Improved values for the characteristics of prompt-fission γ-ray spectra from the reaction 235U(nth,f)

A. Oberstedt, T. Belgya, R. Billnert, R. Borcea, T. Bryå, W. Geerts, A. Göök, F. J. Hambsch, Z. Kis, T. Martinez, S. Oberstedt, L. Szentmiklósi, K. Takàcs, M. Vidali

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Abstract

In this paper we present results from measurements of prompt γ rays from the thermal neutron induced fission of 235U. Photons were measured in coincidence with fission fragments with cerium-doped LaCl3 and LaBr3 as well as CeBr3 scintillation detectors, which offer an intriguing combination of excellent timing resolution and good resolving power. The spectra measured with all employed detectors are in excellent agreement with respect to their shapes. Characteristic parameters were extracted for a γ-energy range from 0.1 to 6.0 MeV and the results obtained with several detectors were averaged. From that, the average emission yield of prompt-fission γ rays was determined to be ν ̄γ=(8.19±0.11) per fission, the average energy per photon to be εγ=(0.85±0.02) MeV, and the total energy to be Eγ,tot=(6.92±0.09) MeV. The uncertainties are much lower than the 7.5% requested for the modeling of advanced nuclear reactor cores. Estimating the influence of γ rays with energies between 6 and 10 MeV on the values determined in this work revealed a negligible deviation of the order of the found uncertainties.

Original languageEnglish
Article number051602
JournalPhysical Review C - Nuclear Physics
Volume87
Issue number5
DOIs
Publication statusPublished - May 22 2013

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fission
rays
detectors
reactor cores
energy
nuclear reactors
photons
cerium
thermal neutrons
scintillation
estimating
time measurement
fragments
deviation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Improved values for the characteristics of prompt-fission γ-ray spectra from the reaction 235U(nth,f). / Oberstedt, A.; Belgya, T.; Billnert, R.; Borcea, R.; Bryå, T.; Geerts, W.; Göök, A.; Hambsch, F. J.; Kis, Z.; Martinez, T.; Oberstedt, S.; Szentmiklósi, L.; Takàcs, K.; Vidali, M.

In: Physical Review C - Nuclear Physics, Vol. 87, No. 5, 051602, 22.05.2013.

Research output: Contribution to journalArticle

Oberstedt, A, Belgya, T, Billnert, R, Borcea, R, Bryå, T, Geerts, W, Göök, A, Hambsch, FJ, Kis, Z, Martinez, T, Oberstedt, S, Szentmiklósi, L, Takàcs, K & Vidali, M 2013, 'Improved values for the characteristics of prompt-fission γ-ray spectra from the reaction 235U(nth,f)', Physical Review C - Nuclear Physics, vol. 87, no. 5, 051602. https://doi.org/10.1103/PhysRevC.87.051602
Oberstedt, A. ; Belgya, T. ; Billnert, R. ; Borcea, R. ; Bryå, T. ; Geerts, W. ; Göök, A. ; Hambsch, F. J. ; Kis, Z. ; Martinez, T. ; Oberstedt, S. ; Szentmiklósi, L. ; Takàcs, K. ; Vidali, M. / Improved values for the characteristics of prompt-fission γ-ray spectra from the reaction 235U(nth,f). In: Physical Review C - Nuclear Physics. 2013 ; Vol. 87, No. 5.
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