MODEL-CALCULATIONS OF DOUBLY CLOSED-SHELL NUCLEI IN CBF THEORY .2. ONE-BODY DENSITY-MATRIX AND MOMENTUM DISTRIBUTION

The one body density matrix and the momentum distribution of N = Z nuclei are computed using correlated basis function theory and Fermi hypernetted chain theory. The results obtained with central nucleon-nucleon interactions are presented and the effects of the scalar internucleon correlations are enlightened. A version of the local density approximation for the one body density matrix, that takes particular care of the dynamical correlations, is studied. Its effectiveness is checked against correlated basis function calculations in model nuclei. The approximation is used to evaluate the momentum distribution in realistic models of nuclei.