Low-energy-threshold analysis of the Phase I and Phase II data sets of the Sudbury Neutrino Observatory

被引:216
作者
Aharmim, B. [1 ]
Ahmed, S. N. [15 ]
Anthony, A. E. [18 ]
Barros, N. [9 ]
Beier, E. W. [14 ]
Bellerive, A. [5 ]
Beltran, B. [2 ]
Bergevin, M. [6 ,7 ,8 ]
Biller, S. D. [13 ]
Boudjemline, K. [5 ]
Boulay, M. G. [15 ]
Burritt, T. H. [20 ,21 ]
Cai, B. [15 ]
Chan, Y. D. [7 ,8 ]
Chauhan, D. [1 ]
Chen, M. [15 ]
Cleveland, B. T. [13 ]
Cox, G. A. [20 ,21 ]
Dai, X. [5 ,13 ,15 ]
Deng, H. [14 ]
Detwiler, J. [7 ,8 ]
DiMarco, M. [15 ]
Doe, P. J. [20 ,21 ]
Doucas, G. [13 ]
Drouin, P-L. [5 ]
Duba, C. A. [20 ,21 ]
Duncan, F. A. [15 ,17 ]
Dunford, M. [14 ]
Earle, E. D. [15 ]
Elliott, S. R. [10 ,20 ,21 ]
Evans, H. C. [15 ]
Ewan, G. T. [15 ]
Farine, J. [1 ,5 ]
Fergani, H. [13 ]
Fleurot, F. [1 ]
Ford, R. J. [15 ,17 ]
Formaggio, J. A. [12 ,20 ,21 ]
Gagnon, N. [7 ,8 ,10 ,13 ,20 ,21 ]
Goon, J. Tm [11 ]
Graham, K. [5 ,15 ]
Guillian, E. [15 ]
Habib, S. [2 ]
Hahn, R. L. [4 ]
Hallin, A. L. [2 ]
Hallman, E. D. [1 ]
Harvey, P. J. [15 ]
Hazama, R. [20 ,21 ]
Heintzelman, W. J. [14 ]
Heise, J. [3 ,10 ,15 ]
Helmer, R. L. [19 ]
机构
[1] Laurentian Univ, Dept Phys & Astron, Sudbury, ON P3E 2C6, Canada
[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2R3, Canada
[3] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[4] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA
[5] Carleton Univ, Ottawa Carleton Inst Phys, Dept Phys, Ottawa, ON K1S 5B6, Canada
[6] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada
[7] Lawrence Berkeley Natl Lab, Inst Nucl & Particle Astrophys, Berkeley, CA 94720 USA
[8] Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA
[9] Lab Instrumentacao & Fis Expt Particulas, Lisbon, Portugal
[10] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[11] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
[12] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA
[13] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[14] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[15] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
[16] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[17] SNOLAB, Sudbury, ON P3Y 1M3, Canada
[18] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA
[19] TRIUMF, Vancouver, BC V6T 2A3, Canada
[20] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA
[21] Univ Washington, Dept Phys, Seattle, WA 98195 USA
来源
PHYSICAL REVIEW C | 2010年 / 81卷 / 05期
基金
美国国家科学基金会; 加拿大创新基金会; 加拿大自然科学与工程研究理事会; 英国科学技术设施理事会;
关键词
CALIBRATION SOURCE; OSCILLATIONS; MATTER;
D O I
10.1103/PhysRevC.81.055504
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
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.).
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