A polarized 3He target, which uses conventional optical pumping with 4He discharge lamps, has been used for the measurement of 3He analyzing powers Ay(θ) at energies of 25.0, 30.0, 32.5, and 35.0 MeV. The statistical uncertainties in the data are on the order of 0.03; the systematic uncertainty is estimated to be 0.05. These data are compared with fits and predictions from various phase shift analyses.

A polarized 3He target, which uses conventional optical pumping with 4He discharge lamps, is described. Emphasis is given to the experience gained with its use during nuclear scattering experiments using proton beams from the University of Manitoba cyclotron. An analysis of possible errors in present and past experiments is given.