Role of inelastic couplings in 4He + 208Pb elastic scattering in a wide energy range. (19th January 2022)

• Record Type: Journal Article
• Authors: Chamon, L C; Gasques, L R; Zamora, J C
• Is Part Of: Journal of physics. Volume 49:Number 3(2022)
• Publication Date: 2022-01-19
• Subjects: nuclear interaction -- elastic scattering -- inelastic scattering; Nuclear physics -- Periodicals; Particles (Nuclear physics) -- Periodicals; Physique nucléaire -- Périodiques; Particules (Physique nucléaire) -- Périodiques; Kernfysica; Elementaire deeltjes; 539.7
• DOI: 10.1088/1361-6471/ac3891
• Languages: English
• ISSNs: 0954-3899

Abstract

Abstract: 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 208 Pb, for the 4 He + 208 Pb 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.