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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

CollaborationWith : Azzarello, Philipp / Bourquin, Maurice / Cadoux, Franck / Leluc, Catherine / Li, Yang / Paniccia, Mercedes / Pohl, Martin / Rapin, Divic Jean / Saouter, Pierre / Vitillo, Stefania / Wu, Xin
Published in Physical Review Letters. 2016, vol. 117, no. 23, p. 231102
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 RΔ 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.
Keywords Cosmic raysBoron to carbon ratioBoronCarbonCosmic-ray propagationSpace missionsAMS
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AMS COLLABORATION. 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. In: Physical Review Letters, 2016, vol. 117, n° 23, p. 231102. https://archive-ouverte.unige.ch/unige:98559

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Deposited on : 2017-11-06

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