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In the present work, we have reported $\beta^+$/EC-decay half-lives for $Z =21 -30$ nuclei using large-scale shell-model. %and N $\leq$ A recent studyshows that some proton-rich nuclei in this region belong to the island ofinversion. We have performed calculations for these nuclei using KB3G effectiveinteraction, while for Ni, Cu, and Zn nuclei we have used JUN45 effectiveinteraction in the $f_{5/2}pg_{9/2}$ model space. The calculated quenchingfactors for $fp$ and $f_{5/2}pg_{9/2}$ space using KB3G and JUN45 effectiveinteractions are also reported. Shell-model results of $\beta$-decayhalf-lives, excitation energies, log$ft$ values, and branching fractions arediscussed and compared with the available experimental data. We have obtained areasonable agreement with the available data.

Shell-model study of $\beta^+$/EC-decay half-lives for $Z = 21-30$ nuclei