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The recent experimental determinations of a large theta_13 angle have openedthe way to a determination of the mass hierarchy and of the CP-violating phase.Experiments based on horn produced (anti-)neutrino conventional beams arepresently under development. The event rates are marginal for a definitivesearch, since they require very intense beams and extremely large detectormasses. Zucchelli has proposed a method in which pure (anti-)nu_e beams aregenerated by the beta-decay of relativistic radio-nuclides stored in a highenergy storage ring pointing towards a far away neutrino detector. Since theyhave a much smaller transverse momentum distribution, the neutrino flux will bemuch more narrowly concentrated than with a horn. The isomeric doublet Li-8(anti-nu_e, tau_1/2=0.84s) and B-8 (nu_e, tau_1/2=0.77s) has been studied.Neutrino and antineutrino beams are produced with an average transversemomentum of about 6.5 MeV/c. Radioactive ions may be generated with a dedicatedtable-top storage ring to supply a suitable ion source to be accelerated athigh energies either at FNAL or at CERN. Ions should then extracted from theaccelerator and accumulated in a decay storage ring with a long straightsection pointing toward the neutrino detector. A massive detector based onliquid Argon technology is probably offering the best opportunities for suchfuture programme. The present ICARUS LAr-TPC experiment has already collectedat LNGS events in the relevant neutrino energy region. They should provide afirst evidence for a conclusive experimental study of the competing signals andmore generally for the actual feasibility of the beta-beam option in a searchof the CP violating phase. Additional data may be provided in the near futurewith the ICARUS and MicroBooNe neutrino experiments located at a short distanceneutrino beam and that will collect a much larger number of neutrino events.

Long distance nu_e -> nu_mu transitions and CP-violation with high intensity beta-beams