Direct laboratory determination of the 187Re half-life

Details Direct laboratory determination of the 187Re half-life Direct laboratory determination of the 187Re half-life

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..246l&link_type=abstract

Nature, Volume 320, Issue 6059, pp. 246-248 (1986).

Mathematics

Logic

23

Scientific paper

The long-lived, naturally occurring radionuclide 187Re is important in geochemistry and cosmology as a nucleochronometer. Until now there have been no direct laboratory measurements which have avoided the difficulties of both low-energy β-counting and dependence on radiometric ages of rocks and meteorites. We report here a half-life of (4.35 +/- 0.13) × 1010 yr, based on the growth of 187Os over a 4-yr period into a large source of osmium-free rhenium. Since our result agrees with the best geochemically determined values, no significant revision of the present galactic age limits based on the geochemical values is necessary. The agreement at the 5% level of the decay rates determined on laboratory and meteorite-age timescales places a tight constraint on cosmological models in which fundamental `constants' are allowed to vary. In particular, the fine-structure constant, α, must have changed by less than one part in 105 over the past 4.5 × 109 yr.

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