2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83105As 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.17 pages, LaTeX, 10 PostScript figures, epsfig.sty. Submitted to J.Phys. GNuclear Theorytext