Several anomalies observed 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 eV2.
We show that this hypothesis can be tested with a PBq (ten kilocurie scale) 144Ce antineutrino beta source deployed at the center of the KamLAND detector.
In particular, the compactness of such a...