Nuclear physics for the Re/Os clock

doi:10.1088/0954-3899/35/1/014015

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Journal of Physics G: Nuclear and Particle Physics

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Journal of Physics G: Nuclear and Particle Physics Volume 35 Number 1 Create an alert RSS this journal

M Mosconi et al 2008 J. Phys. G: Nucl. Part. Phys. 35 014015 doi:10.1088/0954-3899/35/1/014015

Nuclear physics for the Re/Os clock

M Mosconi¹, M Heil^1,11, F Käppeler¹, R Plag¹, A Mengoni^2,3, K Fujii⁴, C Domingo-Pardo¹, G Aerts⁵, R Terlizzi⁶, R Gallino⁷, U Abbondanno⁴, H Álvarez⁸, F Alvarez-Velarde⁹, S Andriamonje⁵, J Andrzejewski¹⁰, P Assimakopoulos¹¹, L Audouin⁵, G Badurek¹², P Baumann¹³, F Bečvář¹⁴, E Berthoumieux⁵, F Calviño¹⁵, M Calviani¹⁶, D Cano-Ott⁹, R Capote^2,17, C Carrapiço¹⁸, P Cennini³, V Chepel¹⁹, N Colonna⁶, G Cortes²⁰, A Couture²¹, J Cox²¹, M Dahlfors³, S David¹³, I Dillmann¹, W Dridi⁵, I Duran⁸, C Eleftheriadis²², M Embid-Segura⁹, L Ferrant²³, A Ferrari³, R Ferreira-Marques¹⁹, W Furman²⁴, I Goncalves¹⁹, E Gonzalez-Romero⁹, F Gramegna¹⁶, C Guerrero⁹, F Gunsing⁵, B Haas²⁵, R Haight²⁶, A Herrera-Martinez³, M Igashira²⁷, E Jericha¹², Y Kadi³, D Karadimos¹¹, D Karamanis¹¹, M Kerveno¹³, P Koehler²⁸, E Kossionides²⁹, M Krtička¹⁴, C Lamboudis²², H Leeb¹², A Lindote¹⁹, I Lopes¹⁹, M Lozano¹⁷, S Lukic¹³, J Marganiec¹⁰, S Marrone⁶, C Massimi³⁰, P Mastinu¹⁶, P M Milazzo⁴, F Neves¹⁹, H Oberhummer¹², S O'Brien²¹, J Pancin⁵, C Papachristodoulou¹¹, C Papadopoulos³¹, C Paradela⁸, N Patronis¹¹, A Pavlik¹³, P Pavlopoulos³², L Perrot⁵, M T Pigni¹², A Plompen³³, A Plukis⁵, A Poch²⁰, C Pretel²⁰, J Quesada¹⁷, T Rauscher³⁴, R Reifarth²⁶, C Rubbia³⁵, G Rudolf¹³, P Rullhusen³³, J Salgado¹⁸, C Santos¹⁸, L Sarchiapone³, I Savvidis²², C Stephan²³, G Tagliente⁶, J L Tain³⁶, L Tassan-Got²³, L Tavora¹⁸, G Vannini³⁰, P Vaz¹⁸, A Ventura³⁷, D Villamarin⁹, M C Vincente⁹, V Vlachoudis³, R Vlastou³¹, F Voss¹, S Walter¹, M Wiescher²¹ and K Wisshak¹ (The n_TOF Collaboration)

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marita.mosconi@ik.fzk.de

¹ Forschungszentrum Karlsruhe GmbH (FZK), Institut für Kernphysik, Germany
Gesellschaft für Schwerionenforschung mbH, Darmstadt, Germany
² International Atomic Energy Agency (IAEA), NAPC/Nuclear Data Section, Vienna, Austria
³ CERN, Geneva, Switzerland
⁴ Istituto Nazionale di Fisica Nucleare (INFN), Trieste, Italy
⁵ CEA/Saclay—DSM/DAPNIA, Gif-sur-Yvette, France
⁶ Istituto Nazionale di Fisica Nucleare (INFN), Bari, Italy
⁷ Università degli studi di Torino, Torino, Italy
⁸ Universidade de Santiago de Compostela, Spain
⁹ Centro de Investigaciones Energeticas Medioambientales y Tecnologicas, Madrid, Spain
¹⁰ University of Lodz, Lodz, Poland
¹¹ University of Ioannina, Greece
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 Universitat Politecnica de Catalunya, Barcelona, Spain
¹⁶ Istituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali di Legnaro, Italy
¹⁷ Universidad de Sevilla, Spain
¹⁸ Instituto Tecnológico e Nuclear (ITN), Lisbon, Portugal
¹⁹ LIP—Coimbra and Departamento de Fisica da Universidade de Coimbra, Portugal
²⁰ Universitat Politecnica de Catalunya, Barcelona, Spain
²¹ University of Notre Dame, Notre Dame, IN 46556, USA
²² Aristotle University of Thessaloniki, Greece
²³ Centre National de la Recherche Scientifique/IN2P3—IPN, Orsay, France
²⁴ Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, Dubna, Russia
²⁵ Centre National de la Recherche Scientifique/IN2P3—CENBG, Bordeaux, France
²⁶ Los Alamos National Laboratory, NM 87545, USA
²⁷ Tokyo Institute of Technology, Tokyo, Japan
²⁸ Oak Ridge National Laboratory, Physics Division, Oak Ridge, TN 37831, USA
²⁹ NCSR, Athens, Greece
³⁰ Dipartimento di Fisica, Università di Bologna, and Sezione INFN di Bologna, Italy
³¹ National Technical University of Athens, Greece
³² Pôle Universitaire Léonard de Vinci, Paris La Défense, France
³³ CEC-JRC-IRMM, Geel, Belgium
³⁴ Department of Physics and Astronomy, University of Basel, Basel, Switzerland
³⁵ Università degli Studi di Pavia, Pavia, Italy
³⁶ Instituto de Física Corpuscular, CSIC-Universidad de Valencia, Spain
³⁷ ENEA, Bologna, Italy

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Abstract References Cited By

Dating the age of the universe by the β-decay of ¹⁸⁷Re (t_1/2 = 41.2 Gyr) requires the accurate assessment of the s-process reaction flow. The daughter nucleus ¹⁸⁷Os as well as its immediate s-only neighbor ¹⁸⁶Os are shielded from the r-process. Therefore, the radiogenic contribution to ¹⁸⁷Os can be derived via the local approximation of the s-process, which is well justified in this mass region: ( lang σ rang N_s)₁₈₇ = ( lang σ rang N_s)₁₈₆. Accordingly, accurate Maxwellian-averaged (n, γ) cross sections have to be known for ¹⁸⁶Os and ¹⁸⁷Os over the full range of s-process temperatures. Because ¹⁸⁷Os has low-lying excited states, which are significantly populated during the s-process, neutron captures on these excited states have to be properly taken into account. The input for the corresponding Hauser–Feshbach calculations can be constrained by deriving the strength functions from a detailed resonance analysis of the measured (n, γ) cross sections as well as by an additional measurement of the inelastic scattering cross section for the first exited level, which dominates the competition between the capture and scattering channels. This contribution reports on measurements of the neutron capture cross sections of ¹⁸⁶Os, ¹⁸⁷Os and ¹⁸⁸Os from the eV region to 1 MeV at the CERN/n_TOF facility and of the inelastic scattering cross section of ¹⁸⁷Os around 30 keV at the Karlsruhe 3.7 MV Van de Graaff accelerator. Based on these results and on a detailed resonance analysis, improved Maxwellian-averaged cross sections were obtained for thermal energies between 5 keV and 100 keV. The implications of these results for the Re/Os clock are discussed.

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