Abstract
The differential cross sections for ${\ensuremath{\pi}}^{\ensuremath{-}}+p\ensuremath{\rightarrow}\ensuremath{\gamma}+n$ at ${40}^{\ensuremath{\circ}}<{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{\ensuremath{\theta}}}_{\ensuremath{\gamma}}<{150}^{\ensuremath{\circ}}$ at c.m. total energies 1245 and 1337 MeV are presented. The results do not agree with predictions based on the $\ensuremath{\Delta}I<~1$ rule for the electromagnetic current and fixed-$t$ dispersion relations. Our data can be fitted with the Sanda-Shaw model, in which the electromagnetic current contains an isotensor component. Our angular distribution at 1337 MeV agrees with the inverse reaction as deduced from $\ensuremath{\gamma}d$ work; however, there is some disagreement at 1245 MeV.
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