Measurement of the single-spin asymmetry A y 0 in quasi-elastic 3He↑(e,e′n) scattering at 0.4 < Q2 < 1.0 GeV/c2

Long, E.; Zhang, Y. W.; Mihovilovič, M.; Jin, G.; Sulkosky, V.; Kelleher, A.; Anderson, B.; Higinbotham, D. W.; Širca, S.; Allada, K.; 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.; Deur, A.; Dutta, C.; El Fassi, L.; Flay, D.; Frullani, S.; Garibaldi, F.; Gao, H.; Gilad, S.; Gilman, R.; Glamazdin, O.; Golge, S.; Gomez, J.; Hansen, J. -O.; Holmstrom, T.; Huang, J.; Ibrahim, H.; de Jager, C. W.; Jensen, E.; Jiang, X.; Jones, M.; Kang, H.; Katich, J.; Khanal, H. P.; King, P. M.; Korsch, W.; LeRose, J.; Lindgren, R.; Lu, H. -J.; Luo, W.; Markowitz, P.; Meziane, M.; Michaels, R.; Moffit, B.; Monaghan, P.; Muangma, N.; Nanda, S.; Norum, B. E.; Pan, K.; Parno, D.; Piasetzky, E.; Posik, M.; Punjabi, V.; Puckett, A. J. R.; Qian, X.; Qiang, Y.; Qui, X.; Riordan, S.; Saha, A.; Sawatzky, B.; Shabestari, M.; Shahinyan, A.; Shoenrock, B.; St. John, J.; Subedi, R.; Tobias, W. A.; Tireman, W.; Urciuoli, G. M.; Wang, D.; Wang, K.; Wang, Y.; Watson, J.; Wojtsekhowski, B.; Ye, Z.; Zhan, X.; Zhang, Y.; Zheng, X.; Zhao, B.; Zhu, L.

doi:10.1016/j.physletb.2019.134875

Title: Measurement of the single-spin asymmetry $A_{y}^{0}$ in quasi-elastic 3He↑(e,e′n) scattering at 0.4 < Q2 < 1.0 GeV/c2

Journal Article · Tue Oct 01 00:00:00 EDT 2019 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2019.134875· OSTI ID:1558174

; Zhang, Y. W.; Mihovilovič, M.; Jin, G.; Sulkosky, V.; Kelleher, A.; Anderson, B.; Higinbotham, D. W.; Širca, S.; Allada, K.; Annand, J. R. M.; Averett, T.; Bertozzi, W.; Boeglin, W.; Bradshaw, P.; Camsonne, A.; Canan, M.; Cates, G. D.; Chen, C.; Chen, J. -P. more »

Due to the lack of free neutron targets, studies of the structure of the neutron are typically made by scattering electrons from either ²H or ³He targets. In order to extract useful neutron information from a ³He target, one must understand how the neutron in a ³He system differs from a free neutron by taking into account nuclear effects such as final state interactions and meson exchange currents. The target single spin asymmetry $$A_y^0$$ is an ideal probe of such effects, as any deviation from zero indicates effects beyond plane wave impulse approximation. New measurements of the target single spin asymmetry $$A_y^0$$ at Q² of 0.46 and 0.96 (GeV/c)² were made at Jefferson Lab using the quasi-elastic transversely polarized ³He↑(e,e'n) reaction. Our measured asymmetry decreases rapidly, from >20% at Q² = 0.46(GeV/c)² to nearly zero at Q²=0.96(GeV$/c)², demonstrating the fall-off of the reaction mechanism effects as Q² increases. We also observed a small ϵ-dependent increase in $$A_y^0$$ compared to previous measurements, particularly at moderate Q². This indicates that upcoming high Q² measurements from the Jefferson Lab 12~GeV program can cleanly probe neutron structure from polarized ³He using plane wave impulse approximation.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: NSF-0969129; FG02-96ER41003; AC05-06OR23177

OSTI ID:: 1558174

Alternate ID(s):: OSTI ID: 1564257

Report Number(s):: JLAB-PHY-19-2949; DOE/OR/23177-4693; arXiv:1906.04075; S0370269319305891; 134875; PII: S0370269319305891

Journal Information:: Physics Letters B, Journal Name: Physics Letters B Vol. 797 Journal Issue: C; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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Cited by: 5 works

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