Phys. Rev. Lett.
92,
181301
(2004)
[6 pages]
Measurement of the Total Active 8B Solar Neutrino Flux at the Sudbury Neutrino Observatory with Enhanced Neutral Current Sensitivity
S. N. Ahmed et al. SNO Collaboration
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S. N. Ahmed10, A. E. Anthony14, E. W. Beier9, A. Bellerive3, S. D. Biller8, J. Boger2, M. G. Boulay7, M. G. Bowler8, T. J. Bowles7, S. J. Brice7, T. V. Bullard13, Y. D. Chan6, M. Chen10, X. Chen6, B. T. Cleveland8, G. A. Cox13, X. Dai3,8, F. Dalnoki-Veress3, P. J. Doe13, R. S. Dosanjh3, G. Doucas8, M. R. Dragowsky7, C. A. Duba13, F. A. Duncan10, M. Dunford9, J. A. Dunmore8, E. D. Earle10, S. R. Elliott7, H. C. Evans10, G. T. Ewan10, J. Farine5,3, H. Fergani8, F. Fleurot5, J. A. Formaggio13, M. M. Fowler7, K. Frame8,3, B. G. Fulsom10, N. Gagnon13,7,6,8, K. Graham10, D. R. Grant3, R. L. Hahn2, J. C. Hall14, A. L. Hallin10, E. D. Hallman5, A. S. Hamer7,*, W. B. Handler10, C. K. Hargrove3, P. J. Harvey10, R. Hazama13, K. M. Heeger6, W. J. Heintzelman9, J. Heise7, R. L. Helmer12,1, R. J. Hemingway3, A. Hime7, M. A. Howe13, P. Jagam4, N. A. Jelley8, J. R. Klein14,9, M. S. Kos10, A. V. Krumins10, T. Kutter1, C. C. M. Kyba9, H. Labranche4, R. Lange2, J. Law4, I. T. Lawson4, K. T. Lesko6, J. R. Leslie10, I. Levine3,†, S. Luoma5, R. MacLellan10, S. Majerus8, H. B. Mak10, J. Maneira10, A. D. Marino6, N. McCauley9, A. B. McDonald10, S. McGee13, G. McGregor8, C. Mifflin3, K. K. S. Miknaitis13, G. G. Miller7, B. A. Moffat10, C. W. Nally1, B. G. Nickel4, A. J. Noble10,3,12, E. B. Norman6, N. S. Oblath13, C. E. Okada6, R. W. Ollerhead4, J. L. Orrell13, S. M. Oser1,9, C. Ouellet10, S. J. M. Peeters8, A. W. P. Poon6, B. C. Robertson10, R. G. H. Robertson13, E. Rollin3, S. S. E. Rosendahl6, V. L. Rusu9, M. H. Schwendener5, O. Simard3, J. J. Simpson4, C. J. Sims8, D. Sinclair3,12, P. Skensved10, M. W. E. Smith13, N. Starinsky3, R. G. Stokstad6, L. C. Stonehill13, R. Tafirout5, Y. Takeuchi10, G. Tešić3, M. Thomson10, M. Thorman8, R. Van Berg9, R. G. Van de Water7, C. J. Virtue5, B. L. Wall13, D. Waller3, C. E. Waltham1, H. Wan Chan Tseung8, D. L. Wark11, N. West8, J. B. Wilhelmy7, J. F. Wilkerson13, J. R. Wilson8, J. M. Wouters7, M. Yeh2, and K. Zuber8 (SNO Collaboration)
1Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 Canada
2Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
3Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6 Canada
4Physics Department, University of Guelph, Guelph, Ontario N1G 2W1 Canada
5Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6 Canada
6Institute for Nuclear and Particle Astrophysics and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
7Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
8Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, United Kingdom
9Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396, USA
10Department of Physics, Queen’s University, Kingston, Ontario K7L 3N6 Canada
11Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, and University of Sussex, Physics and Astronomy Department, Brighton BN1 9QH, United Kingdom
12TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
13Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, Washington 98195, USA
14Department of Physics, University of Texas at Austin, Austin, Texas 78712-0264, USA
Received 6 September 2003; published 3 May 2004
The Sudbury Neutrino Observatory has precisely determined the total active (νx) 8B solar neutrino flux without assumptions about the energy dependence of the νe 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)×106 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 Δm2=7.1-0.6+1.2×10-5 eV2 and θ=32.5-2.3+2.4 degrees. Maximal mixing is rejected at the equivalent of 5.4 standard deviations.
© 2004 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.181301
DOI:
10.1103/PhysRevLett.92.181301
PACS:
26.65.+t, 14.60.Pq, 95.85.Ry
*Deceased. †Present address: Department of Physics and Astronomy, Indiana University, South Bend, IN, USA.
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