Bayesian analysis of cosmic-ray propagation parameters: secondary antiparticles from spatial-dependent diffusion models
Abstract
The antiparticle energy spectra of Galactic cosmic rays (CRs) have several exciting features such as the unexpected positron excess at 10-200\,GeV and the remarkably hard antiproton flux at \,60--450\,GeV recently measured by the \AMS{} experiment. In this paper, we report calculations of antiparticle CR spectra arising from secondary production and their corresponding uncertainties. Using the most recent data on CR protons, helium, carbon, and nuclear ratios Be/Be and B/C, we have performed a global Bayesian analysis, based on a Markov Chain Monte Carlo sampling algorithm, under a scenario of spatial-dependent CR diffusion in the Galaxy which reproduces well the observed spectral hardening in the CR hadron fluxes. While the high-energy positron excess requires the contribution of additional unknown sources, we found that the antiproton data are consistent within the estimated uncertainties, with our predictions based on secondary production.
Cite
@article{arxiv.1612.08520,
title = {Bayesian analysis of cosmic-ray propagation parameters: secondary antiparticles from spatial-dependent diffusion models},
author = {Jie Feng and Nicola Tomassetti and Alberto Oliva},
journal= {arXiv preprint arXiv:1612.08520},
year = {2018}
}
Comments
XXV ECRS 2016 Proceedings - eConf C16-09-04.3