Convection current contributions to spin excitations

In this paper, the role of convection currents in electron scattering and the utility of Rosenbluth plots in separating and studying the familiar longitudinal and transverse form factors defined for electromagnetically induced nuclear transitions are reviewed. Further, noting that an energy-dependent probe-target-nucleon interaction can often be cast, to a good approximation, as an energy independent leading term plus a convection current dominated correction term, pion-nucleus and nucleon-nucleus transitions are studied involving these convection current corrections. A discussion is given of how, in both pion and nucleonnucleus interactions, techniques that separate the (q,E,θ) dependences of the nuclear response (as the Rosenbluth plot does for electron scattering) can be used to advantage