The effect of gap in n(k,

The present work evaluates the effect of gap in the density-dependent one-body momentum distribution, $ n(k,\rho)$, at the Fermi surface on the calculation of the single-particle properties of nucleons, i.e., the momentum- and density-dependent single-particle potential and the nucleon effective mass, and also on the calculation of the ground-state binding energy of the selected closed-shell nuclei, i.e., 16O, 40Ca, and 56Ni. In order to do this, $ n(k,\rho)$ is constructed by use of the calculations of the lowest-order constrained variational method for the symmetric nuclear matter with the $ Av_{18}$ potential up to $ J_{max}=2$ and 5. It is shown that the gap in $ n(k,\rho)$ at the Fermi surface has no significant effect on the calculation of single-particle properties in the case of $ J_{max}=5$. In the relevant evaluation of the ground-state binding energy of selected nuclei, it is seen that the binding energy of 16O, improved by including $ n(k,\rho)$, is closer to the experimental data, contrary to 40Ca and 56Ni