STRUCTURE OF LI-4 AND HE-4 OBSERVED IN THE H-1(ALPHA,HE-3P)N REACTION

Kinematically complete measurements of the H1(,3He p)n reaction at E=170 MeV were made at several He3 and proton angles. Assuming an incoherent sum of different multipole contributions in different reaction channels, it was possible to describe all measured spectra consistently, taking into account sequential decay of states in He4 and Li4 and the p-n final state interaction. The parameters used to describe the p-n final state interaction and excited states in He4 are consistent with previous measurements. Resonance energies and widths for the ground state and the first excited state of Li4 were extracted which are considerably lower than assumed so far. The measured cross sections are in agreement with distorted-wave Born approximation calculations using folding form factors. © 1990 The American Physical Society.