Computer Science – Sound
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248.1179b&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 15, 1981, p. 1179-1193. Research supported by the U.S. Department of Energy;
Computer Science
Sound
156
Antiprotons, Balloon Sounding, Cosmic Rays, Energetic Particles, Helium, Balloon-Borne Instruments, Calibrating, Kinetic Energy, Milky Way Galaxy, Particle Acceleration
Scientific paper
Balloon-borne instrument measurements are presented of the cosmic-ray antiproton flux between 130 and 320 MeV, as well as the results of a search for antihelium between 130 and 370 MeV per nuclear. The antiprotons are found to have a spectral shape similar to the protons, down to about 100 MeV. Calculations of the expected flux of these particles under the assumption that they were created by collisions of high-energy cosmic rays with the interstellar gas, using the standard leaky box model for propagation in the Galaxy, predict a flux two orders of magnitude smaller than that observed. The discrepancy between calculation and experiment may be evidence that cosmic-ray protons have passed through more than 5.0 g/sq cm of material during their lifetime. The search for cosmic-ray antihelium sets a 95% confidence level upper limit on the antihelium/helium ratio of 0.000022.
Buffington Andrew
Pennypacker Carl R.
Schindler Stephen M.
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