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Title: Evidence for neutrino oscillations in the Sudbury Neutrino Observatory

Abstract

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 ~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.)±$$0.065\atop{0.068}$$(sys.)±0.02(theor.)] x 10 6cm -2s -1, via the elastic-scattering interaction is [2.21±0.22(stat.)±$$0.12\atop{0.11}$$(sys.)±0.01(theor.)] x 10 6cm -2s -1, and via the neutral-current interaction is [5.05±0.23(stat.)±$$0.31\atop{0.37}$$(sys.)±0.06(theor.)] x 10 6cm -2s -1. The electron-only flux seen via the charged-current interaction is more than 7σ 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.

Authors:
 [1]
  1. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
834273
Report Number(s):
LBNL-56162
R&D Project: NSNO; TRN: US0407089
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (Ph.D.); Doctoral Thesis, PHD, submitted to the University of California at Berkeley, Berkeley, CA (US); PBD: 10 Aug 2004
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CHARGED-CURRENT INTERACTIONS; ELASTIC SCATTERING; ELECTRON NEUTRINOS; HEAVY WATER; NEUTRAL-CURRENT INTERACTIONS; NEUTRINO OSCILLATION; NEUTRINOS; ORIGIN; SENSITIVITY; SOLAR NEUTRINOS; SUDBURY NEUTRINO OBSERVATORY; TRANSFORMATIONS; NEUTRINO OSCILLATIONS

Citation Formats

Marino, Alysia Diane. Evidence for neutrino oscillations in the Sudbury Neutrino Observatory. United States: N. p., 2004. Web. doi:10.2172/834273.
Marino, Alysia Diane. Evidence for neutrino oscillations in the Sudbury Neutrino Observatory. United States. doi:10.2172/834273.
Marino, Alysia Diane. Thu . "Evidence for neutrino oscillations in the Sudbury Neutrino Observatory". United States. doi:10.2172/834273. https://www.osti.gov/servlets/purl/834273.
@article{osti_834273,
title = {Evidence for neutrino oscillations in the Sudbury Neutrino Observatory},
author = {Marino, Alysia Diane},
abstractNote = {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 ~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.)±$0.065\atop{0.068}$(sys.)±0.02(theor.)] x 106cm-2s-1, via the elastic-scattering interaction is [2.21±0.22(stat.)±$0.12\atop{0.11}$(sys.)±0.01(theor.)] x 106cm-2s-1, and via the neutral-current interaction is [5.05±0.23(stat.)±$0.31\atop{0.37}$(sys.)±0.06(theor.)] x 106cm-2s-1. The electron-only flux seen via the charged-current interaction is more than 7σ 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.},
doi = {10.2172/834273},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {1}
}

Thesis/Dissertation:
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