We have measured the transverse asymmetry from inclusive scattering of longitudinally polarized electrons from polarized 3He nuclei at quasi-elastic kinematics in Hall A at Jefferson Lab with high ...statistical and systematic precision. The neutron magnetic form factor was extracted based on Faddeev calculations with an experimental uncertainty of less than 2 %.
A measurement of the proton spin structure function
g
1
p(
x,
Q
2) in deep-inelastic scattering is presented. The data were taken with the 27.6 GeV longitudinally polarised positron beam at HERA ...incident on a longitudinally polarised pure hydrogen gas target internal to the storage ring. The kinematic range is 0.021<
x<0.85 and 0.8 GeV
2<
Q
2<20 GeV
2. The integral
∫
0.021
0.85
g
1
p
(x)
dx
evaluated at
Q
0
2 of 2.5 GeV
2 is 0.122±0.003(stat.)±0.010(syst.).
Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function
g
1
n
(
x, Q
2) in deep inelastic scattering using 27.5 GeV longitudinally polarized ...positrons incident on a polarized
3He internal gas target. The data cover the kinematic range 0.023 < × < 0.6 and 1 (GeV/
c)
2 <
Q
2 < 15 (GeV/
c)
2. The integral ∫
0.6
0.023
g
1
n
(
x)
dx evaluated at a fixed
Q
2 of 2.5 (GeV/
c)
2 is −0.034 ± 0.013(stat.)±0.005(syst.). Assuming Regge behavior at low
x, the first moment Г
n
1 = ∫
1
0
g
1
n
(
x)
dx is −0.037 ± 0.013(stat.)±0.005(syst.)±0.006(extrapol.).
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