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  • Probing the repulsive core of the nucleon-nucleon interaction via the (4)He(e,e'pN) triple-coincidence reaction
    Korover, I; Muangma, N; Hen, O; Shneor, R; Kelleher, A; Gilad, S; Higinbotham, D W; Watson, J W; Wood, S A; Aguilera, P; Ahmed, Z; Albataineh, H; Allada, K; Anderson, B; Aniol, K; Annand, J; Armstrong, W; Averett, T; Badman, T; Baghdasaryan, H; Bai, X; Beck, A; Beck, S; Bellini, V; Benmokhtar, F; Bertozzi, W; Bittner, J; Boeglin, W; Camsonne, A; Chen, C; Chen, J-P; Cisbani, E; Dalton, M M; Daniel, A; Day, D; de Jager, C W; Deconinck, W; Defurne, M; Flay, D; Fomin, N; Friend, M; Frullani, S; Fuchey, E; Garibaldi, F; Gaskell, D; Gilman, R; Glamazdin, O; Gu, C; Gueye, P; Hanretty, C; Hansen, J-O; Holmstrom, T; Iqbal, S; Jin, G; Kalantarians, N; Kang, H; Khandaker, M; LeRose, J; Leckey, J; Lindgren, R; Long, E; Mammei, J; Margaziotis, D J; Markowitz, P; Marti Jimenez-Arguello, A; Meekins, D; Meziani, Z; Michaels, R; Mihovilovic, M; Monaghan, P; Munoz Camacho, C; Norum, B; Nuruzzaman; Pan, K; Phillips, S; Pomerantz, I; Punjabi, V; Qiu, X; Rakhman, A; Riordan, S; Rondon-Aramayo, O; Saha, A; Schulte, E; Selvy, L; Shahinyan, A; Sirca, S; Sjoegren, J; Solvignon, P; Sparveris, N; Subedi, R; Weinstein, L B; Yan, W; Ye, Z; Zhan, X; Zhang, J; Zhang, Y; Zhao, Z; Zheng, X; Zhu, P; Zielinski, R

    Physical review letters, 2014-Jul-11, 20140711, Volume: 113, Issue: 2
    Journal Article

    We studied simultaneously the (4)He(e,e'p), (4)He(e,e'pp), and (4)He(e,e'pn) reactions at Q(2)=2(GeV/c)(2) and x(B)>1, for an (e,e'p) missing-momentum range of 400 to 830  MeV/c. The knocked-out proton was detected in coincidence with a proton or neutron recoiling almost back to back to the missing momentum, leaving the residual A=2 system at low excitation energy. These data were used to identify two-nucleon short-range correlated pairs and to deduce their isospin structure as a function of missing momentum, in a region where the nucleon-nucleon (NN) force is expected to change from predominantly tensor to repulsive. The abundance of neutron-proton pairs is reduced as the nucleon momentum increases beyond ∼500  MeV/c. The extracted fraction of proton-proton pairs is small and almost independent of the missing momentum. Our data are compared with calculations of two-nucleon momentum distributions in (4)He and discussed in the context of probing the elusive repulsive component of the NN force.

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