Systematics ofinduced8radioactive beam reactions:E=13–20 MeV

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