Relative abundance of antiprotons and antihelium in the primary cosmic radiation

Details Relative abundance of antiprotons and antihelium in the primary cosmic radiation Relative abundance of antiprotons and antihelium in the primary cosmic radiation

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.274..137b&link_type=abstract

Nature, vol. 274, July 13, 1978, p. 137-139.

Physics

26

Abundance, Antimatter, Antiprotons, Helium, Primary Cosmic Rays, Particle Energy

Scientific paper

The paper reports measurement of the antiproton-to-proton and antihelium-to-helium ratios in the 4-100 GeV/c range. A superconducting magnet spectrophotometer obtained the data during a balloon flight in May 1976. The upper limit value for the antiproton ratio is 0.0005 in the 4.2-12.5 GeV/c range. This value is only slightly higher than the expected value for a leaky box-model and nearly equal to the value expected in the Peter-Westergard model. It is suggested that this upper limit value rules out the closed galaxy model. Upper limit values for the antihelium ratio are 0.000058 in the 4-10 GeV/c range; less than 0.0001 in the 4-33 GeV/c range; and less than 0.01 in the 33-100 GeV/c range. The interpretation of the raw data is explained.

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