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2011

A gamma-ray signature of energetic sources of cosmic-ray nuclei

Kusenko, Alexander, Voloshin, M. B.

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Astrophysical sources of nuclei are expected to produce a broad spectrum of isotopes, many of which are unstable.

An unstable nucleus can beta-decay outside the source into a single-electron ion.
Heavy one-electron ions, thus formed, can be excited in their interactions with cosmic microwave background photons, in which case they relax to the ground state with the emission of a gamma ray.
Repetitive cycles of excitation and gamma-ray emission can produce an observable feature in the gamma-ray spectrum with a maximum around 8 GeV (for iron).

A gamma-ray signature of energetic sources of cosmic-ray nuclei · Around

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