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Nuclear Experiment

arXiv:2205.10718 (nucl-ex)
[Submitted on 22 May 2022 (v1), last revised 5 Aug 2022 (this version, v2)]

Title:Search for Neutrinoless Double-Beta Decay of $^{76}$Ge with a Natural Broad Energy Germanium Detector

Authors:CDEX collaboration: W. H. Dai, H. Ma, Q. Yue, Z. She, K. J. Kang, Y. J. Li, M. Agartioglu, H. P. An, J. P. Chang, Y. H. Chen, J. P. Cheng, Z. Deng, C. H. Fang, X. P. Geng, H. Gong, Q. J. Guo, X. Y. Guo, L. He, S. M. He, J. W. Hu, H. X. Huang, T. C. Huang, H. T. Jia, X. Jiang, H. B. Li, J. M. Li, J. Li, Q. Y. Li, R. M. J. Li, X. Q. Li, Y. L. Li, Y. F. Liang, B. Liao, F. K. Lin, S. T. Lin, S. K. Liu, Y. D. Liu, Y. Liu, Y. Y. Liu, Z. Z. Liu, Y. C. Mao, Q. Y. Nie, J. H. Ning, H. Pan, N. C. Qi, J. Ren, X. C. Ruan, K. Saraswat, V. Sharma, M. K. Singh, T. X. Sun, C. J. Tang, W. Y. Tang, Y. Tian, G. F. Wang, L. Wang, Q. Wang, Y. Wang, Y. X. Wang, H. T. Wong, S. Y. Wu, Y. C. Wu, H. Y. Xing, R. Xu, Y. Xu, T. Xue, Y. L. Yan, L. T. Yang, C. H. Yeh, N. Yi, C. X. Yu, H. J. Yu, J. F. Yue, M. Zeng, Z. Zeng, B. T. Zhang, F. S. Zhang, L. Zhang, Z. H. Zhang, Z. Y. Zhang, K. K. Zhao, M. G. Zhao, J. F. Zhou, Z. Y. Zhou, J. J. Zhu
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Abstract:A natural broad energy germanium (BEGe) detector is operated in the China Jinping Underground Laboratory (CJPL) for a feasibility study of building the next generation experiment of the neutrinoless double-beta (0{$\nu\beta\beta$}) decay of $^{76}$Ge. The setup of the prototype facility, characteristics of the BEGe detector, background reduction methods, and data analysis are described in this paper. A background index of 6.4$\times$10$^{-3}$ counts/(keV$\cdot$kg$\cdot$day) is achieved and 1.86 times lower than our previous result of the CDEX-1 detector. No signal is observed with an exposure of 186.4 kg$\cdot$day, thus a limit on the half life of $^{76}$Ge 0$\nu\beta\beta$ decay is set at T$_{1/2}^{0\nu}$ $>$ 5.62$\times$10$^{22}$ yr at 90% C.L.. The limit corresponds to an effective Majorana neutrino mass in the range of 4.6 $\sim$ 10.3 eV, dependent on the nuclear matrix elements.
Comments: 10 pages, 15 figures
Subjects: Nuclear Experiment (nucl-ex); High Energy Physics - Experiment (hep-ex); Instrumentation and Detectors (physics.ins-det)
Cite as: arXiv:2205.10718 [nucl-ex]
  (or arXiv:2205.10718v2 [nucl-ex] for this version)
  https://doi.org/10.48550/arXiv.2205.10718
Journal reference: Physical Review D 106, 032012 (2022)
Related DOI: https://doi.org/10.1103/PhysRevD.106.032012

Submission history

From: Wenhan Dai [view email]
[v1] Sun, 22 May 2022 02:59:02 UTC (5,203 KB)
[v2] Fri, 5 Aug 2022 11:24:20 UTC (6,287 KB)
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