Probing the DeltaNN component of 3He

The He-3(gamma, pi(+/-)p) reactions were measured simultaneously over a tagged photon energy range of 800 less than or equal to E gamma less than or equal to 1120 MeV, well above the Delta resonance region. An analysis was performed to kinematically isolate Delta knockout events from conventional Delta photoproduction events, and a statistically significant excess of pi(+)p events was identified, consistent with Delta(++) knockout. Two methods were used to estimate the Delta NN probability in the He-3 ground state corresponding to the observed knockout cross section. The first gave a lower probability limit of 1.5 +/- 0.6 +/- 0.5%; the second yielded an upper limit of about 2.6%.