The surface and curvature properties of semi-infinite polarized nuclear matter (SPNM) are calculated using an expansion for the Fermi integrals up to ${\mathit{T}}^2$. A density matrix expansion is obtained for a modified form of the Seyler-Blanchard interaction. New parameters that characterize the surface and curvature properties of SPNM are introduced. The level density parameter is extracted from the low temperature expansion of the free energy and compared with previous calculations. A reasonable agreement is obtained with the parameters calculated before. © 1996 The American Physical Society.

• Received 2 March 1995

DOI:https://doi.org/10.1103/PhysRevC.53.1670