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The Latest Results on High Energy Cosmic Rays
Name
ICHEP2018_732.pdf
Description
Published version
Size
2.69 MB
Format
Adobe PDF
Checksum (MD5)
dbfc6db4a962abb59d09afa6992e371b
Author(s)
Kounine, Andrei
Ting, Samuel
Journal
Proceedings of Science
Publisher
Sissa Medialab
Version
Final published version
Abstract
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). Four detectors operate currently in space exploring a new and exciting frontier in physics research: AMS, CALET, DAMPE, and ISS-CREAM. Of these four detectors AMS is the only magnetic spectrometer. Precision measurements by AMS of the fluxes of cosmic ray positrons, electrons, antiprotons, protons and light nuclei as well as their ratios reveal several unexpected and intriguing features. The presented measurements extend the energy range of the previous observations with much increased precision. The new results show that the positron flux rises from ∼10 GeV above the rate expected from cosmic ray collisions with interstellar gas and then exhibits a sharp drop off above ∼300 GeV. This is consistent with a new source of high energy positrons. Surprisingly, in this rigidity (i.e. momentum divided by charge) range the spectral indices of cosmic ray nuclei experience progressive hardening over the rigidity interval of few hundred GV. This hardening is more pronounced for the secondary nuclei such as lithium, beryllium, and boron than for the primary nuclei helium, carbon and oxygen. Most importantly, AMS continues studies of complex antimatter candidates with stringent detector verification and collection of additional data.
Terms of Use
Creative Commons Attribution-NonCommercial-NoDerivs License
Persistent DSpace Link
DOI of Published Version
10.22323/1.340.0732
