Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the [superscript 4]He(e,e'pN) Triple-Coincidence Reaction
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PhysRevLett.113.022501.pdf
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Author(s)
Korover, I.
Muangma, Navaphon
Hen, O.
Shneor, R.
Sulkosky, V.
Kelleher, A.
Higinbotham, D. W.
Piasetzky, E.
Watson, J. W.
Wood, S. A.
Date Issued
July 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Korover, I., N. Muangma, O. Hen, R. Shneor, V. Sulkosky, A. Kelleher, S. Gilad, et al. “Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the [superscript 4]He(e,e'pN) Triple-Coincidence Reaction.” Physical Review Letters 113, no. 2 (July 2014). © 2014 American Physical Society
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Final published version
Abstract
We studied simultaneously the [superscript 4]He(e,e'p), [superscript 4]He(e,e'pp), and [superscript 4]He(e,e'pn) reactions at Q[superscript 2] = 2(GeV/c)[superscript 2] and x[subscript B] > 1, for an (e,e'p) missing-momentum range of 400 to 830 MeV/c. The knocked-out proton was detected in coincidence with a proton or neutron recoiling almost back to back to the missing momentum, leaving the residual A = 2 system at low excitation energy. These data were used to identify two-nucleon short-range correlated pairs and to deduce their isospin structure as a function of missing momentum, in a region where the nucleon-nucleon (NN) force is expected to change from predominantly tensor to repulsive. The abundance of neutron-proton pairs is reduced as the nucleon momentum increases beyond ∼500 MeV/c. The extracted fraction of proton-proton pairs is small and almost independent of the missing momentum. Our data are compared with calculations of two-nucleon momentum distributions in [superscript 4]He and discussed in the context of probing the elusive repulsive component of the NN force.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.022501
