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Article
Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements
Physical Letters B
(2019)
Abstract
We report the first measurement of the (e, e p) reaction cross-section ratios for Helium-3 ( 3He), Tritium ( 3H), and Deuterium (d). The measurement covered a missing momentum range of 40 ≤ pmiss ≤ 550 MeV/c, at large momentum transfer (Q 2 ≈ 1.9 (GeV/c)2) and xB > 1, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with planewave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for 3He/d and 3H/d extend to just above the typical nucleon Fermi-momentum (kF ≈ 250 MeV/c) and differ from each other by ∼ 20%, while for 3He/3H they agree within the measurement accuracy of about 3%. At momenta above kF , the measured 3He/3H ratios differ from the calculation by 20% − 50%. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the 3He/3H cross-section ratio for this measurement by less than 5%. If these calculations are correct, then the differences at large missing momenta between the 3He/3H experimental and calculated ratios could be due to the underlying N N interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the N N interaction
Disciplines
Publication Date
October, 2019
DOI
https://doi.org/10.1016/j.physletb.2019.134890
Citation Information
Todd Averett and Jefferson Lab Hall A Tritium Collaboration. "Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements" Physical Letters B Vol. 797 (2019) Available at: http://works.bepress.com/todd-averett/41/