We present the results of a phenomenological analysis of all existing data on pion single-
and double-charge-exchange scattering to isobaric analog states at T π≃ 164 MeV. We use
a theory in which both reactions are described by the same optical potential, U. The form of
U is theoretically motivated and separates explicitly the effects of nuclear structure and
reaction dynamics. The latter is characterized phenomenologically by two complex numbers,
one for the isovector and one for the isotensor term in U. Elastic scattering from selected N …

[en] The expectation that pion double charge exchange (DCX) would be sensitive to the Δ
33 presence in nuclei has focused a great deal of attention on these reactions. Large DCX
cross sections observed for N= Z nuclei, in particular, have led to the conjecture that sizable
one-step contributions to DCX could occur through the Δ 33 components of the nuclear
wave functions. This idea provided a realization for a previously proposed two-component
phenomenological description of DCX for N> Z nuclei. According to this picture, anomalies …