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

Schlimme, B. S. and Achenbach, P. and Ayerbe Gayoso, C. A. and Bernauer, J. C. and Bohm, R. and Bosnar, Damir and Challand, Th. and Distler, M. O. and Doria, L. and Fellenberger, F. and Fonvieille, H. and Gomez Rodriguez, M. and Grabmayr, P. and Hehl, T. and Heil, W. and Kiselev, D. and Krimmer, J. and Makek, Mihael and Merkel, H. and Middleton, D. G. and Muller, U. and Nungesser, L. and Ott, B. A. and Pochodzalla, J. and Potokar, M. and Sanchez Majos, S. and Sargsian, M. M. and Sick, I. and Širca, S. and Weinriefer, M. and Wendel, M. and Yoon, C. J. (2013) Measurement of the Neutron Electric to Magnetic Form Factor Ratio at Q2=1.58  GeV2 Using the Reaction 3He⃗(e⃗, e′n)pp. Physical Review Letters, 111 (13). pp. 132504-5. ISSN 0031-9007

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Abstract

A measurement of beam helicity asymmetries in the reaction 3He⃗(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 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).

Item Type: Article
Keywords: electromagnetic form factors, protons and neutrons, elastic electron scattering
Date: September 2013
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2013) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191005-1021
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 05 Jun 2014 08:44
Last Modified: 23 Feb 2016 15:20
URI: http://digre.pmf.unizg.hr/id/eprint/2187

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