Measurement of the Charge Form Factor of the Neutron $G^{E}_{n}$ from ${\vec{d}(\vec{e},e'n)p}$ at $Q^{2}=0.5$ and $1.0 (GeV/c)^{2}$

Abstract

We determined the electric form factor of the neutron $G_E^n$ via the reaction ${\vec{d}(\vec{e},e'n)p}$ using a longitudinally polarized electron beam and a frozen, polarized $^{15}ND_3$ target at Jefferson Lab. The knocked out neutrons were detected in a segmented plastic scintillator in coincidence with the quasi-elastically scattered electrons which were tracked in Hall C's High Momentum Spectrometer. To extract $G_E^n$, we compared the experimental beam--target asymmetry with theoretical calculations based on different $G_E^n$ models. We report the preliminary results of the fall 2001 run at $Q^{2}=0.5$ and $1.0 (GeV/c)^{2}$.