Observation of an anomalous positron abundance in the cosmic radiation

Details Observation of an anomalous positron abundance in the cosmic radiation Observation of an anomalous positron abundance in the cosmic radiation

2008-10-28

arxiv.org/abs/0810.4995v1

Nature 458:607-609,2009

Astronomy and Astrophysics

Astrophysics

Submitted to Nature, 20 pages, 5 figures, 1 table

Scientific paper

10.1038/nature07942

Positrons are known to be produced in interactions between cosmic-ray nuclei and interstellar matter ("secondary production"). Positrons may, however, also be created by dark matter particle annihilations in the galactic halo or in the magnetospheres of near-by pulsars. The nature of dark matter is one of the most prominent open questions in science today. An observation of positrons from pulsars would open a new observation window on these sources. Here we present results from the PAMELA satellite experiment on the positron abundance in the cosmic radiation for the energy range 1.5 - 100 GeV. Our high energy data deviate significantly from predictions of secondary production models, and may constitute the first indirect evidence of dark matter particle annihilations, or the first observation of positron production from near-by pulsars. We also present evidence that solar activity significantly affects the abundance of positrons at low energies.

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