Measurement of the Solar Neutrino Flux with an Array of Neutron Detectors in the Sudbury Neutrino Observatory
Abstract
The Sudbury Neutrino Observatory has measured the 8B solar neutrino flux using an array of 3He proportional counters. Results obtained using a Markov-Chain Monte-Carlo (MCMC) parameter estimation, integrating over a standard extended likelihood, yield effective neutrino fluxes of: phinc=5.54+0.33-0.31(stat)+0.36-0.34(syst) x 106 /cm2/s, phicc=1.67+0.05-0.04(stat)+0.07-0.08(syst) x 106 /cm2/s, and phies=1.77+0.24-0.21(stat)+0.09-0.10(syst) x 106 /cm2/s. These measurements are in agreement with previous solar neutrino flux measurements, and with neutrino oscillation model results. Including these flux measurements in a global analysis of solar and reactor neutrino results yields an improved precision on the solar neutrino mixing angle of theta=34.4+1.3-1.2 degrees, and Delta m2=7.59+0.19-0.21 eV2.