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A detailed model for the calculation of beta decay rates of the $fp$ shellnuclei for situations prevailing in pre-supernova and collapse phases ofevolution of the core of massive stars leading to supernova explosion has beenextended for electron-capture rates. It can also be used to determine thehalf-lives of neutron-rich nuclei in the $fp/fpg$ shell. The model uses anaveraged Gamow-Teller (GT) strength function. But it can also use theexperimental log ft values and GT strength function from $(n,p)$ reactionstudies wherever available. The calculated rate includes contributions fromeach of the low-lying excited states of the mother including some specificresonant states ("back resonance") having large GT matrix elements.Comment: 11 pages; Latex; no figs; version to appear in J. Phys.

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