skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Determination of the {nu}{sub e} and total {sup 8}B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set

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 {sup 2}H{sub 2}O (in the following denoted as D{sub 2}O) to the solar {sup 8}B 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 {nu}{sub e} flux. Under the assumption that the {sup 8}B spectrum is undistorted, the measurements from this phase yield a solar {nu}{sub e} flux of {phi}({nu}{sub e})=1.76{sub -0.05}{sup +0.05}(stat.){sub -0.09}{sup +0.09}(syst.)x10{sup 6} cm{sup -2} s{sup -1} and a non-{nu}{sub e} component of {phi}({nu}{sub {mu}}{sub {tau}})=3.41{sub -0.45}{sup +0.45}(stat.){sub -0.45}{sup +0.48}(syst.)x10{sup 6} cm{sup -2} s{sup -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 {nu}{sub e} flux is found to be A{sub e}=7.0{+-}4.9(stat.){sub -1.2}{sup +1.3}%(syst.), when the asymmetry in the total fluxmore » is constrained to be zero.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ; ;  [2]
  1. Department of Physics and Astronomy, Laurentian University, Sudbury, Ontario P3E 2C6 (Canada)
  2. Center for Experimental Nuclear Physics and Astrophysics, and Department of Physics, University of Washington, Seattle, Washington 98195 (United States) (and others)
Publication Date:
OSTI Identifier:
20995235
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.75.045502; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; BORON 8; ELECTRON NEUTRINOS; HEAVY WATER; NEUTRINO REACTIONS; SOLAR NEUTRINOS; STAR MODELS; SUDBURY NEUTRINO OBSERVATORY

Citation Formats

Aharmim, B., Bigu, J., Cowan, J. H. M., Farine, J., Fleurot, F., Hallman, E. D., Haq, R. U., Hewett, J., Hykaway, J. G., Krueger, A., Luoma, S., Roberge, A., Saettler, E., Schwendener, M. H., Tafirout, R., Virtue, C. J., Ahmad, Q. R., Bullard, T. V., Burritt, T. H., and Cox, G. A. Determination of the {nu}{sub e} and total {sup 8}B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.045502.
Aharmim, B., Bigu, J., Cowan, J. H. M., Farine, J., Fleurot, F., Hallman, E. D., Haq, R. U., Hewett, J., Hykaway, J. G., Krueger, A., Luoma, S., Roberge, A., Saettler, E., Schwendener, M. H., Tafirout, R., Virtue, C. J., Ahmad, Q. R., Bullard, T. V., Burritt, T. H., & Cox, G. A. Determination of the {nu}{sub e} and total {sup 8}B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set. United States. doi:10.1103/PHYSREVC.75.045502.
Aharmim, B., Bigu, J., Cowan, J. H. M., Farine, J., Fleurot, F., Hallman, E. D., Haq, R. U., Hewett, J., Hykaway, J. G., Krueger, A., Luoma, S., Roberge, A., Saettler, E., Schwendener, M. H., Tafirout, R., Virtue, C. J., Ahmad, Q. R., Bullard, T. V., Burritt, T. H., and Cox, G. A. Sun . "Determination of the {nu}{sub e} and total {sup 8}B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set". United States. doi:10.1103/PHYSREVC.75.045502.
@article{osti_20995235,
title = {Determination of the {nu}{sub e} and total {sup 8}B solar neutrino fluxes using the Sudbury Neutrino Observatory Phase I data set},
author = {Aharmim, B. and Bigu, J. and Cowan, J. H. M. and Farine, J. and Fleurot, F. and Hallman, E. D. and Haq, R. U. and Hewett, J. and Hykaway, J. G. and Krueger, A. and Luoma, S. and Roberge, A. and Saettler, E. and Schwendener, M. H. and Tafirout, R. and Virtue, C. J. and Ahmad, Q. R. and Bullard, T. V. and Burritt, T. H. and Cox, G. A.},
abstractNote = {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 {sup 2}H{sub 2}O (in the following denoted as D{sub 2}O) to the solar {sup 8}B 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 {nu}{sub e} flux. Under the assumption that the {sup 8}B spectrum is undistorted, the measurements from this phase yield a solar {nu}{sub e} flux of {phi}({nu}{sub e})=1.76{sub -0.05}{sup +0.05}(stat.){sub -0.09}{sup +0.09}(syst.)x10{sup 6} cm{sup -2} s{sup -1} and a non-{nu}{sub e} component of {phi}({nu}{sub {mu}}{sub {tau}})=3.41{sub -0.45}{sup +0.45}(stat.){sub -0.45}{sup +0.48}(syst.)x10{sup 6} cm{sup -2} s{sup -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 {nu}{sub e} flux is found to be A{sub e}=7.0{+-}4.9(stat.){sub -1.2}{sup +1.3}%(syst.), when the asymmetry in the total flux is constrained to be zero.},
doi = {10.1103/PHYSREVC.75.045502},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}