title: Spin projection in the shell model monte carlo method and the spin distribution of nuclear level densities.
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.
authors.affiliation: Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06520, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Alhassid
authors.forename: S
authors.initials: S
authors.lastname: Liu
authors.forename: H
authors.initials: H
authors.lastname: Nakada