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

被引：71

作者：

Oberstedt, A. ^{[1
,2
]}

Belgya, T. ^{[3
]}

Billnert, R. ^{[1
,4
]}

Borcea, R. ^{[4
]}

Brys, T. ^{[4
]}

Geerts, W. ^{[4
]}

Goeoek, A. ^{[5
]}

Hambsch, F. -J. ^{[4
]}

Kis, Z. ^{[3
]}

Martinez, T. ^{[6
]}

Oberstedt, S. ^{[4
]}

Szentmiklosi, L. ^{[3
]}

Takacs, K. ^{[3
]}

Vidali, M. ^{[4
]}

机构：

[1] Chalmers Tekniska Hogskola, S-41296 Gothenburg, Sweden

[2] Univ Orebro, Akad Nat Vetenskap Och Tekn, S-70182 Orebro, Sweden

[3] HAS, Ctr Energy, Inst Energy Secur & Environm Safety EKBI, H-1525 Budapest, Hungary

[4] Commiss European Communities, Joint Res Ctr IRMM, B-2440 Geel, Belgium

[5] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[6] CIEMAT, Dept Energy, Nucl Innovat Grp, E-28040 Madrid, Spain

来源：

PHYSICAL REVIEW C | 2013年 / 87卷 / 05期

关键词：

SCINTILLATION DETECTORS;

D O I：

10.1103/PhysRevC.87.051602

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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.

引用

页数：5

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