MASS PARAMETERS FOR A DINUCLEAR SYSTEM

A microscopical method is proposed to derive the diagonal and nondiago nal components of the inertia tenser for a dinuclear system formed in the heavy-ion collision at low energy. The coupling between different modes of motion for the various mass asymmetries and fragment separati ons is analyzed. The definition of a neck parameter for a dinuclear sy stem is proposed. It is shown that the coupling of the radial and mass -asymmetry modes is weak for almost symmetric configuration but it enh ances significantly as the asymmetry increases.