Neutron Capture Cross Sections for the Re/Os Clock

M. Mosconi , A. Mengoni , M. Heil , F. Käppeler , G. Aerts , R. Terlizzi , W. Furman , V. Ketlerov , A. Goverdovski , V. Konovalov , U. Abbondanno , H. Álvarez , F. Alvarez-Velarde , S. Andriamonje , J. Andrzejewski , P. Assimakopoulos , L. Audouin (1) , G. Badurek , P. Baumann (2) , F. Becvár , J. Benlliure , E. Berthoumieux , F. Calviño , D. Cano-Ott , R. Capote , A. Carrillo de Albornoz , P. Cennini , V. Chepel , E. Chiaveri , N. Colonna , G. Cortes , D. Cortina , A. Couture , J. Cox , S. David (1) , R. Dolfini , C. Domingo-Pardo , W. Dridi , I. Duran , M. Embid-Segura , L. Ferrant (1) , Anthony Ferrari , R. Ferreira-Marques , L. Fitzpatrick , H. Frais-Kölbl , K. Fujii , C. Guerrero , I. Goncalves , R. Gallino , E. Gonzalez-Romero , F. Gramegna , E. Griesmayer , F. Gunsing , B. Haas (3) , R. Haight , A. Herrera-Martinez , M. Igashira , S. Isaev (1) , E. Jericha , Y. Kadi , D. Karamanis , D. Karadimos , M. Kerveno (2) , P. Koehler , D. Kolokolov , E. Kossionides , M. Krticka , C. Lamboudis , H. Leeb , A. Lindote , I. Lopes , M. Lozano , S. Lukic (2) , J. Marganiec , L. Marques , S. Marrone , P. Mastinu , P. M. Milazzo , C. Moreau , F. Neves , H. Oberhummer , S. O'Brien , M. Oshima , J. Pancin , C. Papachristodoulou , C. Papadopoulos , C. Paradela , N. Patronis , A. Pavlik , P. Pavlopoulos , L. Perrot , R. Plag , A. Plompen , A. Plukis , A. Poch , C. Pretel , J. Quesada , T. Rauscher , R. Reifarth , M. Rosetti , C. Rubbia , G. Rudolf (2) , P. Rullhusen , J. Salgado , L. Sarchiapone , C. Stephan (1) , G. Tagliente , J. L. Tain , L. Tassan-Got (1) , L. Tavora , G. Vannini , P. Vaz , A. Ventura , D. Villamarin , M. C. Vincente , V. Vlachoudis , R. Vlastou , F. Voss , H. Wendler , M. Wiescher , K. Wisshak

1 IPNO - Institut de Physique Nucléaire d'Orsay
2 IReS - Institut de Recherches Subatomiques
3 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan

The radioactive decay of 187Re --> 187Os (t1/2 = 43 Gyr) is suited for dating the onset of heavy-element nucleosynthesis. The radiogenic contribution to the 187Os abundance is the difference between the natural abundance and the corresponding s-process component. This component can be obtained via the well-established sigmaN systematics using the neighboring s-only isotope 186Os, 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 C6D6 detector array at the n_TOF neutron spallation facility of CERN. The capture cross sections of 186Os, 187Os, and 188Os 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

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

M. Mosconi, A. Mengoni, M. Heil, F. Käppeler, G. Aerts, et al.. Neutron Capture Cross Sections for the Re/Os Clock. International Conference on Nuclear Data for Science and Technology, Sep 2004, Santa Fe, United States. pp.1335-1338, ⟨10.1063/1.1945252⟩. ⟨in2p3-00025891⟩