Cosmic-ray secondary antiprotons - A closer look

Details Cosmic-ray secondary antiprotons - A closer look Cosmic-ray secondary antiprotons - A closer look

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394..174g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 394, no. 1, July 20, 1992, p. 174-183.

Statistics

Computation

84

Antiprotons, Cosmic Rays, Nuclear Astrophysics, Astronomical Spectroscopy, Computational Astrophysics, Interstellar Matter

Scientific paper

Following a suggestion of Webber that early calculations underestimated the intensity of secondary anti-protons, we have systematically reexamined three aspects of the calculation: the normalization and shape of the present interstellar spectrum, nuclear enhancement of antiproton production in collisions involving nuclei, and the mean energy-dependent residence time of secondary nuclei and antiprotons in the Galaxy. In particular, we have a new estimate of the nuclear enhancement factor, based on the wounded nucleon model. Here we find that the presence of heavy nuclei in the cosmic rays increases the antiproton flux by only 20% over a pure proton composition. We conclude that the reported experimental values of the antiproton-to-proton ratio of Ep ≈ 6-12 GeV remain significantly above the range of theoretical expectation allowed by uncertainties in the input assumptions.

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