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Precision Measurement of Cosmic-Ray Nitrogen and its Primary and Secondary Components with the Alpha Magnetic Spectrometer on the International Space Station

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Published in Physical Review Letters. 2018, vol. 121, no. 5, p. 051103
Abstract A precision measurement of the nitrogen flux with rigidity (momentum per unit charge) from 2.2 GV to 3.3 TV based on 2.2×10^6 events is presented. The detailed rigidity dependence of the nitrogen flux spectral index is presented for the first time. The spectral index rapidly hardens at high rigidities and becomes identical to the spectral indices of primary He, C, and O cosmic rays above ∼700  GV. We observed that the nitrogen flux ΦN can be presented as the sum of its primary component ΦPN and secondary component ΦSN, ΦN=ΦPN+ΦSN, and we found ΦN is well described by the weighted sum of the oxygen flux ΦO (primary cosmic rays) and the boron flux ΦB (secondary cosmic rays), with ΦPN=(0.090±0.002)×ΦO and ΦSN=(0.62±0.02)×ΦB over the entire rigidity range. This corresponds to a change of the contribution of the secondary cosmic ray component in the nitrogen flux from 70% at a few GV to <30% above 1 TV.
Keywords Galactic cosmic raysCosmic-ray nitrogenPrimary comsic-raysSecondary cosmic-raysAMS02
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AZZARELLO, Philipp et al. Precision Measurement of Cosmic-Ray Nitrogen and its Primary and Secondary Components with the Alpha Magnetic Spectrometer on the International Space Station. In: Physical Review Letters, 2018, vol. 121, n° 5, p. 051103. https://archive-ouverte.unige.ch/unige:106849

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Deposited on : 2018-08-06

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