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.
|ジャーナル||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|出版ステータス||Published - 1996 12 5|
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