Abstract
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 ${\mathrm{Li}}^{7}({\mathrm{Li}}^{7},\ensuremath{\alpha}){\mathrm{Be}}^{10}(3.37)$ 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.
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