EVOLUTION OF HIGH-ENERGY PARTICLE DISTRIBUTION IN MATURE SHELL-TYPE SUPERNOVA REMNANTS

Strategic Priority Research Program, of the Chinese Academy of Sciences [XDB09000000]; Emergence of Cosmological Structures, of the Chinese Academy of Sciences [XDB09000000]; Key Laboratory of Particle Astrophysics of Yunnan Province [2015DG035]; NSFC [11173064, 11233001, 11233008]; National Natural Science Foundation of China (NSFC) [11433004]