Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum

Details Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum

1998-09-25

arxiv.org/abs/astro-ph/9809326v1

Phys.Rev.Lett.81:4052-4055,1998

Astronomy and Astrophysics

Astrophysics

REVTeX, 4 pages including 4 eps figures. Submitted to PRL

Scientific paper

10.1103/PhysRevLett.81.4052

The absolute fluxes of the cosmic-ray antiprotons at solar minimum are measured in the energy range 0.18 to 1.4 GeV, based on 43 events unambiguously detected in BESS '95 data. The resultant energy spectrum appears to be flat below 1 GeV, compatible with a possible admixture of primary antiproton component with a soft energy spectrum, while the possibility of secondary antiprotons alone explaining the data cannot be excluded with the present accuracy. Further improvement of statistical accuracy and extension of the energy range are planned in future BESS flights.

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