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HK: Hadronen und Kerne

HK 4: Electromagnetic Probes I, Photoproduction

HK 4.3: Gruppenbericht

Montag, 16. März 1998, 15:00–15:30, B

Meson retardation in deuteron photodisintegration above π-threshold — •M. Schwamb¹, H. Arenhövel¹, Th. Wilbois², and P. Wilhelm¹ — ¹Institut für Kernphysik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany — ²Institut für Theoretische Physik, Universität Hannover, D-30167 Hannover, Germany

Photodisintegration of the deuteron above π-threshold is studied in a coupled channel approach including N Δ- and π d-channels and with consideration of complete pion retardation in potentials and exchange currents. The NN-interaction model is an improved version of the Bonn-OBEPT potential which includes self-energy contributions. The retarded pion exchange currents include also recoil contributions, and are consistent with the hadronic interaction model with respect to gauge invariance. A much improved description of total and differential cross sections as well as some polarization observables in the photon energy region between π-threshold and 400-450 MeV is achieved.