Measurements of Atmospheric Antiprotons
arXiv:astro-ph/0509577 · doi:10.1016/j.physletb.2005.11.042
Abstract
We measured atmospheric antiproton spectra in the energy range 0.2 to 3.4 GeV, at sea level and at balloon altitude in the atmospheric depth range 4.5 to 26 g/cm^2. The observed energy spectra, including our previous measurements at mountain altitude, were compared with estimated spectra calculated on various assumptions regarding the energy distribution of antiprotons that interacted with air nuclei.
Accepted for publication in PLB