Nucleon-nucleon bound state contribution to the proton scattering by nuclei

Sensitivity of proton-nucleus scattering is studied to the off-shell behavior of the nucleon-nucleon (NN) effective interaction, particularly to the presence of the NN bound state. The effect is found to be negligible in a kinematical region where an optimal factorization approximation is justified. A sensitivity can be seen below 100 MeV of beam energy and for the light nuclei ${(}^{12}$C${,}^{16}$O). The effect is more pronounced for a tensor part of the NN t matrix which is shown in the charge-exchange cross section of proton scattering from $^{13}\mathrm{C}$.

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