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Search for neutrinoless double-beta decay of Ge76 with a natural broad energy germanium detector

Physical review. D/Physical review. D.2022Vol. 106(3)

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W. H. Dai, H. Ma, Q. Yue, Z. She, K. Kang, Y. J. Li, M. Agartioglu, Haipeng An, J. P. Chang, Y. H. Chen, J. P. Cheng, Z. Deng, C. H. Fang, X. P. Geng, H. Gong, Q. Guo, Xiangbo Guo, Long He, S. M. He, J. W. Hu, H. X. Huang, T. Huang, H. T. Jia, Xi Jiang, H. B. Li, J. M. Li, Jingjing Li, Q. Y. Li, R. M. J. Li, X. Q. Li, Y. L. Li, Y. F. Liang, Bin Liao, F. K. Lin, S. T. Lin, S. K. Liu, Y. D. Liu, Yuting Liu, Y. Y. Liu, Z. Z. Liu, Y. C. Mao, Q. Y. Nie, J. H. Ning, H. Pan, Ningchun Qi, Jie Ren, X. C. Ruan, Kapil Saraswat, V. Sharma, M. K. Singh, Tao Sun, C. J. Tang, W. Y. Tang, Y. Tian, G. F. Wang, Lingling Wang, Qing Wang, Yan Wang, Yanru Wang, H. T. Wong, S. Y. Wu, Y. C. Wu, H. Xing, R. Xu, Y. Xu, Tianrui Xue, Y. L. Yan, L. T. Yang, Chih-Hsiang Yeh, N. Yi, C. X. Yu, Hao Yu, J. F. Yue, Ming Zeng, Zhao-Ming Zeng, B. T. Zhang, F. S. Zhang, L. Zhang, Z. H. Zhang, Z. Y. Zhang, K. K. Zhao, M. G. Zhao, Jingchen Zhou, Z. Zhou, J. J. Zhu

Abstract

A natural broad energy germanium detector is operated in the China Jinping Underground Laboratory for a feasibility study of building the next generation experiment of the neutrinoless double-beta ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay of $^{76}\mathrm{Ge}$. The setup of the prototype facility, characteristics of the broad energy germanium detector, background reduction methods, and data analysis are described in this paper. A background index of $6.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }\mathrm{counts}/(\mathrm{keV}\text{ }\mathrm{kg}\text{ }\mathrm{day})$ 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 day, thus a limit on the half life of $^{76}\mathrm{Ge}$ $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ decay is set at ${\mathrm{T}}_{1/2}^{0\ensuremath{\nu}}>5.62\ifmmode\times\else\texttimes\fi{}{10}^{22}\text{ }\text{ }\mathrm{yr}$ at 90% C.L. The limit corresponds to an effective Majorana neutrino mass in the range of 4.6--10.3 eV, dependent on the nuclear matrix elements.

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Abstract

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