Abstract
Introduction
Previous studies showed that CsI(Na) crystals have significantly different waveforms between \(\alpha \) and \(\gamma \) scintillations.
Experimental
In this work, the light yield and pulse shape discrimination capability of CsI(Na) scintillators as a function of the temperature down to 80 K have been studied.
Results
As temperature drops, the fast component increases and the slow component decreases. By cooling the CsI(Na) crystals, the light yield of high-ionization events is enhanced significantly, while the light yield of background \(\gamma \) events is suppressed. At 110 K, CsI(Na) crystal achieves the optimal balance between low threshold and good background rejection performance.
Discussion
The different responses of CsI(Na) to \(\gamma \) and \(\alpha \) at different temperatures are explained with self-trapped and activator luminescence centers.
Conclusions
PSD capability of CsI(Na) reaches the peak at 110 K, which can be the optimum operating temperature for future CsI(Na)-based dark matter detector.
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Zhang, X., Sun, X., Lu, J. et al. The low temperature performance of CsI(Na) crystals for WIMPs direct searches. Radiat Detect Technol Methods 2, 15 (2018). https://doi.org/10.1007/s41605-018-0039-1
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DOI: https://doi.org/10.1007/s41605-018-0039-1