PERTURBATIVE MANY-BODY APPROACHES TO FINITE NUCLEI

In this work we discuss various approaches to the effective interaction appropriate for finite nuclei. The methods we review are the folded-diagram method of Kuo and co-workers and the summation of folded diagrams as advocated by Lee and Suzuki. Examples of applications to sd-shell nuclei from previous works are discussed together with hitherto unpublished results for nuclei in the pf-shell. Since we find the method of Lee and Suzuki to yield the best converged results, we apply this method to calculate the effective interaction for nuclei in the pf-shell. To calculate this effective interaction we have used three recent versions of the Bonn meson-exchange potential model. These versions are fitted to the same set of data and differ only in the strength of the tensor force. The importance of the latter for finite nuclei is also discussed.