## RECENT PROGRESS IN FISSION THEORY BASED ON DIFFUSION MODELInstitute of Atomic EnergyP.O. Box 275, Beijing, China In this talk a review on recent progress of fission theory from point of view of diffusion process is presented. The time-dependent fission rate is calculated with a simplified model for illustration. The transient phenomena are revealed. By comparison of the fission rate calculated both at saddle and scission points, the latter is emphasized for actual calculation. Some current progress on more realistic calculations related to the enhancement of the neutron emission prior to fission induced by heavy ion reactions is reported. The quantum effects which are important for low energy nuclear fission and the extension to multi-dimensional cases are also discussed. A self-consistent model to treat all the fission phenomena in a unified way, which might be also useful in the nuclear data evaluation is expected to be established in near future. KEYWORDS: diffusion model, fission rate, transient phenomena, saddle point, scission point, propagator |