Expected enhancement of the primary antiproton flux at the solar minimum

T. Mitsui, K. Maki, S. Orito

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


We calculate the solar-modulated energy spectra of cosmic-ray antiprotons (p̄'s) from two candidate primary sources, i.e., evaporating primordial black holes and the annihilation of neutralino dark matter, as well as for the secondary p̄'s produced by cosmic-ray interactions with interstellar gas. A large enhancement toward the solar minimum phase emerges in the low-energy flux of p̄'s from the primary sources, whereas the flux of the secondary p̄'s, falling steeply below 2 GeV, does not significantly vary. This enables us to conduct a very sensitive search for primary p̄ components by precisely measuring the p̄ spectrum, especially at low energies, throughout the forthcoming solar minimum phase.

Original languageEnglish
Pages (from-to)169-175
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1
Publication statusPublished - 1996 Dec 5
Externally publishedYes


  • Cosmic-ray antiprotons
  • Dark matter
  • Hawking radiation
  • Primordial black holes
  • Solar modulation
  • Supersymmetric models

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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