Nuclear interaction currents

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Abstract
A procedure for extracting electromagnetic exchange-current operators from a given nucleon-nucleon potential is developed on the basis of the continuity-equation constraint. The present method is applied to the one-boson-exchange nucleon-nucleon potential to yield exchange-current operators. It is shown that the proposed formulas reproduce, up to divergence-free four-currents, both the contact current and the mesonic current derived consistently within the one-boson-exchange model including meson retardation and nucleon recoil.