We evaluate the thermal properties of ${}^{40}\mathrm{Ca}$ and ${}^{90}\mathrm{Zr}$ with two different effective Hamiltonians in a mean-field approach. Observed differences in the results are traced to the dependence of thermal properties on the shell gap near the Fermi surface which varies with the choice of Hamiltonian.

• Received 13 February 1998

DOI:https://doi.org/10.1103/PhysRevC.58.2754