On the fission of⁵⁶Ni and⁴⁸Cr rotating nuclei

The symmetric and asymmetric fission of the 56Ni and 48Cr rotating nuclei has been studied within the generalized liquid-drop model including the nuclear proximity energy. The selected shape sequence allows the rapid formation of a neck while keeping spherical ends. The potential barrier is a scission barrier standing at large deformations which hinders the fission process even at very high spins. Hyperdeformed minima appear at the foot of the fission barrier for sufficiently high angular momenta. These quasi-molecular configurations might correspond to some experimentally observed resonances at high angular momenta while, for lower spins, the fission barriers are sufficiently high and wide to allow fusion-fission phenomena.

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