arXiv subjects

V. N. Gavrin

Publications and source records attributed to V. N. Gavrin.

21 records · Page 2Linked to original sources

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↗

arXiv2000

The preliminary results of fast neutron flux measurements in the DULB laboratory at Baksan

One of the main sources of a background in underground physics experiments (such as the investigation of solar neutrino flux, neutrino oscillations, neutrinoless double beta decay, and the search for annual and daily Cold Dark Matter particle flux modulation) are fast neutrons originating from the surrounding rocks. The measurements of fast neutron flux in the new DULB Laboratory situated at a depth of 4900 m w.e. in the Baksan Neutrino Observatory have been performed. The relative neutron shielding properties of several commonly available natural materials were investigated too. The preliminary results obtained with a high-sensitive fast neutron spectrometer at the level of sensitivity of about 10^(-7) neutron/ (cm^2 sec) are presented and discussed.

physics.ins-det↗

arXiv1999

Events registration in a fast neutrons spectrometer

The principle of operation, design, registration system and main characteristics of a fast neutrons spectrometer are described. The spectrometer is intended for direct measurements of ultra low fluxes of fast neutrons. It is sensitive to neutron fluxes of 10^-7 neutrons/(cm^2 s^1) and lower with the neutron energy above 700 keV. The detection efficiency of fast neutrons with simultaneous energy measurement is within 0.02-0.06. The neutron spectrometer was designed taking into account requirements for minimizing the gamma-ray background. It is a calorimeter based on a pure liquid organic scintillator-thermalizer with helium proportional counters as capturers of thermalized neutrons distributed uniformly over the volume. Low-level signal electronics for the spectrometer were designed with signal-to-noise ratio optimization and full pulse shape analysis required for efficient rejection of background events. A data acquisition and processing system is based on fast (100 MHz) two-channel PC/AT interfaced digital oscilloscope. The acquisition software was written in the C programming language.

physics.ins-det↗