JUNO Neutrino Observatory reports first precision measurements

June 12, 2026

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The Jiangmen Underground Neutrino Observatory in China has published its initial physics results, delivering highly precise data on neutrino oscillation parameters after just 59 days of operation.

The Jiangmen Underground Neutrino Observatory achieved its first major milestone when Nature published the experiment's debut result as a cover article on June 10.

Using validated data collected between August 26 and November 2, 2025, the international JUNO Collaboration reduced uncertainties in two key neutrino oscillation parameters by a factor of 1.6 compared with prior experiments spanning decades.

The detector, located 700 meters underground, features a 20,000-ton liquid scintillator and began collecting data in August 2025. It is designed to determine the neutrino mass ordering and measure mixing parameters to better than 1 percent precision.

Prof. Arthur McDonald, 2015 Nobel laureate, stated that JUNO has met its design objectives for radiopurity, energy resolution, and stability. Researchers expect additional results starting this summer.

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