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Classification of T-odd asymmetries for prescission and evaporated light particles in ternary and quaternary nuclear fission induced by cold polarized neutrons

  • Proceedings of the LXV International Conference “Nucleus 2015. New Horizons in Nuclear Physics, Nuclear Engineering, Femto- and Nanotechnologies” (LXV International Meeting on Nuclear Spectroscopy and Nuclear Structure) (St. Petersburg, June–July 201
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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

A unified mechanism of the emergence of T-odd ROT- and TRI-asymmetries is proposed for describing experimental T-odd asymmetry coefficients D(θ) in the angular distributions of prescission alphaparticles that are emitted in true ternary and quaternary nuclear fission reactions induced by cold polarized neutrons. The mechanism is related to the different ways in which the Coriolis interaction of the total spin of a polarized compound fissile nucleus with the orbital moment of alpha-particles affects even (for ROT-asymmetries) and odd (for TRI-asymmetries) components of the amplitude of an undisturbed angular distribution of emitted alpha-particles. Coefficients D ROT(θ) and D TRI(θ) derived with this mechanism for T-odd ROT- and TRI-asymmetries successfully describe the dependences of corresponding experimental coefficients for 235U and 239Pu nuclei over the range of angles θ, and for the 233U nucleus in the angular range of 60° < θ < 110°. It is explained why only ROT-type T-odd asymmetries emerge for evaporated neutrons and γ-quanta emitted by fission fragments in similar reactions if we allows for the Coriolis interaction of the total spin of the compound fissile nucleus with the orbital moments of the fission fragments and the wriggling vibrations of the above nucleus near its scission point.

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Authors and Affiliations

  1. Voronezh State University, Voronezh, 394018, Russia

    S. G. Kadmensky & D. E. Lyubashevsky

  2. Konstantinov Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute,”, Gatchina, Leningrad oblast, 188300, Russia

    V. E. Bunakov

Authors
  1. S. G. Kadmensky
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  2. V. E. Bunakov
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  3. D. E. Lyubashevsky
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Corresponding author

Correspondence to S. G. Kadmensky.

Additional information

Original Russian Text © S.G. Kadmensky, V.E. Bunakov, D.E. Lyubashevsky, 2016, published in Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2016, Vol. 80, No. 8, pp. 1015–1020.

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Kadmensky, S.G., Bunakov, V.E. & Lyubashevsky, D.E. Classification of T-odd asymmetries for prescission and evaporated light particles in ternary and quaternary nuclear fission induced by cold polarized neutrons. Bull. Russ. Acad. Sci. Phys. 80, 927–932 (2016). https://doi.org/10.3103/S1062873816080220

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  • DOI: https://doi.org/10.3103/S1062873816080220

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