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Information × Registration Number 0221U100933, 0120U101838 , R & D reports Title Investigation of double beta decay, rare alpha and beta decays popup.stage_title Head Polishchuk Oksana H., Registration Date 11-01-2021 Organization Institute for Nuclear Research of NAS of Ukraine popup.description2 1.An experiment to search the alpha decay of 190Pt to the first excited level of the daughter nucleus 186Os with an energy of 137.2 keV was performed in the underground laboratory HADES (Belgium, 225 m) with the help of two germanium detectors and a sample of platinum (148 g). The value of the partial half-life was obtained: T1/2=[2.15-0.14+0.16 (stat.)±0.37(syst.)]×10^14 years. The accuracy is 1.7 times better in comparison with the result of the previous experiment. 2.The alpha decays of natural isotopes of osmium were searched in the National Laboratory of Gran Sasso (Italy) using a high-purity sample of osmium (118 g). The isotopic composition of the sample was determined with high accuracy, which allowed to reduce the effect of systematic errors on the result. The strictest lower limits on the half-lives for 184,186Os nuclides have been established. The next stage of the experiment was started in order to increase the efficiency of gamma-ray detection. 3.For the first time, an experimental search for alpha decays of natural isotopes of hafnium was performed using a high-purity sample of metallic hafnium (179.8 g) and three semiconductor detectors in the HADES laboratory (Belgium). Lower limits were set for the half-lives relative to the searched decays at the level of (10^15 - 10^18) years. 4.The half-life of 50V relative to the electronic capture with the transition to the first excited level of the daughter nucleus was measured: T1/2=[2.77-0.19+0.20]×10^17 years. A half-life relative to the beta decay on the first excited level of the daughter nucleus was obtained: T1/2≥8.9×10^18 years (with 90% confidence level). 5.An experiment to measure the half-life of 212Po was performed. The statistics have been improved in order to reduce the statistical error of the result. The preliminary value of the half-life T1/2=[295.1±0.3(stat)] ns is obtained. Data processing is in progress in order to clarify the systematic errors of the exp. Product Description popup.authors Kasperovych Dmytro V Romaniuk Mariia V. Sokur Nazar V popup.nrat_date 2021-01-11 Close