Comparing proton momentum distributions in A = 2 and 3 nuclei via [superscript 2]H [superscript 3]H and [superscript 3]He (e,e′p) measurements
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Description
Published version
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495.26 KB
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Author(s)
Cruz Torres, Reynier
Schmidt, A.
Beck, Arie
Gilad, Shalev
Hen, Or
Laskaris, Georgios
Beck, S. May-Tal
Ou, Longwu
Papadopoulou, A.
Patsyuk, Maria
Date Issued
August 2019
Journal
Physics Letters B
Publisher
Elsevier BV
Citation
Cruz-Torres, R. et al. "Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e, e'p) measurements" Physics Letter B 797 (August 2019): 134890 © 2019 The Author(s)
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1016/J.PHYSLETB.2019.134890
