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Ju. M. Gavriljuk

Publications and source records attributed to Ju. M. Gavriljuk.

8 recordsLinked to original sources
arXiv2012

Working characteristics of the New Low-Background Laboratory (DULB-4900, Baksan Neutrino Observatory)

A concise technical characteristic of a new low-background laboratory DULB-4900 of the BNO INR RAS is presented. The technique and the results of background measurements in the Hall, ordinary box and low-background box are presented. Rn-222 contamination in the laboratory air has been measured by direct detection of gamma-radiation of its daughter Bi-214 distributed over the volume of the low-background box. The results of the data analysis are presented.

physics.ins-det↗
arXiv2011

Results of a search for 2β-decay of Xe-136 with high pressure copper proportional counters in Baksan Neutrino Observatory INR RAS

Search for ββ-decay of Xe-136 with two high pressure proportional counters is carried out in Baksan Neutrino Observatory. The experiment is based on comparision of spectra measured with natural and enriched xenon. The measured halfe life is equal to T_{1/2}=5.5^{+4.6}_{-1.7} \cdot 10^{21} yr (67% C.L.) for ββ2ν-decay mode. No evidence has been found for neutrinoless ββ-decay. The decay half life limit based on data measured during 17280 h is T_{1/2}(ββ0ν)\geq 4.9 \cdot 10^{23} yr (90% C.L.).

nucl-ex↗
arXiv2011

Experimental test of the time stability of the half-life of alpha-decay Po-214 nuclei

A method and results of an experimental test of the time stability of the half-life of alpha-decay Po-214 nuclei are presented. Two underground installations aimed at monitoring the time stability have been constructed. Time of measurement exceeds 1038 days for one set up and 562 days for the other. It was found that amplitude of possible annual variation of Po-214 half-life does not exceed 0.2% of the mean value. The limit on the deviation of the decay curve from exponent at 0.034\times T_{1/2}<t< 0.1\times T_{1/2} range has been found.

nucl-ex↗
arXiv2011

Search for 2K(2ν)-capture of Kr-78

Results of a search for Kr-78 double K-capture at the second stage of the experiment with high-pressure copper proportional counters are presented. The method is based on comparison of spectra measured with natural and enriched krypton. The total exposure of the low background measurements is for Kr-78 152 g*yr and for Kr-nat 106 g*yr. An excess of events was observed in the analysis of Kr-78 selected data collected during 2008-2010 years. This excess could correspond to a double K-capture of Kr-78 with the half-life of T_{1/2}(2K,2ν+ 0ν)=[1.4^{+2.2}_{-0.7}]\cdot 10^{22}$ yr (90% C.L.)

nucl-ex↗
arXiv2005

Next stage of search for 2K(2$ν$)-capture of $^{78}$Kr

A technique to search for 2K-capture of $^{78}$Kr with large low-background proportional counter filled with an enriched in $^{78}$Kr up to 99.8% sample of Krypton at a pressure of 4.51 is described in this paper. The results of first measurements are presented. Analysis of data collected during 159 hours yielded new limit to the half-life of $^{78}$Kr with regard to 2K-capture (T$_{1/2}\geq6\cdot10^{21}$ yr (90% C.L.)). Sensitivity of the facility to the process for one year of measurement was evaluated to be $\texttt{S}=1.0\cdot10^{22}$ yr (90% C.L.).

nucl-ex↗
arXiv2005

Results of a search for 2$β$-decay of $^{136}$Xe with high-pressure copper proportional counters in Baksan Neutrino Observatory

The experiment for the 2$β$-decay of $^{136}$Xe search with two high-pressure copper proportional counters has been held in Baksan neutrino observatory. The search for the process is based on comparison of spectra measured with natural and enriched xenon. No evidence has been found for 2$β$(2$ν$)- and 2$β$(0$ν$)-decay. The decay half lifetime limit based on data measured during 8000 h is T$_{1/2}$$\geq8.5\cdot10^{21}$yr for 2$ν$-mode and T$_{1/2}$$\geq3.1\cdot10^{23}$yr for 0$ν$-mode (90%C.L.).

nucl-ex↗
arXiv2002

Characteristics of proportional counter filled with CF$_4$ and Xe additions

In this article the measurement results of proportional counter working characteristics filled with CF$_4$ and Xe ($0\div5$% Xe) additions at different pressures ($0.8\div14.8$ $at$) are presented. We have found that a bit of Xe addition reduces working voltage necessary to get the same gas amplification by two times against pure CF$_4$, it improves as well the resolution of the counter and increases limit gas amplification by more than ten times.

nucl-ex↗