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Registration Number

0218U003439, 0116U005457 , R & D reports

Title

Study of double beta decay of atomic nuclei to the ground and excited levels of the daughter nuclei.

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Head

Danevich Fedor,

Registration Date

13-02-2018

Organization

Scientific Center "Institute for Nuclear Research" of National Academy of Sciences of Ukraine

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The experiment to search for a double beta decay of the 106Cd nucleus was continued using a scintillation detector with a cadmium tungstate crystal from the enriched isotope 106 (106CdWO4) in coincidence / anticoincidence with large-volume cadmium tungstate scintillation detectors. Monte Carlo simulation has been performed for the response of the detector to the processes of 2beta decay of the 106Cd nucleus and the background component, preliminary analysis of the data has been done. The search for a quadruple beta decay of the 150Nd nucleus was performed for the first time, using data obtained with the NEMO-3 detector, at the sensitivity level T1/2 > (1.1-3.2) x 10^21 years. The half-life of the 116Cd nucleus is measured for two-neutrino double beta decay into the ground state of the daughter nucleus: T1/2 = [2.74 +/- 0.04 (stat.) +/- 0.18 (syst.)] x 10^18 years. Scintillation detectors for measuring energy and time-of-flight of electrons for the SuperNEMO Demonstrator detector for search for 0nu2beta decay of the 82Se nucleus. A Bi-Po set-up is developed for measuring radioactive contaminations in foils for the SuperNEMO Demonstrator detector for search for 0nu2beta decay of the 82Se nucleus; a previously unattainable sensitivity level of ~10 uBq/kg was reached. The SuperNEMO Demonstrator set-up for the search for 0nu2beta decay of the 82Se nucleus in the underground Modan laboratory in France is near completion. Radioactive cryogenic scintillation bolometric detectors with lithium molybdate crystals from the enriched 100Mo isotope for searching for neutrinoless double beta decay of the 100Mo nucleus have been developed and studied for radioactive purity.

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Даневич Федор Анатолiйович
Зарицький Микола Миколайович
Зуєва Олена Володимирівна
Кобичев Владислав Валерійович
Кобичев Роман Владиславович
Кобичева Лариса Миколаївна
Кропив'янський Борис Миколайович
Мокіна Валентина Михайлівна
Ніколайчук Михайло Олександрович
Пода Денис Валентинович
Поліщук Оксана Григорівна
Тимошенко Андрiй Iванович
Третяк Володимир Iллч
Шкурупій Олег Юрійович

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2020-04-02