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Registration Number

0215U007729, 0115U000955 , R & D reports

Title

Investigation of double beta decay

Head

Danevich Fedor,

Registration Date

30-12-2015

Organization

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

Description

The double beta decay of 106Cd is investigated on a new level of sensitivity of T1/2>10^19-10^21 years, including a limit on the 106Cd half-life for the two-neutrino electron capture with positron emission to the ground state of 106Pd has reached the range of the theoretical predictions. Ihe NEMO-3 experiment, new limits has been set on the process of double beta decay of 100Mo nuclei to the ground and excited levels, and the limit of T1/2 > 4.4x10^22 years was reached for neutrinoless double beta decay with the emission of hypothetical particles majorons, which implies a restriction on neutrino-Majoron coupling constant <(1.6-3.0)x10^-5. The restriction of T1/2>1.1x10^24 years for the neutrinoless double beta decay to the ground state results in a limit on the Majorana neutrino mass <0.33-0.62 eV (depending on the calculations of the nuclear matrix elements). An event generator for the simulation of the background and double beta decay of atomic nuclei is complemented by option of generating events for neutrinoless4-beta decay and for 2-beta decay with violation of Lorentz invariance. Development of the next generation SuperNEMO detector was carried out. The detector is aimed to search for neutrinoless double beta decay of 82Se (and possibly, 48Ca and 150Nd) at the level of sensitivity corresponding to the neutrino mass of 0.04 eV-0.1 eV.

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Бойко Роман Сергійович
Даневич Федор Анатолiйович
Зуєва Олена Володимирівна
Кобичев Владислав Валерійович
Кобичева Лариса Миколаївна
Мокіна Валентина Михайлівна
Пода Денис Валентинович
Поліщук Оксана Григорівна
Третяк Володимир Iллч
Черняк Дмитро Миколайович