Super-Asymmetric Fission Mode in 254Fm Nucleus Populated by 16O + 238U Reaction
Tathagata Banerjee Kozulin E.M. Gikal K.B. Itkis I.M. Knyazheva G.N. Kozulina N.I. Novikov K.V. Diatlov I.N. Pchelintsev I.V. Pan A.N. Vorobiev I.V.
April 2022Pleiades journals
Physics of Particles and Nuclei
2022#53Issue 2135 - 148 pp.
Abstract: The mass-energy distributions of fission fragments of 254Fm compound nucleus formed in the reaction 16O + 238U have been measured at two lab energies $${{E}_{{{ ext{lab}}}}}$$ = 89 and 101 MeV. The experimental data have been described by the multimodal random neck-rupture model. Channel probabilities and the characteristics of different fission modes are obtained and discussed in details. At ∼45 MeV excitation, the enhancement of the mass yield (~10–2%) in the region 60–70 u for the light fragment is observed. This can be explained by the influence of Z = 28 shell closure. This signature of super-asymmetric fission becomes zero at the higher excitation energy (~56 MeV), expectedly. The fission fragment mass distribution widths show a linear dependence with the measured energies.
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Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Institute of Nuclear Physics, RK Ministry of Energy, Almaty, 050032, Kazakhstan
al Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Flerov Laboratory of Nuclear Reactions
Institute of Nuclear Physics
al Farabi Kazakh National University
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