通过测量两裂片符合下两关联粒子的速度差分布 ,研究了 2 5MeV/u40 Ar +197Au反应中高激发核出射轻粒子和Li碎片的发射次序 .通过比较实验结果和三体弹道计算结果 ,观察到高速轻粒子 (氚和氦粒子 )优先于高速Li碎片发射 ,但低速轻粒子却在低速Li碎片之后发射 .此外 ,观测到轻粒子之间 (如氘和氚 )无优先发射 By measuring the velocity distribution of the two lobes in accordance with the velocity of the next two related particles, the emission order of the light-exiting particles and the Li-fragments with high excitation nuclei in 25MeV / u40 Ar + 197Au reaction was studied.By comparing the experimental results with the three-body ballistic results, High-speed light particles (tritium and helium particles) are emitted prior to high-speed Li fragments, but low-speed light particles are emitted after low-speed Li fragments. In addition, no preferential emission between light particles (such as deuterium and tritium)