The noncoplanar 7Li(p,pd)5He and 7Li(p,pt)4He reactions at Esub(p)=200 MeV, and evidence for deuteron clustering in 7Li

The 7Li(p,pd)5He reaction was studied at 200 MeV, at the quasi-free angle pair thetasub(p)/thetasub(d) = 640/-47.40, for noncoplanarity angles from 00 to 160. Data were fitted with DWIA calculations, which gave a spectroscopic factor Csub(d) of 1.1 for deuterons in 7Li if entrance-channel absorption was neglected, and 1.4 if it was not. The Csub(d) deduced from plane-wave analysis (by comparison with 6Li(p,pd) data) is 0.9. The deuteron cluster momentum distribution is characterized, at small momentum by an FWHM of 140 MeV/c. At large momentum there is an excess of measured cross section over predictions, as is true also for 6Li(p,pd) at intermediate energies. Cross sections for 7Li(p,pt)4He at the same experimental conditions are very small but are consistent with unit spectroscopic factor for t+α; these cross sections show the expected minimum at zero relative cluster momentum, and are adequately fitted by DWIA predictions. (orig.)