Noble gas with special features used in experiments for direct detection of dark matter. Needs to be pure.
Xenon is an element which can be easily kept in the liquid state, becoming an excellent scintillator, meaning it emits light if a particles interacts with it. It is heavy and dense, which increases the probability of interaction with dark matter. It absorbs very well the radiations from outside and its intrinsic radioactivity, already very low, can be reduced at minimum through further purification.
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