Cosmic Ray Anti-nuclei and Dark Matter

  • Feb. 18, 2019, 2:00 pm US/Central
  • Curia II
  • Ilias Cholis, Oakland University

Antimatter cosmic ray measurements are used to advance our understanding of high energy astrophysical phenomena in the Galaxy. Using the antiproton cosmic ray measurements by the Alpha Magnetic Spectrometer (AMS) onboard the International Space Station, I will present work in search of unexpected sources of antiprotons. I will discuss the uncertainties related to the interstellar propagation of cosmic rays, the antiproton production cross-section from inelastic cosmic ray collisions with the interstellar medium, and the uncertainties from the effects of the solar wind. At GeV energies there is an excess of cosmic ray antiprotons that could be accounted for by a dark matter particle in the mass range of 50-90 GeV. Furthermore, I will discuss the production of anti-deuterons and anti-Helium nuclei from either high energy cosmic-rays or from dark matter annihilations. Interestingly, under certain interstellar medium assumptions we may be able to detect with AMS, cosmic-ray anti-deuterons and anti-Helium from annihilating dark matter particles.