Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58 GeV2 Using the Reaction He−→3(e⃗ ,e′n)pp - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2013

Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58 GeV2 Using the Reaction He−→3(e⃗ ,e′n)pp

B.S. Schlimme
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I. Sick
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J. Yoon
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Résumé

A 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)±0.017(syst).

Dates et versions

hal-00975827 , version 1 (09-04-2014)

Identifiants

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B.S. Schlimme, P. Achenbach, C. A. Ayerbe Gayoso, J. C. Bernauer, R. Böhm, et al.. Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58 GeV2 Using the Reaction He−→3(e⃗ ,e′n)pp. Physical Review Letters, 2013, 111, pp.132504. ⟨10.1103/PhysRevLett.111.132504⟩. ⟨hal-00975827⟩
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