LAGUNA and LAGUNA-LBNO: Future megaton neutrino detectors in Europe

The FP7 Design Studies LAGUNA (Large Apparatus studying Grand Unification and Neutrino Astrophysics) and LAGUNA-LBNO (Large Apparatus studying Grand Unification and Neutrino Astrophysics and Long Baseline Neutrino Oscillations) are studying Pan-European research infrastructures in deep underground cavities able to host a very large multipurpose next-generation neutrino observatory. These future megaton scale detectors are dedicated to nucleon decay, neutrinos from supernovæ, solar and atmospheric neutrinos, as well as neutrinos from a future Super-Beam or β-Beam to measure the mixing angle θ13, the CP violating phase δ and the mass hierarchy.