Measurement and analysis of thorium fission rate in a polyethylene shell with a D-T neutron source

•Associated angular dependences of the source neutron energy and intensity was given.•Two sets of fission yields from evaluated libraries were considered and applied.•Calculated results employing ENDF/B-VII.0 agreed with the experimental ones best.•Small discrepancies exist between thorium fission c...

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Bibliographic Details
Published in:Fusion engineering and design 2016-12, Vol.113, p.177-182
Main Authors: Zheng, Lei, Yang, Yiwei, Liu, Zhujun, Liu, Rong, Jiang, Li, Wang, Mei
Format: Article
Language:English
Subjects:
232Th fission rate
Activation method
Cross-sections
D-T neutron source
Fission
Integral experiment
Neutrons
Nuclear fission
Polyethylene
Polyethylene shell
Polyethylenes
Thorium
Uncertainty
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Summary:•Associated angular dependences of the source neutron energy and intensity was given.•Two sets of fission yields from evaluated libraries were considered and applied.•Calculated results employing ENDF/B-VII.0 agreed with the experimental ones best.•Small discrepancies exist between thorium fission cross section evaluated libraries. In order to validate the 232Th fission cross section, an integral experiment was carried out using the activation method in a polyethylene shell with a D-T neutron source. Thorium samples were arranged in the 0° direction to the incident D+ beam. The 232Th fission rate was determined by measuring the 151.195keV characteristic γ ray emitted from the fission fragment 85mKr, and the experimental uncertainties were about 5.3%. MCNP calculation results employing ENDF/B-VII.0, JENDL-3.3, JENDL-4.0 libraries are in good agreement with that of experiments within uncertainties except that employing ENDF/B-VII.1 (∼6.5%). The experiment results can be used to re-evaluate the 232Th fission cross section.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2016.09.013