Lithium-6 and gamma-rays: Constraints on primordial lithium, cosmic rays and cosmic star formation

Tijana Prodanović, Brian D. Fields

Research output: Contribution to journalArticlepeer-review

Abstract

Cosmic-ray (CR) reactions with the interstellar gas produce both Li (predominantly via αCR + α →6,7 Li) and γ-rays (via pCR + p → π0 → γγ). We establish the link between them analytically, then apply it to constrain both galactic CR nucleosynthesis as well as extragalactic γ-ray production. We exploit the extragalactic γ-ray spectrum to place constraints on the hadronic production by cosmic rays, and then use the γ - π0 - Li connection to place upper limits on the production of non-primordial Li via cosmic rays accelerated in the shocks arising from cosmological structure formation. Turning the problem around, we use observations of the Galactic Li both in the Solar System and in the ancient halo stars, to constraint the contribution of the galactic cosmic rays to the diffuse extragalactic γ-ray background.

Original languageEnglish (US)
Pages (from-to)799-802
Number of pages4
JournalNuclear Physics A
Volume758
Issue number1-4 SPEC. ISS.
DOIs
StatePublished - Jul 25 2005

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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