Neutron-capture cross sections for Os-186 and Os-187 and the age of the Universe

Details Neutron-capture cross sections for Os-186 and Os-187 and the age of the Universe Neutron-capture cross sections for Os-186 and Os-187 and the age of the Universe

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.262..197b&link_type=abstract

Nature, vol. 262, July 15, 1976, p. 197-199. ERDA-sponsored research.

Astronomy and Astrophysics

Astronomy

15

Cosmology, Neutron Cross Sections, Nuclear Fusion, Osmium Isotopes, Universe, Age Factor, Astronomical Models, Radioactive Decay, Rhenium Isotopes, Stellar Temperature

Scientific paper

Neutron-capture cross sections were measured for Os-186 and Os-187 in the energy range up to about 150 keV, corresponding to stellar temperatures up to about 1.8 billion K. These cross sections are used to calibrate the Re-187 to Os-187 nuclear beta-decay clock suggested by Clayton (1964). The age of the Universe determined by the Re-Os clock is about 19.6 billion years.

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