PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Direct, CRD)
A Cosmic-Ray Propagation Model based on Measured Nuclei Spectra
H. Motz
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Pre-published on: August 14, 2023
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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.
DOI: https://doi.org/10.22323/1.444.0068
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