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Registration Number

0215U001178, 0111U010000 , R & D reports

Title

Rare nucklear events and decays induced by weak interactions, the decay spectroscopy and nuclear structure

Head

Fedorets Ivan Dmytrovich,

Registration Date

30-01-2015

Organization

Kharkov National University named after V.N. Karazin

Description

Results from searches of double K-capture in 78Kr in an experiment with the large-volume copper proportional counter, using data samples corresponding of two independent series of measurements with different intrinsic radioactivity background are presented. The statistical significance of combined data from two stages of operation equals 2,5?. Found for the first time as events that at 2,2? assigned to 2?(2?) decay of 136Xe. Corresponding to such effects, the half-live of 78Kr and 136Xe were obtained. Half-life limits for other 2K transitions to the excited states in 78Se have been defined also. The ways of improvements of the experiment to search for 2K capture in 124Хe are proposed. The new method and results of an experimental test of the time stability of the half-life of alpha-decay 214Po nuclei are presented. Two underground installations aimed at monitoring the time stability have been constructed. It was found the amplitude of a possible annual variation of 214Po half-life does not exceed 0,33% (90% C.L.) of the mean value. The energies, spectroscopic factors, magnetic dipole and electric quadruple moments of the ground and excited states, as well as reduced probabilities of electromagnetic transitions between them and reduced probabilities of beta-transitions for odd nuclei with 31?A?231 have been calculated in the frame of dynamic collective model. Results of the calculations are in a good agreement with experimental data.

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Заславський О.
Корчин О.
Луцай Н.
Митрошин В.
Раткевич С.
Савчук Л.
Федорець І.
Шульга М.
Щусь О.