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        New measurement of neutron capture resonances in Bi-209

        Author
        Domingo-Pardo, C.
        Abbondanno, U.
        Aerts, G.
        Alvarez-Pol, H.
        Alvarez-Velarde, F.
        Andriamonje, S.
        Andrzejewski, J.
        Assimakopoulos, P.
        Audouin, L.
        Badurek, G.
        Baumann, P.
        Becvar, F.
        Berthoumieux, E.
        Calvino, F.
        Cano-Ott, D.
        Capote, R.
        de Albornoz, A. Carrillo
        Cennini, P.
        Chepel, V.
        Chiaveri, E.
        Colonna, N.
        Cortes, G.
        Couture, A.
        Cox, J.
        Dahlfors, M.
        David, S.
        Dillman, I.
        Dolfini, R.
        Dridi, W.
        Duran, I.
        Eleftheriadis, C.
        Embid-Segura, M.
        Ferrant, L.
        Ferrari, A.
        Ferreira-Marques, R.
        Fitzpatrick, L.
        Frais-Koelbl, H.
        Fujii, K.
        Furman, W.
        Gallino, R.
        Goncalves, I.
        Gonzalez-Romero, E.
        Goverdovski, A.
        Gramegna, F.
        Griesmayer, E.
        Guerrero, C.
        Gunsing, F.
        Haas, B.
        Haight, R.
        Heil, M.
        Herrera-Martinez, A.
        Igashira, M.
        Isaev, S.
        Jericha, E.
        Kadi, Y.
        Kappeler, F.
        Karamanis, D.
        Karadimos, D.
        Kerveno, M.
        Ketlerov, V.
        Koehler, P.
        Konovalov, V.
        Kossionides, E.
        Krticka, M.
        Lamboudis, C.
        Leeb, H.
        Lindote, A.
        Lopes, I.
        Lozano, M.
        Lukic, S.
        Marganiec, J.
        Marques, L.
        Marrone, S.
        Mastinu, P.
        Mengoni, A.
        Milazzo, P. M.
        Moreau, C.
        Mosconi, M.
        Neves, F.
        Oberhummer, H.
        Oshima, M.
        O'Brien, S.
        Pancin, J.
        Papachristodoulou, C.
        Papadopoulos, C.
        Paradela, C.
        Patronis, N.
        Pavlik, A.
        Pavlopoulos, P.
        Perrot, L.
        Plag, R.
        Plompen, A.
        Plukis, A.
        Poch, A.
        Pretel, C.
        Quesada, J.
        Rauscher, T.
        Reifarth, R.
        Rosetti, M.
        Rubbia, C.
        Rudolf, G.
        Rullhusen, P.
        Salgado, J.
        Sarchiapone, L.
        Savvidis, I.
        Stephan, C.
        Tagliente, G.
        Tain, J. L.
        Tassan-Got, L.
        Tavora, L.
        Terlizzi, R.
        Vannini, G.
        Vaz, P.
        Ventura, A.
        Villamarin, D.
        Vincente, M. C.
        Vlachoudis, V.
        Vlastou, R.
        Voss, F.
        Walter, S.
        Wendler, H.
        Wiescher, M.
        Wisshak, K.
        Attention
        2299/12388
        Abstract
        The neutron capture cross section of Bi-209 has been measured at the CERN n_TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of gamma-rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. gamma-Ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because Bi-209 is the last stable isotope in the reaction path of the stellar s-process, the Maxwellian averaged capture cross section is important for the recycling of the reaction flow by alpha decays. In the relevant stellar range of thermal energies between kT=5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars. With the improved set of cross sections we obtain an s-process fraction of 19 +/- 3% of the solar bismuth abundance, resulting in an r-process residual of 81 +/- 3%. The present (n,gamma) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target.
        Publication date
        2006-08
        Published in
        Physical Review C (nuclear physics)
        Published version
        https://doi.org/10.1103/PhysRevC.74.025807
        Other links
        http://hdl.handle.net/2299/12388
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