期刊
PHYSICS LETTERS B
卷 788, 期 -, 页码 117-121出版社
ELSEVIER
DOI: 10.1016/j.physletb.2018.10.063
关键词
Double-polarization asymmetry; Helium-3 nucleus; Proton knock-out
资金
- National Science Foundation
- U.S. Department of Energy
- U.S. DOE [DE-AC05-06OR23177]
- Slovenian Research Agency [P1-0102]
- Polish National Science Centre [2016/22/M/ST2/00173, 2016/21/D/ST2/01120]
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. (C) 2018 The Author. Published by Elsevier B.V.
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