Abstract
For a system of fermions interacting via a pure pairing force, exact level densities are obtained in a semirealistic model space. The results are transmitted through graphs and tables so that they are readily available for comparison with various approximate methods. A fairly detailed comparison with a particular approximate method using the grand partition function is also made. The consequences of adding the quadrupole force to the Hamiltonian are discussed. Variational calculations done in the specific case of Sn isotopes suggest that although these nuclei are spherical in the ground state (zero temperature), it is possible that they prefer deformation at finite but low temperature. This can lead to very large changes in the calculated values of level densities.
[NUCLEAR STRUCTURE , ; calculated level density using quasispin formalism, grand partition method, and pairing-plus-quadrupole model at finite temperature.]
- Received 8 July 1977
DOI:https://doi.org/10.1103/PhysRevC.17.318
©1978 American Physical Society