Abstract
Energy-dependent global Dirac optical model potentials are found by fitting proton elastic scattering data in the energy range 20--1040 MeV for $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{40}\mathrm{Ca}$, $^{90}\mathrm{Zr}$, and $^{208}\mathrm{Pb}$. 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 ${\mathit{m}}_{\mathit{e}}^{\mathrm{*}}$, the Dirac mass ${\mathit{M}}^{\mathrm{*}}$, and the relativistic energy shift ${\mathit{E}}^{\mathrm{*}}$ are calculated.
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