SYSTEMATICS OF LI-8-INDUCED RADIOACTIVE BEAM REACTIONS - E=13-20 MEV

Elastic and inelastic scattering, one-nucleon transfers [mostly (Li-8,Li-7)] and the (Li-8,alpha) fusion-evaporation reaction have been studied on a variety of targets (A=1-58) at E(Li-8) almost-equal-to 13-20 MeV using the University of Michigan-University of Notre Dame radioactive nuclear beam (RNB) facility. The latter, which produces an energy-resolved (approximately 500 keV FWHM), focused beam with intensity greater than or similar to 10(6) Li-8/s, permitted measurements to selected nuclear levels with cross sections down to approximately 1 mb/sr. Based on the systematics of the measured Li-8 elastic scattering an appropriate Li-8 optical potential was deduced. Large inelastic scattering cross sections (and B[E2 up]) are observed for Li-8-->Li-8(0.98)*. Large cross sections are also observed for the (Li-8,Li-7) transfer reaction corresponding to quasielastic (viz., Q almost-equal-to 0) neutron transfer to selected high spin excited levels in the residual nucleus. The (Li-8, alpha) fusion-evaporation reaction also appears to be significant and can produce very-high-energy a particles, viz., E(alpha) much greater than E(beam). Although observed using Li-8, these features appear to be important for many RNB-induced reactions and they must be considered, for example, in nucleosynthesis calculations involving Li-8 and other short-lived radioactive nuclei.