V. N. Duginov
A5043947917- Muon and positron interactions and applications
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Advanced Condensed Matter Physics
- Particle accelerators and beam dynamics
- Particle physics theoretical and experimental studies
- Rare-earth and actinide compounds
- Advanced NMR Techniques and Applications
- Particle Detector Development and Performance
- Magnetic and transport properties of perovskites and related materials
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Iron-based superconductors research
- Magnetic Properties of Alloys
- Superconductivity in MgB2 and Alloys
- Inorganic Fluorides and Related Compounds
- Atomic and Subatomic Physics Research
- Graphene research and applications
- Solid-state spectroscopy and crystallography
- Quantum and electron transport phenomena
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Plasma Diagnostics and Applications
- Magnetic properties of thin films
- Crystallography and Radiation Phenomena
Dubna State University
2007-2024
Joint Institute for Nuclear Research
2011-2023
Research Institute of Radio
2007
Institute for Nuclear Research
1991-1994
Kurchatov Institute
1990-1991
Energy Institute
1990-1991
ETH Zurich
1991
We present the first results of Fermilab Muon g-2 Experiment for positive muon magnetic anomaly $a_\mu \equiv (g_\mu-2)/2$. The is determined from precision measurements two angular frequencies. Intensity variation high-energy positrons decays directly encodes difference frequency $\omega_a$ between spin-precession and cyclotron frequencies polarized muons in a storage ring. ring field measured using nuclear resonance probes calibrated terms equivalent proton spin precession...
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
The Muon g-2 Experiment at Fermi National Accelerator Laboratory (FNAL) has measured the muon anomalous precession frequency $ω_a$ to an uncertainty of 434 parts per billion (ppb), statistical, and 56 ppb, systematic, with data collected in four storage ring configurations during its first physics run 2018. When combined a precision measurement magnetic field experiment's ring, determines anomaly $a_μ({\rm FNAL}) = 116\,592\,040(54) \times 10^{-11}$ (0.46 ppm). This article describes...
The Fermi National Accelerator Laboratory has measured the anomalous precession frequency $a^{}_\mu = (g^{}_\mu-2)/2$ of muon to a combined precision 0.46 parts per million with data collected during its first physics run in 2018. This paper documents measurement magnetic field storage ring. is monitored by nuclear resonance systems and calibrated terms equivalent proton spin spherical water sample at 34.7$^\circ$C. weighted distribution resulting $\tilde{\omega}'^{}_p$, denominator ratio...
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
The Technical Design for the COMET Phase-I experiment is presented in this paper. an at J-PARC, Japan, which will search neutrinoless conversion of muons into electrons field aluminium nucleus ($\mu-e$ conversion, $\mu^- N \to e^- N$); a lepton flavor violating process. experimental sensitivity goal process $3.1\times10^{-15}$, or 90 % upper limit branching ratio $7\times 10^{-15}$, factor 100 improvement over existing limit. expected number background events 0.032. To achieve target and...
We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, $\tilde{\omega}'^{}_p$, anomalous precession frequency corrected for beam dynamics effects,...
Results on the systematics of magnetic penetration depth ${\ensuremath{\lambda}}_{\mathit{a}\mathit{b}}$ in high-temperature superconductors ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{Ca}}_{1\mathrm{\ensuremath{-}}\mathit{z}}$${\mathrm{Y}}_{\mathit{z}}$${\mathrm{Cu}}_{2}$${\mathrm{O}}_{8+\mathrm{\ensuremath{\delta}}}$ (z=0,0.1,0.2,0.3,0.4,0.45) and...
The anomalous magnetic moment of the muon is one most precisely measured quantities in experimental particle physics. Its latest measurement at Brookhaven National Laboratory deviates from Standard Model expectation by approximately 3.5 standard deviations. goal new experiment, E989, now under construction Fermilab, a fourfold improvement precision. Here, we discuss details future and its current status.
This paper presents the beam dynamics systematic corrections and their uncertainties for Run-1 data set of Fermilab Muon g-2 Experiment. Two to measured muon precession frequency $\omega_a^m$ are associated with well-known effects owing use electrostatic quadrupole (ESQ) vertical focusing in storage ring. An average vertically oriented motional magnetic field is felt by relativistic muons passing transversely through radial electric components created ESQ system. The correction depends on...
The residual polarization of negative muons has been studied for phosphorus-doped and antimony-doped silicon crystals. measurements were carried out in a transverse magnetic field 0.1 T over the temperature region 4 K-300 K. ionized neutral states pseudo-acceptor observed first time. rate transition from to state acceptor was found be equal range K-12 estimated rates relaxation moment acceptor-centre electron shell are at K 15 respectively. experimental results obtained interpreted terms...
The phase separation (PS) effect in superconducting ${\mathrm{La}}_{2}{\mathrm{CuO}}_{4+x} (x<~0.04)$ single crystals with low oxygen mobility was studied via $\ensuremath{\mu}\mathrm{SR}$ spectroscopy, high-resolution neutron diffraction, and magnetic susceptibility. Despite the fact that all are inside miscibility gap $(0.01<x<0.06),$ only a sufficiently large excess concentration $x=0.04$ show macroscopic according to neutron-diffraction data. However, samples transition an...
Zero-field (ZF), longitudinal field (LF), muon spin relaxation (\ensuremath{\mu}SR), and transverse (TF) rotation (\ensuremath{\mu}SR) measurements have been carried out on a polycrystalline sample ${\mathrm{CeRuSi}}_{2}$. ZF data show sharp increase in the rate below temperature 12 K (0.42 \ensuremath{\mu}${\mathrm{s}}^{\mathrm{\ensuremath{-}}1}$ at T=4.2 K), justifying transition to magnetically ordered state. From LF K, we found that magnetic fields muon,...
The muon spin relaxation was measured in the high-Tc superconductors Bi2(Sr1.3Ca0.7)CuO6.2, Bi2Sr2CaCu2O8.16, (Bi1.85Pb0.15)Sr2CaCu2O8.18 and (Bi1.83Pb0.25)Sr1.97Ca1.97 Cu3.07Ox. data were analysed order to determine London penetration depth lambda ab parallel basal plane. In all investigated samples revealed a temperature dependence which can be explained with framework of conventional BCS theory weak coupling limit.