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3. The first result on 76Ge neutrinoless double beta decay from CDEX-1 experiment

Author

Wang, Li, Yue, Qian, Kang, KeJun, Cheng, JianPing, Li, YuanJing, Wong, TszKing Henry, Lin, ShinTed, Chang, JianPing, Chen, JingHan, Chen, QingHao, Chen, YunHua, Deng, Zhi, Du, Qiang, Gong, Hui, He, Li, He, QingJu, Hu, JinWei, Huang, HanXiong, Huang, TengRui, Jia, LiPing, Jiang, Hao, Li, HauBin, Li, Hong, Li, JianMin, Li, Jin, Li, Jun, Li, Xia, Li, XinYing, Li, XueQian, Li, YuLan, Lin, FongKay, Liu, ShuKui, Ma, Hao, Ma, JingLu, Pan, XingYu, Ren, Jie, Ruan, XiChao, Shen, ManBin, Sharma, Vivek, Singh, Lakhwinder, Singh, Manoj Kumar, Soma, Arun Kumar, Su, Jian, Tang, ChangJian, Tang, WeiYou, Tseng, ChaoHsiung, Wang, JiMin, Wang, Qing, Wu, ShiYong, Wu, Wei, Wu, YuCheng, Xing, HaoYang, Xu, Yin, Xue, Tao, Yang, LiTao, Yang, SongWei, Yi, Nan, Yu, ChunXu, Yu, HaiJun, Zeng, WeiHe, Zeng, XiongHui, Zeng, Zhi, Zhang, Lan, Zhang, YunHua, Zhao, MingGang, Zhao, Wei, Zhong, SuNing, Zhou, JiFang, Zhou, ZuYing, Zhu, JingJun, Zhu, WeiBin, and Zhu, ZhongHua

Subjects
High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
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., Comment: 8 pages, 8 figures

Published
2017
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4. The Interfacial Defects Characteristic and Low-Temperature Electrical Properties of the Germanium Oxynitride Passivation Film for Ge- Based Mos Device and High Purity Germanium Detectors

Author

Du, Shengjie, primary, Li, Xiuxia, additional, Qiu, Menglin, additional, Zhu, Yaohui, additional, Tang, Weiyou, additional, Deng, Zhi, additional, Tian, Yang, additional, Li, Yulan, additional, Jia, Ke, additional, Li, Zhengcao, additional, Cheng, Jianping, additional, and Lv, Shasha, additional

Published
2024
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7. First results on 76Ge neutrinoless double beta decay from CDEX-1 experiment

Author

Wang, Li, Yue, Qian, Kang, KeJun, Cheng, JianPing, Li, YuanJing, Wong, TszKing Henry, Lin, ShinTed, Chang, JianPing, Chen, JingHan, Chen, QingHao, Chen, YunHua, Deng, Zhi, Du, Qiang, Gong, Hui, He, Li, He, QingJu, Hu, JinWei, Huang, HanXiong, Huang, TengRui, Jia, LiPing, Jiang, Hao, Li, HauBin, Li, Hong, Li, JianMin, Li, Jin, Li, Jun, Li, Xia, Li, XueQian, Li, YuLan, Lin, FongKay, Liu, ShuKui, Ma, Hao, Ma, JingLu, Pan, XingYu, Ren, Jie, Ruan, XiChao, Shen, ManBin, Sharma, Vivek, Singh, Lakhwinder, Singh, Manoj Kumar, Singh, Manoj Kumar, Soma, Arun Kumar, Tang, ChangJian, Tang, WeiYou, Tseng, ChaoHsiung, Wang, JiMin, Wang, Qing, Wu, ShiYong, Wu, YuCheng, Xing, HaoYang, Xu, Yin, Xue, Tao, Yang, LiTao, Yang, SongWei, Yi, Nan, Yu, ChunXu, Yu, HaiJun, Zeng, WeiHe, Zeng, XiongHui, Zeng, Zhi, Zhang, Lan, Zhang, YunHua, Zhao, MingGang, Zhao, Wei, Zhou, JiFang, Zhou, ZuYing, Zhu, JingJun, Zhu, WeiBin, Zhu, ZhongHua, and CDEX Collaboration

Published
2017
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8. Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search

Author

Jiang, Hao, Yang, LiTao, Yue, Qian, Kang, KeJun, Cheng, JianPing, Li, YuanJing, Wong, Henry Tsz-King, Ağartioğlu, M., An, HaiPeng, Chang, JianPing, Chen, JingHan, Chen, YunHua, Deng, Zhi, Du, Qiang, Gong, Hui, He, Li, Hu, JinWei, Hu, QingDong, Huang, HanXiong, Jia, LiPing, Li, HauBin, Li, Hong, Li, JianMin, Li, Jin, Li, Xia, Li, XueQian, Li, YuLan, Liao, Bin, Lin, FongKay, Lin, ShinTed, Liu, ShuKui, Liu, YanDong, Liu, YuanYuan, Liu, ZhongZhi, Ma, Hao, Ma, JingLu, Pan, Hui, Ren, Jie, Ruan, XiChao, Sevda, B., Sharma, Vivek, Shen, ManBin, Singh, Lakhwinder, Singh, Monoj Kumar, Sun, TianXi, Tang, ChangJian, Tang, WeiYou, Tian, Yang, Wang, GuangFu, Wang, JiMin, Wang, Li, Wang, Qing, Wang, Yi, Wu, ShiYong, Wu, YuCheng, Xing, HaoYang, Xu, Yin, Xue, Tao, Yang, SongWei, Yi, Nan, Yu, ChunXu, Yu, HaiJun, Yue, JianFeng, Zeng, XiongHui, Zeng, Ming, Zeng, Zhi, Zhang, FengShou, Zhang, YunHua, Zhao, MingGang, Zhou, JiFang, Zhou, ZuYing, Zhu, JingJun, Zhu, ZhongHua, and CDEX Collaboration

Published
2018
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10. Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search

Author

Jiang, Hao, Yang, LiTao, Yue, Qian, Kang, KeJun, Cheng, JianPing, Li, YuanJing, Wong, Henry, Ağartioğlu, M., An, HaiPeng, Chang, JianPing, Chen, JingHan, Chen, YunHua, Deng, Zhi, Du, Qiang, Gong, Hui, He, Li, Hu, JinWei, Hu, QingDong, Huang, HanXiong, Jia, LiPing, Li, HauBin, Li, Hong, Li, JianMin, Li, Jin, Li, Xia, Li, XueQian, Li, YuLan, Liao, Bin, Lin, FongKay, Lin, ShinTed, Liu, ShuKui, Liu, YanDong, Liu, YuanYuan, Liu, ZhongZhi, Ma, Hao, Ma, JingLu, Pan, Hui, Ren, Jie, Ruan, XiChao, Sevda, B., Sharma, Vivek, Shen, ManBin, Singh, Lakhwinder, Singh, Monoj, Sun, TianXi, Tang, ChangJian, Tang, WeiYou, Tian, Yang, Wang, GuangFu, Wang, JiMin, Wang, Li, Wang, Qing, Wang, Yi, Wu, ShiYong, Wu, YuCheng, Xing, HaoYang, Xu, Yin, Xue, Tao, Yang, SongWei, Yi, Nan, Yu, ChunXu, Yu, HaiJun, Yue, JianFeng, Zeng, XiongHui, Zeng, Ming, Zeng, Zhi, Zhang, FengShou, Zhang, YunHua, Zhao, MingGang, Zhou, JiFang, Zhou, ZuYing, Zhu, JingJun, and Zhu, ZhongHua

Abstract

The CDEX-10 experiment searches for light weakly interacting massive particles, a form of dark matter, at the China Jinping Underground Laboratory, where approximately 10 kg of germanium detectors are arranged in an array and immersed in liquid nitrogen. Herein, we report on the experimental apparatus, detector characterization, and spectrum analysis of one prototype detector. Owing to the higher rise-time resolution of the CDEX-10 prototype detector as compared with CDEX-1B, we identified the origin of an observed category of extremely fast events. For data analysis of the CDEX-10 prototype detector, we introduced and applied an improved bulk/surface event discrimination method. The results of the new method were compared to those of the CDEX-1B spectrum. Both sets of results showed good consistency in the 0–12 keVee energy range, except for the 8.0 keV K-shell X-ray peak from the external copper.

Published
2019
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11. Study on cosmogenic activation in germanium detectors for future tonne-scale CDEX experiment

Author

Ma, JingLu, Yue, Qian, Lin, ShinTed, Wong, Henry, Hu, JinWei, Jia, LiPing, Jiang, Hao, Li, Jin, Liu, ShuKui, Liu, ZhongZhi, Ma, Hao, Tang, WeiYou, Tian, Yang, Wang, Li, Wang, Qing, Wang, Yi, Yang, LiTao, and Zeng, Zhi

Abstract

A study on cosmogenic activation in germanium was carried out to evaluate the cosmogenic background level of natural and 70Ge depleted germanium detectors. The production rates of long-lived radionuclides were calculated with Geant4 and CRY. Results were validated by comparing the simulated and experimental spectra of CDEX-1B detector. Based on the validated codes, the cosmogenic background level was predicted for further tonne-scale CDEX experiment. The suppression of cosmogenic background level could be achieved by underground germanium crystal growth and high-purity germanium detector fabrication to reach the sensitivity requirement for direct detection of dark matter. With the low cosmogenic background, new physics channels, such as solar neutrino research and neutrinoless double-beta decay experiments, were opened and the corresponding simulations and evaluations were carried out.

Published
2019
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12. First experimental constraints on WIMP couplings in the effective field theory framework from CDEX

Author

Wang, Yi, Zeng, Zhi, Yue, Qian, Yang, LiTao, Kang, KeJun, Li, YuanJing, Ağartioğlu, Mehment, An, HaiPeng, Chang, JianPing, Chen, JingHan, Chen, YunHua, Cheng, JianPing, Chiang, Cheng Yi, Dai, WenHan, Deng, Zhi, Fang, ChangHao, Geng, XinPing, Gong, Hui, Guo, QiuJu, Guo, XuYuan, He, HongJian, He, Li, He, ShengMing, Hu, JinWei, Huang, TuChen, Huang, HanXiong, Jia, HaiTao, Jia, LiPing, Jiang, Xi, Li, HauBin, Li, JianMin, Li, Jin, Li, MingXuan, Li, RenMingJie, Li, Xia, Li, YuLan, Liao, Bin, Lin, FongKay, Lin, ShinTed, Liu, ShuKui, Liu, YanDong, Liu, Yu, Liu, YuanYuan, Liu, ZhongZhi, Ma, Hao, Mao, YuCai, Nie, QiYuan, Ning, JinHua, Pan, Hui, Qi, NingChun, Ren, Jie, Ruan, XiChao, Shang, ChangSong, Sharma, Vivek, She, Ze, Singh, Lakhwinder, Singh, Monoj Kumar, Sun, TianXi, Tang, ChangJian, Tang, WeiYou, Tian, Yang, Wang, GuangFu, Wang, Li, Wang, Qing, Wang, YuChen, Wang, YunXiang, Wang, Zhen, Wong, Henry Tsz-King, Wu, ShiYong, Wu, YuCheng, Xing, HaoYang, Xu, Yin, Xue, Tao, Yan, YuLu, Yi, Nan, Yu, ChunXu, Yu, HaiJun, Yue, JianFeng, Zeng, Ming, Zhang, BingTao, Zhang, Lei, Zhang, FengShou, Zhang, ZhenYu, Zhao, KangKang, Zhao, MingGang, Zhou, JiFang, Zhou, ZuYing, and Zhu, JingJun

Abstract

We present weakly interacting massive particles (WIMPs) search results performed using two approaches of effective field theory from the China Dark Matter Experiment (CDEX), based on the data from both CDEX-1B and CDEX-10 stages. In the nonrelativistic effective field theory approach, both time-integrated and annual modulation analyses were used to set new limits for the coupling of WIMP-nucleon effective operators at 90% confidence level (C.L.) and improve over the current bounds in the low mχregion. In the chiral effective field theory approach, data from CDEX-10 were used to set an upper limit on WIMP-pion coupling at 90% C.L. We for the first time extended the limit to the mχ< 6 GeV/c2region.

Published
2021
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