Precision Measurement of Neutron Asymmetry A_1~n in the Valence Quark Region

摘要

We have measured the neutron virtual photon asymmetry A_1~n over the kinematic range 0.33 ≤ x ≤ 0.61 and 2.7 ≤ Q~2 ≤ 4.9 (GeV/c)~2. To extract A_1~n, longitudinal and transverse spin asymmetries have been measured for inclusive ~3He(e,e') scattering, using a 5.7 GeV longitudinally polarized electron beam at Jefferson Lab and a high-density polarized ~3He target in Hall A. Preliminary results of A" are presented and compared to existing data and various models, including the predictions of SU(6), broken SU(6) constituent quark models, perturbative QCD based models and chiral soliton model.