Evolution of uranium fission-fragment charge yields with neutron number. Strong effect of multi-chance fission on yield asymmetries

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 20MeV. 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 20MeV, it is necessary to take multi-chance fission into account.
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http://hal.in2p3.fr/in2p3-01472105
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Submitted on : Monday, February 20, 2017 - 3:22:27 PM
Last modification on : Thursday, February 1, 2018 - 1:35:23 AM

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P. Möller, C. Schmitt. Evolution of uranium fission-fragment charge yields with neutron number. Strong effect of multi-chance fission on yield asymmetries. European Physical Journal A, EDP Sciences, 2017, 53, pp.7. ⟨10.1140/epja/i2017-12188-6⟩. ⟨in2p3-01472105⟩

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