Approaches to the momentum distribution of nuclear matter

MANFRED L. RISTIG, P. M. Lam, A. Lejeune

M. F. Flynn, J. W. Clark, Robert M. Panoff +2 more

Majid Modarres, A. Rajabi, H. R. Moshfegh

Majid Modarres

The momentum distribution of nuclear matter n(k) is evaluated by using the cluster expansion for the occupation probability. The gap in n(k) at the Fermi surface is found to be about 0.96 compared with 1.0 for the noninteracting Fermi gas model. It is shown that the high-momentum tail of n(k) is very much smaller than it has been thought.

M. E. Grypeos, Eirene Mavrommatis

A. Mariano, Francisco Krmpotić, A. F. R. de Toledo Piza

It is shown that the norm corrections, introduced to avoid the violation of the constraints on the depletion of the hole states in the standard perturbative 2p2h approach, leads in nuclear matter to a dependence of the momentum distribution with the total nucleon number. This unphysical behavior, which in turn makes the depletion to be nonextensive, arises from contributions of disconnected diagrams contained in the norm. It is found that the extensivity is again recovered when the 4p4h excitations in the ground state are included, and a reasonable value for the total number of nucleons promoted above the Fermi level is obtained. \textcopyright{} 1996 The American Physical Society.