Quasifree bremsstrahlung in the $d\overrightarrow{p}\mathrm{dp}\gamma$ reaction above the pion production threshold

Experimental results of the $d\overrightarrow{p}\mathrm{dp}\gamma$ reaction are presented for several observables with deuteron projectile energies between 437 MeV and 559 MeV. The kinematically complete measurements were performed at the CELSIUS storage ring with the PROMICE/WASA setup. Angular and spectral distributions of the charged ejectiles are decomposed into fractions that can be attributed to a quasifree $n\overrightarrow{p}d\gamma$ process with a spectator proton and to a process involving all three nucleons. Within the acceptance of the detector, about two thirds of the events are associated to the quasifree process; the remainder are characterized by substantial transverse momentum components transferred to a participating outgoing proton.