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Independent measurement of the total active 8B solar neutrino flux using an array of 3He proportional counters at the Sudbury Neutrino Observatory |
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| Authors: | Aharmim B Ahmed S N Amsbaugh J F Anthony A E Banar J Barros N Beier E W Bellerive A Beltran B Bergevin M Biller S D Boudjemline K Boulay M G Bowles T J Browne M C Bullard T V Burritt T H Cai B Chan Y D Chauhan D Chen M Cleveland B T Cox-Mobrand G A Currat C A Dai X Deng H Detwiler J DiMarco M Doe P J Doucas G Drouin P-L Duba C A Duncan F A Dunford M Earle E D Elliott S R Evans H C Ewan G T Farine J Fergani H Fleurot F Ford R J Formaggio J A Fowler M M Gagnon N Germani J V Goldschmidt A Goon J T M Graham K Guillian E Habib S Hahn R L Hallin A L Hallman E D Hamian A A Harper G C Harvey P J |
| Institution: | Department of Physics and Astronomy, Laurentian University, Sudbury, ON P3E 2C6, Canada. |
| Abstract: | The Sudbury Neutrino Observatory (SNO) used an array of 3He proportional counters to measure the rate of neutral-current interactions in heavy water and precisely determined the total active (nu_x) 8B solar neutrino flux. This technique is independent of previous methods employed by SNO. The total flux is found to be 5.54_-0.31;+0.33(stat)-0.34+0.36(syst)x10(6) cm(-2) s(-1), in agreement with previous measurements and standard solar models. A global analysis of solar and reactor neutrino results yields Deltam2=7.59_-0.21;+0.19x10(-5) eV2 and theta=34.4_-1.2;+1.3 degrees. The uncertainty on the mixing angle has been reduced from SNO's previous results. |
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