EAST LANSING, Mich. (AP) — The construction of a new national facility for nuclear science at Michigan State University is continuing with the addition of 140 truckloads of concrete.

About 1,400 cubic yards of concrete was being poured Wednesday for a portion of a tunnel floor in what will be the school’s Facility for Rare Isotope Beams, The Lansing State Journal (http://on.lsj.com/1mCmPBN ) reported. The tunnel will hold the facility’s superconducting linear accelerator, which will produce beams of subatomic particles traveling at half the speed of light.