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Spectrum of prompt fission neutrons from 235U(n, F)

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A new matrix of the spectra of prompt fission neutrons for the reaction 235U(n, F) has been obtained. The evaluated spectrum of prompt fission neutrons reproduces the measured data for incident neutrons with energy from thermal to 14.7 MeV. A solution is proposed for the problem of inconsistency of the integral testing of the systems with a thermal spectrum and differential measurements of the spectra of prompt fission neutrons. The matrix obtained for the spectra of prompt neutrons for 235U(n, F) eliminates the considerable discrepancy between the differential and integral experiments. The description of the integral experiments for compositions with a fast neutron spectrum revealed the compensation effect in the multiplication factor Keff, due to the difference in the shapes of the spectra of prompt fission neutrons, the present work and known libraries. The description of systems with a thermal neutron spectrum shows that the positive shift of the computed Keff is explained by the influence of the low-energy neutrons.

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Authors and Affiliations

  1. Joint Institute for Energy and Nuclear Research, Minsk, Belarus

    V. M. Maslov & N. A. Tetereva

  2. State Science Center of the Russian Federation – Leipunskii Institute for Physics and Power Engineering (GNTs RF – FEI), Obninsk, Russia

    V. G. Pronyaev, A. B. Kagalenko & K. I. Zolotarev

  3. IAEA, Vienna, Austria

    R. Capote

  4. Atomic Energy Commission of France, Center for Military Studies, Paris, France

    T. Granier & B. Morillon

  5. Institute of Standard Materials and Measurements at the Joint Research Center of the European Commission, Brussels, Belgium

    F.-J. Hambsch

  6. Center for Thermonuclear Research, Culham, Great Britain, United Kingdom

    J.-C. Sublet

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  1. V. M. Maslov
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  3. V. G. Pronyaev
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  4. A. B. Kagalenko
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Translated from Atomnaya Énergiya, Vol. 108, No. 6, pp. 352–362, June, 2010.

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Maslov, V.M., Tetereva, N.A., Pronyaev, V.G. et al. Spectrum of prompt fission neutrons from 235U(n, F). At Energy 108, 432–443 (2010). https://doi.org/10.1007/s10512-010-9313-0

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