Measurement of the ${\nu }_e$ and Total ${}^8$B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase I Data Set

Abstract

This article provides the complete description of results from the Phase I data set of the Sudbury Neutrino Observatory (SNO). The Phase I data set is based on a 0.65 kt-year exposure of heavy water to the solar ${}^8$B neutrino flux. Included here are details of the SNO physics and detector model, evaluations of systematic uncertainties, and estimates of backgrounds. Also discussed are SNO's approach to statistical extraction of the signals from the three neutrino reactions (charged current, neutral current, and elastic scattering) and the results of a search for a day-night asymmetry in the ${\nu }_e$ flux. Under the assumption that the ${}^8$B spectrum is undistorted, the measurements from this phase yield a solar ${\nu }_e$ flux of $\varphi ({\nu }_e)=1.76_{-0.05}^{+0.05}{(stat.)}_{-0.09}^{+0.09}(syst.)\times 10^6$ cm${}^{-2}$ s${}^{-1}$, and a non-${\nu }_e$ component $\varphi ({\nu }_{\mu \tau })=3.41_{-0.45}^{+0.45}{(stat.)}_{-0.45}^{+0.48}(syst.)\times 10^6$ cm${}^{-2}$ s${}^{-1}$. The sum of these components provides a total flux in excellent agreement with the predictions of Standard Solar Models. The day-night asymmetry in the ${\nu }_e$ flux is found to be $A_e=7.0\pm 4.9(stat.{)}_{-1.2}^{+1.3}$, when the asymmetry in the total flux is constrained to be zero.

Complete (archival) version of SNO Phase I results. 78 pages, 46 figures, 34 tables

References in corpus (38)

• Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
• First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance
• Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
• Solar 8B and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data
• Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters
• Solar Models: current epoch and time dependences, neutrinos, and helioseismological properties
• Measurement of the Total Active 8B Solar Neutrino Flux at the Sudbury Neutrino Observatory with Enhanced Neutral Current Sensitivity
• Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations
• Measurement of the solar neutrino capture rate with gallium metal
• Electron Energy Spectra, Fluxes, and Day-Night Asymmetries of ${}^8$B Solar Neutrinos from the 391-Day Salt Phase SNO Data Set
• GNO Solar Neutrino Observations: Results for GNOI
• The Sudbury Neutrino Observatory
• Atmospheric neutrino flux above 1 GeV
• Standard Solar models in the Light of New Helioseismic Constraints II. Mixing Below the Convective Zone
• Neutrino magnetic moments, flavor mixing, and the SuperKamiokande solar data
• Neutrino-Deuteron Scattering in Effective Field Theory at Next-to-Next-to Leading Order
• Neutrino Reactions on Deuteron
• Neutrino-Nucleus Reactions
• Neutrino-deuteron reactions at solar neutrino energies
• Shape of the 8B Alpha and Neutrino Spectra
• Solar neutrinos: global analysis and implications for SNO
• Probability of a Solution to the Solar Neutrino Problem Within the Minimal Standard Model
• A simple analytic three-flavour description of the day-night effect in the solar neutrino flux
• Model Independent Determination of the Solar Neutrino Spectrum with and without MSW
• Analytical description of quasivacuum oscillations of solar neutrinos
• Radiative corrections in neutrino-deuterium disintegration
• Electron Antineutrino Search at the Sudbury Neutrino Observatory
• Solar neutrino interactions: Using charged currents at SNO to tell neutral currents at Super-Kamiokande
• The 16N Calibration Source for the Sudbury Neutrino Observatory
• SNO: Predictions for Ten Measurable Quantities
• A radium assay technique using hydrous titanium oxide adsorbent for the Sudbury Neutrino Observatory
• Measurement of radium concentration in water with Mn-coated beads at the Sudbury Neutrino Observatory
• Measurement of 222Rn dissolved in water at the Sudbury Neutrino Observatory
• Optical calibration hardware for the Sudbury Neutrino Observatory
• A Compact 3H(p,gamma)4He 19.8-MeV Gamma-Ray Source for Energy Calibration at the Sudbury Neutrino Observatory
• Solar neutrino event spectra: Tuning SNO to equalize Super-Kamiokande
• The 8Li Calibration Source for the Sudbury Neutrino Obervatory
• Solar Neutrino Interactions with 18O in SuperKamiokande

Cited by in corpus (84)

• From eV to EeV: Neutrino Cross Sections Across Energy Scales
• Precision measurement of the 7Be solar neutrino interaction rate in Borexino
• Sterile Neutrino Oscillations: The Global Picture
• New results on solar neutrino fluxes from 192 days of Borexino data
• Solar neutrino results in Super-Kamiokande-III
• Improved Measurement of Electron Antineutrino Disappearance at Daya Bay
• Independent Measurement of the Total Active 8B Solar Neutrino Flux Using an Array of 3He Proportional Counters at the Sudbury Neutrino Observatory
• Measurement of the solar 8B neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector
• Updated global fit to three neutrino mixing: status of the hints of theta13 > 0
• First evidence of pep solar neutrinos by direct detection in Borexino
• Low Energy Threshold Analysis of the Phase I and Phase II Data Sets of the Sudbury Neutrino Observatory
• Measurement of Neutrino-Electron Scattering Cross-Section with a CsI(Tl) Scintillating Crystal Array at the Kuo-Sheng Nuclear Power Reactor
• Sterile Neutrinos
• Neutrino Backgrounds to Dark Matter Searches
• Comparing Trimaximal Mixing and Its Variants with Deviations from Tri-bimaximal Mixing
• The SNO+ Experiment
• LUNA: a Laboratory for Underground Nuclear Astrophysics
• Curtailing the Dark Side in Non-Standard Neutrino Interactions
• Updated determination of the solar neutrino fluxes from solar neutrino data
• Pseudo-Dirac Neutrinos in the New Standard Model
• Robust Cosmological Bounds on Neutrinos and their Combination with Oscillation Results
• Solar neutrino spectrum, sterile neutrinos and additional radiation in the Universe
• Evaluation of Modern 3He(alpha,gamma)7Be Data
• Measurement of the 8B Solar Neutrino Flux with the KamLAND Liquid Scintillator Detector
• Directional Dark Matter Detection Beyond the Neutrino Bound
• The Sudbury Neutrino Observatory
• Perturbation Theory of Neutrino Oscillation with Nonstandard Neutrino Interactions
• Measurement of the ${\nu }_e$ and Total ${}^8$B Solar Neutrino Fluxes with the Sudbury Neutrino Observatory Phase-III Data Set
• High-Energy Astrophysics with Neutrino Telescopes
• Fast Neutron Detection with 6Li-loaded Liquid Scintillator
• Contrasting solar and reactor neutrinos with a non-zero value of theta13
• Search for invisible modes of nucleon decay in water with the SNO+ detector
• Characterization of a Li-6 loaded liquid organic scintillator for fast neutron spectrometry and thermal neutron detection
• Solar neutrino measurements using the full data period of Super-Kamiokande-IV
• Measurement of Radon Concentration in Super-Kamiokande's Buffer Gas
• Probing Nonstandard Neutrino Physics by Two Identical Detectors with Different Baselines
• MeV-scale performance of water-based and pure liquid scintillator detectors
• Measurement of the radon concentration in purified water in the Super-Kamiokande IV detector
• Patterns of flavor signals in supersymmetric models
• Direct determination of the solar neutrino fluxes from solar neutrino data
• Hint of non-standard dynamics in solar neutrino conversion
• Solar Neutrino Spectroscopy
• Search for $hep$ solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory
• Bayesian analysis of capture reactions ${}^3\mathrm{He}(\alpha ,\gamma {)}^7\mathrm{Be}$ and ${}^3\mathrm{H}(\alpha ,\gamma {)}^7\mathrm{Li}$
• Searches for High Frequency Variations in the ${}^8$B Solar Neutrino Flux at the Sudbury Neutrino Observatory
• Constraining Sterile Neutrino Cosmology with Terrestrial Oscillation Experiments
• Muon Capture on the Deuteron -- The MuSun Experiment
• Constraining New Physics with a Positive or Negative Signal of Neutrino-less Double Beta Decay
• A Search for Astrophysical Burst Signals at the Sudbury Neutrino Observatory
• Lorentz noninvariant oscillations of massless neutrinos are excluded
• Fast Neutron Detection with a Segmented Spectrometer
• Low Multiplicity Burst Search at the Sudbury Neutrino Observatory
• Neutrinos from Stored Muons nuSTORM: Expression of Interest
• Experimental results on neutrino oscillations
• The calibration of the Sudbury Neutrino Observatory using uniformly distributed radioactive sources
• Development and Characterization of a High Sensitivity Segmented Fast Neutron Spectrometer (FaNS-2)
• Reconstruction Algorithm for a Novel Cherenkov Scintillation Detector
• Probing the Sun's inner core using solar neutrinos: a new diagnostic method
• High sensitivity measurement of 224Ra and 226Ra in water with an improved hydrous titanium oxide technique at the Sudbury Neutrino Observatory
• Characterization of the Spontaneous Light Emission of the PMTs used in the Double Chooz Experiment
• Fundamental measurements with muons - View from PSI
• Detecting the Upturn of the Solar ${}^8$B Neutrino Spectrum with LENA
• Implications of the Super-K atmospheric data for the mixing angles ${\theta }_{13}$ and ${\theta }_{23}$
• Results from Super-Kamiokande
• Cosmogenic Neutron Production at the Sudbury Neutrino Observatory
• Gain fractions of future neutrino oscillation facilities over T2K and NOvA
• Recommended conventions for reporting results from direct dark matter searches
• Optical calibration of the SNO+ detector in the water phase with deployed sources
• Measurement of the high energy $\gamma$-rays from heavy ion reactions using Čerenkov detector
• New Prediction For Leptonic Theta_13
• Acquire information about neutrino parameters by detecting supernova neutrinos
• A Monte Carlo simulation of the Sudbury Neutrino Observatory proportional counters
• Delayed coincidence in electron-neutrino capture on gallium for neutrino spectroscopy
• Renaissance of the ~1 TeV Fixed-Target Program
• PEANUTS: a software for the automatic computation of solar neutrino flux and its propagation within Earth
• Combined effect of NSI and SFP on solar electron neutrino oscillation
• Directional Neutrino Searches for Galactic Center Dark Matter at Large Underground LArTPCs
• Solar Model Independent Constraints on the Sterile Neutrino Interpretation of the Gallium Anomaly
• Solar neutrino results from Borexino and main future perspectives
• Neutrino fluxes from CNO cycle in the Sun in the non stationary case with mixing
• Effect of the excited and fourth generation leptons in lepton flavor violating μ^{-} \to e^{-}2γdecay
• Calibration of Muon Reconstruction Algorithms Using an External Muon Tracking System at the Sudbury Neutrino Observatory
• Muon Capture on the Proton and Deuteron
• An array of low-background ${}^3$He proportional counters for the Sudbury Neutrino Observatory