Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....3.1239k&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
The Sudbury Neutrino Observatory (SNO) is an imaging water Cherenkov detector. It has detected solar neutrinos from the decay of 8 bvia the charged current (CC) and neutral current (NC) reactions on deuterium and by the elastic scattering (ES) of electrons. While the CC reaction is exclusively sensitive to νe , the NC reaction is equally sensitive to all types of active neutrinos. In its first phase of running with pure D2 O the non-νe component of the NC flux was found to be greater than zero at the 5.3 σ level, providing strong evidence for νe flavor transformation. A global solar neutrino analysis in terms of matterenhanced oscillations favors the Large Mixing Angle (LMA) solution to the solar neutrino problem. In the second phase NaCl has been added to the D2 O in order to increase the NC sensitivity. Data acquisition of the salt phase is nearly complete and first results on the NC measurement of this phase are expected to be presented at this conference. The third operational phase of SNO foresees the deployment of neutral current detectors (NCD) inside the D2 O volume and hence allows an indep endent measurement of the NC.
Kutter Thomas
Sudbury Neutrino Observatory Collaboration
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