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Astroparticle Physics

Antimatter fluxes in the Milky Way

by Michael Kachelriess (Throndeim University, Norway)

Building 67, SemRm 10 (DESY Hamburg)

Building 67, SemRm 10

DESY Hamburg

Measurements of the nuclear composition and of the antimatter fraction of cosmic rays (CR) are a main tool to understand the origin of CRs. If the antimatter fluxes from astrophysical sources can be estimated sufficiently reliable, a search for possible excesses can be used to detect dark matter (DM). After a general introduction, I discuss the suggestion that the re-acceleration of CR secondaries in supernova remnants leads to positron and antiproton ratios increasing with energy. I present also results for the B/C ratio which can be soon tested by the AMS-2 experiment. In the second part of the talk, I review the production of antideuterons, both in DM annihilations and in pp collisions. In the former case, I stress the importance of event-by-event simulations of antideuteron coalescence and discuss the model uncertainties. Finally, I argue that the antideuteron yield especially at low energies is underestimated in commonly used models.