JUNO hits the ground to crack neutrino physics mystery

S&T – PHYSICS

14 JUNE 2026

• The Jiangmen Underground Neutrino Observatory (JUNO) collaboration in China has published its first results.
• Based on 59 days of data collected in late 2025, the group calculated how often particles called neutrinos from nuclear reactors change their flavour, or type, as they travel.
• The findings showed JUNO was working as expected and on track to help crack a tough open question called neutrino mass ordering: of the three flavours of neutrinos, which are heaviest and lightest?