On the Amplitude of Proton Scattering on the Bound Nucleons from Analysis of the Proton–Nucleus Data at $${E_{p}\leq 100}$$ MeV

The experimental cross sections of the proton elastic scattering at energies $$E_{p}\leq 100$$ MeV on the target nuclei $${}^{12}$$ C, $${}^{40}$$ Ca, $${}^{58}$$ Ni, and $${}^{208}$$ Pb are analyzed basing on the microscopic model of proton–nucleus optical potential. The in-medium effect on the proton–nucleus scattering is estimated by adjusting three parameters of the proton–nucleon amplitude of scattering that describe the proton scattering on the bound nuclear nucleon. These parameters are compared with those but for the proton scattering on free nucleon.