The CoGeNT experiment has searched for dark matter. It uses a single germanium crystal as a cryogenic detector for WIMP particles. CoGeNT has operated in the Soudan Underground Laboratory since 2009.

Their first announcement was an excess of events recorded after 56 days[1] They observed an annual modulation in the event rate that could indicate light dark matter.[2] This signal conflicts with other searches that have failed to find any evidence, such as XENON and LUX. The annual modulation has continued to be seen in 3 years of data.[3]

"A CoGeNT result in the hunt for dark matter". Nature News. 26 February 2010. Retrieved 5 May 2015.
James Dacey. "CoGeNT findings support dark-matter halo theory". physicsworld. Retrieved 5 May 2015.
Edwin Cartlidge (Jan 20, 2014). "CoGeNT gives further backing to annual dark-matter variation".

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