Inhomogeneous diffusion model for recent data on high-energy cosmic rays

TL;DR

This paper introduces a diffusion model with latitudinal variations to explain recent high-energy cosmic ray data, emphasizing the importance of precise measurements of light nuclei for testing propagation theories.

Contribution

The paper proposes a novel inhomogeneous diffusion model that incorporates latitudinal variations, advancing the understanding of cosmic ray propagation in the Galactic halo.

Findings

Model fits high-energy CR data well

High-precision light nuclei data are crucial for testing propagation models

Latitudinal variations significantly impact CR diffusion understanding

Abstract

The AMS Collaboration has recently released precision data on cosmic ray (CR) leptons and protons at high energies. Interesting progresses have also been made on the measurement of CR nuclei, such as the boron-to-carbon ratio or the lithium spectrum, up to TeV/nucleon energies. In order to provide a description these data, I consider a diffusion model of CR propagation which allows for latitudinal variations of the CR diffusion properties in the Galactic halo. I discuss the role of high-precision data on light CR nuclei in resolutely testing this model and the key propagation parameters.