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Search for Neutrinoless Double-Beta Decay of ⁷⁶Ge with a Natural Broad Energy Germanium Detector

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arxiv 2205.10718 v2 pith:JQALYTXL submitted 2022-05-22 nucl-ex hep-exphysics.ins-det

Search for Neutrinoless Double-Beta Decay of ⁷⁶Ge with a Natural Broad Energy Germanium Detector

CDEX collaboration: W. H. Dai , H. Ma , Q. Yue , Z. She , K. J. Kang , Y. J. Li , M. Agartioglu , H. P. An
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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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classification nucl-ex hep-exphysics.ins-det
keywords betadetectorcdotdecaytimesbackgroundbegebroad
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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