POLARIZATION AND PHASE SHIFTS IN 6LI(P,P)6LI FROM 3.5-MEV TO 5.6-MEV

Angular distributions of polarization in 6Li(p, p)6Li have been measured to an accuracy of about 0.01 at 11 energies from 1.2 to 3.2 MeV with a target of 20 keV thickness at 2 MeV. These data and cross section measurements of others are reproduced well by a set of phase shifts, which vary reasonably with energy and which are complex because a reaction channel is open. The 2S-, 4S- and 4P-phases suffice for the analysis. Neither 2P-phases nor mixing parameters are found to be important. The 4P 5 2 phase resonates at 1.8 MeV as expected. The broad resonance at 5 MeV can be reproduced equally well with either the 4P 3 2 or the 4P 1 2 phase resonating, the former agreeing with a previous spin assignment. Measurements of cross section, proton polarization and 6Li vector polarization cannot distinguish between the two sets, but measurements of 6Li tensor polarization could. The uniqueness of the phases is discussed and a polarization contour map is presented. © 1969.