학술논문
Neutron Capture Cross Sections for the Re/Os Clock.
Document Type
Article
Author
Cano-Ott, D.; Aerts, G.; Abbondanno, U.; Álvarez, H.; Alvarez-Velarde, F.; Andriamonje, S.; Andrzejewski, J.; Assimakopoulos, P.; Audouin, L.; Badurek, G.; Baumann, P.; Bečvář, F.; Benlliure, J.; Berthoumieux, E.; Calviño, F.; Capote, R.; de Albornoz, A. Carrillo; Cennini, P.; Chepel, V.; Chiaveri, E.
Source
Subject
*NEUTRON capture
*NUCLEAR reactions
*RHENIUM isotopes
*OSMIUM isotopes
*RADIOGENETICS
*NUCLEAR physics
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Language
ISSN
0094-243X
Abstract
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 σN 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. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]