The electric form factor of the neutron was determined from studies of the reaction 3He⃗(e⃗,e′n)pp in quasielastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the Q2 range over which it is known, we find GEn=0.0236±0.0017(stat)±0.0026(syst), 0.0208±0.0024±0.0019, and 0.0147±0.0020±0.0014 for Q2=1.72, 2.48, and 3.41 GeV2, respectively.
Riordan, S. and Holmstrom, Timothy, "Measurements of the Electric Form Factor of the Neutron up to Q(2)=3.4 GeV2 Using the Reaction (3)(He)over-right-arrowe((e)over-right-arrow, e ' n)pp" (2010). Chemistry and Physics Faculty Publications. 22.
Phys. Rev. Lett. 105, 262302