Unified nuclear model and direct nuclear photoeffect I. Weak coupling effects

Abstract

A contribution to the direct El nuclear photoeffect coming from the indirect interaction via the electric quadrupole moment of the core is discussed. The oscillating core absorbs the incoming γ-ray and emits a surfon which is subsequently reabsorbed with the emission of the proton. The interference term between this two-stage mechanism contribution and the usual El-amplitude in the angular distribution is estimated in two particular cases to amount to a large fraction of the usual El term.