Improved values for the characteristics of prompt-fission gamma-ray spectra from the reaction U-235(n(th), f)
Artikel i vetenskaplig tidskrift, 2013

In this paper we present results from measurements of prompt gamma rays from the thermal neutron induced fission of U-235. 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 gamma-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 gamma rays was determined to be (nu) over bar (gamma) = (8.19 +/- 0.11) per fission, the average energy per photon to be epsilon(gamma) = (0.85 +/- 0.02) MeV, and the total energy to be E-gamma,E-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 gamma 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.


Andreas Oberstedt

Chalmers, Teknisk fysik, Subatomär fysik

T. Belgya

Magyar Tudomanyos Akademia

Robert Billnert

Chalmers, Teknisk fysik, Subatomär fysik

R. Borcea

EU Joint Research Centre (JRC)

T. Brys

EU Joint Research Centre (JRC)

W. Geerts

EU Joint Research Centre (JRC)

A. Gook

Technische Universität Darmstadt

F. J. Hambsch

EU Joint Research Centre (JRC)

Z. Kis

Magyar Tudomanyos Akademia

T. Martinez

Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (Ciemat)

S. Oberstedt

EU Joint Research Centre (JRC)

L. Szentmiklosi

Magyar Tudomanyos Akademia

K. Takacs

Magyar Tudomanyos Akademia

M. Vidali

EU Joint Research Centre (JRC)

Physical Review C - Nuclear Physics

0556-2813 (ISSN) 1089-490X (eISSN)

Vol. 87 5 Art. no. 051602- 051602


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