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Propagation of cosmic rays in the AMS-02 era
Yuan, Qiang1,2; Lin, Su-Jie3; Fang, Kun3; Bi, Xiao-Jun3
2017-04-19
Source PublicationPHYSICAL REVIEW D
ISSN2470-0010
Volume95Issue:8Pages:16
Corresponding AuthorYuan, Qiang(yuanq@pmo.ac.cn) ; Bi, Xiao-Jun(bixj@ihep.ac.cn)
AbstractIn 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.
DOI10.1103/PhysRevD.95.083007
WOS KeywordMONTE-CARLO TECHNIQUE ; SOLAR MODULATION ; ENERGY-SPECTRA ; INTERSTELLAR-MEDIUM ; SUPERNOVA-REMNANTS ; BAYESIAN-ANALYSIS ; SOURCE PARAMETERS ; SAMPLE TRANSPORT ; DIFFUSION-MODEL ; NUCLEI
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000399806900003
PublisherAMER PHYSICAL SOC
Citation statistics
Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22860
Collection中国科学院紫金山天文台
Corresponding AuthorYuan, Qiang; Bi, Xiao-Jun
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
3.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
Recommended Citation
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):16.
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),16.
MLA Yuan, Qiang,et al."Propagation of cosmic rays in the AMS-02 era".PHYSICAL REVIEW D 95.8(2017):16.
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