Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer
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© 2021 authors. Published by the American Physical Society. 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 0.62×106 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.
Date issued
2021-01Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
2021. "Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer." Physical Review Letters, 126 (4).
Version: Final published version
ISSN
0031-9007
1079-7114