In 2024, as part of the work on creating a new neutron source, a three-dimensional model was developed to calculate temperature fields in the fuel assemblies (FAs) of the operational IBR-2 reactor, enabling the study of thermomechanical processes that directly influence reactor dynamics. Three key dynamic processes were studied in detail: axial fuel expansion and pellet geometry changes due to...
Differential cross sections of the elastic and inelastic scattering of 14.1 MeV neutrons on carbon nuclei measured in the frame of the TANGRA project will be presented in the talk. The experiment was carried out using the tagged neutron method which helped to reduce the background of random coincidences, determine the neutron flux on the target, and determine the energy of scattered neutrons...
Periodic pulsed reactors were suggested for the first time by Dmitry Blokhintsev in nineteen-fifty-five. The new idea solved the problem of low neutron flux after choppers in constant power reactors to create neutron pulses for the time-of-flight method. And the problem of low flux needed to spectroscopy in aperiodic pulsed reactors. The maximum power of these reactors can reach to a very high...
This work presents the results of research carried out with the aim of conducting systematic studies of qualitative and quantitative patterns between the microstructure of electrode coatings and their specific characteristics. Information about the microstructure of coatings was obtained using small-angle thermal neutron scattering, which, due to the high penetrating power of this radiation,...
Copper (II) oxide (CuO) is a p-type semiconductor with a narrow bandgap of 1.21 to 1.55 eV, non-toxic, abundant in the Earth's crust and stable. These characteristics make the CuO a suitable material for applications in optoelectronic devices. The aim of this work is to study the possibility of extending the employment of this material in extraterrestrial or other environments under ions...
Various studies of archaeological samples have been carried out at the IBR-2 reactor for many years, using available methods and installations. Most of these experiments are conducted to determine the volume (neutron tomography) and structural (neutron diffraction) characteristics of samples. However, in connection with the modernization of the EPSILON installation on channel 7 (b) of the...
The systematic studies of composition and spatial distribution of main phases inside volume of twenty-five fragments of Byzantine ceramic obtained in archeological works in the Dobrudja region, Romania, have been performed using neutron diffraction and tomography, and Raman spectroscopy. To determine the mineral phase composition of the studied ceramics, we used the neutron diffraction method...
I will review the hydrodynamical approach to the description of the gravitational chiral anomaly in spacetimes with a non-trivial Ricci tensor proportional to the cosmological constant (so-called Einstein manifolds) and discuss an alternative derivation of the Unruh effect in curved spacetime as a non-trivial consequence of the hydrodynamical description of the axial current.
I will give a brief overview of the amazing theoretical phenomena that are observed in the N=2 supersymmetric higher spin theories. The talk is based on the results obtained in BLTP jointly with Professor E.A. Ivanov and Professor I.L. Buchbinder
Using an improved version of the Newman-Janis algorithm, we obtain metrics of rotating black holes for a set of extended gravity theories that extend general relativity in different ways: the Horndeski model, the bumblebee model, the Gauss-Bonnet scalar gravity, the loop quantum gravity, the conformal gravity, and $f(Q)$ (symmetric teleparallel gravity STEGR). The obtained metrics are used to...
To carry out experiments on the deuteron beam extracted from the Nuclotron (JINR, Dubna), both transverse and longitudinal polarization are required. At present, there is no experimentally tested solution for obtaining longitudinal polarization of deuterons for arbitrary beam energies. Any direction of deuteron polarization, including longitudinal, in the entire beam energy range can be...
Cryogenic systems are used to create and maintain extremely low temperatures across various fields, ranging from scientific experiments to industrial technologies. The use of cryogenic equipment is critical for the development of advanced materials and superconductors, as well as for the storage and transportation of biological materials. Cryogenic systems are also essential for the operation...
The report will present an overview of the work done by students under the author's supervision. During the author's work at LHEP, more than 10 students completed their diploma theses devoted to solving problems on the NICA complex. The features of working with students and the contribution of their work to the NICA complex will be shown. Доклад представит обзор работ, выполненных студентами...
Electron cooling is a method of reducing momentum spread of ion beams in synchrotrons. The mechanism of electron cooling is based on temperature exchange between circulating ions and a cold electron beam coming from an electron gun and then accelerated to the same velocity as ions. For small ion density the equilibrium temperature of the ion beam is set by effective temperature of electrons....
There are two tasks require the use of pulse mode HTS (high-temperature superconducting) magnets at the NICA accelerator complex. The first is a 3 MJ inductive energy storage device SMES in the Booster and Nuclotron power supply system, the solenoid has a diameter and height of just under a meter and it will be manufactured in the 25th. And there is the task at the R&D stage is the development...
NICA SMES – индуктивный накопитель энергии, изготавливаемый в ЛФВЭ ОИЯИ для уменьшения: пульсаций в рабочем токе сверхпроводящих магнитов Бустера и Нуклотрона NICA, влияния индуктивной нагрузки сверхпроводящих синхротронов на городскую электрическую сеть, потребления электроэнергии. Основным элементом SMES является многослойный соленоид из высокотемпературного сверхпроводящего (ВТСП) кабеля....
This paper presents a software-hardware complex for measuring the tension of the anode wire in drift tubes used in the SPD experiment's straw tracker at the NICA collider. The tension of the anode wire is critical for ensuring the accuracy of coordinate determination, as it affects electrical stability and the positioning of the wire due to electrostatic and gravitational forces. The developed...
Низкоэнергетический поляриметр (LEP) является первым из трех поляриметров поляризованных пучков на ускорительном комплексе NUCLOTRON. Этот поляриметр расположен за линейным ускорителем Lu-20. Его рабочая энергия составляет 5 МэВ на нуклон. Газовая мишень 3He этой установки позволяет измерять как векторную поляризацию протонов (с реакцией упругого рассеяния 3He(p,p)3He), так и векторную и...
Big modern physics experiments represent a collaboration of workgroups and require wide variety of different electronic equipment. Besides trigger electronics or Data acquisition system (DAQ), there is a hardware that is not time-critical, and can be run at a low priority. Slow Control system are used for setup and monitoring such hardware. Slow Control systems in a typical experiment are...
Представлена реализация устройства на основе интерфейса JTAG и микросхем размножения синхросигналов. Устройство предназначено для реконфигурирования, отладки, тестирования и синхронизации 62 карт накамерной электроники и одного контроллера системы сбора данных детектора TPC/MPD проекта NICA. Отражен текущий статус устройства.
The report is a short review of process of pp-collision data at the LHC. Most of it is devoted to monitoring aspects as well as the contribution of JINR collaborators to it.
BM@N is the first operating fix-target experiment at the NICA collider facility at JINR. BM@N is using ion beams from the Nuclotron accelerator ring to study the properties of cold dense baryonic matter. In 2017 the physics program of BM@N was enriched by studies of Short-Range Correlations (SRC) in carbon nuclei. SRC are specific nucleon configurations, where nucleons are separated by a...
The 2022 SRC run aims on measurement of the scattering of 3.7 GeV/c/u 12C ions from hydrogen in inverse quasi-free kinematics. The ground-state distribution of single nucleons in the p-shell of 12C is studied by detecting two protons at large angles in coincidence with an intact 11B nucleus. The nuclear fragments produced in the collision and emitted at small angles (≤ 1 deg) , with respect to...
The Quantum ChromoDynamics (QCD) phase diagram, often represented using coordinates of temperature (T) and baryonic chemical potential ($\mu_B$), includes a transition from a hadronic gas phase to a quark-gluon plasma (QGP) phase. The Beam Energy Scan (BES) program at Relativistic Heavy Ion Collider (RHIC) varies the gold-gold collision energy aiming to explore the phase diagram and pinpoint...
The discovery of atomic Bose-Einstein condensation (BEC) has prompted investigations into its potential manifestation in nuclear systems. The concept of α-conjugate nuclei, such as ¹²C, ¹⁶O, and ²⁰Ne, as ensembles of α particles has been proposed, though it represents a simplified model. Extensive studies have demonstrated that α clustering plays a fundamental role in the structure of light...
Semiconductor pixelated detectors are expanding their applications in different fields: high-energy physics, medicine, environmental radiation monitoring etc. This class of detector has a high signal recording speed and, thanks to this, allows for the registration of every single photon at a sufficiently high flux. To achieve a good energy resolution of the detector of this class, the...
In the first phase of the Spin Physics Detector (SPD) experiment, the main tracking system will be complemented by a Micromegas-based central tracker. The Micromegas Central Tracker (MCT) will improve pulse resolution and tracking efficiency during the first years of SPD operation. The performance of these detectors in a magnetic field is influenced by the gas mixture used. The results of...
In spring 2025, the 9th data-taking run is scheduled for the BM@N experiment. Since February 2023, when data from the 8th run were acquired, the BM@N data processing has been carried out using a geographically distributed heterogeneous infrastructure based on the DIRAC Interware software. For the 9th run, an automated task-launching methodology has been developed. The processing is triggered...
В Институте накоплен значительный опыт разработки детекторных и ускорительных систем, соответствующего оборудования и сотрудничества с промышленными и научными партнёрами. Однако отсутствие централизованной базы знаний затрудняло поиск информации о существующих технологиях, компетенциях и поставщиках, что приводило к ограниченному обмену опытом между подразделениями. Для решения этой задачи...
Рассмотрим примеры удачных и неудачных кадров, снятых людьми-непрофессионалами в видеосъемке, поймём, что можно улучшить, и научимся не допускать подобные ошибки в своих видеосъемках.
The study of nucleon transfer reactions is an important field of heavy-ion physics, because such reactions provide the possibility of producing new exotic nuclei. Theoretical studies of the mechanisms of nucleon transfer are of great importance for planning and conducting experiments aimed at the production of neutron-rich nuclei located at the boundary of neutron stability [1]. In this work,...
Современные прецизионные эксперименты в области ядерной физики требуют ионных пучков высокого качества. Это утверждение справедливо как для первичных пучков, ускоренных на циклотроне, так и для вторичных пучков, полученных в результате ядерной реакции. В данной работе содержится информация о новой установке под названием Криогенная газовая ячейка охлаждения ионов или Газкэтчер в лаборатории...
Проблема обращения с радиоактивными отходами — одна из ключевых, от решения которой зависит дальнейшее развитие атомной энергетики и промышленности. Жидкие радиоактивные отходы (ЖРО) представляют наибольшую экологическую опасность из-за большого объёма, высокой суммарной активности и возможности неконтролируемого распространения.
In the world, many studies have focused on the natural radioactivity in agricultural soils and food crops and the transfers of radionuclides between two components. However, the influence of longterm agricultural practices on the activity concentrations of radionuclides in the soils remains unclear. On the other hand, the soil-to-plant transfer factors of radionuclides for a specific plant...
