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| DOI | 10.1103/PhysRevLett.132.131002 |
| Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A | |
| 发表日期 | 2024 |
| ISSN | 0031-9007 |
| EISSN | 1079-7114 |
| 起始页码 | 132 |
| 结束页码 | 13 |
| 卷号 | 132期号:13 |
| 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. |
| 语种 | 英语 |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Multidisciplinary |
| WOS记录号 | WOS:001202259300007 |
| 来源期刊 | PHYSICAL REVIEW LETTERS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/297668 |
| 作者单位 | Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Chinese Academy of Sciences; Institute of High Energy Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Dublin Institute for Advanced Studies; Max Planck Society; Southwest Jiaotong University; Southwest Jiaotong University; Nanjing University; Guangzhou University; Shanghai Jiao Tong University; Shanghai Jiao Tong University; Russian Academy of Sciences; Institute for Nuclear Research of the Russian Academy of Sciences; Hebei Normal University; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Chinese Academy of Sciences; Nanjing Institute of Astronomical Optics & Technology, NAOC, CAS; Purple Mountain Observatory, CAS; Chinese Academy of Sciences; Nanjing Institute of Astronomical Optics & Technology, NAOC, CAS; Purple Mountain Observatory, CAS; Zhejiang Laboratory; Chinese Academy of Sciences; Shangh... |
| 推荐引用方式 GB/T 7714 | . Measurements of All-Particle Energy Spectrum and Mean Logarithmic Mass of Cosmic Rays from 0.3 to 30 PeV with LHAASO-KM2A[J],2024,132(13). |
| APA | (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 | "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). |
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