Microscopic Nuclear Level Densities from Fe to Ge by the Shell Model Monte Carlo Method

Details Microscopic Nuclear Level Densities from Fe to Ge by the Shell Model Monte Carlo Method Microscopic Nuclear Level Densities from Fe to Ge by the Shell Model Monte Carlo Method

1998-09-22

arxiv.org/abs/nucl-th/9809066v1

Phys.Lett. B436 (1998) 231-237

Physics

Nuclear Physics

Nuclear Theory

to be published in Phys. Lett. B; includes 5 eps figures

Scientific paper

10.1016/S0370-2693(98)00911-3

We calculate microscopically total and parity-projected level densities for $\beta$-stable even-even nuclei between Fe and Ge, using the shell model Monte Carlo methods in the complete $(pf+0g_{9/2})$-shell. A single-particle level density parameter $a$ and backshift parameter $\Delta$ are extracted by fitting the calculated densities to a backshifted Bethe formula, and their systematics are studied across the region. Shell effects are observed in $\Delta$ for nuclei with Z=28 or N=28 and in the behavior of $A/a$ as a function of the number of neutrons. We find a significant parity-dependence of the level densities for nuclei with $A \alt 60$, which diminishes as $A$ increases.

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