Large angle correlations have been measured between two light particles (Z=1,2) emitted from 40 MeV/nucleon C+C, Ag, Au, and 50 MeV/nucleon C+C reactions. The first particle is detected at θ=-45°, and the second particle is detected in the same plane with -150°≤θ≤+150°. The correlations are consistent with emission from a thermalized system that is constrained by momentum conservation effects. In addition, the decay of particle unstable states contributes heavily to the coincidence cross sections for p-p, p-t, p${\mathrm{-}}^4$He, d${\mathrm{-}}^4$He, t${\mathrm{-}}^4$He, and ${}_{}{}^4{}_{}{}^{}\mathrm{-}_{}^4{}_{}{}^{}$He correlations.

• Received 5 March 1987

DOI:https://doi.org/10.1103/PhysRevC.36.640