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Neutron reactions and nuclear cosmo-chronology

Mosconi, M. and Heil, M. and Kappeler, F. and Mengoni, A. and Plag, R. and Fujii, K. and Gallino, R. and Aerts, G. and Terlizzi, R. and Abbondanno, U. and Alvarez-Pol, H. and Alvarez-Velarde, F. and Andriamonje, S. and Andrzejewski, J. and Assimakopoulos, P. and Audouin, L. and Badurek, G. and Baumann, P. and Bevcar, F. and Berthoumieux, E. and Bisterzo, S. and Calvino, F. and Cano-Ott, D. and Capote, R. and de Albornoz, A. Carrillo and Cennini, P. and Chepel, V. and Chiaveri, E. and Colonna, N. and CorteS, G. and Couture, A. and Cox, J. and Dahlfors, M. and David, S. and Dillman, I. and Dolfini, R. and Pardo, C. Domingo and Dridi, W. and Duran, I. and Eleftheriadis, C. and Embid-Segura, M. and Ferrant, L. and Ferrari, A. and Ferreira-Marques, R. and Fitzpatrick, L. and Frais-Koelbl, H. and Furman, W. and Goncalves, I. and Gonzalez-Romero, E. and Goverdovski, A. and Gramegna, F. and Griesmayer, E. and Guerrero, C. and Gunsing, F. and Haas, B. and Haight, R. and Herrera-Martinez, A. and Igashira, M. and Isaev, S. and Jericha, E. and Kadi, Y. and Karamanis, D. and Karadimos, D. and Kerveno, M. and Ketlerov, V. and Koehler, P. and Konovalov, V. 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 Marques, L. and Marrone, S. and Mastinu, P. and Milazzo, P. M. and Moreau, C. and Neves, F. and Oberhummer, H. and Oshima, M. 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 Plompen, A. and Plukis, A. and Poch, A. and Pretel, C. and Quesada, J. and Rauscher, T. and Reifarth, R. and Rosetti, M. and Rubbia, C. and Rudolf, G. and Rullhusen, P. and Salgado, J. 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 Wendler, H. and Wisshak, M. Wiescher K.. (2007) Neutron reactions and nuclear cosmo-chronology. In: Progress in particle and nuclear physics, Vol. 59, No. 1. Oxford, pp. 165-173.

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Official URL: http://edoc.unibas.ch/dok/A5253883

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Abstract

The beta-decay of Re-187 (t(1/2) = 42.3 Gyr) represents a suited cosmo-chronometer for the age of the r-process abundances, since the radiogenic part of the daughter isotope (OS)-O-187 is defined by the difference between the solar Os-187 abundance and s-process contribution to Os-187. The latter component can be determined via the s-process systematics based on the stellar neutron capture cross sections of Os-186 and Os-187. The laboratory cross section of Os-187 requires a significant correction for the effect of the low-lying excited state at 9.75 keV, which is strongly populated under stellar conditions. This theoretical correction can be improved by an experimental cross section for inelastic scattering to the 9.75 keV state. High resolution time-of-flight measurements of (n, gamma) cross sections of (OS)-O-186,187,188 from I eV to I MeV at CERN n-TOF facility are reported. The inferred stellar cross sections differ from previously recommended values. In addition, the inelastic scattering cross section has been measured at 30 keV neutron energy via time-of-flight at the Karlsruhe 3.7 MV Van de Graaff. 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:Conference or Workshop Item, refereed
Conference or workshop item Subtype:Conference Paper
Bibsysno:Link to catalogue
Publisher:Pergamon Press
Note:Publication type according to Uni Basel Research Database: Conference paper
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Last Modified:22 Mar 2012 14:27
Deposited On:22 Mar 2012 13:56

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