ReactionD(γ,pp)π−for High Values of the Emitted Nucleon Momenta

By detecting in coincidence the two emitted protons, we have studied the reaction $\mathrm{D}(\gamma ,pp){\pi }^{-}$ in a kinematical region where the pion-nucleon single-rescattering mechanism is dominant. We have also observed the onset of the photoproduction of two pions on one nucleon followed by the reabsorption of one of them by the other nucleon.