GW Progress in Neutron Couplings

An overview of the GW SAID group effort to analyze pion photoproduction on the neutron-target will be given. The disentangling of the isoscalar and isovector EM couplings of N∗ and Δ∗ resonances does require compatible data on both proton and neutron targets. The final-state interactions play a critical role in the state-of-the-art analysis in extraction of the γn → πN data from the deuteron target experiments. The new data help to constrain coupled-channel analysis fits used to disentangle the spectrum of N* resonances and extract their properties. Photon decay amplitudes N*àgamma+ n at the resonance poles will be determined. The neutron program is an important component of the current JLab, MAMI-C, SPring-8, ELSA, and ELPH studies.