On the validity of the local approximation for the s-process in the OS region, and implications for the (R-187)-(Os-187) cosmochronology

Details On the validity of the local approximation for the s-process in the OS region, and implications for the (R-187)-(Os-187) cosmochronology On the validity of the local approximation for the s-process in the OS region, and implications for the (R-187)-(Os-187) cosmochronology

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137...51a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. 51-57.

Astronomy and Astrophysics

Astrophysics

31

Chemical Evolution, Galactic Evolution, Milky Way Galaxy, Nuclear Fusion, Abundance, Approximation, Electron Capture, Osmium Isotopes, Reaction Kinetics, Rhenium Isotopes

Scientific paper

The s-process number abundance ratio of Os-186 and Os-187, which is of key importance for the (Re-187)-(Os-187) cosmochronology, is calculated in two schematic s-process models. Special emphasis is put on possible s-process path branchings in the W-Os region, as well as on the role of Os-187 electron captures. It is shown that the 'local approximation' commonly called for in the evaluation of the above-mentioned ratio may break down in certain seemingly realistic s-process conditions. This result and the possibly important consequences for the Re-Os chronometry are discussed in combination with the uncertain contribution of the first nuclear excited state of Os-187 to its stellar neutron capture cross section. It is concluded that the relative s-process yields of Os-186 and Os-187 are still uncertain enough for preventing the (Re-187)-(Os-187) pair from being accepted as a reliable cosmochronometer.

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