Emission time of light particles with respect to measurement angle

Particle-particle correlation functions at small correlation angle have bee n measured for Ar-40 + Nb-93 collision at E = 25MeV/u. Based on three-body trajectory calculation the emission time scale of light particles has been extracted from correlation function of two particles at small relative mome ntum. The mean emission time scale decreases with increasing sum of the kin etic energies of the particles in a correlated pair. It decreases from abou t 500 fm/c for low energy particles to about 50 fm/c for high-energy partic les. And the extracted emission time scales from larger detection angle are longer than that extracted from the data obtained at small detection angle , which can be explained as the more particles emitted from equilibrated sy stem.