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Information × Registration Number 0120U104845, ( 0220U104351  ) R & D request Title Double beta decay of atomic nuclei Head Danevich Fedir A., д.ф.-м.н. Registration Date 12-11-2020 Organization Institute of Nuclear Research of the National Academy of Sciences of Ukraine popup.description1 The aim of the project is a search for the processes of double beta decay of 100Mo, 106Cd, 116Cd, 184Os, 190Pt nuclei at a new level of sensitivity, accurate measurement of the two-neutrino decay mode of 100Mo, 116Cd, 150Nd, and obtaining competitive estimates of Majorana neutrino mass, parameters of right-handed currents in weak interaction, neutrino interaction constants with majorons and some other parameters of models – extensions of the Standard Model of elementary particles. The abovementioned nuclides are among the most promising in terms of the probability of decay and the possibility of resonant neutrinoless double electron absorption. In addition to setting new neutrino mass limits on the level of 0.2-0.3 eV, the experiment with 100Mo will show the possibility of using low-temperature scintillation bolometric detectors in large-scale projects CUPID and AMoRE II with a sensitivity that will test the inverted neutrino mass state scheme. The aim of the project is also a search for double beta processes in the 106Cd nuclide and, possibly, the first observation of the two-neutrino electron capture with positron emission, as well as an estimation of the value of the axial-vector constant qA, for which the shape of the 113Cd beta spectrum should be measured with great accuracy and the decay scheme of 50V should be studied. The search for neutrinoless double electron capture should be performed in 106Cd, 186Os, and 190Pt nuclei, which have the possibility of a resonant transition (which should significantly increase the probability of decay and make it possible to estimate the neutrino mass and other parameters of the theory). An important additional goal of the project is development of experimental methods of low-background nuclear spectrometry for future, more sensitive studies. popup.nrat_date 2024-12-10 Close