Medium-Energy Deuteron Photodisintegration

Abstract

It is shown that the distinctive features of the photoeffect angular distribution in the energy range 20-100 Mev probably result from a strong modification of the ${}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}$ outgoing wave amplitude, to be understood as a result of the excitation of virtual mesons in a fashion which violates the Siegert theorem. Some evidence also is found which suggests the need for a repulsive-core modification of the ground-state wave function. The contributions from the transition ${}_{}{}^3{}_{}{}^{}D_1^{}{}_{}{}^{}\to {}_{}{}^3{}_{}{}^{}F_2^{}{}_{}{}^{}$ are analyzed, and are found to be rather large.