{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/20599"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/20599","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Compton scattering from the proton below pion threshold: A measurement of the electric and magnetic polarizabilities of the proton","abstract":"The Compton scattering cross section on the proton was measured at laboratory angles of 90$\\sp\\circ$ and 135$\\sp\\circ$, using 70-100 MeV tagged photons, and simultaneously using 100-150 MeV untagged photons, in order to determine the electric and magnetic polarizabilities. The 135$\\sp\\circ$ cross section is sensitive to the difference of the electric and magnetic polarizabilities, $\\bar \\alpha - \\bar\\beta$, while the 90$\\sp\\circ$ cross section is sensitive to the electric polarizability $\\bar \\alpha$. Using the model independent sum rule constraint for $\\bar \\alpha$ + $\\bar \\beta$ and a model dependent dispersion relation calculation, the values for the polarizabilities extracted from the cross sections are:$$\\bar \\alpha = (12.5 \\pm 0.6 \\pm 0.8 \\pm 0.6) \\times 10\\sp{-4} fm\\sp3\\cr \\bar \\beta = (1.8 \\mp 0.6 \\mp 0.8 \\mp 0.6) \\times 10\\sp{-4} fm\\sp3$$where the errors shown are statistical, systematic, and model, respectively.","abstract_html":"The Compton scattering cross section on the proton was measured at laboratory angles of 90$\\sp\\circ$ and 135$\\sp\\circ$, using 70-100 MeV tagged photons, and simultaneously using 100-150 MeV untagged photons, in order to determine the electric and magnetic polarizabilities. The 135$\\sp\\circ$ cross section is sensitive to the difference of the electric and magnetic polarizabilities, <span class=\"etd-inline-math\">\\bar &alpha; - \\bar&beta;</span>, while the 90$\\sp\\circ$ cross section is sensitive to the electric polarizability <span class=\"etd-inline-math\">\\bar &alpha;</span>. Using the model independent sum rule constraint for <span class=\"etd-inline-math\">\\bar &alpha;</span> + <span class=\"etd-inline-math\">\\bar &beta;</span> and a model dependent dispersion relation calculation, the values for the polarizabilities extracted from the cross sections are:$<span class=\"etd-inline-math\">\\bar &alpha; = (12.5 \\pm 0.6 \\pm 0.8 \\pm 0.6) \\times 10\\sp{-4} fm\\sp3\\cr \\bar &beta; = (1.8 \\mp 0.6 \\mp 0.8 \\mp 0.6) \\times 10\\sp{-4} fm\\sp3</span>$where the errors shown are statistical, systematic, and model, respectively.","abstract_has_math":true,"creators":["MacGibbon, Bruce Everett"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Nathan, Alan M."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T12:43:51Z","date_published":"2011-05-07T12:43:51Z","updated_at":"2026-07-22T22:25:16Z","subjects":["Physics, Nuclear"],"languages":["eng"],"rights":["Copyright 1995 MacGibbon, Bruce Everett"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9543661","(UMI)AAI9543661"],"render_values":[{"text":"AAI9543661","href":null,"code":true},{"text":"(UMI)AAI9543661","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/20599","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Nathan, Alan M."]},{"key":"dc:creator","label":"Author","values":["MacGibbon, Bruce Everett"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T12:43:51Z","10000-01-01","1995"]},{"key":"dc:type","label":"Dc Type","values":["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."]},{"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, Nuclear"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1995 MacGibbon, Bruce Everett"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9543661","(UMI)AAI9543661","http://hdl.handle.net/2142/20599"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The Compton scattering cross section on the proton was measured at laboratory angles of 90$\\sp\\circ$ and 135$\\sp\\circ$, using 70-100 MeV tagged photons, and simultaneously using 100-150 MeV untagged photons, in order to determine the electric and magnetic polarizabilities. The 135$\\sp\\circ$ cross section is sensitive to the difference of the electric and magnetic polarizabilities, $\\bar \\alpha - \\bar\\beta$, while the 90$\\sp\\circ$ cross section is sensitive to the electric polarizability $\\bar \\alpha$. Using the model independent sum rule constraint for $\\bar \\alpha$ + $\\bar \\beta$ and a model dependent dispersion relation calculation, the values for the polarizabilities extracted from the cross sections are:$$\\bar \\alpha = (12.5 \\pm 0.6 \\pm 0.8 \\pm 0.6) \\times 10\\sp{-4} fm\\sp3\\cr \\bar \\beta = (1.8 \\mp 0.6 \\mp 0.8 \\mp 0.6) \\times 10\\sp{-4} fm\\sp3$$where the errors shown are statistical, systematic, and model, respectively.","Made available in DSpace on 2011-05-07T12:43:51Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9543661.pdf: 5122624 bytes, checksum: 0466e7e4ca15cdfafbcae4eaaac5d728 (MD5) Previous issue date: 1995","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:44:59Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:19:52-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"]},{"key":"dc:title","label":"Title","values":["Compton scattering from the proton below pion threshold: A measurement of the electric and magnetic polarizabilities of the proton"]}]}],"canonical_facts":{"dc:contributor":["Nathan, Alan M."],"dc:creator":["MacGibbon, Bruce Everett"],"dc:date":["2011-05-07T12:43:51Z","10000-01-01","1995"],"dc:description":["The Compton scattering cross section on the proton was measured at laboratory angles of 90$\\sp\\circ$ and 135$\\sp\\circ$, using 70-100 MeV tagged photons, and simultaneously using 100-150 MeV untagged photons, in order to determine the electric and magnetic polarizabilities. The 135$\\sp\\circ$ cross section is sensitive to the difference of the electric and magnetic polarizabilities, $\\bar \\alpha - \\bar\\beta$, while the 90$\\sp\\circ$ cross section is sensitive to the electric polarizability $\\bar \\alpha$. Using the model independent sum rule constraint for $\\bar \\alpha$ + $\\bar \\beta$ and a model dependent dispersion relation calculation, the values for the polarizabilities extracted from the cross sections are:$$\\bar \\alpha = (12.5 \\pm 0.6 \\pm 0.8 \\pm 0.6) \\times 10\\sp{-4} fm\\sp3\\cr \\bar \\beta = (1.8 \\mp 0.6 \\mp 0.8 \\mp 0.6) \\times 10\\sp{-4} fm\\sp3$$where the errors shown are statistical, systematic, and model, respectively.","Made available in DSpace on 2011-05-07T12:43:51Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9543661.pdf: 5122624 bytes, checksum: 0466e7e4ca15cdfafbcae4eaaac5d728 (MD5) Previous issue date: 1995","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:44:59Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:19:52-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9543661","(UMI)AAI9543661","http://hdl.handle.net/2142/20599"],"dc:language":["eng"],"dc:rights":["Copyright 1995 MacGibbon, Bruce Everett"],"dc:subject":["Physics, Nuclear"],"dc:title":["Compton scattering from the proton below pion threshold: A measurement of the electric and magnetic polarizabilities of the proton"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:16Z"}