Abstract
We discuss some theoretical aspects of pion-gamma angular correlation measurements following inelastic pion-nucleus scattering in the light of recent progress in understanding the reaction mechanism within the isobar-doorway model. For the simple spin sequence 0 + → J P → 0 +, it is possible to separate two basic classes of reaction contributions in a model-independent and fairly simple way, based entirely on symmetry considerations. In the limit of infinitely heavy nucleons, these two classes reduce to coupling to the usual transition density and spin density. The method is compared to the related separation of longitudinal and transverse form factors in electron scattering.
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