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Cao Z, Aharonian FA, An Q, Axikegu, Bai LX, Bai YX, Bao YW, Bastieri D, Bi XJ, Bi YJ, Cai H, Cai JT, Cao Z, Chang J, Chang JF, Chang XC, Chen BM, Chen J, Chen L, Chen L, Chen L, Chen MJ, Chen ML, Chen QH, Chen SH, Chen SZ, Chen TL, Chen XL, Chen Y, Cheng N, Cheng YD, Cui SW, Cui XH, Cui YD, Dai BZ, Dai HL, Dai ZG, Danzengluobu, Della Volpe D, D Ettorre Piazzoli B, Dong XJ, Fan JH, Fan YZ, Fan ZX, Fang J, Fang K, Feng CF, Feng L, Feng SH, Feng YL, Gao B, Gao CD, Gao Q, Gao W, Ge MM, Geng LS, Gong GH, Gou QB, Gu MH, Guo JG, Guo XL, Guo YQ, Guo YY, Han YA, He HH, He HN, He JC, He SL, He XB, He Y, Heller M, Hor YK, Hou C, Hou X, Hu HB, Hu S, Hu SC, Hu XJ, Huang DH, Huang QL, Huang WH, Huang XT, Huang ZC, Ji F, Ji XL, Jia HY, Jiang K, Jiang ZJ, Jin C, Kuleshov D, Levochkin K, Li BB, Li C, Li C, Li F, Li HB, Li HC, Li HY, Li J, Li K, Li WL, Li X, Li X, Li XR, Li Y, Li YZ, Li Z, Li Z, Liang EW, Liang YF, Lin SJ, Liu B, Liu C, Liu D, Liu H, Liu HD, Liu J, Liu JL, Liu JS, Liu JY, Liu MY, Liu RY, Liu SM, Liu W, Liu YN, Liu ZX, Long WJ, Lu R, Lv HK, Ma BQ, Ma LL, Ma XH, Mao JR, Masood A, Mitthumsiri W, Montaruli T, Nan YC, Pang BY, Pattarakijwanich P, Pei ZY, Qi MY, Ruffolo D, Rulev V, Sáiz A, Shao L, Shchegolev O, Sheng XD, Shi JR, Song HC, Stenkin YV, Stepanov V, Sun QN, Sun XN, Sun ZB, Tam PHT, Tang ZB, Tian WW, Wang BD, Wang C, Wang H, Wang HG, Wang JC, Wang JS, Wang LP, Wang LY, Wang RN, Wang W, Wang W, Wang XG, Wang XJ, Wang XY, Wang YD, Wang YJ, Wang YP, Wang Z, Wang Z, Wang ZH, Wang ZX, Wei DM, Wei JJ, Wei YJ, Wen T, Wu CY, Wu HR, Wu S, Wu WX, Wu XF, Xi SQ, Xia J, Xia JJ, Xiang GM, Xiao G, Xiao HB, Xin GG, Xin YL, Xing Y, Xu DL, Xu RX, Xue L, Yan DH, Yang CW, Yang FF, Yang JY, Yang LL, Yang MJ, Yang RZ, Yang SB, Yao YH, Yao ZG, Ye YM, Yin LQ, Yin N, You XH, You ZY, Yu YH, Yuan Q, Zeng HD, Zeng TX, Zeng W, Zeng ZK, Zha M, Zhai XX, Zhang BB, Zhang HM, Zhang HY, Zhang JL, Zhang JW, Zhang L, Zhang L, Zhang LX, Zhang PF, Zhang PP, Zhang R, Zhang SR, Zhang SS, Zhang X, Zhang XP, Zhang Y, Zhang Y, Zhang YF, Zhang YL, Zhao B, Zhao J, Zhao L, Zhao LZ, Zhao SP, Zheng F, Zheng Y, Zhou B, Zhou H, Zhou JN, Zhou P, Zhou R, Zhou XX, Zhu CG, Zhu FR, Zhu H, Zhu KJ, Zuo X. Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 γ-ray Galactic sources. Nature 2021; 594:33-36. [PMID: 34002091 DOI: 10.1038/s41586-021-03498-z] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 03/26/2021] [Indexed: 02/04/2023]
Abstract
The extension of the cosmic-ray spectrum beyond 1 petaelectronvolt (PeV; 1015 electronvolts) indicates the existence of the so-called PeVatrons-cosmic-ray factories that accelerate particles to PeV energies. We need to locate and identify such objects to find the origin of Galactic cosmic rays1. The principal signature of both electron and proton PeVatrons is ultrahigh-energy (exceeding 100 TeV) γ radiation. Evidence of the presence of a proton PeVatron has been found in the Galactic Centre, according to the detection of a hard-spectrum radiation extending to 0.04 PeV (ref. 2). Although γ-rays with energies slightly higher than 0.1 PeV have been reported from a few objects in the Galactic plane3-6, unbiased identification and in-depth exploration of PeVatrons requires detection of γ-rays with energies well above 0.1 PeV. Here we report the detection of more than 530 photons at energies above 100 teraelectronvolts and up to 1.4 PeV from 12 ultrahigh-energy γ-ray sources with a statistical significance greater than seven standard deviations. Despite having several potential counterparts in their proximity, including pulsar wind nebulae, supernova remnants and star-forming regions, the PeVatrons responsible for the ultrahigh-energy γ-rays have not yet been firmly localized and identified (except for the Crab Nebula), leaving open the origin of these extreme accelerators.
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Affiliation(s)
- Zhen Cao
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China. .,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China. .,University of Chinese Academy of Sciences, Beijing, China.
| | - F A Aharonian
- Dublin Institute for Advanced Studies, Dublin, Ireland. .,Max-Planck-Institut for Nuclear Physics, Heidelberg, Germany.
| | - Q An
- State Key Laboratory of Particle Detection and Electronics, Beijing, China.,University of Science and Technology of China, Hefei, China
| | - Axikegu
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - L X Bai
- College of Physics, Sichuan University, Chengdu, China
| | - Y X Bai
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y W Bao
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - D Bastieri
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - X J Bi
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Y J Bi
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - H Cai
- School of Physics and Technology, Wuhan University, Wuhan, China
| | - J T Cai
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - Zhe Cao
- State Key Laboratory of Particle Detection and Electronics, Beijing, China.,University of Science and Technology of China, Hefei, China
| | - J Chang
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - J F Chang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - X C Chang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - B M Chen
- Hebei Normal University, Shijiazhuang, China
| | - J Chen
- College of Physics, Sichuan University, Chengdu, China
| | - L Chen
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Liang Chen
- Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - Long Chen
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - M J Chen
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - M L Chen
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - Q H Chen
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - S H Chen
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - S Z Chen
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China. .,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.
| | - T L Chen
- Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa, Tibet, China
| | - X L Chen
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Y Chen
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - N Cheng
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y D Cheng
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - S W Cui
- Hebei Normal University, Shijiazhuang, China
| | - X H Cui
- National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
| | - Y D Cui
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - B Z Dai
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - H L Dai
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - Z G Dai
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - Danzengluobu
- Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa, Tibet, China
| | - D Della Volpe
- Département de Physique Nucléaire et Corpusculaire, Faculté de Sciences, Université de Genève, Geneva, Switzerland
| | - B D Ettorre Piazzoli
- Dipartimento di Fisica dell'Università di Napoli "Federico II", Complesso Universitario di Monte Sant'Angelo, Naples, Italy
| | - X J Dong
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - J H Fan
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - Y Z Fan
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - Z X Fan
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - J Fang
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - K Fang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - C F Feng
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - L Feng
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - S H Feng
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y L Feng
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - B Gao
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - C D Gao
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - Q Gao
- Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa, Tibet, China
| | - W Gao
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - M M Ge
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - L S Geng
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - G H Gong
- Department of Engineering Physics, Tsinghua University, Beijing, China
| | - Q B Gou
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - M H Gu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - J G Guo
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - X L Guo
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - Y Q Guo
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y Y Guo
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China.,Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - Y A Han
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, China
| | - H H He
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - H N He
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - J C He
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - S L He
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - X B He
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - Y He
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - M Heller
- Département de Physique Nucléaire et Corpusculaire, Faculté de Sciences, Université de Genève, Geneva, Switzerland
| | - Y K Hor
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - C Hou
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - X Hou
- Yunnan Observatories, Chinese Academy of Sciences, Kunming, China
| | - H B Hu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - S Hu
- College of Physics, Sichuan University, Chengdu, China
| | - S C Hu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - X J Hu
- Department of Engineering Physics, Tsinghua University, Beijing, China
| | - D H Huang
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - Q L Huang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - W H Huang
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - X T Huang
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - Z C Huang
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - F Ji
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - X L Ji
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - H Y Jia
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - K Jiang
- State Key Laboratory of Particle Detection and Electronics, Beijing, China.,University of Science and Technology of China, Hefei, China
| | - Z J Jiang
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - C Jin
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - D Kuleshov
- Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia
| | - K Levochkin
- Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia
| | - B B Li
- Hebei Normal University, Shijiazhuang, China
| | - Cong Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Cheng Li
- State Key Laboratory of Particle Detection and Electronics, Beijing, China.,University of Science and Technology of China, Hefei, China
| | - F Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - H B Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - H C Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - H Y Li
- University of Science and Technology of China, Hefei, China.,Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - J Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - K Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - W L Li
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - X Li
- State Key Laboratory of Particle Detection and Electronics, Beijing, China.,University of Science and Technology of China, Hefei, China
| | - Xin Li
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - X R Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y Li
- College of Physics, Sichuan University, Chengdu, China
| | - Y Z Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Zhe Li
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Zhuo Li
- School of Physics, Peking University, Beijing, China
| | - E W Liang
- School of Physical Science and Technology, Guangxi University, Nanning, China
| | - Y F Liang
- School of Physical Science and Technology, Guangxi University, Nanning, China
| | - S J Lin
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - B Liu
- University of Science and Technology of China, Hefei, China
| | - C Liu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - D Liu
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - H Liu
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - H D Liu
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, China
| | - J Liu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - J L Liu
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China.,School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
| | - J S Liu
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - J Y Liu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - M Y Liu
- Key Laboratory of Cosmic Rays (Tibet University), Ministry of Education, Lhasa, Tibet, China
| | - R Y Liu
- School of Astronomy and Space Science, Nanjing University, Nanjing, China.
| | - S M Liu
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - W Liu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y N Liu
- Department of Engineering Physics, Tsinghua University, Beijing, China
| | - Z X Liu
- College of Physics, Sichuan University, Chengdu, China
| | - W J Long
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - R Lu
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - H K Lv
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - B Q Ma
- School of Physics, Peking University, Beijing, China
| | - L L Ma
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - X H Ma
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - J R Mao
- Yunnan Observatories, Chinese Academy of Sciences, Kunming, China
| | - A Masood
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - W Mitthumsiri
- Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - T Montaruli
- Département de Physique Nucléaire et Corpusculaire, Faculté de Sciences, Université de Genève, Geneva, Switzerland
| | - Y C Nan
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - B Y Pang
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - P Pattarakijwanich
- Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Z Y Pei
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - M Y Qi
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - D Ruffolo
- Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - V Rulev
- Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia
| | - A Sáiz
- Department of Physics, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - L Shao
- Hebei Normal University, Shijiazhuang, China
| | - O Shchegolev
- Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia.,Moscow Institute of Physics and Technology, Moscow, Russia
| | - X D Sheng
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - J R Shi
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - H C Song
- School of Physics, Peking University, Beijing, China
| | - Yu V Stenkin
- Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia.,Moscow Institute of Physics and Technology, Moscow, Russia
| | - V Stepanov
- Institute for Nuclear Research of Russian Academy of Sciences, Moscow, Russia
| | - Q N Sun
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - X N Sun
- School of Physical Science and Technology, Guangxi University, Nanning, China
| | - Z B Sun
- National Space Science Center, Chinese Academy of Sciences, Beijing, China
| | - P H T Tam
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - Z B Tang
- State Key Laboratory of Particle Detection and Electronics, Beijing, China.,University of Science and Technology of China, Hefei, China
| | - W W Tian
- University of Chinese Academy of Sciences, Beijing, China.,National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
| | - B D Wang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - C Wang
- National Space Science Center, Chinese Academy of Sciences, Beijing, China
| | - H Wang
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - H G Wang
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - J C Wang
- Yunnan Observatories, Chinese Academy of Sciences, Kunming, China
| | - J S Wang
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China.,School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
| | - L P Wang
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - L Y Wang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - R N Wang
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - W Wang
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - W Wang
- School of Physics and Technology, Wuhan University, Wuhan, China
| | - X G Wang
- School of Physical Science and Technology, Guangxi University, Nanning, China
| | - X J Wang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - X Y Wang
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - Y D Wang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y J Wang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y P Wang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Zheng Wang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - Zhen Wang
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China.,School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
| | - Z H Wang
- College of Physics, Sichuan University, Chengdu, China
| | - Z X Wang
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - D M Wei
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - J J Wei
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - Y J Wei
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - T Wen
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - C Y Wu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - H R Wu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - S Wu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - W X Wu
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - X F Wu
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - S Q Xi
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - J Xia
- University of Science and Technology of China, Hefei, China.,Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - J J Xia
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - G M Xiang
- University of Chinese Academy of Sciences, Beijing, China.,Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - G Xiao
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - H B Xiao
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - G G Xin
- School of Physics and Technology, Wuhan University, Wuhan, China
| | - Y L Xin
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - Y Xing
- Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - D L Xu
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China.,School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
| | - R X Xu
- School of Physics, Peking University, Beijing, China
| | - L Xue
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - D H Yan
- Yunnan Observatories, Chinese Academy of Sciences, Kunming, China
| | - C W Yang
- College of Physics, Sichuan University, Chengdu, China
| | - F F Yang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - J Y Yang
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - L L Yang
- School of Physics and Astronomy & School of Physics (Guangzhou), Sun Yat-sen University, Zhuhai, China
| | - M J Yang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - R Z Yang
- University of Science and Technology of China, Hefei, China.
| | - S B Yang
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - Y H Yao
- College of Physics, Sichuan University, Chengdu, China
| | - Z G Yao
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Y M Ye
- Department of Engineering Physics, Tsinghua University, Beijing, China
| | - L Q Yin
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - N Yin
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - X H You
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Z Y You
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Y H Yu
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - Q Yuan
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - H D Zeng
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - T X Zeng
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - W Zeng
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - Z K Zeng
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China
| | - M Zha
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - X X Zhai
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - B B Zhang
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - H M Zhang
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - H Y Zhang
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - J L Zhang
- National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
| | - J W Zhang
- College of Physics, Sichuan University, Chengdu, China
| | - L Zhang
- Hebei Normal University, Shijiazhuang, China
| | - Li Zhang
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - L X Zhang
- Center for Astrophysics, Guangzhou University, Guangzhou, China
| | - P F Zhang
- School of Physics and Astronomy, Yunnan University, Kunming, China
| | - P P Zhang
- Hebei Normal University, Shijiazhuang, China
| | - R Zhang
- University of Science and Technology of China, Hefei, China.,Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - S R Zhang
- Hebei Normal University, Shijiazhuang, China
| | - S S Zhang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - X Zhang
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - X P Zhang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Yong Zhang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - Yi Zhang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
| | - Y F Zhang
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - Y L Zhang
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - B Zhao
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - J Zhao
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - L Zhao
- State Key Laboratory of Particle Detection and Electronics, Beijing, China.,University of Science and Technology of China, Hefei, China
| | - L Z Zhao
- Hebei Normal University, Shijiazhuang, China
| | - S P Zhao
- Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China.,Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - F Zheng
- National Space Science Center, Chinese Academy of Sciences, Beijing, China
| | - Y Zheng
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - B Zhou
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
| | - H Zhou
- Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai, China.,School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China
| | - J N Zhou
- Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - P Zhou
- School of Astronomy and Space Science, Nanjing University, Nanjing, China
| | - R Zhou
- College of Physics, Sichuan University, Chengdu, China
| | - X X Zhou
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - C G Zhu
- Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, China
| | - F R Zhu
- School of Physical Science and Technology & School of Information Science and Technology, Southwest Jiaotong University, Chengdu, China
| | - H Zhu
- National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China
| | - K J Zhu
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China.,University of Chinese Academy of Sciences, Beijing, China.,State Key Laboratory of Particle Detection and Electronics, Beijing, China
| | - X Zuo
- Key Laboratory of Particle Astrophysics & Experimental Physics Division & Computing Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China.,TIANFU Cosmic Ray Research Center, Chengdu, Sichuan, China
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