Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..208h&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Astronomy and Astrophysics
Astronomy
Scientific paper
A 187Os-187Re pair has been known to be a good cosmochronometer for the r-process nucleosynthesis. The radioactivity 187Re decays to a daughter nucleus 187Os with a half-life of 2.0 × 105 years. The 187Re has been considered to be synthesized predominantly by the r-process, whereas the 187Os has been produced by both the radioactive decay of 187Re and the s-process nucleosynthesis. The s-process contaminations to 187Re and 187Os must be subtracted for an estimation of the passing time from a r-process episode to the present time with an accuracy. An s-process path through a 186Re isomer has been ignored up to now because the neutron capture cross section of the 185Re(n,γ)186mRe reaction at a thermal energy as well as a quasi-stellar energy has not been measured by experimental techniques with an estimation of uncertainty. In order to estimate this s-process contamination through the isomer, a production ratio of the isomer to the ground state in 186Re has been measured through an activation technique with a thermal neutron provided by a nuclear reactor.
Arima T.
Chiba Satoshi
Hayakawa Tadaaki
Kajino Taka
Shinohara Nobuo
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