On the 20th, the main body of the Jiangmen Neutrino Experiment detector located 700 meters underground was completed. Neutrinos, as one of the fundamental particles that make up the material world, are not only the oldest and most numerous matter particles in the universe, but also highly mysterious due to their extremely light mass, motion speed close to the speed of light, and almost no reaction with any matter. Since the discovery of neutrinos in 1956, human exploration and research on neutrinos have never stopped. Due to the extremely difficult detection of neutrinos, there are still many unsolved mysteries. In order to further explore the mysteries of neutrinos, the Jiangmen Neutrino Experiment officially started in 2015. The primary scientific objective of this experiment is to measure the mass order of neutrinos, and multiple major cutting-edge interdisciplinary studies are conducted simultaneously. The reporter learned that due to the extremely strong penetration power of neutrinos, the Jiangmen Neutrino Experiment Detector, built 700 meters underground, can effectively shield cosmic rays and other external interference without hindering the capture of neutrinos. The Jiangmen Neutrino Experiment detector equipment is a liquid scintillation detector with an effective mass of 20000 tons. "The 41.1m diameter stainless steel reticulated shell is the main support structure of the detector." Cao Jun, Deputy Director of the Institute of High Energy Physics of the Chinese Academy of Sciences and Executive Deputy Manager of the Jiangmen Neutrino Experiment Project, said that the stainless steel reticulated shell carries 35.4m diameter polymethyl methacrylate balls, 20000 tons of liquid scintillators, 20000 20 inch photomultiplier tubes, 25000 3 inch photomultiplier tubes and many other detector components. The organic glass balls carried by stainless steel mesh shells have great potential. The organic glass ball is made of 263 12 centimeter thick baking and bending ball panels and upper and lower chimneys bonded together, with a net weight of about 600 tons, making it the world's largest single organic glass ball. What does 12 centimeters thick mean? Compared to its diameter of 35.4 meters, a 12 centimeter thick organic glass ball is as thin as an eggshell when converted proportionally, "said Cao Jun. After the main body of the Jiangmen Neutrino Experiment detector is completed, it will enter the stage of filling ultrapure water and liquid scintillators. The Jiangmen Neutrino Experiment will run for data collection in August 2025 and is expected to run for about 30 years. Understanding and studying neutrinos through the Jiangmen Neutrino Experiment is of profound significance for fundamental scientific fields such as particle physics, astrophysics, and cosmology Wang Yifang, director of the Institute of High Energy Physics of the Chinese Academy of Sciences and chief scientist of the Jiangmen Neutrino Experiment, said. (New Society)
Edit：Momo Responsible editor：Chen Zhaozhao
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