New measurement of $^{50}$Cr and $^{53}$Cr (n,$γ$) cross sections at n_TOF: a call for chromium nuclear data revision
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Pérez-Maroto, P. Guerrero, C. Casanovas, A. Fernández, B. Mendoza, E. Alcayne, V. Lerendegui-Marco, J. Domingo-Pardo, C. Quesada, J. M. Capote, R. Collaboration, the n_TOF |
| author_facet | Pérez-Maroto, P. Guerrero, C. Casanovas, A. Fernández, B. Mendoza, E. Alcayne, V. Lerendegui-Marco, J. Domingo-Pardo, C. Quesada, J. M. Capote, R. Collaboration, the n_TOF |
| contents | $^{50}$Cr and $^{53}$Cr are very relevant in criticality safety benchmarks related to nuclear reactors. The discrepancies of up to 30% between the neutron capture cross section evaluations have an important effect on the $k_{eff}$ and $k_{\infty}$ in criticality benchmarks particularly sensitive to chromium. In this work, the $^{50,53}$Cr(n,$γ$) cross sections are to be determined between 1 and 100 keV with an 8-10% accuracy following the requirements of the NEA High Priority Request List (HPRL) to solve the current discrepancies. We have measured these reactions by the time-of-flight technique at the EAR1 experimental area of the n_TOF facility, using an array of four C$_6$D$_6$ detectors with very low neutron sensitivity. The highly-enriched samples used are significantly thinner than in previous measurements, thus minimizing the multiple-scattering effects. We have produced, and analysed with the R-matrix analysis code SAMMY, capture yields featuring 33 resonances of $^{50}$Cr and 51 of $^{53}$Cr with an accuracy between 5% and 9%, hence fulfilling the requirements made by the NEA. The differential and integral cross sections have been compared to previous data and evaluations. The new measured $^{50,53}$Cr(n,$γ$) cross sections provide a valuable input for upcoming evaluations, which are deemed necessary given that the results presented herein do not support the increase in both cross sections proposed in the recent INDEN evaluation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_17161 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | New measurement of $^{50}$Cr and $^{53}$Cr (n,$γ$) cross sections at n_TOF: a call for chromium nuclear data revision Pérez-Maroto, P. Guerrero, C. Casanovas, A. Fernández, B. Mendoza, E. Alcayne, V. Lerendegui-Marco, J. Domingo-Pardo, C. Quesada, J. M. Capote, R. Collaboration, the n_TOF Nuclear Experiment $^{50}$Cr and $^{53}$Cr are very relevant in criticality safety benchmarks related to nuclear reactors. The discrepancies of up to 30% between the neutron capture cross section evaluations have an important effect on the $k_{eff}$ and $k_{\infty}$ in criticality benchmarks particularly sensitive to chromium. In this work, the $^{50,53}$Cr(n,$γ$) cross sections are to be determined between 1 and 100 keV with an 8-10% accuracy following the requirements of the NEA High Priority Request List (HPRL) to solve the current discrepancies. We have measured these reactions by the time-of-flight technique at the EAR1 experimental area of the n_TOF facility, using an array of four C$_6$D$_6$ detectors with very low neutron sensitivity. The highly-enriched samples used are significantly thinner than in previous measurements, thus minimizing the multiple-scattering effects. We have produced, and analysed with the R-matrix analysis code SAMMY, capture yields featuring 33 resonances of $^{50}$Cr and 51 of $^{53}$Cr with an accuracy between 5% and 9%, hence fulfilling the requirements made by the NEA. The differential and integral cross sections have been compared to previous data and evaluations. The new measured $^{50,53}$Cr(n,$γ$) cross sections provide a valuable input for upcoming evaluations, which are deemed necessary given that the results presented herein do not support the increase in both cross sections proposed in the recent INDEN evaluation. |
| title | New measurement of $^{50}$Cr and $^{53}$Cr (n,$γ$) cross sections at n_TOF: a call for chromium nuclear data revision |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2506.17161 |