In-medium full-folding model approach to quasielastic (p,n) charge-exchange reactions

Abstract

A microscopic description of the quasielastic (p,n) charge-exchange reaction (here, charge-exchange scattering between analog states) is presented and discussed. Emphasis is focused on the spin-isospin structure of the projectile-target coupling. The model is a coupled-channel extension of the full-folding optical model approach (OMP) developed for nucleon elastic scattering, where emphasis is placed on retaining the genuine off-shell behavior of realistic effective interactions in the nuclear medium. The resulting non-local optical potentials are applied to the calculation of (p,n) differential cross sections, with particular emphasis on small-angle Fermi (Delta S=0) cross sections to isobaric analog states. These parameter-free results provide a reasonable description of the C-14(p,n) data at proton energies above similar to 100 MeV, but deteriorate for heavier targets. These shortcomings are analyzed and possible ways to correct them are discussed.