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Evolution of uranium fission-fragment charge yields with neutron number

Strong effect of multi-chance fission on yield asymmetries

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Abstract.

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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Authors and Affiliations

  1. Theoretical Division, Los Alamos National Laboratory, 87545, Los Alamos, NM, USA

    Peter Möller

  2. Grand Accélérateur National d’Ions Lourds, CEA/DSM-CNRS/IN2P3, 14076, Caen, France

    Christelle Schmitt

Authors
  1. Peter Möller
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Correspondence to Peter Möller.

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Communicated by N. Alamanos

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Möller, P., Schmitt, C. Evolution of uranium fission-fragment charge yields with neutron number. Eur. Phys. J. A 53, 7 (2017). https://doi.org/10.1140/epja/i2017-12188-6

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  • DOI: https://doi.org/10.1140/epja/i2017-12188-6

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