Determination of the νe and total B8 solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

Aharmim, B. and Ahmad, Q. and Ahmed, S. and Allen, R. and Andersen, T. and Anglin, J. and Bühler, G. and Barton, J. and Beier, E. and Bercovitch, M. and Bergevin, M. and Bigu, J. and Biller, S. and Black, R. and Blevis, I. and Boardman, R. and Boger, J. and Bonvin, E. and Boulay, M. and Bowler, M. and Bowles, T. and Brice, S. and Browne, M. and Bullard, T. and Burritt, T. and Cameron, J. and Chan, Y. and Chen, H. and Chen, M. and Chen, X. and Cleveland, B. and Cowan, J. and Cowen, D. and Cox, G. and Currat, C. and Dai, X. and Dalnoki-veress, F. and Davidson, W. and Deng, H. and Dimarco, M. and Doe, P. and Doucas, G. and Dragowsky, M. and Duba, C. and Duncan, F. and Dunford, M. and Dunmore, J. and Earle, E. and Kormos, L. and O'Keeffe, H. (2007) Determination of the νe and total B8 solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set. Physical Review C, 75 (4). ISSN 0556-2813

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Abstract

This article provides the complete description of results from the Phase I data set of the Sudbury Neutrino Observatory (SNO). The Phase I data set is based on a 0.65 kiloton-year exposure of 2H2O (in the following denoted as D2O) to the solar B8 neutrino flux. Included here are details of the SNO physics and detector model, evaluations of systematic uncertainties, and estimates of backgrounds. Also discussed are SNO's approach to statistical extraction of the signals from the three neutrino reactions (charged current, neutral current, and elastic scattering) and the results of a search for a day-night asymmetry in the νe flux. Under the assumption that the B8 spectrum is undistorted, the measurements from this phase yield a solar νe flux of ϕ(νe)=1.76+0.05−0.05(stat.)+0.09−0.09(syst.)×106 cm−2 s−1 and a non-νe component of ϕ(νμτ)=3.41+0.45−0.45(stat.)+0.48−0.45(syst.)×106 cm−2 s−1. The sum of these components provides a total flux in excellent agreement with the predictions of standard solar models. The day-night asymmetry in the νe flux is found to be Ae=7.0±4.9(stat.)+1.3−1.2%(syst.), when the asymmetry in the total flux is constrained to be zero.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review C
Additional Information:
© 2007 The American Physical Society
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
69613
Deposited By:
Deposited On:
12 Jun 2014 13:30
Refereed?:
Yes
Published?:
Published
Last Modified:
05 Jul 2020 04:07