Fig. 5

Coincidence energy spectra as predicted by the analytical calculations for two detectors with d = 2.5 cm. The different distributions in color are the resulting β⁻ energy spectrum shifted and normalized to the corresponding energy value for each possible interaction combination. The black line is the resulting energy spectrum from summing the β⁻ distributions from the source crystal and the γ-rays from the isomeric transition interactions in the detector crystal. The energy value of the peaks arising from the detection of one, two, or three γ-rays are indicated in the figure (see text for details)