Neutron-gamma discrimination of CsI(Na) crystals for dark matter searches
Sun, Xilei · Lu, Junguang · Hu, Tao · Zhou, Li · Cao, Jun · Wang, Yifang · Zhan, Liang · Yu, Boxiang · Cai, Xiao · Fang, Jian · Xie, Yuguang · An, Zhenghua · Wang, Zhigang · Xue, Zhen · Lu, Qiwen · Ning, Feipeng · Ge, Yongshuai · Liu, Yingbiao
Original · EN
The luminescent properties of CsI(Na) crystals are studied in this report. By using a TDS3054C oscilloscope with a sampling frequency of 5 GS/s, we find out that nuclear recoil signals are dominated by very fast light pulse with a decay time of 20 ns, while γ-ray signals have a decay time of 600 ns. The wavelength of nuclear recoil and γ-ray signals are also different. The study of n/γ separation shows that the rejection factor can reach an order of 10-7 with signal efficiency more than 80% at an equivalent electron recoil energy of 20 keV or more. Such a property makes CsI(Na) an ideal candidate for dark matter searches.
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