The Os-189(n, gamma) cross section and implications for the duration of stellar nucleosynthesis

Details The Os-189(n, gamma) cross section and implications for the duration of stellar nucleosynthesis The Os-189(n, gamma) cross section and implications for the duration of stellar nucleosynthesis

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...171....9w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 171, no. 1-2, Jan. 1987, p. 9-15.

Physics

7

Absorption Cross Sections, Energy Levels, Nuclear Fusion, Osmium Isotopes, Stellar Physics, Maxwell-Boltzmann Density Function, Radioactive Decay, Rhenium Isotopes, S Waves

Scientific paper

This paper reports the results of a measurement of the 189Os(n,γ) cross sections over the energy ranges 200 - 500 eV and 2.6 - 500 keV. The authors report resonance parameters for the lower energy region and these results yield an observed s-wave mean level spacing D0 = (3.4±0.2) eV, a neutron strength function S0 = (2.9±0.5)×10-4 and an average total radiation width >Γγ< = (83±5) meV. The averaged cross sections over the upper energy range provide constraints on the optical model potential and giant dipole resonance model used top represent the cross section. For astrophysical applications the authors report the 30-keV Maxwellian averaged cross section >σγ< = (1168±47) mb and use the 187Re beta decay to estimate the duration of stellar nucleosynthesis as (11.0±2.5) Gyr.

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