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1. Current Status and Future Prospects of the SNO+ Experiment

Author

S. Andringa, E. Arushanova, S. Asahi, M. Askins, D. J. Auty, A. R. Back, Z. Barnard, N. Barros, E. W. Beier, A. Bialek, S. D. Biller, E. Blucher, R. Bonventre, D. Braid, E. Caden, E. Callaghan, J. Caravaca, J. Carvalho, L. Cavalli, D. Chauhan, M. Chen, O. Chkvorets, K. Clark, B. Cleveland, I. T. Coulter, D. Cressy, X. Dai, C. Darrach, B. Davis-Purcell, R. Deen, M. M. Depatie, F. Descamps, F. Di Lodovico, N. Duhaime, F. Duncan, J. Dunger, E. Falk, N. Fatemighomi, R. Ford, P. Gorel, C. Grant, S. Grullon, E. Guillian, A. L. Hallin, D. Hallman, S. Hans, J. Hartnell, P. Harvey, M. Hedayatipour, W. J. Heintzelman, R. L. Helmer, B. Hreljac, J. Hu, T. Iida, C. M. Jackson, N. A. Jelley, C. Jillings, C. Jones, P. G. Jones, K. Kamdin, T. Kaptanoglu, J. Kaspar, P. Keener, P. Khaghani, L. Kippenbrock, J. R. Klein, R. Knapik, J. N. Kofron, L. L. Kormos, S. Korte, C. Kraus, C. B. Krauss, K. Labe, I. Lam, C. Lan, B. J. Land, S. Langrock, A. LaTorre, I. Lawson, G. M. Lefeuvre, E. J. Leming, J. Lidgard, X. Liu, Y. Liu, V. Lozza, S. Maguire, A. Maio, K. Majumdar, S. Manecki, J. Maneira, E. Marzec, A. Mastbaum, N. McCauley, A. B. McDonald, J. E. McMillan, P. Mekarski, C. Miller, Y. Mohan, E. Mony, M. J. Mottram, V. Novikov, H. M. O’Keeffe, E. O’Sullivan, G. D. Orebi Gann, M. J. Parnell, S. J. M. Peeters, T. Pershing, Z. Petriw, G. Prior, J. C. Prouty, S. Quirk, A. Reichold, A. Robertson, J. Rose, R. Rosero, P. M. Rost, J. Rumleskie, M. A. Schumaker, M. H. Schwendener, D. Scislowski, J. Secrest, M. Seddighin, L. Segui, S. Seibert, T. Shantz, T. M. Shokair, L. Sibley, J. R. Sinclair, K. Singh, P. Skensved, A. Sörensen, T. Sonley, R. Stainforth, M. Strait, M. I. Stringer, R. Svoboda, J. Tatar, L. Tian, N. Tolich, J. Tseng, H. W. C. Tseung, R. Van Berg, E. Vázquez-Jáuregui, C. Virtue, B. von Krosigk, J. M. G. Walker, M. Walker, O. Wasalski, J. Waterfield, R. F. White, J. R. Wilson, T. J. Winchester, A. Wright, M. Yeh, T. Zhao, and K. Zuber

Subjects
Physics, QC1-999
Abstract

SNO+ is a large liquid scintillator-based experiment located 2 km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of a 12 m diameter acrylic vessel which will be filled with about 780 tonnes of ultra-pure liquid scintillator. Designed as a multipurpose neutrino experiment, the primary goal of SNO+ is a search for the neutrinoless double-beta decay (0νββ) of 130Te. In Phase I, the detector will be loaded with 0.3% natural tellurium, corresponding to nearly 800 kg of 130Te, with an expected effective Majorana neutrino mass sensitivity in the region of 55–133 meV, just above the inverted mass hierarchy. Recently, the possibility of deploying up to ten times more natural tellurium has been investigated, which would enable SNO+ to achieve sensitivity deep into the parameter space for the inverted neutrino mass hierarchy in the future. Additionally, SNO+ aims to measure reactor antineutrino oscillations, low energy solar neutrinos, and geoneutrinos, to be sensitive to supernova neutrinos, and to search for exotic physics. A first phase with the detector filled with water will begin soon, with the scintillator phase expected to start after a few months of water data taking. The 0νββ Phase I is foreseen for 2017.

Published
2016
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2. Search for hep solar neutrinos and the diffuse supernova neutrino background using all three phases of the Sudbury Neutrino Observatory

Author

C. E. Okada, Ilan Levine, David A. Sinclair, D. Chauhan, J. Wendland, J. F. Wilkerson, B. Beltran, F. B. Descamps, Jocelyn Monroe, M. H. Schwendener, N. Gagnon, M. Jerkins, T. Sonley, F. Zhang, N. S. Oblath, G. D. Orebi Gann, H. Deng, B. Aharmim, J. R. Leslie, L. C. Stonehill, R. W. Ollerhead, J. Law, A. L. Hallin, B. T. Cleveland, B. C. Robertson, E. Blucher, Bei Cai, Ryuta Hazama, G. Doucas, K. Boudjemline, N. Tolich, M. Huang, H. Wan Chan Tseung, S. Habib, S. Majerus, Yuen-Dat Chan, K. Graham, T. Kutter, T. J. Winchester, Alain Bellerive, D. L. Wark, M. L. Miller, J. Heise, S. M. Oser, M. Bergevin, L. L. Kormos, R. D. Martin, Andrew Hime, N. McCauley, P. Jagam, S. R. Elliott, G. T. Ewan, C. Kraus, A. Krüger, Keith Rielage, R. G. H. Robertson, S. D. Reitzner, S. N. Ahmed, M. Kos, J. C. Loach, O. Simard, R. Van Berg, P. L. Drouin, K. Gilje, R. L. Hahn, I. Lawson, R. J. Ford, Monica Dunford, C. J. Virtue, E. W. Beier, A. J. Noble, J. Maneira, A. W. P. Poon, J. Caravaca, F. Fleurot, B. L. Wall, A. E. Anthony, Christopher C. M. Kyba, P. J. Doe, G. Prior, N. West, W. J. Heintzelman, Hal Evans, S. J. M. Peeters, C. Howard, J. Farine, H. M. O'Keeffe, K. T. Lesko, S. D. Biller, R. A. Ott, Bernie G. Nickel, P. J. Harvey, Jochen Klein, K. J. Keeter, E. Guillian, H. B. Mak, Minfang Yeh, G. Tešić, N. A. Jelley, S. McGee, J. Tm. Goon, N. Barros, A. B. McDonald, E. D. Hallman, R. MacLellan, T. Tsui, S. R. Seibert, Min Chen, C. B. Krauss, B. A. VanDevender, P. Skensved, D. Waller, B. Jamieson, R. Bonventre, James R. Wilson, B. J. Land, X. Dai, J. A. Secrest, J. A. Detwiler, G. A. Cox, R. Lange, Benjamin Monreal, A. Mastbaum, H. Fergani, R. L. Helmer, Kai Zuber, A. Wright, M. G. Boulay, A. LaTorre, E. J. Callaghan, K. Labe, and Joseph A. Formaggio

Subjects
Physics, Standard solar model, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Supernova, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Neutrino, 010306 general physics, Nuclear Experiment
Abstract

A search has been performed for neutrinos from two sources, the $hep$ reaction in the solar $pp$ fusion chain and the $��_e$ component of the diffuse supernova neutrino background (DSNB), using the full dataset of the Sudbury Neutrino Observatory with a total exposure of 2.47 kton-years after fiducialization. The $hep$ search is performed using both a single-bin counting analysis and a likelihood fit. We find a best-fit flux that is compatible with solar model predictions while remaining consistent with zero flux, and set a one-sided upper limit of $��_{hep} < 30\times10^{3}~\mathrm{cm}^{-2}~\mathrm{s}^{-1}$ [90% credible interval (CI)]. No events are observed in the DSNB search region, and we set an improved upper bound on the $��_e$ component of the DSNB flux of $��^\mathrm{DSNB}_{��_e} < 19~\textrm{cm}^{-2}~\textrm{s}^{-1}$ (90% CI) in the energy range $22.9 < E_��< 36.9$~MeV., 11 pages, 6 figures

Published
2020

3. Neutral current and day night measurements from the pure D2O phase of SNO

Author

B. C. Robertson, J. R. Leslie, M. Dunford, Eric B. Norman, J. B. Wilhelmy, T. Kutter, J. Manor, J. Farine, S. D. Biller, C. W. Nally, T. V. Bullard, A. S. Hamer, D. R. Grant, Guthrie Miller, S. J. Brice, James R. Wilson, E. W. Beier, P. J. Harvey, J. Cameron, C. E. Okada, J. F. Wilkerson, E. D. Hallman, X. Chen, W. J. Heintzelman, S. R. Elliott, R. G. Stokstad, David A. Sinclair, J. A. Formaggio, P. Jagam, Reda Tafirout, Christopher C. M. Kyba, M. W. Smith, C. J. Virtue, Ilan Levine, H. B. Mak, R. G. Van de Water, N. Starinsky, G. Doucas, P. Skensved, G. T. Ewan, K. K. Schaffer, G. A. Cox, K. Kazkaz, M. M. Fowler, F. Dalnoki-Veress, M. G. Bowler, C. K. Hargrove, K. Graham, S. M. Oser, P. T. Keener, S. S.E. Rosendahl, S. Majerus, John L. Orrell, Hal Evans, W. Frati, S. Luoma, B. T. Cleveland, W. B. Handler, D. L. Wark, K. T. Lesko, N. Tagg, E. D. Earle, N. Gagnon, Y.D. Chan, K. M. Heeger, A. Hime, Mark Guy Boulay, X. Dai, J. J. Simpson, R. L. Hahn, R. Hazama, Minfang Yeh, J. A. Dunmore, N. A. Jelley, K. Frame, A. L. Hallin, M. Howe, J. M. Wouters, Peter Wittich, A. B. McDonald, N. McCauley, A. D. Marino, R. Van Berg, H. Fergani, M. L. Chen, I. Lawson, A. J. Noble, Jochen Klein, V. L. Rusu, J. Maneira, A. W. P. Poon, F. A. Duncan, R. G. H. Robertson, M. R. Dragowsky, T. Spreitzer, T.J. Bowles, G. McGregor, Chris Waltham, L. C. Stonehill, R. L. Helmer, M. H. Schwendener, J. Law, C. J. Sims, J. Heise, C. A. Duba, N. West, and P. J. Doe

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Solar neutrino, Atomic and Molecular Physics, and Optics, Massless particle, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Nuclear Experiment, Charged current, Lepton
Abstract

The Sudbury Neutrino Observatory is a 1000 T D 2 O Cerenkov detector that is sensitive to 8 B solar neutrinos. The energy, radius, and direction with respect to the sun is measured for each neutrino event; these distributions are used to separately determine the rates of the charged current, neutral current and electron scattering reactions of neutrinos on deuterium. Assuming an undistorted 8 B spectrum, the ν e component of the 8 B solar flux is φ e = 1.76 +0.05 −0.05 (stat.) +0.09 −0.09 (syst.) × 10 6 cm −2 s −1 based on events with a measured kinetic enegy above 5 MeV. The non- ν e component is φ μτ = 3.41 +0.45 −0.45 (stat.) +0.48 −0.45 (syst.) × 10 6 cm −2 s −1 , 5.3 σ greater than zero, providing strong evidence for solar ν e flavor transformation. The total flux measured with the NC reaction is φ NC = 5.09 +0.044 −0.43 (stat.) +0.46 −0.43 (syst.) × 10 6 cm −2 s −1 , consistent with solar models. The night minus day rate is 14.0% ± 6.3% +1.5 −1.4 % of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the ν e asymmetry is found to be 7.0% ± 4.9% +1.3 −1.2 %. A global solar neutrino analysis is terms of matter-enhanced oscillations of two active flavors strongly favors the Large Mixing Angle (LMA) solution.

Published
2016
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4. The calibration of the Sudbury Neutrino Observatory using uniformly distributed radioactive sources

Author

I. T. Lawson, Joshua R. Klein, K. J. Keeter, A. L. Hallin, R. Ford, E. Guillian, C. B. Krauss, M. J. Thomson, Keith Rielage, B. T. Cleveland, R. G. H. Robertson, P. Skensved, V. l. Rusu, J. C. Loach, Bei Cai, N. A. Jelley, K. Boudjemline, H. M. O'Keeffe, C. Howard, J. Farine, E. D. Hallman, A. J. Noble, P. Jagam, S. D. Reitzner, S. J. M. Peeters, C. Kraus, Alan Poon, R. Lange, Hal Evans, G. T. Ewan, G. McGregor, A. B. McDonald, and S. R. Seibert

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Proportional counter, FOS: Physical sciences, 01 natural sciences, Nuclear physics, Neutrino detector, 13. Climate action, 0103 physical sciences, Neutron detection, Neutron, Neutrino, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Cherenkov radiation
Abstract

The production and analysis of distributed sources of 24Na and 222Rn in the Sudbury Neutrino Observatory (SNO) are described. These unique sources provided accurate calibrations of the response to neutrons, produced through photodisintegration of the deuterons in the heavy water target, and to low energy betas and gammas. The application of these sources in determining the neutron detection efficiency and response of the 3He proportional counter array, and the characteristics of background Cherenkov light from trace amounts of natural radioactivity is described., Comment: 24 pages, 13 figures

Published
2016
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5. Constraints on nucleon decay via invisible modes from the Sudbury Neutrino Observatory

Author

X. Chen, H. Wan Chan Tseung, H. Labranche, D. L. Wark, F. Dalnoki-Veress, A. D. Marino, B. C. Robertson, N. McCauley, R. L. Helmer, G. Doucas, R. Van Berg, R. G. H. Robertson, J. B. Wilhelmy, T. Kutter, M. G. Bowler, I. Levine, M. L. Chen, Monica Dunford, S. S.E. Rosendahl, Chris Waltham, C. J. Virtue, S. J. Brice, A. W. P. Poon, J. A. Dunmore, R. L. Hahn, R. W. Ollerhead, C. W. Nally, G. McGregor, P. Jagam, K.K.S. Miknaitis, J. M. Wouters, S. Majerus, P. Skensved, X. Dai, J. F. Wilkerson, R. G. Van de Water, Joshua R. Klein, N. Gagnon, Reda Tafirout, N. Starinsky, Darren Grant, Alain Bellerive, R. S. Dosanjh, R. Lange, Mark Neubauer, W. Frati, S. N. Ahmed, R. Hazama, E. D. Earle, E. Rollin, W. B. Handler, H. B. Mak, T. J. Bowles, Andrew Hime, J. R. Wilson, Guthrie Miller, M. W.E. Smith, F. A. Duncan, M. A. Howe, A. B. McDonald, Christopher C. M. Kyba, R. MacLellan, M. A. Thomson, J. Heise, S. D. Biller, J. R. Leslie, B. A. Moffat, Bernie G. Nickel, J. Boger, F. Fleurot, M. H. Schwendener, B. T. Cleveland, Malcolm M. Fowler, N. S. Oblath, A. E. Anthony, N. West, A. V. Krumins, C. A. Duba, S. Luoma, Joseph A. Formaggio, C. Ouellet, Minfang Yeh, C. E. Okada, P. J. Harvey, W. J. Heintzelman, S. R. Elliott, O. Simard, David A. Sinclair, G. T. Ewan, I. T. Lawson, G. Tešić, A. L. Hallin, C. Mifflin, S. J. M. Peeters, N. A. Jelley, M. Thorman, D. Waller, V. L. Rusu, J. C. Hall, J. Law, M. R. Dragowsky, G. A. Cox, K. T. Lesko, L. C. Stonehill, J. Farine, C. J. Sims, C. K. Hargrove, A. J. Noble, T. V. Bullard, R. J. Hemingway, Kai Zuber, H. Fergani, J. Maneira, M. Kos, A. S. Hamer, Hal Evans, E. W. Beier, S. McGee, R. G. Stokstad, B. L. Wall, Peter Wittich, Eric B. Norman, E. D. Hallman, P. J. Doe, Y. Takeuchi, J. J. Simpson, Yuen-Dat Chan, K. Graham, S. M. Oser, M.G. Boulay, B. G. Fulsom, K. Frame, K. M. Heeger, and John L. Orrell

Subjects
Physics, Sudbury Neutrino Observatory, Particle physics, Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, FOS: Physical sciences, General Physics and Astronomy, Elementary particle, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Baryon, High Energy Physics - Experiment (hep-ex), Particle decay, 0103 physical sciences, Neutron, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment
Abstract

Data from the Sudbury Neutrino Observatory have been used to constrain the lifetime for nucleon decay to ``invisible'' modes, such as n -> 3 nu. The analysis was based on a search for gamma-rays from the de-excitation of the residual nucleus that would result from the disappearance of either a proton or neutron from O16. A limit of tau_inv > 2 x 10^{29} years is obtained at 90% confidence for either neutron or proton decay modes. This is about an order of magnitude more stringent than previous constraints on invisible proton decay modes and 400 times more stringent than similar neutron modes., Update includes missing efficiency factor (limits change by factor of 2) Submitted to Physical Review Letters

Published
2016
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6. FOCAL PLANE DETECTOR FOR THE OXFORD MDM-2 SPECTROMETER

Author

W.N. Catford, J.S. Winfield, N. A. Jelley, K.W. Allen, D.M. Pringle, and D.G. Lewis

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, business.industry, Capacitive sensing, Detector, Cardinal point, Optics, Interference (communication), Ionization, Ionization chamber, business, Instrumentation, Noise (radio)
Abstract

A “hybrid” focal plane counter comprising a gridded ionization chamber with position sensitive proportional counters, 300 mm long, 510 mm deep and with an active height of 60 mm, is described. The detector is designed for use with the Oxford MDM-2 magnetic spectrometer and is suitable for both light and heavy ions. Typical results obtained are 0.6 mm position resolution and 1% total energy resolution. Two energy loss, a veto and two position signals are available as well as provision for height and timing signals. Techniques are described for the reduction of capacitive noise, correction of electric field nonuniformities, and the reduction of interference from positive ions on the ionization signals.

Published
2016

7. Calibration of the Neutral Current Detection Array in the SNO experiment

Author

B. T. Cleveland, C. Kraus, G. Prior, G. A. Cox, A. L. Hallin, C. B. Krauss, J. Wendland, J. Law, Keith Rielage, S. McGee, M. Di Marco, J. C. Loach, N. A. Jelley, S. J. M. Peeters, P. Skensved, M. Huang, C. Howard, D. Reitzner, H.M. OʼKeeffe, E. Guillian, and Hal Evans

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Photomultiplier, Neutral current, Physics::Instrumentation and Detectors, business.industry, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, Phase (waves), Atomic and Molecular Physics, and Optics, law.invention, Nuclear physics, Optics, law, Calibration, High Energy Physics::Experiment, Neutron, business
Abstract

Since November 25th, 2004, the Sudbury Neutrino Observatory has been taking production data in its third and final phase. For this phase a 'Neutral-Current Detection (NCD) Array', consisting of 36 strings of 3He proportional counters and 4 strings of 4He proportional counters, was deployed in SNO's D 2O volume. It supplements the Cherenkov detector, consisting of 9456 photomultiplier tubes, present in the previous two phases by offering an independent measurement of the solar neutral current rate. The 3He counters detect neutrons from neutrino-deuteron neutral current interactions in the D 2O. We describe the calibration of this array. © 2011.

Published
2016
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8. PREPARATION OF THIN-FILM TRITIUM SOURCES FOR DETERMINATION OF THE NEUTRINO MASS

Author

P.A. Holmes, S.S. Williams, R. Alizadeh, and N. A. Jelley

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Deposition (phase transition), Tritium, Thin film, Neutrino, Instrumentation
Abstract

Very thin tritium sources have been prepared, using the Langmuir-Blodgett technique of multilayer deposition, for the determination of the neutrino mass. The method of manufacture of these tritium sources is described.

Published
2016
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9. LAMB SHIFT AND FINE-STRUCTURE IN 1S3SS-3-1S3PP-3 TRANSITIONS IN HELIUM-LIKE OXYGEN

Author

J. D. Silver, N A Jelley, R O'Brien, E. G. Myers, I A Armour, and S Bashkin

Subjects
Physics, chemistry.chemical_element, Oxygen, Atomic and Molecular Physics, and Optics, Lamb shift, symbols.namesake, Wavelength, chemistry, symbols, Physics::Accelerator Physics, Physics::Atomic Physics, Atomic physics, Grating spectrometer, Doppler effect, Helium, Beam (structure)
Abstract

The 33S1-33P0,1,2 transitions in helium-like oxygen have been observed in a foil-excited beam using a 'Doppler cancellation' light-enhancement technique applied to a grating spectrometer. The wavelengths of these transitions were measured at oxygen beam energies of 13.5, 18.0 and 23.5 MeV. The results are compared with calculations of the fine-structure splitting and with estimates of the Lamb shift of the 3 3S and 33P levels.

Published
2016

10. SEARCHES FOR HIGH-FREQUENCY VARIATIONS IN THE B-8 SOLAR NEUTRINO FLUX AT THE SUDBURY NEUTRINO OBSERVATORY

Author

E. D. Hallman, G. Prior, Benjamin Monreal, E. D. Earle, P. J. Doe, S. J. M. Peeters, K. J. Keeter, T. Tsui, F. A. Duncan, P. Skensved, M. DiMarco, K. Boudjemline, Yuen-Dat Chan, J. M. Wouters, J. Heise, S. Habib, K. Graham, X. Dai, S. M. Oser, J. A. Detwiler, Keith Rielage, H. Wan Chan Tseung, M. L. Miller, A. B. McDonald, R. D. Martin, Andrew Hime, I. Levine, Jocelyn Monroe, Alain Bellerive, D. L. Wark, R. J. Ford, T. J. Sonley, R. L. Hahn, H. Fergani, R. G. H. Robertson, M. H. Schwendener, R. MacLellan, Monica Dunford, J. Maneira, B. Beltran, Mark Guy Boulay, Bei Cai, David A. Sinclair, C. A. Duba, F. Zhang, J. Law, D. Chauhan, Peter Watson, B. Jamieson, A. W. P. Poon, Christopher C. M. Kyba, P.-L. Drouin, N. Tolich, C. B. Krauss, N. S. Oblath, B. Aharmim, T.H. Burritt, Kai Zuber, C. D. Tunnell, A. L. Hallin, R. L. Helmer, B. Morissette, J. A. Secrest, I. T. Lawson, C. Kraus, B. T. Cleveland, S. R. Seibert, D. Waller, G. A. Cox, R. A. Ott, N. West, W. J. Heintzelman, K. T. Lesko, J. R. Wilson, M. Kos, A. Wright, O. Simard, E. W. Beier, B.A. VanDevender, L. C. Stonehill, C. Howard, J. Farine, A. J. Noble, C. J. Virtue, B. C. Robertson, G. Doucas, E. Guillian, T. Kutter, N. Barros, Joseph A. Formaggio, Minfang Yeh, J. C. Loach, N. A. Jelley, Hal Evans, S. D. Reitzner, S. N. Ahmed, Joshua R. Klein, M. Bergevin, N. McCauley, R. Van Berg, M. L. Chen, S. Majerus, L. L. Kormos, G. T. Ewan, N. Gagnon, R. Hazama, G. D. Orebi Gann, H. Deng, B. L. Wall, H. M. O'Keeffe, H. B. Mak, S. McGee, S. D. Biller, Bernie G. Nickel, P. J. Harvey, J. F. Wilkerson, Steven Elliott, M. A. Howe, M. Huang, G. Tešić, J. R. Leslie, F. Fleurot, A. E. Anthony, and J. Tm. Goon

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, FOS: Physical sciences, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Observatory, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Nuclear Experiment (nucl-ex), 010303 astronomy & astrophysics, Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Sudbury Neutrino Observatory, Solar observatory, 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysics, Solar neutrino problem, Neutrino detector, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Physics::Space Physics, Measurements of neutrino speed, Neutrino
Abstract

We have performed three searches for high-frequency signals in the solar neutrino flux measured by the Sudbury Neutrino Observatory (SNO), motivated by the possibility that solar $g$-mode oscillations could affect the production or propagation of solar $^8$B neutrinos. The first search looked for any significant peak in the frequency range 1/day to 144/day, with a sensitivity to sinusoidal signals with amplitudes of 12% or greater. The second search focused on regions in which $g$-mode signals have been claimed by experiments aboard the SoHO satellite, and was sensitive to signals with amplitudes of 10% or greater. The third search looked for extra power across the entire frequency band. No statistically significant signal was detected in any of the three searches., 37 pages, 17 figures, submitted to ApJ

Published
2016
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11. Measurement of dissolved in water at the Sudbury Neutrino Observatory

Author

M. Liu, H.W. Lee, K. McFarlane, I. Blevis, R. L. Hahn, I. Levine, X Zhu, E. Bonvin, S. Majerus, J. Boger, P. Jagam, A. B. Knox, David A. Sinclair, H. Fergani, J. K. Rowley, J. J. Simpson, H. Heron, C. K. Hargrove, A.S Hamer, J.-X Wang, Bhaskar Sur, S Noël, Minfang Yeh, V. M. Novikov, B. T. Cleveland, Darren Grant, N. A. Jelley, J. Farine, A. J. Noble, G. Doucas, A. B. McDonald, F. Dalnoki-Veress, C. Jillings, M. Shatkay, X Dai, and C. Mifflin

Subjects
Heavy water, Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Degasser, Solar neutrino, Analytical chemistry, chemistry.chemical_element, Radon, Lucas cell, 7. Clean energy, 01 natural sciences, 6. Clean water, Nuclear physics, chemistry.chemical_compound, chemistry, 0103 physical sciences, 010306 general physics, Instrumentation, Water vapor, Cold trap
Abstract

The technique used at the Sudbury Neutrino Observatory (SNO) to measure the concentration of 222 Rn in water is described. Water from the SNO detector is passed through a vacuum degasser (in the light water system) or a membrane contact degasser (in the heavy water system) where dissolved gases, including radon, are liberated. The degasser is connected to a vacuum system which collects the radon on a cold trap and removes most other gases, such as water vapor and N2. After roughly 0.5 tonnes of H2O or 6 tonnes of D2O have been sampled, the accumulated radon is transferred to a Lucas cell. The cell is mounted on a photomultiplier tube which detects the α-particles from the decay of 222 Rn and its progeny. The overall degassing and concentration efficiency is about 38% and the single-α counting efficiency is approximately 75%. The sensitivity of the radon assay system for D2O is equivalent to ∼3×10 −15 g U/g water. The radon concentration in both the H2O and D2O is sufficiently low that the rate of background events from U-chain elements is a small fraction of the interaction rate of solar neutrinos by the neutral current reaction.

Published
2004
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12. Combined analysis of all three phases of solar neutrino data from the Sudbury Neutrino Observatory

Author

M. Kos, Peter Watson, L. L. Kormos, Jocelyn Monroe, B. C. Robertson, G. T. Ewan, K. Boudjemline, M. H. Schwendener, M. Huang, E. Guillian, B. Aharmim, T. Kutter, B. G. Nickel, P. J. Doe, F. Zhang, J. R. Leslie, A. W. P. Poon, M. Bergevin, N. Gagnon, J. Law, G. D. Orebi Gann, P.-L. Drouin, Yuen-Dat Chan, K. Graham, F. A. Duncan, S. M. Oser, Hal Evans, N. McCauley, M. L. Miller, B. Beltran, G. Prior, S. D. Reitzner, S. N. Ahmed, R. D. Martin, H. Deng, Christopher C. M. Kyba, Steven Elliott, R. G. H. Robertson, R. J. Ford, C. Kraus, T. Sonley, R. Van Berg, Kai Zuber, P. Jagam, Rachel Rosten, M. Dunford, J. Wendland, S. J. M. Peeters, Olivier Simard, Keith Rielage, A. L. Hallin, A. Krüger, J. F. Wilkerson, G. Doucas, R. W. Ollerhead, A. Hime, N. West, A. J. Noble, C. B. Krauss, W. J. Heintzelman, F. Fleurot, A. E. Anthony, H. Wan Chan Tseung, M. L. Chen, S. Habib, Bei Cai, H. M. O'Keeffe, K. T. Lesko, D. L. Wark, D. Chauhan, Joseph A. Formaggio, Minfang Yeh, J. M. Wouters, Ryuta Hazama, B. T. Cleveland, S. Majerus, J. C. Loach, N. A. Jelley, H. B. Mak, J. Maneira, M. Jerkins, N. Tolich, J. J. Simpson, G. Tešić, J. Tm. Goon, A. B. McDonald, S. McGee, R. L. Hahn, S. D. Biller, R. A. Ott, P. J. Harvey, C. J. Virtue, E. D. Hallman, N. Barros, B.A. VanDevender, C. Howard, J. Farine, J. R. Wilson, J. Heise, T. Tsui, E. W. Beier, M. DiMarco, B. Jamieson, S. Seibert, R. MacLellan, N. S. Oblath, Mark Guy Boulay, R. L. Helmer, J. R. Klein, P. Skensved, X. Dai, J. A. Detwiler, R. Lange, J. A. Secrest, I. T. Lawson, L. C. Stonehill, G. A. Cox, Benjamin Monreal, E. D. Earle, K. J. Keeter, A. Wright, H. Fergani, and Alain Bellerive

Subjects
Nuclear and High Energy Physics, Particle physics, Solar neutrino, FOS: Physical sciences, Cosmic ray, 7. Clean energy, 01 natural sciences, Particle identification, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Charged current, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Sudbury Neutrino Observatory, Neutral current, 010308 nuclear & particles physics, QC0793, High Energy Physics - Phenomenology, Astrophysics - Solar and Stellar Astrophysics, Neutrino
Abstract

We report results from a combined analysis of solar neutrino data from all phases of the Sudbury Neutrino Observatory. By exploiting particle identification information obtained from the proportional counters installed during the third phase, this analysis improved background rejection in that phase of the experiment. The combined analysis resulted in a total flux of active neutrino flavors from 8B decays in the Sun of (5.25 \pm 0.16(stat.)+0.11-0.13(syst.))\times10^6 cm^{-2}s^{-1}. A two-flavor neutrino oscillation analysis yielded \Deltam^2_{21} = (5.6^{+1.9}_{-1.4})\times10^{-5} eV^2 and tan^2{\theta}_{12}= 0.427^{+0.033}_{-0.029}. A three-flavor neutrino oscillation analysis combining this result with results of all other solar neutrino experiments and the KamLAND experiment yielded \Deltam^2_{21} = (7.41^{+0.21}_{-0.19})\times10^{-5} eV^2, tan^2{\theta}_{12} = 0.446^{+0.030}_{-0.029}, and sin^2{\theta}_{13} = (2.5^{+1.8}_{-1.5})\times10^{-2}. This implied an upper bound of sin^2{\theta}_{13} < 0.053 at the 95% confidence level (C.L.).

Published
2013

13. Measurement of theνeand total8B solar neutrino fluxes with the Sudbury Neutrino Observatory phase-III data set

Author

M. DiMarco, R. J. Ford, R. W. Ollerhead, R. MacLellan, Mark Guy Boulay, P. Jagam, M. H. Schwendener, A. Krüger, B. C. Robertson, J. Tm. Goon, N. Gagnon, G. Doucas, F. Zhang, J. R. Wilson, J. B. Wilhelmy, S. Habib, R. L. Helmer, S. R. Seibert, J. Law, T. Kutter, J. Heise, N. West, P.-L. Drouin, P. Skensved, Hal Evans, F. Fleurot, G. D. Orebi Gann, J. F. Amsbaugh, Ryuta Hazama, H. Wan Chan Tseung, M. L. Miller, A. E. Anthony, J. V. Germani, E. D. Hallman, W. J. Heintzelman, H. Deng, K. M. Heeger, E. Guillian, C. Kraus, S. D. Biller, J. R. Leslie, S. Majerus, Yuen-Dat Chan, K. Boudjemline, K. Graham, M. W.E. Smith, L. L. Kormos, Alain Bellerive, Bernie G. Nickel, J. Wendland, S. M. Oser, S. R. Elliott, G. T. Ewan, Andrew Hime, Joshua R. Klein, A. W. Myers, P. J. Harvey, Juan-Manuel Anaya, J. Banar, K. T. Lesko, Monica Dunford, J. Maneira, M. A. Howe, M. Huang, Reyco Henning, P. M. Thornewell, N. Barros, T. J. Sonley, A. W. P. Poon, S. D. Reitzner, S. N. Ahmed, R. D. Martin, J. J. Simpson, Malcolm M. Fowler, Kai Zuber, T. J. Bowles, C. D. Tunnell, P. J. Doe, G. Tešić, J. A. Formaggio, M. Bergevin, C. A. Duba, N. McCauley, A. Goldschmidt, Bei Cai, Minfang Yeh, E. Rollin, R. G. H. Robertson, R. A. Ott, T.H. Burritt, D. Chauhan, R. Van Berg, H. B. Mak, C. J. Virtue, B. Jamieson, J. F. Wilkerson, T. D. Van Wechel, K. J. Keeter, A. Wright, J. C. Loach, C. Currat, N. A. Jelley, S. J. M. Peeters, T. D. Steiger, M. L. Chen, T. V. Bullard, M. Kos, A. A. Hamian, O. Simard, X. Dai, J. A. Detwiler, R. Lange, G. Prior, C. Howard, E. W. Beier, J. Farine, R. L. Hahn, M. C. Browne, A. J. Noble, L. C. Stonehill, S. McGee, J. M. Wouters, A. B. McDonald, Christopher C. M. Kyba, B. L. Wall, B. T. Cleveland, H. M. O'Keeffe, Keith Rielage, Jocelyn Monroe, B. Aharmim, B. Beltran, A. L. Hallin, C. Mifflin, N. S. Oblath, C. B. Krauss, M. R. Dragowsky, B. A. VanDevender, N. Tolich, Guthrie Miller, B. Morissette, Benjamin Monreal, E. D. Earle, G. C. Harper, F. A. Duncan, J. A. Secrest, I. T. Lawson, D. Waller, G. A. Cox, H. Fergani, and T. Tsui

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Solar energetic particles, 010308 nuclear & particles physics, Solar neutrino, Cosmic ray, 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Neutrino, 010306 general physics, Neutrino oscillation, Charged current, Lepton
Abstract

This paper details the solar neutrino analysis of the 385.17-day phase-III data set acquired by the Sudbury Neutrino Observatory (SNO). An array of He-3 proportional counters was installed in the heavy-water target to measure precisely the rate of neutrino-deuteron neutral-current interactions. This technique to determine the total active B-8 solar neutrino flux was largely independent of the methods employed in previous phases. The total flux of active neutrinos was measured to be 5.54(-0.31)(+0.33)(stat.)(-0.34)(+0.36)(syst.) x 10(6) cm(-2) s(-1), consistent with previous measurements and standard solar models. A global analysis of solar and reactor neutrino mixing parameters yielded the best-fit values of Delta m(2) = 7.59(-0.21)(+0.19) x 10(-5) eV(2) and theta = 34.4(-1.2)(+1.3) degrees. DOI: 10.1103/PhysRevC.87.015502

Published
2013
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14. A Search for Astrophysical Burst Signals at the Sudbury Neutrino Observatory

Author

P. Skensved, Monica Dunford, J. Maneira, S. J. M. Peeters, A. W. P. Poon, J. Tm. Goon, Jocelyn Monroe, J. A. Secrest, I. T. Lawson, S. Habib, J. Wendland, C. J. Virtue, G. Prior, N. Barros, D. Waller, Yuen-Dat Chan, K. Graham, David A. Sinclair, T. Tsui, G. A. Cox, Kai Zuber, Joseph A. Formaggio, J. Heise, Christopher C. M. Kyba, A. Wright, X. Dai, Minfang Yeh, E. D. Hallman, K. Boudjemline, M. DiMarco, F. Fleurot, J. A. Detwiler, R. Lange, S. M. Oser, Benjamin Monreal, B. Aharmim, E. D. Earle, J. C. Loach, N. A. Jelley, O. Simard, I. Levine, D. Chauhan, C. Kraus, A. E. Anthony, B. Beltran, M. L. Miller, K. J. Keeter, B. C. Robertson, S. D. Reitzner, S. N. Ahmed, S. Majerus, J. F. Wilkerson, N. West, G. Doucas, M. Bergevin, C. B. Krauss, N. S. Oblath, A. Krueger, W. J. Heintzelman, T. Kutter, J. J. Simpson, R. A. Ott, M. H. Schwendener, N. McCauley, T. J. Sonley, P. J. Doe, H. Fergani, P. Jagam, F. Zhang, A. L. Hallin, R. L. Hahn, Keith Rielage, K. T. Lesko, Peter Watson, Alain Bellerive, R. Van Berg, R. J. Ford, Bei Cai, J. Law, N. Tolich, J. R. Wilson, M. Kos, B. T. Cleveland, P.-L. Drouin, R. MacLellan, S. R. Seibert, E. W. Beier, Mark Guy Boulay, Min Chen, H. Wan Chan Tseung, Steven Elliott, L. C. Stonehill, D. L. Wark, Hal Evans, J. M. Wouters, Joshua R. Klein, J. R. Leslie, E. Guillian, A. B. McDonald, B.A. VanDevender, Andrew Hime, C. Howard, J. Farine, A. J. Noble, M. Jerkins, F. A. Duncan, M. Huang, Miriam Diamond, G. Tešić, R. D. Martin, R. G. H. Robertson, H. B. Mak, L. L. Kormos, S. McGee, G. T. Ewan, B. L. Wall, N. Gagnon, R. Hazama, G. D. Orebi Gann, H. Deng, H. M. O'Keeffe, S. D. Biller, R. L. Helmer, Bernie G. Nickel, P. J. Harvey, R.W. Ollerhead, B. Jamieson, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Formaggio, Joseph A., Miller, Michael L., Monreal, Benjamin, Monroe, Jocelyn, Solomon-Oblath, Noah, Ott, Richard A., and Sonley, Thomas J.

Subjects
Physics, Sudbury Neutrino Observatory, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Astronomy, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Solar neutrino problem, Neutrino detector, Astrophysics - Solar and Stellar Astrophysics, Measurements of neutrino speed, Astrophysics::Solar and Stellar Astrophysics, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Nuclear Experiment (nucl-ex), Neutrino oscillation, Nuclear Experiment, QC, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

The Sudbury Neutrino Observatory (SNO) has confirmed the standard solar model and neutrino oscillations through the observation of neutrinos from the solar core. In this paper we present a search for neutrinos associated with sources other than the solar core, such as gamma-ray bursts and solar flares. We present a new method for looking for temporal coincidences between neutrino events and astrophysical bursts of widely varying intensity. No correlations were found between neutrinos detected in SNO and such astrophysical sources., United States. Dept. of Energy, National Energy Research Scientific Computing Center (U.S.), Alfred P. Sloan Foundation

Published
2013
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15. Light concentrators for the Sudbury Neutrino Observatory

Author

Chris Waltham, Salvador Gil, N. A. Jelley, N.W. Tanner, M. Moorhead, L. McGarry, and G. Doucas

Subjects
Heavy water, Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Photomultiplier, Physics::Instrumentation and Detectors, business.industry, Cherenkov detector, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Elementary particle, law.invention, chemistry.chemical_compound, Optics, chemistry, Neutrino detector, law, business, Instrumentation, Cherenkov radiation
Abstract

There is an important and growing class of elementary particle detectors which are characterized by a large sensitive volume (thousands of tonnes), very low radioactive backgrounds, and rely on the emission of light for particle detection. Water Cherenkov detectors come into this category; they have a large mass of water as the sensitive medium. Particles are detected when they interact with the water and produce Cherenkov light, so detection efficiency relies on having a huge light sensitive area at the periphery of the detector. The most cost-effective way of achieving this is by placing light concentrators on large photomultiplier tubes (PMTs). This paper describes the work carried out on light concentrators for the PMTs in the Sudbury Neutrino Observatory, a 1000 tonne heavy water Cherenkov detector. We discuss the advantages of using light concentrators, summarize the optical theory of non-imaging light concentration, and describe in detail the development and manufacture of the concentrators themselves.

Published
1996
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16. Investigations into the origin of the spurious 17 keV neutrino signal observed in35S beta decay

Author

M. G. Bowler and N. A. Jelley

Subjects
Physics, Range (particle radiation), Microprobe, Physics and Astronomy (miscellaneous), Proton, Astrophysics::High Energy Astrophysical Phenomena, Electron, Beta decay, Spectral line, Nuclear physics, Distortion, Atomic physics, Neutrino, Engineering (miscellaneous), Nuclear Physics
Abstract

An exhaustive study has been made of the β spectrum of35S, recorded with a Si(Li) detector. The object was to identify the origin of a distortion in the35S β spectrum some 17 keV below the end point, reported over three years ago and interpreted then as evidence for a 17 keV neutrino. Measurements with different source-detector spacings and with varied collimation have shown that there is a long range curvature in the Kurie plot which is a sensitive function of configuration, but the principal origin of the distortion is energy loss in the35S sources. The35S sources, prepared by chemical adsorption of Ba35SO4 on a gold substrate, are clumped and locally thick. Electrons near the end point lose ∼0.3 keV in the source material and if this is taken into account the spectra are well fitted without any admixture of 17 keV neutrino. The source thickness has been investigated with a proton microprobe and determined from both source tilting and the yield of barium K X-rays; these studies are discussed in detail. The uncertainties in and justification for the form of the electron response function employed are also thoroughly discussed. If there is no systematic error common to the majority of 14 independent sets of35S data, the admixture of 17 keV neutrino is

Published
1995
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17. Four methods for determining the composition of trace radioactive surface contamination of low-radioactivity metal

Author

C. Kraus, T. D. Van Wechel, N. Gagnon, B.A. VanDevender, Keith Rielage, L. C. Stonehill, T.H. Burritt, S. Majerus, A. W. Myers, R. G. H. Robertson, H. M. O'Keeffe, I. T. Lawson, R.C. Rosten, N. A. Jelley, B. T. Cleveland, S. McGee, G. Doucas, and Alan Poon

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Radiochemistry, Proportional counter, Thorium, chemistry.chemical_element, FOS: Physical sciences, Alpha particle, Uranium, Scintillator, 01 natural sciences, Particle detector, Nuclear physics, chemistry, 0103 physical sciences, Decay chain, Nuclear Experiment (nucl-ex), 010306 general physics, Instrumentation, Nuclear Experiment, Cherenkov radiation
Abstract

Four methods for determining the composition of low-level uranium- and thorium-chain surface contamination are presented. One method is the observation of Cherenkov light production in water. In two additional methods a position-sensitive proportional counter surrounding the surface is used to make both a measurement of the energy spectrum of alpha particle emissions and also coincidence measurements to derive the thorium-chain content based on the presence of short-lived isotopes in that decay chain. The fourth method is a radiochemical technique in which the surface is eluted with a weak acid, the eluate is concentrated, added to liquid scintillator and assayed by recording beta-alpha coincidences. These methods were used to characterize two `hotspots' on the outer surface of one of the He-3 proportional counters in the Neutral Current Detection array of the Sudbury Neutrino Observatory experiment. The methods have similar sensitivities, of order tens of ng, to both thorium- and uranium-chain contamination., 22 pages, 19 figures

Published
2011

18. LOW-MULTIPLICITY BURST SEARCH AT THE SUDBURY NEUTRINO OBSERVATORY

Author

J. A. Secrest, G. T. Ewan, E. Guillian, B. C. Robertson, G. Doucas, T. Kutter, S. D. Biller, J. J. Simpson, Bernie G. Nickel, F. Fleurot, A. E. Anthony, P. J. Harvey, N. West, C. J. Virtue, T. Tsui, W. J. Heintzelman, R. A. Ott, Benjamin Monreal, E. D. Earle, M. Huang, K. T. Lesko, K. Boudjemline, Monica Dunford, N. Barros, Hal Evans, E. D. Hallman, M. L. Miller, J. Maneira, S. R. Seibert, Christopher C. M. Kyba, B. Beltran, A. W. P. Poon, T. J. Sonley, Keith Rielage, M. Kos, S. D. Reitzner, S. N. Ahmed, Joseph A. Formaggio, R. D. Martin, Minfang Yeh, J. R. Wilson, G. Prior, R. G. H. Robertson, Joshua R. Klein, J. R. Leslie, J. Heise, J. C. Loach, N. A. Jelley, N. Gagnon, G. Tešić, H. M. O'Keeffe, R. J. Ford, H. Fergani, A. Wright, R. Hazama, G. D. Orebi Gann, Bei Cai, E. W. Beier, S. Habib, A. L. Hallin, Steven Elliott, R. MacLellan, R. L. Helmer, H. Deng, Jocelyn Monroe, H. B. Mak, B.A. VanDevender, Mark Guy Boulay, O. Simard, C. Howard, J. Farine, B. Aharmim, M. Jerkins, A. J. Noble, C. B. Krauss, N. S. Oblath, J. F. Wilkerson, David A. Sinclair, S. J. M. Peeters, C. Kraus, Peter Watson, J. T.M. Goon, Yuen-Dat Chan, F. A. Duncan, K. Graham, D. Chauhan, S. M. Oser, N. Tolich, P. Skensved, A. B. McDonald, L. C. Stonehill, and K. Zuber, R. L. Hahn, H. Wan Chan Tseung, B. T. Cleveland, M. Bergevin, Alain Bellerive, X. Dai, J. A. Detwiler, N. McCauley, R. Van Berg, B. Jamieson, M. L. Chen, S. Majerus, Andrew Hime, M. H. Schwendener, F. Zhang, J. Law, and P.-L. Drouin

Subjects
Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, FOS: Physical sciences, Astronomy, Astronomy and Astrophysics, Elementary particle, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, Massless particle, High Energy Physics - Experiment (hep-ex), Supernova, Space and Planetary Science, 0103 physical sciences, Neutrino, Multiplicity (chemistry), 010306 general physics
Abstract

Results are reported from a search for low-multiplicity neutrino bursts in the Sudbury Neutrino Observatory (SNO). Such bursts could indicate detection of a nearby core-collapse supernova explosion. The data were taken from Phase I (November 1999 - May 2001), when the detector was filled with heavy water, and Phase II (July 2001 - August 2003), when NaCl was added to the target. The search was a blind analysis in which the potential backgrounds were estimated and analysis cuts were developed to eliminate such backgrounds with 90% confidence before the data were examined. The search maintained a greater than 50% detection probability for standard supernovae occurring at a distance of up to 60 kpc for Phase I and up to 70 kpc for Phase II. No low-multiplicity bursts were observed during the data-taking period., 11 pages, 4 figures, submitted to ApJ

Published
2011

19. Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory

Author

Monica Dunford, J. Maneira, A. W. P. Poon, Christopher C. M. Kyba, J. R. Leslie, J. Tm. Goon, J. F. Wilkerson, Joseph A. Formaggio, M. Kos, Minfang Yeh, C. J. Virtue, C. B. Krauss, N. S. Oblath, M. L. Miller, E. W. Beier, J. C. Loach, B. Beltran, R. A. Ott, R. D. Martin, H. B. Mak, N. A. Jelley, Jocelyn Monroe, N. Gagnon, Andrew Hime, I. Levine, R. G. H. Robertson, E. D. Hallman, M. Huang, G. Tešić, F. A. Duncan, Howe, F. Fleurot, R. Hazama, Yuen-Dat Chan, K. Graham, A. L. Hallin, J. R. Wilson, Kai Zuber, C. D. Tunnell, S. McGee, B. C. Robertson, A. E. Anthony, S. M. Oser, G. D. Orebi Gann, S. D. Biller, N. Barros, Bernie G. Nickel, B. Aharmim, G. Doucas, A. B. McDonald, C. Kraus, S. J. M. Peeters, P. J. Harvey, J.M. Wouters, R. L. Hahn, H. Deng, T. Tsui, S. Habib, N. Tolich, T. Kutter, P. Skensved, M. DiMarco, Steven Elliott, B.A. VanDevender, P. J. Doe, R. J. Ford, M. H. Schwendener, F. Zhang, J. Law, B. L. Wall, Hal Evans, David A. Sinclair, H. M. O'Keeffe, K. Boudjemline, N. West, W. J. Heintzelman, K. T. Lesko, C. Howard, J. Farine, A. J. Noble, B. Morissette, Keith Rielage, K. J. Keeter, T. J. Sonley, Bei Cai, E. Guillian, R. MacLellan, D. Chauhan, Mark Guy Boulay, L. L. Kormos, P.-L. Drouin, B. Jamieson, R. L. Helmer, G. T. Ewan, S. D. Reitzner, S. N. Ahmed, S. R. Seibert, J. Heise, X. Dai, J. A. Detwiler, C. A. Duba, H. Fergani, J. A. Secrest, I. T. Lawson, D. Waller, G. A. Cox, Benjamin Monreal, E. D. Earle, H. Wan Chan Tseung, D. L. Wark, G. Prior, T.H. Burritt, B. T. Cleveland, A. Wright, O. Simard, Alain Bellerive, L. C. Stonehill, M. Bergevin, N. McCauley, R. Van Berg, M. L. Chen, S. Majerus, and Joshua R. Klein

Subjects
Nuclear and High Energy Physics, Particle physics, Solar neutrino, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Charged current, Physics, Research Groups and Centres\Physics\Low Temperature Physics, Sudbury Neutrino Observatory, Faculty of Science\Physics, 010308 nuclear & particles physics, Solar neutrino problem, High Energy Physics - Phenomenology, 13. Climate action, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

Results are reported from a joint analysis of Phase I and Phase II data from the Sudbury Neutrino Observatory. The effective electron kinetic energy threshold used is T_eff=3.5 MeV, the lowest analysis threshold yet achieved with water Cherenkov detector data. In units of 10^6 cm^{-2} s^{-1}, the total flux of active-flavor neutrinos from 8B decay in the Sun measured using the neutral current (NC) reaction of neutrinos on deuterons, with no constraint on the 8B neutrino energy spectrum, is found to be Phi_NC = 5.140 ^{+0.160}_{-0.158} (stat) ^{+0.132}_{-0.117} (syst). These uncertainties are more than a factor of two smaller than previously published results. Also presented are the spectra of recoil electrons from the charged current reaction of neutrinos on deuterons and the elastic scattering of electrons. A fit to the SNO data in which the free parameters directly describe the total 8B neutrino flux and the energy-dependent nu_e survival probability provides a measure of the total 8B neutrino flux Phi_8B = 5.046 ^{+0.159}_{-0.152} (stat) ^{+0.107}_{-0.123} (syst). Combining these new results with results of all other solar experiments and the KamLAND reactor experiment yields best-fit values of the mixing parameters of theta_{12}=34.06 ^{+1.16}_{-0.84} degrees and Delta m^2_{21}=7.59 ^{+0.20}_{-0.21} x 10^{-5} eV^2. The global value of Phi_8B is extracted to a precision of ^{+2.38}_{-2.95} %. In a three-flavor analysis the best fit value of sin^2\theta_{13} is 2.00 ^{+2.09}_{-1.63} x 10^{-2}. Interpreting this as a limit implies an upper bound of sin^2\theta_{13} < 0.057 (95% C. L.)., Comment: 53 pages, 40 figures, submitted to Phys. Rev. C

Published
2010
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20. Measurement of the cosmic ray and neutrino-induced muon flux at the Sudbury neutrino observatory

Author

I. Levine, H. M. O'Keeffe, M. L. Miller, R. D. Martin, R. G. H. Robertson, X. Dai, J. A. Detwiler, Keith Rielage, T.H. Burritt, J. R. Leslie, T. J. Sonley, R. Lange, Christopher C. M. Kyba, S. N. Ahmed, Bei Cai, Yuen-Dat Chan, K. Graham, S. M. Oser, Jocelyn Monroe, N. Barros, S. R. Seibert, Reyco Henning, M.G. Boulay, C. A. Currat, N. Gagnon, G. T. Ewan, R. Hazama, M. A. Howe, M. Huang, G. D. Orebi Gann, B. Aharmim, M. W.E. Smith, H. Deng, P. Skensved, C. K. Hargrove, T. Tsui, H. B. Mak, M. Bergevin, H. Wan Chan Tseung, K. Boudjemline, J. R. Wilson, C. E. Okada, J. J. Simpson, Chris Waltham, S. Habib, D. L. Wark, G. Tešić, C. Kraus, A. Wright, David A. Sinclair, O. Simard, J. Wendland, Steven Elliott, A. D. Marino, N. McCauley, S. McGee, G. Prior, S. D. Biller, Y. Opachich, P. J. Harvey, J. M. Wouters, C. B. Krauss, N. S. Oblath, Alain Bellerive, J. F. Wilkerson, S. J. M. Peeters, J. T.M. Goon, Darren Grant, B. Jamieson, Hal Evans, L. C. Stonehill, B. T. Cleveland, R. L. Helmer, A. B. McDonald, E. Guillian, C. J. Virtue, E. D. Hallman, T. C. Andersen, Monica Dunford, J. Maneira, R. L. Hahn, A. W. P. Poon, B. C. Robertson, G. Doucas, P. J. Doe, R. A. Ott, K. M. Heeger, T. D. Steiger, T. Kutter, M. L. Chen, R. J. Ford, B.A. VanDevender, R. MacLellan, Joseph A. Formaggio, C. Howard, J. Farine, Minfang Yeh, A. J. Noble, J. C. Loach, N. A. Jelley, S. Majerus, Joshua R. Klein, R. S. Dosanjh, Andrew Hime, E. Rollin, M. C. Chon, J. A. Secrest, I. T. Lawson, R. J. Hemingway, M. Kos, B. Beltran, E. W. Beier, D. Waller, A. L. Hallin, C. Mifflin, Kai Zuber, N. West, W. J. Heintzelman, H. Fergani, K. T. Lesko, Benjamin Monreal, N. Tagg, M. H. Schwendener, F. A. Duncan, F. Zhang, J. Law, P.-L. Drouin, Peter Watson, N. Tolich, G.A. Cox-Mobrand, F. Dalnoki-Veress, A. Krüger, R. G. Van de Water, J. Heise, F. Fleurot, A. E. Anthony, and S. Luoma

Subjects
Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Cosmic ray, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Neutrino oscillation, Zenith, Physics, Sudbury Neutrino Observatory, Research Groups and Centres\Physics\Low Temperature Physics, Muon, 010308 nuclear & particles physics, Faculty of Science\Physics, High Energy Physics::Phenomenology, Astrophysics::Instrumentation and Methods for Astrophysics, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

Results are reported on the measurement of the atmospheric neutrino-induced muon flux at a depth of 2 kilometers below the Earth's surface from 1229 days of operation of the Sudbury Neutrino Observatory (SNO). By measuring the flux of through-going muons as a function of zenith angle, the SNO experiment can distinguish between the oscillated and un-oscillated portion of the neutrino flux. A total of 514 muon-like events are measured between $-1 \le \cos{\theta}_{\rm zenith} \le 0.4$ in a total exposure of 2.30\times 10^{14}$ cm$^{2}$ s. The measured flux normalization is $1.22 \pm 0.09$ times the Bartol three-dimensional flux prediction. This is the first measurement of the neutrino-induced flux where neutrino oscillations are minimized. The zenith distribution is consistent with previously measured atmospheric neutrino oscillation parameters. The cosmic ray muon flux at SNO with zenith angle $\cos{\theta}_{\rm zenith} > 0.4$ is measured to be $(3.31 \pm 0.01 {\rm (stat.)} \pm 0.09 {\rm (sys.)}) \times 10^{-10}~\mu$/s/cm$^{2}$., Comment: 17 pages, 11 figures

Published
2009

21. High sensitivity measurement of 224Ra and 226Ra in water with an improved hydrous titanium oxide technique at the Sudbury Neutrino Observatory

Author

H. Fergani, X. Dai, R. J. Ford, R. Lange, J. Farine, A. J. Noble, G. Doucas, S. Majerus, E. D. Hallman, C. Mifflin, David A. Sinclair, H. M. O'Keeffe, Minfang Yeh, N. A. Jelley, B. Aharmim, R. L. Hahn, R. Rodriguez-jimenez, and B. T. Cleveland

Subjects
Heavy water, Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Alkaline earth metal, 010308 nuclear & particles physics, Liquid scintillation counting, Analytical chemistry, FOS: Physical sciences, Thorium, chemistry.chemical_element, Uranium, 01 natural sciences, 7. Clean energy, Titanium oxide, Nuclear physics, chemistry.chemical_compound, chemistry, 13. Climate action, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Instrumentation, Nuclear Experiment, Isotopes of thorium
Abstract

The existing hydrous titanium oxide (HTiO) technique for the measurement of 224Ra and 226Ra in the water at the Sudbury Neutrino Observatory (SNO) has been changed to make it faster and less sensitive to trace impurities in the HTiO eluate. Using HTiO-loaded filters followed by cation exchange adsorption and HTiO co-precipitation, Ra isotopes from 200-450 tonnes of heavy water can be extracted and concentrated into a single sample of a few millilitres with a total chemical efficiency of 50%. Combined with beta-alpha coincidence counting, this method is capable of measuring 2.0x10^3 uBq/kg of 224Ra and 3.7x10^3 uBq/kg of 226Ra from the 232Th and 238U decay chains, respectively, for a 275 tonne D2O assay, which are equivalent to 5x10^16 g Th/g and 3x10^16 g U/g in heavy water., 8 Pages, 2 figures and 2 tables

Published
2008

22. Determination of theνeand totalB8solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

Author

M. Huang, R. U. Haq, C. B. Krauss, N. S. Oblath, Malcolm M. Fowler, J. Wendland, F. A. Duncan, J. A. Dunmore, H. Fergani, N.W. Tanner, K. Kazkaz, W. B. Handler, R. J. Ford, G. Jonkmans, A. P. Ferraris, J. X. Wang, S. J. M. Peeters, B. Aharmim, M. W.E. Smith, A. S. Hamer, Y. I. Tserkovnyak, J. F. Wilkerson, K. McFarlane, T. J. Walker, R. MacLellan, G. McGregor, G. Prior, M. Bercovitch, J. A. Formaggio, Reda Tafirout, Darren Grant, Benjamin Monreal, C. Jillings, C. A. Duba, B. Jamieson, N. West, Q. R. Ahmad, N. Tagg, E. D. Earle, B. L. Wall, F. Dalnoki-Veress, V. L. Rusu, G. Milton, W. F. Davidson, W. J. Heintzelman, J. Boger, H. W. Lee, P. T. Trent, R. G. Stokstad, C. J. Virtue, R. L. Hahn, H. Mes, Salvador Gil, J. A. Secrest, J. C. Barton, I. T. Lawson, H. S. Ng, T. Tsui, R. J. Boardman, L. C. Stonehill, P. Jagam, J. G. Hykaway, G. A. Cox, J. D. Anglin, Minfang Yeh, K. T. Lesko, M. C.P. Isaac, M. DiMarco, L. L. Kormos, Steven Elliott, F. M. Newcomer, S. D. Reitzner, S. N. Ahmed, Keith Rielage, T. J. Bowles, Monica Dunford, J. Maneira, A. Krüger, R. G. Van de Water, Peter Wittich, J. T.M. Goon, A. W. P. Poon, T. V. Bullard, B. C. Robertson, M. Moorhead, J. Cameron, J. C. Loach, N. A. Jelley, M. Thorman, H. M. O'Keeffe, G. Doucas, Yuen-Dat Chan, R. W. Ollerhead, M. Kos, X. Chen, J. Lyon, J. B. Wilhelmy, K. Graham, S. M. Oser, E. D. Hallman, T. Kutter, R. Meijer Drees, A. Schülke, A. L. Hallin, C. Mifflin, H. Wan Chan Tseung, G. T. Ewan, J. H.M. Cowan, R. K. Taplin, E. W. Beier, John L. Orrell, R. S. Storey, S. D. Biller, H. Labranche, Bernie G. Nickel, M.G. Boulay, D. L. Wark, J. Bigu, B. Morrissette, S. J. Brice, C. Kraus, I. Levine, A. Goldschmidt, P. J. Harvey, N. Tolich, S. S.E. Rosendahl, J. R. Leslie, B. A. Moffat, P. M. Thornewell, A. D. Marino, J. M. Wouters, Hal Evans, M. Lay, Reyco Henning, Y. Takeuchi, C. K. Hargrove, K. K.S. Miknaitis, M. R. Dragowsky, E. Guillian, T. C. Andersen, P. T. Keener, H. B. Mak, A. B. McDonald, H. Seifert, Christopher C. M. Kyba, N. Gagnon, J. J. Simpson, Klaus Kirch, E. Saettler, C. E. Okada, J. D. Hepburn, E. D. Frank, Herbert H. Chen, N. Starinsky, P. J. Doe, M. H. Schwendener, E. Bonvin, David A. Sinclair, S. McGee, J. Heise, F. Fleurot, S. Luoma, R. J. Komar, R. C. Allen, H. Heron, A. Roberge, P. Skensved, H. Deng, D. S. McDonald, D. F. Cowen, J. Law, V. M. Novikov, C. J. Sims, J. V. Germani, I. Blevis, M. Omori, J. Hewett, Andrew Hime, Kai Zuber, C. D. Tunnell, X. Dai, R. Lange, Mark Neubauer, M. G. Bowler, M. C. Browne, R. L. Helmer, M. Shatkay, C. Howard, C. W. Nally, J. Farine, Alan R. Smith, A. J. Noble, T.H. Burritt, G. Bühler, R. A. Black, J. K. Rowley, Joshua R. Klein, R. A. Ott, W. Locke, B. T. Cleveland, W. Frati, J. R. Wilson, A. B. Knox, Bhaskar Sur, Richard T. Kouzes, M. Bergevin, N. McCauley, C. A. Currat, R. Van Berg, K. Frame, E. B. Norman, K. M. Heeger, A. Wright, R. D. Martin, R. G. H. Robertson, T. D. Steiger, Chris Waltham, M. L. Chen, A. A. Hamian, Ryuta Hazama, M. L. Miller, S. Majerus, and M. A. Howe

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Particle physics, Neutral current, 010308 nuclear & particles physics, Solar neutrino, media_common.quotation_subject, Cosmic ray, 01 natural sciences, 7. Clean energy, Asymmetry, Nuclear physics, 13. Climate action, 0103 physical sciences, Neutrino, 010306 general physics, Charged current, media_common
Abstract

This article provides the complete description of resultsfrom the Phase I data set of the Sudbury Neutrino Observatory (SNO). ThePhase I data set is based on a 0.65 kt-year exposure of heavy water tothe solar 8B neutrino flux. Included here are details of the SNO physicsand detector model, evaluations of systematic uncertainties, andestimates of backgrounds. Also discussed are SNO's approach tostatistical extraction of the signals from the three neutrino reactions(charged current, neutral current, and elastic scattering) and theresults of a search for a day-night asymmetry in the ?e flux. Under theassumption that the 8B spectrum is undistorted, the measurements fromthis phase yield a solar ?e flux of ?(?e) =1.76+0.05?0.05(stat.)+0.09?0.09 (syst.) x 106 cm?2 s?1, and a non-?ecomponent ?(? mu) = 3.41+0.45?0.45(stat.)+0.48?0.45 (syst.) x 106 cm?2s?1. The sum of these components provides a total flux in excellentagreement with the predictions of Standard Solar Models. The day-nightasymmetry in the ?e flux is found to be Ae = 7.0 +- 4.9 (stat.)+1.3?1.2percent (sys.), when the asymmetry in the total flux is constrained to bezero.

Published
2007
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23. A search for neutrinos from the solar hep reaction and the diffuse supernova neutrino background with the Sudbury Neutrino Observatory

Author

S. N. Ahmed, Hal Evans, J. Wendland, A. L. Hallin, C. Mifflin, J. M. Wouters, F. Fleurot, L. L. Kormos, H. Wan Chan Tseung, A. E. Anthony, S. Luoma, H. Labranche, D. L. Wark, G. T. Ewan, R. G. Stokstad, Benjamin Monreal, E. D. Earle, Alain Bellerive, T. Tsui, A. D. Marino, Keith Rielage, F. Dalnoki-Veress, M. DiMarco, P. Jagam, B. C. Robertson, A. Krüger, R. G. Van de Water, G. Doucas, Yuen-Dat Chan, K. Graham, N. Gagnon, J. A. Secrest, I. T. Lawson, S. M. Oser, Joseph A. Formaggio, X. Chen, D. Waller, G. A. Cox, B. L. Wall, R. Hazama, A. Wright, Minfang Yeh, T. Kutter, R. A. Ott, R. J. Ford, P. Skensved, O. Simard, G. D. Orebi Gann, J. C. Loach, N. A. Jelley, B. Aharmim, H. Fergani, R. MacLellan, G. Prior, L. C. Stonehill, H. M. O'Keeffe, H. Deng, C. B. Krauss, N. S. Oblath, S. D. Biller, Bernie G. Nickel, J. R. Wilson, Reyco Henning, R. D. Martin, E. B. Norman, X. Dai, T. J. Walker, M.G. Boulay, R. G. H. Robertson, C. J. Virtue, J. A. Detwiler, M. A. Howe, P. J. Harvey, R. Lange, M. Huang, K. M. Heeger, J. Tm. Goon, N. Tolich, F. A. Duncan, G. Tešić, C. Kraus, J. R. Leslie, B. T. Cleveland, B.A. VanDevender, E. D. Hallman, J. F. Wilkerson, C. Howard, J. Farine, P. J. Doe, A. J. Noble, Joshua R. Klein, J. Heise, J. A. Dunmore, K.K.S. Miknaitis, S. McGee, H. B. Mak, M. Bergevin, N. McCauley, C. A. Currat, R. Van Berg, C. E. Okada, David A. Sinclair, M. L. Chen, S. R. Seibert, S. Majerus, R. L. Helmer, Monica Dunford, J. Maneira, A. W. P. Poon, S. J. M. Peeters, Andrew Hime, M. L. Miller, M. H. Schwendener, F. Zhang, J. Law, P.-L. Drouin, C. J. Sims, Kai Zuber, R. L. Hahn, Christopher C. M. Kyba, E. Rollin, R. J. Hemingway, M. Kos, A. B. McDonald, E. W. Beier, N. West, W. J. Heintzelman, K. T. Lesko, and E. Guillian

Subjects
Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Astrophysics (astro-ph), Astronomy and Astrophysics, Solar neutrino problem, Neutrino detector, 13. Climate action, Space and Planetary Science, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

A search has been made for neutrinos from the hep reaction in the Sun and from the diffuse supernova neutrino background (DSNB) using data collected during the first operational phase of the Sudbury Neutrino Observatory, with an exposure of 0.65 kilotonne-years. For the hep neutrino search, two events are observed in the effective electron energy range of 14.3 MeV, Comment: 12 pages, 5 figures, accepted for publication by ApJ. Minor updates to address referees comments

Published
2006
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24. Electron energy spectra, fluxes, and day-night asymmetries of8B solar neutrinos from measurements with NaCl dissolved in the heavy-water detector at the Sudbury Neutrino Observatory

Author

B. Aharmim, S. N. Ahmed, A. E. Anthony, E. W. Beier, A. Bellerive, M. Bergevin, S. D. Biller, J. Boger, M. G. Boulay, M. G. Bowler, T. V. Bullard, Y. D. Chan, M. Chen, X. Chen, B. T. Cleveland, G. A. Cox, C. A. Currat, X. Dai, F. Dalnoki-Veress, H. Deng, P. J. Doe, R. S. Dosanjh, G. Doucas, C. A. Duba, F. A. Duncan, M. Dunford, J. A. Dunmore, E. D. Earle, S. R. Elliott, H. C. Evans, G. T. Ewan, J. Farine, H. Fergani, F. Fleurot, J. A. Formaggio, K. Frame, W. Frati, B. G. Fulsom, N. Gagnon, K. Graham, D. R. Grant, R. L. Hahn, J. C. Hall, A. L. Hallin, E. D. Hallman, W. B. Handler, C. K. Hargrove, P. J. Harvey, R. Hazama, K. M. Heeger, L. Heelan, W. J. Heintzelman, J. Heise, R. L. Helmer, R. J. Hemingway, A. Hime, C. Howard, M. A. Howe, M. Huang, P. Jagam, N. A. Jelley, J. R. Klein, L. L. Kormos, M. S. Kos, A. Krüger, C. Kraus, C. B. Krauss, A. V. Krumins, T. Kutter, C. C. M. Kyba, H. Labranche, R. Lange, J. Law, I. T. Lawson, K. T. Lesko, J. R. Leslie, I. Levine, J. C. Loach, S. Luoma, R. MacLellan, S. Majerus, H. B. Mak, J. Maneira, A. D. Marino, N. McCauley, A. B. McDonald, S. McGee, G. McGregor, C. Mifflin, K. K. S. Miknaitis, B. A. Moffat, C. W. Nally, M. S. Neubauer, B. G. Nickel, A. J. Noble, E. B. Norman, N. S. Oblath, C. E. Okada, R. W. Ollerhead, J. L. Orrell, S. M. Oser, C. Ouellet, S. J. M. Peeters, A. W. P. Poon, K. Rielage, B. C. Robertson, R. G. H. Robertson, E. Rollin, S. S. E. Rosendahl, V. L. Rusu, M. H. Schwendener, S. R. Seibert, O. Simard, J. J. Simpson, C. J. Sims, D. Sinclair, P. Skensved, M. W. E. Smith, N. Starinsky, R. G. Stokstad, L. C. Stonehill, R. Tafirout, Y. Takeuchi, G. Tešić, M. Thomson, M. Thorman, T. Tsui, R. Van Berg, R. G. Van de Water, C. J. Virtue, B. L. Wall, D. Waller, C. E. Waltham, H. Wan Chan Tseung, D. L. Wark, J. Wendland, N. West, J. F. Wilkerson, J. R. Wilson, P. Wittich, J. M. Wouters, A. Wright, M. Yeh, and K. Zuber

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Solar neutrino, Isotopes of boron, 01 natural sciences, 7. Clean energy, Spectral line, Nuclear physics, 13. Climate action, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Neutrino, 010306 general physics, Neutrino oscillation, Lepton
Abstract

Results are reported from the complete salt phase of the Sudbury Neutrino Observatory experiment in which NaCl was dissolved in the {sup 2}H{sub 2}O (''D{sub 2}O'') target. The addition of salt enhanced the signal from neutron capture as compared to the pure D{sub 2}O detector. By making a statistical separation of charged-current events from other types based on event-isotropy criteria, the effective electron recoil energy spectrum has been extracted. In units of 10{sup 6}cm{sup -2}s{sup -1}, the total flux of active-flavor neutrinos from {sup 8}B decay in the Sun is found to be 4.94{sub -0.21}{sup +0.21}(stat){sub -0.34}{sup +0.38}(syst) and the integral flux of electron neutrinos for an undistorted {sup 8}B spectrum is 1.68{sub -0.06}{sup +0.06}(stat){sub -0.09}{sup +0.08}(syst); the signal from ({nu}{sub x},e) elastic scattering is equivalent to an electron-neutrino flux of 2.35{sub -0.22}{sup +0.22}(stat){sub -0.15}{sup +0.15}(syst). These results are consistent with those expected for neutrino oscillations with the so-called large mixing angle parameters and also with an undistorted spectrum. A search for matter-enhancement effects in the Earth through a possible day-night asymmetry in the charged-current integral rate is consistent with no asymmetry. Including results from other experiments, the best-fit values for two-neutrino mixing parameters are {delta}m{sup 2}=(8.0{sub -0.4}{sup +0.6})x10{sup -5}more » eV{sup 2} and {theta}=33.9{sub -2.2}{sup +2.4} degrees.« less

Published
2005
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25. Search for periodicities in theB8solar neutrino flux measured by the Sudbury Neutrino Observatory

Author

B. Aharmim, S. N. Ahmed, A. E. Anthony, E. W. Beier, A. Bellerive, M. Bergevin, S. D. Biller, M. G. Boulay, M. G. Bowler, Y. D. Chan, M. Chen, X. Chen, B. T. Cleveland, T. Costin, G. A. Cox, C. A. Currat, X. Dai, H. Deng, J. Detwiler, P. J. Doe, R. S. Dosanjh, G. Doucas, C. A. Duba, F. A. Duncan, M. Dunford, J. A. Dunmore, E. D. Earle, S. R. Elliott, H. C. Evans, G. T. Ewan, J. Farine, H. Fergani, F. Fleurot, J. A. Formaggio, W. Frati, B. G. Fulsom, N. Gagnon, J. TM. Goon, K. Graham, R. L. Hahn, A. L. Hallin, E. D. Hallman, W. B. Handler, C. K. Hargrove, P. J. Harvey, R. Hazama, K. M. Heeger, L. Heelan, W. J. Heintzelman, J. Heise, R. L. Helmer, R. J. Hemingway, A. Hime, M. A. Howe, M. Huang, E. Inrig, P. Jagam, N. A. Jelley, J. R. Klein, L. L. Kormos, M. S. Kos, A. Krüger, C. Kraus, C. B. Krauss, A. V. Krumins, T. Kutter, C. C. M. Kyba, H. Labranche, R. Lange, J. Law, I. T. Lawson, K. T. Lesko, J. R. Leslie, I. Levine, J. C. Loach, S. Luoma, R. MacLellan, S. Majerus, J. Maneira, A. D. Marino, N. McCauley, A. B. McDonald, S. McGee, C. Mifflin, K. K. S. Miknaitis, B. G. Nickel, A. J. Noble, E. B. Norman, N. S. Oblath, C. E. Okada, H. M. O’Keeffe, R. W. Ollerhead, G. D. Orebi Gann, J. L. Orrell, S. M. Oser, T. Ouvarova, S. J. M. Peeters, A. W. P. Poon, C. S. J. Pun, K. Rielage, B. C. Robertson, R. G. H. Robertson, E. Rollin, S. S. E. Rosendahl, M. H. Schwendener, S. R. Seibert, O. Simard, J. J. Simpson, C. J. Sims, D. Sinclair, L. Sinclair, P. Skensved, M. W. E. Smith, R. G. Stokstad, L. C. Stonehill, R. Tafirout, Y. Takeuchi, G. Tešić, M. Thomson, K. V. Tsang, T. Tsui, R. Van Berg, C. J. Virtue, B. L. Wall, D. Waller, C. E. Waltham, H. Wan Chan Tseung, D. L. Wark, J. Wendland, N. West, J. F. Wilkerson, J. R. Wilson, J. M. Wouters, M. Yeh, and K. Zuber

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Flux, Astrophysics, Solar neutrino problem, 01 natural sciences, Radiation flux, Neutrino detector, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Lepton
Abstract

A search has been made for sinusoidal periodic variations in the 8B solar neutrino flux using data collected by the Sudbury Neutrino Observatory over a 4-year time interval. The variation at a period of 1 yr is consistent with modulation of the 8B neutrino flux by the Earth's orbital eccentricity. No significant sinusoidal periodicities are found with periods between 1 d and 10 years with either an unbinned maximum likelihood analysis or a Lomb-Scargle periodogram analysis. The data are inconsistent with the hypothesis that the results of the recent analysis by Sturrock et al., based on elastic scattering events in Super-Kamiokande, can be attributed to a 7% sinusoidal modulation of the total 8B neutrino flux.

Published
2005
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26. Electron antineutrino search at the Sudbury Neutrino Observatory

Author

S. M. Oser, S. J. M. Peeters, R. W. Ollerhead, V. L. Rusu, B. A. Moffat, Xiaobo Chen, M.G. Boulay, R. L. Helmer, J. A. Dunmore, K.K.S. Miknaitis, Monica Dunford, A. W. P. Poon, S. D. Biller, J. Boger, C. E. Okada, G. Doucas, David A. Sinclair, T. V. Bullard, P. Skensved, J. F. Wilkerson, L. C. Stonehill, N. McCauley, A. L. Hallin, C. Mifflin, Reda Tafirout, R. Van Berg, Darren Grant, P. J. Harvey, S. J. Brice, B. G. Fulsom, C. B. Krauss, N. S. Oblath, M. L. Chen, M. A. Howe, E. D. Hallman, H. Fergani, S. N. Ahmed, G. McGregor, S. S.E. Rosendahl, M. A. Thomson, J. Heise, M. R. Dragowsky, T. J. Bowles, P. J. Doe, R. G. Stokstad, C. K. Hargrove, F. Fleurot, S. Luoma, Malcolm M. Fowler, X. Dai, G. Tešić, I. Levine, S. Majerus, Keith Rielage, A. B. McDonald, Christopher C. M. Kyba, P. Jagam, C. J. Virtue, Joshua R. Klein, R. Lange, Mark Neubauer, B. G. Nickel, A. Krüger, R. G. Van de Water, N. Starinsky, Hal Evans, W. Frati, D. Waller, H. B. Mak, M. S. Kos, A. S. Hamer, W. B. Handler, R. MacLellan, R. L. Hahn, Guthrie Miller, Y. Takeuchi, O. Simard, E. D. Earle, Peter Wittich, B. Aharmim, M. W.E. Smith, F. A. Duncan, S. McGee, B. L. Wall, T. Tsui, J. M. Wouters, J. J. Simpson, C. Ouellet, Eric B. Norman, J. R. Leslie, C. A. Duba, B. C. Robertson, B. T. Cleveland, I. T. Lawson, L. L. Kormos, S. R. Elliott, J. B. Wilhelmy, T. Kutter, G. T. Ewan, G. A. Cox, R. J. Hemingway, N. Gagnon, R. Hazama, C. W. Nally, E. W. Beier, R. S. Dosanjh, E. Rollin, N. West, A. V. Krumins, W. J. Heintzelman, K. T. Lesko, H. Wan Chan Tseung, J. Maneira, H. Labranche, Alain Bellerive, D. L. Wark, Chris Waltham, F. Dalnoki-Veress, A. D. Marino, R. G. H. Robertson, Joseph A. Formaggio, J. Farine, Minfang Yeh, A. J. Noble, J. R. Wilson, N. A. Jelley, Andrew Hime, M. H. Schwendener, J. Law, C. J. Sims, John L. Orrell, Kai Zuber, K. Frame, K. M. Heeger, Yuen-Dat Chan, and K. Graham

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Flux, FOS: Physical sciences, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Neutron, High Energy Physics::Experiment, Neutrino, 010306 general physics, Neutrino oscillation, Nuclear Experiment, Lepton, Bar (unit)
Abstract

Upper limits on the \nuebar flux at the Sudbury Neutrino Observatory have been set based on the \nuebar charged-current reaction on deuterium. The reaction produces a positron and two neutrons in coincidence. This distinctive signature allows a search with very low background for \nuebar's from the Sun and other potential sources. Both differential and integral limits on the \nuebar flux have been placed in the energy range from 4 -- 14.8 MeV. For an energy-independent ��_e --> \nuebar conversion mechanism, the integral limit on the flux of solar \nuebar's in the energy range from 4 -- 14.8 MeV is found to be ��_\nuebar, submitted to Phys. Rev. D

Published
2004

27. Measurement of the Total ActiveB8Solar Neutrino Flux at the Sudbury Neutrino Observatory with Enhanced Neutral Current Sensitivity

Author

R. L. Helmer, P. J. Doe, R. L. Hahn, Monica Dunford, A. W. P. Poon, R. MacLellan, S. R. Elliott, R. W. Ollerhead, E. D. Hallman, G. T. Ewan, J. Maneira, I. T. Lawson, W. B. Handler, Y. Takeuchi, J. F. Wilkerson, J. Boger, J. J. Simpson, D. Waller, Reda Tafirout, Darren Grant, Christopher C. M. Kyba, Yuen-Dat Chan, B. L. Wall, C. K. Hargrove, P. Skensved, C. E. Okada, David A. Sinclair, G. A. Cox, Eric B. Norman, F. A. Duncan, R. S. Dosanjh, B. A. Moffat, K. Graham, E. Rollin, J. R. Leslie, M. W.E. Smith, B. T. Cleveland, J. M. Wouters, R. G. Stokstad, Chris Waltham, M. A. Howe, Malcolm M. Fowler, C. Ouellet, S. M. Oser, H. Fergani, Guthrie Miller, J. A. Dunmore, J. Farine, A. J. Noble, X. Chen, X. Dai, G. Tešić, N. West, A. V. Krumins, R. Lange, S. J. M. Peeters, V. L. Rusu, K.K.S. Miknaitis, W. J. Heintzelman, M.G. Boulay, S. J. Brice, A. S. Hamer, K. T. Lesko, G. McGregor, A. L. Hallin, J. R. Wilson, C. Mifflin, T. V. Bullard, R. J. Hemingway, S. McGee, M. Kos, E. D. Earle, S. D. Biller, Bernie G. Nickel, H. Wan Chan Tseung, I. Levine, N. S. Oblath, E. W. Beier, C. A. Duba, H. Labranche, A. B. McDonald, D. L. Wark, M. R. Dragowsky, F. Dalnoki-Veress, M. H. Schwendener, M. G. Bowler, A. D. Marino, B. G. Fulsom, J. C. Hall, J. Law, R. G. H. Robertson, C. J. Sims, Kai Zuber, C. W. Nally, Andrew Hime, B. C. Robertson, G. Doucas, J. B. Wilhelmy, T. Kutter, C. J. Virtue, N. Gagnon, John L. Orrell, L. C. Stonehill, S. N. Ahmed, R. Hazama, T. J. Bowles, Joseph A. Formaggio, N. McCauley, Minfang Yeh, N. A. Jelley, M. Thorman, R. Van Berg, O. Simard, Hal Evans, K. Frame, Alain Bellerive, K. M. Heeger, M. L. Chen, M. A. Thomson, J. Heise, F. Fleurot, A. E. Anthony, S. Luoma, P. Jagam, Joshua R. Klein, R. G. Van de Water, N. Starinsky, H. B. Mak, S. S.E. Rosendahl, P. J. Harvey, and S. Majerus

Subjects
Physics, Particle physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, General Physics and Astronomy, Flux, Cosmic ray, 7. Clean energy, 01 natural sciences, Nuclear physics, Neutrino detector, 13. Climate action, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, 010306 general physics, Neutrino oscillation, Astrophysics::Galaxy Astrophysics, Lepton
Abstract

The Sudbury Neutrino Observatory has precisely determined the total active (nu(x)) B-8 solar neutrino flux without assumptions about the energy dependence of the nu(e) survival probability. The measurements were made with dissolved NaCl in heavy water to enhance the sensitivity and signature for neutral-current interactions. The flux is found to be 5.21+/-0.27(stat)+/-0.38(syst)x10(6) cm(-2) s(-1), in agreement with previous measurements and standard solar models. A global analysis of these and other solar and reactor neutrino results yields Deltam(2)=7.1(-0.6)(+1.2)x10(-5) eV(2) and theta= 32.5(-2.3)(+2.4) degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.

Published
2004
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28. Measurement of day and night neutrino energy spectra at SNO and constraints on neutrino mixing parameters

Author

J. C. Barton, R. L. Helmer, Monica Dunford, A. W. P. Poon, M. Bercovitch, M. Lay, H. Fergani, J. J. Simpson, P. J. Doe, C. J. Virtue, J. A. Dunmore, R. W. Ollerhead, H. Heron, R. U. Haq, J. Lyon, E. D. Earle, B. A. Moffat, I. Levine, T. J. Radcliffe, G. T. Ewan, W. Locke, J. R. Leslie, B. C. Robertson, A. P. Ferraris, J. X. Wang, V. L. Rusu, K. K. Schaffer, S. D. Biller, A. S. Hamer, B. T. Cleveland, T. Kutter, R. Meijer Drees, N. Tagg, F. A. Duncan, R. J. Ford, P. J. Harvey, N. McCauley, M. C.P. Isaac, M. H. Schwendener, N. Gagnon, Xin Chen, E. Bonvin, R. Hazama, E. D. Hallman, A. J. Noble, R. Van Berg, H. S. Ng, P. M. Thornewell, T. D. Steiger, W. J. Heintzelman, M. L. Chen, A. Roberge, K. McFarlane, P. T. Trent, A. A. Hamian, D. F. Cowen, J. Law, C. J. Sims, Joshua R. Klein, J. V. Germani, D. L. Wark, R. G. Van de Water, N. Starinsky, K. T. Lesko, W. Frati, Q. R. Ahmad, Bhaskar Sur, F. Dalnoki-Veress, T. V. Bullard, P. T. Keener, H. B. Mak, A. D. Marino, I. T. Lawson, Richard T. Kouzes, Anett Schulke, J. Bigu, R. J. Boardman, G. A. Cox, E. W. Beier, M. G. Bowler, J. Heise, C. K. Hargrove, G. McGregor, S. Luoma, J. Boger, Y. I. Tserkovnyak, R. G. Stokstad, N.W. Tanner, D. S. McDonald, A. B. McDonald, M. Shatkay, L. C. Stonehill, J. K. Rowley, M. O'Neill, S. S.E. Rosendahl, G. G. Miller, H. W. Lee, V. M. Novikov, C. W. Nally, Christopher C. M. Kyba, Alan R. Smith, M. Moorhead, G. Jonkmans, E. Saettler, S. Majerus, J. Cameron, H. Seifert, Herbert H. Chen, G. Bühler, J. M. Wouters, E. T.H. Clifford, P. Jagam, C. E. Okada, J. D. Hepburn, M. A. Howe, David A. Sinclair, Yuen-Dat Chan, K. Graham, J. Hewett, S. M. Oser, A. L. Hallin, Andrew Hime, J. Manor, C. Mifflin, J. H.M. Cowan, J. Maneira, I. Blevis, R. L. Hahn, Salvador Gil, G. Doucas, M. Omori, M.G. Boulay, C. Jillings, J. F. Wilkerson, Eric B. Norman, J. R. Wilson, K. Frame, Reda Tafirout, Darren Grant, A. B. Knox, C. A. Duba, K. M. Heeger, Hal Evans, John L. Orrell, W. F. Davidson, J. Farine, R. A. Black, W. B. Handler, Joseph A. Formaggio, Minfang Yeh, N. A. Jelley, N. West, M. Thorman, M. W.E. Smith, M. M. Fowler, M. C. Browne, Steven Elliott, T. C. Andersen, E.D. Frank, R. S. Storey, J. G. Hykawy, R. J. Komar, R. C. Allen, P. Skensved, R. K. Taplin, T. J. Bowles, X. Dai, Mark Neubauer, Chris Waltham, G. Milton, R. G. H. Robertson, T. Spreitzer, F.M. Newcomer, J. D. Anglin, S. J. Brice, Peter Wittich, J. B. Wilhelmy, M. R. Dragowsky, K. Kazkaz, Delon, Viviane, Développement et Communication Chimique chez les Insectes ( DCCI ), and Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, FOS: Physical sciences, General Physics and Astronomy, Flux, Cosmic ray, Astrophysics, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Nuclear astrophysics, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Astrophysics::Galaxy Astrophysics, Charged current, Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Astrophysics (astro-ph), High Energy Physics::Phenomenology, 13. Climate action, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino
Abstract

The Sudbury Neutrino Observatory (SNO) has measured day and night solar neutrino energy spectra and rates. For charged current events, assuming an undistorted $^8$B spectrum, the night minus day rate is $14.0% \pm 6.3% ^{+1.5}_{-1.4}%$ of the average rate. If the total flux of active neutrinos is additionally constrained to have no asymmetry, the $\nu_e$ asymmetry is found to be $7.0% \pm 4.9% ^{+1.3}_{-1.2}%$. A global solar neutrino analysis in terms of matter-enhanced oscillations of two active flavors strongly favors the Large Mixing Angle (LMA) solution., Comment: 5 pages, 4 figures; very minor revisions, accepted by Physical Review Letters

Published
2002

29. Direct evidence for neutrino flavor transformation from neutral-current interactions in the Sudbury Neutrino Observatory

Author

D. S. McDonald, E. D. Earle, J. A. Dunmore, R. U. Haq, Christopher C. M. Kyba, M. C.P. Isaac, V. M. Novikov, T. J. Bowles, G. Jonkmans, E. Saettler, H. Fergani, J. R. Wilson, G. Doucas, E. D. Hallman, M. H. Schwendener, E. Bonvin, R. Hazama, Herbert H. Chen, A. B. Knox, N. McCauley, P. J. Doe, J. Law, P. Jagam, N. W. Tanner, C. J. Sims, J. V. Germani, A. Roberge, H. Heron, A. L. Hallin, R. Van Berg, C. Mifflin, J. B. Wilhelmy, P. T. Trent, H. W. Lee, Joseph A. Formaggio, M. R. Dragowsky, M. M. Fowler, S. D. Biller, J. Hewett, T. V. Bullard, Andrew Hime, T. D. Steiger, R. K. Taplin, M. C. Browne, Minfang Yeh, M. L. Chen, R. L. Hahn, Salvador Gil, K. Kazkaz, A. A. Hamian, J. Farine, G. T. Ewan, K. K. Schaffer, N. A. Jelley, N. West, E. W. Beier, Hal Evans, S. S.E. Rosendahl, E. T.H. Clifford, F.M. Newcomer, M. Lay, R. A. Black, F. A. Duncan, J. D. Anglin, P. J. Harvey, Yuen-Dat Chan, S. J. Brice, K. Graham, D. F. Cowen, C. E. Okada, J. D. Hepburn, R. G. H. Robertson, T. C. Andersen, Steven Elliott, J. J. Simpson, Peter Wittich, David A. Sinclair, E.D. Frank, A. S. Hamer, S. M. Oser, R. G. Stokstad, L. C. Stonehill, J. Maneira, R. G. Van de Water, I. Levine, N. Starinsky, P. M. Thornewell, T. J. Radcliffe, K. Frame, S. Majerus, J. H.M. Cowan, T. Spreitzer, D. L. Wark, J. Cameron, W. J. Heintzelman, Chris Waltham, C. J. Virtue, M. O'Neill, M. Moorhead, R. J. Komar, R. C. Allen, K. T. Lesko, M.G. Boulay, Joshua R. Klein, K. McFarlane, N. Gagnon, K. M. Heeger, I. T. Lawson, W. Frati, John L. Orrell, J. M. Wouters, Bhaskar Sur, B. C. Robertson, F. Dalnoki-Veress, H. B. Mak, Richard T. Kouzes, Q. R. Ahmad, A. P. Ferraris, R. J. Boardman, A. D. Marino, Anett Schulke, J. Bigu, M. Bercovitch, J. X. Wang, P. T. Keener, T. Kutter, R. Meijer Drees, G. A. Cox, V. L. Rusu, A. B. McDonald, R. S. Storey, G. McGregor, M. A. Howe, R. W. Ollerhead, A. J. Noble, H. Seifert, J. Manor, Y. I. Tserkovnyak, J. Lyon, Eric B. Norman, J. Heise, C. K. Hargrove, S. Luoma, M. Thorman, N. Tagg, J. F. Wilkerson, Reda Tafirout, Darren Grant, B. A. Moffat, J. G. Hykawy, W. F. Davidson, J. C. Barton, R. L. Helmer, I. Blevis, M. Omori, Monica Dunford, A. W. P. Poon, R. J. Ford, Xin Chen, P. Skensved, G. Milton, X. Dai, H. S. Ng, Mark Neubauer, M. G. Bowler, W. Locke, J. R. Leslie, J. Boger, B. T. Cleveland, W. B. Handler, M. Shatkay, M. W.E. Smith, Alan R. Smith, C. W. Nally, G. Bühler, C. Jillings, J. K. Rowley, C. A. Duba, G. G. Miller, Développement et Communication Chimique chez les Insectes ( DCCI ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, and Delon, Viviane

Subjects
Particle physics, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Tau neutrino, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Neutrino oscillation, Nuclear Experiment, Physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Solar neutrino problem, Neutrino detector, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Lepton
Abstract

Observations of neutral current neutrino interactions on deuterium in the Sudbury Neutrino Observatory are reported. Using the neutral current, elastic scattering, and charged current reactions and assuming the standard 8B shape, the electron-neutrino component of the 8B solar flux is 1.76 +/-0.05(stat.)+/-0.09(syst.) x10^6/(cm^2 s), for a kinetic energy threshold of 5 MeV. The non-electron neutrino component is 3.41+/-0.45(stat.)+0.48,-0.45(syst.) x10^6/(cm^2 s), 5.3 standard deviations greater than zero, providing strong evidence for solar electron neutrino flavor transformation. The total flux measured with the NC reaction is 5.09 +0.44,-0.43(stat.)+0.46,-0.43(syst.)x10^6/(cm^2 s), consistent with solar models., Comment: 6 pages, 3 figures, correction to author list and minor typographical corrections to references

Published
2002

30. Measurement of CC interactions produced by ${}^8$B solar neutrinos at SNO

Author

H. W. Lee, H. Mes, D. S. McDonald, John Heise, Ilan Levine, J. A. Dunmore, V. M. Novikov, R. U. Haq, Yuen-Dat Chan, J. F. Wilkerson, M. Moorhead, H. S. Ng, J. Cameron, Y. I. Tserkovnyak, Reda Tafirout, A. L. Hallin, E. T.H. Clifford, J. Boger, C. Mifflin, B. T. Cleveland, E. Bonvin, K. McFarlane, Darren Grant, N. Tagg, Christopher C. M. Kyba, C. E. Okada, J. D. Hepburn, S. M. Oser, David A. Sinclair, Hans C. Evans, T. V. Bullard, E. D. Earle, M. C.P. Isaac, R. W. Ollerhead, X. Chen, G. Milton, A. Roberge, N.W. Tanner, J. Lyon, Guthrie Miller, P. Skensved, H. B. Mak, I. Blevis, J. D. Anglin, E. D. Hallman, T. C. Andersen, E. W. Beier, J. H.M. Cowan, R. G. Stokstad, John L. Orrell, Q. R. Ahmad, F. M. Newcomer, C. J. Virtue, E. Saettler, E.D. Frank, Art Mc Donald, W.F. Davidson, Peter Wittich, P. J. Doe, P. Jagam, S. R. Elliott, M. Omori, Herbert H. Chen, G. T. Ewan, K. K. Schaffer, H. Heron, H. Fergani, J. Karn, Y. Dai, R. J. Ford, Klaus Kirch, D. L. Wark, B. A. Moffat, N. Starinsky, R. Heaton, F. A. Duncan, N. McCauley, C. K. Hargrove, J. C. Barton, B. C. Robertson, M. R. Dragowsky, R. K. Taplin, D. F. Cowen, M. G. Boulay, R. L. Hahn, Salvador Gil, F. Dalnoki-Veress, P. T. Trent, A. Goldschmidt, R. S. Storey, G. Doucas, A. S. Hamer, A. D. Marino, A. Knox, N. West, J. R. Leslie, S. D. Biller, R. J. Komar, R. C. Allen, M. W.E. Smith, M. Bercovitch, M. C. Chon, M. O'Neill, M. A. Howe, J. B. Wilhelmy, T. Kutter, R. Meijer Drees, Min Chen, P. J. Harvey, M. Lay, J. Bigu, S. J. Brice, G. McGregor, P. M. Thornewell, W. J. Heintzelman, R. J. Boardman, Richard George Van de Water, G. A. Cox, I. Lawson, T. J. Radcliffe, K. Frame, A. J. Noble, A. W. P. Poon, Malcolm M. Fowler, P. T. Keener, K. T. Lesko, J. J. Simpson, T. J. Bowles, K. M. Heeger, Eric B. Norman, G. Jonkmans, J. M. Wouters, H. Seifert, S. Luoma, A. Schuelke, Minfang Yeh, A. B. McDonald, N. A. Jelley, M. Thorman, A. P. Ferraris, J. X. Wang, V. L. Rusu, K. Cameron, J. G. Hykawy, J. Hewett, Andrew Hime, M. H. Schwendener, W. McLatchie, M. M. Lowry, J. Law, Jochen Klein, J. V. Germani, J. Farine, M. G. Bowler, M. C. Browne, T.H. Burritt, R. A. Black, G. Bühler, A. R. Smith, R. L. Helmer, W. Locke, J. K. Rowley, M. Shatkay, R. Van Berg, C. W. Nally, T. D. Steiger, A. A. Hamian, C. Jillings, Ryuta Hazama, Chris Waltham, S. Majerus, C. A. Duba, R. G. H. Robertson, W. Frati, Bhaskar Sur, Richard T. Kouzes, James R. Wilson, X. Dai, and Mark Neubauer

Subjects
Nuclear physics, Physics, Angular distribution, Solar neutrino, Neutrino oscillation, Charged current
Published
2001
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31. Measurement of the Rate ofνe+d→p+p+e−Interactions Produced byB8Solar Neutrinos at the Sudbury Neutrino Observatory

Author

G. Jonkmans, Y. Dai, J. M. Wouters, A. Goldschmidt, M. G. Bowler, J. Boger, M. Shatkay, John L. Orrell, R. G. Stokstad, C. W. Nally, P. Skensved, M. M. Fowler, J. C. Barton, X. Dai, M. C. Browne, Mark Neubauer, C. Jillings, C. A. Duba, B. C. Robertson, R. L. Helmer, Yuen-Dat Chan, P. Jagam, N. W. Tanner, A. L. Hallin, Chris Waltham, C. Mifflin, Steven Elliott, T. Kutter, J. B. Wilhelmy, H. W. Lee, R. Meijer Drees, R. K. Taplin, M. R. Dragowsky, S. M. Oser, K. Frame, R. U. Haq, N. McCauley, C. K. Hargrove, F.M. Newcomer, R. G. H. Robertson, J. D. Anglin, S. J. Brice, J. H.M. Cowan, C. J. Virtue, M. Moorhead, Peter Wittich, I. Blevis, T. C. Andersen, R. Heaton, S. Luoma, K. M. Heeger, F. A. Duncan, A. Schuelke, R. J. Ford, J. Cameron, M. Omori, R. S. Storey, M. A. Howe, Xin Chen, E.D. Frank, K. McFarlane, Minfang Yeh, N. A. Jelley, N. West, M. W.E. Smith, Q. R. Ahmad, Klaus Kirch, R. Van Berg, M. H. Schwendener, P. T. Trent, J. F. Wilkerson, Reda Tafirout, Mark Guy Boulay, Darren Grant, W. McLatchie, G. Milton, W. F. Davidson, J. Heise, J. G. Hykawy, H. Mes, E. T.H. Clifford, N. Tagg, H. S. Ng, J. Law, J. V. Germani, M. O'Neill, R. G. Van de Water, T. D. Steiger, N. Starinsky, R. J. Bardman, R. J. Komar, R. C. Allen, M. L. Chen, M. C. Chon, H. Seifert, J. Hewett, A. A. Hamian, Andrew Hime, J. Karn, I. T. Lawson, C. E. Okada, J. D. Hepburn, T. J. Bowles, W. Locke, J. R. Leslie, Eric B. Norman, David A. Sinclair, B. T. Cleveland, J. Bigu, G. McGregor, G. A. Cox, R. L. Hahn, Salvador Gil, K. Cameron, Alan R. Smith, J. R. Wilson, M. M. Lowry, H. Fergani, T.H. Burritt, J. A. Dunmore, G. Bühler, S. Majerus, S. D. Biller, Hal Evans, Joshua R. Klein, M. Lay, A. B. Knox, P. J. Harvey, D. S. McDonald, W. Frati, Bhaskar Sur, J. K. Rowley, A. S. Hamer, H. B. Mak, P. M. Thornewell, Richard T. Kouzes, J. J. Simpson, G. Doucas, V. M. Novikov, Y. I. Tserkovnyak, G. G. Miller, W. J. Heintzelman, E. D. Earle, P. T. Keener, K. T. Lesko, M. Thorman, J. Farine, M. C.P. Isaac, G. T. Ewan, K. K. Schaffer, R. A. Black, E. D. Hallman, E. Bonvin, A. B. McDonald, Christopher C. M. Kyba, R. Hazama, P. J. Doe, D. L. Wark, T. V. Bullard, A. Roberge, H. Heron, E. Saettler, E. W. Beier, F. Dalnoki-Veress, A. D. Marino, Herbert H. Chen, M. Bercovitch, D. F. Cowen, A. J. Noble, I. Levine, T. J. Radcliffe, A. W. P. Poon, A. P. Ferraris, J. X. Wang, V. L. Rusu, R. W. Ollerhead, J. Lyon, and B. A. Moffat

Subjects
Nuclear reaction, Physics, Particle physics, Sudbury Neutrino Observatory, 010308 nuclear & particles physics, Solar neutrino, General Physics and Astronomy, Flux, 01 natural sciences, 7. Clean energy, Nuclear physics, Massless particle, 13. Climate action, 0103 physical sciences, Neutrino, 010306 general physics, Charged current, Lepton
Abstract

Solar neutrinos from the decay of 8B have been detected at the Sudbury Neutrino Observatory (SNO) via the charged current (CC) reaction on deuterium and by the elastic scattering (ES) of electrons. The CC reaction is sensitive exclusively to νe, while the ES reaction also has a small sensitivity to νμ and ντ. The flux of νe from 8B decay measured by the CC reaction rate is φCC(ν e )=[1.75±0.07(stat.) −0.11 +0.12 (syst.)×0.05(theor.)]×106cm−2s−1. Assuming no flavor transformation, the flux inferred from the ES reaction rate is φES(ν x )=[2.39±0.34(stat.) −0.14 +0.16 (syst.)]×106cm−2s−1. Comparison of φCC(νe) to the Super-Kamiokande collaboration’s precision value of φES(νx) yields a 3.3σ difference, assuming the systematic uncertainties are normally distributed, providing evidence that there is a nonelectron flavor active neutrino component in the solar flux. The total flux of active 8B neutrinos is thus determined to be (5.44±0.99)×106 cm−2 s−1, in close agreement with the predictions of solar models.

Published
2001
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32. Measurements of photomultiplier single photon counting efficiency for the Sudbury Neutrino Observatory

Author

N. A. Jelley, M. Thorman, T.H Ward, Nigel Fox, and S. D. Biller

Subjects
Physics, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Photomultiplier, Photon, business.industry, Physics::Instrumentation and Detectors, Solar neutrino, Counting efficiency, Astrophysics::Instrumentation and Methods for Astrophysics, Photon counting, Optics, Calibration, business, Instrumentation, Cherenkov radiation
Abstract

A knowledge of the absolute efficiency of the photomultiplier tubes (PMTs) used in the Sudbury Neutrino Observatory (SNO) is important for modelling the behaviour of the detector. While the quantum efficiencies for the PMTs are known, the efficiency in single-photon counting mode (which includes collection efficiency and counting efficiency) is of more relevance. A calibration of the 8 in. Hamamatsu R1408 photomultipliers in this mode requires a known flux of incident light at the very low level of 10 −16 W cm −2 (250 photons cm−2 s−1). A method of performing such measurements, utilising the extreme linearity obtainable with silicon photodiodes, is presented in this paper. The results of efficiency measurements on four PMTs are given and a comparison is made with previous results obtained using a Cherenkov source of known intensity.

Published
1999

33. Determining the Low Energy Backgrounds at the Sudbury Neutrino Observatory

Author

B. Aharmim, H.M. OʼKeeffe, J. Farine, N. A. Jelley, R. Ford, J.T.M. Goon, and S. R. Seibert

Subjects
Physics, Heavy water, Nuclear and High Energy Physics, Sudbury Neutrino Observatory, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Physics::Medical Physics, Atomic and Molecular Physics, and Optics, Physics::Geophysics, Nuclear physics, chemistry.chemical_compound, Low energy, chemistry, Photodisintegration, Beta (plasma physics), Neutron, Nuclear Experiment, Cherenkov radiation
Abstract

Naturally occurring radioisotopes can produce neutrons by photodisintegration and Cherenkov events via beta/gamma decays. The techniques used to measure the radioisotopes in the heavy water target and light water shield in the third phase of SNO is discussed. © 2011 Elsevier B.V.

Published
2011
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34. Experimental limits on particle dark-matter candidates

Author

N. A. Jelley

Subjects
Physics, Particle physics, Detector, Dark matter, Magnetic monopole, Particle, Neutrino, Photino
Abstract

The experimental limits on some of the particle candidates for the dark matter are discussed. The main part of the paper is about neutrinos, which are the only particles known to exist that are possible candidates, and the present evidence about neutrino mass is reviewed. This is followed by a discussion of the limits on two candidates that have provoked considerable experimental interest: the magnetic monopole, and the supersymmetric particle, the photino. The paper concludes with a brief account of a recently developed calorimetric detector and of its possible use in detecting dark-matter candidates, such as the photino.

Published
1986
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35. A comparison of Woods-Saxon and double-folding potentials for lithium scattering from light target nuclei

Author

N A Jelley, C L Woods, and B A Brown

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Phonon scattering, Scattering, General Physics and Astronomy, Scattering theory, Radius, Atomic physics, Inelastic scattering, Small-angle neutron scattering, Nuclear density
Abstract

Elastic scattering data are presented for 6Li at 36 MeV from 12O and 26Mg and for 7Li at 28.8 MeV from 15N and at 27 MeV from 25Mg over the range 15-95 degrees in the centre-of-mass frame. Microscopic optical potentials are generated for these scattering systems using the double-folding model. The sensitivity of the potentials to the prescriptions used for the nuclear density calculations is studied. The elastic scattering data are analysed within the framework of the optical model using both Woods-Saxon potentials and double-folding model real potentials with Woods-Saxon imaginary wells. Equally good fits to the data are obtained with the phenomenological and microscopic potentials. The double-folding potentials must be normalised by factors of 0.5 or 0.6 to fit the data in all cases except for 6Li scattering from 16O, for which a normalisation of 0.8 is favoured. These results are supplemented by those from an inelastic scattering analysis using DWBA and the collective rotational model for the first 2+ states in 12C and 26Mg. The shapes of the phenomenological and microscopic potentials around the strong absorption radius are compared and the gradients are found to differ significantly for 7Li+15N and 6Li+ 12C systems.

Published
1982
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36. The oxford MDM-2 magnetic spectrometer

Author

N. A. Jelley, J.H. Coupland, J.S. Winfield, D.G. Lewis, D.M. Pringle, K.W. Allen, and W.N. Catford

Subjects
Physics, Nuclear and High Energy Physics, Dipole, Nuclear magnetic resonance, Field (physics), Spectrometer, Dipole magnet, Magnet, Solid angle, Radius, Multipole expansion, Instrumentation, Computational physics
Abstract

A new high resolution magnetic spectrometer — the Oxford MDM-2 spectrometer — has been designed, installed and tested. The layout of the magnetic elements is in the order: entrance sextupole and multipole, gradient-field dipole and exit multipole. The device has a “normal” focal plane, and the 1.6 m radius dipole magnet has a maximum mass-energy product of 315 MeV amu. At the maximum solid angle of 8 msr, the ratio of energies that can be accepted by the spectrometer (Emax/Emin) is 1.31. Precide measurements have been performed on the magnetic elements. The dipole magnet has very low hysteresis and field integral errors that amount to less than 1 part in 104. After some in situ modifications the field distributions of the magnets closely approximated the original design specifications. On-line tests with various ion-beams have revealed the optimum setting for each element. These are close to theoretical predictions from the program RAYTRACE, incorporating the parameterised results of the magnetic measurements. An aberration limited resolution (E/ΔE) of greater than 3000 has been observed at 8 msr solid angle.

Published
1986
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37. The 5− resonance in the 16O(α, γ)20Ne reaction at Eα = 4.65 MeV

Author

A.E. Litherland, D.W.O. Rogers, B.Y. Underwood, K.W. Allen, N. A. Jelley, and Hal Evans

Subjects
Physics, Nuclear and High Energy Physics, Transition strength, SHELL model, Radiative transfer, Resonance, Atomic physics
Abstract

A resonance at E α = 4647 keV in the 16 O(α, γ) 20 Ne reaction has been located and assigned to a 5 − state in 20 Ne at 8447 ± 3 KeV. The radiative width of the 5 − to 3 − transition has been measured and found to be 13 ± 3 meV corresponding to a transition strength of 26 ± 6 Weisskopf units. Comparisons are made with rotational and shell model predictions.

Published
1971
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38. Decay of the 15.22 MeV, T=2 state in 28Si

Author

M.R. Wormald, N. A. Jelley, N. Anyas-Weiss, K.W. Allen, and B.Y. Underwood

Subjects
Physics, Nuclear and High Energy Physics, Gamma ray, State (functional analysis), Atomic physics, Nuclear isomer, Excitation
Abstract

The γ -ray decay of the lowest T =2 state (0 + ) in 28 Si at has been investigated with a Ge(Li) detector using the reaction 24 Mg (α,γ) 28 Si . Transitions to 1 + , T =1 levels in 28 Si at 11445 ± 3 (40%), 10901 ± 3 (43%), 10724 ± 3 (9%, T =(1)) and 10598 ± 3 (8%, T =(1)) keV excitation were observed and a comparison is made with a simple shell-model description of the T =2 and T =1 levels. Limits have been placed on Γ γ 1 and Γ p o and values are given for Γ , Γ α 1 , Γ p 1 and Γ p 2 .

Published
1972
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39. 53Com: A proton-unstable isomer

Author

J. Cerny, C. U. Cardinal, Hal Evans, K.P. Jackson, and N. A. Jelley

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Decay scheme, Proton, Half-life, Atomic physics, Proton emission
Abstract

A 1.53±0.04 MeV proton activity with a 245±20 ms half-life has been observed in the reaction of 16O on 40Ca. The most plausible origin of this activity is the proton radioactivity of 53Com, although the decay of this isomer by beta-delayed proton emission remains a possibility.

Published
1970
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40. X-RAY-SPECTRA OF H-LIKE, HE-LIKE AND LI-LIKE SILICON IONS AFTER FOIL EXCITATION

Author

R O'Brien, J. D. Silver, Elmar Träbert, S Bashkin, I A Armour, and N A Jelley

Subjects
Physics, Silicon, chemistry, Spectrometer, Excited state, chemistry.chemical_element, Plasma, Atomic physics, Atomic and Molecular Physics, and Optics, Excitation, Spectral line, FOIL method, Ion
Abstract

Radiation emitted from silicon beams at 35, 38 and 45 MeV excited by passage through thin carbon foils has been studied in the range 3-9 AA using a curved-crystal X-ray spectrometer. More than 100 lines have been observed, of which only one quarter had been observed or predicted from solar or laboratory plasma spectra. Most of the previously unobserved lines may be attributed to satellites of H- and He-like transitions arising in three- and four-electron Si ions. The lifetime of the Si XIII 23P1 state has been measured, and a preliminary experimental value of 6.5+or-1.3 ps obtained.

Published
1979

41. IMPROVED LIGHT COLLECTION FROM FAST ATOMIC BEAMS

Author

J. D. Silver, N A Jelley, and I A Armour

Subjects
Coupling, Physics, Light source, Optics, business.industry, Optoelectronics, Grating spectrometer, business, Image resolution, Atomic and Molecular Physics, and Optics, Beam (structure), Spectral line
Abstract

A simple and practical arrangement of coupling lenses for viewing a fast beam light source with a grating spectrometer is shown to provide very efficient light collection with good spectral and spatial resolution together with a simple procedure for calibrating spectra.

Published
1977

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