Which sort of particles was emitted earlier during decay of highly excited nuclei?

Emission orders of light charged particles and Li fragments from highly excited fissioning nuclei in the reaction of40Ar +197Au atEbeam/A = 25 MeV have been studied by measuring difference velocity distributions of two correlated particles at small relative angles in coincidence with two fission fragments. By comparing the data with three-body trajectory calculations, it is found that high-velocity light particles (tritons and He particles) are emitted prior to high-velocity Li fragments but low-velocity light particles are emitted after low-velocity Li fragments. On the other hand, no preferential emission was observed among light particles, such as deuterons and tritons.