Evolution of uranium fission-fragment charge yields with neutron number

Strong effect of multi-chance fission on yield asymmetries
  • Peter MöllerEmail author
  • Christelle Schmitt
Regular Article - Theoretical Physics


We use the Brownian shape-motion model, with its recent extensions, which allow modeling of odd-even staggering, to calculate the evolution of fission-fragment charge distributions with neutron number for the compound-system sequence 234U, 236U, 238U, and 240U. We compare to experimental data where available, for neutron- and electromagnetic-induced fission over a compound-nucleus excitation energy range from about 6 to 20 MeV. A notable result of the study is that the evolution of the location of the peak charge yield from \(Z=54\) in 234U towards \(Z=52\) in heavier isotopes, seen in the experimental data, is present also in the calculated yields. We further show that to describe yields at higher compound-nucleus excitation energies, then, already at 20 MeV, it is necessary to take multi-chance fission into account.


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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Theoretical DivisionLos Alamos National LaboratoryLos AlamosUSA
  2. 2.Grand Accélérateur National d’Ions LourdsCEA/DSM-CNRS/IN2P3CaenFrance

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