A new chapter in neutrino physics has begun.
JUNO, the Jiangmen Underground Neutrino Observatory in China, has released its first major results based on just two months of data collection.
The findings offer the most precise measurements yet of how neutrinos "oscillate"—or change flavor—between their three known types.
Located 700 meters underground, JUNO is a spherical detector designed to capture antineutrinos emitted from two nearby nuclear power plants.
The primary goal of the experiment is to determine the mass hierarchy of neutrinos: specifically, whether two types are heavy and one is light, or vice versa. This question remains unresolved.
Despite not yet answering the hierarchy question, the results are significant. They successfully demonstrate JUNO's world-class capabilities and precision.
The race for deeper answers is now global. Competing detectors—Hyper-Kamiokande in Japan and the Deep Underground Neutrino Experiment (DUNE) in the United States—are expected to begin their own data collection within the next decade.