Limits on antiproton-nuclei annihilation cross sections at ∼125 keV

Abstract Some experimental limits on the annihilation cross sections σ ann of antiprotons on carbon, palladium, and platinum targets were determined at the previously unexplored kinetic energy region E ≈ 125 keV. Information on σ ann at such low antiproton energies is important in understanding the dynamics of the annihilation process, and provides useful data for models that attempt to describe the matter-antimatter asymmetry in the universe by assuming the existence of islands of antimatter concentration.