Cosmic Radiation and High Energy Interactions

Hopper, V. D.; Porter, Lori

doi:10.1119/1.1973106

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“…The vertical geomagnetic cut-off was determined following the Størmer formalism (e.g. [28]) on an event-by-event basis and using orbital parameters reconstructed at a rate of 1 Hz. Fig.…”

Section: The Positron Fractionmentioning

confidence: 99%

Observation of an anomalous positron abundance in the cosmic radiation

Adriani,

Barbarino,

Bazilevskaya

et al. 2008

Preprint

464

780

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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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“…The vertical geomagnetic cut-off was determined following the Størmer formalism (e.g. [28]) on an event-by-event basis and using orbital parameters reconstructed at a rate of 1 Hz. Fig.…”

Section: The Positron Fractionmentioning

confidence: 99%