Photoproduction of a πN pair on nuclei and isobar configurations

A model of πN pair photoproduction on nuclei at high momentum transfer is presented. The image reaction amplitude is obtained by means of an extended impulse approximation, according to which the nuclear wave function includes delta-isobar components in addition to nucleon components. A one-particle transition operator is defined in terms of the two-body image and image photoproduction amplitudes. Direct and exchange mechanisms of the nuclear photoproduction reaction are studied, and numerical estimates are made and presented of image and image differential cross sections at photon incident energies in the image resonance region.