A Monochromatic electron neutrino beam

In the last few years spectacular results have been achieved with the demonstration of non vanishing neutrino masses and flavour mixing. Here, a novel method to create a monochromatic neutrino beam, an old dream for neutrino physics, is described based on the recent discovery of nuclei with fast decay through electron-capture to Gamow-Teller resonances in super allowed transitions. Such nuclei will generate a monochromatic directional neutrino beam when decaying at high energy in a storage ring with long straight sections. A facility for generating neutrino beams through nuclear decay is under study within the EURISOL Design Study within the 7 th European research framework programme. However, the required electron-capture facility will need a different approach to acceleration and storage of the ion beam compared to the standard beta-beam, as the ions cannot be fully stripped. Electron-capture decay requires partly charged ions which will have a short vacuum life-time due to a large cross-section for stripping through collisions with rest gas molecules in the accelerators. First results for production cross-sections, ion cooling and accumulation schemes and stacking schemes will be presented together with a descriptions of the on-going work on the standard beta-beam facility.