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Five years in the coldest fridge in the known Universe

Nature Podcast

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Thetm's Neutrinals Double Bata Decay Detector Is Made of Roman Lead

Cosmic rays are protons and nuclei that rain down on us from space. They can spoof the signature of neutrinalstauble bata decay. So an experiment was placed deep underground, underneath grand sasso mountains in italy. The most internal shield of the qar experimenter is made of ancient roman lead. It's very dense, but contains a otope that is rediective. And so you are building a shielding against redectivity with something that is a bit redctive. After many, many years, if you want to be safe, lead loses its radioactive qualities - makeing roman lead the perfect non radioactive shielding material. Now we strongly believe that

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