搜索$^{76} $ ge的中微子双β衰减，带有天然的宽能锗探测器

论文标题

搜索$^{76} $ ge的中微子双β衰减，带有天然的宽能锗探测器

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

论文作者

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.

论文摘要

自然的宽能晶（BEGE）探测器在中国的地下实验室（CJPL）中进行操作，以进行可行性研究，以建立$^{76} $ ge的Neutmoless double-beta（0 {$νββ$}）衰减的下一代实验。本文描述了原型设施的设置，BEGE探测器的特征，背景减少方法和数据分析。 6.4 $ \ times $ 10 $^{ - 3} $ COUNTS/（KEV $ \ CDOT $ kg $ \ cdot $ Day）的背景索引比我们先前的CDEX-1检测器的结果低1.86倍。未观察到没有信号，暴露于186.4 kg $ \ cdot $ day，因此限制了$^{76} $ ge 0 $ ge 0 $ n $ n $νββ$衰减的限制为t $ _ {1/2}^{0ν} {0ν} $> $> $> $> $> $ 5.62 $ 5.62 $ \ times $ 10 $ 10 $^22 $^{22} $ yr Intim a in ..取决于核矩阵元素的4.6 $ \ sim $ 10.3 ev。

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{$νββ$}) 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$νββ$ decay is set at T$_{1/2}^{0ν}$ $>$ 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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