Previous measurements have shown that pion double-charge-exchange angular distributions between nonanalog $J^{\pi }=0^{+}$ states at $T_{\pi }=164\mathrm{}$ MeV are consistent with simple diffractive scattering, whereas angular distributions between analog $J^{\pi }=0^{+}$ states at $T_{\pi }=164\mathrm{}$ MeV are not. We present measurements of angular distributions for the nonanalog reaction ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}({\pi }^{+},{\pi }^{-}){}_{}{}^{16}{}_{}{}^{}\mathrm{Ne}$(g.s.) at two additional energies and compare the energy dependence with that expected for diffractive scattering.

• Received 5 March 1984

DOI:https://doi.org/10.1103/PhysRevC.29.2395