A ${\left({\mathrm{Li}}^7\right)}_2$S${\mathrm{O}}_4$ target was bombarded with ${\mathrm{He}}^{3++}$ ions at 720 kev, and the energies of the charged particles emitted were analyzed by means of a NaI spectrometer. The spectrum was found to consist in part of particles smoothly distributed in energy; and in part of relatively sharp groups of particles of defined energies. Evidence is presented that the five highest pulse height groups of charged particles consist of protons corresponding to defined energy states in ${\mathrm{Be}}^9$. The observed proton energies are 10.51±0.03, 8.9±0.2, 8.3±0.2, 7.6±0.1, and 6.1±0.10 Mev. In addition, group of particles were barely discernible at the lower half of the pulse height scale used for the protons. Although these groups of particles are not positively identified, it seems relatively certain that they are $\alpha$-particles corresponding to ${\mathrm{Li}}^6$ in its various energy states. A special attempt to identify groups of deuterons failed, indicating that for some reason the formation of ${\mathrm{Be}}^8$ is discriminated against in this reaction.

• Received 23 July 1954

DOI:https://doi.org/10.1103/PhysRev.96.1363