Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.188..299h&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 188, no. 2, Feb. 1992, p. 299-320.
Astronomy and Astrophysics
Astrophysics
Antiprotons, Astronomical Models, Interstellar Matter, Particle Production, Cosmic Rays, Shock Waves
Scientific paper
The efficiency of the antiproton (p-bar) production in interstellar clouds is increased by a factor above about 50 when the engendering cosmic-ray protons (CRs) experience diffusive acceleration by shocks. The p-bar/p observations can be represented by a conventional multiphase model of the interstellar medium in which the volume-filling factor for shocked clouds is less than 1 percent of that for all clouds. The p-bar/p ratio will reach a maximum value at an energy which depends upon a typical cloud size; the present observations give this size to be greater than about 1 pc. If individual cloud sizes do not get very much larger then the p-bar/p value may peak at a low energy, slightly above about 10 GeV. The porosity factor of Cox and Smith (1974) is limited. Standard CR confinement models are examined using a diffusion equation approach. Most of the production of p-bar's by any old CR population will occur in shocked clouds near the galactic plane. One does not need to assume an old CR population exists in order to explain the p-bar observations.
Helfer Lawrence H.
Savedoff Malcolm P.
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