Spatial-dependent Propagation of Cosmic Rays Results in the Spectrum of Proton, Ratios of P/P, and B/C, and Anisotropy of Nuclei
Spatial-dependent Propagation of Cosmic Rays Results in the Spectrum of Proton, Ratios of P/P, and B/C, and Anisotropy of Nuclei
复制标题
宇宙射线的空间相关传播导致质子光谱、P/P 和 B/C 比率以及原子核的各向异性
DOI：
10.3847/0004-637x/819/1/54
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Chao Jin
中科院分区：
文献类型：
--
作者：
Yi-Qing Guo;Zhen Tian;Chao Jin
Recent precise measurements of cosmic ray spectra revealed an anomalous hardening at ∼200 GV, observed by the ATIC, CREAM, PAMELA, and AMS02 experiments. Particularly, the latest observation of the p p ratio by AMS02 demonstrated a flat distribution, which further validated the spectral anomalies of secondary particles. All those new phenomena indicated that the conventional propagation model of cosmic rays meets a challenge. In this.work, the spatial-dependent diffusion coefficient D( ) rzp , , is employed by tracing the source distribution under the physical picture of the two-halo model in the DRAGON package. Under such a scenario, the model calculation will result in two-component spectra for primary nuclei. Due to the smaller rigidity dependence of D( ) rzp , in the galactic disk, the ratios secondary-to-primary will inevitably be flatter and the expected anisotropy of cosmic rays.will be much more attenuated than in the conventional model. As a result, we can reproduce the spectral hardening of protons, the flat ratios of p p and B/C, and consistent anisotropy from ∼100 GeV to ∼100 TeV by only adopting one set of spatial-dependent diffusion coefficients D( ) rzp , , in a galactic disk.
