Letters

Underground particle hunts
The dark matter experiments described in “Mining for missing matter” (SN: 8/28/10, p. 22) sound almost identical to those looking for neutrinos. Both are placed deep underground to help screen out background radiation, especially neutrons. How do particle hunters differentiate between neutrino hits and those by the putative dark matter particles? Also, the article makes it sound like investigators think there is only one type of [exotic] dark matter particle.