE OF THE ALKALINE ION IN A LEAD-GLAZE SYSTEM | 1987 | LNF_87_069.pdf | G. DALBA, P. FORNASINI, F. ROCCA, A. KRAJIEWSKI, A. RAVAGLIOLI, E. BURATTINI | |
| 931 | 1987-00-00 | SCINTILLATION GAS DETECTOR BASED ON CHARGE COUPLED DEVICE A Feasibility study of a position sensitive detector for ESRF hig brilliance X-ray source | 1987 | LNF_87_070(R).pdf | A. LA MONACA | |
| 932 | 1987-00-00 | NEW SCATTERING CAMERA FOR ANISOTROPIC ULTRA-LOW ANGLE SCATTERING EXPERIMENTS USING A THREE-DIMENSIONAL IMAGING GAS DETECTOR OPERATING WITH ESRF X-RAY SOURCES | 1987 | LNF_87_071(R).pdf | A. LA MONACA | |
| 920 | 1987-00-00 | SIGNAL TO NOISE RATIO IN SUPER-CONDUCTING TUNNEL JUNCTIONS AS IONIZING PARTICLE DETECTORS | 1987 | LNF_87_073(P).pdf | S. PACE, F. CELANI, A. SAGGESE, A. GIORGI | |
| 1009 | 1987-00-00 | MEASUREMENT OF THE REACTION e+e- Æ h p+ p- IN THE CENTER OF MASS ENERGY INTERVAL 1350-2400 MeV | 1987 | LNF_87_074.pdf | A, ANTONELLI, R. BALDINI, S. CALCATERRA, G. CAPON, M. SCHIOPPA, J.E. AUSGUSTIN, L. AYACH, G. COSME, F. COUCHOT, B. DUDELZAK, F. FULDA, G. GROSDIDIER, B. JEAN-MARIE, S. JULLIAN, D. LALANNE, V. LEPELTIER, F. MANE, C. PAULOT, R. RISKALLA, Ph. ROY, G. SZKLARZ, Z. AJALTOUNI, A. FALVARD, J. JOUSSET, B. MICHEL, J.C. MONTRET, D. BISELLO, G. BUSETTO, L. PESCARA, P. SARTORI, L. STANCO | |
| 1010 | 1987-00-00 | ROLE OF RADIATIVE CORRECTIONS FOR PRECISION TESTS OF THE STANDARD MODEL | 1987 | LNF_87_075(PT).pdf | M. GRECO | |
| 1011 | 1987-00-00 | ON-SHELL EQUIVALENCE OF LIGHT-LIKE INTEGRABILITY AND CANONICAL CONTRAINTS FOR D=10, N=1 SUPERGRAVITY | 1987 | LNF_87_076(PT).pdf | S. BELLUCCI | |
| 933 | 1987-00-00 | FORWARD AND BACKWARD ANGLE DIFFERENTIAL CROSS SECTION FOR 2H(g,p)n at 170 and 210 MeV sostituita da estratti | 1987 | LNF_87_077.pdf | P. LEVI-SANDRI, M. ANGHINOLFI, N. BIANCHI, G.P. CAPITANI, P. CORVISIERO, E. DE SANCTIS, G. GUARALDO, V. LUCHERINI, V. MUCCIFORA, E. POLLI, A.R. REOLON, G. RICCO, P. ROSSI, M. SANZONE, M. TAIUTI | |
| 1012 | 1987-00-00 | FRANGMENT MASS AND KINETIC ENERGY DISTRIBUTIONS FOR THE PHOTOFISSION OF 238U WITH 100-300 MeV BREMSSTRAHLUNG | 1987 | LNF_87_078(P).pdf | S. LO NIGRO, S. AIELLO, G. LANZANO', C. MILONE, A. PAGANO, A. PALMIERI, G. S. PAPPALARDO, V. LUCHERINI, N. BIANCHI, E. DE SANCTIS, C. GUARALDO, P. LEVI SANDRI, V. MUCCIFORA, E. POLLI, A. R. REOLON, P. ROSSI | |
| 1013 | 1987-00-00 | OPERATION OF LIMITED STREAMER TUBES WITH THE GAS MIXTURE Ar+CO2+ n-PENTANE | 1987 | LNF_87_079(P).pdf | C. BAGLIESI, R. BALDINI - CELIO, G. BATIGNANI, G. BENCIVENNI, G. F. BOLOGNA, F. BOSSI, U. BOTTIGLI, C. BRADASCHIA, P. CAMPANA, G. CAPON, M.G. CATANESI, V. CHIARELLA, G. DE NINNO, M. DE PALMA, B. D' ETTORE PIAZZOLI, M. DREUCCI, G. FELICI, L. FOA', A. GIASSI, G. IASELLI, P. LAURELLI, G. MAGGI, G. MANNOCCHI, G. P. MURTAS, G. NICOLETTI, S. NUZZO, P. PICCHI, A. RANIERI, G. RASO, H. RIGONI, F. ROMANO, F. RUGGIERI, S. SCAPELLATO, G. SELVAGGI, R. TENCHINI, G. ZITO | |
| 921 | 1987-00-00 | PLASTIC SPARK COUNTERS WITH PVC ELECTRODES | 1987 | LNF_87_080(P).pdf | G. BATTISTONI, P. CAMPANA, U. DENNI, G. GUSTAVINO, E. IAROCCI | |
| 1014 | 1987-00-00 | MULTIELECTRON TRANSITIONS ABOVE THE KRYPTON K EDGE | 1987 | LNF_87_081.pdf | E. BERNIERI, E. BURATTINI | |
| 1015 | 1987-00-00 | SUPERSTRING Higher Derivative MODIFICATIONS OF D=10 SUPERSPACE YANG-MILLS THEORIES | 1987 | LNF_87_082(PT).pdf | S. BELLUCCI | |
| 1016 | 1987-00-00 | INNER SHELL X-RAY PHOTOABSORPTION AS A STRUCTURAL AND ELECTRONIC PROBE OF MATTER | 1987 | LNF_87_083(PT).pdf | C.R. NATOLI | |
| 934 | 1987-00-00 | L'ACQUISIZIONE DEI DATI NELLE MISURE DI FLUSSO NEUTRONI NEL TUNNEL DEL GRAN SASSO | 1987 | LNF_87_084(NT).pdf | M. LINDOZZI, E. GUIDO | |
| 1017 | 1987-00-00 | UV-INDUCED REDUCTION OF Cu(II) IN DNA COMPLEX STUDIED BY Cu-K-EDGE XANES | 1987 | LNF_87_085.pdf | E. RONGONI, A. SCAFATI, M. MATZEU, M. BELLI, G. ONORI, A. REALE, A. BALERNA, A. BIANCONI, E. BERNIERI | |
| 1018 | 1987-00-00 | STUDY OF CONFINEMENT IN THE ADJOINT SU(2)-HIGGS MODEL BY MEANS OF THE FREDENHAGEN AND MARCU CRITERION | 1987 | LNF_87_086(PT).pdf | V. AZCOITI, A. CRUZ, G. DI CARLO, A.F. GRILLO, A. TARANCON | |
| 935 | 1987-00-00 | LA COMPUTERIZZAZIONE DEL CATALOGO DELLE NOTE INTERNE LNF | 1987 | LNF_87_087(NT).pdf | L. INVIDIA, M.A. SPANO-MELORIO | |
| 936 | 1987-00-00 | HIGH STATISTICS STUDY OF THE LOW ENERGY COSMIC MUONS ANGULAR DISTRIBUTION: RESULTS FROM MICRO | 1987 | LNF_87_088(P).pdf | G. BATTISTONI, C. BLOISE, A.F. GRILLO, A. MARINI, F. RONGA, V. VALENTE | |
| 1020 | 1987-00-00 | OPTICAL NETWORKS AND LABORATORY SERVICE | 1987 | LNF_87_090.pdf | O. CIAFFONI, M.L. FERRER, G. MIRABELLI, L. TRASATTI | |
| 1021 | 1987-00-00 | A DIFFRACTION RADIATION MODEL FOR ENERGY LOSSES | 1987 | LNF_87_092(P).pdf | L. PALUMBO | |
| 938 | 1987-00-00 | SUPERCONDUTTIVITA' E GIUNZIONI TUNNEL SUPERCONDUTTRICI COME RILEVATORI DI PARTICELLE IONIZZANTI | 1987 | LNF_87_093(NT).pdf | F. CELANI | |
| 922 | 1987-00-00 | BEHAVIOUR AND COMPARISON OF RF DEVICES Si JFET, DUAL GATE MOSFET AND GaAs MESFET AT 4.2, 77 AND 300 K FROM THE POINT OF VIEW OF NOISE AND GBW IN THE FREQUENCY RANGE 10 kHz-50 MHz | 1987 | LNF_87_094(P).pdf | F. CELANI, U. GAMBARDELLA, A. GIORGI, A. SAGGESE, S. CATA,' S. PACE | |
| 923 | 1987-00-00 | ON THE QUANTITATIVE JAHN-TELLER DISTORTION OF CU2+ SITE IN ACQUEOUS SOLUTION BY XANES SPECTROSCOPY | 1987 | LNF_87_095(PT).pdf | J. GARCIA, A. BIANCONI, M. BENFATTO, C. R. NATOLI | |
| 1022 | 1987-00-00 | PROPAGATORS AND RELAXATION FOR STOCHASTICALLY QUANTISED U(1) IN THE TEMPORAL GAUGE | 1987 | LNF_87_096(PT).pdf | M.L. LAVELLE, M. SCHADEN, A. VLADIKAS | |
| 940 | 1987-00-00 | A GUN FOR LISA | 1987 | LNF_87_098(R).pdf | S. KULINSKI, M. VESCOVI | |
| 1023 | 1987-00-00 | W+W- g GAMMA PRODUCTION IN e+e- ANNIHILATION IN THE TeV REGION | 1987 | LNF_87_099(PT).pdf | A. GRAU, M. GRECO, G. PANCHERI | |
| 941 | 1987-00-00 | STUDIO DI UN SISTEMA AUTOMATIZZATO PER LA DOSIMETRIA CITOGENETICA | 1987 | LNF_87_100(R).pdf | CARIOPEPR (PEPR, LNF, INFN, USL, ENEA) | |
| 1024 | 1987-00-00 | PHYSICS AT FUTURE COLLIDER | 1987 | LNF_87_101(PT).pdf | M. GRECO | |
| 942 | 1987-00-00 | SUPERCONDUTTIVITA' AD ALTA Tc-FABBRICAZIONE E CARATTERIZZAZIONE DI FILM DI YBa2Cu3Ox E PROBLEMATICHE PER LE APPLICAZIONI ALLE CAVITA' ACCELERANTI | 1987 | LNF_87_102(NT).pdf | L. MARITATO | |
| 1025 | 1987-00-00 | MONTECARLO SIMULATION OF THE ALEPH HADRON PROTOTYPE CALORIMETER | 1987 | LNF_87_103(P).pdf | R. ALBRIZIO, R. BALDINI FERROLI, G. BAGLIESI, G. BATIGNANI, G. BENCIVENNI, G. BOLOGNA, F. BOSSI, U. BOTTOGLI, C. BRADASCHIA, P. CAMPANA, G. CAPON, M. G. CATANESI, V. CHIARELLA, G. DE NINNO, M. DE PALMA, B. D'ETTORE PIAZZOLI, M. DREUCCI, G. FELICI, L. FOA', F. FORTI, A. GIASSI, M. A. GIORGI, G. IASELLI, P. LAURELLI, G. MAGGI, G. P. MANNOCCHI, A. MESSINEO, G. P. MURTAS, S. NATALI, S. NUZZO, P. PICCHI, A. RENIERI, G. RASO, F. ROMANO, F. RUGGERI, S. SCAPELLATO, G. SELVAGGI, L. SILVESTRIS, R. TRIGGIANI, G. ZITO | |
| 1026 | 1987-00-00 | ANTIPROTON-NUCLEUS INTERACTIONS AT LEAR | 1987 | LNF_87_104(P).pdf | C. GUARALDO | |
| 1027 | 1987-00-00 | ANALYSIS OF NUCLEON FORM FACTOR DATA REVEALS THE e+e- -- nn CROSS SECTION TO BE REMARKABLY LARGER THAN THE e+e- -- pp ONE (Pubblicato dall'autore dopo la ns. pubbl.) | 1987 | LNF_87_105(PT).pdf | S. DUBNICKA | |
| 1028 | 1987-00-00 | EXPERIMENTAL LIMITS ON CHARGE INDEPENDENCE AND SYMMETRY OF STRONG INTERACTIONS AT INERMEDIATE ENERGY | 1987 | LNF_87_106.pdf | L. SATTA | |
| 943 | 1987-00-00 | A UNIFIED SCHEME OF INTERPRETATION OF THE X-RAY ABSORPTION SPECTRA AS STRUCTURAL PROBE | 1987 | LNF_87_107.pdf | M. BENFATTO, C.R. NATOLI | |
| 944 | 1987-00-00 | THE ENERGY OF TWO COLOR CHARGES IN THE g-- • LIMIT OF QCD IN THE REPRESENTATION | 1987 | LNF_87_108.pdf | F. PALUMBO | |
| 945 | 1987-00-00 | EXAFS IN AMORPHOUS SILICON ALLOYS | 1987 | LNF_87_109.pdf | S. MOBILIO, A. FILIPPONI | |
| 1029 | 1987-00-00 | OPTICAL CAVITY ALIGNMENT AND MIRROR DAMAGE IN THE LELA FEL EXPERIMENT | 1987 | LNF_87_110.pdf | P. PATTERI, M.A. PREGER, M. AMBROSIO, G. BARBARINO, M. CASTELLANO, N. CAVALLO, F. CEVENINI, R. MASULLO | |
| 1030 | 1987-00-00 | DESIGN STUDY FOR THE TRIESTE SYNCHROTRON LIGHT SOURCE | 1987 | LNF_87_111.pdf | The Adone Group presented by S. TAZZARI | |
| 1031 | 1987-00-00 | MEASUREMENT AND CORRECTION OF THE CLOSED ORBIT IN THE STORAGE RING ADONE | 1987 | LNF_87_112.pdf | A. ARAGONA, C. BISCARI, S. DE SIMONE, E. GIANFELICE, S. GUIDUCCI, V. LOLLO, S. PELLA, M. PREGER, M. SERIO | |
| 1032 | 1987-00-00 | LATTICE STUDIES FOR THE TRIESTE SYNCHROTRON RADIATION MACHINE | 1987 | LNF_87_113.pdf | M. E. BIAGINI, C. BISCARI, E. GIANFELICE, S. GUIDUCCI, L. PALUMBO, M. PREGER | |
| 4554 | 1986-12-19 | Installation and Use of Tex at INFN-CNAF | 1986 | INFN-TC_86-21.pdf | L. Fonti, M.L. Luvisetto, E. Ugolini, E. Remiddi, F. Semeria | |
| 4553 | 1986-12-15 | L’Immagine Radiografica (Telex) | 1986 | INFN-TC_86-20.pdf | R. Giacomin, L. Babarini | |
| 1061 | 1986-12-02 | Misure di Radioattivita' nei Campioni di Materiali da Utilizzare per le Strutture Interne del LINGS dell'INFN | 1986 | LNF-86-060(R).pdf | A. Esposito | Uno dei requisiti fondamentali del Laboratorio costruito sotto al Gran Sasso d'Italia i quello di avere al suo interno un fondo di radiazioni che sia il più modesto possibile, in considerazione del tipo di ricerche da svolgetvi. Le componenti più importanti di tale fondo sono i raggi cosmici, contributo sicuramente modesto tenuto conto dell' attenuazione introdotta dallo spessore di roccia (1400 m) sovrastante il laboratorio (Fig. 1), il 40K e le famiglie radioattive del 232Th e del 238U presenti nei materiali da costruzione e nelle rocce. E' possibile anche la presenza 60Co di radionuclidi artifIciali (per esempio il Co nei manufatti di ferro etc.). In precedenti note (l,2,3), è stata studiata la concentrazione di radionuclidi naturali nelle rocce e nei materIali da costruzione usati per il Laboratorio Nazionale Gran Sasso. Nella presente nota vengono studiati campioni di tutti i materiali che saranno o potranno essere utilIzzati per il completamento dei Laboratorio stesso (pareti per l' isolamento termico e idraulico, rivestimenti, piastrelle per pavimenti etc.). |
| 4529 | 1986-11-28 | Measurements of D-Meson Lifetimes in NA27 | 1986 | INFN-AE_86-12.pdf | C. Caso | |
| 4551 | 1986-11-28 | Progetto e Realizzazione di una Macchina Tendifili per Produzione Industriale di Tubi Streamer | 1986 | INFN-TC_86-18.pdf | P.F. Ceglie, R. Lizzi, M. Mongelli, M. Perchiazzi, A. Sacchetti | |
| 4552 | 1986-11-28 | Sistema Hardware/Software per Stazione di Saldatura di Tubi Streamer per End-Caps del Calorimetro Adronico Impiegato nell’Esperimento ALEPH | 1986 | INFN-TC_86-19.pdf | R. Ferrorelli, R. Liuzzi | |
| 4550 | 1986-11-27 | Results of a Test on the SGS Digital Strip Readout Electronics for Limited Streamer Tubes | 1986 | INFN-TC_86-17.pdf | F. Beconcini, G.M. Bilei, R. Castaldi, U. Cazzola, R. Dell’Orso, P.G. Verdini | |
| 4528 | 1986-11-22 | Muon Flux Measurement in the Gran Sasso Laboratory | 1986 | INFN-AE_86-11.pdf | R. Cardarelli, S. D’Angelo, L. Paoluzzi, R. Santonico, R. Bernabei, F. Sebastiani | |
| 4534 | 1986-10-16 | Study on Hg I2 Nuclear Detector | 1986 | INFN-FM_86-1.pdf | C. Manfredotti, A. Gabutti, G. Cervino, E. Monticone, U. Nastasi | |
| 4549 | 1986-10-01 | Un Metodo ad Interferometria Olografica per la Misura della Freccia di un Elettrodo Sottile in una Camera a Piatti Paralleli (PPC) | 1986 | INFN-TC_86-15.pdf | R. Bellazzini, A. Breg, M.M. Massai, M.R. Torquati | |
| 4548 | 1986-07-30 | L’Uso di Scintillatori Csl (Ti) Leti da Fotodiodi come Rivelatori di Particelle Cariche e Ioni Pesanti ad Energie Intermedie | 1986 | INFN-TC_86-14.pdf | G. Viesti, G. Segato, G. Prete, B. Fornai, F. Gramegna, Lou Yunian, D. Fabris, G. Nebbia, K. Hagel, A. Menchara-Rocha | |
| 4546 | 1986-07-23 | The Trim Coils Power Supplies for the Milan Superconducting Cyclotron | 1986 | INFN-TC_86-12.pdf | G. Baccaglini, G. Cavalieri | |
| 4547 | 1986-07-23 | An Intelligent vme-CAMAC Interface CBA | 1986 | INFN-TC_86-13.pdf | I. D’Antone, G. Mandrioli, L. Marradi, G. Sanzani | |
| 4527 | 1986-07-22 | Neutrino-Electron Scattering: Prospects with the Charm II Detector | 1986 | INFN-AE_86-10.pdf | V. Palladino | |
| 4526 | 1986-07-21 | Possible Cosmological Consequences of Thermodynamics in a Unified Approach to Gravitational and Strong Interactions | 1986 | INFN-AE_86-9.pdf | E. Recami, V. Tonin Zachin, J.M. Martìnez | |
| 4533 | 1986-07-18 | Controllo Alimentazioni HV Wenzel 16 Canali con uP Single Chip | 1986 | INFN-BE_86-4.pdf | A. Dal Bello | |
| 4545 | 1986-07-15 | T.E. Modes in Waveguides with Parallelogram Cross Section | 1986 | INFN-TC_86-11.pdf | A. Massarotti, D. Chiocca | |
| 4532 | 1986-07-01 | Annual Report 85 | 1986 | INFN-BE_86-3.pdf | ||
| 4525 | 1986-06-27 | Possible Consequences for Neutrino-Oscillations of a Tachyonic Muon-Neutrino | 1986 | INFN-AE_86-8.pdf | E. Giannetto, G.D. Maccarrone, R. Mignani, E. Recami | |
| 4544 | 1986-06-23 | DELPHI. A Gamma Spectrum Analysis Code. Program’s Structure and User’s Guide | 1986 | INFN-TC_86-10.pdf | G. Bellia | |
| 4524 | 1986-05-22 | Conceptual Design of the E.H.F. | 1986 | INFN-AE_86-7.pdf | F. Bradamante | |
| 5648 | 1986-05-21 | CONCEPTUAL DESIGN OF THE EHF. | 1986 | INFN-AE-86-7.pdf | F. Bradamante. | A preliminary conceptual design for the European Hadron Facility (EHF), a high current proton synchrotron in the 30 - 40 GeV energy range to be built in Western Europe, has been worked out and the present report gives a short description of the various accelerators involved and of the criteria adopted. The work has been stimulated by the EHF Study Group and has been carried through by an international team made up of the accelerator physicists from Europe and from oversea listed in Table 1. The activities of the group have been sponsored in so far by Germany, Italy and Switzerland, and have had as milestones three dedicated workshops, in Trieste (Oct. 9 - Oct. 16, 1985), at SIN (Dec. 9 - Dec. 11, 1985), and in Karlsruhe (March 3 - March 5, 1986). The terms of reference for the EHF as given by the Study Group asked for an accelerator complex to accelerate a 100 μ Amp proton beam ( .6x10<sup>15</sup> protons/sec) to an energy of 30 Gev. Further constraints regarded i) the capability to produce polarized proton beams; ii) the presence of both fast and slow extraction systems (duty factors 10<sup>-4</sup> and 1 respectively) to produce neutrino beams and a spectrum of intense, high quality μ, π, k and <span style='text-decoration: overline'>p</span> beams; iii) easy upgrade of the designed maximum energy to ~40 GeV. No existing injector was suggested, since no existing site or laboratory was to be assumed for the moment, and in this sense the project which is described in this report has been usually referred to as the 'siteless EHF'<sup>1</sup>). Being a European project clearly a Swiss option using the 590 MeV SIN isochronous cyclotron as injector has been kept in mind from the very beginning (option A in ref. 1) and is still being investigated by the SIN staff<sup>2</sup>), but has not been studied by the group in Table 1 and I will not report about it. The possibility of building the EHF in the framework of CERN suggested a further constraint, i. e. iv) 960 m for the length of the 30 GeV proton-synchrotron so that eventually it could fit into the ISR tunnel. Actually, given the energy of the machine, this last requirement turned out to be no constraint at all. |
| 4543 | 1986-05-12 | 16 Discriminator and 16 Strobed Coincidence ECL | 1986 | INFN-TC_86-9.pdf | G. Pitacco | |
| 4542 | 1986-04-30 | High Energy Physics Event Processing on a Vector Computer: a Case Study | 1986 | INFN-TC_86-8.pdf | M. Basile, M.L. Luvisetto, E. Ugolini | |
| 4541 | 1986-04-29 | Realization of an Automatic Set-up to Measure Electrical Characteristic of Solid State Detectors | 1986 | INFN-TC_86-7.pdf | G. Manfredotti, D. Crosetto, A. Gabutti, G. Gervino, R. Varesio | |
| 4523 | 1986-04-22 | A Satisfactory Formalism for Magnetic Monopoles by Clifford Algebras | 1986 | INFN-AE_86-6.pdf | M.A. de Faria-Rosa, E. Recami, W.A. Rodrigues Jr. | |
| 5647 | 1986-04-02 | SPACE RESOLUTION OF THE TPC | 1986 | INFN-AE-86-5.pdf | L. Rolandi. | The principle of coordinate measurement of the Time Projection Chamber is discussed together with the various factors that influence the measuring accuracy in the sagitta direction. Some experimental results on the spatial resolution with different cathode geometry are presented and are compared with the theory. |
| 4531 | 1986-03-07 | Gamma Decay of Excited Complex Fragments Emitted in the Reaction 20Ni + 60Ni at 742 MeV | 1986 | INFN-BE_86-2.pdf | A. D’Onofrio, B. Delaunay, J. Delaunay, H. Dumont, J. Gomez del Campo, A. Brondi, R. Moro, M. Romano, F. Terasi, J.F. Bruandet | |
| 4521 | 1986-03-03 | A Classical Model of Kaluza-Klein Theories with Torsion | 1986 | INFN-AE_86-3.pdf | A. Pasini | |
| 4540 | 1986-02-28 | Control Electronics for High Power Operation of the Milan Superconducting Cyclotron RF Cavities | 1986 | INFN-TC_86-6.pdf | A. Bosotti, W. Lovati, C. Pagani | |
| 1046 | 1986-02-27 | Ulteriori Misure di Radioattivita' Naturale per il Laboratorio del Gran Sasso dell'INFN | 1986 | LNF-86-013(R).pdf | A. Esposito, M. Pelliccioni e G. Sciocchetti | Com'è noto, tra i requisiti fondamentali del Laboratorio del Gran Sasso, in corso di realizzazione lungo il tunnel autostradale della Roma-L'Aquila, vi è quello di mantenere al suo interno un fondo di radiazioni quanto più basso possibile. In precedenti note(1,,2) sono stalte esaminate le due più imp~rtanti componenti del predetto fondo di radiazioni, le rocce circostanti e i materiali da costruzione, tra cui in primo luogo il calcestruzzo da usare per il rivestimento delle pareti del Laboratorio. In entrambi i casi principali contributi alla radioattività totale sono risultati quellii dovuti al K-40 e ai rad'ionucliidi delle famiglie radioattive dell'U-238 e del Th-232. Nelle stesse note sono stati anche riportati i risultati di misure di esposizione effettuate in vari punti della galleria autostradale. Recentemente sono state eseguite ulteriori misure di radioattività in vari campioni di cemento, estendendo cos' le precedenti indagini. con lo scopo questa volta di selezionare quello più adatto per realizzare la sorgente da utilizzare per lo studio del decadimento del protone. Sono state inoltre effettuate nuove misure dei livelli di esposizione nel costruendo laboratorio e per la prima volta anche misure di concentrazione di radon in aria. I risultati di tutte queste misure sono qui di seguito riportati. |
| 4539 | 1986-02-25 | A CP/M VMEBUS Control System | 1986 | INFN-TC_86-5.pdf | R. Birsa, P. Ciliberti | |
| 4538 | 1986-02-21 | Construction and Assembling of the Trim Coils for the Milan Superconducting Cyclotron | 1986 | INFN-TC_86-4.pdf | G. Baccaglioni, G.C. Cartegni, M. Fusetti, L. Gini | |
| 4537 | 1986-02-18 | Integrali di Feynman in Fisica Teorica, Fisica Nucleare e Meccanica Statistica | 1986 | INFN-TC_86-3.pdf | R. Cenni, E. Galleani, F. Napoli, G. Olivieri, P. Saracco, M. Sassetti | |
| 4519 | 1986-02-07 | Are Muon Neutrinos Faster-than-light Particles? (Comments on a recent paper by Chodos et al.) | 1986 | INFN-AE_86-1.pdf | E. Recami, R. Mignani, G.D. Maccarrone | |
| 4520 | 1986-02-07 | Does Thermodynamics Require a New Expansion after the “Big Crunch” of Our Cosmos | 1986 | INFN-AE_86-2.pdf | E. Recami, V. Tonin-Zanchin | |
| 4530 | 1986-02-05 | Preliminary Results on “Hagar” - a High Energy Anticoincidence Gamma Ray Spectrometer | 1986 | INFN-BE_86-1.pdf | A. Zucchiatti | |
| 4536 | 1986-01-28 | Ciclotroni Commerciali in Biomedicina: Rassegna dei Modelli Attualmente Disponibili | 1986 | INFN-TC_86-2.pdf | C. Birattari, M. Bonardi, A. Ferrari, L. Milanesi, M. Silari | |
| 4535 | 1986-01-27 | Polarized Hydrogen Beam Target | 1986 | INFN-TC_86-1.pdf | F. Levrero, R. Parodi, S. Terreni | |
| 1040 | 1986-00-00 | MEASURING VERY LOW NEUTRON FLUX UNDERGROUND - Some statistics reminders and practical considerations | 1986 | LNF_86_001(R).pdf | A. RINDI, F. CELANI | |
| 1062 | 1986-00-00 | UNDERSTANDING THE YANG MILLS GROUND STATE: THE ORIGIN OF COLOUR CONFINEMENT | 1986 | LNF_86_002(P).pdf | G. PREPARATA | |
| 1063 | 1986-00-00 | TITOLO LNF : DEUTERON PHOTODISINTEGRATION TOTAL CROSS SECTION BETWEEN 15 AND 75 MeV.TITOLO RIVISTA PHYS.REV.: TOTAL CROSS SECTION FOR DEUTERON PHOTODISINTEGRATION BETWEEN 15 AND 75 MeV. | 1986 | LNF_86_003(P).pdf | R. BERNABEI, A. INCICCHITTI, M. MATTIOLI, P. PICOZZA, D. PROSPERI, L. CASANO, S. D'ANGELO, M.P. DE PASCALE, C. SCHAERF, G. GIORDANO, G. MATONE, S. FRULLANI, B. GIROLAMI | |
| 1064 | 1986-00-00 | A HIGH VOLTAGE NETWORK FOR STREAMER TUBES | 1986 | LNF_86_004(P).pdf | G. BATTISTONI, G. BENCIVENNI, P. CAMPANA, B. D'ETTORRE-PIAZZOLI, P. LAURELLI, G. MANNOCCHI, P. PICCHI | |
| 1065 | 1986-00-00 | MONOCHROMATIC AND POLARIZED TAGGED LADON GAMMA RAY BEAMS | 1986 | LNF_86_005(P).pdf | M. PREGER, B. SPATARO, R. BERNABEI, M.P. DE PASCALE, C. SCHAERF | |
| 1066 | 1986-00-00 | COHERENT DAMPING OF EXCITATIONS IN NUCLEAR COLLISIONS FROM THE ENERGY WEIGHTED INELASTIC SUM RULE | 1986 | LNF_86_006.pdf | A. MALECKI, L. SATTA | |
| 1041 | 1986-00-00 | ALEPH BARREL MUONS DETECTOR TECHNICS DESCRIPTION | 1986 | LNF_86_007(NT).pdf | B. DULACH, G. SENSOLINI | |
| 1042 | 1986-00-00 | REALIZZAZIONE DI UNA MACCHINA PER BLOCCARE A CALDO I FILI ANODICI DI TUBI PLASTICI A STREAMER LIMITATO | 1986 | LNF_86_008(NT).pdf | G. CATIDDI, G. CORRADI, A. DI VIRGILIO, L. IANNOTTI, G. NICOLETTI, G. SABATINI, M. SANTONI, A. TIBURZI, S. VALERI | |
| 1043 | 1986-00-00 | MISURATORE INDIRETTO DELLA TENSIONE MECCANICA DI FILI CONDUTTORI | 1986 | LNF_86_009(NT).pdf | G. CORRADI | |
| 1044 | 1986-00-00 | UNA ATTREZZATURA AUTOMATICA PER LA COSTRUZIONE DI TUBI A STREAMER | 1986 | LNF_86_010(NT).pdf | M. ANELLI, R. BONINI, G. CATIDDI, V. CHIARELLA, G. CORRADI, U. DENNI, A. DI VIRGILIO, L. IANNOTTI, P. LAURELLI, G. NICOLETTI, D. PISTONI, G. SABBATINI, M. SANTONI, A. TIBURZI, S. VALERI | |
| 1045 | 1986-00-00 | REALIZZAZIONE DI CIRCUITI STAMPATI CON COMPUTER | 1986 | LNF_86_011(NT).pdf | S. DE SIMONE | |
| 1067 | 1986-00-00 | A NEW DEFINITION OF THE DIFFRACTIVE LIMIT WITH APPLICATIONS TO pp AND pp- SCATTERING | 1986 | LNF_86_012(P).pdf | E. ETIM, A. MALECKI, L. SATTA | |
| 1068 | 1986-00-00 | CENTAUROS FROM GYCNUS X-3 | 1986 | LNF_86_014(P).pdf | A.F. GRILLO, A. SEGUI' | |
| 1047 | 1986-00-00 | THREE PARTICLE CORRELATION FUNCTION OF METAL IONS IN TETRAHEDRAL COORDINATION DETERMINED BY XANES | 1986 | LNF_86_015.pdf | M. BENFATTO, C.R. NATOLI, A. BIANCONI, J. GARCIA, A. MARCELLI, I. DAVOLI | |
| 1048 | 1986-00-00 | NEW MEASUREMENTS OF NEUTRON FLUX IN THE GRAN SASSO | 1986 | LNF_86_016(R).pdf | A. RINDI, F. CELANI, F. CARDONE, S. MIOZZI, M. LINDOZZI, A. PECCHI | |
| 1069 | 1986-00-00 | TAUBERIAN THEOREMS FOR THE BOREL SUMMABILITY AND ANALYTIC CONTINUATION OF THE ASYMPTOTICS OF QCD SUM RULES | 1986 | LNF_86_017(P).pdf | E. ETIM | |
| 1070 | 1986-00-00 | BHABHA SCATTERING NEAR THE Zo | 1986 | LNF_86_018(P).pdf | M. GRECO | |
| 1049 | 1986-00-00 | UNIFICAZIONE DELLE FORZE FONDAMENTALI | 1986 | LNF_86_020(R).pdf | B. BARBIELLINI, G. BARBIELLINI | |
| 1072 | 1986-00-00 | QCD AND THE DYNAMICS OF CONFINEMENT: A PROBLEM THAT IS BEING SOLVED | 1986 | LNF_86_021(P).pdf | G. PREPARATA | |
| 1050 | 1986-00-00 | RAPPORTO ATTIVITA' 1985 | 1986 | LNF_86_022(R).pdf | Curato dal Servizio Documentazione | |
| 1051 | 1986-00-00 | GAS BREMSSTRAHLUNG PRODUCTION IN THE ADONE STORAGE RING | 1986 | LNF_86_023(NT).pdf | A. ESPOSITO | |
| 1073 | 1986-00-00 | ADONE WIGGLER BEAM LINES PROGRESS REPORT | 1986 | LNF_86_024.pdf | E. BURATTINI, A. BALERNA, E. BERNIERI, C. MENCUCCINI, R. RINZIVILLO, G. D'ALBA, P. FORNASINI | |
| 1052 | 1986-00-00 | EXAFS IN A DISPERSIVE MODE. I: Theory and Performance of Cylindrically Bent Crystal | 1986 | LNF_86_025(NT).pdf | A. BALERNA, S. MOBILIO, A. MERLINI | |
| 1074 | 1986-00-00 | INFLUENCE OF MAGNETIC FIELDS ON THE RESPONSE OF ACRYLIC SCINTILLATORS | 1986 | LNF_86_026(P).pdf | S. BERTOLUCCI, M. CORDELLI, M. CURATOLO, B. ESPOSITO, P. GIROMINI, S. MISCETTI, A. SANSONI | |
| 1075 | 1986-00-00 | EVOLUTION OF STRUCTURE FUNCTIONS AND UPWARD NEUTRINO INDUCED MUON SIGNAL IN UNDERGROUND EXPERIMENTS | 1986 | LNF_86_027(P).pdf | T.K. GAISSER, A.F. GRILLO | |
| 1076 | 1986-00-00 | THE VACUUM POLARIZATION EQUATION OF STATE IN QUANTUM ELECTRODYNAMICS | 1986 | LNF_86_028(P).pdf | Y.N. SRIVASTAVA, A. WIDOM, XUENING WU | |
| 1053 | 1986-00-00 | PROPOSTA DI REALIZZAZIONE DI UN FASCIO DI FOTONI "MARCATI", PRODOTTI DALLA BREMSSTRAHLUNG DEGLI ELETTRONI DI ADONE SU UNA JET TARGET | 1986 | LNF_86_029(R).pdf | M. ALBICOCCO, M. ANGHINOLFI, N. BIANCHI, G.P. CAPITANI, P. CORVISIERO, E. DE SANCTIS, E. DURANTE, C. GUARALDO, V. LUCHERINI, P. LEVI-SANDRI, L. MATTERA, V. MUCCIFORA, E. POLLI, A.R. REOLON, G. RICCO, M. SANZONE, M. TAIUTI, U. VALBUSA, A. VITICCHIE', A. ZUCCHIATTI, M. CASTOLDI, A. ORLANDI, W. PESCI, V. PUCCI, A. ROTTURA, A. MACIOCE, A. ARAGONA, V. CHIMENTI, A. ESPOSITO, V. LOLLO, E. MARTUSCELLI, M. PELLICCIONI, M. PREGER, F. TAZZIOLI, M. VESCOVI | |
| 1077 | 1986-00-00 | REALIZZAZIONE DI UN FASCIO DI FOTONI "ETICHETTATI" | 1986 | LNF_86_030(R).pdf | V. MUCCIFORA, E. DE SANCTIS | |
| 1078 | 1986-00-00 | QCD JETS: A PERTURBATIVE APPROACH LOW pt-PHYSICS | 1986 | LNF_86_031(P).pdf | G. PANCHERI, Y.N. SRIVASTAVA | |
| 1079 | 1986-00-00 | THE SCISSORS MODE | 1986 | LNF_86_032(P).pdf | F. PALUMBO | |
| 1033 | 1986-00-00 | TOROIDAL COIL CONFIGURATIONS FOR A LARGE ACCEPTANCE SPACE SPECTROMETER | 1986 | LNF_86_033(P).pdf | G. BARTALUCCI, G. BASINI, F. BONGIORNO, A. CODINO, M. RICCI, P. SPILLANTINI | |
| 1034 | 1986-00-00 | ANTIPROTON ANNIHILATION ON Ag/Br NUCLEI | 1986 | LNF_86_034.pdf | YU. A. BATUSOV, S. A. BUNYATOV, I. V. FALOMKIN, G. B. PONTECORVO, M. G. SAPOZHNIKOV, F. BALESTRA, S. BOSSOLASCO, M. P. BUSSA, L. BUSSO, L. FERRERO, D. PANZIERI, G. PIRAGINO, F. TOSELLO, C. GUARALDO, A. MAGGIORA, G. BENDISCIOLI, V. FILIPPINI, A. ROTONDI, A. ZENONI, E. LODI - RIZZINI | |
| 1080 | 1986-00-00 | NEW HIGH-ENERGY APPROXIMATION FOR X-RAY-ABSORPTION NEAR EDGE STRUCTURE | 1986 | LNF_86_035.pdf | J.J. REHR, R.C. ALBERS, C.R. NATOLI, E.A. STERN | |
| 1081 | 1986-00-00 | A UNIFYING SCHEME OF INTERPRETATION OF X-RAY ABSORPTION SPECTRA BASED ON THE MULTIPLE SCATTERING THEORY | 1986 | LNF_86_036(P).pdf | C.R. NATOLI, M. BENFATTO | |
| 1082 | 1986-00-00 | LIFETIME MEASUREMENTS IN e+ e- ANNIHILATION | 1986 | LNF_86_037(P).pdf | I. PERUZZI | |
| 1083 | 1986-00-00 | SMALL ANGLE X-RAY SCATTERING EXPERIMENTS WITH THREE-DIMENSIONAL IMAGING GAS DETECTORS | 1986 | LNF_86_038.pdf | A. LA MONACA, M. IANNUZZI, R. MESSI | |
| 1084 | 1986-00-00 | CHARACTERIZATION OF METAL SITES IN NUCLEIC ACIDS BY HIGH-RESOLUTION X-RAY SPECTROSCOPY | 1986 | LNF_86_039.pdf | M. BELLI, A. BALERNA, E. BERNIERI, A. BIANCONI, E. BURATTINI, M. MATZEU, F. MAZZEI, S. MOBILIO, C.R. NATOLI, G. ONORI, L. PALLADINO, A. REALE, E. RONGONI, A. SCAFATI | |
| 1085 | 1986-00-00 | NEW TRENDS IN RADIATION PROTECTION DOSIMETRY | 1986 | LNF_86_040.pdf | M. PELLICCIONI | |
| 1035 | 1986-00-00 | EAS WITH PLASTIC STREAMER TUBES AND OTHER GAS DETECTORS | 1986 | LNF_86_041(P).pdf | G. BATTISTONI, C. GUSTAVINO, F. RONGA, S. TORRES | |
| 1054 | 1986-00-00 | PROVVEDIMENTI DI RADIOPROTEZIONE PER IL CANALE BX1 DEL LABORATORIO PWA | 1986 | LNF_86_042(R).pdf | M. ESPOSITO, M. PELLICCIONI | |
| 1036 | 1986-00-00 | A STUDY OF SHORT-RANGE CORRELATION EFFECTS ON NUCLEAR SPATIAL AND MOMENTUM DISTRIBUTION | 1986 | LNF_86_043(P).pdf | A. N. ANTONOV, P. E. HODGSON, A. MALECKI, I. ZH. PETKOV | |
| 1086 | 1986-00-00 | STOCHASTIC QUANTISATION AND KILLING SYMMETRIES OF RANDOM SYSTEMS | 1986 | LNF_86_044(P).pdf | E. ETIM, L. SCHULKE | |
| 1087 | 1986-00-00 | ANALYTICITY CONSTRAINTS AND ABSENCE OF MULTIPLE DIPS IN ELASTIC pp AND pp- SCATTERING | 1986 | LNF_86_045(P).pdf | E. ETIM, A. MALECKI | |
| 1055 | 1986-00-00 | VOLTAGE INDUCED VARIATIONS OF THE TUNNEL BARRIER IN Nb/Pb JUNCTIONS | 1986 | LNF_86_046(P).pdf | F. CELANI, A. SAGGESE, S. PACE, G. RUBINO | |
| 1056 | 1986-00-00 | MAGNETE ICARUS: Descrizione tecnica della soluzione con settori laminati | 1986 | LNF_86_047(NT).pdf | B. DULACH, F. STRAFFI | |
| 1088 | 1986-00-00 | EXPERIMENTAL STATUS OF WEAK INTERACTIONS | 1986 | LNF_86_048.pdf | G. BARBIELLINI, C. SANTONI | |
| 1057 | 1986-00-00 | FROM LIGHT MODULATION TO COMPLETE MODE-LOCKING IN AN ARGON-ION LASER | 1986 | LNF_86_049(P).pdf | G. GIORDANO, G. MATONE | |
| 1089 | 1986-00-00 | RADIATION INDUCED TOXIC GAS | 1986 | LNF_86_050(P).pdf | P. BIANCO, A. ESPOSITO, M. PELLICCIONI | |
| 1058 | 1986-00-00 | HIGH-ENERGY NEUTRINO EMISSION FROM BINARY X-RAY SOURCES | 1986 | LNF_86_051.pdf | G. AURIEMMA, H. BILOKON, A.F. GRILLO | |
| 1090 | 1986-00-00 | ELECTROWEAK SIGNALS IN CIRCUITS | 1986 | LNF_86_052.pdf | Y.N. SRIVASTAVA, A. WIDOM | |
| 1092 | 1986-00-00 | FORWARD AND BACKWARD DEUTERON PHOTODISINTEGRATION CROSS SECTION AND A TAGGED PHOTON BEAM FROM BREMSSTRAHLUNG ON AN ARGON JET TARGET | 1986 | LNF_86_054(P).pdf | E. DE SANCTIS, M. ANGHINOLFI, A. BERTOCCHI, N. BIANCHI, G.P. CAPITANI, P. CORVISIERO, C. GUARALDO, P. LEVI-SANDRI, V. LUCHERINI, L. MATERA, V. MUCCIFORA, E. POLLI, A.R. REOLON, G. RICCO, P. ROSSI, M. SANZONE, M. TAIUTI, G. URCIOLI, U. VALBUSA, A. ZUCCHIATTI | |
| 1059 | 1986-00-00 | RADIATIVE CORRELATIONS TO e+ e- REACTIONS AT LEP/SLC ENERGIES | 1986 | LNF_86_055(P).pdf | M. GRECO | |
| 1093 | 1986-00-00 | MUON TRACKING UNDERGROUND | 1986 | LNF_86_057.pdf | G. BATTISTONI, P. CAMPANA, V. CHIARELLA, U. DENNI, E. IAROCCI, G. MAZZENGA, F. RONGA | |
| 1094 | 1986-00-00 | MEASUREMENTS OF NEUTRINO OSCILLATIONS IN REALISTIC UNDERGROUND EXPERIMENTS | 1986 | LNF_86_058.pdf | A. GRILLO, V. VALENTE | |
| 1037 | 1986-00-00 | LIMIT ON MONOPOLE FLUX IN THE MONT BLANC NUSEX EXPERIMENT | 1986 | LNF_86_059.pdf | G. BATTISTONI, C. BLOISE, P. CAMPANA, A. CIOCIO, E. IAROCCI, V. CHIARELLA, G. P. MURTAS, G. NICOLETTI, L. SATTA, G. BOLOGNA, C. CASTAGNOLI, A. CASTELLINA, B. D' ETTORRE PIAZZOLI, P. GALEOTTI, G. MANNOCCHI, P. PICCHI, P. SAAVEDRA, S. VERNETTO, E. BELLOTTI, E. FIORINI, C. LIGUORI, P. NEGRI, A. PULLIA, S. RAGAZZI, M. ROLLIER, L. ZANOTTI | |
| 1095 | 1986-00-00 | LOW-pt JETS AND THE RISE WITH ENERGY OF THE INELASTIC CROSS SECTION | 1986 | LNF_86_061.pdf | G. PANCHERI, Y. N. SRIVASTAVA | |
| 1097 | 1986-00-00 | PERFORMANCE OF A LIMITED STREAMER TUBE HADRON CALORIMETER | 1986 | LNF_86_063.pdf | M.G. CATANESI ... R. BALDINI, G. BATTISTONI, C. BENCIVENNI, G. BOLOGNA, P. CAMPANA, G. CAPON, F. CELANI, V. CHIARELLA, A. CIOCIO, B. D'ETTORRE PIAZZOLI, G. FELICI, P. LAURELLI, G.P. MANNOCCHI, G.P. MURTAS, G. NICOLETTI, M. PALLOTTA, P. PICCHI ... | |
| 1098 | 1986-00-00 | PROGRESS REPORT ON THE LELA EXPERIMENT | 1986 | LNF_86_064.pdf | M. AMBROSIO ... P. PATTERI M. PREGER ... | |
| 1099 | 1986-00-00 | DYNAMIC PROPERTIES AND DEBYE TEMPERATURES OF BULK Au AND Au CLUSTERS STUDIED USING EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE SPECTROSCOPY | 1986 | LNF_86_065.pdf | A. BALERNA, S. MOBILIO | |
| 1100 | 1986-00-00 | POSITION SENSITIVE SILICON DETECTORS INSIDE THE TEVATRON COLLIDER | 1986 | LNF_86_066.pdf | G. APOLLINARI, ....S.BARTOLUCCI M.CORDELLI M.CURATOLO B.DULACH B.ESPOSITO P.GIROMINI S.MISCETTI A.SANSONI ........ | |
| 1101 | 1986-00-00 | CONSTRUCTION AND PERFORMANCE OF SILICON DETECTORS FOR THE SMALL ANGLE SPECTROMETERS OF THE COLLIDER DETECTOR OF FERMILAB | 1986 | LNF_86_067.pdf | G. APOLLINARI ... S. BARTOLUCCI M. CORDELLI M. CURATOLO B. DULACH B. ESPOSITO P. GIROMINI S. MISCETTI A. SANSONI | |
| 1038 | 1986-00-00 | SEARCH FOR ANTIMATTER IN COSMIC RADIATION. A MATTER-ANTIMATTER SPACE SPECTROMETER | 1986 | LNF_86_068.pdf | G. BASINI, F. BONGIORNO, M. RICCI, P. SPILLANTINI, S. BARTALUCCI, A. CAPONE, D. DE PEDIS, A. CODINO, G. AURIEMMA, E. LAMANNA, S. PETRERA, A. SCIUBBA | |
| 1102 | 1986-00-00 | OPTICAL CAVITY OF THE ADONE FEL EXPERIMENT | 1986 | LNF_86_069.pdf | M.AMBROSIO ... P.PATTERI M.PREGER | |
| 1103 | 1986-00-00 | A MEASUREMENT OF hc -- ØØ IN THE RADIATIVE DECAY OF THE J/Y (DM2 Collaboration) | 1986 | LNF_86_070.pdf | D.BISELLO ... A. ANTONELLI R.BALDINI S.CALCATERRA G.CAPON ... | |
| 1039 | 1986-00-00 | SEARCH OF GLUEBALLS IN THE J/Y — g ØØ DECAY (DM2 Collaboration) | 1986 | LNF_86_071.pdf | D. BISELLO, ... A. ANTONELLI, R. BALDINI, S. CALCATERRA, G. CAPON, ... | |
| 1104 | 1986-00-00 | INELASTIC SCATTERING OF PARTICLES ON LIGHT NUCLEI AT Pa=7.0 GeV/c | 1986 | LNF_86_072.pdf | J. BANAIGS, J. BERGER, P. BERTHER, G. BIZARD, M. BOIVIN, M. DE SANCTIS, J. DUFLO, F. L. FABBRI, R. FRASCARIA, L. GOLDZAHL, P. PICOZZA, F. POUIN, L. SATTA | |
| 1105 | 1986-00-00 | CONTAINED EVENTS IN THE MONT-BLANC NUCLEON STABILITY EXPERIMENT | 1986 | LNF_86_073.pdf | G. BATTISTONI, P. CAMPANA, V. CHIARELLA, A. CIOCIO, E. IAROCCI, G.P. MURTAS, G. NICOLETTI, L. SATTA, L. TRASATTI, E. BELLOTTI, E. FIORINI, C. LIGUORI, P. NEGRI, A. PULLIA, S. RAGAZZI, M. ROLLIER, L. ZANOTTI, G. BOLOGNA, C. CASTAGNOLI, B. D'ETTORRE PIAZZOLI, P. GALEOTTI, G. MANNOCCHI, P. PICCHI, O. SAAVEDRA, D.C. CUNDY, M.J. PRICE | |
| 4518 | 1985-12-13 | Design Construction and Test of the Associated Particle Method Vacuum Scattering Chamber of the L.N.L. Fast Neutron Facility | 1985 | INFN-TC_85-23.pdf | R. Cherubini, F. Jimenez, R. Nino, R. Policroniades, B.M. Stievano, A. Varela, G. Moschini, G. Galeazzi, C. Manduchi, M.T. Russo Manduchi, G.F. Segato | |
| 4495 | 1985-11-21 | A Study of the 89y(n.n’g)89y Reaction | 1985 | INFN-BE_85-5.pdf | G. Nardelli, G. Tornielli | |
| 4517 | 1985-11-18 | A High Vacuum Portable Exsiccator | 1985 | INFN-TC_85-22.pdf | R. Pengo, L. Ziomi | |
| 4516 | 1985-11-08 | Registratore per l’Analisi Digitale in Forma di Impulsi | 1985 | INFN-TC_85-21.pdf | E. Spinolo, E. Torcello, S. Vitale | |
| 4515 | 1985-10-28 | Modulo CAMAC per Spettroscopia Gamma in Beam | 1985 | INFN-TC_85-20.pdf | D. Nicotra, F. Giustolisi, L. Sperduto, S. Cavallaro | |
| 4494 | 1985-10-15 | Semiclassical Scattering Theory: Nuclear Elastic Scattering | 1985 | INFN-BE_85-4.pdf | E. Di Salvo | |
| 4513 | 1985-10-14 | Analizzatore Multiplo di Conduttivita’ per Profili Grafitati | 1985 | INFN-TC_85-18.pdf | D. Bisello, G. Menon | |
| 4514 | 1985-10-14 | New Measurement of Rock Contaminations and Neutron Activity in the Gran Sasso Tunnel | 1985 | INFN-TC_85-19.pdf | E. Bellotti, M. Buraschi, E. Fiorini, C. Liguori | |
| 4512 | 1985-09-11 | Studio dell’Impianto Elettrico per Acceleratore H.V. di Ioni a 400 Kvolts | 1985 | INFN-TC_85-17.pdf | B. Platania | |
| 4511 | 1985-09-10 | A Novel Type of Parallel Plate Chamber with a Resistive Germanium Anode and a Two Dimensional Read-out | 1985 | INFN-TC_85-16.pdf | R. Bellazzini, C. Betti, A. Brez, E. Carboni, M.M. Massai, M.R. Torquati | |
| 4490 | 1985-09-01 | Searching for New Underground Phenomena with High Resolution visual Techniques and Magnetic Analysis (ICARUS). A Proposal for the Gran Sasso Laboratory | 1985 | INFN-AE_85-7.pdf | Cern, Harvard, Milano, Padova, Roma Tokyo, Wisconsin Collaboration | |
| 4510 | 1985-08-27 | A Microcomputer Controlled PAL Programmer | 1985 | INFN-TC_85-15.pdf | Gao Zhong-Ren, D. Crosetto | |
| 4509 | 1985-08-20 | Response Functions of an X-Ray Detecting System for Spectral Analysis of Therapeutic Beams | 1985 | INFN-TC_85-14.pdf | F. Groppi, N. Molho, L. Pirola | |
| 4508 | 1985-08-19 | Misura di Fattori di Sputtering di Film Sottili Utilizzando un Fascio di Protoni di 100 KeV | 1985 | INFN-TC_85-13.pdf | L. Torrisi | |
| 4507 | 1985-08-02 | A Device for the Measurement of Tension in Large Surgical Sutures | 1985 | INFN-TC_85-12.pdf | R. Bassini, M.C. Cantone, N. Molho, L. Pirola | |
| 4493 | 1985-07-26 | The Characteristic of the First Excited State of 5Li | 1985 | INFN-BE_85-3.pdf | R. Barna’, D. De Pasquale, G. Fazio, G. Giardina, A. Italiano, F. Mezzanares | |
| 4506 | 1985-07-22 | Programma Plot per l’esecuzione ed il Confronto di Grafici con l’RGL-Library del VAX-11/780 Digital | 1985 | INFN-TC_85-11.pdf | C. Ripepi | |
| 4492 | 1985-07-10 | Una Nuova Determinazione di limiti di Massa per l’Antineutrino | 1985 | INFN-BE_85-2.pdf | A. Blasi, G. Gallinaro, B. Osculati, S. Siri, U. Valbusa, S. Vitale | |
| 4489 | 1985-07-04 | Tachyon Kinematics and Causality | 1985 | INFN-AE_85-6.pdf | E. Recami | |
| 4488 | 1985-06-28 | The Test System of the Digital Electronics for the Charm II Limited Streamer Tubes | 1985 | INFN-AE_85-5.pdf | M. Caria, A. Ereditato, C. Gatto, F. Grancagnolo, V. Palladino, P. Parascandolo, P. Strolin | |
| 4505 | 1985-06-24 | Realizzazione di una Unita’ Logico-Programmabile CAMAC Tramite Supporto CAD | 1985 | INFN-TC_85-10.pdf | U. Baldin, G. Dalle Carbonare, M. Cighetti, E. Macavero | |
| 4487 | 1985-06-14 | Tachyons: May They Have a Role in Elementary Particle Physics? | 1985 | INFN-AE_85-4.pdf | E. Recami, W.A. Rodrigues | |
| 4504 | 1985-06-14 | Spettrometro di Massa a Tempi di Volo per l’Analisi di Ioni Molecolari Prodotti Tramite Plasma Desorption | 1985 | INFN-TC_85-9.pdf | G. Bressanini, C. Castellano, G. Galeazzi, G. Prete | |
| 5646 | 1985-06-12 | CONSIDERATIONS ABOUT THE APPARENT 'SUPERLUMINAL EXPANSIONS' IN ASTROPHYSICS. | 1985 | INFN-AE-85-3.pdf | E. Recami, A. Castellino, G.D. Maccarrone, M.Rodonò. | The ortodox models devised to explain the apparent 'superliminal observed in astrophysics - and here briefly summarized and discussed together expansions' with the experimental data - do not seem to be too much successful. Especially when confronted with the most recent observations, suggesting complicated expansion patterns, even with possible accelerations. At this point it may be, therefore, of some interest to explore the possible alternative models in which actual Superluminal motions take place. To prepare the ground we start from a variational principle, introduce the elements of a tachyon mechanics within special relativity, and argue about the expected behaviour of tachyonic objects when interacting (gravitationally, for instance) among themselves or with ordinary matter. We then review and develope the simplest 'Superluminal models', paying particular attention to the observations which they would give rise to. We conclude that some of them appear to be physically acceptable and are statistically favoured with respect to the ortodox ones. |
| 4503 | 1985-06-10 | A Bragg Curve Ionization Chamber for Accelerator Mass Spectrometry | 1985 | INFN-TC_85-8.pdf | R. Bonetti, E. Fioretto, G. Marcazzan, A. Moroni | |
| 4502 | 1985-06-03 | Un Sistema per il Controllo con Grande Precisione del Flusso e del Rapporto Percentuale di Argon e CO2 di Grande Purezza | 1985 | INFN-TC_85-7.pdf | A. Morelli C. Vecchia | |
| 4501 | 1985-05-20 | Construction of Lead Glass Tubing Matrices for Applications in Medical Physics and High Energy Physics | 1985 | INFN-TC_85-6.pdf | G. Schwartz, M. Cinti, M. Conti, A. Del Guerra, M. Di Fino, R. Habel, V. Perez-Mendez, L. Righini | |
| 4500 | 1985-05-06 | Micro-Learn. A Low Cost Microprocessor Development System for Laboratory Use Based on STD-BUS, Z-80 CPU and CP/M Operating System | 1985 | INFN-TC_85-5.pdf | D. Crosetto | |
| 4499 | 1985-05-02 | Studio di Elementi in Traccia di Interesse Biologico con Tecniche Nucleari: Stato Attuale e Prospettive | 1985 | INFN-TC_85-4.pdf | R. Moro | |
| 4491 | 1985-04-01 | Annual Report 1983/1984 | 1985 | INFN-BE_85-1.pdf | AA. VV. | |
| 4485 | 1985-03-25 | A Model-Theory for Tachyons in Two Dimensions | 1985 | INFN-AE_85-2.pdf | E. Recami, W.A. Rodrigues | |
| 4498 | 1985-03-22 | MSCC: un Sistema a Microprocessore CAMAC Compatibile | 1985 | INFN-TC_85-3.pdf | G. Liguori, P. Torre | |
| 4496 | 1985-03-08 | Use of Egs for Monte Carlo Calculations in Positron Imaging | 1985 | INFN-TC_85-1.pdf | A. Del Guerra, M. Conti, W.R. Nelson | |
| 4497 | 1985-03-08 | The Hispet Project: State of the Art | 1985 | INFN-TC_85-2.pdf | A. Del Guerra, G.K. Lum, V. Perez-Mendez, G. Schwartz | |
| 4484 | 1985-02-21 | Soft Hadronic Interactions at the CERN Colliders | 1985 | INFN-AE_85-1.pdf | V. Palladino | |
| 1107 | 1985-00-00 | DISCHARGE PHENOMENA IN HIGH VACUUM RESONANT CAVITIES | 1985 | LNF_85_001(P).pdf | R. BONI, V. CHIMENTI, P. FERNANDES, R. PARODI, B. SPATARO, F. TAZZIOLI | |
| 1131 | 1985-00-00 | AN INTELLIGENT CONTROLLER FOR DATA ACQUISITION FROM STREAMER TUBE CALORIMETERS | 1985 | LNF_85_002.pdf | G.M. BILEI, O. CIAFFONI, M.L. FERRER, L. TRASATTI | |
| 1108 | 1985-00-00 | DESIGN OF THE CAVITIES FOR RF ENERGY STORAGE | 1985 | LNF_85_003(P).pdf | P. FERNANDES, R. PARODI, C. SALVO, B. SPATARO | |
| 1132 | 1985-00-00 | SPLITTING OF THE MAGNETIC DIPOLE GIANT RESONANCE AND TRIAXIAL DEFORMATION | 1985 | LNF_85_004(P).pdf | F. PALUMBO, A. RICHTER | |
| 1114 | 1985-00-00 | CALCOLO CONTINUO DELLA PRESSIONE IN UNA MACCHINA ACCELERATRICE. APPLICAZIONE AD ADONE | 1985 | LNF_85_005(R).pdf | G. TURCHETTI | |
| 1133 | 1985-00-00 | KNO SCALING VIOLATIONS AND THE APPEARANCE OF THE THREE GLUON COUPLING AT THE COLLIDER | 1985 | LNF_85_006.pdf | G. PANCHERI, Y. N. SRIVASTAVA, M. PALLOTTA | |
| 1115 | 1985-00-00 | PRELIMINARY MEASUREMENTS OF THE GAMMA RAY AND NEUTRON BACKGROUND IN THE GRAN SASSO TUNNEL | 1985 | LNF_85_007(R).pdf | E. FIORINI, C. LIQUORI, A. RINDI | |
| 1116 | 1985-00-00 | AN INTELLIGENT MASS STORAGE SYSTEM FOR CANDI 2 | 1985 | LNF_85_008(NT).pdf | G. DI PIRRO, L. TRASATTI | |
| 1134 | 1985-00-00 | CANDI 2, A CAMAC MICROCOMPUTER SYSTEM FOR A PHYSICS LABORATORY | 1985 | LNF_85_009.pdf | O. CIAFFONI, M.L. FERRER, L. TRASATTI, M. COLI | |
| 1117 | 1985-00-00 | COLLIDER RESULTS AND QCD PREDICTIONS | 1985 | LNF_85_010(P).pdf | G. MARTINELLI | |
| 1135 | 1985-00-00 | CALCOLO NUMERICO DELLE CURVE DI EMISSIONE SPONTANEA E STIMOLATA IN UN FEL E IN UN OPTICAL KLYSTRON | 1985 | LNF_85_011(NT).pdf | F. CINDOLO, L. IDEO, G. PRISCO | |
| 1136 | 1985-00-00 | A LIMITED-STREAMER TUBE ELECTRON DETECTOR WITH HIGH REJECTION POWER AGAINST PIONS | 1985 | LNF_85_012.pdf | M. BASILE, J. BEBIERS, G. BONVICINI, G. CARA ROMEO, L. CIFARELLI, A. CONTIN, M. CURATOLO, G. D'ALI, C. DEL PAPA, B. ESPOSITO, D. FABBRI, P. GIUSTI, T. MASSAM, F. MASSERA, R. NANIA, G. NATALE, F. PALMONARI, G. SARTORELLI, M. SPINETTI, G. SUSINNO, L. VOTANO, Z. ZICHICHI | |
| 1137 | 1985-00-00 | HYSTERETIC EFFECTS IN THE D.C. CURRENT-VOLTAGE CHARACTERISTIC OF NORMAL Nb/Pb TUNNEL JUNCTIONS | 1985 | LNF_85_013(P).pdf | F. CELANI, S. PACE, M. BAFFA | |
| 1118 | 1985-00-00 | HIGHER ORDER E.M. RADIATIVE CORRECTIONS TO e+e- Æ m+m - AROUND THE Zo. | 1985 | LNF_85_014(R).pdf | M. GRECO | |
| 1138 | 1985-00-00 | PHOTONUCLEAR REACTIONS AT FRASCATI | 1985 | LNF_85_015(P).pdf | E. DE SANCTIS | |
| 1139 | 1985-00-00 | VOLTAGE INDUCED INSTABILITIES OF THE TUNNEL BARRIER IN Nb/Pb JUNCTION | 1985 | LNF_85_016(P).pdf | F. CELANI, S. CATA', S. PACE, A. FERRIGNO | |
| 1140 | 1985-00-00 | EXAFS STUDIES ON THE C-HEME ENVIRONMENT IN NATIVE AND CHEMICALLY MODIFIED CYTOCHROMES | 1985 | LNF_85_017.pdf | A. COLOSIMO, F. ANDREASI-BASSI, S. MOBILIO | |
| 1141 | 1985-00-00 | O2 AND Co BONDING GEOMETRY IN HEME-PROTEINS IN SOLUTION INVESTIGATED BY XANES | 1985 | LNF_85_018.pdf | A. CONGIU-CASTELLANO, E. BURATTINI | |
| 1142 | 1985-00-00 | NOBLE METAL SMALL CLUSTER EXAFS | 1985 | LNF_85_019.pdf | S. MOBILIO, E. BURATTINI | |
| 1143 | 1985-00-00 | SHORT RANGE ORDER IN a-GexSi1-x:H ALLOYS | 1985 | LNF_85_020.pdf | L. INCOCCIA, S. MOBILIO | |
| 1144 | 1985-00-00 | EXAFS ON SILVER BORATE GLASSES | 1985 | LNF_85_021.pdf | P. FORNASINI, E. BERNIERI, E. BURATTINI | |
| 1145 | 1985-00-00 | EXAFS AND XANES STUDY OF Ti COORDINATION IN TiO2 CONTAINING GLASSES UPON THERMAL TREATMENT | 1985 | LNF_85_022.pdf | M. EMILI, L. INCOCCIA, S. MOBILIO | |
| 1146 | 1985-00-00 | XANES IN SbSl, Sb2S3, Sb2S5 | 1985 | LNF_85_023.pdf | G. D'ALBA, P. FORNASINI, E. BURATTINI | |
| 1147 | 1985-00-00 | DEUTERON PHOTODISINTEGRATION BETWEEN 100 MeV AND 255 MeV | 1985 | LNF_85_024(P).pdf | E. DE SANCTIS, M. ANGHINOLFI, N. BIANCHI, G.P. CAPITANI, P. CORVISIERO, P. DI GIACOMO, C. GUARALDO, V. LUCHERINI, E. POLLI, A. R. REOLON, G. RICCO, M. SANZONE, A. ZUCCHIATTI | |
| 1148 | 1985-00-00 | M.A.S.S.:"MATTER ANTIMATTER SPACE SPECTROMETER".A SPACE EXPERIMENT FOR THE MEASUREMENT OF THE FLUX OF COSMIC RAY ANTIMATTER | 1985 | LNF_85_025(R).pdf | G. AURIEMMA, S. BARTALUCCI, G. BASINI, F. BONGIORNO, A. CAPONE, D. DE PEDIS, M. RICCI, A. SCIUBBA, P. SPILLANTINI | |
| 1149 | 1985-00-00 | MULTIPLE SCATTERING REGIME AND HIGHER ORDER CORRELATIONS IN X-RAY ABSORPTION SPECTRA OF LIQUID SOLUTIONS | 1985 | LNF_85_026(P).pdf | M. BENFATTO, C.R. NATOLI, A. BIANCONI, J. GARCIA, A. MARCELLI, M. FANFONI, I. DAVOLI | |
| 1150 | 1985-00-00 | EFFECT OF INTERMEDIATE RANGE ORDER ON THE LINESHAPE OF THE GeK EDGE | 1985 | LNF_85_027.pdf | M.G. PROIETTI, S. MOBILIO, A. GARGANO, L. INCOCCIA, F. EVANGELISTI | |
| 1119 | 1985-00-00 | FURTHER MEASUREMENTS OF NEUTRON FLUXES AT THE GRAN SASSO LABORATORIES | 1985 | LNF_85_028(R).pdf | A. RINDI, F. CELANI, F. CARDONE | |
| 1151 | 1985-00-00 | QUANTIZATION OF GAUGE THEORIES ON A TORUS | 1985 | LNF_85_030(P).pdf | F. PALUMBO | |
| 1152 | 1985-00-00 | ELECTRON STORAGE RINGS FOR THE PRODUCTION OF SYNCHROTRON RADIATION | 1985 | LNF_85_031(P).pdf | S. TAZZARI | |
| 1120 | 1985-00-00 | CALCULATION OF SPECTRUM AND ANGULAR DISTRIBUTION NEAR THE PEAK OF AN UNDULATOR | 1985 | LNF_85_032(R).pdf | R. COISSON | |
| 1153 | 1985-00-00 | VECTOR BOSON PRODUCTION AT PRESENT AND FUTURE COLLIDERS | 1985 | LNF_85_033.pdf | G. ALTARELLI, R.K. ELLIS, G. MARTINELLI | |
| 1121 | 1985-00-00 | RAPPORTO ATTIVITA' ANNUAL REPORT 1984 | 1985 | LNF_85_035(R).pdf | Curato dal Servizio Documentazione | |
| 1154 | 1985-00-00 | A STRUCTURAL INVESTIGATION ON SMALL GOLD CLUSTERS BY EXAFS | 1985 | LNF_85_036.pdf | A. BALERNA, E. BERNIERI, P. PICOZZI, A. REALE, S. SANTUCCI, E. BURATTINI, S. MOBILIO | |
| 1155 | 1985-00-00 | STATE OF ART STORAGE RINGS FOR FEL OPERATION | 1985 | LNF_85_037.pdf | M.A. PREGER | |
| 1156 | 1985-00-00 | THE EFFECT OF INTRA-BEAM SCATTERING ON THE DESIGN OF LOW EMITTANCE STORAGE RINGS FOR FEL OPERATION | 1985 | LNF_85_038.pdf | S. GUIDUCCI, M. A. PREGER, L. PALUMBO | |
| 1157 | 1985-00-00 | COLLIDER PHYSICS AND THE STANDARD MODEL | 1985 | LNF_85_039(P).pdf | M. GRECO | |
| 1122 | 1985-00-00 | EFFETTI DELLE CARATTERISTICHE DEL FASCIO ELETTRONICO SULL'EMISSIONE SPONTANEA E STIMOLATA DA UN OPTICAL KLYSTRON | 1985 | LNF_85_040(R).pdf | L. IDEO, F. CINDOLO, G. PRISCO | |
| 1158 | 1985-00-00 | A SIMPLE, LOW NOISE, TRUE INSTRUMENTATION AMPLIFIER FOR D.C. AND LOW FREQUENCY CHARACTERIZATION OF HIGH IMPENDANCE TUNNEL JUNCTIONS | 1985 | LNF_85_041(P).pdf | F. CELANI, M. BAFFA, S. CATA', R. FALCIONI, S. PACE | |
| 1109 | 1985-00-00 | POLARIZED X-RAY ABSORPTION NEAR EDGE STRUCTURE OF HIGHLY OXIDIZED Cr PORPHYRINS | 1985 | LNF_85_042(P).pdf | J. E. PENNER - HAHN, M. BENFATTO, K. O. HODGSON, B. HEDMAN, J. T. GROVES, S. DONIACH | |
| 1110 | 1985-00-00 | ON THE BASIC STRUCTURAL UNIT OF AMORPHOUS V2O5 FROM XANES AND EXAFS | 1985 | LNF_85_043(P).pdf | S. STIZZA, M. BENFATTO, I. DAVOLI, G. MANCINI, A. MARCELLI, A. BIANCONI, M. TOMELLINI, J. GARCIA, C. R. NATOLI | |
| 1111 | 1985-00-00 | XANEX (X-RAY ABSORPTION NEAR EDGE STRUCTURE): A NEW PROBE OF HIGHER ORDER CORRELATION FUNCTION IN AMORPHOUS SEMICONDUCTORS | 1985 | LNF_85_044(P).pdf | M. BENFATTO, C. R. NATOLI, A. BIANCONI, I. DAVOLI, J. GARCIA, A. MARCELLI, S. STIZZA | |
| 1159 | 1985-00-00 | ZERO MOMENTUM MODES IN GAUGE THEORIES ON A TORUS | 1985 | LNF_85_045(P).pdf | F. PALUMBO | |
| 1160 | 1985-00-00 | USE OF GENERAL POTENTIALS IN MULTIPLE-SCATTERING THEORY | 1985 | LNF_85_046(P).pdf | C.R. NATOLI, M. BENFATTO, S. DONIACH | |
| 1161 | 1985-00-00 | JETS IN MINIMUM BIAS PHYSICS | 1985 | LNF_85_047.pdf | G. PANCHERI, Y.N. SRIVASTAVA | |
| 1162 | 1985-00-00 | THE NUSEX DETECTOR | 1985 | LNF_85_048(P).pdf | G. BATTISTONI, E. BELLOTTI, C. BLOISE, G. BOLOGNA, P. CAMPANA, C. CASTAGNOLI, V. CHIARELLA, O. CREMONESI, D. CUNDY, B. D'ETTORE-PIAZZOLI, E. FIORINI, E. IAROCCI, G. MANNOCCHI, G.P. MURTAS, P. NEGRI, G. NICOLETTI, P. PICCHI, M. PRICE, A. PILLIA, S. RAGAZZI, M. ROLLIER, F. RONGA, O. SAAVEDRA, L. ZANOTTI | |
| 1123 | 1985-00-00 | A COMPUTER CONTROLLED SYSTEM FOR TESTING LARGE QUANTITIES OF PHOTOMULTIPLIER TUBES | 1985 | LNF_85_049(R).pdf | S. BIANCO, L. DANIELLO, M. ENORINI, F.L. FABBRI, P.L. FABRETTI, M. GIARDONI, M. OCCHIGROSSI, L. PASSAMONTI, V. RUSSO, A. SALA, A. SCOTTI-DI-UCCIO, A. SPALLONE, A. ZALLO | |
| 1163 | 1985-00-00 | MULTIELECTRON CONFIGURATIONS IN THE X-RAY ABSORPTION NEAR-EDGE STRUCTURE (XANES) OF NiO AT OXIGEN K THRESHOLD | 1985 | LNF_85_050(P).pdf | I. DAVOLI, A. BIANCONI, A. MARCELLI, M. TOMELLINI, M. FANFONI | |
| 1164 | 1985-00-00 | LOCAL ELECTRONIC STRUCTURES AT SELECTED SITES OF INTERMETALLIC PEROVSKITES Mn3MeX (Me=DIVALENT METAL, X=N,C) | 1985 | LNF_85_051(P).pdf | J. GARCIA, A. BIANCONI, A. MARCELLI, I. DAVOLI, J. BARTOLOME | |
| 1124 | 1985-00-00 | FOURIER ANALYSIS OF COSMIC RAYS ARRIVAL TIMES | 1985 | LNF_85_052(R).pdf | C. BLOISE | |
| 1112 | 1985-00-00 | LOCAL ORDER AT MANGANESE SITES IN IONIC SOLUTIONS BY XANES (X-RAY ABSORPTION NEAR EDGE STRUCTURE) | 1985 | LNF_85_053(P).pdf | M. BENFATTO, C.R. NATOLI, J. GARCIA, A. BIANCONI, A. MARCELLI, I. DAVOLI | |
| 1165 | 1985-00-00 | ENGINEERING THE CHIRAL ANOMALY: VACUUM SPIN WAVES | 1985 | LNF_85_054(P).pdf | Y.N. SRIVASTAVA, A. WIDOM | |
| 1125 | 1985-00-00 | LOCAL AREA NETWORK EXPANSION AND HIGH SPEED INTERLABORATORY LINKS | 1985 | LNF_85_055(R).pdf | O. CIAFFONI, M.L. FERRER, L. TRASATTI | |
| 1166 | 1985-00-00 | THE INTERATOMIC INTERMEDIATE VALENCE STATE OF INSULATING 4f-COMPOUNDS DETECTED BY X-RAY ABSORPTION SPECTROSCOPY | 1985 | LNF_85_056(P).pdf | A. BIANCONI, A. MARCELLI, H. DEXPERT, R. KARNATAK, A. KOTANI, T. JO, J. PETIAU | |
| 1126 | 1985-00-00 | INCLUSIVE PHOTOPROTON SPECTRA FROM 12C AT INTERMEDIATE ENERGIES | 1985 | LNF_85_057(P).pdf | M. ANGHINOLFI, V. LUCHERINI, N. BIANCHI, G.P. CAPITANI, P. CORVISIERO, E. DE SANCTIS, P. DI GIACOMO, C. GUARALDO, P. LEVI-SANDRI, E. POLLI, A.R. REOLON, G. RICCO, M. SANZONE, M. TAIUTI | |
| 1168 | 1985-00-00 | STATUS OF ADONE AS SYNCHROTRON RADIATION SOURCE | 1985 | LNF_85_059(P).pdf | S. BARTALUCCI | |
| 1169 | 1985-00-00 | STRANGE QUARK MATTER FROM CYGNUS X-3 | 1985 | LNF_85_060(P).pdf | A. SEGUI' | |
| 1113 | 1985-00-00 | A LED SYSTEM TO CONTROL THE GAIN STABILITY OF NaI DETECTORS | 1985 | LNF_85_061.pdf | M. ANGHINOLFI, M. CASTOLDI, M. ALBICOCCO, E. POLLI | |
| 1127 | 1985-00-00 | THE TENSOR ANALYZING POWER IN BACKWARD pd ELASTIC SCATTERING AND ITS RELATION TO pp -- pd AT INTERMEDIATE ENERGIES | 1985 | LNF_85_062.pdf | A. NAKAMURA, L. SATTA | |
| 1170 | 1985-00-00 | DIFFRACTIVE ONE-PION PRODUCTION IN THE ap Æ aX PROCESS AT Pa =7.0 GeV/c | 1985 | LNF_85_063.pdf | J. BANAIGS, J. BERGER, A. CODINO, J. DUFLO, L. GOLDZAHL, F. PLOUIN, M. DE SANCTIS, F. L. FABBRI, P. PICOZZA, L. SATTA, P. BERTHET, R. FRASCARIA, M. BOIVIN | |
| 1171 | 1985-00-00 | PROGETTO MAGNETICO DEI COMPENSATORI PER S.CO.W. | 1985 | LNF_85_064(R).pdf | C. SANELLI | |
| 1128 | 1985-00-00 | PARALLEL LINK BETWEEN A VAX AND A VME SYSTEM | 1985 | LNF_85_065(NT).pdf | G. NOVELLI, L. TRASATTI | |
| 1129 | 1985-00-00 | VME-ETHERNET INTERCONNECTION | 1985 | LNF_85_066(NT).pdf | M.L. FERRER, E. PACE, L. TRASATTI | |
| 1172 | 1985-00-00 | INELASTIC INTERACTION OF ANTIPROTONS WITH 4He NUCLEI BETWEEN 200 AND 600 MeV/c | 1985 | LNF_85_067.pdf | F. BALESTRA, S. BOSSOLASCO, M.P. BUSSA, L. BUSSO, L. FERRERO, D. PANZIERI, G. PIRAGINO, F. TOSELLO, C. GUARALDO, A. MAGGIORA, Yu.A. BATUSOV, I.V. FALOMKIN, G.B. PONTECORVO, M.G. SAPOZHNIKOV, G. BENDISCIOLI, V. FILIPPINI, G. FUMAGALLI, C. MARCIANO, A. ROTONDI, A. ZENONI, E. LODI-RIZZINI, M. VASCON, G. ZANELLA | |
| 1130 | 1985-00-00 | PHYSICS WITH POLARIZED PHOTONS | 1985 | LNF_85_068.pdf | G. MATONE | |
| 4445 | 1984-12-18 | New Solutions for Mathieu’s Differential Equations | 1984 | INFN-AE_84-14.pdf | D. Picca | |
| 4483 | 1984-12-11 | Il Progetto Ciclotrone per Usi Biomedici di Milano: Valutazioni sulla Attivazione Indotta nell’Aria | 1984 | INFN-TC_84-29.pdf | C. Birattari, M. Bonardi, A. Ferrari, M. Silari | |
| 4444 | 1984-11-26 | A Forward Calorimeter for HERA | 1984 | INFN-AE_84-13.pdf | G. Cecchet et al. | |
| 4482 | 1984-11-14 | Automatized Microscope for Nuclear Emulsion Analysis | 1984 | INFN-TC_84-28.pdf | M. Dameri, M. Marinelli, F. Montano, M. Sannino, G. Tomasini | |
| 4480 | 1984-10-29 | A Fast Event Generator for Particle Physics | 1984 | INFN-TC_84-26.pdf | G. Iaselli | |
| 4481 | 1984-10-29 | A Non Conventional Test of Scaling Violation in Deep Inelastic Scattering | 1984 | INFN-TC_84-27.pdf | G. Iaselli | |
| 4455 | 1984-10-29 | ADG: an Amplitude and Delay Generator | 1984 | INFN-BE_84-9.pdf | C. Tuniz | |
| 4479 | 1984-10-25 | The Magnetic Structure of the Milan Superconducting Cyclotron | 1984 | INFN-TC_84-25.pdf | C. De Martinis, D. Giove | |
| 1246 | 1984-10-22 | Distance Defendence Of Continuum And Bound State Of Excitonic Resonances In X-Ray Absorption Near Edge Structure (XANES) | 1984 | LNF-84-063(P).pdf | C.R. Natoli | |
| 4456 | 1984-10-22 | New Dipole Resonances Excited by Radiative Capture Reactions: a Peoposal for NAC | 1984 | INFN-BE_84-10.pdf | R. Bassini, P. Guazzoni Quiang Yujun, L. Zetta, A. Zucchiatti | |
| 4478 | 1984-10-19 | Gamma-Emitting Tc Radiotracers Production for Waste Disposal Studies at Milan AVF Cyclotron | 1984 | INFN-TC_84-24.pdf | C. Birattari, M. Bonardi, M. Castiglioni, J. Edel, M. Gattinoni, F. Mousty, E. Sabbioni | |
| 4477 | 1984-10-18 | A Compact Electronic Apparatus for the Bragg-Curve Analysis in Axial Ionization Chambers | 1984 | INFN-TC_84-23.pdf | R. Bassini, I. Iori, A. Moroni, G. Taiocchi | |
| 4442 | 1984-10-16 | Silicon Multilayer Target for a High Intensity Charm Photoproduction Experiment | 1984 | INFN-AE_84-11.pdf | R. Barate et al. | |
| 4443 | 1984-10-16 | Energy Resolution and Longitudinal Shower Development in a Si/W Electromagnetic Calorimeter |