Physics – Instrumentation and Detectors
Scientific paper
2011-02-14
Nucl.Instrum.Meth.A642:52-58,2011
Physics
Instrumentation and Detectors
11 pages, 15 figures
Scientific paper
10.1016/j.nima.2011.03.062
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 {\gamma}-ray signals have a decay time of ~600 ns. The wavelength of nuclear recoil and {\gamma}-ray signals are also different. The study of n/{\gamma} 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.
An Zhenghua
Cai Xiao
Cao Jun
Fang Jian
Ge Yongshuai
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