The Deep Underground Neutrino Experiment (Dune) is commencing construction in the decommissioned Homestake mine near Lead, South Dakota. Engineers will assemble four enormous detector units within underground caverns located approximately one mile beneath the surface. The facility will leverage the mine’s existing infrastructure, which was converted into the Sanford Underground Research Facility following the mine’s closure in 2001.
The detector apparatus represents a significant engineering undertaking, comprising over 4,000 tonnes of steel and designed to hold approximately 70,000 tonnes of liquid argon maintained at temperatures around -200 degrees Celsius. Assembly is expected to require nearly three years, with an additional year needed to fill the detectors with the liquid argon coolant. The project represents an international collaboration, with the United Kingdom serving as the largest international partner and contributing core detector components, computing systems, and equipment to generate neutrino beams.
Once operational, Dune will detect neutrinos traveling through 800 miles of Earth’s crust from the Fermilab particle physics facility near Chicago. The experiment will also monitor neutrinos arriving naturally from space, including those originating from stellar explosions and black hole formation events. Researchers aim to address fundamental questions about neutrino properties, including their relative masses and potential differences between neutrinos and their antimatter counterparts, which could provide insight into why the universe contains matter rather than antimatter.
Neutrinos represent one of the universe’s most abundant particle types, yet remain poorly understood. These chargeless particles possess minimal interaction with ordinary matter, with approximately one trillion passing through human bodies each second undetected. The experiment continues a tradition established in the 1960s when physicist Ray Davis detected solar neutrinos using a chlorine-based detector in the same mine, marking the first such observation. Local officials have expressed enthusiasm about the project’s potential to bring economic opportunities and scientific advancement to the region.
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