2-DIMENSIONAL SEQUENCE OF SHAPES FOR COLD-FISSION OF FM-264

The neutron-rich Fm-264 should be the best cold-fissioning nucleus, ow ing to the strong shell effect of the doubly magic fragments Sn-132. T he optimum cold fission path in the plane of two independent shape coo rdinates, the separation distance R and of the radius of the light fra gment R(2), is determined. Werner-Wheeler inertia tensor and Yukawa-pl us-exponential deformation energy are used to calculate the action int egral. Microscopic shell and pairing corrections are based on the asym metric two-center single-particle model. Different variation laws R(2) = R(2)(R), for the fission trajectory were tested: polynomials of 2nd , 3rd, and 4th degree and an exponential function. The partial half-li fe for cold fission is estimated to be several orders of magnitude sho rter than that of alpha-decay.