The JUNO detector seen from outside. JUNO Collaboration
China’s JUNO team has published its first physics results, marking an important milestone for one of the world’s most advanced neutrino experiments.
Located in Guangdong Province, the Jiangmen Underground Neutrino Observatory (JUNO) began collecting data in August 2025. Its main goal is to determine the mass ordering of neutrinos, tiny particles that have almost no mass, carry no electric charge, and rarely interact with matter, making them extremely difficult to detect.
Using data gathered over 59 days, JUNO made highly precise measurements of two key neutrino oscillation parameters. The results reduced measurement uncertainties by a factor of 1.6 compared with previous combined results from experiments conducted over the past decades.
Researchers say the findings confirm the detector’s excellent performance and establish JUNO as a major contributor to the next generation of precision neutrino research. The observatory is also expected to study neutrinos from supernovae, the Sun, Earth’s interior, and the atmosphere.
The JUNO team plans to release more scientific results as additional data is collected, helping scientists better understand some of the universe’s most mysterious particles.
Why it matters:
The achievement represents a significant advance in neutrino research. More precise measurements will help scientists uncover how neutrinos behave, determine their mass hierarchy, and test fundamental theories of particle physics. The results also demonstrate that JUNO is operating successfully and could play a key role in future discoveries about the universe, stars, the Earth, and the origins of matter itself.
The results were published in the journal Nature
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