arXiv subjects

K. Shakhov

Publications and source records attributed to K. Shakhov.

4 recordsLinked to original sources

arXiv2026

First investigation of $^{96}$Zr samples enriched by the gas-centrifuge method for the use in rare-decay studies

For the first time, the isotope $^{96}$Zr has been produced by the gas-centrifuge method (enrichment is 88.28% and full mass of $^{96}$Zr is 179.816 g). The level of radionuclide impurities of the samples and thus their suitability for rare-event search have been investigated using three low-background HPGe detectors. The most stringent limit, obtained at sea level, on the half-life of the double beta decay of $^{96}$Zr to the $0^+_1$ excited state (1148 keV) of $^{96}$Mo has been set $T_{1/2}(0\nu+2\nu)>3.9 \times 10^{19}$ yr (90% C.L.).

nucl-ex↗

arXiv2025

New constraints on coherent elastic neutrino-nucleus scattering by the nuGeN experiment

The nuGeN experiment searches for coherent elastic neutrino-nucleus scattering (CEvNS) at the Kalinin Nuclear Power Plant. A 1.41-kg high-purity low-threshold germanium detector surrounded by active and passive shielding is deployed at the minimal distance of 11.1 m allowed by the lifting mechanism from the center of reactor core, utilizing one of the highest antineutrino fluxes among the competing experiments. The direct comparison of the count rates obtained during reactor-ON and reactor-OFF periods with the energy threshold of 0.29~keV$_{ee}$ shows no statistically significant difference. New upper limits on the number of CEvNS events are evaluated on the basis of the residual ON$-$OFF count rate spectrum.

hep-ex↗

arXiv2022

First results of the nuGeN experiment on coherent elastic neutrino-nucleus scattering

The nuGeN experiment is aimed to investigate neutrino properties using antineutrinos from the reactor of the Kalinin Nuclear Power Plant. The experimental setup is located at about 11 meters from the center of the 3.1 GWth reactor core. Scattering of the antineutrinos from the reactor is detected with low energy threshold high purity germanium detector. Passive and active shieldings are used to suppress all kinds of backgrounds coming from surrounding materials and cosmic radiation. The description of the experimental setup together with the first results is presented. The data taken in regimes with reactor ON (94.50 days) and reactor OFF (47.09 days) have been compared. No significant difference between spectra of two data sets is observed, i.e. no positive signals for coherent elastic neutrino-nucleus scattering are detected. Under Standard Model assumptions about coherent neutrino scattering an upper limit on a quenching parameter k < 0.26 (90 \% C.L.) in germanium has been set.

nucl-ex↗

arXiv2021

NaI(Tl+Li) scintillator as multirange energies neutron detector

Novel NaIL detector (5x6 inch) was investigated for aims of neutron detection in wide energy range. It has been found that the detector together with its known ability to detect the γ- radiation is also allows to distinguish neutron signals in three quasi-independent ways. It sensitive to neutron fluxes on a level down to $10^{-3}$ $cm^{-2}$ $s^{-1}$. In the work intrinsic α- background and neutron detection efficiency for the NaIL detector were obtained. Experimental data was compared with results of Geant4 Monte Carlo (MC).

physics.ins-det↗