To the interpretation of the upturn observed by ATIC in heavy nuclei to iron ratios

TL;DR

This paper proposes that the upturn in heavy nuclei to iron ratios observed by ATIC can be explained by a closed galaxy model with embedded cosmic ray sources, predicting a universal upturn near 200-300 GeV/n and a source spectral index around 2.5.

Contribution

It introduces a closed galaxy model with local sources to interpret the ATIC heavy nuclei data, predicting a universal spectral upturn and specific source spectral index.

Findings

Upturn in heavy nuclei to iron ratios explained by the model.

Model predicts a universal upturn near 200-300 GeV/n.

Source spectral index estimated to be around 2.5.

Abstract

It is argued that the upturn observed in heavy nuclei to iron ratios as measured in the ATIC experiment could be understood within the model of closed galaxy with embedded local regions containing the sources of CR (Peters, Westergaard, 1977). The universal upturn near the energies of 200-300 GeV/n in the spectra of abundant primary nuclei is also predicted by this model, but it also predicts the source spectral index to be near 2.5.