Surface-peaked medium effects in the interaction of nucleons with finite nuclei

Abstract

We investigate the asymptotic separation of the optical model potential for nucleon-nucleus scattering in momentum space, where the potential is split into a medium-independent term and another depending exclusively on the gradient of the density-dependent g matrix. This decomposition confines the medium sensitivity of the nucleon-nucleus coupling to the surface of the nucleus. We examine this feature in the context of proton-nucleus scattering at beam energies between 30 and 100 MeV and find that the pn coupling accounts for most of this sensitivity. Additionally, based on this general structure of the optical potential we are able to treat both, the medium dependence of the effective interaction and the full mixed density as described by single-particle shell models. The calculated scattering observables agree within 10% with those obtained by Arellano, Brieva and Love in their momentum-space g-folding approach.

arXiv comment16 pages, 8 figures, submitted to PRC

References in corpus (4)

• Non-localities in nucleon-nucleus potentials
• Extension of the full-folding optical model for nucleon-nucleus scattering with applications up to 1.5 GeV
• An in-medium full-folding model approach to quasielastic (p,n) charge-exchange reactions
• Functional medium-dependence of the nonrelativistic optical model potential

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• Irreducible nonlocality of optical model potentials based on realistic NN interactions
• Exact scattering waves off nonlocal potentials under Coulomb interaction within Schrödinger's integro-differential equation
• On the separability of microscopic optical model potentials and emerging bell-shape Perey-Buck nonlocality
• Ultraviolet suppression and nonlocality in optical model potentials for nucleon-nucleus scattering
• Light projectile elastic scattering by nuclei described by the Gogny interaction