TheCoGeNT experiment has searched fordark matter. It uses a singlegermanium crystal (~100 grams[1]) as acryogenic detector forWIMP particles. CoGeNT has operated in theSoudan Underground Laboratory since 2009.
Their first announcement was an excess of events recorded after 56 days.[2] Juan Collar, who presented the results to a conference at the University of California, was quoted: "If it's real, we're looking at a very beautiful dark-matter signal".[2][3]
This signal conflicts with other searches that have failed to find any evidence, such asXENON andLUX but appears to confirm results fromDAMA.
They observed an annual modulation in the event rate that could indicate light dark matter.[4]
The annual modulation has continued to be seen in 3 years of data.[1]
However more recent work has shown that the excess of events attributed to a tentative dark matter signal was in fact due to an underestimated background from surface events.[5] After accounting for this background there is no evidence for a signal in data from the CoGeNT experiment and no tension with null results from other experiments.[6][7]
| Forms of dark matter |  | ||||||
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| Search experiments |
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| Potentialdark galaxies | |||||||
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