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Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search

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arxiv 1810.08808 v1 pith:GRWQBREQ submitted 2018-10-20 physics.ins-det hep-ex

H. Jiang , L. T. Yang , Q. Yue , K. J. Kang , J. P. Cheng , Y. J. Li , H. T. Wong , M. Agartioglu
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H. P. An J. P. Chang J. H. Chen Y. H. Chen Z. Deng Q. Du H. Gong L. He J. W. Hu Q. D. Hu H. X. Huang L. P. Jia H. B. Li H. Li J. M. Li J. Li X. Li X. Q. Li Y. L. Li B. Liao F. K. Lin S. T. Lin S. K. Liu Y. D. Liu Y. Y. Liu Z. Z. Liu H. Ma J. L. Ma H. Pan J. Ren X. C. Ruan B. Sevda V. Sharma M. B. Shen L. Singh M. K. Singh T. X. Sun C. J. Tang W. Y. Tang Y. Tian G. F. Wang J. M. Wang L. Wang Q. Wang Y. Wang S. Y. Wu Y. C. Wu H. Y. Xing Y. Xu T. Xue S. W. Yang N. Yi C. X. Yu H. J. Yu J. F. Yue X. H. Zeng M. Zeng Z. Zeng F. S. Zhang Y. H. Zhang M. G. Zhao J. F. Zhou Z. Y. Zhou J. J. Zhu Z. H. Zhu
This is my paper · ORCID
classification physics.ins-dethep-ex
keywords detectorprototypecdex-10analysiscdex-1bcompareddarkgermanium
verification ladder T0 review T1 audit T2 compute T3 formal
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The CDEX-10 experiment searches for light weakly-interacting massive particles, a form of dark matter, at the China JinPing underground laboratory, where approximately 10 kg of germanium detectors are arranged in an array and immersed in liquid nitrogen. Herein, we report on the experimental apparatus, detector characterization, and spectrum analysis of one prototype detector. Owing to the higher rise-time resolution of the CDEX-10 prototype detector as compared with CDEX-1B, we identified the origin of an observed category of extremely fast events. For data analysis of the CDEX-10 prototype, we introduced and applied an improved bulk/surface event discrimination method. The results of the new method were compared to those of the CDEX-1B spectrum. Both sets of results showed good consistency in the 0--12 keVee energy range, except for the 8.0 keV K-shell X-ray peak from the external copper.

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