Study of the partial wave structure of image photoproduction on protons

Analysis of the partial wave structure of image reaction is presented in the energy region from threshold up to the total center-of-mass energy image. Angular distributions measured with the Crystal Ball/TAPS hermetic detector system at the Mainz Microtron MAMI are expanded in terms of spherical harmonics. The relation of the extracted moments to the partial wave structure of the reaction amplitude is discussed and compared with predictions from model calculations.