Reconstruction of a muon bundle in the JUNO central detector

Cheng-Feng Yang; Yong-Bo Huang; Ji-Lei Xu; Di-Ru Wu; Yong-Peng Zhang; Wu-Ming Luo; Miao He; Guo-Ming Chen; Si-Yuan Zhang

doi:10.1007/s41365-022-01049-3

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Reconstruction of a muon bundle in the JUNO central detector

NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH | Updated：2022-07-27

- Reconstruction of a muon bundle in the JUNO central detector
- Nuclear Science and Techniques Vol. 33, Issue 5, Article number: 59(2022)
- Affiliations：
  
  1.School of Physical Science and Technology, Guangxi University, Nanning 530004, China
  2.Institute of High Energy Physics, Beijing 100049, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  Yong-Bo Huang, huangyb@gxu.edu.cn
  Ji-Lei Xu, xujl@ihep.ac.cn
- Funds：
- DOI：10.1007/s41365-022-01049-3
  CLC：
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Cheng-Feng Yang, Yong-Bo Huang, Ji-Lei Xu, et al. Reconstruction of a muon bundle in the JUNO central detector. [J]. Nuclear Science and Techniques 33(5):59(2022)
DOI：

Cheng-Feng Yang, Yong-Bo Huang, Ji-Lei Xu, et al. Reconstruction of a muon bundle in the JUNO central detector. [J]. Nuclear Science and Techniques 33(5):59(2022) DOI： 10.1007/s41365-022-01049-3.

摘要

Abstract

The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment. One of the main goals is to determine the neutrino mass ordering by precisely measuring the energy spectrum of reactor antineutrinos. For the detection of reactor antineutrinos, cosmogenic backgrounds, such as ,9,Li/,8,He and fast neutrons induced by cosmic muons, should be rejected carefully by applying muon veto cuts, which require good muon track reconstruction. With a 20-kton liquid scintillator detector, the simulation shows the proportion of muon bundles (muon multiplicity ,≥,2) to be approximately 8% in JUNO, whereas its reconstruction has been rarely discussed in previous experiments. This study proposes an efficient algorithm for muon track reconstruction based on the charge response of a photomultiplier tube array. This is the first reconstruction of muon bundles in a large-volume liquid scintillator detector. In addition, the algorithm shows good performance and potential for reconstruction for both a single muon and double muons (muon multiplicity = 2). The spatial resolution of a single-muon reconstruction was 20 cm, and the angular resolution was 0.5°. For double-muon reconstruction, the spatial and angular resolutions could be 30 cm and 1.0°, respectively. Moreover, this paper also discusses muon classification and the veto strategy.

关键词

Keywords

JUNOLiquid scintillator detectorMuon reconstructionMuon bundleVeto strategy

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