Overview

• JUNO, a 35‑meter sphere holding more than 20,000 tonnes of liquid scintillator 700 meters underground near Jiangmen, has started taking data.
• The collaboration’s primary objective is to determine whether neutrino masses follow a normal or inverted ordering through high‑precision reactor antineutrino measurements.
• Researchers anticipate roughly six years of data collection to approach a statistically significant result on the mass ordering question, according to the experiment’s leaders.
• The detector uses a dense array of photomultiplier tubes around an acrylic‑lined vessel to capture single‑photon flashes from rare neutrino interactions and can register both neutrinos and antineutrinos from nearby reactors.
• Press coverage cites Wang Yifang reporting an early interaction rate of about 50 detectable flashes per day, implying on the order of 100,000 events over six years.