High resolution measurement of the 234U(n,f) cross section in the neutron energy range from 0.5 eV to 100 keV

The U-234(n,f) cross section has been measured in the energy rangefrom 0.5 eV to 100 keV at the GELINA neutron time-of flight facility of the Institute for Reference Materials and Measurements in Geel using highly enriched U-234 samples. Two independent measurements were performed: one in a low detection geometry (15% of 2 pi) and another in a 2 pi detection geometry. A U-235(n,f) cross-section measurement was Performed under the same experimental conditions, allowing a reliable correction for the U-235(n,f) contribution to the yield. Special attention has been given to the strongest resonance at 5.16eV and to the fission resonance integral I-f for which large discrepancies are reported in the literature.