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

Abstract

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.

arXiv commentREVTeX, 4 pages including 4 eps figures. Submitted to PRL

References in corpus (3)

• Local Flux of Low-Energy Antiprotons from Evaporating Primordial Black Holes
• Expected Enhancement of the Primary Antiproton Flux at the Solar Minimum
• A New Limit on the Flux of Cosmic Antihelium

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