Soudan Underground Laboratory
The Soudan Underground Laboratory is an underground research laboratory for elementary particle physics in the former Soudan Mine in Minnesota, now operated as the Soudan Underground Mine State Park .
In the 1980s, scientists from the University of Minnesota began building an underground research facility in the Soudan Mine, because the rock layers above absorb cosmic rays effectively and sensitive physical experiments are no longer disrupted by them.
The Soudan-1 experiment to search for proton decays and its successor Soudan-2 were originally carried out in the mine . The university and the Department of Natural Resources have since expanded the laboratory to carry out other physical experiments, such as the currently active MINOS neutrino detector for studying neutrino oscillations and CDMS-II, an experiment to search for massive dark matter ( WIMPs ). Parts of the research facilities can be visited and once a year there is an open day at which employees of the research facility answer visitors' questions.
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Coordinates: 47 ° 49 ′ 29 " N , 92 ° 15 ′ 23" W.