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Indications for a High-Rigidity Break in the Cosmic-Ray Diffusion Coefficient.

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Cosmic-ray boron to carbon ratio data supports diffusive propagation models for cosmic ray protons and helium nuclei. Further data may confirm this scenario, enhancing our understanding of cosmic ray origins.

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Area of Science:

  • Astrophysics
  • Cosmic Ray Physics
  • Particle Astrophysics

Background:

  • Cosmic rays exhibit broken power-law spectra, suggesting complex origins.
  • The boron to carbon ratio (B/C) is a key tracer for understanding cosmic ray propagation.

Purpose of the Study:

  • To investigate the origin of cosmic ray spectra using recent B/C data.
  • To determine if diffusive propagation models explain observed proton and helium nuclei spectra.

Main Methods:

  • Analysis of cosmic-ray boron to carbon ratio (B/C) data from the Ams-02 experiment.
  • Bayesian statistical analysis to evaluate model evidence.

Main Results:

  • Decisive Bayesian evidence favors diffusive propagation for proton and helium nuclei spectra.
  • The findings are robust against uncertainties in cross sections and primary boron presence.

Conclusions:

  • Diffusive propagation is strongly supported as the origin of broken power-law spectra for cosmic ray protons and helium.
  • Additional data on cosmic ray nuclei spectra (Carbon, Nitrogen, Oxygen, Lithium, Beryllium) could definitively confirm this propagation scenario.