Direct evidence for neutrino flavor transformation from neutral-current interactions in the Sudbury Neutrino Observatory -: art. no. 011301

被引:2458
作者
Ahmad, QR [1 ]
Allen, RC
Andersen, TC
Anglin, JD
Barton, JC
Beier, EW
Bercovitch, M
Bigu, J
Biller, SD
Black, RA
Blevis, I
Boardman, RJ
Boger, J
Bonvin, E
Boulay, MG
Bowler, MG
Bowles, TJ
Brice, SJ
Browne, MC
Bullard, TV
Bühler, G
Cameron, J
Chan, YD
Chen, HH
Chen, M
Chen, X
Cleveland, BT
Clifford, ETH
Cowan, JHM
Cowen, DF
Cox, GA
Dai, X
Dalnoki-Veress, F
Davidson, WF
Doe, PJ
Doucas, G
Dragowsky, MR
Duba, CA
Duncan, FA
Dunford, M
Dunmore, JA
Earle, ED
Elliott, SR
Evans, HC
Ewan, GT
Farine, J
Fergani, H
Ferraris, AP
Ford, RJ
Formaggio, JA
机构
[1] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA
[2] Univ Washington, Dept Phys, Seattle, WA 98195 USA
[3] Univ London Birkbeck Coll, London WC1E 7HX, England
[4] Atom Energy Canada Ltd, Chalk River Labs, Chalk River, ON K0J 1J0, Canada
[5] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[6] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA
[7] Univ Calif Irvine, Dept Phys, Irvine, CA 92717 USA
[8] Carleton Univ, Ottawa, ON K1S 5B6, Canada
[9] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada
[10] Laurentian Univ, Dept Phys & Astron, Sudbury, ON P3E 2C6, Canada
[11] Univ Calif Berkeley, Lawrence Berkeley Lab, Inst Nucl & Particle Astrophys, Berkeley, CA 94720 USA
[12] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA
[13] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[14] Natl Res Council Canada, Ottawa, ON K1A 0R6, Canada
[15] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[16] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[17] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[18] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
[19] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[20] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England
[21] TRIUMF, Vancouver, BC V6T 2A3, Canada
关键词
D O I
10.1103/PhysRevLett.89.011301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Observations of neutral-current nu interactions on deuterium in the Sudbury Neutrino Observatory are reported. Using the neutral current (NC), elastic scattering, and charged current reactions and assuming the standard B-8 shape, the nu(e) component of the B-8 solar flux is phi(e)=1.76(-0.05)(+0.05)( stat)(+0.09)(-0.09)( syst)x10(6) cm(-2) s(-1) for a kinetic energy threshold of 5 MeV. The non-nu(e) component is phi(mutau)=3.41(+0.45) (-0.45)(stat)(+0.48) (-0.45)(syst)x10(6) cm(-2) s(-1) , 5.3sigma greater than zero, providing strong evidence for solar nu(e) flavor transformation. The total flux measured with the NC reaction is phi(NC)=5.09(-0.43)(+0.44) (stat)(+0.46)(-0.43) (syst)x10(6) cm (-2) s (-1) , consistent with solar models.
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页数:6
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