Scattering amplitudes for the pion photoproductions have been derived on the chiral bag model by taking into account pion cloud effects, pion-pole term, and antiquark propagation. The differential cross section for ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$(γ,${\pi }^{+}$${)}^{13}$B has also been calculated.

• Received 8 December 1988

DOI:https://doi.org/10.1103/PhysRevC.39.2295