Detailed analysis of observed antiprotons in cosmic rays

In the present work, the origin of antiprotons observed in cosmic rays (above the atmosphere) is analyzed in details. we haveconsidered the origin of the primaries, (which their interactions with the interstellar medium is one of the most important sources ofantiprotons) is a supernova type ii then used a diffusion model for their propagation. we have used the latest parameterization forantiproton production cross section in pp collisions (instead of well known parameterization introduced by tan et al.) as well as ourcalculated residence time for primaries. the resulted intensity shows the secondary antiprotons produced in pp collisions in thegalaxy, have a high population as one can not consider an excess for extragalactic antiprotons. also there is a high degree ofuncertainty in different parameters.