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Description
In large volume liquid scintillator detectors such as the center detector of Jiangmen Underground Neutrino Observatory (JUNO), the shower muons contribute most of the cosmogenic isotopes, and the isotopes are mainly produced within a few meters around the shower vertex. Cosmogenic isotopes, especially $^{9}$Li/$^{8}$He, are the main background for the JUNO's measurement of reactor neutrinos, so these isotopes need to be labeled and rejected. An effective method is to reconstruct the vertex of the shower muon, and then exclude the events in the space around the shower muon vertex according to the correlation of spatial distribution, thus excluding most of the cosmogenic isotopes at the same time. Compared with non-shower muons, the energy deposition of shower muons in liquid scintillator will cause additional significant peaks in the waveforms of photomultiplier tubes (PMT). This information is used in this paper to study the vertex reconstruction of shower muons. As a result, for a single shower muon within 16~m, the deviation of its reconstructed vertex can be controlled to about 0.4~m, and the resolution of the reconstructed vertex is about 0.7~m.
| Collaboration you are representing | JUNO |
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