COHERENT PION-PRODUCTION IN CHARGE-EXCHANGE REACTIONS AT INTERMEDIATEENERGIES

Recent studies are summarized of coherent pion production (CPP) in cha rge-exchange reactions at intermediate energies. The experimental data of CPP show a strong collective effect on a excited in nuclei in the spin-longitudinal channels, from where the coherent pion dominantly co mes. The observed collective effect and also other characteristic feat ures of the coherent pion are shown to be well understood by theoretic al calculations that take into account correlations due to the ir-exch ange interaction.