Abstract

We review the present status of the calculation of ird elastic scattering, including some discussion of relativistic three-body calculations. The present theoretical understanding of the effect of true pion absorption on the elastic channel, in terms of models of the NNπ system is also mentioned. An outline of elastic, charge exchange and double charge exchange scattering of pions from A = 3 and 4 nuclei is presented — both from the theoretical and experimental viewpoint. Finally, we touch on recent progress in the more challenging pion production/absorption reactions.

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