• PEBS - Positron Electron Balloon Spectrometer
• PEBS physics
  • Electrons and Positrons
    • Electrons from galactic accelerators
    • Interstellar secondary production
    • Pair production in the galaxy
    • Top-down scenarios
  • Positron fraction
  • Systematic Issues in Electron and Positron Measurements
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  • High energy electron sky map
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Electrons and Positrons

Simulation of a 5 GeV positron hitting the PEBS calorimeter

Cosmic-ray electrons and positrons are much less abundant than cosmic-ray protons, but ever since the pioneering observations in the 1960's (largely by a University of Chicago group), have they been of special interest in cosmic-ray astrophysics. Still today, they pose new and exciting questions but also substantial experimental challenges. The observed electron/positron intensity may have contributions from several mechanisms:

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• Electrons from galactic accelerators
• Interstellar secondary production
• Pair production in the galaxy
• Top-down scenarios