Measurement of the Proton and Deuteron Spin Structure Function g1 in the Resonance Region

(Accepted in Phys. Rev. Lett.) The nucleon spin structure functions g1 and g2 have been and continue to be intensively studied via deep- inelastic lepton scattering [1–6]; however, they remain largely undetermined in the resonance region, where the squared invariant mass of the final state W2 is less than 4 GeV2.