International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07554

Measurement of the ¹⁹⁷Au (n,γ) cross section at n_TOF: towards a new standard

C. Massimi¹, U. Abbondanno², G. Aerts³, H. Álvarez⁴, F. Álvarez-Velarde⁵, S. Andriamonje³, J. Andrzejewski⁶, P. Assimakopoulos⁷, L. Audouin⁸, G. Badurek⁹, P. Baumann¹⁰, F. Becvár¹¹, E. Berthoumieux³, F. Calviño¹², M. Calviani^{13, 14}, D. Cano-Ott⁵, R. Capote^{15, 16}, C. Carrapiço^{3, 17}, P. Cennini¹⁸, V. Chepel¹⁹, E. Chiaveri¹⁸, N. Colonna²⁰, G. Cortes²¹, A. Couture²², J. Cox²², M. Dahlfors¹⁸, S. David⁸, I. Dillmann²³, C. Domingo-Pardo^{23, 24}, W. Dridi³, I. Duran⁴, C. Eleftheriadis²⁵, M. Embid-Segura⁵, L. Ferrant⁸, A. Ferrari¹⁸, R. Ferreira-Marques¹⁹, K. Fujii², W. Furman²⁶, I. Goncalves¹⁹, E. González-Romero⁵, F. Gramegna¹³, C. Guerrero⁵, F. Gunsing³, B. Haas²⁷, R. Haight²⁸, M. Heil²³, A. Herrera-Martinez¹⁸, M. Igashira²⁹, E. Jericha⁹, F. Käppeler²³, Y. Kadi¹⁸, D. Karadimos⁷, D. Karamanis⁷, M. Kerveno¹⁰, P. Koehler³⁰, E. Kossionides³¹, M. Krticka¹¹, C. Lampoudis^{25, 3}, H. Leeb⁹, A. Lindote¹⁹, I. Lopes¹⁹, M. Lozano¹⁶, S. Lukic¹⁰, J. Marganiec⁶, S. Marrone²⁰, T. Martínez⁵, P. Mastinu¹³, A. Mengoni^{15, 18}, P.M. Milazzo², C. Moreau², M. Mosconi²³, F. Neves¹⁹, H. Oberhummer⁹, S. O'Brien²², J. Pancin³, C. Papachristodoulou⁷, C. Papadopoulos³², C. Paradela⁴, N. Patronis⁷, A. Pavlik³³, P. Pavlopoulos³⁴, L. Perrot³, M.T. Pigni⁹, R. Plag²³, A. Plompen³⁵, A. Plukis³, A. Poch²¹, J. Praena¹³, C. Pretel²¹, J. Quesada¹⁶, T. Rauscher³⁶, R. Reifarth²⁸, C. Rubbia³⁷, G. Rudolf¹⁰, P. Rullhusen³⁵, J. Salgado¹⁷, C. Santos¹⁷, L. Sarchiapone¹⁸, I. Savvidis²⁵, C. Stephan⁸, G. Tagliente²⁰, J.L. Tain²⁴, L. Tassan-Got⁸, L. Tavora¹⁷, R. Terlizzi²⁰, G. Vannini¹, P. Vaz¹⁷, A. Ventura³⁸, D. Villamarin⁵, M.C. Vincente⁵, V. Vlachoudis¹⁸, R. Vlastou³², F. Voss²³, S. Walter²³, M. Wiescher²² and K. Wisshak<sup>23

1</sup>  Dipartimento di Fisica, Università di Bologna, and Sezione INFN di Bologna, Italy
²  Istituto Nazionale di Fisica Nucleare, Trieste, Italy
³  CEA/Saclay-DSM/DAPNIA, Gif-sur-Yvette, France
⁴  Universidade de Santiago de Compostela, Spain
⁵  Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid, Spain
⁶  University of Lodz, Lodz, Poland
⁷  University of Ioannina, Greece
⁸  Centre National de la Recherche Scientifique/IN2P3--IPN, Orsay, France
⁹  Atominstitut der Österreichischen Universitäten, Technische Universität Wien, Austria
¹⁰  Centre National de la Recherche Scientifique/IN2P3-IReS, Strasbourg, France
¹¹  Charles University, Prague, Czech Republic
¹²  Universidad Politecnica de Madrid, Spain
¹³  Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Italy
¹⁴  Dipartimento di Fisica, Università di Padova, Italy
¹⁵  International Atomic Energy Agency (IAEA), Nuclear Data Section, Vienna, Austria
¹⁶  Universidad de Sevilla, Spain
¹⁷  Instituto Tecnológico e Nuclear (ITN), Lisbon, Portugal
¹⁸  CERN, Geneva, Switzerland
¹⁹  LIPCoimbra & Departamento de Fisica da Universidade de Coimbra, Portugal
²⁰  Istituto Nazionale di Fisica Nucleare, Bari, Italy
²¹  Universitat Politecnica de Catalunya, Barcelona, Spain
²²  University of Notre Dame, Notre Dame, USA
²³  Forschungszentrum Karlsruhe GmbH (FZK), Institut für Kernphysik, Germany
²⁴  Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Spain
²⁵  Aristotle University of Thessaloniki, Greece
²⁶  Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, Dubna, Russia
²⁷  Centre National de la Recherche Scientifique/IN2P3CENBG, Bordeaux, France
²⁸  Los Alamos National Laboratory, New Mexico, USA
²⁹  Tokyo Institute of Technology, Tokyo, Japan
³⁰  Oak Ridge National Laboratory, Physics Division, Oak Ridge, USA
³¹  NCSR, Athens, Greece
³²  National Technical University of Athens, Greece
³³  Institut für Isotopenforschung und Kernphysik, Universität Wien, Austria
³⁴  Pôle Universitaire Léonard de Vinci, Paris-La Défense, France
³⁵  CEC-JRC-IRMM, Geel, Belgium
³⁶  Department of PhysicsUniversity of Basel, Switzerland
³⁷  Università degli Studi Pavia, Pavia, Italy
³⁸  ENEA, Bologna, Italy

massimi@bo.infn.it

Published online: 21 May 2008

Abstract
Two different detectors and techniques are employed at n_TOF facility, at CERN, to improve the accuracy of the neutron capture cross section of ¹⁹⁷Au(n,γ): a total absorption calorimeter and a set of C₆D₆. The accurate knowledge of this cross section is of great importance for all the (n,γ) reactions study. The neutron capture cross section and nuclear resonce parameters of the ¹⁹⁷Au have been measured in the energy range of 1 eV to 1 kev. The present work shows in average a good agreement with evaluated data libraries, although sizeable differences have been observed for some resonances. Two new resonances have also been discovered. The accuracy of the resonance partial widths has been improved and the main nuclear quantities such as the neutron strength function have been extracted.

© CEA 2008