Searching for dark matter, deep in the Earth

Deep in an active nickel mine near Sudbury, Ontario, researchers are installing and calibrating a set of sensitive detectors. They hope that the location roughly 6,800 feet underground will screen out much of the ordinary radiation and cosmic rays felt on the surface, and allow their detectors to sense tiny disturbances caused by a dark matter particle passing close to the nucleus of one of the germanium atoms in a target material.

If successful, the SuperCDMS SNOLAB experiment may shed some light on the nature of dark matter, an unseen something that is thought to make up around 85% of the matter in the universe.

Priscilla Cushman, a physicist who has been working on the project for over 20 years, joins Host Flora Lichtman to describe the hunt, the timeline of the experiment, and the big unknowns facing the SuperCDMS team. 

Guest: 

Dr. Priscilla Cushman is spokesperson for the SuperCDMS SNOLAB experiment, and a professor in the School of Physics and Astronomy at the University of Minnesota.

Other episodes you may enjoy:

• Listening for the cosmic ‘dark ages,’ from the lunar far side
• Most Powerful Neutrino Ever Is Detected In the Mediterranean

Transcripts for each episode are available within 1-3 days at sciencefriday.com.

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