MULTIPOLE ANALYSIS OF H-2(GAMMA,P)N IN THE DELTA-RESONANCE REGION

An energy-dependent multipole analysis of the photodisintegration of d euterium has been performed, for photon energies between 187 and 314 M eV using recent data taken with linearly polarized photons. A good fit is obtained With 11 free parameters determining :eight multipoles. A wide variety of multipole solutions has been examined and in all cases the cross-section with photon polarization parallel to the reaction p lane is dominated by electric transitions, with E2.E1 interference res ponsible for the observed forward-backward angular asymmetry. The cros s sections observed in perpendicular kinematics are dominated by magne tic multipoles. Several recent N Delta/NN coupled-channel calculations have predicted a pronounced 90 degrees dip in the cross section that is absent from the data. This dip can be reproduced by changing the M2 strength distribution in our fit. A comparison is made with multipole s calculated by Wilhelm and Arenhovel at 300 MeV.