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Cosmic ray photons have been detected

On May 17, it was learned from a press conference jointly held by the Institute of High Energy Physics of the Chinese Academy of Sciences and Springer Nature that the major national science and technology infrastructure "High Altitude Cosmic Ray Observatory (LHAASO)" is in the Milky Way Galaxy. The first batch of ultra-high-energy cosmic accelerators was discovered within, and photons with energy per (1015 electron volts) were detected. This is the highest-energy photon detected by humans so far, breaking through the traditional human perception of the acceleration of ultra-high-energy particles in the Milky Way. The era of ultra-high energy gamma astronomy. These findings are published online today in "Nature".


Bird's-eye view of LHASSO Cosmic Ray Detection Observatory

The study of cosmic rays occupies an important position in the development of modern physics. The core issue of current cosmic ray physics is to find the origin of cosmic rays, reveal their acceleration and propagation mechanisms, and use them as probes to study basic issues related to the evolution of the universe and the evolution of high-energy celestial bodies. This is a major frontier of physics and astronomy today. The high-altitude cosmic ray observatory project is a major national scientific and technological infrastructure currently under construction in my country. It is located in Haizi Mountain, Daocheng County, Sichuan Province at an altitude of 4410 meters. It covers an area of 1.36 square kilometers. The core scientific goal is to solve the mystery of high-energy cosmic rays. , To promote the development of ultra-high energy gamma-ray astronomy.

This result is one of the first scientific discoveries made by LHAASO during its construction period, and it was completed by the LHAASO International Cooperation Group led by the Institute of High Energy Physics, Chinese Academy of Sciences. The astrophysics team of Guangxi University became a member of the cooperation group in June 2019 and participated in related research work. It was responsible for conducting optical observations of high-energy explosions detected by LHAASO, and was responsible for organizing and conducting radiation physics research on high-energy radiation sources outside the Milky Way. . This is another major participation since our school's astrophysics team participated in the use of the national major scientific and technological infrastructure of the 500-meter-aperture radio telescope FAST to achieve a breakthrough in the study of cosmic fast radio bursts (listed in the top ten international scientific and technological progress in 2020) at the end of last year. Results.

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