The first result on 76Ge neutrinoless double beta decay from CDEX-1 experiment
Abstract
We report the first result on Ge-76 neutrinoless double beta decay from CDEX-1 experiment at China Jinping Underground Laboratory. A mass of 994 g p-type point-contact high purity germanium detector has been installed to search the neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg*day has been analyzed. The wideband spectrum from 500 keV to 3 MeV was obtained and the average event rate at the 2.039 MeV energy range is about 0.012 count per keV per kg per day. The half-life of Ge-76 neutrinoless double beta decay has been derived based on this result as: T 1/2 > 6.4*10^22 yr (90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved. The possible methods to further decrease the background level have been discussed and will be pursued in the next stage of CDEX experiment.
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Cite
@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}
}
Comments
8 pages, 8 figures