Jiangmen Underground Neutrino Observatory

It aims to determine the neutrino mass hierarchy and perform precision measurements of the Pontecorvo–Maki–Nakagawa–Sakata matrix elements.

Originally scheduled to begin taking data in 2023,[6] as of October 2024, the US$376 million JUNO facility is slated to come online in the latter half of 2025.

[10]: 9  Instead it was moved west to a site (Jingji town, Kaiping, Jiangmen)[5] located 53 km from both of the Yangjiang and Taishan nuclear power plants.

The main approach of the JUNO Detector in measuring neutrino oscillations is the observation of electron antineutrinos (νe) coming from two nuclear power plants at approximately 53 km distance.

[13] The quantitative part of the experiment requires measuring neutrino flavour oscillations as a function of distance.

Predicted oscillation probability of electron neutrinos (black) oscillating to muon (blue) or tau (red) neutrinos, as a function of distance from source. Existing short-baseline experiments measure the first small dip in the black curve at 500 km/GeV; JUNO will observe the large dip at 16000 km/GeV. For reactor neutrinos with an energy of ≈3 MeV, the distances are ≈1.5 km and ≈50 km, respectively. This plot is based on assumed mixing parameters; the measured shape will differ and allow the actual parameters to be computed.