Abstract
Neutron and fission fragment spectra following the180Hf(40Ar,f) reaction atElab=216MeV were measured. The following neutron total, pre- and post-scission multiplicities were extracted:Mntot=7.2±1.3,Mnpre=2.7±0.9,Mnpost=4.5±0.9. The average temperature parameters of the neutron spectra areTpre=(1.63±0.16) MeV andTpost=(1.14±0.26)MeV. The mean total kinetic energy of the fission fragments is TKE=(166±10) MeV and the measured width is σTKE=17.3MeV. The width of the fragment mass distribution is σA=18.3u. The same reaction was analyzed using a modified statistical code which includes nuclear dissipation effects and particle and γ-ray emission in the equilibrium compound nucleus state and saddle-to-scission transition. The extracted value of nuclear friction coefficient indicates over-damped large-scale fission motion. The obtained total fission time τfiss=9·10−20s is in agreement with other existing data.
Published Version
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