Optical potential models used in quasielasticCa40(e,e’p) calculations

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Abstract
Optical potentials obtained from elastic proton scattering have been successfully used to describe the final state interaction in (e,e’p) reactions. However, spectroscopic factors extracted from experimental data are often quite different depending on whether relativistic calculations or nonrelativistic calculations are used. Since the calculation of the (e,e’p) cross section requires the wave functions of the outgoing proton in the nuclear interior, different optical potential models could cause the differences in these calculations. We use a model which can take either nonrelativistic or relativistic optical potentials while keeping all other aspects of the calculation the same, and find that a relativistic optical potential compared with a nonrelativistic optical potential can cause a difference as much as 14%. We examined several optical models as well as the use of the Perey factor in nonrelativistic calculations.