Abstract
The random phase approximation (RPA) in conjunction with an approximate projection of angular momentum and particle number is used to investigate ground-state correlations in the yrast wave functions of realistic nuclei at high spins. One has to distinguish between two types of correlations, those due to virtual excitation of vibrations and those caused by the removal of the spurious components in the symmetry-violating intrinsic wave function. Both types produce a lowering in the energy of several MeV and both show large anomalies in the backbending region. One observes, however, a cancellation of these anomalies, so that the total correlation energy is a smooth function of angular momentum which can be taken into account in a theory with uncorrelated product states by a simple renormalization of the effective interaction.
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