Interpretations of the cosmic ray secondary-to-primary ratios measured by DAMPE

Abstract

Precise measurements of the boron-to-carbon and boron-to-oxygen ratios by DAMPE show clear hardenings around 100 GeV/n, which provide important implications on the production, propagation, and interaction of Galactic cosmic rays. In this work we investigate a number of models proposed in literature in light of the DAMPE findings. These models can roughly be classified into two classes, driven by propagation effects or by source ones. Among these models discussed, we find that the re-acceleration of cosmic rays, during their propagation, by random magnetohydrodynamic waves may not reproduce sufficient hardenings of B/C and B/O, and an additional spectral break of the diffusion coefficient is required. The other models can properly explain the hardenings of the ratios. However, depending on simplifications assumed, the models differ in their quality in reproducing the data in a wide energy range. The models with significant re-acceleration effect will under-predict low-energy antiprotons but over-predict low-energy positrons, and the models with secondary production at sources over-predict high-energy antiprotons. For all models high-energy positron excess exists.

Graphical abstract

Keywords

cosmic rays / propagation

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (No. 2021YFA0718404), the National Natural Science Foundation of China (Nos. 12220101003 and 12103094), and the Project for Young Scientists in Basic Research of Chinese Academy of Sciences (No. YSBR-061). The calculation was partially done on the Cosmology Simulation Database (CSD) of the National Basic Science Data Center (NBSDC-DB-10).

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