Speaker
Description
The Jiangmen Underground Neutrino Observatory (JUNO) is a reactor neutrino experiment located in South China. JUNO’s primary objective is to determine the neutrino mass ordering (NMO) and precisely measure three oscillation parameters, $\Delta m_{31}^{2}$, $\Delta m_{21}^{2}$, and $\sin^2\theta_{12}$, opening a new era of precision neutrino oscillation physics. JUNO detects electron antineutrinos emitted from two nearby nuclear power plants at an average baseline of approximately 52.5 km, corresponding to the first solar oscillation maximum, via the inverse beta decay reaction.
The central detector consists of a 20-kton liquid scintillator target contained within a 35.4-m-diameter acrylic sphere. The sphere is submerged in a 44-m-deep water pool serving as a passive shield and a water Cherenkov detector for muon tagging.
After four years of detector construction and nine months of continuous
operation during its commissioning phase, JUNO began physics data taking at the end of August 2025. Using 59 days of data collected between August 26 and November 2, JUNO measured the solar parameters $\Delta m_{21}^{2}$, and $\sin^2\theta_{12}$ with a precision improved by a factor of 1.5-1.8 compared to previous experiments.
This poster presents the spectral fitting framework, statistical methodology, and treatment of systematic uncertainties in JUNO’s oscillation measurement with reactor antineutrinos. The most recent oscillation results will also be presented.