ACCOUNT FOR THE MOLECULAR-STRUCTURE IN BETA-DECAY AND THE PROBLEM OF THE NEUTRINO REST MASS

All beta sources used for detection of the neutrino rest mass have a m olecular structure. The energy of the chemical bonding and electronic excitations is more or much more than the probable rest mass of the el ectron neutrino. That is why the experimental data cannot be handled w ithout taking into account an electronic structure of the beta source. An analysis is given for the effect of the molecular structure on the beta spectrum and all necessary formula are presented. The possible r ole of the final states in the 17 keV neutrino measurements is also di scussed.