POLARIZED GAS TARGETS FOR ELECTRON-SCATTERING EXPERIMENTS

Polarized gas targets represent a unique opportunity for the measurement of spin observables in electro-nuclear physics. The status in polarized target technique is briefly reviewed, which entails a discussion of atomic beam sources for H-1 and H-2, and spin- and metastability-exchange sources for He-3. Attention is paid as much as possible to new developments. As a specific example, we discuss how the asymmetries for the reaction He-3 over arrow pointing right(e over arrow pointing right, e'p) may provide precise information on the small mixed-symmetry S' and the D-wave parts of the He-3 ground-state wave function.