The $^3\mbox{He}(e,e'n)$ Channel in A$_y$ and G$_E$$^n$ Measurements

ORAL

Abstract

Experiments E05-102 and E08-005 involved measurements of electron scattering from polarized $^3$He reactions that have been conducted in Jefferson Lab's Hall A this past year. E08-005 measured the Target Single-Spin Asymmetry A$_y$ in the quasi-elastic $^3\mbox{He}^\uparrow(e,e'n)$ reaction. Plane wave impulse approximation (PWIA) predicts that A$_y$ should be exactly zero. A previous experiment at Q$^2$ of 0.2 (GeV/c)$^2$, where Laget and Nagorny predict A$_y$ to be small, showed a large asymmetry as predicted by Faddeev calculations. The recent experiment measured this asymmetry at Q$^2$ of 0.1 (GeV/c)$^2$, 0.5 (GeV/c)$^2$ and 1.0 (GeV/c)$^2$. This is the first measurement of A$_y$ at large Q$^2$, which is another region where A$_y$ is expected to be small. Any non-zero result is an indication of effects beyond impulse approximation. During E05-102, a parasitic measurement of the electric form factor of the neutron (G$_E$$^n$) was taken using the $^3\vec{\mbox{He}}(\vec{e},e'n)$ channel at Q$^2$ of 0.4 (GeV/c)$^2$, 0.5 (GeV/c)$^2$ and 1.0 (GeV/c)$^2$. An overview of these measurements will be presented.

Authors

  • Elena Long

    Kent State University