Half-lives and pre-supernova weak interaction rates for nuclei away from the stability line

Details Half-lives and pre-supernova weak interaction rates for nuclei away from the stability line Half-lives and pre-supernova weak interaction rates for nuclei away from the stability line

1998-06-26

arxiv.org/abs/nucl-th/9806082v1

J.Phys.G24:1641-1645,1998

Physics

Nuclear Physics

Nuclear Theory

11 pages; Latex; no figs; version to appear in J. Phys. G

Scientific paper

10.1088/0954-3899/24/8/045

A detailed model for the calculation of beta decay rates of the $fp$ shell nuclei for situations prevailing in pre-supernova and collapse phases of evolution of the core of massive stars leading to supernova explosion has been extended for electron-capture rates. It can also be used to determine the half-lives of neutron-rich nuclei in the $fp/fpg$ shell. The model uses an averaged Gamow-Teller (GT) strength function. But it can also use the experimental log ft values and GT strength function from $(n,p)$ reaction studies wherever available. The calculated rate includes contributions from each of the low-lying excited states of the mother including some specific resonant states ("back resonance") having large GT matrix elements.

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