LEAST-ACTION TRAJECTORIES AND LIFETIMES C ALCULATIONS FOR 3 DECAY-MODES OF U-234

A numerical method is used to obtain the optimum cold fission paths fo r three decay modes of U-234. The WKB-integral is minimized with respe ct the necking and the elongation. A term which takes into account the effect of the diffuse surface is added to the deformation energy in t he framework of the macroscopic model of binary system with different charge densities. The effective masses are computed with more correct coordinates of deformation in order to include the variations of the a symmetry during the processes. Calculations are performed to obtain th e fission trajectories in a large range of mass-asymmetry including co ld fission, cluster emission and alpha-decay. Estimations of T-1/2 are reported.