Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 63: Invited Overview Talks IV
T 63.2: Invited Overview Talk
Thursday, March 19, 2026, 11:30–12:00, AudiMax
JUNO’s First Light: High-Precision Reactor Neutrino Oscillations — •Michael Wurm for the JUNO collaboration — Johannes Gutenberg-Universität Mainz, Germany
The JUNO experiment in southern China is designed for a high-precision measurement of reactor antineutrino oscillations. With a 20-kiloton liquid scintillator target and 17,600 20-inch photomultiplier tubes, JUNO is the largest detector of its kind and is expected to achieve an exceptional energy resolution of about 3 % at 1 MeV. Located 55 km from the Taishan and Yangjiang nuclear power plants, JUNO is located at the first solar oscillation maximum, enabling precise measurements of the oscillation pattern and sensitivity to the neutrino mass ordering. This configuration also provides outstanding sensitivity to the solar oscillation parameters, θ12 and Δ m122.
JUNO began operations in August 2025. Following a brief calibration phase, 59 days of stable data-taking were analyzed to deliver the first oscillation results, improving the uncertainties on the solar oscillation parameters by a factor of 1.6 relative to the combination of all previous measurements.
Having demonstrated performance consistent with and in some cases exceeding design specifications, JUNO will continue data collection to accumulate the statistics required for a definitive determination of the neutrino mass ordering. In parallel, its unprecedented size makes JUNO a powerful observatory for astrophysical neutrinos, particularly those from the Sun and core-collapse supernovae.
Keywords: Reactor neutrinos; Neutrino oscillations; Liquid scintillator detectors; JUNO experiment