Calculating fission rates at high spin: Incorporation of rotational degrees of freedom in thermodynamically fluctuating axially symmetric systems

The methods presently used to calculate fission rates fail to correctly take into account the rotational degrees of freedom of compound nuclei rotating in three dimensions. The statistical model code JOANNE has been modified to correctly calculate the fission rates of classical thermodynamically fluctuating axially symmetric systems rotating in three dimensions. With this new code it is possible to reproduce evaporation residue cross sections, fission cross sections, and prescission neutron multiplicities from O-induced reactions, without the use of large fission delay times or large values of the viscosity of heated nuclear matter.

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