A proposed search for a fourth neutrino with a PBq antineutrino source
  Several observed anomalies in neutrino oscillation data can be explained by a hypothetical fourth neutrino separated from the three standard neutrinos by a squared mass difference of a few eV^2. We show that this hypothesis can be tested with a PBq (ten kilocurie scale) 144Ce or 106Ru antineutrino beta-source deployed at the center of a large low background liquid scintillator detector. In particular, the compact size of such a source could yield an energy-dependent oscillating pattern in event spatial distribution that would unabiguously determine neutrino mass differences and mixing angles. 
Michel Cribier, Maximilien Fechner, Thierry Lasserre, Alain   Letourneau, David Lhuillier, Guillaume Mention, Davide Franco,...
hep-ex nucl-ex