arXiv · 1401.6138
Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the 4He(e,e'pN) Triple-Coincidence Reaction
Abstract
We studied simultaneously the 4He(e,e'p), 4He(e,e'pp), and 4He(e,e'pn) reactions at Q^2=2 [GeV/c]2 and x_B>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.
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I. Korover N. Muangma, O. Hen, R. Shneor, V. Sulkosky, A. Kelleher, S. Gilad, D. W. Higinbotham, E. Piasetzky J. Watson, S. Wood, Abdurahim Rakhman, P. Aguilera, Z. Ahmed, H. Albataineh, K. Allada, B. Anderson, D. Anez, K. Aniol, J. Annand, W. Armstrong, J. Arrington, T. Averett, T. Badman, H. Baghdasaryan, X. Bai, A. Beck, S. Beck, V. Bellini, F. Benmokhtar, W. Bertozzi, J. Bittner, W. Boeglin, A. Camsonne, C. Chen, J. -P. Chen, K. Chirapatpimol, E. Cisbani, M. M. Dalton, A. Daniel, D. Day, C. W. de Jager, R. De Leo, W. Deconinck, M. Defurne, D. Flay, N. Fomin, M. Friend, S. Frullani, E. Fuchey, F. Garibaldi, D. Gaskell, R. Gilman, O. Glamazdin, C. Gu, P. Gueye, D. Hamilton, C. Hanretty, O. Hansen, M. Hashemi Shabestari, T. Holmstrom, M. Huang, S. Iqbal, G. Jin, N. Kalantarians, H. Kang, M. Khandaker, J. LeRose, J. Leckey, R. Lindgren, E. Long, J. Mammei, D. J. Margaziotis, P. Markowitz, A. Marti Jimenez-Arguello, D. Meekins, Z. Meziani, R. Michaels, M. Mihovilovic, P. Monaghan, C. Munoz Camacho, B. Norum, Nuruzzaman, K. Pan, S. Phillips, I. Pomerantz, M. Posik, V. Punjabi, X. Qian, Y. Qiang, X. Qiu, P. E. Reimer, S. Riordan, G. Ron, O. Rondon-Aramayo, A. Saha, E. Schulte, L. Selvy, A. Shahinyan, S. Sirca, J. Sjoegren, K. Slifer. 2014-01-23. Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the 4He(e,e'pN) Triple-Coincidence Reaction. https://doi.org/10.1103/physrevlett.113.022501
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