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MAJORANA Demonstrator

The Majorana Demonstrator experiment could help us understand the imbalance of matter and antimatter in the universe—and tell us why we exist at all.
A researcher works on a cryostat inside a glovebox.

The Majorana Demonstrator experiment, located on the 4850 Level,  uses 40 kilograms of pure germanium crystals enclosed in deep-freeze cryostat modules—protected by lead shielding in a laboratory nearly a mile underground—to answer one of the most challenging and important questions in physics: are neutrinos their own antiparticles? If the answer is yes, it will require rewriting the Standard Model of Particles and Interactions, our basic understanding of the physical world.

The Majorana Demonstrator Collaboration is comprised of more than 100 researchers from 19 institutions in the United States, Canada, Russia, and Japan. Their efforts are focused on the experiment now under construction at the Davis Campus of the Sanford Underground Research Facility in Lead, South Dakota. To discover whether neutrinos can be their own antiparticles, Majorana scientists will look for one of the rarest forms of radioactive decay: neutrinoless double-beta decay.