We propose to construct a massive detector to search for neutrino oscillations and other neutrino-induced reactions, as a comprehensive test of the Standard Model of particle physics, at the Spallation Neutron Source proposed to be built at the Oak Ridge National Laboratory (ORNL). The principal motivation of the experiment is to perform a class of experiments to rigorously test the validity of the Standard Model of particle physics using neutrinos as probes. The experiment will search for the appearance of  produced in the beam stop from muons decaying at rest. It will also search for  oscillations with extraordinarily high sensitivity. This level of sensitivity is required in order to reduce the uncertainty of the results down to what is inevitable in view of the natural process itself. The recently reported neutrino oscillation signal observed by the LSND experiment can also be scrutinized by more than two orders of magnitude, thus reaching the inherent limit of such experiments.
 

The detector will also be sensitive to the disappearance of  when the second proton storage ring is complete. Furthermore, the proposed detector will yield high-statistics neutrino-electron scattering data and, due to the fast-spill nature of the beam, a precise measurement of  will be possible.

The detector is to be used in conjunction with the newly proposed high-intensity short-beam-spill spallation source. The experiment will yield data with high statistical precision and small systematic errors because of the precise measurement of the known ++  cross section. The proposed detector makes it also possible to measure with very high precision other neutrino cross sections that are of interest to fundamental physics as well as nuclear physics and astrophysics.
 
 
 

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