Three-body final states of the 3He+7Li reaction and clustering in 7Li

Absolute coincidence cross sections for five three-body final states of the 3He+7Li reaction have been measured with 37.5 MeV incident 3He ++ ions at geometries where quasi-elastic scattering could occur. The spectra were fitted with plane wave (PWIA) and/or modified plane wave impulse approximation (MPWIA) calculations. Data from the 7Li(3He, 3He t)α reaction were consistent with strong α-t clustering in 7Li. The yield from the reaction 7Li(3He,3He d)5He was equally large but inconsistent with the existence of deuteron clusters when interpreted by the MPWIA. Momentum distributions of spectator α and 5He particles from these reactions were consistent with l=1 and l=0, respectively. Cross sections for the 3He+6Li+n, 3He+6He+p and t+6Li+p final states were small, inconsistent with PWIA predictions for l=1, and hence indicate very small 6Li and 6He cluster probabilities in 7Li. (Auth.)