Title:  "Direct Evidence for Neutrino Flavor Transformation from 
Neutral-Current Interactions in the Sudbury Neutrino Observatory"

Abstract:

The Sudbury Neutrino Observatory (SNO) is an imaging Cherenkov detector 
using 1000 tonnes of heavy water (D$_2$O) located 2 km underground in an 
active nickel mine near Sudbury, Canada.  It is designed to detect $^8$B 
solar neutrinos through the charged-current (CC) and the neutral-current 
(NC) interactions on the deuteron, and the elastic scattering (ES) 
interaction on the electron.  The CC interaction is sensitive only to 
the electron-type neutrinos, whereas the NC and ES interactions have 
sensitivity to all active neutrino flavors. This ability to 
simultaneously measure the electron-type neutrino flux and the total 
active neutrino flux allows solar-model independent tests of neutrino 
oscillation to be made.  Latest results from the pure D$_2$O phase, 
including the first NC measurement, of the SNO experiment will be 
presented.    These results provide direct evidence that the 
transformation of electron-type neutrinos to non-electron type neutrinos 
occur.  The physics implications of these measurements will be 
discussed.