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Spin projection in the shell model Monte Carlo method and the spin distribution of nuclear level densities

Y. Alhassid, S. Liu, H. Nakada

nucl-tharXiv:nucl-th/0607062

Abstract

We introduce spin projection methods in the shell model Monte Carlo approach and apply them to calculate the spin distribution of level densities for iron-region nuclei using the complete (pf+g9/2)-shell. We compare the calculated distributions with the spin-cutoff model and extract an energy-dependent moment of inertia. For even-even nuclei and at low excitation energies, we observe a significant suppression of the moment of inertia and odd-even staggering in the spin dependence of level densities.

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