The low temperature performance of CsI(Na)crystals for WIMPs direct searches  

作　　者：Xuan Zhang Xilei Sun Junguang Lu Pin Lv 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics,Institute of High Energy Physics,CAS,Beijing 100049,China

出　　处：《Radiation Detection Technology and Methods》2018年第1期99-104,共6页辐射探测技术与方法（英文）

摘　　要：Introduction Previous studies showed that CsI(Na)crystals have significantly different waveforms betweenαandγscintillations.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 backgroundγevents 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)toγandαat 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.

关 键 词：CsI(Na) Crystal Dark matter Nuclear recoil Particle discrimination Self-trapped exciton 

分 类 号：TN9[电子电信—信息与通信工程]