Abstract
Abstract We calculate the momentum distribution n(k) of nucleons in nuclear matter from a realistic hamiltonian. First the n(k) is calculated from a variational wave function containing central, spin, isospin, tensor and spin-orbit pair correlations. The non-central correlations are found to give the major part of the deviation of n(k) from the θ(kF-k) of a Fermi gas. Next we use second-order correlated-basis perturbation theory to study the effect of correlated 2p2h admixtures in the ground state. These admixtures give significant corrections to the variational n(k), particularly in the region k ∽ kF. They are necessary to obtain the correct behavior of n(k ∽ kF). The discontinuity of n(k) at k = kF is found to be 0.7 and its relations to the effective mass, the one-particle Green function and the difference between charge densities of 206Pb and 205Tl are discussed. The density dependence of n(k) is studied, and the n(k∽kF) is found to be relatively insensitive to density in the region ρ = 1 4 ρ 0 to ρ 0 .
Published Version
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