Beta decay of 187Re and cosmochronology

Details Beta decay of 187Re and cosmochronology Beta decay of 187Re and cosmochronology

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phrvc..47.2954a&link_type=abstract

Physical Review C (Nuclear Physics), Volume 47, Issue 6, June 1993, pp.2954-2960

Physics

Nuclear Physics

5

Beta Decay, Double Beta Decay, Electron And Muon Capture, 150<=A<=189, Gas-Filled Counters: Ionization Chambers, Proportional, And Avalanche Counters, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

Uncertainties which limit the use of the 187-187Os isobaric pair as a cosmochronometer for the age of the galaxy and the universe include those of the partial half-lives of the continuum and bound-state decays of 187Re. While the total half-life of the decay is well established, the partial half-life for the continuum decay is uncertain, and several previous measurements are not compatible with each other. A high-temperature quartz proportional counter has been used in this work to remeasure the continuum decay of 187Re by introducing a metallo-organic rhenium compound into the counting gas. The measured beta end-point energy for the continuum decay of neutral 187Re to singly ionized 187Os of 2.70+/-0.09 keV agrees with earlier results. However, the present half-life measurement of (45+/-3) Gyr agrees within the quoted uncertainties only with the earlier measurement of Payne [Ph.D. thesis, University of Glasgow, 1965 (unpublished)] and Drever (private communication). The new half-life for the continuum decay and the total half-life of (43.5+/-1.3) Gyr, as reported by Linder et al. [Nature (London) 320, 246 (1986)] yield a branching ratio for the bound-state decay into discrete atomic states of (3+/-6)%. This is in agreement with the most recent calculated theoretical branching ratio of approximately 1%.

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