Half a mile-deep lab is shielded with 100 tons of steel.
A gold mine located over half a mile underground in Victoria, Australia, has been converted into the Stawell Underground Physics Laboratory to study dark matter, aScientists believe that dark matter, the invisible substance largely unknown to mankind, makes up 85 percent of our universe's mass. To know more about it, scientists have been building dark matter detectors, and one of the "As with all things in science, one does not just stop with one data record.
Immersed inside the liquid scintillator are ultra-pure sodium iodide crystals, which are instrumental in detecting dark matter interactions. To make this detection possible, photomultiplier tubes — instruments that can even detect a single photon of light, have been coupled to the sodium iodide crystals as well as scintillator liquid.
Researchers know that dark matter interactions with normal matter are rare. So, any detection of light that happens in both the crystals and the scintillator liquid will be rejected. Additionally, the scintillation liquid will also act as an active veto as it eliminates background radiation, the press release said. This is a major improvement over SABRE's predecessor DAMA/LIBRA lab in Italy, which is also tasked with detecting dark matter.
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