Nonlocal optical model for deuteron elastic scattering

Abstract

Deuteron elastic scattering off light, intermediate, and heavy nuclei from 10Be to 120Sn corresponding to incident energies in the range 10–70 MeV is considered using the nonlocal model of Perey and Buck, which explicitly includes a Gaussian nonlocality (Perey and Buck. Nucl. Phys. A, 32, 353 (1962). doi:10.1016/0029-5582(62)90345-0). We obtain two sets of global nonlocal parameters, one for light 1p-shell nuclei and the other for intermediate and heavy ones. The geometrical parameters of each set are fixed, while the imaginary volume and imaginary surface depths vary linearly with both energy and the neutron–proton asymmetry of the target. Our best angular distribution fits are in very good agreement with the measured data. To test the model, we used our global parameters to predict the angular distributions for nuclei and energies that have not been included in the fitting procedure. The resulting χ2 values are as good as the values calculated using global local potentials in the literature or better, despite the fact that 12 out of the 15 parameters of the nonlocal potential are fixed. For the deuteron–nucleus scattering, we determined a nonlocality parameter of 0.45 fm, which compares well with the values obtained in previous works.