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arXiv · 1507.03383

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

Jianguo Qin·Caifeng Lai·Li Jiang·Rong Liu·Xinwei Zhang·Bangjiao Ye·Tonghua Zhu
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Abstract

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"*2" 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 γ-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 agree 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.

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Jianguo Qin, Caifeng Lai, Li Jiang, Rong Liu, Xinwei Zhang, Bangjiao Ye, Tonghua Zhu. 2015-07-13. Method for measuring prompt gamma-rays generated by D-T neutrons bombarding a depleted uranium spherical shell. https://doi.org/10.1088/1674-1137%2F40%2F1%2F014001

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