The effect of angular momentum on the competition between fission and particle emission during light system fission process was studied via fission diffusion model. The prescission particle multiplicities were found to increase with decreasing angular momentum. The experimental prescission proton and α particle multiplicities can be fitted for 10.6 MeV/nucleon 84 Kr( 27 Al,binary fission) reaction with this model. Entrance channel effect found in [1] is proved to be angular momentum effect.

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Proton and deuteron correlation functions have been investigated with both impact parameter and emission source selections. The correlations of the system 129 Xe + Nat Sn at 50 AMeV have been measured with the 4π INDRA which provides a complete kinematical description of each event. The emission time scale analyzed with a quantum model reveals the time sequence of the light particles emitted by the projectile-like fragment. The short and constant emission time of the proton, independent of the impact parameter, can be attributed to a preequilibrium process.