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Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer

CollaborationWith : Bourquin, Maurice / Chen, Yao / Liu, Zhen / Paniccia, Mercedes / Rapin, Divic Jean / Robyn, Erwan / Wei, Jiahui
Published in Physical review letters. 2021, vol. 126, no. 8, 081102
Abstract Precise knowledge of the charge and rigidity dependence of the secondary cosmic ray fluxes and the secondary-to-primary flux ratios is essential in the understanding of cosmic ray propagation. We report the properties of heavy secondary cosmic ray fluorine F in the rigidity $R$ range 2.15 GV to 2.9 TV based on 0.29 million events collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. The fluorine spectrum deviates from a single power law above 200 GV. The heavier secondary-to-primary F/Si flux ratio rigidity dependence is distinctly different from the lighter B/O (or B/C) rigidity dependence. In particular, above 10 GV, the $^{\textrm{F/Si}}_{\textrm{B/O}}$ ratio can be described by a power law $R^δ$ with $δ=0.052±0.007$. This shows that the propagation properties of heavy cosmic rays, from F to Si, are different from those of light cosmic rays, from He to O, and that the secondary cosmic rays have two classes.
Keywords Gravitation and Astrophysicscosmic radiation: secondaryflux: ratiocosmic radiation: propagationfluorinemagnetic spectrometerAMSsatelliteheliumoxygen
PMID: 33709764
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AMS COLLABORATION. Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer. In: Physical review letters , 2021, vol. 126, n° 8, p. 081102. doi: 10.1103/PhysRevLett.126.081102 https://archive-ouverte.unige.ch/unige:155086

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Deposited on : 2021-09-29

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