中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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
DOI10.1088/1674-1137/42/7/075103
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
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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.

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来源:高能物理研究所

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