Observation of the Identical Rigidity Dependence of the Primary Cosmic Rays Helium, Carbon and Oxygen fluxes by the Alpha Magnetic Spectrometer on the International Space Station
August 02, 2019
We report on the observation of new and unexpected properties of primary cosmic rays, He, C, and O, measured in the rigidity (momentum/charge) range 2~GV to $3$~TV with 90 million helium, 8.4 million carbon, and 7.0 million oxygen nuclei collected by the Alpha Magnetic Spectrometer on the International Space Station during the first 5 years of operation. Unexpectedly, above 60 GV, these three spectra have identical rigidity dependence. They all deviate from a single power law above 200~GV and harden in an identical way. These are new and unexpected properties of primary cosmic rays and they are challenging current model of CR production, acceleration, and propagation.
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