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Korover, Igor; Muangma, Navaphon; Hen, Or; Sulkosky, Vincent; Kelleher, Aidan; Gilad, Shalev; Higinbotham, Douglas; Piasetzky, Eliazer; Wood, Stephen; Rakhman, Abdurahim; Allada, Kalyan; Anez, David; Aniol, Konrad; Annand, John; Armstrong, Whitney; Arrington, John; Averett, Todd; Badman, Toby; Bai, Xinzhan; Beck, Arie; Beck, Sharon; Bellini, Vincenzo; Benmokhtar, Fatiha; Bertozzi, William; Bittner, James; Camsonne, Alexandre; Chirapatpimol, Khem; Cisbani, Evaristo; Daniel, Aji; De, Cornelis; de Jager, C. W.; De, Raffaele; Deconinck, Wouter; Defurne, Maxime; Flay, David; Fomin, Nadia; Frullani, Salvatore; Fuchey, Eric; Gaskell, David; Gilman, Ronald; Glamazdin, Oleksandr; Gu, Chao; Gueye, Paul; Hamilton, David; Hanretty, Charles; Hansen, Jens-Ole; Shabestari, Mitra Hashemi; Iqbal, Sophia; Jin, Ge; Kalantarians, Narbe; Kang, Hoyoung; Khandaker, Mahbubul; LeRose, John; Leckey, John; Lindgren, Richard; Long, Elena; Mammei, Juliette; Margaziotis, Demetrius; Markowitz, Pete; Meziani, Zein -Eddine; Michaels, Robert; Mihovilovic, Miha; Monaghan, Peter; Nuruzzaman, nfn; Pan, Kai; Phillips, Sarah; Pomerantz, Ishay; Posik, Matthew; Punjabi, Vina; Qiang, Yi; Qiu, Xiyu; Reimer, Paul; Riordan, Seamus; Ron, Guy; Rondon-Aramayo, Oscar; Schulte, Elaine; Selvy, Lawrence; Shahinyan, Albert; Sirca, Simon; Sjoegren, Johan; Slifer, Karl; Solvignon-Slifer, Patricia; Sparveris, Nikolaos; Subedi, Ramesh; Tireman, William; Wang, Diancheng; Weinstein, Lawrence; Wojtsekhowski, Bogdan; Yan, Wenbiao; Yaron, Israel; Ye, Zhihong; Zhan, X.; Zhang, J.; Zhang, Yawei; Zhao, Bo; Zhao, Zhiwen; Zheng, Xiaochao; Zhu, Pengjia; Zielinski, Ryan; Watson, John
Physical review letters, 07/2014, Volume: 113, Issue: 2Journal Article
We studied simultaneously the 4He(e,e'p), 4He(e,e'pp), and 4He(e,e'pn) reactions at Q2=2 GeV/c2 and xB >1, for a (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 force is expected to change from predominantly tensor to repulsive. Neutron-proton pairs dominate the high-momentum tail of the nucleon momentum distributions, but their abundance 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 in the range we studied. Our data are compared with ab-initio calculations of two-nucleon momentum distributions in 4He.
