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DESCRIPTION:Pibero Djawotho\, College of William & Mary\n\nThis talk presen
ts results of experiment E94-010 performed at JLAB (simply known as JLab)
in Hall A. The experiment aimed to measure the low Q2 ev
olution of the Gerasimov-Drell-Hearn(GDH) integral from Q2 = 0.1 to 0.9 GeV2. The GDH sum rule at the real photon poin
t provides an important test of Quantum Chromodynamics (QCD) radiative rec
tions. The low Q2 evolutions of the GDH integral contes
ts various resonance models. Chiral Perturbation Theory and lattice QCD c
alculations\, but more importantly\, it helps us understand the transition
between partonic and hadronic degrees of freedom. At high Q2
\, beyond 1 GeV2\, the difference of the GDH integrals fo
r the proton and the neutron is related to the Bjorken sum rule\, another
fundamental test of QCD radiative corrections. In addition\, results of t
he measurements for the spin structure functions g1 and g2
cross sections\, and asymmetries are presented. E94-010 was t
he first experiment of its kind at JLAB. It used a high-pressure\, polari
zed 3He target with a gas pressure of 10 atm and average target
polarization of 38%. For the first time\, the polarized electron source
delivered an average beam plarization of 70% with a beam current of 15 µa
\; The limit on the beam current was only imposed by the target. The expe
riment required six different beam energies from 0.86 to 5.1 GeV. This wa
s the first time the accelerator ever reached 5.1 GeV. Both High-Resoluti
on Spectrometers of Hall A\, used in singles mode\, were positioned at 15.
5 degree\; each.
DTSTART:20031111T203000Z
LOCATION:Physics Building\, Room 204
SUMMARY:Measurement of the Neutron (3He) Spin Structure Function
s at Low Q2\; a Connection between the Bjorken and Geras
imov-Drell-Hearn Sum Rule
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