Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-10-14
Phys.Rev.Lett. 83 (1999) 4265
Physics
Nuclear Physics
Nuclear Theory
14 pages, 4 eps figures included, RevTex
Scientific paper
10.1103/PhysRevLett.83.4265
We introduce a particle-number reprojection method in the shell model Monte Carlo that enables the calculation of observables for a series of nuclei using a Monte Carlo sampling for a single nucleus. The method is used to calculate nuclear level densities in the complete $(pf+g_{9/2})$-shell using a good-sign Hamiltonian. Level densities of odd-A and odd-odd nuclei are reliably extracted despite an additional sign problem. Both the mass and the $T_z$ dependence of the experimental level densities are well described without any adjustable parameters. The single-particle level density parameter is found to vary smoothly with mass. The odd-even staggering observed in the calculated backshift parameter follows the experimental data more closely than do empirical formulae.
Alhassid Yoram
Liu Shujuan
Nakada Hitoshi
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