Complete 0ħω calculations of Gamow-Teller strengths for nuclei in the iron region

Gamow-Teller strengths for selected nuclei in the iron region (A∼56) have been investigated via shell-model Monte Carlo calculations with realistic interactions in the complete ${\mathit{f}}_{\mathit{p}}$ basis. Results for all cases show significant quenching relative to single-particle estimates, in quantitative agreement with (n,p) data. The T=0 residual interaction and the ${\mathit{f}}_{7/2}$-${\mathit{f}}_{5/2}$ spin-orbit splitting are shown to play major roles in the quenching mechanism. Calculated B(E2,$2_1^{+}$→$0_1^{+}$) values are in fair agreement with experiment using effective charges of ${\mathit{e}}_{\mathit{p}}$=1.1e and ${\mathit{e}}_{\mathit{n}}$=0.1e.