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Cosmic-Ray Electron Flux Measured by the PAMELA Experiment between 1 and 625 GeV
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics.
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2011 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 106, no 20, 201101- p.Article in journal (Refereed) Published
Abstract [en]

Precision measurements of the electron component in the cosmic radiation provide important information about the origin and propagation of cosmic rays in the Galaxy. Here we present new results regarding negatively charged electrons between 1 and 625 GeV performed by the satellite-borne experiment PAMELA. This is the first time that cosmic-ray e(-) have been identified above 50 GeV. The electron spectrum can be described with a single power-law energy dependence with spectral index -3.18 +/- 0.05 above the energy region influenced by the solar wind (> 30 GeV). No significant spectral features are observed and the data can be interpreted in terms of conventional diffusive propagation models. However, the data are also consistent with models including new cosmic-ray sources that could explain the rise in the positron fraction.

Place, publisher, year, edition, pages
2011. Vol. 106, no 20, 201101- p.
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-34360DOI: 10.1103/PhysRevLett.106.201101ISI: 000290762900001ScopusID: 2-s2.0-79960645638OAI: diva2:429896
Swedish Research Council

QC 20110706

Available from: 2011-07-06 Created: 2011-06-07 Last updated: 2016-05-09Bibliographically approved

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