Isovector couplings for nucleon charge-exchange reactions at intermediate energies.

Abstract

The isovector parts of the effective nucleon-nucleon interaction are studied by examination of the reaction $^{14}\mathrm{C}$(p,n) at intermediate energies near zero momentum transfer with use of recently developed G-matrix and free--t-matrix interactions. The spin-independent coupling (${V}_{\ensuremath{\tau}}$) exhibits a strong energy and density dependence which, in the case of the G matrix based on the Bonn potential, significantly improves the agreement between calculated values of \ensuremath{\Vert}${V}_{\ensuremath{\sigma}\ensuremath{\tau}}$/${V}_{\ensuremath{\tau}}$${\ensuremath{\Vert}}^{2}$ at q=0 and those recently extracted from the reaction $^{14}\mathrm{C}$(p,n).