Fig. 3

Simulated geometry of configurations (FastN) (a), (ThermN) (b) with the polyethylene brick and (BackgN) (c) with the polyethylene brick and the alternate lead and borated polyethylene slabs in black and dark blue respectively. The detector appears in gray. The wireframe volume acts as the neutron shielding used in the experimental set-up. The yellow window lets the neutrons into the detector active area. Generated neutrons are depicted in green