Issue |
ND 2007
2007
|
|
---|---|---|
Article Number | 159 | |
Number of page(s) | 4 | |
Section | Neutron cross section measurements | |
DOI | https://doi.org/10.1051/ndata:07519 | |
Published online | 17 June 2008 |
DOI: 10.1051/ndata:07519
Capture cross section measurements of 186,187,188Os at n_TOF: the resolved resonance region
K. Fujii1, M. Mosconi2, P.M. Milazzo1, C. Domingo-Pardo2, 3, F. Käppeler2, A. Mengoni4, 5, U. Abbondanno1, G. Aerts6, H. Álvarez7, F. Álvarez-Velarde8, S. Andriamonje6, J. Andrzejewski9, P. Assimakopoulos10, L. Audouin11, G. Badurek12, P. Baumann13, F. Becvár14, E. Berthoumieux6, F. Calviño15, M. Calviani16, 17, D. Cano-Ott8, R. Capote4, 18, C. Carrapiço6, 19, P. Cennini5, V. Chepel20, E. Chiaveri5, N. Colonna21, G. Cortes22, A. Couture23, J. Cox23, M. Dahlfors5, S. David11, I. Dillmann2, W. Dridi6, I. Duran7, C. Eleftheriadis24, M. Embid-Segura8, L. Ferrant11, A. Ferrari5, R. Ferreira-Marques20, W. Furman25, I. Goncalves20, E. González-Romero8, F. Gramegna16, C. Guerrero8, F. Gunsing6, B. Haas26, R. Haight27, M. Heil2, A. Herrera-Martinez5, M. Igashira28, E. Jericha12, Y. Kadi5, D. Karadimos10, D. Karamanis10, M. Kerveno13, P. Koehler29, E. Kossionides30, M. Krticka14, C. Lampoudis6, 24, H. Leeb12, A. Lindote20, I. Lopes20, M. Lozano18, S. Lukic13, J. Marganiec9, S. Marrone21, T. Martínez8, C. Massimi31, P. Mastinu16, C. Moreau1, F. Neves20, H. Oberhummer12, S. O'Brien23, J. Pancin6, C. Papachristodoulou10, C. Papadopoulos32, C. Paradela7, N. Patronis10, A. Pavlik33, P. Pavlopoulos34, L. Perrot6, M.T. Pigni12, R. Plag2, A. Plompen35, A. Plukis6, A. Poch22, J. Praena16, C. Pretel22, J. Quesada18, T. Rauscher36, R. Reifarth27, C. Rubbia37, G. Rudolf13, P. Rullhusen35, J. Salgado19, C. Santos19, L. Sarchiapone5, I. Savvidis24, C. Stephan11, G. Tagliente21, J.L. Tain3, L. Tassan-Got11, L. Tavora19, R. Terlizzi21, G. Vannini31, P. Vaz19, A. Ventura38, D. Villamarin8, M.C. Vincente8, V. Vlachoudis5, R. Vlastou32, F. Voss2, S. Walter2, M. Wiescher23 and K. Wisshak21 Istituto Nazionale di Fisica Nucleare, Trieste, Italy
2 Forschungszentrum Karlsruhe GmbH (FZK), Institut für Kernphysik, Germany
3 Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Spain
4 International Atomic Energy Agency (IAEA), Nuclear Data Section, Vienna, Austria
5 CERN, Geneva, Switzerland
6 CEA/Saclay-DSM/DAPNIA, Gif-sur-Yvette, France
7 Universidade de Santiago de Compostela, Spain
8 Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid, Spain
9 University of Lodz, Lodz, Poland
10 University of Ioannina, Greece
11 Centre National de la Recherche Scientifique/IN2P3-IPN, Orsay, France
12 Atominstitut der Österreichischen Universitäten,Technische Universität Wien, Austria
13 Centre National de la Recherche Scientifique/IN2P3-IReS, Strasbourg, France
14 Charles University, Prague, Czech Republic
15 Universidad Politecnica de Madrid, Spain
16 Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Italy
17 Dipartimento di Fisica, Università di Padova, Italy
18 Universidad de Sevilla, Spain
19 Instituto Tecnológico e Nuclear (ITN), Lisbon, Portugal
20 LIP-Coimbra & Departamento de Fisica da Universidade de Coimbra, Portugal
21 Istituto Nazionale di Fisica Nucleare, Bari, Italy
22 Universitat Politecnica de Catalunya, Barcelona, Spain
23 University of Notre Dame, Notre Dame, USA
24 Aristotle University of Thessaloniki, Greece
25 Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, Dubna, Russia
26 Centre National de la Recherche Scientifique/IN2P3-CENBG, Bordeaux, France
27 Los Alamos National Laboratory, New Mexico, USA
28 Tokyo Institute of Technology, Tokyo, Japan
29 Oak Ridge National Laboratory, Physics Division, Oak Ridge, USA
30 NCSR, Athens, Greece
31 Dipartimento di Fisica, Università di Bologna, and Sezione INFN di Bologna, Italy
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 Physics-University of Basel, Switzerland
37 Università degli Studi Pavia, Pavia, Italy
38 ENEA, Bologna, Italy
kfujii@ts.infn.it
Published online: 21 May 2008
Abstract
The neutron capture cross sections of 186,187,188Os have been measured at the CERN neutron time-of-flight facility, n_TOF, in the neutron energy range from 1 eV up to 1 MeV. In this contribution, we report the results of the analysis of the resolved resonance region (RRR). Resonance parameters have been extracted from a full R-matrix fit of the capture yields with the SAMMY code. A statistical analysis has been performed and the related average resonance parameters are derived. This information is crucial for a complete understanding and modeling in terms of the Hauser-Feshbach statistical model of the capture and inelastic reaction channels, required for the evaluation of the stellar reaction rates of these isotopes. Maxwellian average cross sections for the range of temperatures relevant for s-process nucleosynthesis have been derived from the combined information of the experimental data in the resolved and unresolved resonance regions. A brief account of the implications of this analysis in the estimation of the s-process component of the 187Os abundance and the related impact on the estimates of the time-duration of the galactic nucleosynthesis through the Re/Os clock is given.
© CEA 2008