Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58 GeV2 Using the Reaction He−→3(e⃗ ,e′n)pp
- Schlimme, B.S.
- Achenbach, P.
- Ayerbe Gayoso, C. A.
- Bernauer, J. C.
- Böhm, R.
- Bosnar, D.
- Challand, T.
- Distler, M.O.
- Doria, L.
- Fellenberger, F.
- Fonvieille, H.
- Gómez Rodríguez, M.
- Grabmayr, P.
- Hehl, T.
- Heil, W.
- Kiselev, D.
- Krimmer, J.
- Makek, M.
- Merkel, H.
- Middleton, D. G.
- Müller, U.
- Nungesser, L.
- Ott B., A.
- Pochodzalla, J.
- Potokar, M.
- Sánchez Majos, S.
- Sargsian M., M.
- Sick, I.
- Širca, S.
- Weinriefer, M.
- Wendel, M.
- Yoon, J.
DOIAbstract
International audienceA measurement of beam helicity asymmetries in the reaction He−→3(e⃗ ,e′n)pp is performed at the Mainz Microtron in quasielastic kinematics to determine the electric to magnetic form factor ratio of the neutron GnE/GnM at a four-momentum transfer Q2=1.58 GeV2. Longitudinally polarized electrons are scattered on a highly polarized He3 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 GnE/GnM from a double ratio. We find μnGnE/GnM=0.250±0.058(stat)±0.01...
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