Annular dose, AD is a concept deduced from radial dose simulated codes that enables one to draw a map of dose distribution around the ion’s path at the nanometer scale. The distribution of dose for different equal LET elements' groups of the same LET (in keV.µm-1) were studied using this concept.
- Annular-dose (AD) is a new conception introduced, based on the radial dose...
The neutron activation analysis as a primary method for determination of mass fraction of high number of elements was applied for investigation of their temporal and spatial distribution among edible mussels and oysters. It allowed to find levels of the 29 macro and microelements in soft tissues and 24 in shells of such molluscs. To compare the samples of wild and farmed mussels were collected...
The immunocytochemical staining and fluorescence microscopy was used to investigate the effects of radiosensitization by the cytosine arabinoside AraC on the induction and repair of DNA double-strand breaks (DSBs) in normal human dermal fibroblasts and human glioblastoma U87. Cells were irradiated with 1.25 Gy of Bragg peak protons (LET = 2 – 25 keV/μm) and accelerated nitrogen ions with doses...
Abstract. Thesis concerns to a popular theme the fractal dimension of various objects and structural formations. The relevance of the theme is followed of the extensive literature in various fields of modern natural science on the use of fractals and the calculation of fractal dimensions of objects. The box-counting method, used in such distant fields as economics, medicine et cetera is...
Recreational zones play an important role in human life in urban environment. The activities of natural radionuclides and $^{137}$Cs were determined by low background γ-ray spectrometry in soil samples collected at two depths (0–5 and 5–20 cm) in 15 recreational zones of Moscow. The average activity concentrations of analyzed radionuclides were 519, 35.1, 29, 1.9 and 8.0 Bq/kg for $^{40}$K,...
We performed the Metropolis calculations of the thermodynamic properties of the system of dipoles on a 2D pentagonal Cairo lattice and revealed two explicit peaks in the temperature behavior of the heat capacity. This system is a sort of spin ice, which was experimentally studied in [Phys. Rev. Materials 3, 104402, 2019].
The low-temperature peak is due entirely to long-ranged dipole-dipole...
Computation of the pi0gg decay width at high temperatures in the framework of the Nambu-Jona-Lasinio model requires the calculation of an integral with singularity 1/(x-c). To solve the problem, the most suitable method must be found that can effectively bypass the singularity and allow to obtain an answer with a minimal error and the high computation speed. In this work were considered...
Proton-Boron Capture Therapy (PBCT) is a novel approach of radiation therapy aimed at enhancing proton biological effectiveness to cancer cell killing. PBCT uses a nuclear fusion reaction between low-energy protons and 11B atoms, which produces highly DNA-damaging α-particles. As a result of the interaction of low energy proton with 11B nucleus, three alpha particles are generated, which...
The previously characterized viral channelrhodopsin VirChR1 shows the necessary characteristics of an optogenetic tool. It also shows a unique impermeability for Ca$^{2+}$ ions, presumably helping avoid the impact of calcium influx, which is useful for the neuroscientific applications of optogenetics. VirChR1’s ability to drive neural firing is compromised by the low ion conductance. To fix...
Baryonic Matter at Nuclotron (BM@N) is the first experiment at the NICA accelerator complex. The aim of the BM@N experiment is to study interactions of relativistic heavy ion beams with fixed targets. Detectors based on Gas Electron Multipliers (GEM) are used of the central tracking system, which is located inside the BM@N analyzing magnet. The next BM@N physics run is planned at the end of...
Alzheimer’s disease (AD) is a neurodegenerative disorder that is the sixth leading cause of death and the most common cause of brain dementia worldwide. Over the last years, representative advancements have been made in our understanding of AD by studying the molecular mechanisms underlying amyloid-β(Aβ) and tau proteins pathology.
In general, AD is characterized by the deposition of...
The dependencies of the average kinematical characteristics of the negative and positive pions, produced in 12C+12C collisions at 4.2 A GeV/c, on the collision centrality have been investigated. The number of the produced negative pions per participant nucleon of a projectile 12C nucleus, the average inelasticity coefficients of π−mesons, and the shapes of their full and transverse momentum...
The samples were analyzed by means of annihilation line Doppler broadening (DB) spectrometry using variable positron energy at the Dzhelepov Laboratory of Nuclear Problems, JINR in Dubna, Russia. A monoenergetic positron beam 4 mm in diameter was used; the positron energy varied from 0.1 keV to 22 keV. Annihilation γ radiation was recorded by the HPGe detector model GEM25P4-70 (AMETEK ORTEC,...
Control problems for nonlinear models of heat and mass transfer of a viscous and viscous conducting fluid are studied. It is assumed that the coefficients in equations and boundary conditions of the considered models depend non-linearly on the substance concentration and on the temperature, as well as on spatial variables. Thus, the heat and mass transfer models used in this work generalize...
Nowadays, space exploration is undergoing intensive investigation, and semiconductor electronic equipment in space operates in an environment irradiated by high-energy particles. MeV electrons and protons are present in the near-Earth space environment, where they are more intense, so the study was carried out in these simulated space conditions (energy, vacuum, temperature).
The effects of...
Intense fluxes of very cold neutrons (VCN) with the velocities between 20 and about 200 m/s are of great interest for a variety of applications both in fundamental research and neutron scattering. However, the absence of efficient VCN reflectors was one of the most significant problems for developing the intense VCN sources. The reflectors allow neutrons to be extracted from the source,...
When treating cancer with proton beams, it is important to obtain flat dose plateau of the beam covering target volume where the tumor is located [1]. In the dynamic irradiation method, the beam energy is changed using range-shifter to create the Spread-out Bragg peak (SOBP) at the required distance. In this work, the relationship between Plexiglas range-shifter and Bragg peak position was...
BM@N (Baryonic Matter at Nuclotron) is the first fixed target experiment at NICA Facility at JINR (Dubna, Russia). It is designed to study nuclear-nuclear collisions at high densities. The research program in Run-7 was devoted to studies of cross section of inelastic reactions Ar + A → X with the beam kinetic energy from 2.3 to 3.5 GeV and different targets: C,Al,Cu,Pb,Sn.
The report...
We consider the light-like trajectories of a massive relativistic anyon travelling in a uniform stationary magnetic field. We show that the classical particle paths are helical lines with the light-like tangent vector. The configuration of magnetic field determines the equations of motion for the symmetry axis of helix, while the step of helix is determined by spin. The deviation of the...
Contrast agents (CA) are a well-established type of chemicals, used to enhance the contrast of tissues or vessels screened with non-invasive medical imaging modalities, such as computed tomography and magnetic resonance imaging, when introduced inside the body. Although many commercially available CAs are made of metal atom and chelate molecule, there is another promising composition of CAs,...
A central goal of current relativistic heavy-ion experiments is to study the properties of the hot and dense QCD matter. Such studies provide better insight in the QCD phase diagram, as well as the transport coefficients of the strongly-coupled Quark Gluon Plasma (sQGP). Anisotropic flow measurements of identified particles play an essential role in such studies.
We report on the results of...
The reconstruction of elementary particle trajectories (tracking) is an important part of event reconstruction in high-energy physics experiments. The recurrent neural network model TrackNETv3 was proposed as an analogue to classical tracking methods based on the Kalman filter, which allowed us to obtain high tracking efficiency values for the BM@N and BES-III experiments. Based on previous...
The theranostics approach in nuclear medicine is based on the use of radiopharmaceuticals with similar chemical behavior, that enable both therapeutic and diagnostic applications with well managed kinetics and biodistribution in the body. As radionuclides are the active agents for such medicine, the most appropriate solution for the purpose is to use radioisotopes of the same chemical element,...
The problem of full-scale ground-based modeling of cosmic radiation using heavy ion accelerators for space radiobiology is very relevant. A new type of cosmic radiation simulator based on a $^{56}$Fe ion beam with an energy 1 GeV/n is proposed. The simulator uses rotating converters consisting of segmented targets of various thicknesses. This design ensures the uniformity of the fields of all...
The paper presents the performance studies of the scintillation detector prototype with SiPM readout using different types of the front-end electronics (FEE).
The timing and amplitude resolutions with LED have been obtained. These results can be applied for the proton and deuteron beams polarimetry at the Internal Target Station at Nuclotron.
We present a use case of our SU2 software package of SU(2) scalars. The package offers seamless F77-style coding in C++ for the user, but comes with move-semantix and polymorphic implementations of sub-scalars: arithmetic_scalar and cpx<same>, which is essential for a scientific library (such as our NXV4 library). The use case we present if of a driven damped harmonic oscillator, known to...
A dilution cryostat and a hydrogen gas cell for a novel method of precision measurement of the polarization of a high-power electron beam with almost 100% polarization are discussed. An ultracold magnetic trap for polarized atomic hydrogen gas in a strong magnetic field is used as a target for electron beam polarimetry based on Møller scattering. JINR is performs calculations, design work and...
A Josephson junction spintronic model is investigated by means of the two-stage Gauss–Legendre algorithm for numerical solution of the respective system of nonlinear differential equations in a wide range of physical parameters. Parallel implementation is based on the MPI and OpenMP techniques. The simulations have been carried out at the Heterogeneous Platform “HybriLIT” and on the...
In this paper we study the properties of particles in hot and dense
nuclear matter within the framework of the SU(3) Nambu - Jona - Lasinio
model. To calculate the mass and width of diquars (scalar, pseudo
scalar, vector, axial vector) as functions of temperature, the
Bethe-Salpeter equation is presented as a system of two equations. To
solve a self-consistent system of the nonlinear...
Жидко-Водородные мишени являются неотъемлемой частью большинства экспериментов физики высоких энергий. Конструкции данных мишеней сочетают в себе массу уникальных технических решений в ответ на специфические требования, выдвигаемые условиями физических экспериментов и безопасностью работы с водородом. В статье изложен опыт создания первой жидко-водородной мишени с криорефрижераторным...
Neutron reflectors are widely used to store, extract, focus and deliver neutrons to experimental facilities. For the last almost 20 years, Detonation NanoDiamond (DND) powders have been actively studied as a material for efficient diffuse reflectors of Very Cold Neutrons (VCN) with the velocities of 40-150 m/s. Moreover, the DND powder reflects cold neutrons (up to 1000 m/s) quasi-specularly...
In Superconductor-Ferromagnet-Supperconductor structure with noncentrosymmetric ferromagnetic interlayer is observed anomalouse Josephson effect. In this structure current-pahse relation demonstrates phase shift Phi-0, which is proportional to the magnetisation of ferromagnetic layer and such junction are colled Phi-0 junction.
In this work we simulate dynamics of single junction SQUID...
The dynamics of recovery of the open porous structure in HDPE films, which are preliminarily uniaxially deformed in the medium of supercritical CO2 followed by shrinkage in the longitudinal direction, upon their repeated stretching in air is studied by structural mechanical methods. The process of shrinkage is accompanied by the approach of lamellas and the disappearance of the oriented...
The Baryonic Matter at Nuclotron experiment (BM@N) aims to study the area of QCD phase diagram at high net baryon densities and moderate temperatures with collisions of heavy ions at $\sqrt{s_{NN}}$ = 2.3–3.5 GeV. Anisotropic transverse flow is one of the most important observable phenomena in a study of the properties of matter created in such collisions. Flow measurements require the...
There is a model that includes viscosity at the lambda point in the transition to the superfluid state. This viscosity is expressed in terms of composite operators of dimension 8, but composite operators of dimension 6 are mixed with them. In dynamics, composite operators were almost not considered, but dynamic operators of dimension 6 can be investigated without additional calculations.
Today, low and middle energy accelerators (linac, cyclotron) play an important role for the study of the nuclei structure, for the radiation material science, for the production of radionuclides used in medical technologies and for the cancer treatment. One of the main goals for these accelerators operation is to improve the quality of the extracted beams. Therefore, one can develop the system...
We propose higher-derivative dual representation for the massless spin two theory by the third-rank tensor with hook Young diagram. Using the general procedure for including Stueckelberg fields with reducible gauge symmetry, we demonstrate that we can switch between different dual formulations by the choice of gauge-fixing conditions in the Stueckelberg action. For the massless spin two field...
The aggregation of the β-amyloid peptide (Aβ) is known to contribute to the accumulation of amyloid plaques in brain, which leads to the formation of a variety of diseases such as Alzheimer's. This work focuses on the conformational changes of Aβ (1-42) in the lipid membrane. The study was carried out by Raman spectroscopy, which is non-invasive, fast and does not require any sophisticated...
Standard radiotherapy for neoplasms is associated with a high risk of post-radiation damage. Due to this, the task of increasing the radiosensitivity of the tumor to radiation is relevant. One such promising medication is the synthetic nucleoside AraC (cytosine arabinoside). The aim of the work was to study the effect of the combined use of protons at a dose of 3 Gy and AraC on the...
We consider a statistical mechanics of a rotating gas of massive relativistic particles with nonzero spin. Applying the formalism of Gibbs ensembles, we derive a one-particle distribution function by positions, momenta, and directions of spin. For zero angular velocity, the distribution coincides with well-known Maxwell-Juttner distribution. For nonzero angular velocity, corrections caused by...
The technological application of nanoscale functional elements made of individual molecules is a promising approach towards the miniaturization of electronic devices. In particular, there is a potential for exploiting quantum interference effects in controlling the charge transport in these molecular-scale devices.
The electronic conduction G=I/V is determined by the electronic current I...
We consider the motion of a non-relativistic charged particle with an arbitrary spin in central potential Ze/r in terms of classical mechanics. We show that the spin-orbital interaction causes the precession of the plane of orbit around the vector of total angular momentum. The angular velocity of precession depends on the distance of the particle from the center. The effective potential for...
Studies of nuclei with proton or neutron excess remain highly relevant in modern nuclear physics. New information about the nature of baryon-baryon interactions can be extracted from properties of hypernuclei near the stability limits. ΛN-interaction is attractive, therefore, addition of a Λ-hyperon to non-strange nuclei can lead to an increase in the binding energy and formation of a bound...
The NA-62 is a CERN fixed-target experiment upgraded from the NA-48 detector at the Super Proton Synchroton. The main scope of NA-62 is the study of the ultra-rare kaon decays in a higher luminosity context than the E-949 experiment of the C4 beamline (LESB III) at the AGS-Synchrotron (Brookhaven National Laboratory). Since in the Standard Model the branching ratios are almost completely...
Di-hadron angular correlations are a useful tool to study the mechanisms of particle production by observing the angular separation (∆η, ∆φ) between pairs of particles in an event. Different structures in the ∆η − ∆φ space are caused by various modes of particle production and interactions between particles shortly after production. Examining these structures can give us insight into the...
This study describes the detecting device development and approbation using for measurement of the flux density distribution in the transverse plane of the high-energy charged particle beams by the multi-angle scanning method. Currently, for the implementation of ion and proton radiotherapy procedures high-precision monitoring systems are needed to determine such characteristics of the beams...
The study of cultural heritage by modern scientific methods is an important interdisciplinary field. Of particular interest are archaeological finds made of metal. They store valuable information about the technological, economic and social level of ancient states. Corrosion processes occurring in metals also require careful study. This allows the development of restoration and conservation...
The NA64 experiment is a fixed-target experiment at the CERN SPS combining the active beam dump and missing energy techniques to search for rare events. The experiment looks for new particles such as dark photons, axion-like particles, new light X or Z’ bosons by colliding 100-150 GeV energy electron or muon beams onto an active target.
The report presents the muon part of the experiment. The...
Following the study for SU(2) case with zero bario -chemical potential, a dual QCD formulation for SU (3) color gauge has been proposed to be constructed in terms of dual gauge potentials which takes into account the local as well as the topological structure of the color gauge group into its dynamics. The dynamical configuration of the resulting dual QCD vacuum and its flux...
The relativistic rotation causes a change in QCD critical temperature. Various phenomenological and effective models predict a decrease in the critical temperature in rotating QCD. Nevertheless, it follows from lattice simulations that the critical temperature in gluodynamics increases due to rotation. But in QCD the rotation acts on both gluons and fermions, and combination of these effects...
Relativistic rotation may have some impact on various properties of quark-gluon plasma. For example, lattice simulations show an increase in critical temperature of both QCD and gluodynamics due to rotation. In this report the first lattice study of an effect of rotation on gluodynamics’ equation of state will be presented. In particular, it will be shown that in deconfinement phase rotation’s...
Improved thermal barrier coatings (TBCs) will enable future gas turbines to operate at higher gas temperatures [1]. Considerable effort is being invested, in identifying new materials with even better performance than the current industry standard, yttrium stabilized zirconia (YSZ) [2]. Turbines should operate at as high temperature as possible to maximize their efficiency. Until about 15...
A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton-proton collision data at a center-of-mass energy of 13 TeV, collected by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of 137 fb$^{−1}$. The search uses the decay channels Z$\rightarrow$ee and...
The talk is devoted to an explicit cutoff regularization of the Green's function for a covariant Laplace operator. It is planned to give definitions, explain properties (spectral representation, homogenization, covariance), and formulate results for the case of the four-dimensional Yang-Mills theory.
Due to their outstanding physical properties, graphene and related materials have a huge potential for applications in electronic and optical devices. In our research graphene layers are obtained by liquid phase exfoliation (LPE) method for the application in SAW sensors. On the other hand, stochiometric lithium niobate (LN) is the best material for such applications, because of its...
This paper describes the implementation of a neural network for the problem of classifying the Higgs boson production signal in association with a single top quark (pp to Ht) and the main background processes (tt, ttH, ttW, ttZ). The tH channel is sensitive to the sign of the coupling, unlike ttH. Also, an accurate Higgs-top cross-section will allow setting the limits of the coupling constant...
In this work forward proton scattering in association with lepton pairs produced via the photon fusion mechanism process was studied. The ATLAS collaboration
has managed to measure the cross sections of the process above. Here analytical formulas for the corresponding cross-sections were derived. These formulas allow for simple numerical integration instead of the usual Monte Carlo approach...
Due to their outstanding physical properties, graphene and related materials have a huge potential for applications in electronic devices such as FETs with graphene channels and graphene-based sensors. So, one of the most important characteristics of graphene film is the I-V characteristics. In this research the authors discuss the I-V characteristics of few-layer graphene obtained by liquid...
Developing efficient cathode materials is very important task for the wide distribution of the electrochemical devices, in particular sodium-ion batteries (SIB). One of the perspective cathode materials for SIB is an iron (III) hexacyanoferrate (II) (Prussian White, PW) currently being produced by Altris AB, Sweden [1]. It is one of Prussian Blue Analogues AxM’[M(CN)6]1-y·zH2O (where A is an...
\documentclass{article}
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\begin{document}
\begin{center}
\textbf{RADIATION CORRECTIONS TO PROMPT PHOTON PRODUCTION IN
COMPTON SCATTERING OF QUARK-GLUON }$qg\to q\gamma $ \textbf{AND ANNIHILATION OF
QUARK-ANTIQUARK PAIR }$q\bar{q}\to g\gamma $\textbf{PROCESSES }
\textbf{}
\textbf{M.R....
In this article, the effects of geometrical and Physical properties of gyroidal graphene and porous silicon of Cantor sequence terminated by gyroidal layer are studied for Gas sensing applications. The study is investigated in THz frequencies with transverse electric polarized light. Gyroidal graphene layers have good tunable optical properties and can excite Tamm resonance due to the metallic...
As confirmed by theory and measurements, one, two or three neutrons are emitted frequently in ultraperipheral collisions (UPC) of heavy relativistic nuclei, in particular, $^{208}$Pb. The exchange of soft equivalent Weizs\"{a}cker--Williams photons dominates in such interactions. This leads to the excitation and decay of Giant Dipole Resonances (GDR) in colliding nuclei typically below the...
We consider the class of spinning particle theories, whose quantization corresponds to the continuous helicity representation of the Poincare group. The classical trajectories of the particle are shown to lie on the parabolic cylinder with a lightlike axis irrespectively to any specifics of the model. The space-time position of the cylinder is determined by the values of momentum and total...
The design of the magnet and the characteristics of the magnetic field will be discussed. A parametric 3D model was made for a fast sectors' shape adjustment to make the magnetic field isochronous.
Semileptonic flavor changing neutral current transitions with a pair of neutrinos in the final state are very accurately determined in the standard model (SM) and thus provide an accurate and sensitive probe for physics beyond the SM. Until recently, the poor tagging efficiency for the $B\to K^{(*)}\nu\bar{\nu}$ modes made them less advantageous as a probe of new physics (NP) compared to the...
Vector analyzing power in quasielastic proton-proton scattering was obtained
at the Nuclotron Internal Target Station using a polarized deuteron beam and
a polyethylene target. The selection of useful events was performed using the
time and amplitude information from scintillation counters. The asymmetry on
hydrogen was obtained by the subtraction of the carbon background. The
values of...
The constant monitoring of the uniformity of the density distribution of the flux of the accelerated particles is required in various applied fields as such as the studies of biological objects and of radiation resistance of electronic devices. The ionization monitor has been developed at FLNR JINR in order to make the non-destructive detailed high precision measurement of the transverse...
The physics of bottom hadrons plays a fundamental role both in the precision tests of the Standard Model (SM) and in searches of possible New Physics (NP). Rare B-meson decays, which are induced by the Flavor-Changing Neutral Currents (FCNCs) $b \to s (d)$ transitions, provide a stringent test of the SM in flavor physics. Being loop-induced in the SM, these transitions are suppressed and NP...
For a variety of reasons, Russians begun the research and development of a range of small power reactors from the late 1950’s. After about 30 years, the focus changed to the provision of electricity and district heating to remote and hard-to reach areas. The multipurpose and co-generational activities of these floating nuclear power plants (FNPP) have generated enormous attention. An essential...
The field theory of open quantum systems has ample applications in areas like particle or nuclear physics, cosmology and quantum gravity. Open quantum systems are commonly described by reduced density matrices, which are obtained by tracing out the environmental degrees of freedom, and whose evolution is given by quantum master equations. Solving such equations often poses an intricate or even...
Particle Identification (PID) analysis for the Multi-Purpose Detector (MPD) with TPC signals. Data is generated by implementing the MPDROOT software of the NICA experiment. Transporting and track reconstruction for Bi-Bi collisions at center-of-mass energy of 11 GeV is simulated. The PID is computed using a statistical technique (Bayesian Method) for Bethe-Block signal and machine learning...
The virtual model of the accelerator is a computational-theoretical model supplemented with options for simulating beam diagnostics and accelerator control tools. At this stage of the NICA project implementation, the virtual Booster model allows, along with theoretical research in the field of beam dynamics, to work out various methods for tuning accelerator settings.
The properties of the collective low-lying states of Zr isotopes indicate that some of these states are mainly spherical and the other are mainly deformed ones. In our previous works, it was shown that the structure of low-lying collective states of 96Zr can be satisfactorily described within the framework of a geometric collective model based on the Bohr Hamiltonian with a potential that...
For clarifying the validity of the Lepton Universality hypothesis, the interaction cross section for all three flavors of leptons have to be known with high precision. In neutrino sector, for electron and muon neutrinos, the interaction cross section is known fairly well, but for tau neutrino only poor estimations exist. In particular, the most direct measurement by the DONuT experiment was...
Half-Heisler magnetic intermetallic compounds of transition metals exhibit interesting physical properties such as magnetoresistance, ferromagnetic and antiferromagnetic magnetic states, and superconductivity. It is observed the shape memory effect and superelasticity with opportunity to control there phenomena by means magnetic field. It makes these compounds promising materials to apply for...
Nowadays studying of proximity effects at the interface between two media are in focus of view [1-5]. In particular it relates to the interface between superconductor and ferromagnet. The work [3] can be can demonstrate as representative experiment, where diamagnetism of the [Nb(25nm)/Gd($d_{f}$)]$_{12}$ periodic heterostructure was observed. The magnetic field was displaced from the volume of...
The main goal of the Baikal-GVD project is to detect high-energy astrophysical neutrinos. In particular, the telescope's aim is to register the Cherenkov radiation emitted during the passage of secondary charged particles formed as a result of neutrino reactions with the environment through the deep waters of Lake Baikal. In addition to Cherenkov radiation, ambient background noise and...
The study of ferrites of spinel type is of great importance due to the wide variety of their structural and magnetic properties, which are of interest from the point of view of fundamental and applied research. In particular, canted states of an antiferromagnet, ferrimagnet, and spin glass can be realized in these compounds [1].
Significant saturation magnetization, relatively high electrical...
Performance of carbon nanomaterials in electrochemical charge storage is highly dependent on the conductivity of the material, presence of pseudocapacitive functional groups, porosity and the structure. Graphene oxide (GO) is has interesting surface chemistry and structural properties that can be further modified in different ways. Additionally, 2D nature and different active sites make this...
The search for neutrinoless double $\beta$-decay, in particular double K-capture, is of great importance. Confirmation of its existence would mean that the neutrino is Majorana particle. The investigation of this process provides one of the best opportunities to study physics beyond the Standard Model. The double electron capture process 2EC2$\nu$ was experimentally discovered only once in the...
The formation of stable aqueous suspensions and the possibility of surface functionalization make graphene oxide (GO) a great material for composite materials. In this work, physicochemical properties of composites of GO and CoFe2O4 (CFO), including CFO doped with zinc (CFO_Zn) and gallium (CFO_Ga) were investigated. CFO, CFO_Zn, CFO_Ga nanoparticles were prepared by the solvothermal method...
The experimental observations from the colliders established the standard model (SM), is the most
successful phenomenological framework to explain the non-gravitational interactions of fundamental
particles at high energy. Non-zero neutrino mass and dark matter cast a shadow over its success.
This necessitates the extension of the SM. The most straightforward and elegant extension of the...
The IceCube neutrino observatory measures the diffuse flux of high-energy astrophysical neutrinos by means of various techniques, and there exists a mild tension between spectra obtained in different analyses. The spectrum derived from reconstruction of muon tracks is harder than that from cascades, dominated by electron and tau neutrinos. If confirmed, this tension may provide a clue to the...
Nanocomposites have enriched modern material systems, contributed to sustainable progress in material science and engineering and improved quality of living. Among other aspects, the surface chemistry of nanomaterials is very important for preparation of nanocomposites. In this study we have analyzed the change in surface chemistry of graphene oxide (GO) and its nanocomposite with...
Bismuth vanadate (BiVO4) has attracted a lot of attention as a promising photoanode for use in the photoelectrochemical (PEC) water splitting. It posseses numerous advantageous features such as great visible light harvesting properties, band edge positions and low-cost synthesis method. The major drawback of BiVO4 is poor charge transfer properties due to the high rate of electron-hole...
We have theoretically investigated the molecular orientation by a asymmetric potential created by the superposition of two-color laser fields. The time-dependent Schrodinger equation is solved numerically for different field parameters. We have compared the quantum dynamics with the solution of the classical equations and have described the conditions, where the classical physics description...
We propose and study the new (generalized) E-type $\alpha$-attractor models of inflation, in order to include formation of primordial black holes (PBHs). We numerically investigate the phases of inflation, derive the power spectrum of scalar perturbations, and calculate the PBHs masses. For the certain values of the parameters, the asteroid-size PBHs can be formed with the masses of $10^{17}...
A cold neutron storage project is being considered for the projected NEPTUNE reactor. The neutron density in the storage is determined by the absorption and scattering (leakage) of neutrons on the walls of the storage. To determine the probability of neutron leakage, it is proposed to use a neutron wave resonator in which the probabilities of the studied processes are increased. The resonator...
Studies of light propagation in random media are of great importance in many areas of physics, such as, for example, astrophysics, biophotonics, particle physics, applied researches. Understanding and optimization of particles detector’s response usually requires extensive simulations of photons transportation, often performed with Monte-Carlo techniques. Powerful Monte-Carlo
methods,...
We review the mathematical foundations of Exceptional Drinfel'd Algebras. We present a brief account of Manin Triples which defines the algebra corresponding to T-duality and review the mathematical derivation of Exceptional Drinfel'd Algebras which constitute the algebra defining U-dualities. We present our results of classification of all 4+6 dimensional Exceptional Drinfel'd Algebras and...
We investigate the thermal dilepton and photon production yields from relativistic heavy ion collisions in presence of both shear and bulk viscosities by employing the recently developed second order viscous hydrodynamic framework within a quasiparticle description of hot QCD medium. The sensitivity of shear and bulk viscous pressures to the temperature dependence of relaxation time is studied...
Thermogravimetric, X-ray diffraction, Mössbauer, dielectric, and electrical studies were performed on ceramic samples of the CuCrO2 phase with the delafossite structure synthesized by the method of solid-phase reactions. The effect of electric-field threshold switching of the studied samples from a high-resistance to a low-resistance state, which occurs in the temperature range of 170–200 K...
We investigate the equations of motion for a free point string on five-dimensional Sasaki-Einstein manifolds Yp,q/Lp,q,r. This results in Fuchsian equations with four singularities or a Heun equations. The asymptotic solutions of these equations are obtained through isomondromic deformation and are related to the sixth Painlevé equation. We derive the flows generated by the coalescence...
Hydrogels are three-dimensional cross-linked structures capable of absorbing significant amounts of water, water solutions, and biological liquids without dissolving or losing their structural integrity. The main goal of this work was to describe the kinetics of non-isothermal dehydration of poly(acrylic acid)-g-gelatin (PAAG) hydrogel, swollen in distilled water to different swelling degrees,...
As quantum chromodynamics (QCD) does not work in non-perturbative regime that dominates in hadron collisions, one could use the approach of quark–gluon (color) string model to quantitatively describe soft processes of multi-particle production. For instance, study the mechanism of string fragmentation and particles sources interaction by looking at different correlations between produced...
We study deuteron charge radius in the framework a hard-wall AdS/QCD model. We present basic elements of the hard-wall model, write metric for the AdS space. We introduce a vector field with twist $\tau=6$ describing deuteron in the bulk of AdS space and other vector field to describe photon respectively, write an effective action for the bulk fields interactions, find a $G_1(Q^2)$, $G_2(Q^2)$...
The commissioning of an all-around Construction Management information System (CMIS) was recently completed as a joint effort of two JINR Laboratories (LHEP and LIT). The system is particularly useful for the fine-grained control and continuous feedback of the production of complex multipart objects like the detectors subsys- tems composing the MPD and BM@N experiments of the NICA facility at...
The background induced by misidentification of a jet as a photon is usually estimated using two-dimensional sideband method (ABCD-method). This report is devoted to an alternative approach to the estimation based on maximum likelihood method which doesn't require the optimization of ABCD regions boundaries, which results in much faster estimation. This method has not been applied to the...
The simplest photonuclear reaction (γ,n) usually takes place through the well-known mechanism of giant dipole resonance. For a large number of stable nuclei, the energy differential cross-section of this reaction has been successfully measured. The experimental evidence for the (γ,2n) reaction is much poorer, while for reactions where three or more neutrons are emitted (usually denoted by...
Positron Annihilation Lifetime Spectroscopy (PALS) technique enables atomic-scale investigation of a wide range of phenomena and material characteristics. It is based on measuring the time interval between positron production and annihilation and reflects the characteristics of the environment in which the annihilation takes place. The timing resolution of the PALS spectrometer is...
The condition database of the BM@N experiment, the first experiment of the NICA megaproject, is used as a central location for storing vital experiment metadata, including session and run information, detector and subsystem parameters, and description of simulated event files. For an effective work with the database in the existing software environment, a set of various tools and services are...
The CBM experiment for the study of strongly interacting nuclear matter is currently under construction at the FAIR accelerator complex. As a demonstration experiment to check the performance of all detector systems of the CBM experiment, the mCBM experiment was launched within the framework of the FAIR Phase-0 program. One of the modules of the PSD hadron calorimeter (mPSD), equipped with the...
Our work concentrates on studying the Compton scattering kinematics of annihilation photons in different polarization states. Pairs of entangled annihilation photons with mutually orthogonal polarization are produced in positron-electron annihilation in a radioactive source. The Compton scattering of such photons is accurately theoretically and experimentally studied. In contrast, the...
104Rh nuclei was studied using the (nth,2γ) reaction. Measurements with two HPGe detectors for the 104Rh nuclei was conducted at the PGAA facility of the Centre for Energy Research (MTA EK), Budapest, Hungary. The obtained data is based on the analysis of the two-step gamma cascades in the mentioned compound nucleus to the final and some of the lower lying excited levels. The obtained primary...
The PAMELA electromagnetic calorimeter consists of 44 single-sided silicon sensor planes interleaved with 22 plates of tungsten absorber. It provides a comprehensive information about spatial development of hadronic showers, and about deposited energy amount.
In this work, Monte Carlo simulations (based on Geant4) performed using different available models, including Fritiof (FTF) and Quark...
The SRC experiment searches for short-period two-nucleon correlations using the detector subsystems of the BM@N facility. Successful experiments of this kind require an easy-to-operate, reliable system for controlling and monitoring the slowly changing parameters of the experimental hardware. Slowly changing parameters of experimental hardware that require constant monitoring are high and low...
Multinucleon transfer (MNT) reactions are known as possible access to neutron-rich isotopes of heavy and superheavy nuclei, but their application in experiments is complicated by a broad angular distribution of emitted products. A new superconducting solenoid GASSOL is being designed in FLNR JINR, the main purpose of which is an investigation of the chemical properties of superheavy elements....
Execution of one computing job demonstrates that software is correctly working. But, when the same job has to be executed thousands of times, it may cause different issues. Nowadays special distributed heterogeneous computing infrastructures are widely used for this type or workload. Main issue when running big workloads on them is network limits. These limits may be imposed in different...
The method of induced activity was used to study photonuclear reactions on a natural mixture of strontium isotopes. The experiment was performed on a bremsstrahlung of the RM-55 electron accelerator at an electron energy of 55 MeV. A brake target made of tungsten was used. Between the brake target with strontium target was placed copper monitor. During irradiation the electron current of the...
One of the tasks of the JINR organizational activity is to conduct excursions in the Institute's laboratories for different types of target audience and age groups. The organization of each excursion goes through a number of steps related to negotiation of excursion time, availabiolity of the facility and the guide. All negotiation were carried out through telephone and email conversations...
Genomics is a rapidly developing research area that studies genome structure, mechanisms of its functioning and genome and genes evolution. One of the key mechanisms of novel gene emergence is gene duplication. These events lead to the emergence of a gene with identical functions that can be lost, can change, or novel functions may be acquired. An example of genes that have evolved following...
The object of our research is a Fe3O4-SiO2-Au nanoparticles. The electron microscopy study showed that the nanoparticles had a core-shell structure. The average size of the magnetite core was 227±7 nm, the thickness of the protective shell made of SiO2 was 2 nm, the average size of gold nanoparticles covering the core was 16±0.6 nm.
To estimate the output of secondary electromagnetic...
Particlelike solutions can be configurated in SU(3) Yang-Mills theory with color electric and magnetic fields created by a nonlinear spinor field. Then it can be shown that the electric field expresses the Coulomb asymptotic behavior, whereas one of color components of the magnetic field behaves asymptotically like the field of a magnetic dipole. Therefore the corresponding charge and magnetic...
The one of the main aim for new multi-energy X-ray tomograph development based on the Widepix detector is materials decomposition. The Widepix detector is one of the Medipix family pixelated semiconductor hybrid detectors developed in Medipix collaboration. This detector has a high intrinsic spatial resolution and detecting radiation capable for wide energy range. It make possible to use...
Determination of uranium by the INAA method was carried out with by a neutron activation unit. The unit was developed in the Institute of Chemistry of the Far Eastern Branch of the Russian Academy of Sciences, Vladivostok city. A 252Cf radioisotope source (type NK252M11) with a total neutron flux of 109 s-1 was used as a neutron source. Plexiglass was used as a moderator. It has been providing...
We consider thermodynamics of system of symmetric quantum rigid rotors that rotates with constant angular velocity. We show the free energy of the system is given by the sum of translational and rotational contributions. The rotational free energy is computed as the function of temperature and angular velocity. The angular velocity corrections to the thermodynamic potential are identified in...
The first results of scientific cooperation between Cuban and the Joint Institute for Nuclear Research (JINR) of Russian Federation researchers in the application of ion beam analysis (IBA) methods are presented. PIXE and RBS measurements were carried out at the EG-5 accelerator facilities of the Frank Laboratory of Neutron Physics (FLNP)/JINR, contributing this way to the characterization of...
Efficient cleaning of contaminated water by photocatalysis has become an effective strategy in recent years due to its environmental and ecological designation. The cadmium sulfate (CdS) composition was modified with dopants including gadolinium oxide (Gd2O3) and combined with graphene oxide (GO) nanoparticles. The obtained powdered compositions are pristine Gd2O3, CdS/Gd2O3 and CdS/Gd2O3@GO....
The SCAN-3 spectrometer has been upgraded to three-arm configuration. New arm added to spectrometer in 2022. Arm are presented setup of six multilayer neutron detectors orientated under 90 degree to another arms. The main aim of additional arm is determination of background components of the studied processes with the registration of correlated pairs by TOF method. The status of readiness to...
