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Recent Cosmic-Ray Antiproton Measurements and Astrophysical Implications

Buffington, Andrew and Schindler, Stephen M. (1981) Recent Cosmic-Ray Antiproton Measurements and Astrophysical Implications. Astrophysical Journal, 247 (Part 2). L105-L109. ISSN 0004-637X.

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Cosmic-ray antiprotons have been detected by a new balloon-borne experiment which covers the energy range between 130 and 320 MeV. Fourteen detected events yield a measured flux of 1.7±0.5 x 10^(-4) antiprotons m^(-2) sr^(-1) s(-1) MeV^(-1). The corresponding antiproton/proton ratio is 2.2± 0.6 x 10^(-4), only slightly smaller than the ratio observed by other experiments at higher energies. The measured flux is significantly larger than predicted, and some cosmic-ray models which could explain this result are discussed.

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Additional Information:© 1981 The American Astronomical Society. Received 1981 March 16; accepted 1981 April 14. This work was supported by grants NGR 05-003-553 and NGR 05-002-160 from the National Aeronautics and Space Administration. C. R. Pennypacker provided invaluable assistance in the preparation of the experiment.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANGR 05-003-553
NASANGR 05-002-160
Subject Keywords:Antiprotons, Astronomical Models, Cosmic Rays, Nuclear Reactions, Particle Collisions, Radiation Measurement, Astrophysics, Balloon-Borne Instruments, Flux Density, Interstellar Gas, Protons, Radiation Sources
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Space Radiation Laboratory1981-04
Issue or Number:Part 2
Record Number:CaltechAUTHORS:20140417-142336280
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45025
Deposited By: SWORD User
Deposited On:25 Apr 2014 18:45
Last Modified:03 Oct 2019 06:25

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