Systematics for (n,2n) excitation functions in the neutron energy between 13.4 and 14.9MeV

A systematics of (n,2n) partial excitation functions was studied on the basis of our 58 sets of experimental data measured using intense neutron source facilities of FNS at the Japan Atomic Energy Agency and of OKTAVIAN at Osaka University. The empirically predictive formulas based on the evaporatio...

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Bibliographic Details
Published in:Annals of nuclear energy 2011-02, Vol.38 (2-3), p.637-646
Main Authors: Hayashi, Hiroaki, Sakane, Hitoshi, Shibata, Michihiro, Kawade, Kiyoshi, Kasugai, Yoshimi, Ikeda, Yujiro, Iida, Toshiyuki
Format: Article
Language:English
Subjects:
Atomic properties
Energy (nuclear)
Energy of formation
Excitation
Neutron sources
Nuclear power generation
Nuclear reactor components
Slopes
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Summary:A systematics of (n,2n) partial excitation functions was studied on the basis of our 58 sets of experimental data measured using intense neutron source facilities of FNS at the Japan Atomic Energy Agency and of OKTAVIAN at Osaka University. The empirically predictive formulas based on the evaporation theory are applicable for the neutron energy between 13.4 and 14.9MeV, and in the mass range between 14 and 238. About 83% of the cross sections and the slopes of excitation functions can be reproduced within an uncertainty of 15%. The formulas were expressed in terms of a mass number A, an asymmetry parameter S =(N a degree Z)/A, and threshold energies of the (n,2n) and (n,3n) reactions, where N and Z are the neutron and proton numbers for the target nuclei, respectively. The excitation functions were well reproduced for the nuclei in the region with S
ISSN:0306-4549
DOI:10.1016/j.anucene.2010.09.005