Spectrum and fraction of cosmic ray positrons: results of the anomalous diffusion approach

24th European Cosmic Ray Symposium

Volkov, Nikolay^1 ; Lagutin, Anatoly^1 ; Tyumentsev, Alexander^1

Altai State University, Radiophysics and Theoretical Physics Department, Lenin ave., 61, Barnaul

656049, Russia^1

关键词: Anomalous diffusion;    Anomalous diffusion model;    Cosmic ray electrons;    Different origins;    Interstellar mediums;    Russian Academy of Sciences;    Self-consistent description;    Spectral indices;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/632/1/012027/pdf
DOI  :  10.1088/1742-6596/632/1/012027

来源: IOP

【 摘 要 】

We present the results of new calculations of the energy spectra of cosmic ray electrons, positrons and also positron fraction under assumption that both electrons and positrons are generated by the same Galactic sources, which accelerate particles with same power-law injection spectral index p. The value of the injection index p ≈ 2.85 retrieved in our works from the analysis of the observed CR spectra has been used. The propagation of particles through the highly non-homogeneous interstellar medium has been described by the anomalous diffusion model. We show that proposed approach allows the self-consistent description of the recent AMS-02 data. In contrast to the conclusion made by AMS-02 collaboration about the different origin of the high-energy positrons and electrons, our results demonstrate that the differing behavior of spectral indices of electrons and positrons with energy can be described under the assumption that both positrons and electrons have common Galactic sources. Our prediction (Lagutin et al. Bull. Russian Academy of Sciences. Physics, 2013, Vol. 77, No. 11, p. 1312) that the e+to total e-+ e+ratio reaches a constant value for E200 GeV is confirmed.