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Cosmic-Ray Positron Energy Spectrum Measured by PAMELA

TLDR
The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray positron flux and fraction that extends previously published measurements up to 300 GeV in kinetic energy.
Abstract
Precision measurements of the positron component in the cosmic radiation provide important information about the propagation of cosmic rays and the nature of particle sources in our Galaxy. The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray positron flux and fraction that extends previously published measurements up to 300 GeV in kinetic energy. The combined measurements of the cosmic-ray positron energy spectrum and fraction provide a unique tool to constrain interpretation models. During the recent solar minimum activity period from July 2006 to December 2009, approximately 24 500 positrons were observed. The results cannot be easily reconciled with purely secondary production, and additional sources of either astrophysical or exotic origin may be required.

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Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station

M. Aguilar, +279 more
TL;DR: In this paper, the Alpha Magnetic Spectrometer on the International Space Station was used to measure the primary cosmic-ray electron flux in the range 0.5 to 700 GeV and the positron flux in a range of 0.1 to 500 GeV.

Model-independent implications of the e , p cosmic ray spectra on properties of Dark Matter (updated including AMS 2013 data)

TL;DR: In this paper, the authors classify all two-body nonrelativistic Dark Matter annihilation channels to the allowed polarization states of Standard Model particles, computing the energy spectra of the stable nal-state particles relevant for indirect DM detection.
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A White Paper on keV sterile neutrino Dark Matter

Rathin Adhikari, +144 more
TL;DR: A comprehensive review of keV-scale neutrino Dark Matter can be found in this paper, where the role of active neutrinos in particle physics, astrophysics, and cosmology is reviewed.
References
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Journal ArticleDOI

Electrons and positrons in the galactic cosmic rays.

TL;DR: In the framework of the proposed two-component approach, it is possible to explain all the locally observed features of the energy spectrum of cosmic ray electrons from sub-GeV to TeV energies and the reported increase of the positron content in the Bux above 10 GeV.
Journal ArticleDOI

Leptons in near earth orbit

J. Alcaraz, +202 more
- 29 Jun 2000 - 
TL;DR: The lepton kinetic energy ranges from 0.2 to 40 GeV for e − and from 3 GeV to 6 GeVs for e + were measured by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at altitudes near 380 km.
Journal ArticleDOI

New Measurement of the Cosmic-Ray Positron Fraction from 5 to 15 GeV

TL;DR: The measurements do not support predictions of charge sign dependent solar modulation of the positron abundance at 5 GeV, and the combined data from the three HEAT flights indicate a small positron flux of nonstandard origin above 5GeV.
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