Global Dirac phenomenology for proton elastic scattering from He4

In the past, Dirac phenomenology has been used to determine global proton-nucleus optical potentials for a number of targets. He-4 has not been previously included in these analyses. This paper addresses p+He-4 using medium-energy proton elastic scattering data with proton kinetic energies in the laboratory from 156 to 1728 MeV. The characteristic features of the optical potentials for p+He-4 are shown as well as the the predictive power of the global approach for this nucleus.