Abstract
The decay of coherent collective modes into fission is discussed, focussing mainly on the decay of isobaric analog resonances (IAR) and isoscalar giant resonances in the actinide region. Results from (3He,tf) experiments on 232Th and 238U are presented from which it is deduced that the spreading widths Γ↓ of the IAR are 90±20 keV for 232Th and 142±37 keV for 238U compared to total widths of 306±20 keV and 380±40 keV for 232Th and 238U, respectively. For the isoscalar giant resonances (GR) around 11 MeV in 238U, it is concluded that they have fission probabilities less than the GDR, indicating more equilibration for the isovector GDR than for the isoscalar GR at ≈11 MeV.KeywordsCompound NucleusProton DecayFission FragmentNeutron EmissionGiant Dipole ResonanceThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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