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Title:Probing and Raising the Lithium Problems With Hadronic Gamma Rays and Cosmic -Ray Nucleosynthesis
Author(s):Prodanovic, Tijana S.
Doctoral Committee Chair(s):Fields, Brian D.
Department / Program:Astronomy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Astronomy and Astrophysics
Abstract:Besides lithium, CRs also produce "pionic" gamma-rays through pp → pi0 → gammagamma. Thus there is an intimate link between Li and gamma-rays produced in CR interactions. In this thesis we explore this link and use it as a new, model-independent way of testing the CR nucleosynthesis of Li. We apply this tool to test a, still hypothetical, cosmological CR population. Moreover, our approach reveals yet another Li problem. The isotope 6Li is made only in CR interactions where the standard assumption is that the measured solar 6Li abundance originated from interactions of galactic cosmic-rays (GCRs) with the interstellar medium. However, by applying our tool on this fiducial case, we found that gamma-ray observations allow for only ≈ 60% of the solar 6Li abundance to be produced by standard GCRs. This result bears important consequences for the non-standard sources of 6Li nucleosynthesis such as decaying dark matter and low-energy cosmic-ray component.
Issue Date:2006
Description:107 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006.
Other Identifier(s):(MiAaPQ)AAI3242964
Date Available in IDEALS:2015-09-25
Date Deposited:2006

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