Nonlocality parameters of microscopic optical potentials from Skyrme-based nuclear structure models at low energies

Abstract

We investigate the non-locality parameters ${\hat{I}}^2$ in nucleon-nucleus interactions for ${}^{16}\mathrm{O}$, ${}^{40}\mathrm{Ca}$, ${}^{48}\mathrm{Ca}$, and ${}^{208}\mathrm{Pb}$ using a microscopic optical potential (MOP) derived from nuclear structure models based on Skyrme self-consistent mean-field calculations at low incident energies. No ad hoc adjusted parameters were employed in the present calculations. The analysis reveals that the non-locality parameter exhibits a clear dependence on the radial position within the nucleus, the incident nucleon energy, and the choice of target nucleus. At incident energies below $30$ MeV, the ${\hat{I}}^2$ lies between $0.8$ fm and $1.2$ fm for all considered targets. For the light nucleus ${}^{16}\mathrm{O}$, the non-locality parameter in the interior is smaller than that on the surface, whereas for medium and heavy nuclei ${(}^{40}\mathrm{Ca}$, ${}^{48}\mathrm{Ca}$, and ${}^{208}\mathrm{Pb}$ ), the values are comparable in both regions.

7 pages, 4 figures