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Report No.
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Effects of multichance fission on fission fragment mass distributions at high energies

Tanaka, Shoya; Hirose, Kentaro; Nishio, Katsuhisa; Aritomo, Yoshihiro*

Recently, fission-fragment mass distributions (FFMDs) were measured for $$^{237-240}$$U, $$^{239-242}$$Np, and $$^{241-244}$$Pu populated in the excitation-energy range from 10 to 60 MeV by multinucleon transfer channels in the reaction $$^{18}$$O + $$^{238}$$U at the Japan Atomic Energy Agency tandem facility. A persistence of predominantly asymmetric FFMDs was observed up to the highest measured excitation energy for all the studied nuclides. To understand this behavior, we use the fluctuation-dissipation model and employ Langevin equations to obtain FFMDs and clarify multichance fission (MCF) effects. FFMDs are calculated for twenty-nine compound nuclides $$^{231-234}$$Th, $$^{233-236}$$Pa, $$^{234-240}$$U, $$^{236-242}$$Np and $$^{238-244}$$Pu with the excitation energy range from 15 to 55 MeV. The calculation results show generally good agreement with experimental data. It was shown that a reliable understanding of the observed FFMDs can be obtained only by invoking MCF.

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