Study on the efficiency of the underground muon detectors in YangBaJing Hybrid Array

  • Zhen Wang
  • Youliang FengEmail author
  • Cheng Liu
  • Yiqing Guo
  • Hongbo Hu
  • Tianlu Chen
  • Danzeng Luobu
  • Jiancheng He
  • Yuhua Yao
  • Yi Zhang
Original Paper



The \(\gamma \)-ray astronomy at 100 TeV is important to unravel the puzzles related to the origin and acceleration of the Galactic cosmic rays up to PeV energy. The YangBaJing Hybrid Array (YBJ-HA), about 2% the scale of LHAASO-KM2A, is such a kind of detection instrument capable of detecting 100 TeV \(\gamma \)-rays. And the muon detection efficiency stability of the MD array in YBJ-HA is crucial for high quality \(\gamma \)-ray observation. To measure and monitor the muon detection efficiency, we develop a method in this work.


We develop a muon bundle method to measure and monitor the efficiency of each muon detector. In this method, muon detection efficiency of the target MD unit is calculated based on the surrounding MD units and the MC simulation.


The average actual muon detection efficiency of the 16 MD units is up to 83.4% during 4 years’ observation.


The muon detection efficiency of each MD unit is found to be stable during 4 years’ operation. In the future, a similar method may be applicable to the muon detection efficiency study for LHAASO.


Detection efficiency Muon detector EAS 



This work is partly supported by National Natural Science Foundation of China under Grant: 11635011, 11761141001, 11873005, 11775233 and National Key R&D Program of China: 2018YFA0404202.


  1. 1.
    A. Abramowski et al., Acceleration of petaelectronvolt protons in the Galactic Centre. Nature 531, 476–479 (2016)ADSCrossRefGoogle Scholar
  2. 2.
    S.R. Kelner, A. Felex, V.V. Aharonian, Bugayov, Energy spectra of gamma rays, electrons, and neutrinos produced at proton–proton interactions in the very high energy regime. Phys. Rev. D 79, 039901 (2006)ADSCrossRefGoogle Scholar
  3. 3.
    Z. Wang et al., Performance of a scintillation detector array operated with LHAASO-KM2A electronics. Exp. Astron. 45, 1–15 (2018)CrossRefGoogle Scholar
  4. 4.
    C. Liu et al., Performance of the muon detector A under TIBET III array. Chin. Phys. C 37, 026001 (2013)ADSCrossRefGoogle Scholar
  5. 5.
    M. Amenomori et al., Tibet air shower array: results and future plan. J. Phys. Conf. Ser. 120, 6 (2008)CrossRefGoogle Scholar
  6. 6.
    X. Liu et al., Prototype of readout electronics for the LHAASO KM2A electromagnetic particle detectors. Chin. Phys. C 40, 076101 (2016)ADSCrossRefGoogle Scholar
  7. 7.
    H. He et al., Design of the LHAASO detectors. Radiat. Detect. Technol. Methods 98, 7 (2018)CrossRefGoogle Scholar
  8. 8.
    D. Heck et al., CORSIKA: a Monte Carlo code to simulate extensive air showers, No. FZKA-6019 (1998)Google Scholar
  9. 9.
    S. Agostinelli et al., Nucl. Instrum. Methods Phys. Res. A 506, 250 (2003)ADSCrossRefGoogle Scholar

Copyright information

© Institute of High Energy Physics, Chinese Academy of Sciences; Nuclear Electronics and Nuclear Detection Society 2019

Authors and Affiliations

  1. 1.Key Laboratory of Particle Astrophysics, Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.Physics Department of Science SchoolTibet UniversityLhasaChina
  4. 4.College of Physical Science and TechnologySichuan UniversityChengduChina

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