The Use of Low Temperature Detectors for Direct Measurements of the Mass of the Electron Neutrino

Figure 26

Summary of the values measured by several experiments since the early 1980s. The points are grouped by analysis and technique: decay half-life using X-ray spectroscopy [138] or mass spectrometry [139], capture ratios using X-ray spectroscopy [36–38] or calorimetry [40, 41, 131, 134], IBEC end-point [34], and the Penning trap mass spectrometer SHIPTRAP [140] (a). Monte Carlo computed statistical sensitivity as a function of for and with , , and no background. The interval adopted for is the one which was considered as possible until the very recent measurement of the - mass difference (b).

(a)

(b)