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The contribution of the two-body exchange current is investigated for thereaction of the deuteron photodisintegration in the framework of theBethe-Salpeter formalism and with using extended Siegert theorem. This theoremallow to express the reaction amplitude in terms of extended electric andmagnetic dipole moments of the system. The resultant analytical expression isfaultless with respect to both translation and gauge invariance. It permits toperform calculations of the deuteron photodisintegration cross section andpolarization observables taking into account two-body exchange currentimplicitly.

Extended Siegert Theorem in the Relativistic Investigation of the Deuteron Photodisintegration Reaction