July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

New Calculation of Secondary Antiprotons in Cosmic Rays

Aug 1, 2015, 3:30 PM
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 185
Poster contribution CR-TH Poster 2 CR


Igor Moskalenko (Stanford University)


A dramatic increase in the accuracy and statistics of space-borne cosmic ray (CR) measurements has yielded several breakthroughs over the last several years. The most puzzling is the rise in the positron fraction above 10 GeV over the predictions of the propagation models assuming pure secondary production. Antiprotons are produced in CR interactions with interstellar gas and are, therefore, called secondary. These are the same interactions that produce charged and neutral mesons which decay to secondary electrons and positrons and gamma-rays. However, in contrast to CR electrons and positrons that can be produced copiously in pulsars, there is no known astrophysical source of primary antiprotons. Therefore, antiproton data and their correct interpretation hold the key to the resolution of many astrophysical puzzles. We calculated antiproton production in pp-, pA-, and AA-interactions using EPOS-LHC and QGSJET-II-04, two of the most advanced Monte Carlo generators tuned to accelerator data including those from the LHC. The new cross sections were incorporated into the GALPROP code to calculate the spectrum of secondary antiprotons in CRs.
Registration number following "ICRC2015-I/" 382
Collaboration -- not specified --

Primary author

Igor Moskalenko (Stanford University)


Elena Orlando (Stanford University) Gudlaugur Johannesson (Science Institute, University of Iceland) Prof. Michael Kachelriess (NTNU Norway) Sergey Ostapchenko (Frankfurt Institute for Advanced Studies) Troy Porter (Stanford University)

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