Making muon rings round neutrino factories

A new way of making neutrino beams has caught the attention of physicists worldwide. The muon storage ring as neutrino source, nicknamed "neutrino factory", requires a much lower density of particles and should thus be easier to build than a muon collider. The decay of muons into electrons provides the only known source of high-energy electron-type neutrinos-a unique and powerful new physics tool. Storage rings, neutrino physics and CP violation studies are discussed. (0 refs).