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.
|Title of host publication||Proceedings 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 Publication||Les Ulis, France|
|State||Published - 21 May 2008|
|Event||2007 International Conference on Nuclear Data for Science and Technology - CEA/OECD NEA, Nice|
Duration: 22 Apr 2007 → 27 Apr 2007
|Conference||2007 International Conference on Nuclear Data for Science and Technology|
|Period||2007-04-22 → 2007-04-27|