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Ultrapure copper for an ultrasensitive dark matter detector – Phys.org

In February and March, three batches of copper plates arrived at Fermilab and were rushed into storage 100 meters underground. The copper had been mined in Finland,…

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In February and March, three batches of copper plates arrived at Fermilab and were rushed into storage 100 meters underground. The copper had been mined in Finland, rolled into plates in Germany and shipped across land and sea to the laball within 120 days. In the quest to detect dark matter, the mysterious substance making up 85% of the matter in the universe, every day that the copper spent above ground mattered.
“At the surface of the Earth, we’re in a shower of cosmic rays,” said Fermilab scientist…

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