CDEX-1 实验对 76Ge 无中微子双贝塔衰变的首个结果
高能物理 - 实验
2018-02-28 v1 核实验
仪器与探测器
摘要
我们报告了中国锦屏地下实验室 CDEX-1 实验对 Ge-76 无中微子双贝塔衰变的首个结果。已安装一台质量为 994 g 的 P 型点接触高纯锗探测器，用于搜寻无中微子双贝塔衰变事件以及直接探测暗物质粒子。分析了 304 kg·天的曝光量。获得了 500 keV 至 3 MeV 的宽带谱，在 2.039 MeV 能区的平均事件率约为 0.012 计数/(keV·kg·天)。基于此结果推导出 Ge-76 无中微子双贝塔衰变的半衰期为：T_{1/2} > 6.4×10^22 年（90% 置信水平）。得到了有效马约拉纳中微子质量上限为 5.0 eV。讨论了进一步降低本底水平的可能方法，并将在 CDEX 实验的下一阶段进行探索。
引用
@article{arxiv.1703.01877,
title = {The first result on 76Ge neutrinoless double beta decay from CDEX-1 experiment},
author = {Li Wang and Qian Yue and KeJun Kang and JianPing Cheng and YuanJing Li and TszKing Henry Wong and ShinTed Lin and JianPing Chang and JingHan Chen and QingHao Chen and YunHua Chen and Zhi Deng and Qiang Du and Hui Gong and Li He and QingJu He and JinWei Hu and HanXiong Huang and TengRui Huang and LiPing Jia and Hao Jiang and HauBin Li and Hong Li and JianMin Li and Jin Li and Jun Li and Xia Li and XinYing Li and XueQian Li and YuLan Li and FongKay Lin and ShuKui Liu and Hao Ma and JingLu Ma and XingYu Pan and Jie Ren and XiChao Ruan and ManBin Shen and Vivek Sharma and Lakhwinder Singh and Manoj Kumar Singh and Manoj Kumar Singh and Arun Kumar Soma and Jian Su and ChangJian Tang and WeiYou Tang and ChaoHsiung Tseng and JiMin Wang and Qing Wang and ShiYong Wu and Wei Wu and YuCheng Wu and HaoYang Xing and Yin Xu and Tao Xue and LiTao Yang and SongWei Yang and Nan Yi and ChunXu Yu and HaiJun Yu and WeiHe Zeng and XiongHui Zeng and Zhi Zeng and Lan Zhang and YunHua Zhang and MingGang Zhao and Wei Zhao and SuNing Zhong and JiFang Zhou and ZuYing Zhou and JingJun Zhu and WeiBin Zhu and ZhongHua Zhu},
journal= {arXiv preprint arXiv:1703.01877},
year = {2018}
}
备注
8 pages, 8 figures