Fig. 7
From: Fast decay of 23S1 positronium atoms in an MgO lined cavity
Lifetime spectra for \(2\,^{3}\mathrm {S}_{1}\) atoms obtained from smoothed quenching data using detectors D1-3, as explained in the text. The solid curves are exponential fits to the data. The grey bands represent the region in which data are not used in the fit since it takes 200 ns until all atoms have entered the waveguide