Neutron capture cross sections for the Re/Os clock
Author
Mosconi, M.
Mengoni, A.
Heil, M.
Kappeler, F.
Aerts, G.
Terlizzi, R.
Abbondanno, U.
Alvarez, H.
Alvarez-Velarde, F.
Andriamojie, S.
Andrzejewski, J.
Assimakopoulos, R.
Audouin, L.
Badurek, G.
Baumann, P.
Becvar, F.
Benlliure, J.
Berthoumieux, E.
Calvino, F.
Cano-Ott, D.
Capote, R.
de Albornoz, A.C.
Cennini, R.
Chiaveri, E.
Colonna, N.
Cortes, G.
Cortina, D.
Couture, A.
Cox, J.
David, S.
Dolfini, R.
Domingo-Pardo, C.
Dridi, W.
Duran, R.B.
Embid-Segura, M.
Ferrant, L.
Ferrari, A.
Fitzpatrick, L.
Ferreira-Marques, R.
Frais-Kolbl, H.
Fujii, K.
Furman, W.
Guerrero, C.
Goncalves, I. F.
Gallino, R.
Gonzalez-Romero, E.
Goverdovski, A.
Gramegna, F.
Griesmayer, E.
Gunsing, F.
Haas, B.
Haight, R.
Herrera-Martinez, A.
Igashira, M.
Isaev, S.
Jericha, E.
Kadi, Y.
Karamanis, D.
Karadimos, D.
Kerveno, M.
Ketlerov, V.
Koehler, R.
Konovalov, V.
Kossionides, E.
Krticka, M.
Lamboudis, C.
Leeb, H.
Lindote, A.
Lopes, I.
Lozano, M.
Lukic, S.
Marganiec, J.
Marques, L.
Martone, S.
Mastinu, R.
Milazzo, R.
Moreau, C.
Neves, F.
Oberhummer, H.
O'Brien, S.
Oshima, M.
Pancin, J.
Papachristodoulou, C.
Papadopoulos, C.
Paradela, C.
Patronis, N.
Pavlik, A.
Pavlopoulos, R.
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, R.
Salgado, J.
Sarchiapone, L.
Stephan, C.
Tagliente, G.
Tain, J. L.
Tassan-Got, L.
Tavora, L.
Vannini, G.
Vaz, R.
Ventura, A.
Villamarin, D.
Vincente, M. C.
Vlachoudis, V.
Vlastou, R.
Voss, F.
Wendle, H.
Wiescher, Michael
Wisshak, K.
Attention
2299/14875
Abstract
The radioactive decay of (187)Re -> (187)Os (t(1/2) = 43 Gyr) is suited for dating the onset of heavy-element nucleosynthesis. The radiogenic contribution to the (187)Os abundance is the difference between the natural abundance and the corresponding s-process component. This component can be obtained via the well-established sigma N systematics using the neighboring s-only isotope (186)Os, provided the neutron-capture cross sections of both isotopes are known with sufficient accuracy. We report on a new set of experiments performed with a C(6)D(6) detector array at the n_TOF neutron spallation facility of CERN. The capture cross sections of (186)Os, (187)Os, and (188)Os have been measured in the neutron-energy range between 1 eV and 1 MeV, and Maxwellian-averaged cross sections were deduced for the relevant thermal energies from kT = 5 keV to 100 keV.