Role of inelastic couplings in 4He+208Pb elastic scattering in a wide energy range

The phenomenological strengths of the real part of the optical potential, obtained from elastic scattering data analyses within the optical model (OM) approach, present significant energy-dependence. This behavior has been associated with the intrinsic energy-dependence of the effective nucleon-nucleon interaction. However, in earlier works, we proposed that at least part of this dependence can arise from the effect of couplings to inelastic states of the nuclei. In order to deepen this study, in this paper we present extensive data analyses for the elastic scattering and inelastic excitation of 111 states of Pb-208, for the He-4 + Pb-208 system in a wide energy range. For the purpose of comparison, the theoretical cross sections are obtained using different approaches for the imaginary part of the potential, and within both contexts: OM (distorted wave Born approximation) and coupled-channel calculations.

Automated summary

The real part of the optical potential obtained from elastic scattering data analyses within the optical model approach exhibits significant energy-dependence. Previous studies have suggested that this dependence may arise from couplings to inelastic states of the nuclei. This paper presents extensive data analyses for the elastic scattering and inelastic excitation of 111 states of Pb-208 in the He-4 + Pb-208 system, in order to further investigate this phenomenon.