Excited states of ⁸Be populated via the p(⁷Li, ⁴He)⁴He and p(⁷Li, ⁴He*)⁴He resonant reactions

A measurement of the p(Li-7, He-4)He-4 resonant reaction on a thick mylar target was used to probe resonances in Be-8 in the excitation energy range 20-25 MeV. The Li-7 beams, of energies 25.8 and 58 MeV, were stopped in the target and the resulting alpha-particles were detected at zero degrees. Evidence was found for resonances at similar to 20 and similar to 25 MeV with J(pi) = 0(+) and 2(+) character, respectively. A simultaneous measurement of the p(Li-7, He-4* -> p + t)He-4 reaction was performed, in which one of the two final-state alpha-particles was produced in the 20.2MeV excited state. These events were observed to arise from an excitation energy region 23-25 MeV and have been associated with the decay of the 25.2 MeV 2(+) Be-8 resonance. The 25.2 MeV resonance is found to have a dominant He-4 + He-4* reduced width.