{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/34258"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/34258","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Measurement of neutrino mixing angle Θ13 in the Daya Bay Reactor Neutrino Experiment","abstract":"Neutrino oscillations have been observed in experiments measuring solar, atmospheric, accelerator and reactor neutrinos. The phenomenon can be described by three mixing angles and three phases. The values of two mixing angles $\\theta_{12}$ and $\\theta_{23}$ have been pinned down while the value of $\\theta_{13}$ was poorly known. The Daya Bay Reactor Antineutrino Experiment was designed to measure $\\sin^{2}2\\theta_{13}$ with a sensitivity of 0.01 or better by detecting antineutrinos from nuclear reactors with multiple identically designed detectors at different baselines. Antineutrinos were identified by inverse beta decay $\\bar{\\nu}_{e} + p \\rightarrow e^{+} + n$ in 20~tons of Gadolinium-doped liquid scintillator which served as both target and detector. A search for $\\bar{\\nu}_{e}$ deficits, a process which would manifest a nonzero value of the $\\theta_{13}$ mixing angle, was performed. Between December 2011 and Feb 2012, 55 days of data were collected. During this time, 80376 and 10416 electron antineutrino candidates were detected with 1545 and 515 expected background events at the near sites and the far site respectively. A rate-only analysis supports neutrino flavor oscillation with $\\sin^{2}2\\theta_{13} = 0.0936\\pm0.0172$ in a 2-neutrino mixing framework.","abstract_html":"Neutrino oscillations have been observed in experiments measuring solar, atmospheric, accelerator and reactor neutrinos. The phenomenon can be described by three mixing angles and three phases. The values of two mixing angles <span class=\"etd-inline-math\">&theta;<sub>12</sub></span> and <span class=\"etd-inline-math\">&theta;<sub>23</sub></span> have been pinned down while the value of <span class=\"etd-inline-math\">&theta;<sub>13</sub></span> was poorly known. The Daya Bay Reactor Antineutrino Experiment was designed to measure <span class=\"etd-inline-math\">\\sin<sup>2</sup>2&theta;<sub>13</sub></span> with a sensitivity of 0.01 or better by detecting antineutrinos from nuclear reactors with multiple identically designed detectors at different baselines. Antineutrinos were identified by inverse beta decay <span class=\"etd-inline-math\">\\bar{\\nu}<sub>e</sub> + p \\rightarrow e<sup>+</sup> + n</span> in 20~tons of Gadolinium-doped liquid scintillator which served as both target and detector. A search for <span class=\"etd-inline-math\">\\bar{\\nu}<sub>e</sub></span> deficits, a process which would manifest a nonzero value of the <span class=\"etd-inline-math\">&theta;<sub>13</sub></span> mixing angle, was performed. Between December 2011 and Feb 2012, 55 days of data were collected. During this time, 80376 and 10416 electron antineutrino candidates were detected with 1545 and 515 expected background events at the near sites and the far site respectively. A rate-only analysis supports neutrino flavor oscillation with <span class=\"etd-inline-math\">\\sin<sup>2</sup>2&theta;<sub>13</sub> = 0.0936\\pm0.0172</span> in a 2-neutrino mixing framework.","abstract_has_math":true,"creators":["Ngai, Wah Kai"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Peng, Jen-Chieh","Thaler, Jonathan J.","Willenbrock, Scott S.","Kwiat, Paul G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2012,"date_issued":"2012-09-18T21:08:17Z","date_published":"2012-09-18T21:08:17Z","updated_at":"2026-07-22T22:25:30Z","subjects":["neutrino","Mixing","angle","theta13","daya bay","reactor"],"languages":["en"],"rights":["Copyright 2012 Wah Kai Ngai"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/34258","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Peng, Jen-Chieh","Thaler, Jonathan J.","Willenbrock, Scott S.","Kwiat, Paul G."]},{"key":"dc:creator","label":"Author","values":["Ngai, Wah Kai"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2012-09-18T21:08:17Z","2012-08"]},{"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":["neutrino","Mixing","angle","theta13","daya bay","reactor"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2012 Wah Kai Ngai"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/34258"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Neutrino oscillations have been observed in experiments measuring solar, atmospheric, accelerator and reactor neutrinos. The phenomenon can be described by three mixing angles and three phases. The values of two mixing angles $\\theta_{12}$ and $\\theta_{23}$ have been pinned down while the value of $\\theta_{13}$ was poorly known. The Daya Bay Reactor Antineutrino Experiment was designed to measure $\\sin^{2}2\\theta_{13}$ with a sensitivity of 0.01 or better by detecting antineutrinos from nuclear reactors with multiple identically designed detectors at different baselines. Antineutrinos were identified by inverse beta decay $\\bar{\\nu}_{e} + p \\rightarrow e^{+} + n$ in 20~tons of Gadolinium-doped liquid scintillator which served as both target and detector. A search for $\\bar{\\nu}_{e}$ deficits, a process which would manifest a nonzero value of the $\\theta_{13}$ mixing angle, was performed. Between December 2011 and Feb 2012, 55 days of data were collected. During this time, 80376 and 10416 electron antineutrino candidates were detected with 1545 and 515 expected background events at the near sites and the far site respectively. A rate-only analysis supports neutrino flavor oscillation with $\\sin^{2}2\\theta_{13} = 0.0936\\pm0.0172$ in a 2-neutrino mixing framework.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-05-16T19:55:39Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Thesis.zip: 46411794 bytes, checksum: d00fb366d0a6582c2176bc3112ebd0cd (MD5) Ngai_WahKai.pdf: 17386654 bytes, checksum: 30152c72e8f74d6e0a5592f9ef0ef1bc (MD5)","Made available in DSpace on 2012-09-18T21:08:17Z (GMT). No. of bitstreams: 3 Ngai_WahKai.pdf: 17386683 bytes, checksum: 3b1b6b1e90ca6293f0275f6345c43cf7 (MD5) license.txt: 4056 bytes, checksum: fc103dcdbd48b0563465b1510b890179 (MD5) Thesis.zip: 46411794 bytes, checksum: d00fb366d0a6582c2176bc3112ebd0cd (MD5)"]},{"key":"dc:title","label":"Title","values":["Measurement of neutrino mixing angle Θ13 in the Daya Bay Reactor Neutrino Experiment"]}]}],"canonical_facts":{"dc:contributor":["Peng, Jen-Chieh","Thaler, Jonathan J.","Willenbrock, Scott S.","Kwiat, Paul G."],"dc:creator":["Ngai, Wah Kai"],"dc:date":["2012-09-18T21:08:17Z","2012-08"],"dc:description":["Neutrino oscillations have been observed in experiments measuring solar, atmospheric, accelerator and reactor neutrinos. The phenomenon can be described by three mixing angles and three phases. The values of two mixing angles $\\theta_{12}$ and $\\theta_{23}$ have been pinned down while the value of $\\theta_{13}$ was poorly known. The Daya Bay Reactor Antineutrino Experiment was designed to measure $\\sin^{2}2\\theta_{13}$ with a sensitivity of 0.01 or better by detecting antineutrinos from nuclear reactors with multiple identically designed detectors at different baselines. Antineutrinos were identified by inverse beta decay $\\bar{\\nu}_{e} + p \\rightarrow e^{+} + n$ in 20~tons of Gadolinium-doped liquid scintillator which served as both target and detector. A search for $\\bar{\\nu}_{e}$ deficits, a process which would manifest a nonzero value of the $\\theta_{13}$ mixing angle, was performed. Between December 2011 and Feb 2012, 55 days of data were collected. During this time, 80376 and 10416 electron antineutrino candidates were detected with 1545 and 515 expected background events at the near sites and the far site respectively. A rate-only analysis supports neutrino flavor oscillation with $\\sin^{2}2\\theta_{13} = 0.0936\\pm0.0172$ in a 2-neutrino mixing framework.","Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-05-16T19:55:39Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Thesis.zip: 46411794 bytes, checksum: d00fb366d0a6582c2176bc3112ebd0cd (MD5) Ngai_WahKai.pdf: 17386654 bytes, checksum: 30152c72e8f74d6e0a5592f9ef0ef1bc (MD5)","Made available in DSpace on 2012-09-18T21:08:17Z (GMT). No. of bitstreams: 3 Ngai_WahKai.pdf: 17386683 bytes, checksum: 3b1b6b1e90ca6293f0275f6345c43cf7 (MD5) license.txt: 4056 bytes, checksum: fc103dcdbd48b0563465b1510b890179 (MD5) Thesis.zip: 46411794 bytes, checksum: d00fb366d0a6582c2176bc3112ebd0cd (MD5)"],"dc:identifier":["http://hdl.handle.net/2142/34258"],"dc:language":["en"],"dc:rights":["Copyright 2012 Wah Kai Ngai"],"dc:subject":["neutrino","Mixing","angle","theta13","daya bay","reactor"],"dc:title":["Measurement of neutrino mixing angle Θ13 in the Daya Bay Reactor Neutrino Experiment"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:30Z"}