Beta Beams

Beta Beams could address the needs of long term neutrino oscillation experiments. They can produce extremely pure neutrino beams through the decays of relativistic radioactive ions. The baseline scenario is described, together with its physics performances. Using a megaton water Čerenkov detector installed under the Fréjus, Beta Beams could improve by a factor 200 the present limits on sin22θ13 and discover leptonic CP violating effects if the CP phase δ would be greater than 30° and θ13 greater than 1°. These performances can be further improved if a neutrino SuperBeam generated by the SPL 4MW, 2.2 GeV, proton Linac would be fired to the same detector. Innovative ideas on higher and lower energy Beta Beams are also described.