A simple semiphenomenological effective nucleon-nucleon interaction is used to show the effect of compressibility of nuclear matter on the real part of p plus Ca40 optical-model potential a proton energies up to 85 MeV. It is found that this nucleon-nucleon potential can predict both the depth and the shape of the phenomenological optical-model potential for energies up to 60 MeV assuming that is corresponds to a compression modulus of about 290 MeV.
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