Global Dirac phenomenology for proton-nucleus elastic scattering

Abstract

Energy-dependent global Dirac optical model potentials are found by fitting proton elastic scattering data in the energy range 20-1040 MeV for C12, O16, Ca40, Zr90, and Pb208. Three different energy- and atomic-mass-number-dependent global Dirac optical potentials are also obtained. A number of characteristic features of the potentials are discussed. In addition, the mean free path, the effective mass me*, the Dirac mass M*, and the relativistic energy shift E* are calculated. © 1993 The American Physical Society.