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A model of the nucleon based on the Bethe-Sal:peter equation is used to investigate the res:ponse of the binding energy to small :perturbations. Comparisons ,vi th the predictions of an NjD model are drawn, and it is shown t~at the effect of perturbations in the strong-inte:raction coupling constant may be better described 'Ili th off-shell dynamics, In this model neither the photon-exchange graph nor the feedback effect * can explain tbe'neutron-proton mass difference, but if N exchange ,provides the attractive force to bind the nucleon, then radiative * corrections to the N N~ vertex may e}~lain the sign of m m . , n ; P Evidenc,e is given for the predominance of pseudovector rather thaIl pseudosc~lar rrNN coupling. • UCRL-17329 " -1, ',. ,'". ,

Mass Perturbations in a Bethe-Salpeter-Equation Model of the Nucleon