Shell-model Monte Carlo studies offp-shell nuclei

We study the gross properties of even-even and N=Z nuclei with A=48–64 using shell-model Monte Carlo methods. Our calculations account for all 0ħω configurations in the fp shell and employ the modified Kuo-Brown interaction KB3. We find good agreement with data for masses and total B(E2) strengths, the latter employing effective charges ${\mathit{e}}_{\mathit{p}}$=1.35e and ${\mathit{e}}_{\mathit{n}}$=0.35e. The calculated total Gamow-Teller strengths agree consistently with the B(${\mathit{GT}}_{+}$) values deduced from (n,p) data if the shell-model results are renormalized by 0.64, as has already been established for sd-shell nuclei. The present calculations therefore suggest that this renormalization (i.e., ${\mathit{g}}_{\mathit{A}}$=1 in the nuclear medium) is universal.