Dynamical Decay of a Trinuclear System in the Presence of Friction Forces in the Spontaneous Fission of Cf252

The dynamics of the rupture of the ternary system 70Ni + 50Ca + 132Sn formed at the spontaneous fission of 252Cf has been studied. The heaviest fragment 132Sn is separated first very easily and the behavior of the breakup of the 70Ni+50Ca system determines final directions of the angular distribution of the final products. The equations of motion with including microscopical friction forces between two contacting nuclei have been calculated. The friction force in the dynamical equations results in increase of decay time of the system only. The results of calculations show that the trajectory of the middle Ca nucleus is nearly perpendicular to the line connecting centers of two massive 70Ni and 132Sn nuclei if initial configuration is not collinear.