Underground detectors cooled to near absolute zero to hunt dark matter

Researchers at the University of Minnesota Twin Cities have achieved a major milestone in the search for dark matter by cooling the Super Cryogenic Dark Matter Search (SuperCDMS) experiment to temperatures just thousandths of a degree above absolute zero. Located 6,800 feet underground at SNOLAB in Canada, the experiment uses ultra-pure silicon and germanium crystal detectors operating at tens of millikelvin, hundreds of times colder than outer space. These extremely low temperatures minimize thermal noise, enabling the detectors to measure the faint energy deposits caused by elusive dark matter particles, specifically Weakly Interacting Massive Particles (WIMPs), which are believed to make up about 85% of the universe’s matter but have never been directly detected. The underground location and a sophisticated shielding system made of ultra-pure lead and high-density polyethylene protect the detectors from cosmic rays and background radiation, enhancing the experiment’s sensitivity. Advanced data analysis techniques and new reconstruction algorithms have been developed to distinguish rare dark matter signals from noise