3-GeV Protons on Pb Neutrons Streaming through a Labyrinth

Measurements were made of neutron fluxes along a labyrinth with four bends using activation detectors. The neutrons were created by a 3-GeV proton beam striking an eight-inch thick Pb target located either upstream, opposite, or downstream from the first leg of the labyrinth. Results of the activities and flux measurements are given, normalized to 1010 protons/second.