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Author  |
Nu-Ball Collaboration (Chatel, C. et al); Algora, A. |
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Title |
Inelastic neutron scattering on 238U with γ-ray coincidence spectroscopy |
Type |
Journal Article |
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Year |
2026 |
Publication |
Physical Review C |
Abbreviated Journal |
Phys. Rev. C |
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Volume |
113 |
Issue |
6 |
Pages |
064320 - 24pp |
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Abstract |
Improvement of the accuracy of neutronics simulation of actual or future reactor designs is essential and requires a better knowledge of the core neutron population. The reactor neutron population is partially driven by (n, xn) reactions that change the number and decrease the energy of the neutrons. However, the cross sections of these reactions are currently not measured with sufficient precision. This is particularly the case for the neutron inelastic-scattering cross section of U-238, which represents around 90%-95% of the mass of fuel in present and many future reactor core designs. It therefore features on the High Priority Request List for measurement improvement. This cross section can be measured using prompt gamma-ray spectroscopy coupled to neutron time-of-flight measurements, where the total (n, n') cross section can be deduced from a combination of the measured (n, n'gamma) partial cross sections and the level scheme information. The knowledge of the U-238 level scheme is still very incomplete, inducing significant uncertainties on the resulting inelastic-scattering cross section. Therefore, an effort has recently been carried out to experimentally revisit the U-238 decay scheme by performing high-resolution coincidence spectroscopy of the U-238(n, n') reaction. To obtain detailed level scheme information, the nu-Ball gamma spectrometer was coupled to the LICORNE directional neutron source of the ALTO facility, allowing the study of inelastic scattering of fast neutrons (0.5-3 MeV) on U-238 via gamma-gamma coincidence spectroscopy. Coincidence matrices obtained during the first and the second.-Ball campaigns were analyzed using the RadWare ESCL8R software. 110 gamma transitions and 60 levels registered in the Evaluated Nuclear Structure Data File database have been confirmed, and 158 new gamma transitions and 58 new levels have been found. Although not exhaustive, the U-238 level scheme information has been significantly improved, and its completeness has been estimated to be up to 1.7214 MeV compared with 1.27854 MeV at present. It is hence expected to decrease the uncertainties of U-238 (n, n') cross sections, which is needed for accurate reactor core modeling. |
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Address |
[Chatel, Carole; Dessagne, Philippe; Henning, Greg; Kerveno, Maelle; Didierjean, F.; Duchene, G.; Ljungvall, J.; Moukaddam, M.] Univ Strasbourg, CNRS, UMR 7178, IPHC,DRS, 23 Rue Loess, F-67037 Strasbourg, France, Email: carole.chatel@eli-np.ro |
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Publisher |
Amer Physical Soc |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
2469-9985 |
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Notes |
WOS:001822313000001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7339 |
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