Characterization and optimization of a cryogenic pure CsI detector with remarkable light yield and unprecedented energy resolution for CLOVERS experiment  

作　　者：Chen-Guang Su Qian Liu Ling-Quan Kong Shi Chen Kimiya Moharrami Yang-Heng Zheng Jin Li 

机构地区：[1]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Nuclear Science and Techniques》2025年第5期79-87,共9页核技术(英文)

基　　金：supported by the National Key R&D Program of China(No.2022YFA1602204);the National Natural Science Foundation of China(Nos.12175241,12221005);the Fundamental Research Funds for the Central Universities;the International Partnership Program of the Chinese Academy of Sciences(No.211134KYSB20200057);the Double First-Class University Project Foundation of USTC。

摘　　要：In this study,we comprehensively characterized and optimized a cryogenic pure CsI(pCsI)detector.We utilized a 2 cm×2 cm×2 cm cube crystal coupled with a HAMAMATSU R11065 photomultiplier tube,achieving a remarkable light yield of 35.2 PE/ke V_(ee)and an unprecedented energy resolution of 6.9%at 59.54 ke V.Additionally,we measured the scintillation decay time of pCsI,which was significantly shorter than that of CsI(Na)at room temperature.Furthermore,we investigated the impact of temperature,surface treatment and crystal shape on light yield.Notably,the light yield peaked at approximately 20 K and remained stable within the range of 70–100 K.The light yield of the polished crystals was approximately 1.5 times greater than that of the ground crystals,whereas the crystal shape exhibited minimal influence on the light yield.These results are crucial for the design of the 10 kg pCsI detector for the future CLOVERS(coherent elastic neutrino(V)-nucleus scattering at China Spallation Neutron Source(CSNS))experiment.

关 键 词：Cryogenic CsI detector Light yield Energy resolution Scintillation decay time Light yield optimization CLOVERS CEνNS 

分 类 号：O571.5[理学—粒子物理与原子核物理]