Evidence for neutrino oscillations in the Sudbury Neutrino Observatory

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The Sudbury Neutrino Observatory (SNO) is a large-volume heavy water Cerenkov detector designed to resolve the solar neutrino problem. SNO observes charged-current interactions with electron neutrinos, neutral-current interactions with all active neutrinos, and elastic-scattering interactions primarily with electron neutrinos with some sensitivity to other flavors. This dissertation presents an analysis of the solar neutrino flux observed in SNO in the second phase of operation, while {approx}2 tonnes of salt (NaCl) were dissolved in the heavy water. The dataset here represents 391 live days of data. Only the events above a visible energy threshold of 5.5 MeV and inside a fiducial ... continued below

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224 pages

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Marino, Alysia Diane August 10, 2004.

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The Sudbury Neutrino Observatory (SNO) is a large-volume heavy water Cerenkov detector designed to resolve the solar neutrino problem. SNO observes charged-current interactions with electron neutrinos, neutral-current interactions with all active neutrinos, and elastic-scattering interactions primarily with electron neutrinos with some sensitivity to other flavors. This dissertation presents an analysis of the solar neutrino flux observed in SNO in the second phase of operation, while {approx}2 tonnes of salt (NaCl) were dissolved in the heavy water. The dataset here represents 391 live days of data. Only the events above a visible energy threshold of 5.5 MeV and inside a fiducial volume within 550 cm of the center of the detector are studied. The neutrino flux observed via the charged-current interaction is [1.71 {+-} 0.065(stat.){+-}{sub 0.068}{sup 0.065}(sys.){+-}0.02(theor.)] x 10{sup 6}cm{sup -2}s{sup -1}, via the elastic-scattering interaction is [2.21{+-}0.22(stat.){+-}{sub 0.12}{sup 0.11}(sys.){+-}0.01(theor.)] x 10{sup 6}cm{sup -2}s{sup -1}, and via the neutral-current interaction is [5.05{+-}0.23(stat.){+-}{sub 0.37}{sup 0.31}(sys.){+-}0.06(theor.)] x 10{sup 6}cm{sup -2}s{sup -1}. The electron-only flux seen via the charged-current interaction is more than 7{sigma} below the total active flux seen via the neutral-current interaction, providing strong evidence that neutrinos are undergoing flavor transformation as they travel from the core of the Sun to the Earth. The most likely origin of the flavor transformation is matter-induced flavor oscillation.

Physical Description

224 pages

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INIS; OSTI as DE00834273

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  • Other Information: TH: Thesis (Ph.D.); Doctoral Thesis, PHD, submitted to the University of California at Berkeley, Berkeley, CA (US)

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  • Report No.: LBNL--56162
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 834273
  • Archival Resource Key: ark:/67531/metadc780875

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 10, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Sept. 1, 2016, 6:59 p.m.

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Marino, Alysia Diane. Evidence for neutrino oscillations in the Sudbury Neutrino Observatory, thesis or dissertation, August 10, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc780875/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.