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arXiv · 2509.17528

Performance of a Large-Volume Cryogenic Pure CsI Detector for CE{\nu}NS and Low-Energy Rare-Event Searches

Chen'guang Su·Lingquan Kong·Qian Liu·Shi Chen·Wenqian Huang·Kimiya Moharrami·Yangheng Zheng·Jin Li
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Abstract

A cryogenic detector system based on two 3.3 kg high-purity CsI crystals was developed and characterized at approximately 95 K. Each wedge-shaped crystal was coupled to dual-ended 3-inch photomultiplier tubes (PMTs) for scintillation readout. The measured light yields were $28.7 \pm 0.9$ and $29.3 \pm 1.0$ photoelectrons per keV electron-equivalent (PE/keV$_{ee}$) for the two crystals, with corresponding energy resolutions of 7.2 \% and 7.7 \% (FWHM) at 59.6 keV. The detector demonstrated excellent spatial uniformity, low intrinsic radioactivity, and stable operation over a continuous one-month period. Optical photon simulations using Geant4 reproduced the observed light collection trends, providing guidance for detector optimization. These results establish cryogenic pure CsI as a scalable technology for low-threshold rare-event searches.

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Chen'guang Su, Lingquan Kong, Qian Liu, Shi Chen, Wenqian Huang, Kimiya Moharrami, Yangheng Zheng, Jin Li. 2025-09-22. Performance of a Large-Volume Cryogenic Pure CsI Detector for CE{\nu}NS and Low-Energy Rare-Event Searches. https://arxiv.org/abs/2509.17528

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