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Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

  • Author(s): Cruz-Torres, R;
  • Li, S;
  • Hauenstein, F;
  • Schmidt, A;
  • Nguyen, D;
  • Abrams, D;
  • Albataineh, H;
  • Alsalmi, S;
  • Androic, D;
  • Aniol, K;
  • Armstrong, W;
  • Arrington, J;
  • Atac, H;
  • Averett, T;
  • Ayerbe Gayoso, C;
  • Bai, X;
  • Bane, J;
  • Barcus, S;
  • Beck, A;
  • Bellini, V;
  • Bhatt, H;
  • Bhetuwal, D;
  • Biswas, D;
  • Blyth, D;
  • Boeglin, W;
  • Bulumulla, D;
  • Camsonne, A;
  • Castellanos, J;
  • Chen, JP;
  • Cohen, EO;
  • Covrig, S;
  • Craycraft, K;
  • Dongwi, B;
  • Duer, M;
  • Duran, B;
  • Dutta, D;
  • Fuchey, E;
  • Gal, C;
  • Gautam, TN;
  • Gilad, S;
  • Gnanvo, K;
  • Gogami, T;
  • Gomez, J;
  • Gu, C;
  • Habarakada, A;
  • Hague, T;
  • Hansen, O;
  • Hattawy, M;
  • Hen, O;
  • Higinbotham, DW;
  • Hughes, E;
  • Hyde, C;
  • Ibrahim, H;
  • Jian, S;
  • Joosten, S;
  • Karki, A;
  • Karki, B;
  • Katramatou, AT;
  • Keppel, C;
  • Khachatryan, M;
  • Khachatryan, V;
  • Khanal, A;
  • King, D;
  • King, P;
  • Korover, I;
  • Kutz, T;
  • Lashley-Colthirst, N;
  • Laskaris, G;
  • Li, W;
  • Liu, H;
  • Liyanage, N;
  • Lonardoni, D;
  • Machleidt, R;
  • Marcucci, LE;
  • Markowitz, P;
  • McClellan, RE;
  • Meekins, D;
  • Mey-Tal Beck, S;
  • Meziani, ZE;
  • Michaels, R;
  • Mihovilovič, M;
  • Nelyubin, V;
  • Nuruzzaman, N;
  • Nycz, M;
  • Obrecht, R;
  • Olson, M;
  • Ou, L;
  • Owen, V;
  • Pandey, B;
  • Pandey, V;
  • Papadopoulou, A;
  • Park, S;
  • Patsyuk, M;
  • Paul, S;
  • Petratos, GG;
  • Piasetzky, E;
  • Pomatsalyuk, R;
  • Premathilake, S;
  • Puckett, AJR;
  • Punjabi, V
  • et al.
Abstract

We report the first measurement of the (e,e′p) reaction cross-section ratios for Helium-3 (He3), Tritium (H3), and Deuterium (d). The measurement covered a missing momentum range of 40≤pmiss≤550MeV/c, at large momentum transfer (〈Q2〉≈1.9 (GeV/c)2) and xB>1, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for He3/d and H3/d extend to just above the typical nucleon Fermi-momentum (kF≈250 MeV/c) and differ from each other by ∼20%, while for He3/H3 they agree within the measurement accuracy of about 3%. At momenta above kF, the measured He3/H3 ratios differ from the calculation by 20%−50%. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the He3/H3 cross-section ratio for this measurement by less than 5%. If these calculations are correct, then the differences at large missing momenta between the He3/H3 experimental and calculated ratios could be due to the underlying NN interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the NN interaction.

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