Elemental Spectral Index Variations in Cosmic Rays
Published:Dec 25, 2025 13:38
•1 min read
•ArXiv
Analysis
This paper investigates discrepancies between theoretical predictions and observed cosmic ray energy spectra. It focuses on the spectral indices of different elements, finding variations that contradict the standard shock acceleration model. The study uses observational data from AMS-02 and DAMPE, and proposes a Spatially Dependent Propagation (SDP) model to explain the observed correlations between spectral indices and atomic/mass numbers. The paper highlights the need for further observations and theoretical models to fully understand these variations.
Key Takeaways
- •Observed cosmic ray energy spectra deviate from standard shock acceleration model predictions.
- •Spectral indices of cosmic ray elements vary, correlated with atomic and mass numbers.
- •The study uses AMS-02 and DAMPE data and proposes an SDP model.
- •Future observations and theoretical models are needed to explain the observed variations.
Reference
“Spectral indices show significant positive correlations with both atomic number Z and mass number A, likely due to A or Z-dependent fragmentation cross-sections.”