  As follows from the energies of single-particle states in ^{40}Ca, ^{90}Zr
and ^{208}Pb nuclei the contribution of many-particle NN forces to the nuclear
single-particle potential is at least the sum of repulsive and attractive parts
resulting from three-particle and four-particle forces respectively. In
addition the specified nucleon density distributions in the above nuclei are
determined from both the 1 GeV proton-nucleus elastic scattering and the
single-particle energies.
