High-precision prompt-γ-ray spectral data from the reaction 241Pu(nth, f)

被引：37

作者：

Oberstedt, S. ^{[1
]}

Billnert, R. ^{[1
,2
]}

Belgya, T. ^{[3
]}

Brys, T. ^{[1
]}

Geerts, W. ^{[1
]}

Guerrero, C. ^{[4
,5
]}

Hambsch, F. -J. ^{[1
]}

Kis, Z. ^{[3
]}

Moens, A. ^{[1
]}

Oberstedt, A. ^{[2
,6
]}

Sibbens, G. ^{[1
]}

Szentmiklosi, L. ^{[3
]}

Vanleeuw, D. ^{[1
]}

Vidali, M. ^{[1
]}

机构：

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

[2] Chalmers Tekn Hogskola, Fundamental Fys, S-41296 Gothenburg, Sweden

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

[4] CERN, Dept Phys, CH-1211 Geneva 23, Switzerland

[5] Univ Seville, Fac Fis, Seville 41012, Spain

[6] OSSOLUTIONS Consulting, S-70353 Orebro, Sweden

来源：

PHYSICAL REVIEW C | 2014年 / 90卷 / 02期

关键词：

SCINTILLATION DETECTORS; FISSION; NEUTRON;

D O I：

10.1103/PhysRevC.90.024618

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 the first high-precision prompt-gamma-ray spectral measurements from the reaction Pu-241(n(th), f). Apart from one recent experiment, no data are reported in the literature for this fissioning system, which motivated a new dedicated experiment. We have measured prompt-fission gamma rays with three cerium-doped LaBr3 (two 5.08 cm x 5.08 cm and one 7.62 cm x 7.62 cm) and one CeBr3 (5.08 cm x 5.08 cm) scintillation detectors, which all exhibit excellent timing and good energy resolution. The average gamma-ray multiplicity was determined to be (nu) over bar (gamma) = (8.21 +/- 0.09) per fission, the average energy to be epsilon(gamma) = (0.78 +/- 0.01) MeV, and the total energy to be E-gamma,E-tot = (6.41 +/- 0.06) MeV as the weighted average from all detectors. Since the results from all detectors are in excellent agreement, and the total released gamma energy is modestly higher than the one in the present evaluated nuclear data files, we suspect that the underestimation of the prompt-gamma heating in nuclear reactors is due to fast-neutron-induced fission on U-238 or rather from fission induced by gamma rays from neutron capture in the construction material.

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