From en.wikipedia.org:
[Experiment searching for dark matter] The COGENT experiment has searched for
dark matter. It uses a single germanium crystal (~100 grams<ref
name=Cartlidge2014/>) as a cryogenic detector for WIMP particles. CoGeNT has
operated in the Soudan Underground Laboratory since 2009.
** Results
Their first announcement was an excess of events recorded after 56 days.<ref
name=NN-2010-02-26/> 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".<ref
name=NN-2010-02-26>[url=http://www.nature.com/news/2010/100226/full/news.2010.97.html][1]
This signal conflicts with other searches that have failed to find any
evidence, such as XENON and LUX but appears to confirm results from DAMA.
They observed an annual modulation in the event rate that could indicate light
dark matter.<ref name=Dacey2011>[last1=James Dacey ]
The annual modulation has continued to be seen in 3 years of data.<ref
name=Cartlidge2014>[last1=Edwin Cartlidge]
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.[2] 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.[3][4]
** References
[reflist]
** External links
- CoGeNT Dark Matter Experiment website (see https://web.archive.org/web/20150905095412/http://cogent.pnnl.gov/)
[Dark matter]
Category:Experiments for dark matter search