The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment currently under construction in southern China, in an underground laboratory with approximately 650 m of rock overburden (1800 m.w.e.). The detector consists of a 20 kton liquid scintillator target, contained inside a 35.4-meter-diameter spherical acrylic vessel. The sphere is submerged in an ultra-pure water pool, which acts as a Cerenkov radiation veto system for cosmic rays and ensures minimal environmental radioactivity contamination. The central detector (CD) is equipped with 17,612 20-inch and 25,600 3-inch Photomultipliers Tubes (PMTs), providing more than 75% total photocathode coverage.
JUNO's main goal is the determination of the neutrino mass ordering with reactor antineutrinos, emitted from two adjacent nuclear power plants on a $\sim$ 52.5 km baseline from the experimental site, and detected through the inverse beta decay reaction. The oscillated energy spectrum in JUNO changes subtly depending on the neutrino mass ordering, thus providing sensitivity to this parameter. To achieve a achieve a $\sim 3-4\sigma$ significance in about 6 years of data-taking, high energy resolution ( $\leq 3\%$ at 1 MeV) and overall non-linearity effects below 1% are needed.
Furthermore, JUNO will be the first experiment to simultaneously probe the effects of solar ($\Delta m_{21}^{2}$) and atmospheric ($\Delta m_{31}^{2}$) oscillations; it will be able to measure four oscillation parameters: $\Delta m_{21}^{2}$, $\Delta m_{31}^{2}$, $\sin^2\theta_{12}$, and $\sin^2\theta_{13}$, achieving a sub-percent precision for the first three parameters.
This contribution will focus on JUNO's oscillation physics potential, with a particular emphasis on the reactor antineutrino analysis.