Phys. Rev. Lett.
87,
071301
(2001)
[6 pages]
Measurement of the Rate of νe+d→p+p+e- Interactions Produced by 8B Solar Neutrinos at the Sudbury Neutrino Observatory
Q. R. Ahmad et al. (SNO Collaboration)
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Q. R. Ahmad15, R. C. Allen11, T. C. Andersen12, J. D. Anglin7, G. Bühler11, J. C. Barton13,*, E. W. Beier14, M. Bercovitch7, J. Bigu4, S. Biller13, R. A. Black13, I. Blevis3, R. J. Boardman13, J. Boger2, E. Bonvin9, M. G. Boulay9, M. G. Bowler13, T. J. Bowles6, S. J. Brice6,13, M. C. Browne15, T. V. Bullard15, T. H. Burritt15,6, K. Cameron12, J. Cameron13, Y. D. Chan5, M. Chen9, H. H. Chen11,†, X. Chen5,13, M. C. Chon12, B. T. Cleveland13, E. T. H. Clifford9,1, J. H. M. Cowan4, D. F. Cowen14, G. A. Cox15, Y. Dai9, X. Dai13, F. Dalnoki-Veress3, W. F. Davidson7, P. J. Doe15,11,6, G. Doucas13, M. R. Dragowsky6,5, C. A. Duba15, F. A. Duncan9, J. Dunmore13, E. D. Earle9,1, S. R. Elliott15,6, H. C. Evans9, G. T. Ewan9, J. Farine3, H. Fergani13, A. P. Ferraris13, R. J. Ford9, M. M. Fowler6, K. Frame13, E. D. Frank14, W. Frati14, J. V. Germani15,6, S. Gil10, A. Goldschmidt6, D. R. Grant3, R. L. Hahn2, A. L. Hallin9, E. D. Hallman4, A. Hamer6,9, A. A. Hamian15, R. U. Haq4, C. K. Hargrove3, P. J. Harvey9, R. Hazama15, R. Heaton9, K. M. Heeger15, W. J. Heintzelman14, J. Heise10, R. L. Helmer10,‡, J. D. Hepburn9,1, H. Heron13, J. Hewett4, A. Hime6, M. Howe15, J. G. Hykawy4, M. C. P. Isaac5, P. Jagam12, N. A. Jelley13, C. Jillings9, G. Jonkmans4,1, J. Karn12, P. T. Keener14, K. Kirch6, J. R. Klein14, A. B. Knox13, R. J. Komar10,9, R. Kouzes8, T. Kutter10, C. C. M. Kyba14, J. Law12, I. T. Lawson12, M. Lay13, H. W. Lee9, K. T. Lesko5, J. R. Leslie9, I. Levine3, W. Locke13, M. M. Lowry8, S. Luoma4, J. Lyon13, S. Majerus13, H. B. Mak9, A. D. Marino5, N. McCauley13, A. B. McDonald9,8, D. S. McDonald14, K. McFarlane3, G. McGregor13, W. McLatchie9, R. Meijer Drees15, H. Mes3, C. Mifflin3, G. G. Miller6, G. Milton1, B. A. Moffat9, M. Moorhead13,5, C. W. Nally10, M. S. Neubauer14, F. M. Newcomer14, H. S. Ng10, A. J. Noble3,§, E. B. Norman5, V. M. Novikov3, M. O'Neill3, C. E. Okada5, R. W. Ollerhead12, M. Omori13, J. L. Orrell15, S. M. Oser14, A. W. P. Poon5,6,10,15, T. J. Radcliffe9, A. Roberge4, B. C. Robertson9, R. G. H. Robertson15,6, J. K. Rowley2, V. L. Rusu14, E. Saettler4, K. K. Schaffer15, A. Schuelke5, M. H. Schwendener4, H. Seifert4,6,15, M. Shatkay3, J. J. Simpson12, D. Sinclair3, P. Skensved9, A. R. Smith5, M. W. E. Smith15, N. Starinsky3, T. D. Steiger15, R. G. Stokstad5, R. S. Storey7,**, B. Sur1,9, R. Tafirout4, N. Tagg12, N. W. Tanner13, R. K. Taplin13, M. Thorman13, P. Thornewell6,13,15, P. T. Trent13,††, Y. I. Tserkovnyak10, R. Van Berg14, R. G. Van de Water14,6, C. J. Virtue4, C. E. Waltham10, J.-X. Wang12, D. L. Wark13,6,‡‡, N. West13, J. B. Wilhelmy6, J. F. Wilkerson15,6, J. Wilson13, P. Wittich14, J. M. Wouters6, and M. Yeh2 (SNO Collaboration)
1Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario K0J 1J0 Canada
2Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000
3Carleton University, Ottawa, Ontario K1S 5B6 Canada
4Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6 Canada
5Institute for Nuclear and Particle Astrophysics and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
6Los Alamos National Laboratory, Los Alamos, New Mexico 87545
7National Research Council of Canada, Ottawa, Ontario K1A 0R6 Canada
8Department of Physics, Princeton University, Princeton, New Jersey 08544
9Department of Physics, Queen's University, Kingston, Ontario K7L 3N6 Canada
10Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1 Canada
11Department of Physics, University of California, Irvine, California 92717
12Physics Department, University of Guelph, Guelph, Ontario N1G 2W1 Canada
13Nuclear and Astrophysics Laboratory, University of Oxford, Keble Road, Oxford, OX1 3RH, United Kingdom
14Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6396
15Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, Washington 98195
Received 18 June 2001; published 25 July 2001
Solar neutrinos from 8B decay have been detected at the Sudbury Neutrino Observatory via the charged current (CC) reaction on deuterium and the elastic scattering (ES) of electrons. The flux of νe’s is measured by the CC reaction rate to be φCC(νe) = 1.75±0.07(stat)-0.11+0.12(syst)±0.05(theor)×106cm-2s-1. Comparison of φCC(νe) to the Super-Kamiokande Collaboration’s precision value of the flux inferred from the ES reaction yields a 3.3σ difference, assuming the systematic uncertainties are normally distributed, providing evidence of an active non- νe component in the solar flux. The total flux of active 8B neutrinos is determined to be 5.44±0.99×106cm-2s-1.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.071301
DOI:
10.1103/PhysRevLett.87.071301
PACS:
26.65.+t, 14.60.Pq, 95.85.Ry
*Permanent address: Birkbeck College, University of London, Malet Road, London WC1E 7HX, UK. †Deceased. ‡Permanent address: TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada. § ** †† ‡‡Permanent address: Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, and University of Sussex, Physics and Astronomy Department, Brighton BN1 9QH, United Kingdom.
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