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