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19 results on '"C E, Okada"'

1. 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

2. 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

3. 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

4. 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

5. 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

6. 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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7. 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

8. 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

9. 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

10. 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

11. Measurement of the total active 8B solar neutrino flux at the Sudbury Neutrino Observatory with enhanced neutral current sensitivity

Author

S N, Ahmed, A E, Anthony, E W, Beier, A, Bellerive, S D, Biller, J, Boger, M G, Boulay, M G, Bowler, T J, Bowles, S J, Brice, T V, Bullard, Y D, Chan, M, Chen, X, Chen, B T, Cleveland, G A, Cox, X, Dai, F, Dalnoki-Veress, P J, Doe, R S, Dosanjh, G, Doucas, M R, Dragowsky, 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, M M, Fowler, K, Frame, B G, Fulsom, N, Gagnon, K, Graham, D R, Grant, R L, Hahn, J C, Hall, A L, Hallin, E D, Hallman, A S, Hamer, W B, Handler, C K, Hargrove, P J, Harvey, R, Hazama, K M, Heeger, W J, Heintzelman, J, Heise, R L, Helmer, R J, Hemingway, A, Hime, M A, Howe, P, Jagam, N A, Jelley, J R, Klein, M S, Kos, 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, 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, G G, Miller, B A, Moffat, C W, Nally, 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, B C, Robertson, R G H, Robertson, E, Rollin, S S E, Rosendahl, V L, Rusu, M H, Schwendener, 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, Tesić, M, Thomson, M, Thorman, 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, N, West, J B, Wilhelmy, J F, Wilkerson, J R, Wilson, J M, Wouters, M, Yeh, and K, Zuber

Abstract

The Sudbury Neutrino Observatory has precisely determined the total active (nu(x)) 8B 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) x 10(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(+1.2)(-0.6) x 10(-5) eV(2) and theta=32.5(+2.4)(-2.3) degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.

Published
2004

12. High Sensitivity Search forν¯e’s from the Sun and Other Sources at KamLAND

Author

J. Maricic, K. Ishii, A. Kozlov, K. Tada, C. R. Gould, J. G. Learned, T. Maeda, I. Shimizu, A. Suzuki, Petr Vogel, B. D. Dieterle, K. T. Lesko, J. A. Detwiler, R. Svoboda, Z. Djurcic, K. M. Heeger, C. Mauger, H. M. Steiner, Hitoshi Murayama, G. A. Horton-Smith, D. A. Dwyer, M. J. Chen, T. Mitsui, K. Ishihara, B. Tipton, Osamu Tajima, Sandip Pakvasa, C. E. Okada, A. Piepke, N. Tolich, Dongming Mei, Yasuhiro Kishimoto, Y. F. Wang, Giorgio Gratta, G. Guillian, K. Furuno, B. K. Fujikawa, K. Eguchi, J. Busenitz, K. Tamae, M. DiMauro, Yuri Kamyshkov, Kiyohiro Ikeda, Y. Fu, Yu. Efremenko, T. Iwamoto, T. Miletic, Lindley Winslow, Ryan Rohm, Y. Nakamura, A. W. P. Poon, T. Kawashima, F. Suekane, Kunio Inoue, W. M. Bugg, C. E. Lane, J. A. Messimore, M. P. Decowski, F. Piquemal, S. Hatakeyama, Hiroshi Ogawa, Kam-Biu Luk, E. Yakushev, Y. Uchida, Peter Gorham, Sanshiro Enomoto, T. Takayama, R. D. McKeown, D. R. Nygren, Werner Tornow, J. Goldman, K. Owada, Hugon J Karwowski, K. Nakamura, H. Ikeda, D. M. Markoff, M. Motoki, Y. D. Chan, K. Nakajima, J. Shirai, B. E. Berger, M. Batygov, S. Dazeley, Hideki Watanabe, Y. Koseki, Albert Young, K. McKinny, Stuart J. Freedman, S. Matsuno, and M. Koga

Subjects
Physics, Particle physics, Energy spectrum, General Physics and Astronomy, Sensitivity (control systems), Energy (signal processing)
Abstract

Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used to search for ${\overline{\ensuremath{\nu}}}_{e}$'s in the energy range $8.3l{E}_{{\overline{\ensuremath{\nu}}}_{e}}l14.8\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$. No candidates were found for an expected background of $1.1\ifmmode\pm\else\textpm\fi{}0.4$ events. This result can be used to obtain a limit on ${\overline{\ensuremath{\nu}}}_{e}$ fluxes of any origin. Assuming that all ${\overline{\ensuremath{\nu}}}_{e}$ flux has its origin in the Sun and has the characteristic $^{8}\mathrm{B}$ solar ${\ensuremath{\nu}}_{e}$ energy spectrum, we obtain an upper limit of $3.7\ifmmode\times\else\texttimes\fi{}{10}^{2}\text{ }\text{ }{\mathrm{c}\mathrm{m}}^{\ensuremath{-}2}\text{ }{\mathrm{s}}^{\ensuremath{-}1}$ (90% C.L.) on the ${\overline{\ensuremath{\nu}}}_{e}$ flux. We interpret this limit, corresponding to $2.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ of the standard solar model $^{8}\mathrm{B}$ ${\ensuremath{\nu}}_{e}$ flux, in the framework of spin-flavor precession and neutrino decay models.

Published
2004

13. High sensitivity search for nu;e's from the sun and other sources at KamLAND

Author

K, Eguchi, S, Enomoto, K, Furuno, H, Ikeda, K, Ikeda, K, Inoue, K, Ishihara, T, Iwamoto, T, Kawashima, Y, Kishimoto, M, Koga, Y, Koseki, T, Maeda, T, Mitsui, M, Motoki, K, Nakajima, H, Ogawa, K, Owada, F, Piquemal, I, Shimizu, J, Shirai, F, Suekane, A, Suzuki, K, Tada, O, Tajima, T, Takayama, K, Tamae, H, Watanabe, J, Busenitz, Z, Djurcic, K, McKinny, D-M, Mei, A, Piepke, E, Yakushev, B E, Berger, Y D, Chan, M P, Decowski, D A, Dwyer, S J, Freedman, Y, Fu, B K, Fujikawa, J, Goldman, K M, Heeger, K T, Lesko, K-B, Luk, H, Murayama, D R, Nygren, C E, Okada, A W P, Poon, H M, Steiner, L A, Winslow, G A, Horton-Smith, C, Mauger, R D, McKeown, B, Tipton, P, Vogel, C E, Lane, T, Miletic, P W, Gorham, G, Guillian, J G, Learned, J, Maricic, S, Matsuno, S, Pakvasa, S, Dazeley, S, Hatakeyama, R, Svoboda, B D, Dieterle, M, DiMauro, J, Detwiler, G, Gratta, K, Ishii, N, Tolich, Y, Uchida, M, Batygov, W, Bugg, Y, Efremenko, Y, Kamyshkov, A, Kozlov, Y, Nakamura, C R, Gould, H J, Karwowski, D M, Markoff, J A, Messimore, K, Nakamura, R M, Rohm, W, Tornow, A R, Young, M-J, Chen, and Y-F, Wang

Abstract

Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used to search for nu;(e)'s in the energy range 8.3E(nu;(e))14.8 MeV. No candidates were found for an expected background of 1.1+/-0.4 events. This result can be used to obtain a limit on nu;(e) fluxes of any origin. Assuming that all nu;(e) flux has its origin in the Sun and has the characteristic 8B solar nu(e) energy spectrum, we obtain an upper limit of 3.7 x 10(2) cm(-2) s(-1) (90% C.L.) on the nu;(e) flux. We interpret this limit, corresponding to 2.8 x 10(-4) of the standard solar model 8B nu(e) flux, in the framework of spin-flavor precession and neutrino decay models.

Published
2003

14. 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

15. Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in SNO

Author

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

Subjects
Physics, Particle physics, Sudbury Neutrino Observatory, Neutral current, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::Cosmology and Extragalactic Astrophysics, Solar neutrino problem, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Nuclear Experiment, Neutrino oscillation, Charged current
Abstract

The Sudbury Neutrino Observatory (SNO) is a 1,000 tonne heavy water Cerenkov‐based neutrino detector situated 2,000 meters underground in INCO’s Creighton Mine near Sudbury, Ontario, Canada. For the neutrinos from 8B decay in the Sun SNO observes the Charged Current neutrino reaction sensitive only to electron neutrinos and others (Neutral Current and Elastic Scattering) sensitive to all active neutrino types and thereby can search for direct evidence of neutrino flavor change. Using these reactions and assuming the standard 8B shape, the ve component of the 8B solar flux is φe = 1.76−0.05+0.05(stat.)−0.09+0.09 (syst.) × 106 cm−2s−1 for a kinetic energy threshold of 5 MeV. The non‐ve component is φμτ = 3.41−0.45+0.45(stat.)−0.45+0.48 (syst.) × 106 cm−2s−1, 5.3σ greater than zero, providing strong evidence for solar ve flavor transformation. The total flux measured with the NC reaction is φNC = 5.09−0.43+0.44(stat.)−0.43+0.46 (syst.) × 106 cm−2s−1, consistent with solar models. For charged current events, ...

Published
2002

16. 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

17. 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

18. 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

19. First results from KamLAND: Evidence for reactor antineutrino disappearance

Author

T. Takayama, S. Matsuno, M. Koga, A. Kozlov, Yuri Kamyshkov, Petr Vogel, B. E. Berger, Hideki Watanabe, S. Dazeley, M. P. Decowski, Hugon J Karwowski, A. W. P. Poon, M. Murakami, F. Suekane, Dongming Mei, T. Iwamoto, Giorgio Gratta, Albert Young, W. Itoh, Lindley Winslow, Sandip Pakvasa, J. Busenitz, Y. Nakamura, John G. Learned, Ryan Rohm, S. Hatakeyama, E. Yakushev, H. O. Cohn, D. A. Dwyer, Stuart J. Freedman, K. Furuno, T. Kawashima, Yasuhiro Kishimoto, W. M. Bugg, Osamu Tajima, J. Maricic, C. E. Lane, D. M. Markoff, T. Sakabe, Yuri Efremenko, K. T. Lesko, H. Ikeda, Hiroshi Ogawa, J. Ritter, Y. Uchida, K. Nakajima, Peter Gorham, K. Tada, Y. F. Wang, Y. D. Chan, Kiyohiro Ikeda, J. Goldman, K. Ishihara, C. E. Okada, Tomoya Kawaguchi, D. R. Nygren, Y. Koseki, K. B. Luk, B. Tipton, J. A. Detwiler, G. Guillian, I. Shimizu, B. D. Dieterle, K. Eguchi, K. M. Heeger, M. Motoki, Y. Fu, K. McKinny, H. M. Steiner, B. K. Fujikawa, T. Nakajima, Hitoshi Murayama, G. A. Horton-Smith, M. Batygov, Werner Tornow, K. Ishii, M. Nakajima, Kunio Inoue, J. A. Messimore, T. Maeda, A. Suzuki, L. De Braeckeleer, R. Svoboda, T. Mitsui, N. Tolich, Koji Nakamura, Z. Djurcic, A. Piepke, Sanshiro Enomoto, H. Kinoshita, M. DiMauro, T. Miletic, K. Owada, R. D. McKeown, H. Hanada, J. Shirai, C. R. Gould, and K. Tamae

Subjects
Physics, Particle physics, Sudbury Neutrino Observatory, Geoneutrino, Solar neutrino, High Energy Physics::Phenomenology, FOS: Physical sciences, General Physics and Astronomy, Context (language use), Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Neutrino, Neutrino oscillation, Nuclear Experiment, Lepton
Abstract

KamLAND has been used to measure the flux of $\bar{\nu}_e$'s from distant nuclear reactors. In an exposure of 162 ton$\cdot$yr (145.1 days) the ratio of the number of observed inverse $\beta$-decay events to the expected number of events without disappearance is $0.611\pm 0.085 {\rm (stat)} \pm 0.041 {\rm (syst)} $ for $\bar{\nu}_e$ energies $>$ 3.4 MeV. The deficit of events is inconsistent with the expected rate for standard $\bar{\nu}_e$ propagation at the 99.95% confidence level. In the context of two-flavor neutrino oscillations with CPT invariance, these results exclude all oscillation solutions but the `Large Mixing Angle' solution to the solar neutrino problem using reactor $\bar{\nu}_e$ sources., Comment: 6 pages, 6 figures

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