Expected Enhancement of the Primary Antiproton Flux at the Solar Minimum

Details Expected Enhancement of the Primary Antiproton Flux at the Solar Minimum Expected Enhancement of the Primary Antiproton Flux at the Solar Minimum

1996-08-20

arxiv.org/abs/astro-ph/9608123v1

Phys.Lett. B389 (1996) 169-175

Astronomy and Astrophysics

Astrophysics

19 pages, 4 PostScript figures

Scientific paper

10.1016/S0370-2693(96)01363-9

We calculate the solar-modulated energy spectra of cosmic-ray antiprotons ($\bar{p}$'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 $\bar{p}$'s produced by cosmic-ray interactions with interstellar gas. A large enhancement toward the solar minimum phase emerges in the low-energy flux of $\bar{p}$'s from the primary sources, whereas the flux of the secondary $\bar{p}$'s, falling steeply below 2 GeV, does not significantly vary. This enables us to conduct a very sensitive search for primary $\bar{p}$ components by precisely measuring the $\bar{p}$ spectrum, especially at low energies, throughout the forthcoming solar minimum phase.

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