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Properties of Iron Primary 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. 4, p. 041104
Abstract We report the observation of new properties of primary iron (Fe) cosmic rays in the rigidity range 2.65 GV to 3.0 TV with 0.62 million iron nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. Above 80.5 GV the rigidity dependence of the cosmic ray Fe flux is identical to the rigidity dependence of the primary cosmic ray He, C, and O fluxes, with the Fe/O flux ratio being constant at 0.155±0.006. This shows that unexpectedly Fe and He, C, and O belong to the same class of primary cosmic rays which is different from the primary cosmic rays Ne, Mg, and Si class.
Keywords Cosmic raysCosmic ray nucleiIron nucleiAMSAlpha magnetic SpectrometerInternational Space StationISSSapce detectorsAstroparticle physicsCosmic ray physicsCosmic ray iron
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AMS COLLABORATION. Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer. In: Physical Review Letters, 2021, vol. 126, n° 4, p. 041104. doi: 10.1103/PhysRevLett.126.041104 https://archive-ouverte.unige.ch/unige:148402

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Deposited on : 2021-02-01

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