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VOLUME 42 (1985) | ISSUE 3 | PAGE 107
The neutrino mass determination from the β spectrum of tritium in valine (ITEP-84)
The spectrum of the β decay of tritium in a valine molecule is studied with use of an upgraded ITEP spectrometer. Considerable attention is given to the analysis of the instrumental functions. The neutrino mass and the end-point energy are estimated: the neutrino mass is > 20 eV, the mass difference between 3H and 3He, which can be found from the end-point energy of the spectrum, is in good agreement with the highly accurate data on mass-spectroscopy based on ion-cyclotron resonance.