DsTau (NA65) at the CERN-SPS is a recently approved experiment, which aims to study the tau neutrino production. The main source of tau neutrinos is the decay of Ds mesons, namely Ds → τντ and then τ → ντX. There is almost no data on the differential production cross section of Ds in proton-nucleus interactions, which leads to a large uncertainty of tau neutrino cross section measurements...
The main goal of the NA62 experiment at CERN is to measure the probability of the ultra-rare $K^+$ → $π^+vv$ decay. The collected statistics for 2016-2018 years allow us to analyze other rare decays, in particular, $K^+→e^+vµ^+µ^-$. Since the inner bremsstrahlung (IB) for $K^+→e^+vµ^+µ^-$ decay is suppressed (0.03%), this decay is well suited for measuring form factors ($F_V$, $F_A$, and R)....
In this paper, we study the angular features of the signal and background processes of the associated production of the Higgs boson with W-boson. Signal and background processes are generated using the CompHEP, POWHEG and PYTHIA generators. Monte Carlo data is processed in ROOT software. We also compared the shape of the distribution of kinematic variables obtained from different generators....
The results of measurements of angular coefficients for Z bosons produced in pp collisions and decaying to mu+mu- are presented. The data collected by the CMS detector during the LHC Run-I and Run-II was used.
We have made a three-loop quark model calculation of the W-exchange contribution to the nonleptonic two-body decays of the doubly charmed baryons Ξ_cc and Ω_cc. The W-exchange contributions appear in addition to the factorizable tree graph contributions and are not suppressed in general. We make use of the covariant confined quark model previously developed by us to calculate the tree graph...
Analyzing power of the elastic proton-proton scattering was obtained at the Nuclotron Internal Target Station using a polarized deuteron beam and a polyethylene target. The asymmetry on hydrogen was obtained by the subtraction of the carbon background. The final selection of useful events was performed using time and amplitude information from scintillation counters. The obtained analyzing...
We present the branching fractions for the rare semileptonic decay $B \to \omega \ell^+ \ell^-$ for $\ell = e, \mu, \tau$. The necessary transition form factors are computed in the entire range of momentum transfer within the Standard Model framework of Covariant Confined Quark Model with built-in infrared confinement. We further compute different physical observables such as forward backward...
The evaluation of the performance of computing resources is important for workload distribution and workload planning. It is usually done with standard benchmark tools. The most well-known benchmark in grid infrastructures in High Energy Physic is HEP-SPEC06. This benchmark is based on industrial benchmark SPEC06. Running of HEP-SPEC06 takes a substantial amount of time but gives a precise...
Terrestrial Gamma-ray Flashes (TGF) - short (~ 100 μs) and intense flashes of terrestrial gamma radiation, the source of which is thunderstorms. This remarkable natural phenomenon has been observed for over 20 years by satellites (for example, Fermi), as well as by ground-based observatories (for example, the Array telescope).
It is believed that the source of gamma radiation is avalanches of...
In ultrarelativistic heavy-ion collision (NICA, FAIR, etc.) the creation of quark-gluon plasma with a nonzero angular momentum is expected, especially in off-central collision. The rotation of QCD matter shoud leads to a number of nontrivial physical phenomena, and further study of rotation is of a great interest. In this work the influence of the rotation on the confinement/deconfinement...
Currently, there is a significant increase in the number of sources of scientific and technical information on the Internet, which complicates its high-quality processing by scientists. At the same time, the use of cloud computing environments is gaining popularity in organizations.
The Joint Institute for Nuclear Research (JINR) has its own cloud computing environment developed by the...
This report is devoted to lattice study of QCD equation of state (EoS) at finite baryon chemical potential and nonzero magnetic field. The simulations are performed with rooted dynamical staggered $u$, $d$, and $s$ quarks at physical quark masses. In view of the sign problem, the study is carried out at imaginary chemical potential. The results are analytically continued to real chemical...
We study Hamiltonian form of unfree gauge symmetry where the gauge parameters have to obey differential equations. The phenomenon of the unfree gauge symmetry is clarified from viewpoint of involution relations between Hamiltonian and constraints. Given the involution relations for the first-class constraints of all generations, we provide explicit formulas for unfree gauge transformations in...
Inter-disciplinary research and open data access are big trends in modern science. Globalization facilitates the exchange of experiences and ideas between different domains of knowledge, and allows us to expand the horizons of our understanding of the processes taking place in nature and society. To make this happen, aggregated data access systems are being established to link together...
In this talk we are going to discuss recent results on non-Abelian vortex strings in four-dimensional (4D) $\mathcal{N} = 2$ supersymmetric QCD with U$(N=2)$ gauge group and $N_f=4$ flavors of quark hypermultiplets.
It has been recently shown that these vortices behave as critical superstrings. The spectrum of closed string states in the associated string theory was found and interpreted...
In my talk, I'll briefly describe recent results in the field of calculation of multi-loop and phase-space integrals arising in many QFT problems. Included problems with various masses and scales in different space-time dimensions. We give a review of modern methods and calculation setups needed for performing such complicated problems with available computer resources.
At present, in Dubna, Russia a new acceleration complex NICA is approaching final stages of its construction. At collider, there will we two major detectors, one of them, Multi-Purpose Detector (MPD), is going to be used for studying properties of dense baryonic matter. One of the most important parts of MPD is Forward Hadron Calorimeter (FHCal). FHCal will consist of two arms: left and right,...
The report presents the status of work on the joint project of LIT and BLTP on the creation of a virtual research environment for studying Josephson junctions with magnetic systems. The virtual research environment (VRE) is designed to provide research groups with convenient tools for carrying out the entire research cycle: from building models, setting model parameters, both physical and...
Although the Standard Model (SM) has become the main theory that describes modern Particle Physics, it fails to answer a number of questions. The most famous of «problems beyond the SM» is the origin of neutrino mass, while SM considers only left massless neutrinos.
To explain «problems beyond the SM», it is necessary to introduce new particles and interactions, which haven't yet been...
The paper presents measurements of the noise characteristic of SiPM in the temperature range from 27.7 °C to 39.1 °C, as well as study of the response of the detector prototypes Ketek and Hamamatsu with SiPM readout to the LED at different voltages. The prototype with SiPM readout from Ketek was tested on the JINR Nuclotron deuteron beam at the energy of 4 GeV/nucleon. Time resolution and...
The Multi-Purpose Detector (MPD) being currently developed in the High Energy Physics Laboratory, will allow observations of particles created in heavy ion collisions. One of the most important systems of the MPD which is going to be used in identification of these particles is gaseous Time-of-Flight detector, based on the mRPC (Multi Resistive Plate Chambers) technology. To the formation of...
One of the uppermost tasks in creating a computing system of the NICA complex is predictive modeling centers of storing and processing data from experimental setups of the complex, in particular, the BM@N detectors, and simulated events of particles collision for comparison with the expected physical result and optimization of the facility detectors geometry.
A new approach was chosen to...
Joint Institute for Nuclear Research hosts more than 40 international conferences every year. Organization means providing information about the event, registration page, abstract submission, timetable creation, and other important information. To do that, the Indico system is used heavily.
Indico is open-source software for meetings organization developed and supported by CERN. One of the...
The measurement of Short-Range Correlations (SRC) at Baryonic Matter at Nuclotron (BM@N) for the first time provides information on the nucleus properties after interaction. The coordinate and time detectors located upstream and downstream the analyzing magnet make it possible to determine the charge-to-mass ratio for each fragment.
The total charge in the event is measured by the...
We have introduced the Plant Disease Detection Platform (PDDP) which allows users to send photos of sick plant leaves or textual descriptions of theirappearance to obtain the information about an infection that hit the vegetation and treatment tips. The backend of the platform in terms of deep learning includes image classification model and text similarity model. The image classification...
BM@N (Baryonic Matter at Nuclotron) is a fixed target experiment at the NICA - Nuclotron accelerator complex (JINR). It is aimed at studies of nuclear – nuclear (up to gold-gold) collisions at high densities. The Nuclotron provides heavy ion beams with energies from 2.3 to 3.5 GeV, which is suitable for studies of strange mesons and multi–strange hyperons produced in nucleus-nucleus collisions...
In the proces of numerical calculations, one often encounters situation, when some computationally expensive function is called multiple times for the same set of input parameters. Proper caching of alreasy obtained values can speed-up the calculations. In my work I concentrate on case, when function of multiple parameters needs to be cached. In order to be able to find requested values...
The goal of the MPD experiment at NICA collider is to explore the QCD phase diagram of strongly interacting matter produced in nucleus-nucleus collisions at $\sqrt{s_{NN}}$=4-11 GeV in the region of high net baryon chemical potential and moderate temperatures. The anisotropic collective flow is one of the key observables sensitive both to the transport properties and equation of state of such...
The ability to store and recall information based on associations between objects is considered a characteristic trait of intelligent systems. In biological neural networks, learning is believed to take place at a synaptic level by modification of synaptic connections. In this project, we study the statistical physics of memory and learning through the Hopfield Model of Associative Memory. We...
In this study, LIT JINR is considered as an object of implementation of corporate GIS.
This information system is designed to optimize management decisions on the operation of the
LIT building based on the creation and maintenance of an up-to-date database on all aspects of
the functioning of the building infrastructure. The main goal of the introduction of CGIS in LIT
is the competent...
The program of the polarimeter upgrade at Internal target station at the Nuclotron are presented. The simulation of the pd-elastic and pp-elastic scattering for 500 - 1000 MeV proton energy is performed. First results of the proton polarization measurements are presented.
Collisions of $^{197}$Au nuclei with the center-of-mass energy $\sqrt{s_{NN}}$ from 4 to 11 GeV will be studied in the MPD (MultiPurpose Detector) experiment at NICA collider, which is presently under construction. In the BM@N experiment at the same facility nuclear beams interact with fixed targers. The NICA facility is designed for the investigations of baryon-rich strongly-interacting...
Periodic Pulsed research reactors IBR-2 type in Dubna is the most effective source of slow neutrons extracted beams for studying various structures by diffraction, small-angle scattering, reflectometer, inelastic scattering and neutron diffraction, due to a short neutron pulse and a high average flux of up to 10 E +14 cm-2 s-1. At the same time, due to the specificity of the kinetics,...
Effective studying of the nucleon spin structure in colliding polarized proton beams is possible with the pp collision luminosity L=1 10^32 cm^(-2) s^(-1) at the energy range of Ecm=27 GeV. Reaching of necessary level of the luminosity is connected with the accumulation of n=2 10^13 particles in each of the collider rings and solving the problems of stable beam dynamics. Building of an...
The BESIII experiment is a multi-purpose detector operating at the beams of the electron-positron collider BEPCII in Beijing. Particle tracking is a fundamental part of data analysis for this experiment. The inner part of the BESIII tracker suffers from a strong beam-related background, which significantly reduces tracking efficiency for low-pT tracks and the physics performance of the...
An issue of crew members’ health care is raised while planning long-term expeditionary space missions. It was determined that astronauts encounter an increased risk of developing bacterial infections, respiratory diseases, dermatoses and allergic reactions, gastrointestinal disorders, as well as reactivation of certain viruses during the flight to the ISS. This is in part the fact that the...
The track recognition process (tracking) plays a key role in the event reconstruction in high energy physics. Our study is devoted to tracking for the inner detector of the BES-III experiment, which has only three cylindrical GEM stations. This means, if a particle is registered only at two out of three stations, then its track in the magnetic field cannot be restored without additional...
High-order clustered DNA lesions is the hallmark of the action of dense-ionizing radiation. It is defined as a combination of two or more individual lesions (single-strand and double-strand breaks (DSB), base damage, etc.) located within 1-2 DNA helical turns. Clustered DNA DSBs, which contains DSB and other DNA lesions, represent specific interest for investigation.
For investigation of...
An overview of the tuned simulation of the drift chambers in the BM@N experiment is given. The comparison with experimental data is also presented.
The configuration of the basic detectors (Forward Si and GEM), included in the inner tracking system of the BM@N setup, has to be improved in order to be in compliance with requirements of the forthcoming experimental runs that will be held in 2021-2022. The preliminary estimation of geometric efficiency for the next configurations of tracking detectors is made with simulation procedure based...
DNA DSBs repair kinetics in neurons and astrocytes of primary hippocampal cell culture after irradiation with Co60 g-rays and proton
Abstract
The induction and repair of DNA double-strand breaks (DNA DSB) were analyzed in primary hippocampal cell culture under the action of Co60 g-rays or protons at 3 Gy dose. For investigation of DNA DSBs formation, we established two cell cultures:...
The article describes the experiments carried out up 2018 to 2019 at the accelerator complex DC-60 of Astana branch of the INP (Alma-Ata, Kazakhstan Republic), to develop methods for production of intense beams of metals with the use of volatile organometallic compounds (Metal Ions from Volatile Compounds) – MIVOC. As a result of performed work for the first time at DC-60 cyclotron a beams of...
Investigation of the effects of ionizing radiation on cells of the central nervous system is a challenging topic in modern radiation research, as well as treatment planning in radiation therapy and predicting the space radiation health risk for exploration cosmonauts. To contribute in understanding radiation damage mechanisms in complex morphology of brain cells, it is necessary to investigate...
The MPI/C++ /Fortran package of computer codes has been developed for high-performance numerical analysis of experimental data on elastic nucleus-nucleus scattering within a microscopic model of optical potential. In the package, a modified DWUCK4 Fortran-code for calculating the physical characteristics of elastic scattering based on a numerical solution of the corresponding Schrödinger...
Abstract
The subject/topic.
The article describes in detail the key parameters and the principle of the heavy ion beam loss diagnostic system operation. The article also provides a detailed description of the software required for collecting, storing and online visualization of data from this system.
Goals/Objectives.
The aim of the work is the development of the software for...
We present accurate numerical results for the one-dimensional stationary Schrödinger equation in the case of three quantum problems: quantum harmonic oscillator, radial Shrödinger equation for a Hydrogen atom, and a particle penetration through the potential barrier. All of them were solved by the Numerov method with high accuracy and we plot their wave functions using the results of the...
Sponges are one of the oldest multicellular animals that have survived almost unchanged to this day. The earliest finds of sponge remains date back 680 Ma. At the moment, the planet is inhabited by both marine and freshwater sponges. By the type of nutrition, all sponges are filter feeders, so they play an important role in aquatic ecosystems. At a certain moment events of mass diseases and...
The fragmentation of relativistic nuclei observed in its entirety only in nuclear emulsion (NTE) serves as a source of ensembles of the lightest nuclei of interest to cluster physics and astrophysics [1]. NTE allows one to study such ensembles in forward fragmentation cone with record spatial resolution and isotope identification of He and H fragments. Determination of the invariant mass of...
The aim of the deuteron spin structure (DSS) experiment is to obtain polarization observables in dp elastic scattering at large CMS angles (> $60^\circ$) and in dp breakup.
The dp breakup reaction has been investigated by the scintillation detectors placed at the vicinity of Internal Target Station (ITS) of Nuclotron. Data have been obtained at the angles of $19^\circ$ - $54^\circ$ in the...
Currently, the synthesis of new superheavy elements in nuclear fusion reactions requires long-term irradiations of actinide targets with high-intensity heavy ion-beams. For more intense ion beams construction of the Superheavy Element Factory (SHE Factory) of the Flerov Laboratory of Nuclear Reactions FLNR JINR, was recently completed and now it is fully operational. Whereas more intense ion...
In this work we obtain theoretical nuclear masses (or binding energy) and localize proton and neutron drip lines using method of local mass relations. This method demonstrates good applicability for atomic mass predictions [1, 2, 3]. For estimates we use an approximation of the formula that describes the residual np-interaction, the features of which were discussed in detail in the previous...
The properties and characteristics of light weakly bound atomic nuclei continue to attract interest against the background of the development of secondary beam accelerators. Many interesting features have been revealed in the He-6 and He-8 atomic nuclei such as halo, skin effects by [ I Tanihata][1]. It is quite obvious, and very clear, that their participation in direct nuclear reactions also...
Silicon nitride is one of the perspective ceramics for inert matrix fuel hosts to be used for transmutation of minor actinides. Such materials should have structural stability and appropriate mechanical properties being irradiating with neutrons, α-particles and fission products.
In this work we report on mechanical properties of polycrystalline Si3N4 irradiated with swift heavy ions...
One of the most actual problem at the physics of low-dimensional superconducting/ferromagnetic heterostructures is determination of the correlation between magnetic spatial profile and the spatial profiles of the elements at the interface between layers. Standard neutron reflectometry can’t be used to measure neutron interaction with separate element, in particular, magnetic field induction. A...
The wide range of technological applications of phosphate glasses enable them to occupy high rank in the science of glass. This is due to, the ease of network modification of the phosphate glasses via additive other modifiers character, low glass transition temperature, high thermal expansion coefficient, high electrical conductivity and very high transmission in the ultraviolet region. These...
With the increase of users of the HybriLIT heterogeneous platform, the development of new services for users remains the key task.
Today we have an environment of information services for users of the platform which help organize work in the system in a more efficient way.
This report presents a new developed and implemented service for the users of the HybriLIT platform.
In this work the Raman spectroscopy method was used to study the radiation damage and associated internal mechanical stresses in polycrystalline silicon nitride ($Si_3N_4$). $Si_3N_4$ samples have been irradiated with swift heavy Xe and Bi ions with energies of 167 and 710 MeV, respectively, in the range of fluences from 1E11 to 4.87E13 $ions/cm^2$. The spectra of the cross-section of the...
