Effects of reacceleration and source grammage on secondary cosmic rays spectra

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.

arXiv comment11 pages, 9 figures, submitted to MNRAS

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Cited by in corpus (14)

• AMS-02 beryllium data and its implication for cosmic ray transport
• Detection of spectral hardenings in cosmic-ray boron-to-carbon and boron-to-oxygen flux ratios with DAMPE
• Reconciling cosmic-ray transport theory with phenomenological models motivated by Milky-Way data
• Cosmic-ray Boron Flux Measured from 8.4 GeV$/n$ to 3.8 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station
• On particle acceleration and transport in plasmas in the Galaxy: theory and observations
• Cosmic-ray generated bubbles around their sources
• Interpretations of the cosmic ray secondary-to-primary ratios measured by DAMPE
• Intermediate mass and heavy Galactic cosmic-ray nuclei: the case of new AMS-02 measurements
• Gamma rays from reaccelerated particles at supernova remnant shocks
• On the origin of the spectral features observed in the cosmic ray spectrum
• Impact of transport modelling on the ${}^{60}$Fe abundance inside Galactic cosmic ray sources
• Origin of Spectral Hardening of Secondary Cosmic-Ray Nuclei
• The Origin of the Very-High-Energy Diffuse $\gamma$-Ray Emission: The Case for Galactic Source Cocoons
• Precision spectral measurements of Chromium and Titanium from 10 to 250 GeV$/n$ and sub-Iron to Iron ratio with the Calorimetric Electron Telescope on the ISS