Isovector Electromagnetic Exchange Currents and the Nucleon-Nucleon Interaction

A method of projecting out the parts of the tensor- and spin-spin components of the nucleon-nucleon interaction that correspond to isospin 1 pseudoscalar and vector exchanges is given. From those potential components the isovector exchange current operators of main importance in magnetic electron scattering may be constructed. The resulting exchange current operators satisfy the continuity equation with the interaction potential. By using them in place of the usual single-meson exchange current operators consistency between the current operators and the wavefunctions used in evaluating matrix elements for nuclear electromagnetic reactions can be achieved. The utility of the results is illustrated for the case of backward electrodisintegration of deuterium and radiative np-capture.

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