Abstract
Phenomenological analysis of double charge exchange scattering of pions shows that there is a sizable isotensor term in the optical potential at resonant energies. In an earlier paper we proposed that this term could be expected to reflect coupling of the elastic and analog channels to particular nonelastic channels with specific isospin structure. In this paper we present detailed models for this channel coupling, based on pion absorption and correlated double scattering. It is shown that any of the models could contribute to the isotensor potential with the appropriate phase. New predictions of isospin dependence of the potential are given.
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