Complex fragments of nuclear charge $Z$ from 4 to 13 were measured at five laboratory angles by use of surface-barrier-detector telescopes. Coincident $\gamma$ rays were measured in a $4\pi$ geometry using 64 NaI detectors. Kinematical analysis of the fragments revealed that those of $Z$ between 4 and 9 are consistent with the decay of a compound nucleus formed in a complete fusion reaction. $\gamma$ rays of excited states of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$, and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ were measured and effective temperatures of about 2 MeV were extracted. Hauser-Feshbach calculations reproduce the measured cross sections and the effective temperatures very well.

• Received 21 March 1988

DOI:https://doi.org/10.1103/PhysRevLett.61.290