학술논문
Search for Neutrinoless Double-Beta Decay of $^{76}$Ge with a Natural Broad Energy Germanium Detector
Document Type
Working Paper
Author
CDEX collaboration; Dai, W. H.; Ma, H.; Yue, Q.; She, Z.; Kang, K. J.; Li, Y. J.; Agartioglu, M.; An, H. P.; Chang, J. P.; Chen, Y. H.; Cheng, J. P.; Deng, Z.; Fang, C. H.; Geng, X. P.; Gong, H.; Guo, Q. J.; Guo, X. Y.; He, L.; He, S. M.; Hu, J. W.; Huang, H. X.; Huang, T. C.; Jia, H. T.; Jiang, X.; Li, H. B.; Li, J. M.; Li, J.; Li, Q. Y.; Li, R. M. J.; Li, X. Q.; Li, Y. L.; Liang, Y. F.; Liao, B.; Lin, F. K.; Lin, S. T.; Liu, S. K.; Liu, Y. D.; Liu, Y.; Liu, Y. Y.; Liu, Z. Z.; Mao, Y. C.; Nie, Q. Y.; Ning, J. H.; Pan, H.; Qi, N. C.; Ren, J.; Ruan, X. C.; Saraswat, K.; Sharma, V.; Singh, M. K.; Sun, T. X.; Tang, C. J.; Tang, W. Y.; Tian, Y.; Wang, G. F.; Wang, L.; Wang, Q.; Wang, Y.; Wang, Y. X.; Wong, H. T.; Wu, S. Y.; Wu, Y. C.; Xing, H. Y.; Xu, R.; Xu, Y.; Xue, T.; Yan, Y. L.; Yang, L. T.; Yeh, C. H.; Yi, N.; Yu, C. X.; Yu, H. J.; Yue, J. F.; Zeng, M.; Zeng, Z.; Zhang, B. T.; Zhang, F. S.; Zhang, L.; Zhang, Z. H.; Zhang, Z. Y.; Zhao, K. K.; Zhao, M. G.; Zhou, J. F.; Zhou, Z. Y.; Zhu, J. J.
Source
Physical Review D 106, 032012 (2022)
Subject
Language
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.
Comment: 10 pages, 15 figures
Comment: 10 pages, 15 figures