Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A
文献类型：期刊论文
| 作者 | Cao, Zhen24,25,26; Aharonian, F.27,28; Axikegu29; Bai, Y. X.24,26; Bao, Y. W.30; Bastieri, D.31; Bi, X. J.24,25,26; Bi, Y. J.24,26; Bian, W.32; Bukevich, A. V.33 |
| 刊名 | Physical Review Letters
 |
| 出版日期 | 2024-03-29 |
| 卷号 | 132期号:13 |
| ISSN号 | 0031-9007 |
| 关键词 | Research Areas Cosmic ray composition & spectra Gravitation, Cosmology & Astrophysics |
| DOI | 10.1103/PhysRevLett.132.131002 |
| 产权排序 | 第25完成单位 |
| 文献子类 | Journal article (JA) |
| 英文摘要 | 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. © 2024 American Physical Society. |
| 学科主题 | 天文学 |
| URL标识 | 查看原文 |
| 资助项目 | N/A |
| 语种 | 英语 |
| 资助机构 | N/A |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/26755]  |
| 专题 | 星系类星体研究组 |
| 作者单位 | 1.University of Science and Technology of China, Anhui, Hefei, 230026, China; 2.State Key Laboratory of Particle Detection and Electronics, China; 3.Key Laboratory of Dark Matter and Space Astronomy and Key Laboratory of Radio Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Jiangsu, Nanjing, 210023, China; 4.Research Center for Astronomical Computing, Zhejiang Laboratory, Zhejiang, Hangzhou, 311121, China; 5.Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Guangxi, Nanning, 530004, China; 6.Department of Physics, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand; 7.Moscow Institute of Physics and Technology, Moscow, 141700, Russia; 8.Center for Relativistic Astrophysics and High Energy Physics, School of Physics and Materials Science, Institute of Space Science and Technology, Nanchang University, Jiangxi, Nanchang, 330031, China; 9.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China; 10.School of Physics, Huazhong University of Science and Technology, Hubei, Wuhan, 430074, China |
| 推荐引用方式 GB/T 7714 | Cao, Zhen,Aharonian, F.,Axikegu,et al. Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A[J]. Physical Review Letters,2024,132(13). |
| APA | Cao, Zhen.,Aharonian, F..,Axikegu.,Bai, Y. X..,Bao, Y. W..,...&Takata, J..(2024).Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A.Physical Review Letters,132(13). |
| MLA | Cao, Zhen,et al."Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A".Physical Review Letters 132.13(2024). |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。