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        Improved lead and bismuth (n,gamma) cross sections and their astrophysical impact

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        ndata07493.pdf (PDF, 155Kb)
        Author
        Domingo-Pardo, C.
        Abbondanno, U.
        Aerts, G.
        Alvarez, H.
        Alvarez-Velarde, F.
        Andriamonje, S.
        Andrzejewski, J.
        Assimakopoulos, P.
        Audouin, L.
        Badurek, G.
        Baumann, P.
        Becvar, F.
        Berthoumieux, E.
        Calvino, F.
        Calviani, M.
        Cano-Ott, D.
        Capote, R.
        Carrapico, C.
        Cennini, P.
        Chepel, V.
        Chiaveri, E.
        Colonna, N.
        Cortes, G.
        Couture, A.
        Cox, J.
        Dahlfors, M.
        David, S.
        Dillmann, I.
        Dridi, W.
        Duran, I.
        Eleftheriadis, C.
        Embid-Segura, M.
        Ferrant, L.
        Ferrari, A.
        Ferreira-Marques, R.
        Fujii, K.
        Furman, W.
        Goncalves, I.
        Gonzalez-Romero, E.
        Gramegna, F.
        Guerrero, C.
        Gunsing, F.
        Haas, B.
        Haight, R.
        Heil, M.
        Herrera-Martinez, A.
        Igashira, M.
        Jericha, E.
        Kaeppeler, F.
        Rauscher, T.
        n TOF Collaboration
        Attention
        2299/15279
        Abstract
        A series of (n,gamma) neutron capture measurements on the lead isotopes and bismuth have been carried Out at the CERN n_TOF installation in the neutron energy range from 1 eV up to 1 MeV. At n_TOF, contaminations due to scattered neutrons were reduced down to a negligible level by using improved gamma-ray detectors with very low neutron sensitivity. The background level has been determined precisely from a complementary measurement. Other experimental effects related to the electronic threshold in the detectors and the angular distribution of the prompt gamma-rays were investigated via Monte Carlo simulations and could be taken in account in the analysis of the capture data. With this set of measurements the energy differential (n,gamma) cross sections of (204,206,207)Pb and (209)Bi have been determined with good accuracy. The information obtained in this work becomes of interest for constraining r-process calculations and in particular for the Th/U cosmochronometer.
        Publication date
        2008
        Published in
        Procs Int Conf on Nuclear Data for Science and Technology
        Published version
        https://doi.org/10.1051/ndata:07493
        Other links
        http://hdl.handle.net/2299/15279
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