MEASUREMENT OF THE PROTON AND DEUTERON SPIN STRUCTURE-FUNCTION G(1) IN THE RESONANCE REGION

We have measured the proton and deuteron spin structure functions g(1) (p) and g(1)(d) in the region of the nucleon resonances for W-2 < 5 Ge V2 and Q(2) similar or equal to 0.5 and Q(2) similar or equal to 1.2 G eV2 by inelastically scattering 9.7 GeV polarized electrons off polari zed (NH3)-N-15 and (ND3)-N-15 targets. We observe significant structur e in g(1)(p) in the resonance region. We have used the present results , together with the deep-inelastic data at higher W-2, to extract Gamm a(Q(2)) equivalent to integral(0)(1) g(1)(x,Q(2))dx. This is the first information on the low-Q(2) evolution of Gamma toward the Gerasimov-D rell-Hearn limit at Q(2) = 0.