Performance of a Large-Volume Cryogenic Pure CsI Detector for CEνNS and Low-Energy Rare-Event Searches
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arXiv
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| Format: | Preprint |
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2025
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| author | Su, Chen'guang Kong, Lingquan Liu, Qian Chen, Shi Huang, Wenqian Moharrami, Kimiya Zheng, Yangheng Li, Jin |
| author_facet | Su, Chen'guang Kong, Lingquan Liu, Qian Chen, Shi Huang, Wenqian Moharrami, Kimiya Zheng, Yangheng Li, Jin |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_17528 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Performance of a Large-Volume Cryogenic Pure CsI Detector for CEνNS and Low-Energy Rare-Event Searches Su, Chen'guang Kong, Lingquan Liu, Qian Chen, Shi Huang, Wenqian Moharrami, Kimiya Zheng, Yangheng Li, Jin Instrumentation and Detectors High Energy Physics - Experiment 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. |
| title | Performance of a Large-Volume Cryogenic Pure CsI Detector for CEνNS and Low-Energy Rare-Event Searches |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2509.17528 |