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International audienceKnowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important inunderstanding the propagation of cosmic rays. The precise measurement of the B=C ratio from 1.9 GV to2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 yearsof operation, is presented. The detailed variation with rigidity of the B=C spectral index is reported for thefirst time. The B=C ratio does not show any significant structures in contrast to many cosmic ray modelsthat require such structures at high rigidities. Remarkably, above 65 GV, the B=C ratio is well described bya single power law RΔ with index Δ ¼ −0.333 + 0.014ðfitÞ + 0.005ðsystÞ, in good agreement with theKolmogorov theory of turbulence which predicts Δ ¼ −1=3 asymptotically

physical review letters

Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station