Neutron Capture Cross Sections for the Re/Os Clock
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en
Communication dans un congrès
Ce document a été publié dans
Proceedings of the International Conference on Nuclear Data for Science and Technology, Proceedings of the International Conference on Nuclear Data for Science and Technology, 2004-09-26, Santa Fe. 2005, vol. 769, n° 769, p. 1335-1338
American Institute of Physics
Résumé en anglais
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 ...Lire la suite >
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< Réduire
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