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... The experiment is at Gran Sasso where they
have a detector consisting of 100 kg of NaI. I'm not sure of the nature
of the signal, but whatever it is, they look for an annual variation.
They claim to see such a variation at the 4 sigma level (which is the
usual minimum for claiming an effect). The trouble is that it takes
about 300 years to identify an annual effect with a precision of one
day
... an apparent
annual effect in the Soudan Mine was explained as radon contamination
chich is seasonal (because of changes in ventilation of the mine).
Regards,
Jack