On the knee of Galactic cosmic rays in light of sub-TeV spectral hardenings
文献类型：期刊论文
| 作者 | Yuan, Q ; Guo, YQ; Guo YQ(郭义庆)
|
| 刊名 | CHINESE PHYSICS C
 |
| 出版日期 | 2018 |
| 卷号 | 42期号:7页码:75103 |
| 关键词 | cosmic ray knee spectrum propagation |
| ISSN号 | 1674-1137 |
| DOI | 10.1088/1674-1137/42/7/075103 |
| 文献子类 | Article |
| 英文摘要 | More than fifty years after the discovery of the knee in the cosmic ray (CR) spectra, its physical origin remains a mystery. This is partly due to the ambiguity of the energy spectra of individual components. Recently, direct measurements from several space experiments found significant spectral hardenings of CR nuclei at similar to 200 GV. A joint modeling of the direct and indirect measurements may help to understand the experimental systematics and the physics of the knee. In this work, we update the phenomenological "poly-gonato" model to include the spectral hardenings, with a changing spectral index of gamma+beta.logE. This modification gives a reasonable description of the CR spectra in a wide energy range. However, the fits to different data sets give different results. We find that the fit to the AMS-02 and CREAM data slightly favors a relatively low energy knee of the light components. In such a case, the expected all-particle spectra under-shoot the data, which may require an extra component of CRs. The fits to AMS-02 data and the light component (H+He) data from the Tibet AS gamma/ARGO-YBJ/WFCTA and KASCADE experiments give consistent results with the all-particle spectra. We further propose a possible physical realization of such a "modified poly-gonato" model of spectral hardenings by means of spatially-dependent diffusion of CRs. We find reasonably good agreement between the model predictions and the data for CR spectra, the secondary-to-primary ratios, and the amplitude of anisotropies. |
| 电子版国际标准刊号 | 2058-6132 |
| WOS关键词 | ENERGY-SPECTRUM ; MAXIMUM ENERGY ; SUPERNOVA-REMNANTS ; ANISOTROPY ; NUCLEI ; COMPONENT ; SHOCKS ; REACCELERATION ; PROPAGATION ; ICECUBE |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| CSCD记录号 | CSCD:6267452 |
| WOS记录号 | WOS:000436109700016 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286062]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Yuan, Q,Guo, YQ,Guo YQ. On the knee of Galactic cosmic rays in light of sub-TeV spectral hardenings[J]. CHINESE PHYSICS C,2018,42(7):75103. |
| APA | Yuan, Q,Guo, YQ,&郭义庆.(2018).On the knee of Galactic cosmic rays in light of sub-TeV spectral hardenings.CHINESE PHYSICS C,42(7),75103. |
| MLA | Yuan, Q,et al."On the knee of Galactic cosmic rays in light of sub-TeV spectral hardenings".CHINESE PHYSICS C 42.7(2018):75103. |
入库方式： OAI收割
来源：高能物理研究所
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