Antiproton upper limits from the observed charge ratio of muons and their implications for cosmic ray models

Details Antiproton upper limits from the observed charge ratio of muons and their implications for cosmic ray models Antiproton upper limits from the observed charge ratio of muons and their implications for cosmic ray models

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149....1s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 1, Aug. 1985, p. 1-6.

Astronomy and Astrophysics

Astrophysics

16

Antiprotons, Cosmic Ray Showers, Cosmic Rays, Energy Spectra, High Energy Interactions, Muons, Abundance, Astronomical Models, Charged Particles, Galactic Cosmic Rays, Particle Acceleration

Scientific paper

The possibility of deriving useful upper limits to the fraction of antiprotons (p-bar) in cosmic radiation, by making use of the observed charge ratio of muons at sea-level, is explored. The upper limits thus derived for (p-bar/p) ratio are 7, 17, 10, and 14 percent, respectively, for the energy intervals 0.1 to 0.2 TeV, 1.0 to 1.5 TeV, 10 to 15 TeV, and less than 30 TeV. These upper limits are primarily based on the large uncertainties associated with the theoretical estimates compared to the errors associated with the measurements of the muon charge ratio. The possibility of improving the parameterization of the high energy interaction characteristics, which go into these calculations, is pointed out and as a result, the upper limits derived here can be improved in the near future. If the observed cosmic ray p-bar are of extragalactic origin, it is expected that the (p-bar/p) ratio should increase with energy, in the framework of the energy dependent confinement model for cosmic rays in the Galaxy. The implication of the derived upper limits on these models are discussed and the difficulty for these models to co-exist is brought out.

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