Evidence of fresh cosmic ray in galactic plane based on DAMPE measurement of B/C and B/O ratios

Abstract

More and more experiments have identified that the energy spectra of both primary and secondary cosmic-rays exhibit a hardening above $\sim 200$ GV. Most recently, the DAMPE experiment has reported a hardening of boron-to-carbon ratio at $200$ GV. These signs call for modifications of the conventional cosmic-ray (CR) picture. In this work, we propose that the plethoric secondary cosmic rays, for example, boron, antiprotons, originate from the hadronic interactions of freshly accelerated cosmic rays with the interstellar gas near the sources. We find that secondary-to-primary ratios, for example, boron-to-carbon, boron-to-oxygen and antiproton-to-proton ratios, could be well described. The measurements of electrons and positrons could also be accounted for.

13 pages, 4 figures, published in JCAP

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Cited by in corpus (5)

• Interpretations of the cosmic ray secondary-to-primary ratios measured by DAMPE
• Galactic diffuse emission from radio to ultra-high-energy gamma rays in light of up-to-date cosmic ray measurements
• Potential of Constraining Propagation Parameters of Galactic Cosmic Rays with the High Energy cosmic-Radiation Detection facility onboard China's Space Station
• Direct measurements of cosmic rays and their possible interpretations
• Cosmic-ray deuteron excess from a primary component