Quote:
charged cosmic rays spectra of individual
elements below Z 25 and up to TeV region[7], high energy
rays up to few hun-
dreds GeV with good point-source localization
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I think this part is overly optimistic. Even at TEV energies, charged particle trajectories are seriously bent by galactic and stellar magnetic fields; while they are weak, they have a very long time in which to act, causing scattering of even a collimated beam. I would buy it that they can precisely locate the direction of reception, but after even moderately long interstellar travel, this doesn't correlate well with point of origin. The best (long-shot) chance for the detection described would be a beam of neutrons at relativistic velocities, which would delay their decay into protons until they were in our neighborhood. It's a quibble, I know, but see Stecker's paper:
http://arxiv.org/astro-ph/0309027 (Thanks again, Nereid-- the
magnum opus is a great quick reference guide to the whole subject), pp. 9ff. It might work reasonably well for very local sources less than 50Mpc, but keeping track of the errors will be devilish. S