Measurement of the 236U(n,f) Cross Section in the Neutron Energy Range from 0.5 eV up to 25 keV

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  • Cyriel Wagemans
  • Liesbeth De Smet
  • Sofie Vermote
  • Jan Heyse
  • Jaak Van Gils
  • Olivier Serot

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The 236U(n,f) cross section has been measured in the energy range from 0.5 eV to 25 keV at the Geel Electron Linear Accelerator neutron time-of-flight facility of the Institute for Reference Materials and Measurements in Geel, Belgium. A highly enriched 236U sample was mounted back-to-back with a 10B sample in the center of a Frisch-gridded ionization chamber, hence realizing a 2pi detection geometry. A 235U(n,f) cross-section control measurement was performed in the same experimental conditions. Special attention has been given to the fission resonance integral I_f and to the strongest resonance at 5.45 eV, for which a resonance analysis has been performed yielding Gamma_f = 1.7 µeV. Both values are highly overestimated in the literature.


Original languageEnglish
Pages (from-to)200-206
JournalNuclear Science and Engineering
Issue number2
Publication statusPublished - 1 Oct 2008


  • nuclear reactions, neutron, cross section, measurement, fission, (n, f), 236U, time-of-flight, resonance, IRMM, GELINA, 235U, 10B, En=0.5eV-25keV

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