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Extended results on the cosmic-ray electron + positron spectrum from 11 GeVto 4.8 TeV are presented based on observations with the Calorimetric ElectronTelescope (CALET) on the International Space Station utilizing the data up toNovember 2017. The analysis uses the full detector acceptance at high energies,approximately doubling the statistics compared to the previous result. CALET isan all-calorimetric instrument with a total thickness of 30 $X_0$ at normalincidence and fine imaging capability, designed to achieve large protonrejection and excellent energy resolution well into the TeV energy region. Theobserved energy spectrum in the region below 1 TeV shows good agreement withAlpha Magnetic Spectrometer (AMS-02) data. In the energy region below $\sim$300GeV, CALET's spectral index is found to be consistent with the AMS-02, FermiLarge Area Telescope (Fermi-LAT) and Dark Matter Particle Explorer (DAMPE),while from 300 to 600 GeV the spectrum is significantly softer than the spectrafrom the latter two experiments. The absolute flux of CALET is consistent withother experiments at around a few tens of GeV. However, it is lower than thoseof DAMPE and Fermi-LAT with the difference increasing up to several hundredGeV. The observed energy spectrum above $\sim$1 TeV suggests a flux suppressionconsistent within the errors with the results of DAMPE, while CALET does notobserve any significant evidence for a narrow spectral feature in the energyregion around 1.4 TeV. Our measured all-electron flux, including statisticalerrors and a detailed breakdown of the systematic errors, is tabulated in theSupplemental Material in order to allow more refined spectral analyses based onour data.

physical review letters

Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum  from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the  International Space Station