Abstract
Cosmic Ray and neutrino oscillation physics can be studied by using atmospheric neutrinos. JUNO (Jiangmen Underground Neutrino Observatory) is a large liquid scintillator detector with low energy detection threshold and excellent energy resolution. The detector performances allow the atmospheric neutrino oscillation measurements. In this work, a discrimination algorithm for different reaction channels of neutrino-nucleon interactions in the JUNO liquid scintillator, in the GeV/sub-GeV energy region, is presented. The atmospheric neutrino flux is taken as reference, considering $\mathop {{v_\mu }}\limits^{( - )} $ and $\mathop {{v_e}}\limits^{( - )} $. The different temporal behaviour of the classes of events have been exploited to build a timeprofile-based discrimination algorithm. The results show a good selection power for $\mathop {{v_e}}\limits^{( - )} $ CC events, while the $\mathop {{v_\mu }}\limits^{( - )} $ CC component suffers of an important contamination from NC events at low energy, which is under study. Preliminary results are presented.
Highlights
The origin and properties of Cosmic Rays (CRs) are still matter of study by a number of experiments.A fraction of the energy of an air shower, resulting after a CR interaction in the atmosphere, is carried by neutrinos
The results show a good selection power for νe CC events, while the CC component suffers of an important contamination from NC
An event time-profile algorithm is used for the e/μ separation after atmospheric neutrinos interaction in the JUNO detector
Summary
The origin and properties of Cosmic Rays (CRs) are still matter of study by a number of experiments. A fraction of the energy of an air shower, resulting after a CR interaction in the atmosphere, is carried by neutrinos. After the experimental results in past years [1,2,3,4], further contributions to the atmospheric ν spectrum will come from the generation of neutrino detectors, operating in the decade. JUNO is a√large liquid scintillator detector with low energy threshold and excellent energy resolution (∼ 3%/ E [MeV]), under construction in China [5]. 20" PMTs and 25.000 3" PMTs. Given the large fiducial volume and the excellent energy resolution, JUNO will be able to detect atmospheric neutrinos.
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