Phys. Rev. C
82,
015802
(2010)
[10 pages]
Neutron physics of the Re/Os clock. I. Measurement of the (n,γ) cross sections of 186,187,188Os at the CERN n_TOF facility
M. Mosconi et al. (The n_TOF Collaboration)
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M. Mosconi1, K. Fujii2, A. Mengoni3,18, C. Domingo-Pardo1,4, F. Käppeler1, U. Abbondanno2, G. Aerts5, H. Álvarez-Pol6, F. Alvarez-Velarde7, S. Andriamonje5, J. Andrzejewski8, P. Assimakopoulos9, L. Audouin1, G. Badurek10, P. Baumann11, F. Bečvář12, F. Belloni2, E. Berthoumieux5, S. Bisterzo1,13, M. Calviani14, F. Calviño15, D. Cano-Ott7, R. Capote3,16, A. Carrillo de Albornoz17, P. Cennini18, V. Chepel19, E. Chiaveri18, N. Colonna20, G. Cortes15, A. Couture21, J. Cox21, M. Dahlfors18, S. David22, I. Dillmann1, R. Dolfini23, W. Dridi5, I. Duran6, C. Eleftheriadis24, M. Embid-Segura7, L. Ferrant22, A. Ferrari18, R. Ferreira-Marques19, L. Fitzpatrick18, H. Frais-Koelbl3, W. Furman25, R. Gallino13, I. Goncalves19, E. Gonzalez-Romero7, A. Goverdovski26, F. Gramegna14, E. Griesmayer3, C. Guerrero7, F. Gunsing5, B. Haas27, R. Haight28, M. Heil1, A. Herrera-Martinez18, M. Igashira29, S. Isaev22, E. Jericha10, Y. Kadi18, D. Karamanis9, D. Karadimos9, M. Kerveno11, V. Ketlerov17,25, P. Koehler30, V. Konovalov17,24, E. Kossionides31, M. Krtička12, C. Lamboudis9, H. Leeb10, A. Lindote19, I. Lopes19, M. Lozano16, S. Lukic11, J. Marganiec8, L. Marques17, S. Marrone20, C. Massimi32, P. Mastinu14, P. M. Milazzo2, C. Moreau2, F. Neves19, H. Oberhummer10, M. Oshima33, S. O’Brien21, J. Pancin5, C. Papachristodoulou9, C. Papadopoulos34, C. Paradela6, N. Patronis9, A. Pavlik35, P. Pavlopoulos36, L. Perrot5, R. Plag1, A. Plompen37, A. Plukis5, A. Poch15, J. Praena16, C. Pretel15, J. Quesada16, T. Rauscher38, R. Reifarth28, M. Rosetti39,*, C. Rubbia23, G. Rudolf11, P. Rullhusen37, J. Salgado17, L. Sarchiapone18, I. Savvidis24, C. Stephan22, G. Tagliente20, J. L. Tain4, L. Tassan-Got22, L. Tavora17, R. Terlizzi20, G. Vannini32, P. Vaz17, A. Ventura39, D. Villamarin7, M. C. Vincente7, V. Vlachoudis18, R. Vlastou34, F. Voss1, S. Walter1, H. Wendler18, M. Wiescher21, and K. Wisshak1 (The n_TOF Collaboration)
1Karlsruhe Institute of Technology (KIT), Campus Nord, Institut für Kernphysik, D-76021 Karlsruhe, Germany
2Istituto Nazionale di Fisica Nucleare, I-34149 Trieste, Italy
3International Atomic Energy Agency, NAPC-Nuclear Data Section, A-1400 Vienna, Austria
4Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46980 Paterna, Spain
5CEA/Saclay, DSM, F-91191 Gif-sur-Yvette, France
6Universidade de Santiago de Compostela, 15782, Spain
7Centro de Investigaciones Energeticas Medioambientales y Technologicas, E-28040 Madrid, Spain
8University of Lodz, PL-90-142 Lodz, Poland
9University of Ioannina, GR-451 10 Ioannina, Greece
10Atominstitut der Österreichischen Universitäten, Technische Universität Wien, A-1020 Vienna, Austria
11Centre National de la Recherche Scientifique/IN2P3, IReS, F-67037 Strasbourg, France
12Charles University, CZ-252 41 Prague, Czech Republic
13Dipartimento di Fisica Generale, Università di Torino, I-10149 Torino, Italy
14Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali di Legnaro, I-35020 Legnaro (Padova), Italy
15Universitat Politecnica de Catalunya, E-08034 Barcelona, Spain
16Universidad de Sevilla, E-41004 Sevilla, Spain
17Instituto Tecnológico e Nuclear (ITN), P-2686-953 Sacavém (Lisbon), Portugal
18CERN, CH-1211 Geneva, Switzerland
19LIP, Coimbra & Departamento de Fisica da Universidade de Coimbra, P-3004-531 Coimbra, Portugal
20Istituto Nazionale di Fisica Nucleare, I-70126 Bari, Italy
21University of Notre Dame, Notre Dame, IN 46556, USA
22Centre National de la Recherche Scientifique/IN2P3, IPN, F-91406 Orsay, France
23Università degli Studi Pavia, I-27100 Pavia, Italy
24Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece
25Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, RUS-141980 Dubna, Russia
26Institute of Physics and Power Engineering, Kaluga region, RUS-249020 Obninsk, Russia
27Centre National de la Recherche Scientifique/IN2P3 - CENBG, F-33175 Gradignan (Bordeaux), France
28Los Alamos National Laboratory, Los Alamos, NM 87545, USA
29Tokyo Institute of Technology, Tokyo 152-8550, Japan
30Oak Ridge National Laboratory, Physics Division, Oak Ridge, TN 37831-6369, USA
31NCSR Demokritos, GR-15310 Aghia Paraskevi (Athens), Greece
32Dipartimento di Fisica, Università di Bologna, and Sezione INFN di Bologna, I-40126 Bologna, Italy
33Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1184, Japan
34National Technical University of Athens, GR-10682 Athens, Greece
35Faculty of Physics, University of Vienna, A-1010 Vienna, Austria
36Pôle Universitaire Léonard de Vinci, F-92916 Paris La Défense, France
37CEC-JRC-IRMM, B-2440 Geel, Belgium
38Department of Physics and Astronomy, University of Basel, CH-4003 Basel, Switzerland
39ENEA, I-40129 Bologna, Italy
Received 15 December 2009; published 15 July 2010
See accompanying
Physics
Synopsis
The precise determination of the neutron capture cross sections of 186Os and 187Os is important to define the s-process abundance of 187Os at the formation of the solar system. This quantity can be used to evaluate the radiogenic component of the abundance of 187Os due to the decay of the unstable 187Re (t1/2=41.2 Gyr) and from this to infer the time duration of the nucleosynthesis in our galaxy (Re/Os cosmochronometer). The neutron capture cross sections of 186Os, 187Os, and 188Os have been measured at the CERN n_TOF facility from 1 eV to 1 MeV, covering the entire energy range of astrophysical interest. The measurement has been performed by time-of-flight technique using isotopically enriched samples and two C6D6 scintillation detectors for recording the prompt γ rays emitted in the capture events. Maxwellian averaged capture cross sections have been determined for thermal energies between kT=5 and 100 keV corresponding to all possible s-process scenarios. The estimated uncertainties for the values at 30 keV are 4.1, 3.3, and 4.7% for 186Os, 187Os, and 188Os, respectively.
© 2010 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.82.015802
DOI:
10.1103/PhysRevC.82.015802
PACS:
25.40.Lw, 26.20.Kn, 27.70.+q
See Also
See Also:
M. Mosconi, M. Heil, F. Käppeler, R. Plag, and A. Mengoni,
Neutron physics of the Re/Os clock. II. The (n,n′) cross section of 187Os at 30 keV neutron energy,
Phys. Rev. C 82, 015803 (2010).
See Also:
K. Fujii et al. (The n_TOF Collaboration),
Neutron physics of the Re/Os clock. III. Resonance analyses and stellar (n,γ) cross sections of 186,187,188Os,
Phys. Rev. C 82, 015804 (2010).
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