A5058474066- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Water Resources and Management
- Radio Astronomy Observations and Technology
- High-Energy Particle Collisions Research
- Geological Studies and Exploration
- Aquatic and Environmental Studies
- Atomic and Subatomic Physics Research
- Geotechnical and Geomechanical Engineering
- Climate variability and models
- Photocathodes and Microchannel Plates
- Quantum Chromodynamics and Particle Interactions
- Hydrology and Watershed Management Studies
- Medical Imaging Techniques and Applications
- Arctic and Antarctic ice dynamics
Institute for Nuclear Research
2016-2024
Lomonosov Moscow State University
2016-2024
The Baksan Experiment on Sterile Transitions (BEST) was designed to investigate the deficit of electron neutrinos ν_{e} observed in previous gallium-based radiochemical measurements with high-intensity neutrino sources, commonly referred as "gallium anomaly," which could be interpreted evidence for oscillations between and sterile (ν_{s}) states. A 3.414-MCi ^{51}Cr source placed at center two nested Ga volumes were made production ^{71}Ge through charged current reaction,...
First results from the BEST Collaboration searching for short-baseline neutrino oscillations to sterile neutrinos with a high-intensity ${}^{51}$Cr monoenergetic source reaffirm that so-called gallium anomaly, deficit in electron neutrinos, persists. $4\ensuremath{\sigma}$ deficits were observed ${}^{71}$Ge production rates at two different distance scales, which could be interpreted as between an and hypothetical neutrino. The are consistent mass squared difference above about 0.5...
Recently, the Baksan Experiment on Sterile Transitions (BEST) has presented results [1] confirming gallium anomaly---a lack of electron neutrinos ${\ensuremath{\nu}}_{e}$ at calibrations SAGE [2,3] and GALLEX [4]---at statistical significance exceeding $5\ensuremath{\sigma}$. This result is consistent with explanation anomaly as neutrino oscillations into a sterile neutrino, ${\ensuremath{\nu}}_{s}$. Within this explanation, BEST experiment itself provides strongest evidence for among all...
Dark matter sterile neutrinos radiatively decay in the Milky Way, which can be tested with searches for almost monochromatic photons x-ray cosmic spectrum. We analyse data of SRG/ART-XC telescope operated two years all-sky survey mode. With no significant hints Galactic diffuse spectrum we explore models neutrino masses 12--40 keV range and exclude corresponding regions sterile-active mixing.
$\mathcal{O}(1)\mathrm{eV}$ sterile neutrino can be responsible for a number of anomalous results oscillation experiments. This hypothesis may tested at short base line experiments, several which are either ongoing or under construction. Here, we concentrate on the so-called gallium anomaly, found by SAGE and GALLEX its foreseeable future tests with BEST experiment Baksan Neutrino Observatory. We start revision neutrino-gallium cross section that is performed utilizing recent measurements...
Numerous anomalous results in neutrino oscillation experiments can be attributed to the interference of an $\ensuremath{\sim}1\text{ }\text{ }\mathrm{eV}$ sterile neutrino. The Baksan Experiment on Sterile Transitions (BEST), specially designed fully explore Gallium anomaly, starts next year. We investigate sensitivity BEST search a mixed with electron Then, performing combined analysis all (SAGE, GALLEX, BEST), we find region model parameter space (sterile mass and mixing angle) which will...
Baksan Experiment on Sterile Neutrino (BEST) [Gavrin et al., arXiv:1006.2103; Gavrin al.Phys. Part. Nucl. 46, 131 (2015); Rev. D 93, 073002 (2016)] is presently at the stage of production artificial neutrino source $^{51}\mathrm{Cr}$, and gallium exposure will start in July proceed for three months. While aiming specifically investigating anomaly (SAGE GALLEX experiments) [Abdurashitov Phys. C 59, 2246 (1999); Abdurashitov C73, 045805 (2006); Kaether Lett. B 685, 47 (2010)], BEST can do...
We investigate the prospects of SRG mission in searches for keV-scale mass sterile neutrino dark matter radiatively decaying into active and photon. The ongoing all-sky X-ray survey space observatory with data acquired by ART-XC eROSITA telescopes can provide a possibility to fully explore resonant production mechanism neutrino, which exploits lepton asymmetry primordial plasma consistent cosmological limits from Big Bang Nucleosynthesis. In particular, it is shown that at end four year...
Using tremendous photon statistics gained with the stray light aperture of NuSTAR telescope over 11 years operation, we set strong limits on emission close to monochromatic photons from radiative decays putative dark matter sterile neutrinos in Milky Way. In energy range 3-20 keV covered by NuSTAR, obtained reach edge theoretical predictions realistic models leaving only a small room left explore.
Using tremendous photon statistics gained with the stray light aperture of NuSTAR telescope over 11 years operation, we set strong limits on emission close to monochromatic photons from radiative decays putative dark matter sterile neutrinos in Milky Way. In energy range 3-20 keV covered by NuSTAR, obtained reach bottom edge theoretical predictions realistic models where are produced early Universe. Only a small region is left explore, if form entire component.
Abstract We provide a correlation analysis of signatures associated with traces the dark matter decay and galaxy spatial distribution according to 2MRS catalog galaxies. Signature data plays an important role in context current future observations cosmological constraints. Attention is paid constraints that can be obtained for decaying sterile neutrinos when analyzing Spectr-Roentegn-Gamma (SRG) mission. study spectra galaxies, which both eROSITA telescope first time ART-XC telescope. The...
Dark matter sterile neutrinos radiatively decaying in the Milky Way, which can be tested with searches for almost monochromatic photons X-ray cosmic spectrum. We analyse data of SRG/ART-XC telescope operated two years all-sky survey mode. With no significant hints Galactic diffuse spectrum we explore models neutrino masses 12-40 keV range and exclude corresponding regions sterile-active mixing. also discuss limits that obtained framework correlation analysis from SRG mission.
In this paper we present new constraints on velocity-independent cross section of keV-scale mass annihilating Dark Matter particles obtained with SRG/ART-XC after 4 full-sky surveys. These are derived from observations the Milky Way Halo, 33 Local Group spheroidal dwarf (dSph) galaxies and separately for dSph galaxy Ursa Major III/UNIONS 1. The Halo strongest among others all available in literature class models particle masses to 15 keV.
We develop a "hybrid" model of the proton inelastic structure functions applicable in wide region invariant mass produced states $W$ and momentum transfer $Q$ including deep scattering (DIS), nucleon resonance production as well close to threshold. DIS is described terms parton distributions together with higher-twist corrections from an available global QCD fit. The resonant part addressed Breit-Wiegner contributions five $\Delta(1232)$ resonance, $N(1440)$ Roper three effective resonances...
Dark matter sterile neutrinos radiatively decay in the Milky Way, which can be tested with searches for almost monochromatic photons X-ray cosmic spectrum. We analyse data of SRG/ART-XC telescope operated two years all-sky survey mode. With no significant hints Galactic diffuse spectrum we explore models neutrino masses 12-40 keV range and exclude corresponding regions sterile-active mixing.
We provide a correlation analysis of signatures associated with traces the dark matter decay and galaxy spatial distribution according to 2MRS catalog galaxies. Signature data plays an important role in context current future observations cosmological constraints. Attention is paid constraints that can be obtained for decaying sterile neutrinos when analyzing Spectr-Roentegn-Gamma (SRG) mission. study spectra galaxies, which both eROSITA telescope first time ART-XC telescope. The carried out...