Origin of hardening and universality of cosmic rays spectra in GV–PV rigidity region

Abstract

Recent balloon-borne and satellite experiments have established new features in the behavior of the spectra of cosmic rays. An analysis of all the data showed that hardening of most abundant primary cosmic ray nuclei spectra with increasing rigidity is observed in > 200 GV region. At the same time, rigidity dependences of secondary cosmic rays are distinctly different. The AMS-02 data show that above 200 GV the secondary cosmic rays Li, Be, B harden more than the primary He, C, O.In this paper we discuss a new scenario that self-consistently describes these new features of the cosmic ray spectra. We demonstrate that the measured by the AMS-02 changes in the slope of the cosmic ray spectra caused by the transition from the contribution of multiple distant Galactic sources, including the nuclear interactions of the particles accelerated by these sources with an interstellar medium during their wandering in the Galaxy, to the contribution of mainly local ones. We also found that the spectral universality is observed at rigidity R > 10 5 GV.

Fast and accurate AMS-02 antiproton likelihoods for global dark matter fits

“…Understanding this difference is subject to current research. Possible explanations are, for example, different source populations [97][98][99] or a Z/A-dependence of efficiency of Fermi-shock acceleration [100,101]. The diffusion coefficient is modeled as a single broken power law with the break R D,1 around 300 GV (i.e.…”

An overview of CALET observations after three years on the International Space Station

“…According to some models (e.g. [38,39]) a flux reduction for protons and helium might be expected at rigidities as low as tens of TV. Therefore, precise direct observation of proton and helium spectra in the multi-TeV energy region are of extreme interest.…”

Measurement of the Proton Spectrum with CALET on the ISS

“…According to some models (e.g. [32,33]) a flux reduction for protons and helium might be expected at rigidities as low as tens of TV. Therefore, precise direct observation of proton and helium spectra in the multi-TeV energy region are of extreme interest.…”