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

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 $\frac{\textrm{F/Si}}{\textrm{B/O}}$ ratio can be described by a power law $R^\delta$ with $\delta = 0.052 \pm 0.007$. 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.

Phys. Rev. Lett. 126, 081102
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AMS-02 Publications

Total citations to-date: 4, 825
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Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer
Phys. Rev. Lett. 126, 081102 (2021), Citations: 1, View supplemental material and data
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Phys. Rev. Lett. 121, 051102 (2018), Citations: 55, View supplemental material and data
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Phys. Rev. Lett. 121, 051101 (2018), Citations: 59, View supplemental material and data
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Phys. Rev. Lett. 120, 021101 (2018), Citations: 126, View supplemental material and data
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Phys. Rev. Lett. 119, 251101 (2017), Citations: 143, View supplemental material and data
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Phys. Rev. Lett. 117, 231102 (2016), Citations: 246, View supplemental material and data
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Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 117, 091103 (2016), Citations: 391, View supplemental material and data
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Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 115, 211101 (2015), Citations: 356, View supplemental material and data
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Precision Measurement of the Proton Flux in Primary Cosmic Rays from Rigidity 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 114, 171103 (2015), Citations: 635, View supplemental material and data
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Precision Measurement of the (${\rm e}^+$ + ${\rm e}^−$) Flux in Primary Cosmic Rays from 0.5 GeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 113, 221102 (2014), Citations: 301, View supplemental material and data
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Phys. Rev. Lett. 113, 121102 (2014), Citations: 526, View supplemental material and data
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High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5 – 500 GeV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 113, 121101 (2014), Citations: 575, View supplemental material and data
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First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–350 GeV
Phys. Rev. Lett. 110, 141102 (2013), Citations: 1,154, View supplemental material and data

* Citation information from High-Energy Physics Literature Database.