a Spin Filter Polarimeter and AN Alpha-Particle D-State Study

A Spin Filter Polarimeter (SFP) which reveals populations of individual hyperfine states of nuclear spin -polarized H^+/- (or D ^+/-) beams has been tested. The SFP is based on unique properties of a three-level interaction in the 2S_{1/2} and 2P _{1/2} states of the hydrogen (or deuterium) atoms, created when the polarized ion beams pick up electrons in cesium vapor. The SFP has potential for an absolute accuracy of better than 1.5%, thus it could be used for calibrating polarimeters absolutely for low energy experiments for which no nuclear polarization standard exists. Test results show that the SFP provides a quick and elegant measure of the relative hyperfine state populations in the beam. This alpha-particle study is a small part of a larger project studying the deuteron -deuteron configuration of the alpha -particle wave function (Cro93). The differential cross section and tensor analyzing powers (TAP) were measured for the ^{50}Ti(vec d,alpha)^{48}Sc reaction to the rm J^pi=7^+ state in ^{48}Sc at E _{rm x} = 1.097 MeV and compared with exact finite-range distorted-wave Born approximation (DWBA) calculations. The DWBA calculations use realistic alpha-particle wave functions generated from variational Monte-Carlo calculations.