Thermal neutrons (| v | = 2.2 km/s) from the ESS are shot horizontally from the neutron source and into the center of a so-called jet tube, which is empty. The tube is round, horizontal and 200 meters long, as outlined in the figure. What diameter d must the radiation tube have for the neutrons to just pass through the tube without hitting the bottom? neutroner, v2.2 km/s Diameter, d Lngde 200 meter