Longrange correlations and the momentum distribution in nuclei
Abstract
The influence of correlations on the momentum distribution of nucleons in nuclei is evaluated starting from a realistic nucleonnucleon interaction. The calculations are performed directly for the finite nucleus ^{16}O making use of the Green function approach. The emphasis is focused on the correlations induced by the excitation modes at low energies described within a model space of shellmodel configurations including states up to the sdg shell. Our analysis demonstrates that these longrange correlations do not produce any significant enhancement of the momentum distribution at high missing momenta and low missing energies. This is in agreement with highresolution ( e, e' p) experiments for this nucleus. We also try to simulate the corresponding effects in large nuclei by quenching the energy spacing between singleparticle orbits. This yields a sizable enhancement of the spectral function at large momenta and small energy. Such behavior could explain the deviation of the momentum distribution from the meanfield prediction, which has been observed in ( e, e', p) experiments on heavy nuclei like ^{208}Pb.
 Publication:

Nuclear Physics A
 Pub Date:
 February 1996
 DOI:
 10.1016/03759474(96)00142X
 arXiv:
 arXiv:nuclth/9603041
 Bibcode:
 1996NuPhA.604..245A
 Keywords:

 Nuclear Theory
 EPrint:
 Nucl.Phys. A604 (1996) 245262