
Hunt for dark matter steps up as tank goes down under Lead
Last week, a xenon tank measuring about 5 feet wide and 5 feet tall rode an elevator 4,850 feet below ground to the cavern that will house the experiment in the former Homestake gold mine, now called the Sanford Underground Research Facility.Filling the tank with 10 metric tons of liquid xenon is one of the last major tasks to complete before the five-year experiment, named LUX-Zeplin or "LZ" for short, begins next year (“LUX” is an acronym for “large underground xenon” and “Zeplin” is a mercifu...