Antiproton spectrum in the galactic wind model Original Research Article

The vast majority of cosmic-ray particles are protons and heavier nuclei. Antiprotons constitute only a small fraction of detected cosmic rays; and it is only recently that measurements with sufficient statistics in the range of 100 MeV to few GeV have been made and an accurate energy spectrum of antiprotons has been inferred. It is now becoming possible to compare and examine the prediction of various propagation models and search for a possible primary component of antiproton cosmic rays. In this paper we present the calculation of secondary antiproton spectrum in the Galactic Wind model. The effect of adiabatic loss in expanding Galactic wind leads to an antiproton spectrum different from the prediction of standard leaky-box model. This allows us to search for a signature of the Galactic wind in the cosmic-ray data.