Measurement of the 236U(n,f) cross section as a function of the neutron energy

Research output: Contribution to report/book/conference proceedingsIn-proceedings paper


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

Documents & links


The 236U(n,f) cross section has been measured in the neutron energy region from 0.5 eV to 25 keV at the GELINA neutron facility of the IRMM in Geel, Belgium. A highly enriched 236U sample was mounted back-to-back with a 10B sample in the centre of a Frisch-gridded ionisation chamber; a control measurement was performed with a 235U sample in the same configuration. Besides a dominant resonance at 5.45 eV, for which a resonance analysis was performed, the next resonance (cluster) only occurs at about 1.3 keV. It is demonstrated that the fission resonance integral and the thermal fission cross section adopted in all commonly used evaluated data libraries are too large by two orders of magnitude.


Original languageEnglish
Title of host publicationProceedings of the International Conference on Nuclear Data for Science and Technology, April 22-27, 2007, Nice, France, editors O.Bersillon, F.Gunsing, E.Bauge, R.Jacqmin, and S.Leray
Place of PublicationLes Ulis, France
Publication statusPublished - 21 May 2008
Event2007 International Conference on Nuclear Data for Science and Technology - CEA/OECD NEA, Nice, France
Duration: 22 Apr 200727 Apr 2007


Conference2007 International Conference on Nuclear Data for Science and Technology


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

ID: 116190