Scientists search for dark matter in the depths of an abandoned gold mine

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Scientists search for dark matter in the depths of an abandoned gold mine
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Researchers want to lure a hypothesized particle from outer space to the Sanford Underground Research Facility, housed in a former gold mine in South Dakota.

In a South Dakota gold mine, a research team is hunting for a yet-undiscovered particle that could explain dark matter.An interdisciplinary team of researchers is working to lure a hypothesized particle from outer space to the Sanford Underground Research Facility, housed in a former gold mine that operated at the height of the 1870s gold rush in the town of Lead, South Dakota.

Anwar Bhatti, a research professor at the University of Maryland, said there are pros and cons to both approaches. can only be conducted underground because researchers need to eliminate surface-level cosmic radiation, which can muddle dark matter signals and make them easier to miss. The UMD research group calibrates the instrument that powers the LZ experiment, which involves preparing and injecting tritium—a radioactive form of hydrogen—into a liquefied form of xenon, an extremely dense gas. Once mixed, the radioactive mixture is pumped throughout the instrument, which is where particle collisions can be observed.

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