Astrophysical Systematics on Anti-nuclei Cosmic-Rays and Dark Matter*

Antimatter cosmic-rays are used to study high energy astrophysical phenomena in the Galaxy. Using the antiproton cosmic-ray measurements by the Alpha Magnetic Spectrometer (AMS) on board ISS, 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 the interstellar medium, as well as the uncertainties from the effects of the solar wind. At the GeV range there is an excess of cosmic-ray antiprotons that could be accounted for by a dark matter particle in the mass range of 50 to 90 GeV. Also I will discuss the prospects of detecting anti-deuterons and anti-Helium nuclei produced both from inelastic collisions of high energy cosmic-rays with the interstellar medium gas and from dark matter annihilations. Interestingly, under certain astrophysical assumptions AMS may detect cosmic-ray anti-deuterons and anti-Helium from annihilating dark matter particles.