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Open AccessJournal ArticleDOI

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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Journal ArticleDOI

The Nine Lives of Cosmic Rays in Galaxies

TL;DR: The impact of low-energy cosmic rays on interstellar chemistry is a fast-developing topic, including the propagation of these particles into the clouds in which the chemistry occurs as mentioned in this paper.
Journal ArticleDOI

Dark matter annihilations and decays after the AMS-02 positron measurements

TL;DR: The AMS-02 Collaboration has recently presented high-quality measurements of the cosmic electron and positron fluxes as well as the positron fraction as mentioned in this paper, which can be used to derive limits on the dark matter annihilation cross section and lifetime for various final states.
Journal ArticleDOI

Towards Understanding the Origin of Cosmic-Ray Electrons.

M. Aguilar, +236 more
TL;DR: In this article, the authors presented precision results on cosmic-ray electrons in the energy range from 0.5 to 1.4, based on 28.1×106 electrons collected by the Alpha Magnetic Spectrometer on the International Space Station.
Journal ArticleDOI

Cosmic-ray propagation with DRAGON2 - I. numerical solver and astrophysical ingredients

TL;DR: In this paper, the DRAGON code is presented for computing realistic predictions of the galactic densities in the Galaxy, including inhomogeneous and anisotropic diffusion, either in space and momentum, advective transport and energy losses.
Journal ArticleDOI

The Alpha Magnetic Spectrometer (AMS) on the international space station: Part II - Results from the first seven years

M. Aguilar, +239 more
- 01 Feb 2021 - 
TL;DR: The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector on the International Space Station (ISS) conducting a unique, long-duration mission of fundamental physics research in space as mentioned in this paper.
References
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TL;DR: Internal estimates monitor error, strength, and correlation and these are used to show the response to increasing the number of features used in the forest, and are also applicable to regression.
Journal ArticleDOI

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TL;DR: The Gelfant 4 toolkit as discussed by the authors is a toolkit for simulating the passage of particles through matter, including a complete range of functionality including tracking, geometry, physics models and hits.
Journal ArticleDOI

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TL;DR: Machine learning addresses many of the same research questions as the fields of statistics, data mining, and psychology, but with differences of emphasis.
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