摘要: 本文介绍了裂变扩散模型．裂变扩散过程及在此过程中的轻粒子发射用推广的Ｓｍｏｌｕｃｈｏｗｓｋｉ方程描写．裂变率的时间行为存在暂态过程和与通常的核反应统计理论相一致的反应过程．在高能重离子反应中，暂态过程起着重要的作用，导致轻粒子发射的增强．文中还描述了粒子多重数的计算，并讨论了与核温和与粘滞系数的关系．对１５８Ｅｒ核的理论计算并与实验测量的比较表明，理论计算很好地再现了实验结果．并得到１５８Ｅｒ核的粘滞系数约为６．０×１０２１ｓ－１． The fission diffusion model is introduced. The diffusion process with lightparticle emission is expressed by extensive Smoluchowski equation. The calculation showsthe time dependence of the fission rate and the existence of transient process. The transientprocess is very important in high energy heavy ion collisions and leads to the enhancement ofthe light particle emission. The particle multiplicity is also given which depends on nucleartemperature and nuclear friction constant. For ...