Probing the DeltaNN component of 3He

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  • 1 December 1999
Abstract
The 3He(gamma,pi^+/- p) reactions were measured simultaneously over a tagged photon energy range of 800<E_gamma<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. We infer a DeltaNN probability in the 3He ground state of 2.2+/-1.3%.

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