Method for measuring prompt γ -rays generated by D-T neutrons bombarding a depleted uranium spherical shell

The prompt gamma -ray spectrum from depleted uranium (DU) spherical shells induced by 14 MeV D-T neutrons is measured. Monte Carlo (MC) simulation gives the largest prompt gamma flux with the optimal thickness of the DU spherical shells 3-5 cm and the optimal frequency of neutron pulse 1 MHz. The me...

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Bibliographic Details
Published in:Chinese physics C 2016-01, Vol.40 (1), p.14001-14010
Main Authors: Qin, Jian-Guo, Lai, Cai-Feng, Jiang, Li, Liu, Rong, Zhang, Xin-Wei, Ye, Bang-Jiao, Zhu, Tong-Hua
Format: Article
Language:English
Subjects:
Computer simulation
Depletion
Liquids
Mathematical analysis
Neutron flux
Optimization
Spherical shells
Uranium
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Summary:The prompt gamma -ray spectrum from depleted uranium (DU) spherical shells induced by 14 MeV D-T neutrons is measured. Monte Carlo (MC) simulation gives the largest prompt gamma flux with the optimal thickness of the DU spherical shells 3-5 cm and the optimal frequency of neutron pulse 1 MHz. The method of time of flight and pulse shape coincidence with energy (DC-TOF) is proposed, and the subtraction of the background gamma -rays discussed in detail. The electron recoil spectrum and time spectrum of the prompt gamma -rays are obtained based on a 2 double prime 2 double prime BC501A liquid scintillator detector. The energy spectrum and time spectrum of prompt gamma -rays are obtained based on an iterative unfolding method that can remove the influence of gamma -rays response matrix and pulsed neutron shape. The measured time spectrum and the calculated results are roughly consistent with each other. Experimental prompt gamma -ray spectrum in the 0.4-3 MeV energy region agrees well with MC simulation based on the ENDF/BVI.5 library, and the discrepancies for the integral quantities of gamma -rays of energy 0.4-1 MeV and 1-3 MeV are 9.2% and 1.1%, respectively.
ISSN:1674-1137
DOI:10.1088/1674-1137/40/1/014001