Are you guys using an underground tank of water also? I read neutrinos can pass through solid lead a light year thick and not interact with any of it. Detecting them is a monstrous effort. Are they considered W.I.M.P. particles?\n\n\nAll the neutrino experiments are underground to shield them from stray neutrinos not produced by our experiments, but we've moved on from water to other scinitllation materials such as mineral oil. Neutrinos are not WIMP's because they aren't considered massive. They rarely interact with other particles, but it does happen. If you had enough neutrinos passing through that light year of solid lead you would have some interactions. How you'd detect them in solid lead is another feat on it's own though!