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Nuclear level densities in the static-path approximation: (I). A solvable model

1992
16 pages
Published in:
  • Nucl.Phys.A 549 (1992) 43-58
  • Published: 1992
DOI:
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Abstract: (Elsevier)
We investigate the static-path approximation (SPA) and mean-field approximation (MFA) for the level density within a solvable SU(2) model. Comparing the SPA level density to the MFA one, we find an enhancement with a great sensitivity to the interaction strength, in agreement with exact analytic results. This enhancement compensates for a corresponding suppression which occurs at negative temperatures. The saddle-point approximation used in converting the partition function to the level density works well at all but low energies.