Measurement of the Electric Form Factor of the Neutron atQ2=0.5and1.0GeV2/c2

The electric form factor of the neutron was determined from measurements of the $\overrightarrow{d}(\overrightarrow{e},e^{\prime }n)p$ reaction for quasielastic kinematics. Polarized electrons were scattered off a polarized deuterated ammonia (${}^{15}\mathrm{N}\mathrm{D}_3$) target in which the deuteron polarization was perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons in a large solid angle detector. We find $G_E^n=0.0526\pm 0.0033(\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{t})\pm 0.0026(\mathrm{s}\mathrm{y}\mathrm{s})$ and $0.0454\pm 0.0054\pm 0.0037$ at $Q^2=0.5$ and $1.0(\mathrm{G}\mathrm{e}\mathrm{V}/c{)}^2$, respectively.