Measurement of double-polarization asymmetries in the quasi-elastic 3(H) over arrowe((e) over arrow, e′p) process

作者：Mihovilovic, M.; Jin, G.; Long, E.; Zhang, Y. -W.; Allada, K.; Anderson, B.; Annand, J. R. M.; Averett, T.; Bertozzi, W.; Boeglin, W.; Bradshaw, P.; Camsonne, A.; Canan, M.; Cates, G. D.; Chen, C.; Chen, J. P.; Chudakov, E.; De Leo, R.; Deng, X.; Deltuva, A.; Deur, A.; Dutta, C.; El Fassi, L.; Flay, D.; Frullani, S.; Garibaldi, F.; Gao, H.; Gilad, S.; Gilman, R.; Glamazdin, O.; Golak, J.; Golge, S.; Gomez, J.; Hansen, O.; Higinbotham, D. W.; Holmstrom, T.; Huang, J.; Ibrahim, H.

来源：Physics Letters B, 2019, 788: 117-121.

DOI：10.1016/j.physletb.2018.10.063

• Double-polarization asymmetry
• Helium-3 nucleus
• Proton knock-out

We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of He-3 proceeding to pd and ppn final states, performed in quasi-elastic kinematics at Q(2) = 0.25 (GeV/c)(2) for missing momenta up to 250 MeV/c. These observables represent highly sensitive tools to investigate the electromagnetic and spin structure of He-3 and the relative importance of two- and three-body effects involved in the breakup reaction dynamics. The measured asymmetries cannot be satisfactorily reproduced by state-of-the-art calculations of He-3 unless their three-body segment is adjusted, indicating that the spin-dependent part of the nuclear interaction governing the three-body breakup process is much smaller than previously thought.

• 出版日期2019-1-10
• 单位兰州大学; MIT; 黄山学院; Los Alamos; rutgers