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THE GDH SUM RULE WITH NEARLY REAL PHOTONS AND THE G1 PROTON STRUCTURE FUNCTION AT LOW MOMENTUM TRANSFER

A measurement of the proton structure function gl for momentum transfer Q^2 in the range 0.01-0.5 GeV^2 /c^2 is planned in Hall B at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). The CEBAF polarized electron beam with energy between 1 and 3.2 GeV will scatter off a polarized solid state target. The outgoing electrons will be detected down to a minimum angle of ~5 degrees in CLAS thanks to a new gas Cherenkov counter designed to optimize the detection efficiency and pion rejection in the operating conditions of this experiment. The proton spin structure function g1 will be measured from the threshold region to the resonance region and beyond. The expected results will add high precision information on the nucleon spin response in kinematics where tests of Chiral Perturbation Theory are possible, and provide the data for an improved understanding of hadronic spin processes in the confinement regime.