Measurement of the neutron-induced capture-to-fission cross section ratio in 233U at LANSCE
Résumé
The neutron-induced capture-to-fission cross section ratio of 233U has been measured at the Los Alamos
Neutron Science Center at Los Alamos National Laboratory in the energy range from 0.7 eV to 250 keV. The
detector setup combines the Detector for Advanced Neutron Capture Experiments (DANCE) to measure γ rays
generated from both capture and fission reactions, and the neutron detector array at DANCE to measure fission
neutrons. This is the first measurement of the capture-to-fission ratio between 2 and 30 keV. The evaluations are
in good agreement with the results in the resolved resonance region. In both the unresolved resonance region and
the fast neutron region, a lower capture-to-fission ratio is obtained in this work from 10 to 150 keV compared
to current evaluations, while good agreement with the experimental data and the evaluations is found above
150 keV. Statistical model calculations were performed to compare with the experimental data. Significantly
reduced γ was required to reproduce the measured dat
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