BETWEEN 60 AND +60 MEV FOR THE 208A40 ≤ ≤ NUCLEI

The nucleon differential elastic scattering cross sections, the total proton reaction cross sections, and the single-particle energies of nucleon bound states for 40Ca, 90Zr, and 208Pb nuclei are reanalyzed in terms of the dispersive optical model at energies ranging from 75 MeV to 60 MeV. The resultant real effective Woods-Saxon potential, which corresponds to the dispersive potential, is studied as dependent on A, Z, and E and on projectile specie (proton or neutron). For the first time, a parameterization of the Woods-Saxon real part of the nucleon-nucleus optical potential is proposed for the 20840 ≤ ≤ A nuclei at energy ranging from 60 MeV to +60 MeV, including a range near the Fermi energy. The parameterization reflects the dispersion relation between the real and imaginary parts of the optical model potential through the energy dependence of the radius parameter of the real part of the potential. The method to determine the imaginary part of the optical model potential, which is symmetrical relative to the Fermi energy, is also proposed for the 20840 ≤ ≤ A nuclei. The differential elastic scattering cross sections, the total neutron interaction cross sections, the total proton reaction cross sections, and the single-particle energies of the nucleon bound states calculated in terms of the proposed nucleon-nucleus potential parameterization for some of the n,p+A ( 20840 ≤ ≤ A) systems are compared with the available experimental data, yielding a fairly good agreement