Date: Wednesday 3rd December 2003
Title: The NuMI Off-Axis Experiment
Speaker: Dr Alfons Weber (RAL)
Neutrino oscillations are now a well-established phenomenon in particle physics. Current experiments have or shortly will measure the parameters for the dominant oscillation modes. We are planning an experiment to measure the subdominant numu to nue oscillation probability, which is related to the so far unknown neutrino mixing angle theta13. The experiment will use the (soon) existing NuMI neutrino beam, which is aimed from Fermilab to the MINOS experiment in northern Minnesota. The detector, made from 50 kton low "Z" absorber, will be at a distance of 712-980 km on the surface and slightly off axis. The angle will be optimised to maximise the neutrino flux at the oscillation maximum. This experiment will be best suited to measure numu to nue oscillation probabilities at a frequency corresponding to the atmospheric delta m2. It will have some ability to determine the neutrino mass hierarchy and to measure CP violation. This detector may take data as soon as 2008. In a second phase we plan to increase the product of neutrino flux and detector mass by a factor of five. The physics potential and the detector technologies will be discussed.