Controversial dark-matter claim faces ultimate test

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Within three years, the experiments will be able to either confirm the existence of dark matter — or rule the claim out once and for all, say the physicists who work on them. All will use sodium iodide crystals to detect dark matter, which no full-scale experiment apart from DAMA’s has done previously. “But how to interpret that signal — whether it’s from dark matter or something else — is not clear.” No other full-scale experiment has used sodium iodide in its detector, although the Korea Invisible Mass Search (KIMS), in South Korea, used caesium iodide. The KIMS and DM-Ice teams have built a sodium iodide detector together at Yangyang Underground Laboratory, 160 kilometres east of Seoul. Together, KIMS/DM-Ice and ANAIS will have about 200 kilograms of sodium iodide, and they will pool their data.

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