The optical model potential for intermediate-energy nucleon-nucleus scattering (≈ 10–200 MeV) exhibits a significant energy dependence in both the real and imaginary components. The Perey-Buck model associates the local potentials depending on the energy with the non-local Gaussian potentials F. Perey and B. Buck, Nucl. Phys. 32, 353–380 (1962). Still, the microscopic methods show that the imaginary part still has energy dependence due to the real temporal non-locality and the channel couplings among them. The present work mainly considers the energy-dependent nonlocality and thus the extension of semimicroscopic approaches. The real part is obtained through the single-folding of the M3Y-Paris interaction, which is density-dependent, while the imaginary part is phenomenological and includes coupled-channels effects. A range of energy-dependent nonlocality β(E) is introduced, and the results are contrasted with the experimental data from EXFOR for elastic scattering of neutrons and protons by nuclei from ¹²C to ²⁰⁸Pb. The findings indicate that differential cross sections and analyzing powers have been fitted much better, particularly in the backscattering areas; thus, the introduction of energy-dependent non-locality is necessary to explain the dispersive corrections and Pauli effects.
S. B. Masadeh (Wed,) studied this question.