A semi-analytical energy response model for low-energy events in JUNO

The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation neutrino experiment under construction in China expected to be completed in 2022. As the main goal it aims to determine the neutrino mass ordering with 3–4 σ significance using a 20 kton liquid scintillator detector. It will m...

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Bibliographic Details
Published in:Journal of instrumentation 2020-10, Vol.15 (10), p.P10007-P10007
Main Authors: Kampmann, P., Cheng, Y., Ludhova, L.
Format: Article
Language:English
Subjects:
Algorithms
Antiparticles
Conversion
Electrons
Energy resolution
Energy spectra
Linearity
Neutrinos
Nonlinearity
Nuclear electric power generation
Nuclear energy
Nuclear power plants
Positrons
Scintillation counters
Sensors
Underground construction
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Summary:The Jiangmen Underground Neutrino Observatory (JUNO) is a next-generation neutrino experiment under construction in China expected to be completed in 2022. As the main goal it aims to determine the neutrino mass ordering with 3–4 σ significance using a 20 kton liquid scintillator detector. It will measure the oscillated energy spectrum of electron anti-neutrinos from two nuclear power plants at about 53 km baseline with an unprecedented energy resolution of 3% at 1 MeV . A requirement of the JUNO experiment is the knowledge of the energy non-linearity of the detector with a sub-percent precision. As the light yield of the liquid scintillator is not fully linear to the energy of the detected particle and dependent on the particle type, a model for this light yield is presented in this paper. Based on an energy non-linearity model of electrons, this article provides the conversion to the more complex energy response of positrons and gammas. This conversion uses a fast and simple algorithm to calculate the spectrum of secondary electrons generated by a gamma, which is introduced here and made open access to potential users. It is also discussed how the positron non-linearity can be obtained from the detector calibration with gamma sources using the results presented in this article.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/15/10/P10007