Independent Measurement of the Total ActiveB8Solar Neutrino Flux Using an Array ofHe3Proportional Counters at the Sudbury Neutrino Observatory
Copyright policy )Independent Measurement of the Total ActiveB8Solar Neutrino Flux Using an Array ofHe3Proportional Counters at the Sudbury Neutrino Observatory
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(+0.33/-0.31 stat, +0.36/-0.34 syst) x 10^6 cm^-2 s^-1, in agreement with previous measurements and standard solar models. A global analysis of solar and reactor neutrino results yields Delta m^2 = 7.59(+0.19/-0.21) x 10^-5 eV^2 and theta = 34.4(+1.3/-1.2) degrees. The uncertainty on the mixing angle has been reduced from SNO's previous results.
5 pages, 2 figures, version accepted by Phys Rev Lett, added latest KamLAND 2881 ton-year data and 192 day Borexino data
- University of Hong Kong China (People's Republic of)
- University of Hong Kong (香港大學) China (People's Republic of)
- Department of Physics and Astronomy University of Western Ontario Canada
- Lawrence Berkeley National Laboratory United States
- University of Hong Kong China (People's Republic of)
Observatories, SNO Collaboration, FOS: Physical sciences, Heavy Water, Counting Circuits, Proportional Counters, Solar Radiation, High Energy Physics, Buildings, Nuclear Experiment (nucl-ex), Nuclear Experiment
Observatories, SNO Collaboration, FOS: Physical sciences, Heavy Water, Counting Circuits, Proportional Counters, Solar Radiation, High Energy Physics, Buildings, Nuclear Experiment (nucl-ex), Nuclear Experiment
