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positrons

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Where are the positrons coming from?

In today’s astrobite, we discuss the puzzling results from the AMS-02 experiment, which has detected an excess of positrons in cosmic rays with respect to what we expect from known physical sources. Where are those positrons coming from?

An Excess of Positivity

The Fermi Large Area Telescope used a clever method of splitting electrons and positrons via the Earth’s magnetic field to show that there’s a significant excess of cosmic ray positrons at high energies – much more than can be explained using known cosmic ray processes.

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