Abstract
Particle spectra and mass composition in the ultra-high energy region in the framework of the Galactic origin of cosmic rays
Highlights
Physical mechanisms governing the features of energy spectra of cosmic rays (CRs) and their composition variations in the energy range that spans from PeV to tens of EeV are still under debate
In the framework of the model described above we have analysed the energy spectra and mass composition behaviour in the energy range up to the cut-off observed at ∼ 5 · 1019 eV
If anomalous diffusion is, the main mechanism of the knee feature, the injection spectra exponent could be estimated from the analysis of the experimentally measured energy spectra around the knee
Summary
Physical mechanisms governing the features of energy spectra of cosmic rays (CRs) and their composition variations in the energy range that spans from PeV to tens of EeV are still under debate. The so-called standard scenario assumes that the Galactic component of CRs accelerated by supernova remnants extends up to energies of a few 1017 eV with gradually heavier composition due to the rigidity-dependent maximum acceleration energy of nuclei. The non-GZK origin of the energy spectrum suppression at the highest energies (e.g., the acceleration limits in Galactic cosmic ray sources above 1018 eV) can not be excluded. In the present paper we revise the possibility of the self-consistent description of the CRs energy spectra and composition results within the Galactic cosmic ray origin scenario based on the anomalous diffusion model and discuss the crucial model predictions, which could be verified with improved high-precision measurements in the near future
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