The neutrino mass determination from the β spectrum of tritium in valine (ITEP-84)
Boris S. D., Golutvin A. I., Laptin L. P., Lyubimov V. A., Nagovitsyn V. V., Novikov E. G., Nozik V. Z., Soloshchenko V. A., Tikhomirov I. N., Tret'yakov E. F., Myasoedov N. F.
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.