Browsing by Author "Hao Jiang"

Now showing 1 - 6 of 6

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.
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.
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.