Yield Curves for Li + Li and Li + Be Nuclear Reactions

Differential cross sections for ${\mathrm{Li}}^{6,7}$ + ${\mathrm{Li}}^{6,7}$ + ${\mathrm{Be}}^9$ nuclear reactions leading to low-lying residual-nucleus states have been measured over the energy range from 4-14 MeV. In the ${\mathrm{Li}}^7({\mathrm{Li}}^7,\alpha ){\mathrm{Be}}^{10}\mathrm{}\left(3.37\right)\mathrm{}$ case, the energy range was extended to 2.1 and 21 MeV. Striking enhancement and weakening of cross sections for formation of the 0.72-MeV state in ${\mathrm{B}}^{10}$ can be attributed to cluster structure of lithium nuclei. Resonance-like peaks are observed in some yields. Their general character is consistent with an extended-structure interpretation of the reaction mechanism.