Computer Science
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978znat...33..887c&link_type=abstract
Zeitschrift für Naturforschung, Teil a, vol. 33a, Aug. 1978, p. 887-889.
Computer Science
3
Chronometers, Cosmology, Osmium Isotopes, Radioactive Age Determination, Rhenium Isotopes, Absorption Cross Sections, Abundance, Accuracy, Half Life, Meteoritic Composition, Reliability, Universe
Scientific paper
The recently measured ratio of the neutron-capture cross sections of Os-186 and Os-187 have been used to draw far-reaching conclusions regarding the age of the universe. These conclusions are based on the Re-187 half-life and the Re/Os abundance ratio. The present paper argues, however, that this abundance ratio and the Re-187 half-life may not be as well known as is generally assumed. Under certain conditions, discrepancies between the obtained age of the nuclei and presently accepted Hubble ages appear to exist. These discrepancies become a certainty if the Os/Re abundance ratio resulting from empirical abundance systematics is accepted instead of the somewhat lower ratio measured for meteorites. Thus, it is claimed that the reliability of the Re-187/Os-187 pair as a nucleocosmochronometer is still open to discussion.
Conrad Jan
Zeh Dieter H.
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