Physical Review Letters
022501 (6 pages)
We studied simultaneously the 4He(e,e′p), 4He (e,e′pp), and 4He( e,e′pn) reactions at Q2 = 2(GeV/c)2 and xB > 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 4He and discussed in the context of probing the elusive repulsive component of the NN force.
Original Publication Citation
Korover, I., Muangma, N., Hen, O., Shneor, R., Sulkosky, V., Kelleher, A., . . . Jefferson Lab Hall, A. C. (2014). Probing the repulsive core of the nucleon-nucleon interaction via the 4He (e,e' Pn) triple-coincidence reaction. Physical Review Letters, 113(2), 022501. doi:10.1103/PhysRevLett.113.022501
Korover, I.; Muangma, N.; Hen, O.; Shneor, R.; Sulkosky, V.; Kelleher, A.; Gilad, S.; Higinbotham, D. W.; Albataineh, H.; and Weinstein, L. B., "Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the 4He( e, e′ pN) Triple-Coincidence Reaction" (2014). Physics Faculty Publications. 206.