Intrinsic operators for the electromagnetic nuclear current
  The intrinsic electromagnetic nuclear meson exchange charge and current operators arising from a separation of the center-of-mass motion are derived for a one-boson-exchange model for the nuclear interaction with scalar, pseudoscalar and vector meson exchange including leading order relativistic terms. Explicit expressions for the meson exchange operators corresponding to the different meson types are given in detail for a two-nucleon system. These intrinsic operators are to be evaluated between intrinsic wave functions in their center-of-mass frame. 
J. Adam, Jr. (TJNAF, Newport News, VA, USA) and H. Arenhoevel (Mainz,   Germany)