Abstract
We re-examine the Dirac approach to proton-nucleus elastic scattering at intermediate energies in the light conventional multiple scattering theory. We show that the main virtue of the relativistic treatment is to provide a cut-off for the ohterwise badly behaved spin-orbit potential at high momenta. Once this has been understood, there are many different and more plausible ways of restoring the agreement between the traditional theory and experiment. To illustrate this point, we show analytically that the Lorentz-Lorenz effect yields results which are identical to the Dirac approach. The only remnant of analytically that the Lorentz-Lorenz effect yields results which are identical to the Dirac approach. The only remnant of relativity in this case is kinematics.
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