Comparison of Energy Levels ofLi6from Various Reactions

The nuclear energy levels of ${\mathrm{Li}}^6$ of excitations less than 5 Mev were studied by using inelastic scattering of deuterons and protons and the ${\mathrm{Be}}^9(p, \alpha ){\mathrm{Li}}^6$ reaction. An electrostatic accelerator and a broad-range magnetic spectrograph gave high precision and resolution. Levels were observed at 2.188±0.006 Mev and at 3.560±0.006 Mev, the former with all three reactions and the latter with all but deuteron scattering which is forbidden by the isotopic-spin selection rule. No other levels were observed. A study of the peak shapes yields 24 kev for the half-width of the 2.188-Mev level, in agreement with previous measurements on the compound nucleus.