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Area of Science:

  • Astrophysics and particle physics
  • Cosmic ray physics

Background:

  • Cosmic rays provide insights into astrophysical phenomena.
  • Understanding the origin and behavior of cosmic-ray electrons and positrons is crucial for astrophysics.

Purpose of the Study:

  • To present precision measurements of cosmic-ray electron spectra.
  • To compare the energy-dependent behavior of cosmic-ray electrons and positrons.
  • To investigate the origins of high-energy cosmic-ray electrons and positrons.

Main Methods:

  • Analysis of 28.1 million electron events collected by the Alpha Magnetic Spectrometer (AMS) on the International Space Station.
  • Measurement of electron flux in the energy range of 0.5 GeV to 1.4 TeV.
  • Spectral analysis comparing electron and positron energy dependences.

Main Results:

  • Electron and positron spectra exhibit different magnitudes and energy dependencies.
  • A significant excess in the electron flux was observed starting around 42.1 GeV.
  • Unlike positron flux, electron flux shows no energy cutoff below 1.9 TeV.

Conclusions:

  • The distinct spectral behavior of cosmic-ray electrons and positrons suggests different origins.
  • Most high-energy electrons likely originate from sources distinct from those of high-energy positrons.