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Registro de acceso cerrado Neutron reactions and nuclear cosmo-chronology

Autor :Mosconi, M.
Heil, M.
Kappeler, F.
Mengoni, A.
Plag, R.
Fujii, K.
Gallino, R.
Aerts, G.
Terlizzi, R.
Abbondanno, U.
Álvarez-Pol, H.
Voss, F.
Andriamonje, S.
Walter, S.
Wendler, H.
Wisshak, M. W. K.
Andrzejewski, J.
Assimakopoulos, P.
Audouin, L.
Badurek, G.
Baumann, P.
Cox, J.
Bevcar, F.
Berthoumieux, E.
Bisterzo, S.
Calvino, F.
Cano Ott, Daniel
Capote, R.
Albornoz, A. C. de
Cennini, P.
Chepel, V.
Chiaveri, E.
Dahlfors, M.
Colonna, N.
Cortés, G.
Couture, A.
n_TOF Collaboration
David, S.
Dillman, I.
Dolfini, R.
Pardo, C. D.
Dridi, W.
Duran, I.
Eleftheriadis, C.
Embid-Segura, M.
Haas, B.
Ferrant, L.
Ferrari, A.
Ferreira-Marques, R.
Fitzpatrick, L.
Frais-Koelbl, H.
Furman, W.
Goncalves, I.
González-Romero, E.
Goverdovski, A.
Gramegna, F.
Haight, R.
Griesmayer, E.
Guerrero, C.
Gunsing, F.
Herrera-Martínez, A.
Igashira, M.
Isaev, S.
Jericha, E.
Kadi, Y.
Karamanis, D.
Karadimos, D.
Kerveno, M.
Marrone, S.
Ketlerov, V.
Koehler, P.
Konovalov, V.
Kossionides, E.
Krticka, M.
Lamboudis, C.
Leeb, H.
Lindote, A.
Lopes, I.
Lozano, M.
Mastinu, P.
Lukic, S.
Marganiec, J.
Marques, L.
Milazzo, P. M.
Moreau, C.
Neves, F.
Oberhummer, H.
Oshima, M.
O'Brien, S.
Pancin, J.
Papachristodoulou, C.
Rosetti, M.
Papadopoulos, C.
Paradela, C.
Patronis, N.
Pavlik, A.
Pavlopoulos, P.
Perrot, L.
Plompen, A.
Plukis, A.
Poch, A.
Pretel, C.
Rubbia, C.
Quesada, J.
Rauscher, T.
Reifarth, R.
Rudolf, G.
Rullhusen, P.
Salgado, J.
Sarchiapone, L.
Savvidis, I.
Stephan, C.
Tagliente, G.
Taín, José Luis
Álvarez-Velarde, F.
Tassan-Got, L.
Tavora, L.
Vannini, G.
Vaz, P.
Ventura, A.
Villamarin, D.
Vincente, M. C.
Vlachoudis, V.
Vlastou, R.
Palabras clave :Re/Os cosmo-chronometer, s-process, Stellar cross sections, Neutron capture, Inelastic scattering
Fecha de publicación :7-ene-2007
Editor:Elsevier
Citación :Progress in Particle and Nuclear Physics Vol 59(1): 165-173 (2007)
Resumen :The β-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-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, γ) cross sections of Os-186,187,188 from 1 eV to 1 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.
Descripción :9 pages, 3 figures.-- ISI Article Identifier: 000248204700016
Printed version published Jul 2007.-- Issue title: International Workshop on Nuclear Physics 28th Course - Radioactive Beams, Nuclear Dynamics and Astrophysics, Ettore Majorana Center for Scientific Culture (Erice, Sicily, Italy, Sep 16-24, 2006).
URI :http://hdl.handle.net/10261/9168
ISSN:0146-6410
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