Charged- π Photoproduction at 180° in the Energy Range between 300 and 1200 MeV

The differential cross sections at 180^∘{} for the reactions γ+p→π⁺+n and γ+n→π^-+p were measured using a magnetic spectrometer to detect π^± mesons. In order to reduce the spread of energy resolution due to the nucleon motion inside the deuteron, a photon difference method was employed with a 50-MeV step for the reaction γ+n→π^-+p. The data show structures at the second- and the third-resonance regions for both reactions. A simple phenomenological analysis was made for fitting the data, and the results are compared with those of previous analyses.