AI Article Synopsis
- Knowledge of the boron to carbon (B/C) flux ratio is crucial for understanding cosmic ray propagation.
- A precise measurement of this ratio was made from 1.9 GV to 2.6 TV using data from 2.3 million boron and 8.3 million carbon nuclei collected by AMS over 5 years.
- The findings indicate that the B/C ratio does not demonstrate significant structures at high rigidities, and above 65 GV, it follows a single power law closely aligning with Kolmogorov's turbulence theory.
Article Abstract
Knowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important in understanding the propagation of cosmic rays. The precise measurement of the B/C ratio from 1.9 GV to 2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 years of operation, is presented. The detailed variation with rigidity of the B/C spectral index is reported for the first time. The B/C ratio does not show any significant structures in contrast to many cosmic ray models that require such structures at high rigidities. Remarkably, above 65 GV, the B/C ratio is well described by a single power law R^{Δ} with index Δ=-0.333±0.014(fit)±0.005(syst), in good agreement with the Kolmogorov theory of turbulence which predicts Δ=-1/3 asymptotically.
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| http://dx.doi.org/10.1103/PhysRevLett.117.231102 | DOI Listing |
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