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

1998/09/25 by H. Matsunaga, S. Orito, H. Matsumoto +28 · 3 citations
Medicine · Physics and Astronomy · #Antiproton #Astronomy #Astrophysics #Atomic physics #COSMIC cancer database #Cosmic ray #Dark Matter and Cosmic Phenomena #Low energy #Nuclear physics #Physics #Proton #Radiation Detection and Scintillator Technologies #Radiation Therapy and Dosimetry #Ultra-high-energy cosmic ray #astro-ph

paper · pdf · doi:10.1103/physrevlett.81.4052

published as Phys.Rev.Lett.81:4052-4055,1998 · REVTeX, 4 pages including 4 eps figures. Submitted to PRL

arxiv created 1998/09/25 · openalex publication_date 1998/11/09 · arxiv updated 2011/08/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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 1995 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.

Citations

• Particle creation by black holes
• A new limit on the flux of cosmic antihelium

Cited by

• Measurements of 0.2–20GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer
• Probing gravitino dark matter with PAMELA and Fermi
• Supersymmetric Dark Matter and the Extragalactic Gamma Ray Background