Projectile and target delta excitation in the (3He,t) and (3He,3He) reactions

We study simultaneously the (3He, t) and (3He, 3He) reactions on proton and neutron targets in the region of the delta excitation resonance. We observe that the mechanism of delta excitation in the target dominates the (3He, t) reaction on the proton, but the mechanism of delta excitation in the projectile is important in the (3He, t) reaction on the neutron, and largely dominates the (3He, 3He) reaction on proton and neutron targets. The two mechanisms give rise to different shapes in the energy distributions of the t or 3He outgoing particles and the weights and shapes of the mechanism change appreciably with the energy of the projectile. The combined experimental study of both reactions as a function of energy is thus a much richer source of information on the dynamics of these problems than the study of the (3He, t) reaction alone, where the experimental efforts have so far concentrated. (orig.)