Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the [superscript 4]He(e,e'pN) Triple-Coincidence Reaction

Probing the Repulsive Core of the Nucleon-Nucleon Interaction via the [superscript 4]He(e,e'pN) Triple-Coincidence Reaction

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 w...

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Bibliographic Details
Main Authors: Korover, I., Muangma, Navaphon, Hen, O., Shneor, R., Sulkosky, V., Kelleher, A., Higinbotham, D. W., Piasetzky, E., Watson, J. W., Wood, S. A., Aguilera, P., Ahmed, Z., Albataineh, H., Allada, Kalyan C., Anderson, B., Anez, D., Aniol, K., Annand, J., Armstrong, W., Arrington, J., Averett, T., Badman, T., Baghdasaryan, H., Bai, X., Beck, A., Beck, S., Bellini, V., Benmokhtar, F., Bittner, J., Boeglin, W., Camsonne, A., Chen, C., Chen, J.-P., Chirapatpimol, K., Cisbani, E., Dalton, M. M., Daniel, A., Day, D., de Jager, C. W., De Leo, R., Deconinck, Wouter, Defurne, M., Flay, D., Fomin, N., Friend, M., Frullani, S., Fuchey, E., Garibaldi, F., Gaskell, D., Gilman, R., Glamazdin, O., Gu, C., Gueye, P., Hamilton, D., Hanretty, C., Hansen, J.-O., Hashemi Shabestari, M., Holmstrom, T., Huang, M., Iqbal, S., Jin, G., Kalantarians, N., Kang, H., Khandaker, M., LeRose, J. J., Leckey, J., Lindgren, R., Long, E., Mammei, J., Margaziotis, D. J., Markowitz, P., Marti Jimenez-Arguello, A., Meekins, D., Meziani, Z.-E., Michaels, R., Mihovilovic, M., Monaghan, Peter, Munoz Camacho, C., Norum, B. E., Nuruzzaman, N., Phillips, S., Pomerantz, I., Posik, M., Punjabi, V., Qian, X., Qiang, Y., Qiu, X., Rakhman, A., Reimer, P. E., Riordan, S., Ron, G., Rondon-Aramayo, O., Saha, A., Schulte, E., Selvy, L., Shahinyan, A., Sirca, S., Sjoegren, J., Slifer, K., Solvignon, P., Sparveris, N., Subedi, R., Tireman, W., Wang, D., Weinstein, L. B., Wojtsekhowski, B., Yan, W., Yaron, I., Ye, Z., Zhan, X., Zhang, J., Zhang, Y., Zhao, B., Zhao, Z., Zheng, X., Zhu, P., Zielinski, R., Silad, Shalev, Bertozzi, William, Gilad, Shalev, Pan, Kai, Ph. D. Massachusetts Institute of Technology
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: American Physical Society 2014
Online Access:http://hdl.handle.net/1721.1/88614
https://orcid.org/0000-0001-9930-5063
https://orcid.org/0000-0003-2713-7800
Description
Summary: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.

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