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A novel method to improve the spatial resolution of GEM neutron detectors with a stopping layer

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posted on 26.08.2021, 19:53 authored by Tao YangTao Yang, Jianrong Zhou, Xiaojuan Zhou, Lin Zhu, Hangyu Zhu, Jianjin Zhou, Yuanguang Xia, Yangdong Wei, Xingfen Jiang, Wenqin Yang, Gui'an Yang, Songlin Wang, Yuguang Xie, Zhijia Sun, Qun Ouyang, Jingtao Zhu, Yuanbo Chen
This paper proposes a novel method to improve the spatial resolution of ceramic GEM detectors by adding a stopping layer on top of the solid 10B4C neutron converter. This will restrict the emission of the secondary ion products of large angles and consequently improve the spatial resolution. The Monte Carlo program FLUKA is used to validate the method, and the verification experiments are carried out at the beam line #20 (BL20) of the China Spallation Neutron Source (CSNS). The experimental results are approximately in agreement with the simulations. The measured spatial resolution is 1.61 mm for the GEM neutron detector operated at ambient pressure with a 1-μm-thick 10B4C converter, and it is improved to ~0.8 mm by coating a 3-μm-thick titanium on top of the 10B4C converter.


This work was supported by the National Key R&D Program of China (Grant No. 2017YFA0403702), the National Natural Science Foundation of China (Grant Nos. U1832119, 11635012 and 11775243), Youth Innovation Promotion Association CAS, China, and Guangdong Basic and Applied Basic Research Foundation, China (Grant No. 2019A1515110217).


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Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing 100049, China; Spallation Neutron Source Science Center, Dongguan 523803, China; and University of Chinese Academy of Sciences, Beijing 100049, China.

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in IEEE Transactions on Nuclear Science