RELATIVISTIC EFFECTS AND THE ROLE OF HEAVY-MESON EXCHANGE IN DEUTERONPHOTODISINTEGRATION

Relativistic effects and the role of heavy-meson exchange in deuteron photodisintegration are studied systematically for photon energies bel ow the pion-production threshold. In a (p/M)-expansion, all leading-or der relativistic one-body and pi-exchange as well as all static heavy- meson exchange currents consistent with the Bonn momentum-space one-bo son-exchange potentials are included. In addition, one-and two-body bo ost effects have been investigated. Sizeable effects from the various two-body contributions beyond pi-exchange have been found in almost ev ery observable considered, i.e., differential cross section and single -polarization observables.