Rights statement: © 2010 The American Physical Society
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory
AU - Aharmim, B.
AU - Ahmed, S. N.
AU - Anthony, A. E.
AU - Barros, N.
AU - Beier, E. W.
AU - Bellerive, A.
AU - Beltran, B.
AU - Bergevin, M.
AU - Biller, S. D.
AU - Boudjemline, K.
AU - Boulay, M. G.
AU - Burritt, T. H.
AU - Cai, B.
AU - Chan, Y. D.
AU - Chauhan, D.
AU - Chen, M.
AU - Cleveland, B. T.
AU - Cox, G. A.
AU - Dai, X.
AU - Deng, H.
AU - Detwiler, J.
AU - DiMarco, M.
AU - Doe, P. J.
AU - Doucas, G.
AU - Drouin, P-L.
AU - Duba, C. A.
AU - Duncan, F. A.
AU - Dunford, M.
AU - Earle, E. D.
AU - Elliott, S. R.
AU - Evans, H. C.
AU - Ewan, G. T.
AU - Farine, J.
AU - Fergani, H.
AU - Fleurot, F.
AU - Ford, R. J.
AU - Formaggio, J. A.
AU - Gagnon, N.
AU - Goon, J. Tm
AU - Graham, K.
AU - Guillian, E.
AU - Habib, S.
AU - Hahn, R. L.
AU - Hallin, A. L.
AU - Hallman, E. D.
AU - Harvey, P. J.
AU - Hazama, R.
AU - Heintzelman, W. J.
AU - O'Keeffe, Helen
AU - SNO Collaboration
AU - Kormos, Laura
N1 - © 2010 The American Physical Society
PY - 2010/5
Y1 - 2010/5
N2 - 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 = 3.5MeV, the lowest analysis threshold yet achieved with water Cherenkov detector data. In units of 106 cm(-2) s(-1), the total flux of active-flavor neutrinos from B-8 decay in the Sun measured using the neutral current (NC) reaction of neutrinos on deuterons, with no constraint on the B-8 neutrino energy spectrum, is found to be Phi(NC) = 5.140(-0.158)(+0.160)(stat)(-0.117)(+0.132)(syst). These uncertainties are more than a factor of 2 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 Sudbury Neutrino Observatory data in which the free parameters directly describe the total B-8 neutrino flux and the energy-dependent nu(e) survival probability provides a measure of the total B-8 neutrino flux Phi(8B) = 5.046(-0.152)(+0.159)(stat)(-0.123)(+0.107)(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(-0.84)(+1.16) degrees and Delta m(21)(2) = 7.59(-0.21)(+0.20) 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(-1.63)(+2.09) x 10(-2). This implies an upper bound of sin(2) theta(13) < 0.057 (95% C.L.).
AB - 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 = 3.5MeV, the lowest analysis threshold yet achieved with water Cherenkov detector data. In units of 106 cm(-2) s(-1), the total flux of active-flavor neutrinos from B-8 decay in the Sun measured using the neutral current (NC) reaction of neutrinos on deuterons, with no constraint on the B-8 neutrino energy spectrum, is found to be Phi(NC) = 5.140(-0.158)(+0.160)(stat)(-0.117)(+0.132)(syst). These uncertainties are more than a factor of 2 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 Sudbury Neutrino Observatory data in which the free parameters directly describe the total B-8 neutrino flux and the energy-dependent nu(e) survival probability provides a measure of the total B-8 neutrino flux Phi(8B) = 5.046(-0.152)(+0.159)(stat)(-0.123)(+0.107)(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(-0.84)(+1.16) degrees and Delta m(21)(2) = 7.59(-0.21)(+0.20) 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(-1.63)(+2.09) x 10(-2). This implies an upper bound of sin(2) theta(13) < 0.057 (95% C.L.).
KW - CALIBRATION SOURCE
KW - PHYSICS
KW - MATTER
KW - OSCILLATIONS
UR - http://www.scopus.com/inward/record.url?scp=77953305252&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.81.055504
DO - 10.1103/PhysRevC.81.055504
M3 - Journal article
VL - 81
SP - -
JO - Physical Review C
JF - Physical Review C
SN - 0556-2813
IS - 5
M1 - 055504
ER -