Propagation of cosmic rays in the AMS-02 era

	Propagation of cosmic rays in the AMS-02 era
	Yuan, Qiang; Lin, Su-Jie; Fang, Kun; Bi, Xiao-Jun
刊名	PHYSICAL REVIEW D
	2017
卷号	95 期号:8 页码:83007-
英文摘要	In this work we use the newly reported boron-to-carbon ratio (B/C) from AMS-02 and the time-dependent proton fluxes from PAMELA and AMS-02 to constrain the source and propagation parameters of cosmic rays in the Milky Way. A linear correlation of the solar modulation parameter with solar activities is assumed to account for the time-varying cosmic ray fluxes. A comprehensive set of propagation models, with or without reacceleration or convection, has been discussed and compared. We find that only the models with reacceleration can self-consistently fit both the proton and B/C data. The rigidity dependence slope of the diffusion coefficient, delta, is found to be about 0.38-0.50 for the diffusion-reacceleration models. The plain diffusion and diffusion-convection models fit the data poorly. We compare different model predictions of the positron and antiprotonfluxes with the data. We find that the diffusion-reacceleration models overproduce low energy positrons, while nonreacceleration models give better fit to the data. As for antiprotons, reacceleration models tend to underpredict low energy antiproton fluxes, unless a phenomenological modification of the velocity dependence of the diffusion coefficient is applied. Our results suggest that there could be important differences of the propagation for nuclei and leptons, in either the Milky Way or the solar heliosphere.
语种	英语
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/17325]
专题	中国科学院紫金山天文台
推荐引用方式 GB/T 7714	Yuan, Qiang,Lin, Su-Jie,Fang, Kun,et al. Propagation of cosmic rays in the AMS-02 era[J]. PHYSICAL REVIEW D,2017,95(8):83007-.
APA	Yuan, Qiang,Lin, Su-Jie,Fang, Kun,&Bi, Xiao-Jun.(2017).Propagation of cosmic rays in the AMS-02 era.PHYSICAL REVIEW D,95(8),83007-.
MLA	Yuan, Qiang,et al."Propagation of cosmic rays in the AMS-02 era".PHYSICAL REVIEW D 95.8(2017):83007-.