COMPOUND-NUCLEUS CONTRIBUTIONS TO LI-6-12 SCATTERING(C)

Statistical compound-nucleus contributions to enhanced back-angle cros s sections for Li-6 + C-12 elastic scattering and for inelastic scatte ring to the channels, Li-6(3(+), 2.18 MeV) + C-12(g.s.) and Li-6(g.s.) + C-12(2(+), 4.44 MeV), are studied. Differential cross sections and vector analyzing powers in the range Theta(c.m.) approximate to 130 de grees-165 degrees have been measured at E(c.m.) = 20 MeV by detecting recoil C-12 nuclei from (6)<(Li)over right arrow> elastic scattering a nd inelastic scattering to the Li-6(3(+), 2.18 MeV) state. Adding a st atistical compound-nucleus contribution is shown in general to reduce the magnitude, and to leave unaffected the sign, of theoretical calcul ations of vector analyzing powers. Analysis, including Hauser-Feshbach calculations, of the above data along with previous data indicates th at compound-nucleus contributions are unimportant in the elastic and i nelastic Li-6(2.18 MeV) scattering channels, and are insufficient to r esolve discrepancies between current coupled-channels calculations and large-angle data for inelastic C-12(4.44 MeV) scattering.