Effects of reacceleration and source grammage on secondary cosmic rays spectra
Date Issued
2019
Author(s)
Abstract
The ratio between secondary and primary cosmic ray particles is the main
source of information about cosmic ray propagation in the Galaxy. Primary
cosmic rays are thought to be accelerated mainly in Supernova Remnant (SNR)
shocks and then released in the interstellar medium (ISM). Here they produce
secondary particles by occasional collisions with interstellar matter. As a
result, the ratio between the fluxes of secondary and primary particles carries
information about the amount of matter cosmic rays have encountered during
their journey from their sources to Earth. Recent measurements by AMS-02
revealed an unexpected behaviour of two main secondary-to-primary ratios, the
Boron-to-Carbon ratio and the anti-proton-to-proton ratio. In this work we
discuss how such anomalies may reflect the action of two phenomena that are
usually overlooked, namely the fact that some fraction of secondary particles
can be produced within the acceleration region, and the non-negligible
probability that secondary particles encounter an accelerator (and are
reaccelerated) during propagation. Both effects must be taken into account in
order to correctly extract information about CR transport from
secondary-to-primary ratios.
Volume
488
Issue
2
Start page
2068
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.488.2068B
Rights
open.access
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