A5100687594- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Molecular Spectroscopy and Structure
- Photochromic and Fluorescence Chemistry
- Organic Chemistry Cycloaddition Reactions
- Chemical Reaction Mechanisms
- Chemical Thermodynamics and Molecular Structure
- Solid-state spectroscopy and crystallography
- Advanced Chemical Physics Studies
- Free Radicals and Antioxidants
- Crystallization and Solubility Studies
- Photochemistry and Electron Transfer Studies
- Porphyrin and Phthalocyanine Chemistry
- Advanced Frequency and Time Standards
- X-ray Diffraction in Crystallography
- Dark Matter and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Synthesis and Characterization of Heterocyclic Compounds
- Organic and Inorganic Chemical Reactions
- Spectroscopy and Quantum Chemical Studies
- Advanced MRI Techniques and Applications
- Inorganic and Organometallic Chemistry
- Glass properties and applications
Ivanovo State University
2012-2024
Rutherford Appleton Laboratory
2007-2020
Petersburg Nuclear Physics Institute
1980-2019
Kurchatov Institute
2015-2019
Michelin (France)
2016-2017
Institut Laue-Langevin
2010-2016
Yaroslav-the-Wise Novgorod State University
2016
Lomonosov Moscow State University
1989-2016
N.D. Zelinsky Institute of Organic Chemistry
2001-2014
Institut Langevin
2013-2014
An experimental search for an electric dipole moment (EDM) of the neutron has been carried out at Institut Laue-Langevin, Grenoble. Spurious signals from magnetic-field fluctuations were reduced to insignificance by use a cohabiting atomic-mercury magnetometer. Systematic uncertainties, including geometric-phase-induced false EDMs, have carefully studied. The results may be interpreted as upper limit on EDM $|{d}_{n}|<2.9\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}e\text{...
We present the result of an experiment to measure electric dipole moment (EDM) neutron at Paul Scherrer Institute using Ramsey's method separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in long history EDM experiments probing physics violating time reversal invariance. The salient features this were use a Hg-199 co-magnetometer and array optically pumped cesium vapor magnetometers cancel correct for field changes. statistical analysis was performed...
We present for the first time a detailed and comprehensive analysis of experimental results that set current world sensitivity limit on magnitude electric dipole moment (EDM) neutron. have extended enhanced our earlier to include recent developments in understanding effects gravity depolarizing ultracold neutrons (UCN); an improved calculation spectrum neutrons; conservative estimates other possible systematic errors, which are also shown be consistent with more measurements undertaken...
The latest neutron electric dipole moment (EDM) experiment has been collecting data at the Institut Laue-Langevin (ILL), Grenoble, since 1996. It uses an atomic-mercury magnetometer to compensate for magnetic field fluctuations that were principal source of systematic errors in previous experiments. first results, combination with ILL measurement, yield a possible range values $(\ensuremath{-}7.0<{d}_{n}<5.0)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}26}e\mathrm{cm}$ ( $90%$...
We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of spin-precession frequencies stored ultracold neutrons and 199Hg atoms an axion-induced oscillating electric dipole moment neutron axion-wind effect. No signal consistent with is observed axion mass range 10−24≤ma≤10−17 eV. Our null result sets first laboratory constraints coupling to gluons, which improve astrophysical limits up 3 orders magnitude, also improves previous nucleons factor 40.Received 29...
Neutron lifetime is one of the most important physical constants: it determines parameters weak interaction and predictions primordial nucleosynthesis theory. There remains unsolved problem a 3.9\ensuremath{\sigma} discrepancy between measurements this using neutrons in beams those with stored ultracold (UCN). In our experiment we measure trapped by Earth's gravity an open-topped vessel. Two configurations trap geometry are used to change mean frequency UCN collisions surfaces; achieved...
Theories are developed to evaluate Larmor frequency shifts, derived from geometric phases, in experiments measure electric dipole moments (EDM's) of trapped, atoms, molecules, and neutrons. A part these shifts is proportional the applied field can be interpreted falsely as an moment. comparison made between our theoretical predictions for some results recent experiments, which shows agreement within experimental errors 15%. The also demonstrates that trapped particle EDM have reached a...
A clock comparison experiment, analyzing the ratio of spin precession frequencies stored ultracold neutrons and 199Hg atoms, is reported. No daily variation this could be found, from which set an upper limit on Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This first for free neutron. result also interpreted as a direct gravitational dipole moment neutron |gn| 0.3 eV/c2 m spin-dependent interaction with Sun. Analyzing Earth, based previous...
We performed ultracold neutron storage measurements to search for additional losses due (n) mirror-neutron (n′) oscillations as a function of an applied magnetic field B. In the presence mirror B′, would be maximal B≈B′. did not observe any indication nn′ and placed lower limit on oscillation time τnn′>12.0 s at 95% C.L. B′ between 0 12.5 μT.Received 26 May 2009DOI:https://doi.org/10.1103/PhysRevD.80.032003©2009 American Physical Society
The measurement of the neutron electric dipole moment (nEDM) constrains contribution CP-violating terms within both Standard Model and its extensions. experiment uses ultracold neutrons (UCN) stored in vacuum at room temperature. This technique provided last (and best) limit by RAL/Sussex/ILL collaboration 2006: dn < 2:9 × 10-26 e cm (90% C.L.). We aim to improve experimental sensitivity a factor 5 2-3 years, using an upgrade same apparatus. will take advantage increased density Paul...
A new intense superthermal source for ultracold neutrons (UCN) was installed at a dedicated beam line the Institut Laue-Langevin. Incident with wavelength of 0.89 nm are converted to UCN in 5-liter volume filled superfluid $^{4}\mathrm{He}$ temperature about 0.7 K. The can be extracted room experiments. We present cryogenic setup source, characterization cold neutron beam, and production measurements, where density least 55 per ${\mathrm{cm}}^{3}$ determined.
Ultracold neutrons (UCNs) play an important role for precise measurements of the properties neutron and its interactions. During past 25 years, a turbine coupled to liquid deuterium cold source at high-flux reactor has defined state art UCN production, despite long history efforts towards new generation sources. This Letter reports world-best density available users, achieved with based on conversion in superfluid helium. A volume 5 liters provides least 274 000 single accumulation run....
The search for an electric dipole moment (EDM) of the neutron is a crucial test theoretical particle physics models with violation time and spatial invariance. A new experiment recently has been carried out at High-Flux Reactor Institut Laue-Langevin, using upgraded double-chamber magnetic resonance spectrometer developed Petersburg Nuclear Physics Institute. result interpreted as upper limit on value EDM,...
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty 0.8 ppm. We employed apparatus where ultracold neutrons and mercury atoms are stored in same volume report result γn/γHg=3.8424574(30).
Magnetic-field uniformity is of the utmost importance in experiments to measure electric dipole moment neutron. A general parametrization magnetic field terms harmonic polynomial modes proposed, going beyond linear-gradients approximation. We review main undesirable effects nonuniformities: depolarization ultracold neutrons and Larmor frequency shifts mercury atoms. The theoretical predictions for these were verified by dedicated measurements with single-chamber neutron...
The molecular structure and conformational properties of benzenesulfonamide, C6H5SO2NH2, were studied by gas electron diffraction (GED) quantum chemical methods (MP2 B3LYP with different basis sets). calculations predict the presence two stable conformers NH2 group eclipsing or staggering SO2 group. eclipsed form is predicted to be favored about 0.5 kcal/mol. According GED, saturated vapor over solid benzenesulfonamide at a temperature 150(5) degrees C consists conformer. GED intensities,...