Speaker
Description
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton liquid scintillator detector and began data-taking in full liquid scintillator state from August 2025. The primary physics goal is to determine the neutrino mass ordering through a precise measurement of the reactor anti-neutrino energy spectrum via the inverse beta decay (IBD). This requires a dedicated calibration of energy non-linearity and resolution of positrons in the JUNO detector.
This poster presents two different methods to model the JUNO detector’s response, based on Geant4 simulations and nuclear databases respectively. Both models are constrained by the calibration data of various radioactive sources (i.e. $^{68}Ge$, AmC, etc.) as well as the beta decays from cosmogenic isotopes ($^{12}B$ and $^{11}C$). The models are consistent within 1σ despite utilizing different energy reconstructions and modeling methods. Furthermore, both methods are able to provide precise predictions for the energy non-linearity and positron resolution for JUNO oscillation analysis, by performing combined fits of the source data and taking into account the contribution from instrumental non-linearity.