Abstract
Previous studies showed that CsI(Na) crystals have significantly different waveforms between $$\alpha $$ and $$\gamma $$ scintillations. 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. 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. The different responses of CsI(Na) to $$\gamma $$ and $$\alpha $$ at different temperatures are explained with self-trapped and activator luminescence centers. 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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