[en] We have measured the spin structure functions g₂^p and g₂^d and the virtual photon asymmetries A₂^p and A₂^d over the kinematic range 0.02 < x < 0.8 and 1.0 < Q² (le) 30(GeV/c)² by scattering 38.8 GeV longitudinally polarized electrons from transversely polarized NH₃ and ⁶LiD targets.The absolute value of A₂ is significantly smaller than the √R positivity limit over the measured range, while g₂ is consistent with the twist-2 Wandzura-Wilczek calculation. We obtain results for the twist-3 reduced matrix elements d₂^p, d₂^d and d₂ⁿ. The Burkhardt-Cottingham sum rule integral (g₂(x)dx) is reported for the range 0.02 (le) x (le) 0.8

[en] New measurements are reported on the deuteron spin structure function g₁^d. These results were obtained from deep inelastic scattering of 48.3 GeV electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 < Q² < 40 (GeV/c)². These are the first high dose electron scattering data obtained using lithium deuteride (⁶Li²H) as the target material. Extrapolations of the data were performed to obtain moments of g₁^d, including Γ₁^d, and the net quark polarization Δ Σ

[en] We have measured the proton and deuteron spin structure functions g₁^p and g₁^d in the region of the nucleon resonances for W² < 5 GeV² and Q² ≅ 0.5 and Q² ≅ 1.2 GeV² by inelastically scattering 9.7 GeV polarized electrons off polarized ¹⁵NH₃ and ¹⁵ND₃ targets. We observe significant structure in g₁^p in the resonance region. We have used the present results, together with the deep-inelastic data at higher W², to extract Γ(Q²) (triple_bond) ∫₀¹ g₁(x,Q²) dx. This is the first information on the low-Q² evolution of Gamma toward the Gerasimov-Drell-Hearn limit at Q² = 0