China News Agency, Lhasa, March 2 (Reporter Gongsanglam) The official Tibetan media released a news on the 2nd. Recently, the Sino-Japanese cooperative team used the ASγ experimental array in Yangbajing, Tibet, China to discover for the first time in the world that it is 2600 light-years from the earth. The supernova remnant SNR G106.3+2.7 emits gamma rays of more than 100 trillion electron volts.
Sources say that these gamma rays may have been produced by the collision of cosmic rays accelerated to PeV by the shock wave in the supernova remnant and a nearby molecular cloud.
The supernova remnant has therefore become a candidate for the "PeVatron" (PeVatron) in the Milky Way, opening an important window for solving the mystery of the origin of ultra-high-energy cosmic rays.
The Tibet China-Japan Cooperation ASγ Experiment is located in Yangbajing Town, Lhasa City, Tibet, at an altitude of 4,300 meters. It was built in 1989.
It was jointly initiated by the Institute of High Energy Physics of the Chinese Academy of Sciences and the Universe Ray Institute of the University of Tokyo, and has been operating in cooperation to this day.
In 2014, the China-Japan cooperative ASγ experimental team added an innovative underground muzi water Cherenkov probe underground to the original cosmic ray surface array.
Comprehensive utilization of the data from surface and underground detector arrays can eliminate 99.92% of cosmic ray background noise, thereby greatly improving the sensitivity of detecting gamma rays.
This time, the Sino-Japanese cooperation team measured ultra-high-energy gamma rays exceeding 100 trillion electron volts from the direction of the supernova remnants mentioned above through observations with an effective time of 2 years.
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