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

Abstract

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 $\sigma$ 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.

arXiv comment19 pages and 12 figures, submitted to Journal of Instrumentation

References in corpus (9)

• Neutrino Physics with JUNO
• Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity
• The angular distribution of the reaction ${\bar{\nu }}_e+p\to e^{+}+n$
• Precise quasielastic neutrino/nucleon cross section
• Simultaneous Precision Spectroscopy of $pp$, ${}^7$Be, and $pep$ Solar Neutrinos with Borexino Phase-II
• Production of Gadolinium-loaded Liquid Scintillator for the Daya Bay Reactor Neutrino Experiment
• Positronium signature in organic liquid scintillators for neutrino experiments
• The Application of SNiPER to the JUNO Simulation
• Measurement of $\alpha$-particle quenching in LAB based scintillator in independent small-scale experiments

Cited by in corpus (2)

• Calibration Strategy of the JUNO Experiment
• Determine Energy Nonlinearity and Resolution of $e^{\pm }$ and $\gamma$ in Liquid Scintillator Detectors by A Universal Energy Response Model