The spin structure of the nucleon measured in SLAC Experiment 155

Experiment E155 measured the nucleon spin structure functions g(1) and g(2) using 48.3 and 38.8 GeV SLAC polarized beams incident on (NH3)-N-15 and (L iD)-Li-6 solid polarized targets. The 48 (39) GeV beam was used to measure parallel (perpendicular) asymmetries. The proton and deuteron data are comb ined to extract the neutron structure functions. The scattered electrons we re detected in three spectrometers. The measurement of g(1) has yielded the most precise data on the proton and deuteron to date. Results on the x(B) and Q(2) dependence of the deuteron, proton and neutron structure functions are presented; including phenomenological and NLO pQCD fits to the world d ata on g(1). The quark contribution to the nucleon spin has been extracted. The fundamental Bjorken sum rule is found to be fulfilled well within the experimental and theoretical errors. Inclusive hadron asymmetries were extr acted as well and are compared with recent calculations.