Abstract
Coherent π 0 photoproduction is considered on closed-shell nuclei in the DWIA frame from threshold up to pion energies of 50 MeV. The elementary photoproduction operator is taken from Blomqvist and Laget and treated in the coordinate-space representation. It includes, besides the negligible Born terms, delta formation in the s-channel and ω 0 exchange in the t-channel, two mechanisms which have comparable importance even near threshold. The emerging pion wave is distorted by optical-model potentials which give equally good fits both to pionic atom data and pion scattering data. In the considered energy range the DWIA cross section is enhanced with respect to the plane-wave case by an amount between 50% and 100% depending on the particular optical-model potential. Distortion is necessary to gain a satisfactory agreement with the available data.
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