A. Efremov
A5071927214- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Essential Oils and Antimicrobial Activity
- Phytochemistry and Biological Activities
- Phytochemicals and Antioxidant Activities
- Natural product bioactivities and synthesis
- Magnetism in coordination complexes
- Metal-Organic Frameworks: Synthesis and Applications
- Lanthanide and Transition Metal Complexes
- Phytochemical and Pharmacological Studies
- Particle Detector Development and Performance
- Biological Activity of Diterpenoids and Biflavonoids
- Medicinal plant effects and applications
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic confinement fusion research
- Dark Matter and Cosmic Phenomena
- Teaching and Learning Programming
- Embedded Systems Design Techniques
- Cynara cardunculus studies
- Nuclear physics research studies
- Lichen and fungal ecology
- Catalytic Processes in Materials Science
- Human Health and Disease
- Healthcare Systems and Public Health
International Tomography Center
2022-2024
Novosibirsk State University
2022-2024
Siberian Federal University
2021-2024
Siberian Branch of the Russian Academy of Sciences
2024
Krasnoyarsk State Medical University
2024
Krasnoyarsk Scientific Center
2023
Joint Institute for Nuclear Research
1982-2022
Max Planck Institute for Software Systems
2020
Max Planck Society
2020
Princeton University
2020
To study fundamental questions of hadron and nuclear physics in interactions antiprotons with nucleons nuclei, the universal PANDA detector will be built. Gluonic excitations, strange charm quarks nucleon structure studies performed unprecedented accuracy thereby allowing high-precision tests strong interaction. The proposed is a state-of-the art internal target at HESR FAIR detection identification neutral charged particles generated within relevant angular energy range. This report...
The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This was designed to perform exclusive measurements processes several charged and/or neutral particles in final state. Making use a large part apparatus that previously built spin structure studies muon beam, it also features new target system as well or upgraded detectors. is able operate at high incident flux available CERN. It characterised by angular and momentum coverages, nearly flat...
The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV/$c$ pions into the $\pi^-\pi^-\pi^+$ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins $3\pi$ mass and four-momentum transfer isobar model so far largest PWA consisting 88 waves. narrow $J^{PC} = 1^{++}$ signal is observed $f_0(980)\,\pi$ channel. We present resonance-model study subset spin-density matrix selecting states with 2^{++}$ $4^{++}$ decaying...
The COMPASS experiment at the CERN SPS has studied diffractive dissociation of negative pions into π−π−π+ final state using a 190 GeV/c pion beam hitting lead target. A partial wave analysis been performed on sample 420 000 events taken values squared 4-momentum transfer t′ between 0.1 and 1 GeV2/c2. well-known resonances a1(1260), a2(1320), π2(1670) are clearly observed. In addition, data show significant natural-parity exchange production resonance with spin-exotic quantum numbers JPC=1−+...
The Sivers function describes the correlation between transverse spin of a nucleon and motion its partons. For quarks, it was studied in previous measurements azimuthal asymmetry hadrons produced semi-inclusive deep inelastic scattering leptons off transversely polarised targets, found to be non-zero. In this letter evaluation for gluons is presented. contribution photon–gluon fusion subprocess enhanced by requiring two high transverse-momentum hadrons. analysis method based on Monte Carlo...
The COMPASS experiment recently discovered a new isovector resonance-like signal with axial-vector quantum numbers, the $a_1(1420)$, decaying to $f_0(980)\pi$. With mass too close and width smaller than ground state $a_1(1260)$, it was immediately interpreted as light exotic meson, similar $X$, $Y$, $Z$ states in hidden-charm sector. We show that fully matching experimental data is produced by decay of $a_1(1260)$ resonance into $K^\ast(\to K\pi)\bar{K}$ subsequent rescattering through...
We have searched for exclusive production of exotic charmonia in the reaction $\mu^+~N \rightarrow \mu^+ (J\!/\!\psi\pi^+\pi^-)\pi^{\pm}~N'$ using COMPASS data collected with incoming muons 160 GeV/$c$ and 200 momentum. In $J\!/\!\psi\pi^+\pi^-$ mass distribution we observe a signal statistical significance 4.1 $\sigma$. Its width are consistent those $X(3872)$. The shape $\pi^+\pi^-$ from observed decay into shows disagreement previous observations may be interpreted as possible evidence...
We study the spin-exotic $J^{PC} = 1^{-+}$ amplitude in single-diffractive dissociation of 190 GeV$/c$ pions into $\pi^-\pi^-\pi^+$ using a hydrogen target and confirm $\pi_1(1600) \to \rho(770) \pi$ amplitude, which interferes with nonresonant $1^{-+}$ amplitude. demonstrate that conflicting conclusions from previous studies on these amplitudes can be attributed to different analysis models treatment dependence squared four-momentum transfer we thus reconcile their experimental findings....
Probes sensitive to mechanical stress are in demand for the analysis of pressure distribution materials, and design sensors based on metal-organic frameworks (MOFs) is highly promising due their structural tunability. We report a new pressure-sensing material, which UiO-66 framework with trace amounts spin probe (0.03 wt%) encapsulated cavities. To obtain this we developed an approach encapsulation stable nitroxide radical TEMPO ((2,2,6,6-tetramethylpiperidin-1-yl)oxyl) into micropores...
Nitrogen oxides are adverse poisonous gases present in the atmosphere and having detrimental effects on human health environment. In this work, we propose a new type of mesoporous materials capable capturing nitrogen monoxide (NO) from air. The designed material combines robust Santa Barbara Amorphous-15 silica scaffold ultrastable Blatter-type radicals acting as NO traps. Using situ electron paramagnetic resonance spectroscopy, demonstrate that capture air is selective reversible at...
The COMPASS Collaboration at CERN has investigated the ${\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ reaction center-of-momentum energy below five pion masses, $\sqrt{s}<5{m}_{\ensuremath{\pi}}$, embedded in Primakoff of 190 GeV pions impinging on a lead target. Exchange quasireal photons is selected by isolating sharp Coulomb peak observed smallest momentum...
We present a new amplitude analysis of the ηπ D-wave in reaction π−p→ηπ−p measured by COMPASS. Employing an analytical model based on principles relativistic S-matrix, we find two resonances that can be identified with a2(1320) and excited a2′(1700), perform comprehensive their pole positions. For mass width a2 M=(1307±1±6) MeV Γ=(112±1±8) MeV, for state a2′ obtain M=(1720±10±60) Γ=(280±10±70) respectively.
The paper presents the results of design and simulation linear impulse control systems a plasma unstable vertical position for three DINA-L models tokamak T-15. were obtained from plasma-physics DINA code on current flat top T-15 scenario corresponded to different locations horizon field coil: outside toroidal coil, between coil vacuum vessel, inside vessel. For controllers loop shaping approach was used. designed simulated in feedback with types power supply models: element, pulse-width...
Exclusive production of the isoscalar vector mesons $\omega$ and $\phi$ is measured with a 190 GeV$/c$ proton beam impinging on liquid hydrogen target. Cross section ratios are determined in three intervals Feynman variable $x_{F}$ fast proton. A significant violation OZI rule found, confirming earlier findings. Its kinematic dependence invariant mass $M_{p\mathrm{V}}$ system formed by $p_\mathrm{fast}$ meson $V$ discussed terms diffractive $p_\mathrm{fast}V$ resonances competition central...
By the method of exhaustive hydroparodistillation, essential oil was obtained from Siberian pine (Pinus sibirica Du Tour) and fir (Abies Ledeb.), growing on territory Krasnoyarsk territory. Separate fractions were obtained: first one after 45 min beginning distillation, second – 2 hours, third 5 fourth-after 10 fifth fraction collected end hydrodistillation. The antimicrobial activity separate P. A. studied against strains opportunistic microorganisms: Escherichia coli, Pseudomonas...
Introduction. Plants of the pine family, growing mainly in Northern Hemisphere, are interest both from an economic and medical point view. The antimicrobial properties essential oils coniferous plants being actively studied. Objective: to study activity oil fractions Siberian fir Scotch Krasnoyarsk Territory. Material methods. Essential were isolated by hydrosteam distillation on all-metal installation with a Clevenger nozzle. component composition was determined gas chromatography-mass...
Metal-organic frameworks (MOFs) draw increasing attention as nanoenvironments for chemical reactions, especially in the field of catalysis. Knowing specifics MOF cavities is decisive many these cases; yet, obtaining them situ remains very challenging. We report first direct assessment apparent polarity and solvent organization inside using a dedicated structurally flexible spin probe. A stable β-phosphorylated nitroxide radical was incorporated into prospective ZIF-8 trace amounts. The...