Neutrino observations from the Sudbury Neutrino Observatory
The Sudbury Neutrino Observatory (SNO) is a water imaging Cherenkov detector. Its usage of 1000 metric tons of D{sub 2}O as target allows the SNO detector to make a solar-model independent test of the neutrino oscillation hypothesis by simultaneously measuring the solar {nu}{sub e} flux and the total flux of all active neutrino species. Solar neutrinos from the decay of {sup 8}B have been detected at SNO by the charged-current (CC) interaction on the deuteron and by the elastic scattering (ES) of electrons. While the CC reaction is sensitive exclusively to {nu}{sub e}, the ES reaction also has a small sensitivity to {nu}{sub {mu}} and {nu}{sub {tau}}. In this paper, recent solar neutrino results from the SNO experiment are presented. It is demonstrated that the solar flux from {sup 8}B decay as measured from the ES reaction rate under the no-oscillation assumption is consistent with the high precision ES measurement by the Super-Kamiokande experiment. The {nu}{sub e} flux deduced from the CC reaction rate in SNO differs from the Super-Kamiokande ES results by 3.3{sigma}. This is evidence for an active neutrino component, in additional to {nu}{sub e}, in the solar neutrino flux. These results also allow the first experimental determination of the total active {sup 8}B neutrino flux from the Sun, and is found to be in good agreement with solar model predictions.
- Research Organization:
- COLLABORATION - Sudbury Neutrino ObservatoryCollaboration
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 892202
- Report Number(s):
- LBNL-50719; R&D Project: NSNO; BnR: KB0401022; TRN: US0605563
- Resource Relation:
- Conference: International Nuclear Physics Conference 2001,Berkeley, CA, 2001
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHERENKOV COUNTERS
DECAY
DEUTERONS
ELASTIC SCATTERING
ELECTRONS
METRICS
NEUTRINO OSCILLATION
NEUTRINOS
NUCLEAR PHYSICS
REACTION KINETICS
SENSITIVITY
SOLAR FLUX
SOLAR NEUTRINOS
STAR MODELS
SUDBURY NEUTRINO OBSERVATORY
SUN
TARGETS
solar neutrinos Sudbury Neutrino Observatory