The Sudbury Neutrino Observatory

The Sudbury Neutrino Observatory (SNO) was designed to solve the solar neutrino problem. It was a heavy water Cerenkov detector that had the unique ability to measure the total active flux of solar neutrinos, using a neutral current interaction, and the flux of electron neutrinos, using a charged current interaction.

The experiment demonstrated that neutrinos change flavor and that the total neutrino flux is consistent with the prediction of solar model. It showed that solar neutrino flavor change occurs within the Sun, via the MSW effect, and has made precision measurements of the solar sector neutrino oscillation parameters.

An excellent review article by Jelley, McDonald and Robertson describes the experiment in more detail. Or visit the experiment's home page.

The LBNL group took a leading role in constructing SNO and in data analysis. The group remains involved in data analysis, specifically in characterizing cosmogenic neutron production and searching for neutron anti-neutron oscillations.

Gallery

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Publications

K. Boudjemline et al.
The calibration of the Sudbury Neutrino Observatory using uniformly distributed radioactive sources
Nucl. Instr. Meth., A620, 171 (2010); arXiv:0912.2991 (2009)
B. Aharmim et al.
Low Energy Threshold Analysis of the Phase I and Phase II Data Sets of the Sudbury Neutrino Observatory
Submitted to Phys. Rev. C for publication (2009); arXiv:0910.2984 (2009)

B. Aharmim et al.
Searches for high frequency variations in the 8B solar neutrino flux at the Sudbury Neutrino Observatory.
Submitted to Astrophys. J. for publication (2009); arXiv:0910.2433 (2009)

B. Aharmim et al.
Measurement of the cosmic ray and neutrino-induced muon flux at the Sudbury Neutrino Observatory submitted to Phys. Rev. D (2009)
Accepted for publication by Phys. Rev. D (2009); arXiv:0902.2776 (2009)

B. Aharmim et al. (SNO collaboration)
An independent measurement of the total active 8B solar neutrino flux using an array of 3He proportional counters at the Sudbury Neutrino Observatory.
Phys. Rev. Lett. 101, 111301 (2008); arXiv:0806.0989 (2008)

J.F. Amsbaugh
An Array of Low-Background 3He Proportional Counters for the Sudbury Neutrino Observatory J.F. Amsbaugh et al.
arXiv:0610020 (2007)

B. Aharmim et al. (SNO collaboration)
A search for neutrinos from the solar hep reaction and the diffuse supernova neutrino back ground with the Sudbury Neutrino Observatory.
Astrophys. J. 653 (2006); arXiv:0607010 (2006)

B. Aharmim et al. (SNO collaboration)
Search for periodicities in the 8B solar neutrino flux measured by the Sudbury Neutrino Observatory.
Phys. Rev. D 72 (2005); arXiv:0507079 (2005)

B. Aharmim et al. (SNO collaboration)
Electron energy spectra, fluxes, and day-night asymmetries of 8B solar neutrinos from measurements with NaCl dissolved in the heavy-water detector at the Sudbury Neutrino Observatory.
Phys. Rev. C 72 (2005); arXiv:0502021 (2005)

B. Aharmim et al. (SNO collaboration)
Electron antineutrino search at the Sudbury Neutrino Observatory
Phys. Rev. D 70, 093014 (2004); arXiv:0407029 (2004)

S.N. Ahmed et al. (SNO collaboration
Measurement of the total active 8B solar neutrino flux at the Sudbury Neutrino Observatory with enhanced neutral current sensitivity
Phys. Rev. Lett., 92, 181301 (2004); arXiv:0309004 (2003)

S.N. Ahmed et al.
Constraints on nucleon decay via 'invisible' modes from the Sudbury Neutrino Observatory
Phys. Rev. Lett., 92, 102004 (2004); arXiv:0310030 (2004)

Q.R. Ahmad et al.
Measurement of day and night neutrino energy spectra at SNO and constraints on neutrino mixing parameters
Phys. Rev. Lett,. 89, 011302 (2002); arXiv:0204009 (2002)

Q.R. Ahmad et al.
Direct evidence for neutrino flavor transformation from neutral-current interactions in the Sudbury Neutrino Observatory
Phys. Rev. Lett., 89, 011301 (2002); arXiv:0204008 (2002)

Q.R. Ahmad et al.
Measurement of the νe+d>p+p+e- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
Phys. Rev. Lett., 87, 071301 (2001); arXiv:0106016 (2001)

A.W.P. Poon et al.
A Compact 3H(p,γ)4He 19.8-MeV gamma-ray source for energy calibration at the Sudbury Neutrino Observatory
Nucl. Instr. Meth., A452, 115 (2000); arXiv:9910011 (2000)

J. Boger et al.
The Sudbury Neutrino Observatory
Nucl. Instr. Meth., A449, 172 (2000); arXiv:9910016 (1999)

M.C. Browne et al.
Low-background 3He proportional counters for use in the Sudbury Neutrino Observatory
IEEE Trans. Nucl. Sci., 46, 873 (1999)