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

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

    Research outputpeer-review

    Abstract

    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
    Pages487-490
    Volume2
    StatePublished - 21 May 2008
    Event2007 International Conference on Nuclear Data for Science and Technology - CEA/OECD NEA, Nice
    Duration: 22 Apr 200727 Apr 2007

    Conference

    Conference2007 International Conference on Nuclear Data for Science and Technology
    Country/TerritoryFrance
    CityNice
    Period2007-04-222007-04-27

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