Phys. Rev. Lett.
93,
161103
(2004)
[5 pages]
Neutron Capture Cross Section Measurement of 151Sm at the CERN Neutron Time of Flight Facility (n_TOF)
U. Abbondanno et al. n_TOF Collaboration
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U. Abbondanno14, G. Aerts7, F. Alvarez-Velarde20, H. Álvarez-Pol24, S. Andriamonje7, J. Andrzejewski33, G. Badurek1, P. Baumann6, F. Bečvář31, J. Benlliure24, E. Berthoumieux7, F. Calviño25, D. Cano-Ott20, R. Capote29, P. Cennini4, V. Chepel17, E. Chiaveri4, N. Colonna13, G. Cortes25, D. Cortina24, A. Couture29, J. Cox29, S. Dababneh8, M. Dahlfors4, S. David5, R. Dolfini15, C. Domingo-Pardo21, I. Duran24, M. Embid-Segura20, L. Ferrant5, A. Ferrari4, R. Ferreira-Marques17, H. Frais-Koelbl3, W. Furman18, I. Goncalves30, R. Gallino36, E. Gonzalez-Romero20, A. Goverdovski19, F. Gramegna12, E. Griesmayer3, F. Gunsing7, B. Haas32, R. Haight27, M. Heil8,*, A. Herrera-Martinez4, S. Isaev5, E. Jericha1, F. Käppeler8, Y. Kadi4, D. Karadimos9, M. Kerveno6, V. Ketlerov19, P. Koehler28, V. Konovalov18, M. Krtička31, C. Lamboudis10, H. Leeb1, A. Lindote17, I. Lopes17, M. Lozano29, S. Lukic6, J. Marganiec33, S. Marrone13, J. Martinez-Val22, P. Mastinu12, A. Mengoni4, P. M. Milazzo14, A. Molina-Coballes21, C. Moreau14, M. Mosconi8, F. Neves17, H. Oberhummer1, S. O’Brien29, J. Pancin7, T. Papaevangelou4, C. Paradela24, A. Pavlik2, P. Pavlopoulos34, J. M. Perlado22, L. Perrot7, M. Pignatari36, R. Plag8, A. Plompen16, A. Plukis7, A. Poch25, A. Policarpo17, C. Pretel25, J. Quesada23, S. Raman28,†, W. Rapp8, T. Rauscher26, R. Reifarth27, M. Rosetti11, C. Rubbia15, G. Rudolf6, P. Rullhusen16, J. Salgado30, J. C. Soares30, C. Stephan5, G. Tagliente13, J. Tain21, L. Tassan-Got5, L. Tavora30, R. Terlizzi13, G. Vannini35, P. Vaz30, A. Ventura11, D. Villamarin20, M. C. Vincente20, V. Vlachoudis4, F. Voss8, H. Wendler4, M. Wiescher29, and K. Wisshak8 (n_TOF Collaboration)
1Atominstitut der Österreichischen Universitäten, Technische Universität Wien, Wien, Austria
2Institut für Isotopenforschung und Kernphysik, Universität Wien, Austria
3Fachhochschule Wiener Neustadt, Wiener Neustadt, Austria
4CERN, Geneva, Switzerland
5Centre National de la Recherche Scientifique/IN2P3-IPN, Orsay, France
6Centre National de la Recherche Scientifique/IN2P3-IReS, Strasbourg, France
7CEA/Saclay-DSM, Gif-sur-Yvette, France
8Institut für Kernphysik, Forschungszentrum Karlsruhe GmbH (FZK), Karlsruhe, Germany
9University of Ioannina, Ioannina, Greece
10Aristotle University of Thessaloniki, Thessaloniki, Greece
11ENEA, Bologna, Italy
12Laboratori Nazionali di Legnaro, Legnaro, Italy
13Istituto Nazionale di Fisica Nucleare, Bari, Italy
14Istituto Nazionale di Fisica Nucleare, Trieste, Italy
15Università degli Studi Pavia, Pavia, Italy
16CEC-JRC-IRMM, Geel, Belgium
17LIP-Coimbra & Departamento de Fisica da Universidade de Coimbra, Coimbra, Portugal
18Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, Dubna, Russia
19Institute of Physics and Power Engineering, Kaluga region, Obninsk, Russia
20Centro de Investigaciones Energeticas Medioambientales y Technologicas, Madrid, Spain
21Consejo Superior de Investigaciones Cientificas, University of Valencia, Valencia, Spain
22Universidad Politecnica de Madrid, Madrid, Spain
23Universidad de Sevilla, Sevilla, Spain
24Universidade de Santiago de Compostela, Santiago de Compostela, Spain
25Universitat Politecnica de Catalunya, Barcelona, Spain
26Department of Physics and Astronomy, University of Basel, Basel, Switzerland
27Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
28Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
29University of Notre Dame, Notre Dame, Indiana 46556, USA
30Instituto Tecnológico e Nuclear, Lisbon, Portugal
31Charles University, Prague, Czech Republic
32Centre National de la Recherche Scientifique/IN2P3-CENBG, Bordeaux, France
33University of Lodz, Lodz, Poland
34Pôle Universitaire Léonard de Vinci, Paris La Défense, France
35Dipartimento di Fisica, Università di Bologna, and Sezione INFN di Bologna, Bologna, Italy
36Dipartimento di Fisica Generale, Università di Torino, and Sezione INFN di Torino, I-10125 Torino, Italy
Received 3 May 2004; published 14 October 2004
The151Sm(n,γ)152Sm cross section has been measured at the spallation neutron facility n_TOF at CERN in the energy range from 1 eV to 1 MeV. The new facility combines excellent resolution in neutron time-of-flight, low repetition rates, and an unsurpassed instantaneous luminosity, resulting in rather favorable signal/background ratios. The 151Sm cross section is of importance for characterizing neutron capture nucleosynthesis in asymptotic giant branch stars. At a thermal energy of kT=30 keV the Maxwellian averaged cross section of this unstable isotope (t1/2=93 yr) was determined to be 3100±160 mb, significantly larger than theoretical predictions.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.161103
DOI:
10.1103/PhysRevLett.93.161103
PACS:
25.40.Lw, 26.20.+f, 27.70.+q, 97.10.Cv
*Corresponding author at Institut für Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Germany. Electronic address: michael.heil@ik.fzk.de †Deceased.
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