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Nuclear physics for the Re/Os clock

Mosconi, M. and Heil, M. and Kaeppeler, F. and Plag, R. and Mengoni, A. and Fujii, K. and Domingo-Pardo, C. and Aerts, G. and Terlizzi, R. and Gallino, R. and Abbondanno, U. and Alvarez, H. and Alvarez-Velarde, F. and Andriamonje, S. and Andrzejewski, J. and Assimakopoulos, P. and Audouin, L. and Badurek, G. and Baumann, P. and Becvar, F. and Berthoumieux, E. and Calvino, F. and Calviani, M. and Cano-Ott, D. and Capote, R. and Carrapico, C. and Cennini, P. and Chepel, V. and Colonna, N. and Cortes, G. and Couture, A. and Cox, J. and Dahlfors, M. and David, S. and Dillmann, I. and Dridi, W. and Duran, I. and Eleftheriadis, C. and Embid-Segura, M. and Ferrant, L. and Ferrari, A. and Ferreira-Marques, R. and Furman, W. and Goncalves, I. and Gonzalez-Romero, E. and Gramegna, F. and Guerrero, C. and Gunsing, F. and Haas, B. and Haight, R. and Herrera-Martinez, A. and Igashira, M. and Jericha, E. and Kadi, Y. and Karadimos, D. and Karamanis, D. and Kerveno, M. and Koehler, P. and Kossionides, E. and Krticka, M. and Lamboudis, C. and Leeb, H. and Lindote, A. and Lopes, I. and Lozano, M. and Lukic, S. and Marganiec, J. and Marrone, S. and Massimi, C. and Mastinu, P. and Milazzo, P. M. and Neves, F. and Oberhummer, H. and O`Brien, S. and Pancin, J. and Papachristodoulou, C. and Papadopoulos, C. and Paradela, C. and Patronis, N. and Pavlik, A. and Pavlopoulos, P. and Perrot, L. and Pigni, M. T. and Plompen, A. and Plukis, A. and Poch, A. and Pretel, C. and Quesada, J. and Rauscher, T. and Reifarth, R. and Rubbia, C. and Rudolf, G. and Rullhusen, P. and Salgado, J. and Santos, C. and Sarchiapone, L. and Savvidis, I. and Stephan, C. and Tagliente, G. and Tain, J. L. and Tassan-Got, L. and Tavora, L. and Vannini, G. and Vaz, P. and Ventura, A. and Villamarin, D. and Vincente, M. C. and Vlachoudis, V. and Vlastou, R. and Voss, F. and Walter, S. and Wiescher, M. and Wisshak, K.. (2008) Nuclear physics for the Re/Os clock. Journal of physics. G, Nuclear and particle physics, Vol. 35, H. 1 , 014015l, 7 S..

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Official URL: http://edoc.unibas.ch/dok/A5253875

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Abstract

Dating the age of the universe by the beta-decay of Re-187 (t(1/2) = 41.2 Gyr) requires the accurate assessment of the s-process reaction flow. The daughter nucleus Os-187 as well as its immediate s-only neighbor Os-186 are shielded from the r-process. Therefore, the radiogenic contribution to Os-187 can be derived via the local approximation of the s-process, which is well justified in this mass region: ( N-s)(187) = ( N-s)(186). Accordingly, accurate Maxwellian-averaged (n,gamma) cross sections have to be known for Os-186 and Os-187 over the full range of s-process temperatures. Because Os-187 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,gamma) 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 Os-186, Os-187 and Os-188 from the eV region to 1MeV at the CERN/n_TOF facility and of the inelastic scattering cross section of Os-187 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:IOP Publ.
ISSN:0954-3899
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:25
Deposited On:22 Mar 2012 13:46

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