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    Neutron Spin Structure Study at Jefferson Lab Hall A

    With a high-intensity highly-polarized 6 GeV electron beam, and a high-density polarized 3He target, we have carried out a number of experiments to study the neutron spin structure at Hall A in Jefferson Lab. Taking advantage of the high luminosity of Jefferson Lab, we completed two inclusive deep-inelastic-scattering experiments this summer. In the first, precision measurements were made of the spin asymmetry An1 in the valence quark (high Bjorken x) region; and in the second, higher-twist effects were studied via precision measurements of gn2. Physics motivation and preliminary results from the first experiment will be presented and discussed. I will also present nearly final results from an earlier experiment, which measured the generalized GDH sum for the neutron in the Q2 range of 0.1 to 1 GeV2. Planned near-term experiments will be briefly discussed.

    This work was supported by U.S. DOE under contract DE-AC05-84ER40150.

    Author: Jian-ping Chen



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