Capturing ghost particles 700 meters underground, the first physical results of the Jiangmen Neutrino Experiment will be released tomorrow

The construction of the Jiangmen Neutrino Experiment Facility took 12 years to complete. A press conference on the success of the construction of the Jiangmen Neutrino Experiment Facility and its first physical results will be held at 10 a.m. tomorrow.The Jiangmen Neutrino Experiment (JUNO), located about 700 meters underground in Jiangmen, Guangdong, China, is a large-scale experiment designed to reveal the basic properties of neutrinos.

Its main scientific goal is to determine the mass order of neutrinos, measure neutrino oscillation parameters with high precision, and deepen human understanding of the basic properties of neutrinos.

JUNO officially started taking numbers on August 26, 2025. This report will release JUNO’s first physical results.

It is reported that the core detector equipment of the Jiangmen neutrino experiment is a liquid scintillator detector (central detector) with an effective mass of approximately 20,000 tons.

It is located in the center of a 44-meter-deep pool in an experimental hall 700 meters underground.The 41.1-meter-diameter stainless steel mesh shell is the main support structure of the detector, carrying a 35.4-meter-diameter organic glass ball, 20,000 tons of liquid scintillator, 20,000 20-inch photomultiplier tubes and many other detector components.

The photomultiplier tubes covering the inner wall of the central detector are used to detect the scintillation light produced when neutrinos are "captured" by liquid scintillator, and convert the optical signal into an electrical signal output for scientific researchers to carry out research work.

Compared with the current best level in the world, the liquid scintillator volume of the Jiangmen Neutrino Center detector has increased by 20 times, the photoelectron output has increased by 3 times, and the energy resolution has reached an unprecedented 3%.

Scientists will use this device to capture and detect neutrinos, the oldest and most primitive elementary particles in the universe, also known as "ghost particles."

Neutrinos have played an important role from the moment the universe was created, playing an important role in the most microscopic material world and the most macroscopic universe. Without neutrinos, the sun would not shine, and there would be no Milky Way, Earth, or humans.