Comparison of the noncoplanar 6Li(p,pd)4He reactions at 120 and 200 MeV

The 6Li(p,pd)4He reaction was studied at 200.2 MeV, at the quasi-free angle pair (THETAsub(p),THETAsub(d))=(540, -48.90), for noncoplanarity angles PHI from 00 to 280. 6Li αd spectroscopic factors of 0.84 and 0.76 are deduced from our coplanar data at this energy and 120 MeV, respectively, for ground-state 2S Woods-Saxon wave functions. A recent microscopic three-body calculation predicts spectroscopic factors from 0.70 to 0.75; using the ground-state wave functions from this study, we deduce a factor of 0.76 from the 200 MeV data. DWIA calculations fit the measured integrated cross sections versus PHI for spectator momenta psub(α)< or approx.100 MeV/c at both bombarding energies, but underpredict them for larger psub(α). Momentum form factors were better reproduced with 1S αd cluster wave functions for a soft-core bound-state potential than with the 2S Woods-Saxon wave functions, but the former wave functions generate unphysically large (approx.=1.25) spectroscopic factors. (orig.)