Fig. 2From: Fast decay of 23S1 positronium atoms in an MgO lined cavitySchematic positions of the three γ-ray detectors relative to the waveguide structure (not to scale). D1 and D2 were symmetrically placed near the Ps production region, and D3 was located further away, with a field of view covering the entire waveguide region. All dimensions are in mmBack to article page