K. D. Veal

A proton polarimeter for 3He(d,p)4He polarization transfer studies

Abstract A compact polarimeter has been constructed and calibrated to measure the polarization of 13–16 MeV protons, such as those emitted from the 3 He(d,p) 4 He reaction near the E d =430 keV resonance. The polarimeter uses p- 4 He elastic scattering as an analyzer. It consists of a 4 He gas cell pressurized to 2.76 MPa and a left–right pair of CsI detectors collimated at 65° to maximize the figure of merit for the device. The effective analyzing power and efficiency of the polarimeter have been measured as a function of energy using a collimated polarized proton beam. These measured values are in good agreement with a Monte Carlo computer simulation that forms the basis for the calibration curve for the device. Preliminary results from the 3 He(d,p) 4 He reaction with polarized deuterons confirm that the proton polarimeter can be used to determine polarization transfer coefficients near the low-energy resonance.

Studies of the D state of {sup 6}Li using the FSU polarized {sup 6}Li Beam

One way to quantify the D-state component of the wave function of a nucleus is by the quantity η, the ratio of the D- and S-state asymptotic normalization constants. Analyses of the analyzing powers from transfer reactions induced by polarized ions have been useful for the determination of η in the A=2−4 systems. In an effort to determine η for the d+α relative motion in 6Li we have measured analyzing powers for (6Li,d) reactions on 58Ni and 40Ca at E(6Li)=34 MeV. The experiments were performed at Florida State University using the Optically Pumped Polarized Lithium Ion Source. We compared the data with the results of well-constrained DWBA calculations assuming a direct α-particle transfer mechanism. With η the only free parameter in the calculations, a best fit to the tensor analyzing power data results in an average value of η=+0.0003±0.0009, much smaller than previous determinations.