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Super-Asymmetric Fission Mode in 254Fm Nucleus Populated by 16O + 238U Reaction

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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 \({{E}_{{{\text{lab}}}}}\) = 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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ACKNOWLEDGMENTS

The authors acknowledge the support from the staff of the U400 cyclotron. We acknowledge with deep gratitude the constant interest in the experiments and the support of the directorate of the FLNR, JINR.

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Authors and Affiliations

  1. Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980, Dubna, Russia

    Tathagata Banerjee, E. M. Kozulin, K. B. Gikal, I. M. Itkis, G. N. Knyazheva, N. I. Kozulina, K. V. Novikov, I. N. Diatlov, I. V. Pchelintsev, A. N. Pan & I. V. Vorobiev

  2. Institute of Nuclear Physics, RK Ministry of Energy, 050032, Almaty, Kazakhstan

    A. N. Pan

  3. al Farabi Kazakh National University, 050040, Almaty, Kazakhstan

    A. N. Pan

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  1. Tathagata Banerjee
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Tathagata Banerjee, Kozulin, E.M., Gikal, K.B. et al. Super-Asymmetric Fission Mode in 254Fm Nucleus Populated by 16O + 238U Reaction. Phys. Part. Nuclei 53, 135–148 (2022). https://doi.org/10.1134/S1063779622020150

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  • DOI: https://doi.org/10.1134/S1063779622020150

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