Abstract
Using the liquid-drop model, the authors have performed a systematic study of symmetrical fusion with a neck degree of freedom and tunnelling effects, the nuclear potential being calculated with the proximity approach. Barrier heights and positions are in very good agreement with experimental data when they are known (light-medium systems); the recent experimental data for the reactions 58Ni+58Ni and 64Ni+64Ni are investigated particularly. For heavier systems double-humped fusion barriers and isomeric states are predicted which strongly limit the complete fusion probability.
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