Browsing by Author "Li Wang"

Now showing 1 - 10 of 10

CDEX-1 1 kg point-contact germanium detector for low mass dark matter searches
(2013) Ke-Jun Kang; Qian Yue; Yu-Cheng Wu; Jian-Ping Cheng; Yuan-Jing Li; Yang Bai; Yong Bi; Jian-Ping Chang; Nan Chen; Ning Chen; Qing-Hao Chen; Yun-Hua Chen; Yo-Chun Chuang; Zhi Deng; Qiang Du; Hui Gong; Xi-Qing Hao; Qing-Ju He; Xin-Hui Hu; Han-Xiong Huang; Teng-Rui Huang; Hao Jiang; Hau-Bin Li; Jian-Min Li; Jin Li; Jun Li; Xia Li; Xin-Ying Li; Xue-Qian Li; Yu-Lan Li; Heng-Yi Liao; Fong-Kay Lin; Shin-Ted Lin; Shu-Kui Liu; Lan-Chun Lü; Hao Ma; Shao-Ji Mao; Jian-Qiang Qin; Jie Ren; Jing Ren; Xi-Chao Ruan; Man-Bin Shen; Lakhwinder Singh; Manoj Kumar Singh; Arun Kumar Soma; Jian Su; Chang-Jian Tang; Chao-Hsiung Tseng; Ji-Min Wang; Li Wang; Qing Wang; Tsz-King Henry Wong; Shi-Yong Wu; Wei Wu; Hao-Yang Xing; Yin Xu; Tao Xue; Li-Tao Yang; Song-Wei Yang; Nan Yi; Chun-Xu Yu; Hao Yu; Xun-Zhen Yu; Xiong-Hui Zeng; Zhi Zeng; Lan Zhang; Yun-Hua Zhang; Ming-Gang Zhao; Wei Zhao; Su-Ning Zhong; Zu-Ying Zhou; Jing-Jun Zhu; Wei-Bin Zhu; Xue-Zhou Zhu; Zhong-Hua Zhu
The CDEX collaboration has been established for direct detection of light dark matter particles, using ultra-low energy threshold point-contact p-type germanium detectors, in China JinPing underground Laboratory (CJPL). The first 1 kg point-contact germanium detector with a sub-keV energy threshold has been tested in a passive shielding system located in CJPL. The outputs from both the point-contact P+ electrode and the outside N+ electrode make it possible to scan the lower energy range of less than 1 keV and at the same time to detect the higher energy range up to 3 MeV. The outputs from both P+ and N+ electrode may also provide a more powerful method for signal discrimination for dark matter experiment. Some key parameters, including energy resolution, dead time, decay times of internal X-rays, and system stability, have been tested and measured. The results show that the 1 kg point-contact germanium detector, together with its shielding system and electronics, can run smoothly with good performances. This detector system will be deployed for dark matter search experiments. © 2013 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Constraining dark matter models with a light mediator from the CDEX-10 experiment at China Jinping Underground Laboratory
(Institute of Physics, 2025) Qiyuan Nie; Wenhan Dai; Hao Ma; Qian Yue; Kejun Kang; Yuanjing Li; Haipeng An; C. Greeshma; Jianping Chang; Yunhua Chen; Jianping Cheng; Zhi Deng; Changhao Fang; Xinping Geng; Hui Gong; Tao Guo; Xuyuan Guo; Li He; Jinrong He; Hanxiong Huang; Tuchen Huang; S. Karmakar; Jianmin Li; Jin Li; Yulan Li; Haubin Li; Mingchuan Li; Hanyu Li; Qianyun Li; Renmingjie Ming Jie Li; Xueqian Li; Yifan Liang; Bin Liao; Fong Kay Lin; Shinted Lin; Jiaxuan Liu; Yandong Liu; Yuanyuan Liu; Shukui Liu; Yu Liu; Hui Pan; Ningchun Qi; Jie Ren; Xichao Ruan; Manbin Shen; Manoj Kumar Singh; Wenliang Sun; Tianxi Sun; Changjian Tang; Yang Tian; Hongfei Wan; Junzheng Wang; Yufeng Wang; Guangfu Wang; Li Wang; Qing Wang; Henry Tsz King Wong; Yucheng Wu; Haoyang Xing; Kaizhi Xiong; Rui Xu; Yin Xu; Tao Xue; Yulu Yan; Litao Yang; Nan Yi; Chunxu Yu; Haijun Yu; Xiao Yu; Ming Zeng; Zhi Zeng; Z. H. Zhang; Zhenyu Zhang; Peng Zhang; Fengshou Zhang; Lei Zhang; Jizhong Zhao; Kangkang Zhao; Minggang Zhao; Jifang Zhou; Zuying Zhou; Jingjun Zhu
We search for nuclear recoil signals of dark matter (DM) models with a light mediator using data taken from a p-type point-contact germanium detector of the CDEX-10 experiment at the China Jinping Underground Laboratory. The 90% confidence level upper limits on the DM-nucleon interaction cross section from 205.4 kg-day exposure data are derived, excluding the new parameter space in 2-3 GeV DM mass when the mediator mass is comparable to or lower than the typical momentum transfer. We further interpret our results to constrain a specific self-interacting DM model with a light mediator coupling to the photon through kinetic mixing and set experimental limits on the model parameter region favored by astrophysical observations. © 2025 Institute of Physics. All rights reserved.
First experimental constraints on WIMP couplings in the effective field theory framework from CDEX
(Science in China Press, 2021) Yi Wang; Zhi Zeng; Qian Yue; LiTao Yang; KeJun Kang; YuanJing Li; Mehment Ağartioğlu; HaiPeng An; JianPing Chang; JingHan Chen; YunHua Chen; JianPing Cheng; Cheng Yi Chiang; WenHan Dai; Zhi Deng; ChangHao Fang; XinPing Geng; Hui Gong; QiuJu Guo; XuYuan Guo; HongJian He; Li He; ShengMing He; JinWei Hu; TuChen Huang; HanXiong Huang; HaiTao Jia; LiPing Jia; Xi Jiang; HauBin Li; JianMin Li; Jin Li; MingXuan Li; RenMingJie Li; Xia Li; YuLan Li; Bin Liao; FongKay Lin; ShinTed Lin; ShuKui Liu; YanDong Liu; Yu Liu; YuanYuan Liu; ZhongZhi Liu; Hao Ma; YuCai Mao; QiYuan Nie; JinHua Ning; Hui Pan; NingChun Qi; Jie Ren; XiChao Ruan; ChangSong Shang; Vivek Sharma; Ze She; Lakhwinder Singh; Monoj Kumar Singh; TianXi Sun; ChangJian Tang; WeiYou Tang; Yang Tian; GuangFu Wang; Li Wang; Qing Wang; YuChen Wang; YunXiang Wang; Zhen Wang; Henry Tsz-King Wong; ShiYong Wu; YuCheng Wu; HaoYang Xing; Yin Xu; Tao Xue; YuLu Yan; Nan Yi; ChunXu Yu; HaiJun Yu; JianFeng Yue; Ming Zeng; BingTao Zhang; Lei Zhang; FengShou Zhang; ZhenYu Zhang; KangKang Zhao; MingGang Zhao; JiFang Zhou; ZuYing Zhou; JingJun Zhu
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/c2 region. © 2021, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
First results on 76Ge neutrinoless double beta decay from CDEX-1 experiment
(Science in China Press, 2017) Li Wang; Qian Yue; Ke.Jun. Kang; Jian.Ping. Cheng; Yuan.Jing. Li; Tsz.King.Henry. Wong; Shin.Ted. Lin; Jian.Ping. Chang; Jing.Han. Chen; Qing.Hao. Chen; Yun.Hua. Chen; Zhi Deng; Qiang Du; Hui Gong; Li He; Qing.Ju. He; Jin.Wei. Hu; Han.Xiong. Huang; Teng.Rui. Huang; Li.Ping. Jia; Hao Jiang; Hau.Bin. Li; Hong Li; Jian.Min. Li; Jin Li; Jun Li; Xia Li; Xue.Qian. Li; Yu.Lan. Li; Fong.Kay. Lin; Shu.Kui. Liu; Hao Ma; Jing.Lu. Ma; Xing.Yu. Pan; Jie Ren; Xi.Chao. Ruan; Man.Bin. Shen; Vivek Sharma; Lakhwinder Singh; Manoj.Kumar. Singh; Manoj.Kumar. Singh; Arun.Kumar. Soma; Chang.Jian. Tang; Wei.You. Tang; Chao.Hsiung. Tseng; Ji.Min. Wang; Qing Wang; Shi.Yong. Wu; Yu.Cheng. Wu; Hao.Yang. Xing; Yin Xu; Tao Xue; Li.Tao. Yang; Song.Wei. Yang; Nan Yi; Chun.Xu. Yu; Hai.Jun. Yu; Wei.He. Zeng; Xiong.Hui. Zeng; Zhi Zeng; Lan Zhang; Yun.Hua. Zhang; Ming.Gang. Zhao; Wei Zhao; Ji.Fang. Zhou; Zu.Ying. Zhou; Jing.Jun. Zhu; Wei.Bin. Zhu; Zhong.Hua. Zhu
We report the first results on 76Ge neutrinoless double beta decay from stage one of the China dark-matter experiment (CDEX). A p-type point-contact high-purity germanium detector with a mass of 994 g has been installed to detect neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg d has been analyzed over a wide spectral band from 500 keV to 3 MeV. The average event rate obtained was about 0.012 counts per keV per kg per day over the 2.039 MeV energy range. The half-life of 76Ge neutrinoless double beta decay derived based on this result is T1/2 0ν>6.4×1022 yr (90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved. © 2017, Science China Press and Springer-Verlag Berlin Heidelberg.
Introduction to the CDEX experiment
(2013) Ke-Jun Kang; Jian-Ping Cheng; Jin Li; Yuan-Jing Li; Qian Yue; Yang Bai; Yong Bi; Jian-Ping Chang; Nan Chen; Ning Chen; Qing-Hao Chen; Yun-Hua Chen; Yo-Chun Chuang; Zhi Deng; Qiang Du; Hui Gong; Xi-Qing Hao; Hong-Jian He; Qing-Ju He; Xin-Hui Hu; Han-Xiong Huang; Teng-Rui Huang; Hao Jiang; Hau-Bin Li; Jian-Min Li; Jun Li; Xia Li; Xin-Ying Li; Xue-Qian Li; Yu-Lan Li; Heng-Ye Liao; Fong-Kay Lin; Shin-Ted Lin; Shu-Kui Liu; Ya-Bin Liu; Lan-Chun Lü; Hao Ma; Shao-Ji Mao; Jian-Qiang Qin; Jie Ren; Jing Ren; Xi-Chao Ruan; Man-Bin Shen; Man-Bin Shen; Lakhwinder Simgh; Manoj Kumar Singh; Arun Kumar Soma; Jian Su; Chang-Jian Tang; Chao-Hsiung Tseng; Ji-Min Wang; Li Wang; Qing Wang; Tsz-King Henry Wong; Xu-Feng Wang; Shi-Yong Wu; Wei Wu; Yu-Cheng Wu; Zhong-Zhi Xianyu; Hao-Yang Xing; Xun-Jie Xu; Yin Xu; Tao Xue; Li-Tao Yang; Song-Wei Yang; Nan Yi; Chun-Xu Yu; Hao Yu; Xun-Zhen Yu; Xiong-Hui Zeng; Zhi Zeng; Lan Zhang; Yun-Hua Zhang; Ming-Gang Zhao; Wei Zhao; Su-Ning Zhong; Jin Zhou; Zu-Ying Zhou; Jing-Jun Zhu; Wei-Bin Zhu; Xue-Zhou Zhu; Zhong-Hua Zhu
It is believed that weakly interacting massive particles (WIMPs) are candidates for dark matter (DM) in our universe which come from outer space and might interact with the standard model (SM) matter of our detectors on the earth. Many collaborations in the world are carrying out various experiments to directly detect DM particles. China Jinping underground Laboratory (CJPL) is the deepest underground laboratory in the world and provides a very promising environment for DM search. China Dark matter EXperiment (CDEX) is going to directly detect the WIMP flux with high sensitivity in the low WIMP-mass region. Both CJPL and CDEX have achieved a remarkable progress in recent three years. CDEX employs a point-contact germanium (PCGe) semi-conductor detector whose energy threshold is less than 300 eV. In this report we present the measurement results of muon flux, monitoring of radioactivity and radon concentration carried out in CJPL, as well describing the structure and performance of the 1 kg-PCGe detector in CDEX-1 and 10 kg-PCGe detector array in CDEX-10 including the detectors, electronics, shielding and cooling systems. Finally we discuss the physics goals of CDEX-1, CDEX-10 and the future CDEX-1T experiments. © 2013 Higher Education Press and Springer-Verlag Berlin Heidelberg.
Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground Laboratory
(Institute of Physics Publishing, 2018) Cdex Collaboration; Li-Tao Yang; Hau-Bin Li; Qian Yue; Ke-Jun Kang; Jian-Ping Cheng; Yuan-Jing Li; Henry Tsz-King Wong; M. Aartiolu; Hai-Peng An; Jian-Ping Chang; Jing-Han Chen; Yun-Hua Chen; Zhi Deng; Qiang Du; Hui Gong; Li He; Jin-Wei Hu; Qing-Dong Hu; Han-Xiong Huang; Li-Ping Jia; Hao Jiang; Hong Li; Jian-Min Li; Jin Li; Xia Li; Xue-Qian Li; Yu-Lan Li; Fong-Kay Lin; Shin-Ted Lin; Shu-Kui Liu; Zhong-Zhi Liu; Hao Ma; Jing-Lu Ma; Hui Pan; Jie Ren; Xi-Chao Ruan; B. Sevda; Vivek Sharma; Man-Bin Shen; Lakhwinder Singh; Manoj Kumar Singh; Chang-Jian Tang; Wei-You Tang; Yang Tian; Ji-Min Wang; Li Wang; Qing Wang; Yi Wang; Shi-Yong Wu; Yu-Cheng Wu; Hao-Yang Xing; Yin Xu; Tao Xue; Song-Wei Yang; Nan Yi; Chun-Xu Yu; Hai-Jun Yu; Jian-Feng Yue; Xiong-Hui Zeng; Ming Zeng; Zhi Zeng; Yun-Hua Zhang; Ming-Gang Zhao; Wei Zhao; Ji-Fang Zhou; Zu-Ying Zhou; Jing-Jun Zhu; Zhong-Hua Zhu
We report results of a search for light weakly interacting massive particle (WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory (CJPL). Constraints on WIMP-nucleon spin-independent (SI) and spin-dependent (SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV. © 2018 Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Performances of a prototype point-contact germanium detector immersed in liquid nitrogen for light dark matter search
(Science in China Press, 2019) Hao Jiang; LiTao Yang; Qian Yue; KeJun Kang; JianPing Cheng; YuanJing Li; Henry Tsz-King Wong; M. Ağartioğlu; HaiPeng An; JianPing Chang; JingHan Chen; YunHua Chen; Zhi Deng; Qiang Du; Hui Gong; Li He; JinWei Hu; QingDong Hu; HanXiong Huang; LiPing Jia; HauBin Li; Hong Li; JianMin Li; Jin Li; Xia Li; XueQian Li; YuLan Li; Bin Liao; FongKay Lin; ShinTed Lin; ShuKui Liu; YanDong Liu; YuanYuan Liu; ZhongZhi Liu; Hao Ma; JingLu Ma; Hui Pan; Jie Ren; XiChao Ruan; B. Sevda; Vivek Sharma; ManBin Shen; Lakhwinder Singh; Monoj Kumar Singh; TianXi Sun; ChangJian Tang; WeiYou Tang; Yang Tian; GuangFu Wang; JiMin Wang; Li Wang; Qing Wang; Yi Wang; ShiYong Wu; YuCheng Wu; HaoYang Xing; Yin Xu; Tao Xue; SongWei Yang; Nan Yi; ChunXu Yu; HaiJun Yu; JianFeng Yue; XiongHui Zeng; Ming Zeng; Zhi Zeng; FengShou Zhang; YunHua Zhang; MingGang Zhao; JiFang Zhou; ZuYing Zhou; JingJun Zhu; ZhongHua Zhu
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. © 2018, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
Probing dark matter particles from evaporating primordial black holes via electron scattering in the CDEX-10 experiment
(Science China Press, 2024) Zhenhua Zhang; Litao Yang; Qian Yue; Kejun Kang; Yuanjing Li; Haipeng An; C. Greeshma; Jianping Chang; Yunhua Chen; Jianping Cheng; Wenhan Dai; Zhi Deng; Changhao Fang; Xinping Geng; Hui Gong; Qiuju Guo; Tao Guo; Xuyuan Guo; Li He; Shengming He; Jinwei Hu; Hanxiong Huang; Tuchen Huang; Lin Jiang; S. Karmakar; Haubin Li; Hanyu Li; Jianmin Li; Jin Li; Qianyun Li; Renmingjie Li; Xueqian Li; Yulan Li; Yifan Liang; Bin Liao; FongKay Lin; ShinTed Lin; Jiaxuan Liu; Shukui Liu; Yandong Liu; Yu Liu; Yuanyuan Liu; Hao Ma; Yucai Mao; Qiyuan Nie; Jinhua Ning; Hui Pan; Ningchun Qi; Jie Ren; Xichao Ruan; Monoj Kumar Singh; Tianxi Sun; Changjian Tang; Yang Tian; Guangfu Wang; Junzheng Wang; Li Wang; Qing Wang; Yufeng Wang; Yunxiang Wang; Henry Tsz-King Wong; Shiyong Wu; Yucheng Wu; Haoyang Xing; Rui Xu; Yin Xu; Tao Xue; Yulu Yan; Nan Yi; Chunxu Yu; Haijun Yu; Jianfeng Yue; Ming Zeng; Zhi Zeng; Bingtao Zhang; Fengshou Zhang; Lei Zhang; Zhenyu Zhang; Jizhong Zhao; Kangkang Zhao; Minggang Zhao; Jifang Zhou; Zuying Zhou; Jingjun Zhu
Dark matter (DM) is a major constituent of the Universe. However, no definite evidence of DM particles (denoted as “χ”) has been found in DM direct detection (DD) experiments to date. There is a novel concept of detecting χ from evaporating primordial black holes (PBHs). We search for χ emitted from PBHs by investigating their interaction with target electrons. The examined PBH masses range from 1 × 1015 to 7 × 1016 g under the current limits of PBH abundance fPBH. Using 205.4 kg·day data obtained from the CDEX-10 experiment conducted in the China Jinping Underground Laboratory, we exclude the χ-electron (χ-e) elastic-scattering cross section σχ ∼ 5 × 10−29 cm2 for χ with a mass mχ ≲ 0.1 keV from our results. With the higher radiation background but lower energy threshold (160 eV), CDEX-10 fills a part of the gap in the previous work. If (mχ,σχ) can be determined in the future, DD experiments are expected to impose strong constraints on fPBH for large MPBHs. © Science China Press 2024.
Searching for 76Ge neutrinoless double beta decay with the CDEX-1B experiment
(Institute of Physics, 2024) Bing-Tao Zhang; Jun-Zheng Wang; Li-Tao Yang; Qian Yue; Ke-Jun Kang; Yuan-Jing Li; Hai-Peng An; C. Greeshma; Jian-Ping Chang; Yun-Huan Chen; Jian-Ping Cheng; Wen-Han Dai; Zhi Deng; Chang-Hao Fang; Xin-Ping Geng; Hui Gong; Qiu-Ju Guo; Xu-Yuan Guo; Li He; Sheng-Ming He; Jin-Wei Hu; Han-Xiong Huang; Tu-Chen Huang; Hai-Tao Jia; Xi Jiang; S. Karmakar; Hao-Bin Li; Jian-Min Li; Jin Li; Qian-Yun Li; Ren-Ming-Jie Li; Xue-Qian Li; Yu-Lan Li; Yi-Fan Liang; Bin Liao; Fong-Kay Lin; Shin-Ted Lin; Jia-Xuan Liu; Shu-Kui Liu; Yan-Dong Liu; Yu Liu; Yuan-Yuan Liu; Zhong-Zhi Liu; Hao Ma; Yu-Cai Mao; Qi-Yuan Nie; Jin-Hua Ning; Hui Pan; Ning-Chun Qi; Jie Ren; Xi-Chao Ruan; Ze She; Manoj Kumar Singh; Tian-Xi Sun; Chang-Jian Tang; Wei-You Tang; Yang Tian; Guang-Fu Wang; Li Wang; Qing Wang; Yu-Feng Wang; Yun-Xiang Wang; Henry-Tsz-King Wong; Shi-Yong Wu; Yu-Cheng Wu; Hao-Yang Xing; Rui Xu; Yin Xu; Tao Xue; Yu-Lu Yan; Nan Yi; Chun-Xu Yu; Hai-Jun Yu; Jian-Feng Yue; Ming Zeng; Zhi Zeng; Feng-Shou Zhang; Lei Zhang; Zhen-Hua Zhang; Zhen-Yu Zhang; Kang-Kang Zhao; Ming-Gang Zhao; Ji-Fang Zhou; Zu-Ying Zhou; Jing-Jun Zhou
We operated a p-type point contact high purity germanium (PPCGe) detector (CDEX-1B, 1.008 kg) in the China Jinping Underground Laboratory (CJPL) for 500.3 days to search for neutrinoless double beta ( ) decay of 76Ge. A total of 504.3 kg day effective exposure data was accumulated. The anti-coincidence and the multi/single-site event (MSE/SSE) discrimination methods were used to suppress the background in the energy region of interest (ROI, 1989-2089 keV for this work) with a factor of 23. A background level of 0.33 counts/ (keV kg yr) was realized. The lower limit on the half life of 76Ge decay was constrained as , corresponding to the upper limits on the effective Majorana neutrino mass: 3.2-7.5 . © 2024 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.
Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment
(Institute of Physics Publishing, 2015) Jian Su; Zhi Zeng; Hao Ma; Qian Yue; Jian-Ping Cheng; Jian-Ping Chang; Nan Chen; Ning Chen; Qing-Hao Chen; Yun-Hua Chen; Yo-Chun Chuang; Zhi Deng; Qiang Du; Hui Gong; Xi-Qing Hao; Qing-Ju He; Han-Xiong Huang; Teng-Rui Huang; Hao Jiang; Ke-Jun Kang; Hau-Bin Li; Jian-Min Li; Jin Li; Jun Li; Xia Li; Xin-Ying Li; Xue-Qian Li; Yu-Lan Li; Yuan-Jing Li; Heng-Yi Liao; Fong-Kay Lin; Shin-Ted Lin; Shu-Kui Liu; Lan-Chun Lü; Shao-Ji Mao; Jian-Qiang Qin; Jie Ren; Jing Ren; Xi-Chao Ruan; Man-Bin Shen; Lakhwinder Singh; Manoj Kumar Singh; Arun Kumar Soma; Chang-Jian Tang; Chao-Hsiung Tseng; Ji-Min Wang; Li Wang; Qing Wang; Tsz-King Henry Wong; Shi-Yong Wu; Yu-Cheng Wu; Hao-Yang Xing; Yin Xu; Tao Xue; Li-Tao Yang; Song-Wei Yang; Nan Yi; Chun-Xu Yu; Hao Yu; Xun-Zhen Yu; Xiong-Hui Zeng; Lan Zhang; Yun-Hua Zhang; Ming-Gang Zhao; Wei Zhao; Zu-Ying Zhou; Jing-Jun Zhu; Wei-Bin Zhu; Xue-Zhou Zhu; Zhong-Hua Zhu
The China Dark Matter Experiment (CDEX) is located at the China Jinping Underground Laboratory (CJPL) and aims to directly detect the weakly interacting massive particles (WIMP) flux with high sensitivity in the low mass region. Here we present a study of the predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within the GEANT4 program. Then the photon and electron background level in the energy region of interest (<10-2events•kg1•day-1•keV-1 (cpkkd)) is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of the CDEX-10 experiment, 0.1cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible. © 2015 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.