Isobaric single charge-exchange reactions using the Argonne V18 G-matrix folding model

The present study reports a systematic analysis of the cross section and analyzing power of the isobaric single charge-exchange (p,n) reactions at low energies (from 23 to 45 MeV) within the framework of the Lane model. For the latter, the G-matrix folding model with Argonne V18 nucleon-nucleon potential is used to treat the isospin dependence of not only the central but also the spin-orbit components of the in-medium nucleon-nucleon interaction. Results obtained show that the isospin-density dependence of the G-matrix with Argonne V18 interaction provides a good overall description of the cross section and analyzing power data of several isobaric single charge-exchange (p,n) reactions on different targets. This dependency should be, therefore, taken into account in future calculations with the G-matrix interaction. Our study also suggests that the neutron excess densities should be used, instead of the conventional isovector densities, to determine the transition densities in the charge-exchange (p,n) reactions on different targets, especially on those having a small number of neutron excess.