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dc.contributor.authorLam, Ianen
dc.date.accessioned2020-10-28T21:00:05Z
dc.date.available2020-10-28T21:00:05Z
dc.identifier.urihttp://hdl.handle.net/1974/28238
dc.description.abstractThe water phase of the SNO+ (Sudbury Neutrino Observatory) experiment has completed after the collection of ~305 days of total livetime worth of data, divided into two main sets. The effective concentration of U-238 and Th-232 in the water was determined using in situ analysis to be, for the second set of data, gU/gH2O: (3.64 +/- 0.74_(stat) + 1.28_(syst) - 0.99_(syst) x 10^-15 and gTh/gH2O: (3.08 +/- 3.22_(stat) + 1.60_(syst) - 5.00_(syst) ) x 10^-16. The water data can also been used to search for ``invisible" modes of nucleon decay, and a previous SNO+ publication set world-leading limits on relevant nucleon and dinucleon decay modes except neutron and dineutron decay. This thesis presents a re-analysis of the ``invisible" neutron decay mode of that first set of data, which reoptimizes the fiducial volume and develops an improved treatment of the dominant energy systematic uncertainties. This leads to a world-leading lower limit on the ``invisible" neutron decay lifetime of 6.91 x 10^29 years. A sensitivity analysis shows that including the second set of data that has lower backgrounds is expected to yield a lower limit on the neutron decay lifetime of 1.57 x 10^30 years, further improving the result.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.rightsAttribution 3.0 United States*
dc.subjectSNO+en
dc.subjectnucleon decayen
dc.titleSearch For Invisible Nucleon Decay in SNO+ With Improved Sensitivityen
dc.typethesisen
dc.description.degreePhDen
dc.contributor.supervisorWright, Alexander
dc.contributor.departmentPhysics, Engineering Physics and Astronomyen
dc.embargo.termsI would like to restrict my thesis for 6 months due to it being in preparation for publication.en
dc.embargo.liftdate2025-10-28T17:25:17Z
dc.embargo.liftdate2025-10-28T20:21:40Z
dc.degree.grantorQueen's University at Kingstonen


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