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
(1)
,
P. Achenbach
(1)
,
C. A. Ayerbe Gayoso
(1)
,
J. C. Bernauer
(1)
,
R. Böhm
(1)
,
D. Bosnar
(2)
,
T. Challand
(3)
,
M.O. Distler
(1)
,
L. Doria
(1)
,
F. Fellenberger
(1)
,
H. Fonvieille
(4)
,
M. Gómez Rodríguez
(1)
,
P. Grabmayr
(5)
,
T. Hehl
(5)
,
W. Heil
(6)
,
D. Kiselev
(7)
,
J. Krimmer
(6, 8)
,
M. Makek
(2)
,
H. Merkel
(1)
,
D. G. Middleton
(5)
,
U. Müller
(1)
,
L. Nungesser
(1)
,
A. Ott B.
(5)
,
J. Pochodzalla
(1)
,
M. Potokar
(9)
,
S. Sánchez Majos
(1)
,
M. Sargsian M.
(10)
,
I. Sick
(3)
,
S. Širca
(9, 11)
,
M. Weinriefer
(1)
,
M. Wendel
(1)
,
J. Yoon
(1)
1
Institut für Kernphysik
2 Department of Physics [Zagreb]
3 Department of Physics
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 Physikalisches Institut [Tübingen]
6 Institut für Physik [Mainz]
7 SLS-PSI - The Swiss Light Source (SLS)
8 IPNL - Institut de Physique Nucléaire de Lyon
9 IJS - Jozef Stefan Institute [Ljubljana]
10 Department of Physics
11 Department of Physics
2 Department of Physics [Zagreb]
3 Department of Physics
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 Physikalisches Institut [Tübingen]
6 Institut für Physik [Mainz]
7 SLS-PSI - The Swiss Light Source (SLS)
8 IPNL - Institut de Physique Nucléaire de Lyon
9 IJS - Jozef Stefan Institute [Ljubljana]
10 Department of Physics
11 Department of Physics
B.S. Schlimme
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H. Fonvieille
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- IdHAL : helene-fonvieille
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J. Krimmer
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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).