measured with the Crystal Ball/TAPS detector using the tagged photon facility at the MAMI C
accelerator in Mainz. In the energy range \ensuremathE_γ=0.95--1.4 GeV the reaction is
dominated by the excitation and sequential decay of the \ensuremathΔ(1700)D_33-
resonance. Angular distributions measured with high statistics allow us to determine the
ratio of hadronic decay widths \ensuremathηΔ/πS_11 and the ratio of the helicity amplitudes …