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  • Measurement of the neutron F2 structure function via spectator tagging with CLAS
    Tkachenko, S; Zhang, J; Bosted, P; Christy, M E; Griffioen, K A; Keppel, C E; Kuhn, S E; Tvaskis, V; Adhikari, K P; Adikaram, D; Aghasyan, M; Amaryan, M J; Avakian, H; Baghdasaryan, H; Battaglieri, M; Biselli, A S; 5 D Branford; Briscoe, W J; Brooks, W K; Cole, P L; Contalbrigo, M; Crede, V; D'Angelo, A; Daniel, A; Dashyan, N; Deur, A; Djalali, C; Dodge, G; Domingo, J; Doughty, D; Dutta, D; Egiyan, H; A El Alaoui; L El Fassi; Elouadrhiri, L; Fedotov, G; Fegan, S; Fradi, A; Gabrielyan, M Y; Gevorgyan, N; Gilfoyle, G P; Giovanetti, K L; Gohn, W; Gothe, R W; Guidal, M; Guo, L; Hafidi, K; Hungerford, E; Ireland, D G; Ispiryan, M; Jawalkar, S S; Jo, H S; Kalantarians, N; Khandaker, M; Khetarpal, P; Kim, A; Kim, W; King, P M; Klein, F J; Klimenko, A; Kubarovsky, V; Kuleshov, S V; Livingston, K; Lu, H Y; Markov, N; McKinnon, B; Mineeva, T; Moutarde, H; Nadel-Turonski, P; Niccolai, S; Niculescu, G; Osipenko, M; Pappalardo, L; Park, K; Park, S; Pasyuk, E; Price, J W; Prok, Y; Protopopescu, D; Raue, B A; Ricco, G; Ripani, M; Rosner, G; Sabatie, F; Saini, M S; Salgado, C; Seder, E; Sharabian, Y G; Sober, D I; Sokhan, D; Stepanyan, S S; Strauch, S; Tang, W; Ungaro, M; Vineyard, M F; Voutier, E; Watts, D P; Weinstein, L B; Weygand, D P; Zhao, B

    arXiv.org, 05/2012
    Paper, Journal Article

    We report on the first measurement of the F2 structure function of the neutron from semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the backward hemisphere. Restricting the momentum of the spectator protons to < 100 MeV and their angles to < 100 degrees relative to the momentum transfer allows an interpretation of the process in terms of scattering from nearly on-shell neutrons. The F2n data collected cover the nucleon resonance and deep-inelastic regions over a wide range of Bjorken x for 0.65 < Q2 < 4.52 GeV2, with uncertainties from nuclear corrections estimated to be less than a few percent. These measurements provide the first determination of the neutron to proton structure function ratio F2n/F2p at 0.2 < x < 0.8 with little uncertainty due to nuclear effects.

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