Shell-model Monte Carlo studies of fp-shell nuclei

Creators: Langanke, K.; Dean, D. J.; Radha, P. B.; Alhassid, Y.; Koonin, S. E.

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Abstract

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 ep=1.35e and en=0.35e. The calculated total Gamow-Teller strengths agree consistently with the B(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., gA=1 in the nuclear medium) is universal.

Additional Information

©1995 The American Physical Society. Received 21 March 1995. This work was supported by NSF Grants Nos. PHY91-15574, PHY94-12818, and PHY94-20470, and by DOE Grant No. DE-FG02-91-ER40608. We thank Professor A. Poves for useful discussions and for supplying us with some results of his shell-model diagonalizations prior to publication. Computational cycles were provided by the Concurrent Supercomputing Consortium and by the VPP500, a vector parallel processor at the RIKEN supercomputing facility; we thank Dr. I. Tanihata and Dr. S. Ohta for their assistance with the latter.

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