Abstract
The Dirac formalism for the elastic scattering of nucleons has been extended to a coupled channel formalism taking into account collective excited states. Calculations for the scattering of 500 MeV protons on 40Ca shows large second-order effects on the elastic scattering. The imaginary scalar potential and the imaginary vector potential can be varied widely without giving so large effects on the elastic scattering. This large ambiguity is not limited to this case.
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