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A microscopic description of the quasielastic (p,n) charge-exchange reaction(here, charge-exchange scattering between analogue states) is presented anddiscussed. Emphasis is focused on the spin-isospin structure of theprojectile-target coupling. The model is a coupled-channel extension of thefull-folding optical model approach (OMP) developed for nucleon elasticscattering, where emphasis is placed on retaining the genuine off-shellbehavior of realistic effective interactions in the nuclear medium. Theresulting 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-freeresults provide a reasonable description of the $^{14}$C(p,n)-data at protonenergies above $\sim$100 MeV, but deteriorate for heavier targets. Theseshortcomings are analyzed and possible ways to correct them are discussed.

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