학술논문
Comparing proton momentum distributions in $A=2$ and 3 nuclei via $^2$H $^3$H and $^3$He $(e, e'p)$ measurements
Document Type
Working Paper
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.; Gayoso, C. Ayerbe; 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, J. -P.; Cohen, E. O.; Covrig, S.; Craycraft, K.; Dongwi, B.; Duer, M.; Duran, B.; Dutta, D.; Fuchey, E.; Gal, C.; Gautam, T. N.; Gilad, S.; Gnanvo, K.; Gogami, T.; Gomez, J.; Gu, C.; Habarakada, A.; Hague, T.; Hansen, O.; Hattawy, M.; Hen, O.; Higinbotham, D. W.; Hughes, E.; Hyde, C.; Ibrahim, H.; Jian, S.; Joosten, S.; Karki, A.; Karki, B.; Katramatou, A. T.; 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, L. E.; Markowitz, P.; McClellan, R. E.; Meekins, D.; Beck, S. Mey-Tal; Meziani, Z. -E.; Michaels, R.; Mihovilovic, 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, G. G.; Piasetzky, E.; Pomatsalyuk, R.; Premathilake, S.; Puckett, A. J. R.; Punjabi, V.; Ransome, R.; Rashad, M. N. H.; Reimer, P. E.; Riordan, S.; Roche, J.; Sammarruca, F.; Santiesteban, N.; Sawatzky, B.; Segarra, E. P.; Schmookler, B.; Shahinyan, A.; Širch, S.; Sparveris, N.; Su, T.; Suleiman, R.; Szumila-Vance, H.; Tadepalli, A. S.; Tang, L.; Tireman, W.; Tortorici, F.; Urciuoli, G.; Viviani, M.; Weinstein, L. B.; Wojtsekhowski, B.; Wood, S.; Ye, Z. H.; Ye, Z. Y.; Zhang, J.
Source
Physics Letters B 797 (2019) 134890
Subject
Language
Abstract
We report the first measurement of the $(e,e'p)$ reaction cross-section ratios for Helium-3 ($^3$He), Tritium ($^3$H), and Deuterium ($d$). The measurement covered a missing momentum range of $40 \le p_{miss} \le 550$ MeV$/c$, at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV$/c$)$^2$) and $x_B>1$, 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 $^3$He$/d$ and $^3$H$/d$ extend to just above the typical nucleon Fermi-momentum ($k_F \approx 250$ MeV$/c$) and differ from each other by $\sim 20\%$, while for $^3$He/$^3$H they agree within the measurement accuracy of about 3\%. At momenta above $k_F$, the measured $^3$He/$^3$H ratios differ from the calculation by $20\% - 50\%$. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the $^3$He/$^3$H cross-section ratio for this measurement by less than 5\%. If these calculations are correct, then the differences at large missing momenta between the $^3$He/$^3$H 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.
Comment: 8 pages, 3 figures (4 panels)
Comment: 8 pages, 3 figures (4 panels)