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The spectral shape of cosmic ray positrons and antiprotons has beenaccurately measured in the broad kinetic energy range 1-350 GeV. In the higherpart of this range (E > 30 GeV) the e+ and pbar are both well described bypower laws with spectral indices gamma[e+] = 2.77 +-0.02 and gamma[pbar] = 2.78+- 0.04 that are approximately equal to each other and to the spectral index ofprotons.  In the same energy range the positron/antiproton flux ratio has theapproximately constant value 2.04+-0.04, that is consistent with being equal tothe ratio e_/pbar calculated for the conventional mechanism of production,where the antiparticles are created as secondaries in the inelasticinteractions of primary cosmic rays with interstellar gas.  The positron/antiproton ratio at lower energy is significantly higher(reaching the approximate value e+/pbar = 100 for E around 1 GeV), but in theentire energy range 1-350 GeV, the flux ratio is consistent with being equal toratio of the production rates in the conventional mechanism, as the productionof low energy antiprotons is kinematically suppressed in collisions with atarget at rest.  These results strongly suggest that cosmic ray positrons and antiprotons havea common origin as secondaries in hadronic interactions. This conclusion hasbroad implications for the astrophysics of cosmic rays in the Galaxy.

Interpretation of the cosmic ray positron and antiproton fluxes