{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/85183"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/85183","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Probing and Raising the Lithium Problems With Hadronic Gamma Rays and Cosmic -Ray Nucleosynthesis","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.\"","abstract_html":""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."","abstract_has_math":false,"creators":["Prodanovic, Tijana S."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Astronomy","degree_department":null,"school":null,"contributors":["Fields, Brian D."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2006,"date_issued":"2006","date_published":"2006","updated_at":"2026-07-22T22:26:24Z","subjects":["Physics, Astronomy and Astrophysics"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI3242964"],"render_values":[{"text":"(MiAaPQ)AAI3242964","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/85183","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Fields, Brian D."]},{"key":"dc:creator","label":"Author","values":["Prodanovic, Tijana S."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2006","2015-09-25T22:35:37Z","10000-01-01"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Astronomy"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Astronomy and Astrophysics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/85183","(MiAaPQ)AAI3242964"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"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.\"","Made available in DSpace on 2015-09-25T22:35:37Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3242964.pdf: 2695472 bytes, checksum: b4e569605fec6fa78d6b330a7061d79d (MD5) Previous issue date: 2006","Embargo set by: Seth Robbins for item 86464 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","107 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006."]},{"key":"dc:title","label":"Title","values":["Probing and Raising the Lithium Problems With Hadronic Gamma Rays and Cosmic -Ray Nucleosynthesis"]}]}],"canonical_facts":{"dc:contributor":["Fields, Brian D."],"dc:creator":["Prodanovic, Tijana S."],"dc:date":["2006","2015-09-25T22:35:37Z","10000-01-01"],"dc:description":["\"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.\"","Made available in DSpace on 2015-09-25T22:35:37Z (GMT). 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