Abstract
The thermal-neutron-induced fission cross-section of 238U was measured at an intense and very clean thermal-neutron beam of the Grenoble high-flux reactor. The best 238U sample material used contained only 12 ppb of 235U. The fission fragments were detected with surface barrier detectors. Relative to a thermal fission cross-section of 587.6 barn for 235U, a value of (11 ± 2) μbarn was obtained for the 238U fission cross-section. By comparing this result with 238U(n, f) measurements in the resonance region, the existence of a negative resonance or resonances in 239U is demonstrated.
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