A local-density-approximation description of high-momentum tails in isospin asymmetric nuclei

Abstract

We adapt the local density approximation to add the high-momentum tails (HMTs) to finite nuclei's Slater-determinant momentum distributions. The HMTs are extracted by the extended Brueckner-Hartree-Fock (EBHF) method or by the lowest order cluster approximation. With a correction factor being added to EBHF, it is sufficiently in agreement with the experimental benchmark, i.e., the high-momentum N/Z ratios approximately equal to 1, and the low-momentum N/Z ratios approximately equal to N/Z of the systems. It is also found that the tensor force makes the nucleon-nucleon correlations appear more easily on the nuclear surface region and the percentage of high-momentum (p>300 MeV/c) nucleons, around 17%–18%, independent of isospin asymmetry.