Measurement of the single-spin asymmetry $A_y^0$ in quasi-elastic $^3$He$^\uparrow$($e,e'n$) scattering at $0.4 &lt; Q^2 &lt; 1.0$ GeV$/c^2$
Creators: name: Long, E.
name: Zhang, Y. W.
name: Mihoviloviv, M.
name: Jin, G.
name: Sulkosky, V.
name: Kelleher, A.
name: Anderson, B.
name: Higinbotham, D. W.
name: Sirca, S.
name: Allada, K.
name: Annand, J. R. M.
name: Averett, T.
name: Bertozzi, W.
name: Boeglin, W.
name: Bradshaw, P.
name: Camsonne, A.
name: Canan, M.
name: Cates, G. D.
name: Chen, C.
name: Chen, J. -P.
name: Chudakov, E.
name: De Leo, R.
name: Deng, X.
name: Deur, A.
name: Dutta, C.
name: Fassi, L. El
name: Flay, D.
name: Frullani, S.
name: Garibaldi, F.
name: Gao, H.
name: Gilad, S.
name: Gilman, R.
name: Glamazdin, O.
name: Golge, S.
name: Gomez, J.
name: Hansen, J. -O.
name: Holmstrom, T.
name: Huang, J.
name: Ibrahim, H.
name: de Jager, C. W.
name: Jensen, E.
name: Jiang, X.
name: Jones, M.
name: Kang, H.
name: Katich, J.
name: Khanal, H. P.
name: King, P. M.
name: Korsch, W.
name: LeRose, J.
name: Lindgren, R.
name: Lu, H. -J.
name: Luo, W.
name: Markowitz, P.
name: Meziane, M.
name: Michaels, R.
name: Moffit, B.
name: Monaghan, P.
name: Muangma, N.
name: Nanda, S.
name: Norum, B. E.
name: Pan, K.
name: Parno, D.
name: Piasetzky, E.
name: Posik, M.
name: Punjabi, V.
name: Puckett, A. J. R.
name: Qian, X.
name: Qiang, Y.
name: Qui, X.
name: Riordan, S.
name: Saha, A.
name: Sawatzky, B.
name: Shabestari, M.
name: Shahinyan, A.
name: Shoenrock, B.
name: John, J. St.
name: Subedi, R.
name: Tobias, W. A.
name: Tireman, W.
name: Urciuoli, G. M.
name: Wang, D.
name: Wang, K.
name: Wang, Y.
name: Watson, J.
name: Wojtsekhowski, B.
name: Ye, Z.
name: Zhan, X.
name: Zhang, Y.
name: Zheng, X.
name: Zhao, B.
name: Zhu, L.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Due to the lack of free neutron targets, studies of the structure of the neutron are typically made by scattering electrons from either $^2$H or $^3$He targets. In order to extract useful neutron information from a $^3$He target, one must understand how the neutron in a $^3$He 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 $Q^2$ of 0.46 and 0.96 (GeV/$c)^2$ were made at Jefferson Lab using the quasi-elastic $^3\mathrm{He}^{\uparrow}(e,e'n)$ reaction. Our measured asymmetry decreases rapidly, from $&gt;20\%$ at $Q^2=0.46$ (GeV/$c)^2$ to nearly zero at $Q^2=0.96$ (GeV$/c)^2$, demonstrating the fall-off of the reaction mechanism effects as $Q^2$ increases. We also observed a small $ε$-dependent increase in $A_y^0$ compared to previous measurements, particularly at moderate $Q^2$. This indicates that upcoming high $Q^2$ measurements from the Jefferson Lab 12 GeV program can cleanly probe neutron structure from polarized $^3$He using plane wave impulse approximation.
description: 6 pages, 5 figures