Electric Form Factor of the Neutron from Asymmetry Measurements

The electromagnetic form factors are fundamental quantities containing information on the spatial and momentum distributions of charge and current within the nucleon. While nucleon form factors may be experimentally extracted via purely electromagnetic interactions, the functions encode information regarding the most basic constituents of matter, namely the strongly interacting quarks and gluons, that collectively give rise to the observed properties of the nucleon, e.g. the radius and mass. The form factor ratio of the neutron has been extracted at a negative momentum transfer squared of $Q^2=1.16$ GeV$^2$ via a beam-target helicity asymmetry measurement using the semi-exclusive reaction $^3\vec{\textrm{He}}(\vec{e},e'n)pp$. The Jefferson Lab Hall A experiment E02-013 ran in 2006 utilizing the 6 GeV CEBAF for its high-duty, longitudinally polarized electron beam. The double-arm coincidence experiment detected the quasielastically scattered electrons in a large angular and momentum acceptance spectrometer. The recoiling nucleons were detected and momentum analyzed in a large scintillator-iron based neutron detector. Presented will be the analysis and the results of a new $G_E^n/G_M^n$ extraction at $Q^2$=1.16 GeV$^2$.