Bound state beta-decay and its astrophysical relevance

Kienle, P.
July 2000
AIP Conference Proceedings;2000, Vol. 529 Issue 1, p322
Academic Journal
Bound state β-decay of fully ionized [sup 163]Dy and [sup 187]Re nuclei, circulating in a storage cooler ring has been observed from the growth of their hydrogenlike daughter nuclei using two methods. As neutral atom, [sup 163]Dy is stable, and [sup 187]Re decays with T[sub 1/2]=43 Gyr. The half lifes of [sup 163]Dy[sup 66+] and [sup 187]Re[sup 75+] determined by bound state β-decays to their respective K-orbits have been determined to T[sub 1/2]=(48±3)d and T[sub 1/2]=32.9±2.0 yr, respectively. The astrophysical relevance of both observations will be presented. The observed bound state β-decay of [sup 163]Dy[sup 66+] explains the high abundance of [sup 164]Er, due to a s-process sequence including bound state β-decay of [sup 163]Dy[sup 66+]. From the observation of the bound state β-decay of [sup 187]Re[sup 75], the [sup 187]Re-[sup 187]Os-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. © 2000 American Institute of Physics.


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