Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 53, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1140/epja/i2017-12188-6
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Funding
- NNSA of the U.S. Department of Energy at Los Alamos National Laboratory [DE-AC52-06NA25396]
- FUSTIPEN (French-U.S. Theory Institute for Physics with Exotic Nuclei) under DOE [DE-FG02-10ER41700]
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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 U-234, U-236, U-238, and U-240. We compare to experimental data where available, for neutron-and electromagnetic-induced fission over a compound-nucleus excitation energy range from about 6 to 20MeV. A notable result of the study is that the evolution of the location of the peak charge yield from Z = 54 in U-234 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 20MeV, it is necessary to take multi-chance fission into account.
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