Daya Bay Reactor Neutrino Experiment

The Daya Bay Reactor Neutrino Experiment was a China-based multinational particle physics project studying neutrinos, in particular neutrino oscillations. The experiment operated in 2011–2020. The multinational collaboration includes researchers from China, Chile, the United States, Taiwan (Republic of China), Russia, and the Czech Republic. The US side of the project is funded by the US Department of Energy's Office of High Energy Physics. The experiment was situated at Daya Bay, approximately 52 kilometers northeast of Hong Kong and 45 kilometers east of Shenzhen. There was an affiliated project in the Aberdeen Tunnel Underground Laboratory in Hong Kong. The Aberdeen lab measured the neutrons produced by cosmic muons which may affect the Daya Bay Reactor Neutrino Experiment. The experiment consisted of eight antineutrino detectors, clustered in three locations within 1.9 km (1.2 mi) of six nuclear reactors. Each detector consisted of 20 tons of liquid scintillator (linear alkylbenzene doped with gadolinium) surrounded by photomultiplier tubes and shielding. A much larger follow-up is the Jiangmen Underground Neutrino Observatory (JUNO) in Kaiping, which uses an acrylic sphere filled with 20,000 tons of liquid scintillator to detect reactor antineutrinos. The experiment started data collection in 2025.

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