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- W1978647245 abstract "We have studied the effects of pairing correlations on the excitation energy ${(E}^{*})$ dependence of the total nuclear level density, parity-projected level density, and spin cutoff factor for two heavy systems ${}^{152}mathrm{Sm}$ and ${}^{160}mathrm{Yb},$ within a microscopic approach based on static path approximation to a grand canonical partition function. For both systems considered, we find that pairing has significant effects on the ${E}^{*}$ dependence of total level densities. At moderate excitation energies ${(E}^{*}ensuremath{sim}10 mathrm{MeV})$ it supresses the total level density nearly by two orders of magnitude. By fitting the total level density to a Bethe-type formula with energy backshift $({ensuremath{Delta}}_{mathrm{BS}}),$ we find that ${ensuremath{Delta}}_{mathrm{BS}}ensuremath{approx}2.5 mathrm{MeV}$ for the excitation energy beyond $15 mathrm{MeV}.$ At lower excitation energies, however, ${ensuremath{Delta}}_{mathrm{BS}}$ is strongly ${E}^{*}$ dependent. We find that the effects of pairing on the spin cutoff factor and the parity-projected level densities (or parity asymmetry) is somewhat less important. We also compare our results for the spin cutoff factor with the ones conventionally employed in statistical model codes." @default.
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- W1978647245 date "1999-06-01" @default.
- W1978647245 modified "2023-09-26" @default.
- W1978647245 title "Influence of pairing correlations on the excitation energy, angular momentum, and parity dependence of nuclear level densities" @default.
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- W1978647245 doi "https://doi.org/10.1103/physrevc.59.3109" @default.
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