Abstract
The entrance channel in the 238U+238U reaction is investigated within the liquid-drop model, taking into account the effects of the nuclear proximity forces and allowing ellipsoidal deformations of the two colliding nuclei. A sudden transition occurs from strong oblate configurations to small prolate shapes when the attractive nuclear forces counterbalance the repulsive Coulomb forces. This only slightly affects the perpendicular moment of inertia and the quadrupole moment while the effective moment of inertia varies strongly. It is suggested that the angular distribution of the fragments is widely correlated with the degree of adiabaticity of the reaction and, therefore, with the relaxation time and the initial kinetic energy range.
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