Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58 GeV2 Using the Reaction 3He→(e→, e′n)pp
- Schlimme, B. S.
- Achenbach, P.
- Ayerbe Gayoso, C. A.
- Bernauer, J. C.
- Bohm, R.
- Bosnar, Damir
- Challand, Th.
- Distler, M. O.
- Doria, L.
- Fellenberger, F.
- Fonvieille, H.
- Gomez Rodriguez, M.
- Grabmayr, P.
- Hehl, T.
- Heil, W.
- Kiselev, D.
- Krimmer, J.
- Makek, Mihael
- Merkel, H.
- Middleton, D. G.
- Muller, U.
- Nungesser, L.
- Ott, B. A.
- Pochodzalla, J.
- Potokar, M.
- Sanchez Majos, S.
- Sargsian, M. M.
- Sick, I.
- Širca, S.
- Weinriefer, M.
- Wendel, M.
- Yoon, C. J.
Publication date
January 2013
DOI Publisher
American Physical Society (APS)Abstract
A measurement of beam helicity asymmetries in the reaction 3He→(e→, e′n)pp is performed at the Mainz Microtron in quasielastic kinematics to determine the electric to magnetic form factor ratio of the neutron GEn/GMn at a four-momentum transfer Q2=1.58 GeV2. Longitudinally polarized electrons are scattered on a highly polarized 3He gas target. The scattered electrons are detected with a high-resolution magnetic spectrometer, and the ejected neutrons are detected with a dedicated neutron detector composed of scintillator bars. To reduce systematic errors, data are taken for four different target polarization orientations allowing the determination of GEn/GMn from a double ratio. We find μnGEn/GMn=0.250±0.058(stat)±0.017(syst)
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