Abstract
Highly excited states of ${}^{10}\mathrm{Be}$ are formed by the bombardment of ${}^{7}\mathrm{Li}$ targets by ${}^{7}\mathrm{Li}$ beams at 34 and 50.9 MeV from the Florida State University Tandem/LINAC accelerator facility. The states are observed in three-body final state reactions by coincidence measurement of the vector momenta of two of the three particles and reconstruction of the decay energies. We observe decays involving ${}^{7}\mathrm{Li},$ ${}^{8}\mathrm{Li},$ ${}^{9}\mathrm{Li},$ and ${}^{6}\mathrm{He}$ in their ground states, first excited states, and in some cases second excited states. Fifteen of the 18 excitations observed are proposed as possible new states of ${}^{10}\mathrm{Be}.$ A few $\ensuremath{\alpha}$-particle decays of excited boron isotopes are also reported.
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