Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-06-28
Phys.Lett. B384 (1996) 161-168
Astronomy and Astrophysics
Astrophysics
14 pages, LaTeX, 4 postscript figures appended as uuencoded g-zipped tar file
Scientific paper
10.1016/0370-2693(96)00815-5
The leaky box model is now ruled out by measurements of a cosmic ray gradient throughout the galactic disk. It needs to be replaced by a more refined treatment which takes into account the diffusion of cosmic rays in the magnetic fields of the Galaxy. We have estimated the flux of antiprotons on the Earth in the framework of a two-zone diffusion model. Those species are created by the spallation reactions of high-energy nuclei with the interstellar gas. Another potential source of antiprotons is the annihilation of supersymmetric particles in the dark halo that surrounds our Galaxy. In this letter, we investigate both processes. Special emphasis is given to the antiproton signature of supersymmetric dark matter. The corresponding signal exceeds the conventional spallation flux below 300 MeV, a domain that will be thoroughly explored by the Antimatter Spectrometer experiment. The propagation of the antiprotons produced in the remote regions of the halo back to the Earth plays a crucial role. Depending on the energy, the leaky box estimates are wrong by a factor varying from 0.5 up to 3.
Chardonnet Pascal
Mignola G.
Salati Pierre
Taillet Richard
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