Structures in the cosmic ray energy spectra
Abstract
All the components of cosmic rays have 'structure' in their energy spectra at some level, ie deviations from a simple power law, and their examination is relevant to the origin of the particles. Emphasis, here, is placed on the large-scale structures in the spectra of nuclei (the 'knee' at about 3 PeV), that of electrons and positrons (a shallow 'upturn' at about 100 GeV) and the positron to electron plus positron ratio (an upturn starting at about 5 GeV). Fine structure is defined as deviations from the smooth spectra which already allow for the large-scale structure. Search for the fine structure has been performed in the precise data on positron to electron plus positron ratio measured by the AMS-02 experiment. Although no fine structure is indicated, it could in fact be present at the few percent level.
Cite
@article{arxiv.1310.3076,
title = {Structures in the cosmic ray energy spectra},
author = {Anatoly Erlykin and Arnold Wolfendale},
journal= {arXiv preprint arXiv:1310.3076},
year = {2015}
}
Comments
8 pages, 2 figures, accepted for publication in Astroparticle Physics