The central and tensor force matrix elements for arbitrary average and two-body potentials

A general method is described for computing central as well as tensor force matrix elements for shell-model states. The method consists of expanding the two-body potential into free multipole fields. The advantages of the method are that

(i) arbitrary forms of the average and two-body potential can be chosen; (ii) even in the case of a finite-range force, double integrals are eliminated, and the radial integrals are independent of the shape and parameters of the two-body force; and (iii) the central and the tensor forces are treated on the same footing.

FORTRAN codes employing this method are available for the computation of the two-body force matrix elements for an arbitrary nucleus.