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Capture cross section measurements of ¹⁸⁶Os,¹⁸⁷Os,¹⁸⁸Os at n_TOF : the resolved resonance region

Fujii, K. and Mosconi, M. and Milazzo, P. M. and Domingo-Pardo, C. and Kaeppeler, F. and Mengoni, A. and Abbondanno, U. and Aerts, G. 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 Chiaveri, E. 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 Heil, M. 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 Lampoudis, C. and Leeb, H. and Lindote, A. and Lopes, I. and Lozano, M. and Lukic, S. and Marganiec, J. and Marrone, S. and Martinez, T. and Massimi, C. and Mastinu, P. and Moreau, C. 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 Plag, R. and Plompen, A. and Plukis, A. and Poch, A. and Praena, J. 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 Terlizzi, R. 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) Capture cross section measurements of ¹⁸⁶Os,¹⁸⁷Os,¹⁸⁸Os at n_TOF : the resolved resonance region. In: International Conference on Nuclear Data for Science and Technology, Vol. 1. [Les Ulis], pp. 599-602.

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Official URL: http://edoc.unibas.ch/dok/A5253925

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Abstract

The neutron capture cross sections of Os-186,Os-187,Os-188 have been measured at the CERN neutron time-of-flight facility, n_TOF, in the neutron energy range from 1 eV up to 1 MeV. In this contribution, we report the results of the analysis of the resolved resonance region (RRR). Resonance parameters have been extracted from a full R-matrix fit of the capture yields with the SAMMY code. A statistical analysis has been performed and the related average resonance parameters are derived. This information is crucial for a complete understanding and modeling in terms of the Hauser-Feshbach statistical model of the capture and inelastic reaction channels, required for the evaluation of the stellar reaction rates of these isotopes. Maxwellian average cross sections for the range of temperatures relevant for s-process nucleosynthesis have been derived from the combined information of the experimental data in the resolved and unresolved resonance regions. A brief account of the implications of this analysis in the estimation of the s-process component of the Os-187 abundance and the related impact on the estimates of the time-duration of the galactic nucleosynthesis through the Re/Os clock is given.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Conference or Workshop Item
Conference or workshop item Subtype:Conference Paper
Bibsysno:Link to catalogue
Publisher:EDP sciences
Note:Publication type according to Uni Basel Research Database: Conference paper
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Last Modified:04 Sep 2015 14:31
Deposited On:22 Mar 2012 13:56

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