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T: Fachverband Teilchenphysik
T 66: Neutrino Physics IV
T 66.6: Vortrag
Donnerstag, 19. März 2026, 17:30–17:45, AudiMax
JUNO detector response determination through calibration data — •Marco Malabarba1,2 and Livia Ludhova1,2 — 11GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany — 22Institute of Physics and EC PRISMA+, Johannes Gutenberg Universität Mainz, Mainz, Germany
JUNO (Jiangmen Underground Neutrino Observatory) is a multipurpose neutrino physics experiment in China. Its construction ended in 2024 and it has been taking data since August 2025. The target consists of 20 kton of organic liquid scintillator. The optical photons are collected by photomultiplier tubes which provide a geometrical coverage of ∼78%. JUNO has already achieved world leading precision on the neutrino solar oscillation parameters with 59.1 days of data taking. To obtain this result, as well as to achieve its future goal of determining the neutrino mass ordering, an evaluation of the detector response, in terms of temporal stability, detector non-uniformity, energy resolution, and energy non-linearity, is needed. All these quantities can be determined both through calibration (137Cs, 54Mn, 68Ge, 40K, 60Co, AmC, and laser) and natural sources (such as 214Po, spallation neutrons, and some cosmogenic isotopes as 12B and 11C). In this talk, an analysis of the calibration sources will be presented. In particular, different fit models have been developed to take into account the different decay details of each individual nuclide. The results allow to infer the concentration of 14C and, when combined with the spectra of 12B and 11C, also to determine the energy non-linearity for e−, e+, and γ, an essential building block for reactor neutrino analysis.
Keywords: JUNO; neutrino; calibration; oscillation parameters; C14