We report for the first time coincident ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and $\alpha$ particles emitted in the bombardment of ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ with ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ ions of 64 MeV. Events which populate the ground and first excited states of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ are observed. The coincident ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ energy spectra are dominated by one or two large peaks near the highest allowable ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ energy. Relatively few coincidences are seen at ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ energies which correspond to maximum yield in the ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$) singles spectrum.

• Received 2 July 1974

DOI:https://doi.org/10.1103/PhysRevLett.33.784