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

K. Fujii, M. Mosconi, P. M. Milazzo, C. Domingo-Pardo, F. Kaeppeler, A. Mengoni, U. Abbondanno, G. Aerts, H. Alvarez, F. Alvarez-Velarde, S. Andriamonje, J. Andrzejewski, P. Assimakopoulos, L. Audouin, G. Badurek, P. Baumann, F. Becvar, E. Berthoumieux, F. Calvino, M. CalvianiD. Cano-Ott, R. Capote, C. Carrapico, P. Cennini, V. Chepel, E. Chiaveri, N. Colonna, G. Cortes, A. Couture, J. Cox, M. Dahlfors, S. David, I. Dillmann, W. Dridi, I. Duran, C. Eleftheriadis, M. Embid-Segura, L. Ferrant, A. Ferrari, R. Ferreira-Marques, W. Furman, I. Goncalves, E. Gonzalez-Romero, F. Gramegna, C. Guerrero, F. Gunsing, B. Haas, R. Haight, M. Heil, T. Rauscher, n TOF Collaboration

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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The neutron capture cross sections of (186,187,188)Os 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 (187)Os abundance and the related impact on the estimates of the time-duration of the galactic nucleosynthesis through the Re/Os clock is given.

Original languageEnglish
Title of host publicationInt Conf on Nuclear Data for Science and Technology
EditorsO. Bersillon, F. Gunsing, E. Bauge, R. Jacqmin, S. Leray
Place of PublicationCEDEX A
PublisherEDP Sciences
Number of pages4
ISBN (Print)978-2-7598-0090-2
Publication statusPublished - 2008
EventInternational Conference on Nuclear Data for Science and Technology - Nice, France
Duration: 22 Apr 200727 Apr 2007


ConferenceInternational Conference on Nuclear Data for Science and Technology


  • CERN


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