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Probing the DeltaNN component of 3He

  • Huber, G. M.
  • Lolos, G. J.
  • Brash, E. J.
  • Dumalski, S.
  • Farzanpay, F.
  • Iurescu, M.
  • Papandreou, Z.
  • Shinozaki, A.
  • Weinerman, A.
  • Emura, T.
  • Hirosawa, H.
  • Niwa, K.
  • Yamashita, H.
  • Maeda, K.
  • Terasawa, T.
  • Yamazaki, H.
  • Endo, S.
  • Miyamoto, K.
  • Sumi, Y.
  • Garino, G.
  • And 6 more
Published Article
Publication Date
Apr 14, 2000
Submission Date
Dec 01, 1999
DOI: 10.1103/PhysRevC.62.044001
arXiv ID: nucl-ex/9912001
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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. Two methods were used to estimate the DeltaNN probability in the 3He 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%.

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