US EditionChina Launches World’s Most Powerful Neutrino Detector
JUNO's 20,000-ton liquid scintillator detector, operated by over 700 researchers from 74 institutions, aims to clarify neutrino mass ordering and improve oscillation parameter precision.
- A major milestone was reached on August 26, 2025, when the neutrino experiment facility located near Jiangmen in Guangdong, China, finished filling its 20,000-ton liquid scintillator detector and officially began collecting data.
- JUNO was initially proposed in 2008 and received official approval from relevant scientific and provincial authorities in 2013. Construction began underground in 2015, marking the start of over ten years dedicated to its design, development, and assembly.
- The detector’s central 35.4-meter acrylic sphere is surrounded by 20,000 photomultiplier tubes and ultra-pure water, enabling high-precision measurements of neutrinos from reactors, the Sun, atmosphere, and Earth.
- Particle physicist Wang Yifang described the completion of JUNO's filling as a significant achievement, highlighting that the detector's operation will provide critical insights into the fundamental properties of matter and the cosmos.
- JUNO aims to determine neutrino mass ordering independently of Earth matter effects and improve oscillation parameter precision by an order of magnitude, shaping future neutrino physics research.
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The neutrinos, called "phantom particles," pierce billions of them through our body every second without a trace.
Scientists switch on the world’s largest neutrino detector deep underground
Deep beneath southern China, JUNO has launched one of the most ambitious neutrino experiments in history. With its massive 20,000-ton liquid scintillator detector now operational, it’s poised to answer one of particle physics’ greatest mysteries: the true ordering of neutrino masses. Built over more than a decade and involving hundreds of scientists worldwide, JUNO not only promises to resolve questions about the building blocks of matter but al…
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