Abstract
With the advent of nuclear reactions on unstable isotopes, there has been a renewed interest in
using isobaric analogue resonances (IAR) as a tool for probing the nuclear structure. The position
and width of isobaric analogue resonances in nucleon-nucleus scattering are accurate and detailed
indicators of the positions of resonances and bound states with good single-particle characters.
We report on implementation within our coupled-channels code FRESCO of the charge-exchange
interaction term that transforms an incident proton into a neutron. Isobaric analog resonances
are seen as peaks in gamma-ray spectrum when the proton is transformed into a neutron at an energy
near a neutron bound state. The Lane coupled-channels formalism was extended to follow the nonorthogonality of this neutron channel with that configuration of an inelastic outgoing proton, and
the target being left in a particle-hole excited state. This is tested for 208Pb, for which good (p,p’g)
