Improved 242 Pu(n, γ) thermal cross section combining activation and prompt gamma analysis

J. Lerendegui-Marco, C. Guerrero, T. Belgya, B. Maróti, K. Eberhardt, Ch E. Düllmann, A. R. Junghans, C. Mokry, J. M. Quesada, J. Runke, P. Thörle-Pospiech

Research output: Contribution to journalArticle

Abstract

A good knowledge of the radiative capture cross section of 242 Pu is required for innovative nuclear reactor studies, especially for MoX fuel reactors. However, the experimental data available show discrepancies in the energy regions of interest: the thermal point and the keV region. Previous experimental results of the thermal cross section deviate from each other by 20% and these discrepancies are reflected also in the evaluated libraries, each of them giving more credit to different data sets. A recent measurement by Genreith et al. did not succeed to solve the existing discrepancy due to the large uncertainties and correction factors in the analysis. This work presents a new measurement of the thermal capture cross section of 242 Pu carried out in the Budapest Research Reactor using the same thin targets of a previous measurement at n_TOF-EAR1, each containing 30mg of 99.995% pure 242 Pu. The combined analysis of the full prompt γ-ray spectrum and the 243 Pu decay has led to three compatible values for the thermal cross section. Their average value, 18.9(9)b, has an improved accuracy compared to recent measurements. Leaving aside the activation value of Genreith using an outdated intensity value for the 84 keV decay line of 243 Pu , our average result is in very good agreement with the JEFF-3.2 evaluation and all the previous measurements, with the exception of the highest value 22.5(11)b reported by Marie et al., which has a strong influence in the ENDF evaluation.

Original languageEnglish
Article number63
JournalEuropean Physical Journal A
Volume55
Issue number5
DOIs
Publication statusPublished - May 1 2019

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activation
cross sections
absorption cross sections
evaluation
nuclear fuels
nuclear reactors
decay
rays
reactors
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Lerendegui-Marco, J., Guerrero, C., Belgya, T., Maróti, B., Eberhardt, K., Düllmann, C. E., ... Thörle-Pospiech, P. (2019). Improved 242 Pu(n, γ) thermal cross section combining activation and prompt gamma analysis European Physical Journal A, 55(5), [63]. https://doi.org/10.1140/epja/i2019-12730-6

Improved 242 Pu(n, γ) thermal cross section combining activation and prompt gamma analysis . / Lerendegui-Marco, J.; Guerrero, C.; Belgya, T.; Maróti, B.; Eberhardt, K.; Düllmann, Ch E.; Junghans, A. R.; Mokry, C.; Quesada, J. M.; Runke, J.; Thörle-Pospiech, P.

In: European Physical Journal A, Vol. 55, No. 5, 63, 01.05.2019.

Research output: Contribution to journalArticle

Lerendegui-Marco, J, Guerrero, C, Belgya, T, Maróti, B, Eberhardt, K, Düllmann, CE, Junghans, AR, Mokry, C, Quesada, JM, Runke, J & Thörle-Pospiech, P 2019, ' Improved 242 Pu(n, γ) thermal cross section combining activation and prompt gamma analysis ', European Physical Journal A, vol. 55, no. 5, 63. https://doi.org/10.1140/epja/i2019-12730-6
Lerendegui-Marco, J. ; Guerrero, C. ; Belgya, T. ; Maróti, B. ; Eberhardt, K. ; Düllmann, Ch E. ; Junghans, A. R. ; Mokry, C. ; Quesada, J. M. ; Runke, J. ; Thörle-Pospiech, P. / Improved 242 Pu(n, γ) thermal cross section combining activation and prompt gamma analysis In: European Physical Journal A. 2019 ; Vol. 55, No. 5.
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