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HK: Fachverband Hadronen und Kerne
HK 13: Hadron Structure and Spectroscopy I
HK 13.7: Talk
Monday, March 16, 2009, 18:00–18:15, H-ZO 20
Measurement of the neutron electric form factor in the reaction 3He→(e→,e′n)pp — •Björn Sören Schlimme — Institut für Kernphysik, Universität Mainz, J.-J.-Becher-Weg 45, D-55099 Mainz
The neutron electric form factor Gen was measured in a double polarization experiment at Q2=1.58 (GeV/c)2. The 1.5 GeV polarized electron beam was provided by the new accelerator stage of the Mainz Mikrotron, MAMI-C. A polarized 3He gas target served as an effective polarized neutron target with freely adjustable polarization orientation. The scattered electrons were detected by a magnetic spectrometer in coincidence with the knocked out neutrons detected in a nucleon detector. Beam helicity asymmetries are sensitive to Gen for a neutron polarization perpendicular to the momentum transfer. Asymmetries for parallel orientation are dominated by Gmn and can be used for a reduction of systematic errors. Perpendicular and parallel asymmetries were measured to provide a measurement of Gen/Gmn. Employing the results of existing absolute Gmn measurements, Gen can be extracted. The experimental setup and preliminary results will be shown.