Reaction products from compound-nucleus formation via the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + Mg and ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ reactions have been identified by means of $\gamma$-ray—$\gamma$-ray coincidence techniques. For bombarding energies in the ranges $24 \mathrm{MeV}\le E_c\le 26 \mathrm{MeV}$ and $30 \mathrm{MeV}\le E_0\le 40 \mathrm{MeV}$, the light-particle emission consists largely of the ($2p$), ($\mathrm{pn}$), and ($\alpha p$) modes. The data also suggest that single-proton and single-neutron emissions take place. The relative cross sections for certain of the $\gamma$ rays associated with the ($2p$) and ($\mathrm{pn}$) processes imply a steadily increasing fusion cross section over the 30-40-MeV range.

• Received 8 March 1973

DOI:https://doi.org/10.1103/PhysRevC.8.1721