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 × 10^6 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.

Aguilar, M., Cavasonza, L., Allen, M., Alpat, B., Ambrosi, G., Arruda, L., et al. (2021). Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer. PHYSICAL REVIEW LETTERS, 126(4) [10.1103/PhysRevLett.126.041104].

Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer

Gervasi, M.;Grandi, D.;La Vacca, G.;Pensotti, S.;Rozza, D.;Tacconi, M.;Zannoni, M.;
2021

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 × 10^6 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.
Articolo in rivista - Articolo scientifico
Cosmic Rays, Iron nuclei, Alpha Magnetic Spectrometer;
English
28-gen-2021
2021
126
4
041104
none
Aguilar, M., Cavasonza, L., Allen, M., Alpat, B., Ambrosi, G., Arruda, L., et al. (2021). Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer. PHYSICAL REVIEW LETTERS, 126(4) [10.1103/PhysRevLett.126.041104].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/300615
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