Bayesian analysis of spatial-dependent cosmic-ray propagation: Astrophysical background of antiprotons and positrons

被引:87
作者
Feng, Jie [1 ,2 ]
Tomassetti, Nicola [3 ,4 ,5 ]
Oliva, Alberto [6 ]
机构
[1] Sun Yat Sen Univ, Sch Phys, Guangzhou 510275, Guangdong, Peoples R China
[2] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[3] Univ Perugia, I-06100 Perugia, Italy
[4] Ist Nazl Fis Nucl, I-06100 Perugia, Italy
[5] Univ Grenoble Alpes, LPSC, CNRS IN2P3, F-38026 Grenoble, France
[6] Ctr Invest Energet, Medioambientales Tecnol, E-28040 Madrid, Spain
关键词
ISOTOPIC COMPOSITION; SUPERNOVA-REMNANTS; CROSS-SECTIONS; ORIGIN; ABUNDANCE; NUCLEI; SPECTRUM; PROTONS; AGE; CONSTRAINTS;
D O I
10.1103/PhysRevD.94.123007
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The AMS-02 experiment has reported a new measurement of the antiproton/ proton ratio in Galactic cosmic rays (CRs). In the energy range E similar to 60-450 GeV, this ratio is found to be remarkably constant. Using recent data on CR proton, helium, and carbon fluxes, Be-10/Be-9 and B/C ratios, we have performed a global Bayesian analysis based on a Markov chain Monte Carlo sampling algorithm under a "two halo model" of CR propagation. In this model, CRs are allowed to experience a different type of diffusion when they propagate in the region close to the Galactic disk. We found that the vertical extent of this region is about 900 pc above and below the disk, and the corresponding diffusion coefficient scales with energy as D proportional to E-0.15, describing well the observations on primary CR spectra, secondary/primary ratios, and anisotropy. Under this model, we have carried out improved calculations of antiparticle spectra arising from secondary CR production and their corresponding uncertainties. We made use of Monte Carlo generators and accelerator data to assess the antiproton production cross sections and their uncertainties. While the positron excess requires the contribution of additional unknown sources, we found that the new AMS-02 antiproton data are consistent, within the estimated uncertainties, with our calculations based on secondary production.
引用
收藏
页码:1 / 18
页数:18
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