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Article ; Online: Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A.

Cao, Zhen / Aharonian, F / Axikegu / Bai, Y X / Bao, Y W / Bastieri, D / Bi, X J / Bi, Y J / Bian, W / Bukevich, A V / Cao, Q / Cao, W Y / Cao, Zhe / Chang, J / Chang, J F / Chen, A M / Chen, E S / Chen, H X / Chen, Liang /
Chen, Lin / Chen, Long / Chen, M J / Chen, M L / Chen, Q H / Chen, S / Chen, S H / Chen, S Z / Chen, T L / Chen, Y / Cheng, N / Cheng, Y D / Cui, M Y / Cui, S W / Cui, X H / Cui, Y D / Dai, B Z / Dai, H L / Dai, Z G / Danzengluobu / Dong, X Q / Duan, K K / Fan, J H / Fan, Y Z / Fang, J / Fang, J H / Fang, K / Feng, C F / Feng, H / Feng, L / Feng, S H / Feng, X T / Feng, Y / Feng, Y L / Gabici, S / Gao, B / Gao, C D / Gao, Q / Gao, W / Gao, W K / Ge, M M / Geng, L S / Giacinti, G / Gong, G H / Gou, Q B / Gu, M H / Guo, F L / Guo, X L / Guo, Y Q / Guo, Y Y / Han, Y A / Hasan, M / He, H H / He, H N / He, J Y / He, Y / Hor, Y K / Hou, B W / Hou, C / Hou, X / Hu, H B / Hu, Q / Hu, S C / Huang, D H / Huang, T Q / Huang, W J / Huang, X T / Huang, X Y / Huang, Y / Ji, X L / Jia, H Y / Jia, K / Jiang, K / Jiang, X W / Jiang, Z J / Jin, M / Kang, M M / Karpikov, I / Kuleshov, D / Kurinov, K / Li, B B / Li, C M / Li, Cheng / Li, Cong / Li, D / Li, F / Li, H B / Li, H C / Li, Jian / Li, Jie / Li, K / Li, S D / Li, W L / Li, X R / Li, Xin / Li, Y Z / Li, Zhe / Li, Zhuo / Liang, E W / Liang, Y F / Lin, S J / Liu, B / Liu, C / Liu, D / Liu, D B / Liu, H / Liu, H D / Liu, J / Liu, J L / Liu, M Y / Liu, R Y / Liu, S M / Liu, W / Liu, Y / Liu, Y N / Luo, Q / Luo, Y / Lv, H K / Ma, B Q / Ma, L L / Ma, X H / Mao, J R / Min, Z / Mitthumsiri, W / Mu, H J / Nan, Y C / Neronov, A / Ou, L J / Pattarakijwanich, P / Pei, Z Y / Qi, J C / Qi, M Y / Qiao, B Q / Qin, J J / Raza, A / Ruffolo, D / Sáiz, A / Saeed, M / Semikoz, D / Shao, L / Shchegolev, O / Sheng, X D / Shu, F W / Song, H C / Stenkin, Yu V / Stepanov, V / Su, Y / Sun, D X / Sun, Q N / Sun, X N / Sun, Z B / Takata, J / Tam, P H T / Tang, Q W / Tang, R / Tang, Z B / Tian, W W / Wang, C / Wang, C B / Wang, G W / Wang, H G / Wang, H H / Wang, J C / Wang, Kai / Wang, L P / Wang, L Y / Wang, P H / Wang, R / Wang, W / Wang, X G / Wang, X Y / Wang, Y / Wang, Y D / Wang, Y J / Wang, Z H / Wang, Z X / Wang, Zhen / Wang, Zheng / Wei, D M / Wei, J J / Wei, Y J / Wen, T / Wu, C Y / Wu, H R / Wu, Q W / Wu, S / Wu, X F / Wu, Y S / Xi, S Q / Xia, J / Xiang, G M / Xiao, D X / Xiao, G / Xin, Y L / Xing, Y / Xiong, D R / Xiong, Z / Xu, D L / Xu, R F / Xu, R X / Xu, W L / Xue, L / Yan, D H / Yan, J Z / Yan, T / Yang, C W / Yang, C Y / Yang, F / Yang, F F / Yang, L L / Yang, M J / Yang, R Z / Yang, W X / Yao, Y H / Yao, Z G / Yin, L Q / Yin, N / You, X H / You, Z Y / Yu, Y H / Yuan, Q / Yue, H / Zeng, H D / Zeng, T X / Zeng, W / Zha, M / Zhang, B B / Zhang, F / Zhang, H / Zhang, H M / Zhang, H Y / Zhang, J L / Zhang, Li / Zhang, P F / Zhang, P P / Zhang, R / Zhang, S B / Zhang, S R / Zhang, S S / Zhang, X / Zhang, X P / Zhang, Y F / Zhang, Yi / Zhang, Yong / Zhao, B / Zhao, J / Zhao, L / Zhao, L Z / Zhao, S P / Zhao, X H / Zheng, F / Zhong, W J / Zhou, B / Zhou, H / Zhou, J N / Zhou, M / Zhou, P / Zhou, R / Zhou, X X / Zhu, B Y / Zhu, C G / Zhu, F R / Zhu, H / Zhu, K J / Zou, Y C / Zuo, X

Physical review letters

2024  Volume 132, Issue 13, Page(s) 131002

Abstract: We present the measurements of all-particle energy spectrum and mean logarithmic mass of cosmic rays in the energy range of 0.3-30 PeV using data collected from LHAASO-KM2A between September 2021 and December 2022, which is based on a nearly composition- ... ...

Abstract We present the measurements of all-particle energy spectrum and mean logarithmic mass of cosmic rays in the energy range of 0.3-30 PeV using data collected from LHAASO-KM2A between September 2021 and December 2022, which is based on a nearly composition-independent energy reconstruction method, achieving unprecedented accuracy. Our analysis reveals the position of the knee at 3.67±0.05±0.15  PeV. Below the knee, the spectral index is found to be -2.7413±0.0004±0.0050, while above the knee, it is -3.128±0.005±0.027, with the sharpness of the transition measured with a statistical error of 2%. The mean logarithmic mass of cosmic rays is almost heavier than helium in the whole measured energy range. It decreases from 1.7 at 0.3 PeV to 1.3 at 3 PeV, representing a 24% decline following a power law with an index of -0.1200±0.0003±0.0341. This is equivalent to an increase in abundance of light components. Above the knee, the mean logarithmic mass exhibits a power law trend towards heavier components, which is reversal to the behavior observed in the all-particle energy spectrum. Additionally, the knee position and the change in power-law index are approximately the same. These findings suggest that the knee observed in the all-particle spectrum corresponds to the knee of the light component, rather than the medium-heavy components.
Language English
Publishing date 2024-04-13
Publishing country United States
Document type Journal Article
ZDB-ID 208853-8
ISSN 1079-7114 ; 0031-9007
ISSN (online) 1079-7114
ISSN 0031-9007
DOI 10.1103/PhysRevLett.132.131002
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