Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..529..322k&link_type=abstract
CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS: 10th International Symposium. AIP Conference Proceedings, Volume 529, pp. 32
Astronomy and Astrophysics
Astrophysics
Beta Decay, Double Beta Decay, Electron And Muon Capture, Hydrostatic Stellar Nucleosynthesis, 150<=A<=189, Origin, Formation, Evolution, Age, And Star Formation
Scientific paper
Bound state β-decay of fully ionized 163Dy and 187Re nuclei, circulating in a storage cooler ring has been observed from the growth of their hydrogenlike daughter nuclei using two methods. As neutral atom, 163Dy is stable, and 187Re decays with T1/2=43 Gyr. The half lifes of 163Dy66+ and 187Re75+ determined by bound state β-decays to their respective K-orbits have been determined to T1/2=(48+/-3)d and T1/2=32.9+/-2.0 yr, respectively. The astrophysical relevance of both observations will be presented. The observed bound state β-decay of 163Dy66+ explains the high abundance of 164Er, due to a s-process sequence including bound state β-decay of 163Dy66+. From the observation of the bound state β-decay of 187Re75, the 187Re-187Os-cosmochronometer may be calibrated using chemical star evolution models, and including reastration effects. From recent abundance measurements of Re- and Os-isotopes in meteorites the age of the Galaxy was deduced as (15+/-2) Gyr, with our new calibration. .
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