China's JUNO Neutrino Detector Achieves Record Precision in Measuring Neutrino Oscillations
China's Jiangmen Underground Neutrino Observatory (JUNO) has measured how neutrinos change identities in flight with unprecedented precision using just two months of data, surpassing decades of work by previous experiments. The detector uses a 35-meter sphere filled with 20,000 tonnes of organic solution and 43,000 light detectors to observe neutrinos from nuclear reactors over 53 kilometers away. These measurements represent a crucial step toward understanding why neutrinos have mass, one of particle physics' biggest unsolved questions.
The Jiangmen Underground Neutrino Observatory (JUNO) in Guangdong, China has demonstrated remarkable sensitivity in its initial operations, measuring neutrino oscillation parameters—how neutrinos switch between three 'flavours' (electron, muon, and tau)—with 1.6 times better precision than all previous experiments combined, despite collecting data for only 59 days. The detector consists of a 35-meter-wide acrylic sphere containing 20,000 tonnes of organic solution and lined with 43,000 photomultiplier tubes that detect faint flashes of light produced when neutrinos collide with atomic nuclei. The results, published in Nature, focused on electron neutrinos produced by nuclear reactors located more than 53 kilometers away. Neutrinos remain mysterious particles whose masses cannot be explained by the standard model of particle physics, and studying oscillation patterns is the primary method for understanding their mass origins. The achievement is particularly significant because many researchers had doubted JUNO could reach its planned sensitivity levels, making this early success a validation of the experiment's design and construction.
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- Nature NewsCenter
Chinese detector edges closer to solving the mystery of neutrino mass
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