Effect of nuclear deformation on few-quasiparticle state densities

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Abstract
A microscopic combinatorial approach is used to investigate the influence of the nuclear deformation on the distributions of quasiparticle states. It is shown that nuclear deformation tends to suppress strong fluctuations observed in the similar calculations performed in the space of spherical shell-model basis vectors. The dependence of the pairing effects on the deformation is analyzed. The applicability of the formula by Williams is examined and found to be only valid for strongly deformed medium and heavy nuclei.