Panasenko S. Experimental research of double beta-decay 136Xe

The object of research - the phenomenon of double beta decay 136Xe. Goal - the experimental determination of half-lives of two-neutrino and neutrinoless process of double beta decay of 136Xe with a maximum attainable accuracy. Methods of research - general science, using computer modeling and analysis. Scientific novelty: a study of double beta decay of 136Xe independent experimental method, the sensitivity of registration two-neutrino double beta decay of 136Xe 8,5x10^21 years with 90% confidence level, the lower bound of half-lives of neutrinoless and two-neutrino process of double beta decay 136Xe at the record level of world achievements; held long-term measurements of background alpha-radiation and the level of 222Rn in the air directly in the automatic mode, the unit-level Bq/m3; for measuring ultra-low levels of surface alpha-activity was developed pulsed ion ionization chamber, the technique of compensation influence the electronic properties of the recording channels, which is used in treatment programs and data analysis for the resumption of a registered signal, refinement of energy and particle identification, has demonstrated high efficiency of the method of analysis of waveforms to discriminate against the background of alpha events in a large proportional counter. Theoretical and practical significance of the results is to determine the boundaries for the half-lives of the two modes of double beta decay of 136Xe, are important for the development of theoretical calculations of nuclear matrix elements and nuclear structure. Obtained in the research results can be used in designing new extremely low background experiments to study the properties of neutrinos and rare nuclear phenomena. Designed equipment can be used to determine the radiation purity of the materials, control of air and the environment. Developed data processing methods can be used in experimental researches.