Recent cosmic-ray antiproton measurements and astrophysical implications

Details Recent cosmic-ray antiproton measurements and astrophysical implications Recent cosmic-ray antiproton measurements and astrophysical implications

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247l.105b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, Aug. 1, 1981, p. L105-L109.

Astronomy and Astrophysics

Astrophysics

19

Antiprotons, Astronomical Models, Cosmic Rays, Nuclear Reactions, Particle Collisions, Radiation Measurement, Astrophysics, Balloon-Borne Instruments, Flux Density, Interstellar Gas, Protons, Radiation Sources

Scientific paper

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 plus or minus 0.5 x 10 to the -4th antiprotons/sq m sr s MeV. The corresponding antiproton/proton ratio is 2.2 plus or minus 0.6 x 10 to the -4th, 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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