A Cosmic-Ray Propagation Model based on Measured Nuclei Spectra
August 14, 2023
The cosmic-ray nuclei spectra feature breaks in their power-law shapes, with slight differences in the indices and in the break positions between the nuclei species. A model explaining these structural differences as propagation effects is presented, based on the hypothesis that the source spectrum from acceleration in supernova remnants is a common broken power law with exponential cut-off for all nuclei species. The observed structural differences in the spectra are instead attributed to soft breaks in the power-law rigidity dependence of the diffusion coefficient, as well as a spatial variation of the diffusion coefficient within the galaxy. Using a modified version of the numerical cosmic-ray propagation calculation code DRAGON and optimizing the model’s input parameters in a random walk, it is shown that such a model can, within experimental uncertainty, explain various nuclei spectra and primary-secondary ratios measurements by the ISS-based experiments CALET (Calorimetric Electron Telescope) and AMS-02 (Alpha Magnetic Spectrometer), as well as the CRS (Cosmic Ray Subsystem) on the Voyager space-probes.
How to cite
Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating
very compact bibliographies which can be beneficial to authors and
readers, and in "proceeding" format
which is more detailed and complete.