{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/18887"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/18887","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Measurement of the isovector giant quadrupole resonance in 208Pb using eleastic polarized photon scattering","abstract":"This experiment used highly polarized tagged photons to measure polarization asymmetries for elastic scattering in 208Pb in the energy region of the isovector giant quadrupole resonance (IVGQR). These measurements were performed at excitation energies between 16 and 30 MeV. Photons with enhanced linear polarization were obtained from an off-axis tagged photon beam by making a kinematic selection on the post-bremsstrahlung electrons. Scattered photons were detected in two large Nai(Tl) crystals. The polarization asymmetries clearly show the signature for interference between the isovector giant quadrupole resonance and the underlying electric dipole strength. The gross features of the IVGQR strength distribution were obtained in a relatively model independent manner. An isovector giant quadrupole resonance was observed at an excitation energy of 20.1±0.5 MeV, with a width of 6.3±0.5 MeV, and an energy weighted strength of 1.4±0.3 isovector sum rule units.","abstract_html":"This experiment used highly polarized tagged photons to measure polarization asymmetries for elastic scattering in 208Pb in the energy region of the isovector giant quadrupole resonance (IVGQR). These measurements were performed at excitation energies between 16 and 30 MeV. Photons with enhanced linear polarization were obtained from an off-axis tagged photon beam by making a kinematic selection on the post-bremsstrahlung electrons. Scattered photons were detected in two large Nai(Tl) crystals. The polarization asymmetries clearly show the signature for interference between the isovector giant quadrupole resonance and the underlying electric dipole strength. The gross features of the IVGQR strength distribution were obtained in a relatively model independent manner. An isovector giant quadrupole resonance was observed at an excitation energy of 20.1±0.5 MeV, with a width of 6.3±0.5 MeV, and an energy weighted strength of 1.4±0.3 isovector sum rule units.","abstract_has_math":false,"creators":["Dale, Daniel Stanton"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Laszewski, R.M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-04-27T15:07:33Z","date_published":"2011-04-27T15:07:33Z","updated_at":"2026-07-22T22:25:11Z","subjects":["isovector giant quadrupole resonance (IVGQR)","Lead 208 (208Pb)","elastic polarized photon scattering","polarization asymmetries","elastic scattering","linear polarization"],"languages":["en"],"rights":["1991 Daniel Stanton Dale"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["3476416"],"render_values":[{"text":"3476416","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/18887","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Laszewski, R.M."]},{"key":"dc:creator","label":"Author","values":["Dale, Daniel Stanton"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-04-27T15:07:33Z","10000-01-01","1991"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["isovector giant quadrupole resonance (IVGQR)","Lead 208 (208Pb)","elastic polarized photon scattering","polarization asymmetries","elastic scattering","linear polarization"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1991 Daniel Stanton Dale"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["3476416","http://hdl.handle.net/2142/18887"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["This experiment used highly polarized tagged photons to measure polarization asymmetries for elastic scattering in 208Pb in the energy region of the isovector giant quadrupole resonance (IVGQR). These measurements were performed at excitation energies between 16 and 30 MeV. Photons with enhanced linear polarization were obtained from an off-axis tagged photon beam by making a kinematic selection on the post-bremsstrahlung electrons. Scattered photons were detected in two large Nai(Tl) crystals. The polarization asymmetries clearly show the signature for interference between the isovector giant quadrupole resonance and the underlying electric dipole strength. The gross features of the IVGQR strength distribution were obtained in a relatively model independent manner. An isovector giant quadrupole resonance was observed at an excitation energy of 20.1±0.5 MeV, with a width of 6.3±0.5 MeV, and an energy weighted strength of 1.4±0.3 isovector sum rule units.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-04-27T15:07:33Z No. of bitstreams: 1 1991_Dale.pdf: 1455809 bytes, checksum: a76bb4f6a04014636cc035c202c9f9a3 (MD5)","Made available in DSpace on 2011-04-27T15:07:33Z (GMT). No. of bitstreams: 1 1991_Dale.pdf: 1455809 bytes, checksum: a76bb4f6a04014636cc035c202c9f9a3 (MD5) Previous issue date: 1991","Restriction data tranferred 2014-07-01T11:12:16-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-04-27T15:07:33Z Item is restricted indefinitely.","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Measurement of the isovector giant quadrupole resonance in 208Pb using eleastic polarized photon scattering"]}]}],"canonical_facts":{"dc:contributor":["Laszewski, R.M."],"dc:creator":["Dale, Daniel Stanton"],"dc:date":["2011-04-27T15:07:33Z","10000-01-01","1991"],"dc:description":["This experiment used highly polarized tagged photons to measure polarization asymmetries for elastic scattering in 208Pb in the energy region of the isovector giant quadrupole resonance (IVGQR). These measurements were performed at excitation energies between 16 and 30 MeV. Photons with enhanced linear polarization were obtained from an off-axis tagged photon beam by making a kinematic selection on the post-bremsstrahlung electrons. Scattered photons were detected in two large Nai(Tl) crystals. The polarization asymmetries clearly show the signature for interference between the isovector giant quadrupole resonance and the underlying electric dipole strength. The gross features of the IVGQR strength distribution were obtained in a relatively model independent manner. An isovector giant quadrupole resonance was observed at an excitation energy of 20.1±0.5 MeV, with a width of 6.3±0.5 MeV, and an energy weighted strength of 1.4±0.3 isovector sum rule units.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-04-27T15:07:33Z No. of bitstreams: 1 1991_Dale.pdf: 1455809 bytes, checksum: a76bb4f6a04014636cc035c202c9f9a3 (MD5)","Made available in DSpace on 2011-04-27T15:07:33Z (GMT). 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