Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.022501
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Funding
- Israel Science Foundation
- U.S. National Science Foundation
- U.S. Department of Energy [DE-AC02-06CH11357, DE-FG02-94ER40818]
- U.S. DOE [DE-AC05-060R23177]
- STFC [ST/J000175/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [1306126] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1307340, 1305536, 1206053] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/J000175/1] Funding Source: researchfish
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We studied simultaneously the He-4(e,e'p), He-4(e,e'pp), and He-4(e,e'pn) reactions at Q(2) 2(GeV/c)(2) and x(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 similar to 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 He-4 and discussed in the context of probing the elusive repulsive component of the NN force.
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