Abstract
A relativistic description of isobar configurations in the two-nucleon system is obtained by phe-nomenologically extending the Bethe-Salpeter-equation to channels comprising configurations of internally excited nucleons. The generalized equation is then reduced by standard methods to a three-dimensional relativistic equation. Various possible off-mass-shell extrapolations involved in this reduction are discussed. The best choice seems to be where the relative energy of the two particles is fixed to zero. Then all diagonal and transition OBE-interactions do not contain any retardation and have the normal Yukawa range.
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