Impulse-Approximation Nucleon-Nucleus Optical-Model Potential for the Dirac Equation

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Abstract
Three recent Letters have presented Dirac-equation optical-model calculations for intermediate-energy nucleon-nucleus scattering based upon a relativistic impulse approximation. In these works the relativistic impulse approximation is shown to be capable of explaining certain features of the experimental data that resist all attempts at a nonrelativistic impulse-approximation description. The reasons for the success of these relativistic impulse-approximation calculations are analyzed in the present work.