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Neutron inelastic scattering of 232 Th: measurements and beyond

Abstract : Gamma production cross sections have been obtained for 81 transitions in 232 Th from (n,n'γ), 11 in 231 Th from (n,2nγ) and 7 in 230 Th from (n,3nγ) reactions using prompt gamma spectroscopy. Incident neutron energies were determined using the neutron time-of-flight technique. Sources of uncertainty have been examined and their correlations have been computed. Total uncertainty on cross sections ranges from 4 to 20%. Obtained cross sections are in agreement with prior experiments, but are not well reproduced by the TALYS-1.8 reaction code using default parameters. During analysis, discrepancies between our findings and the Evaluated Nuclear Structure Data File (ENSDF) were noted. Future work related to the present experiment includes: improving theoretical models, quantifying the influence of the 232 Th inelastic neutron cross section on reactor core parameters, and conducting additional measurements.
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Eliot Party, Catalin. Borcea, Philippe Dessagne, Xavier Doligez, Grégoire. Henning, et al.. Neutron inelastic scattering of 232 Th: measurements and beyond. 5th International Workshop On Nuclear Data Evaluation for Reactor applications (WONDER-2018), Oct 2018, Aix en Provence, France. pp.03005, ⟨10.1051/epjconf/201921103005⟩. ⟨hal-02307897⟩

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