Abstract
In the independent particle model which forms the basis for the nuclear level density expressions of Bethe1, Van Lier and Uhlenbeck2 and Bloch3 nucleons move independently in a central potential. There is a well-defined set of single-particle orbitals, each nucleon occupies one of these orbitals subject to Fermi statistics, and the total energy of the nucleus is equal to the sum of the energies of the individual nucleons. The basic question is what is the range of validity of this Fermi gas description and, in particular, what are the roles of the residual interactions and collective modes. In this talk I will try to provide some insight into these questions through a detailed examination of experimental level densities in light mass systems.
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