# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (9): 127

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### Compact lithium-glass neutron beam monitor for SANS at CSNS

Ke Zhou 1,2,3  Jian-Rong Zhou 2,3 Yu-Shou Song 1  Xiao-Juan Zhou 2,3  Zhao-Yang Xie 1,2,3  Gui-An Yang 2,3  Yan-Feng Wang 2,3  Yuan-Bo Chen 2,3,4  Zhi-Jia Sun 2,3,4

1. 1 Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China
2 Dongguan Neutron Science Center, Dongguan 523803, China
3 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
4 State Key Laboratory of Particle Detection and Electronics, Beijing 100049, China
• Contact: Yu-Shou Song E-mail:songyushou80@163.com
• Supported by:

This work was supported by the National Key R&D Program of China (No. 2017YFA0403702), the Instrument Developing Project of the Chinese Academy of Sciences (No. YZ201512), and the National Natural Science Foundation of China (Nos. 11635012, 11405191, and 11205036).

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Ke Zhou, Jian-Rong Zhou, Yu-Shou Song, Xiao-Juan Zhou, Zhao-Yang. Compact lithium-glass neutron beam monitor for SANS at CSNS.Nuclear Science and Techniques, 2018, 29(9): 127
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Abstract:

A small-angle scattering neutron spectrometer for material research is under construction at the China Spallation Neutron Source. An intervening neutron beam monitor behind the sample is needed to measure the beam intensity in order to reduce the measurement uncertainty caused by beam fluctuation. Considering the mobility requirement and limited space, we proposed a compact monitor using a type of lithium-glass scintillator provided by China Building Materials Academy. Its performance was studied experimentally using 252Cf and 60Co sources. The neutron light yield of the selected scintillator was measured to be 5.3× 103 photons/neutron. The feasibility of n-gamma discrimination using the charge comparison method was verified. By using the Geant4 toolkit, the monitor was modeled with precise physical processes including neutron tracking, scintillation, and optical photon transmission. The gamma sensitivity and detection efficiency were investigated in the simulation. It was concluded that a 0.5-mm-thick lithium-glass scintillator with natural lithium is an appropriate choice to satisfy both the neutron detection efficiency and gamma elimination requirements.