P. D. Cathers

Observation of peripheral localization in polarized nuclear reactions

Abstract The odd rank analyzing powers T T 10 and T T 30 for 12 C( 7 Li → , 7 Li) 12 C and 12 C( 7 Li → , α ) 15 N have been measured with high precision for a 7 Li → bombarding energy of 34 MeV. The angular distributions of the T T 10 and T T 30 data are strongly correlated, marking the first experimental evidence of a relationship between analyzing powers of different rank. The ratio of T T 30 to T T 10 obeys limits derived from the assumptions that the reaction is both peripheral and well localized in the reaction plane, allowing, for the first time, a third rank analyzing power to contribute to our understanding of 7 Li.

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.