Review Article
The Use of Low Temperature Detectors for Direct Measurements of the Mass of the Electron Neutrino
Figure 7
These plots compare the effect of a final excited state ( and ) on the beta spectrum as measured with a calorimeter (blue) and with a spectrometer (red) and the effect of (green). The fractional spectrum deviation is the quantity , where and are, respectively, the observed beta spectra with and without excited final state.