Physics – Nuclear Physics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285..386s&link_type=abstract
Nature, vol. 285, June 5, 1980, p. 386-388.
Physics
Nuclear Physics
31
Antiprotons, Particle Collisions, Positrons, Primary Cosmic Rays, Secondary Cosmic Rays, Energy Spectra, Interstellar Matter, Nuclei (Nuclear Physics)
Scientific paper
Estimates of the primary spectra of cosmic ray components and nuclear physical data on antiproton production in the relevant particle collisions were used to derive the expected antiproton spectrum for the traversal of 1 g/sq cm of the interstellar medium (ISM) (or 1 g/sq cm of hydrogen-equivalent). This is compared with the observed antiproton spectrum, and the mean grammage required is determined. The antiproton measurements give further evidence against the leaky box model of cosmic ray propagation and point to a more complex manner of propagation, probably involving considerable fractions of particle lifetimes spent in the galactic halo. An alternative explanation in terms of extragalactic antiprotons from antigalaxies, although unlikely, cannot be ruled out.
Szabelski Jacek
Wdowczyk Jerzy
Wolfendale Arnold W.
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