News of the WeekAstrophysics

WIMPs at Last? Or More Wimpy Sightings?

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Science  03 Mar 2000:
Vol. 287, Issue 5458, pp. 1570-1571
DOI: 10.1126/science.287.5458.1570

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Researchers from the Dark Matter experiment at Gran Sasso National Laboratory in Italy reported on 25 February that the number of heavy neutral particles entering their underground detector varies slightly with the seasons. The result, they say, proves that the Milky Way galaxy twirls in the midst of a gigantic cloud of Weakly Interacting Massive Particles (WIMPs), the leading candidate for the "dark matter" thought to account for 90% of the universe's mass. But physicists conducting the Cold Dark Matter Search at Stanford say they see no evidence of the particles.