Ground-state Correlation Effects in Extended RPA Calculations

Abstract

We study normalization problems associated with use of perturbatively correlated ground-states in extended RPA schemes in the context of a specific but typical example. The sensitivity of the results to the amount of $2p2h$ admixtures to the correlated ground state is also investigated in terms of a modification of the standard perturbative approach.

Comments: 8 pages text (LaTex) and 1 figure (available upon request), to be published in Phys. Rev. C