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A Measurement of the Antiproton Flux in the Cosmic Rays

Buffington, A. and Schindler, S. M. (1981) A Measurement of the Antiproton Flux in the Cosmic Rays. In: Proceedings of the 17th International Cosmic Ray Conference. Vol.2. CEN Saclay , Gif-sur Yvette, France, pp. 98-101.

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A balloon-borne instrument has been used to detect cosmic-ray antiprotons. These are identified topologically by the appearance of annihilation prongs in a thick lead-plate spark chamber. The initial recording of the data is enriched in potential antimatter events by a selective trigger. After a small subtraction for background, 14 identified antiprotons yield a flux of 1.7 plus or minus 0.00005 antiproton/(sq m ster sec MeV) between 130 and 320 MeV at the top of the atmosphere. When combined with higher energy antiproton flux measurements, this result indicates that the antiprotons have a spectrum whose shape is the same as that of the protons, but with a magnitude reduced by a factor of 1/3000.

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Additional Information:© IUPAP. Provided by the NASA Astrophysics Data System. This work was supported by grants NGR 05-003-553· and NGR 05-002-160from the National Aeronautics and Space Administration.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-003-553
NASANGR 05-002-160
Subject Keywords:Antiprotons, Balloon Sounding, Cosmic Rays, Proton Flux Density, Radiation Measurement, Data Recording, Energy Spectra, Spark Chambers, Upper Atmosphere
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Space Radiation Laboratory1981-07
Record Number:CaltechAUTHORS:20140417-142737320
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45027
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Deposited On:22 Apr 2014 19:09
Last Modified:03 Oct 2019 06:25

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