The maximum energy of the $\gamma$-rays from the disintegration of a thick target of fluorine by protons has been determined at 0.90 Mev and 1.7 Mev. The energy of the $\gamma$-rays was found to be the same at both bombarding voltages. The $\gamma$-rays from the disintegration of fluorine by deuterons have been studied with 1.3-Mev deuterons. The $\gamma$-rays were found to be complex and to have a maximum energy of 6.7±0.3 Mev. This indicates that the highly excited states of ${\mathrm{Ne}}^{20}$ at 9.0 and 10.1 Mev, which were found in the reaction ${\mathrm{F}}^{19}\mathrm{}(d,n)\mathrm{}{\mathrm{Ne}}^{20}$, break up into ${\mathrm{O}}^{16}$ and ${\mathrm{He}}^4$ instead of emitting $\gamma$-rays.

• Received 31 March 1941

DOI:https://doi.org/10.1103/PhysRev.59.793