Measurement of the neutron spin structure function g1n and a pQCD NLC analysis

We have measured the spin structure function of the neutron g1n in the kinematic region 0.014≤x≤0.7 and 1≤Q2≤15. The experiment was done at SLAC by scattering longitudinal polarized 48.3 GeV electrons from a He3 target polarized in the longitudinal and transverse directions. g1n becomes more negative with decreasing x in a manner inconsistent with naive single pole Regge theory. In the kinematic region 0.08≤x≤0.4 we can determine the Q2 dependence of g1n using data from both our spectrometers. A Next to Leading Order Perturbative QCD analysis has been made with this and previous data to extract the parton distributions and make an estimate of the very low x behavior. copyright 1997 American Institute of Physics