Physics of Atomic Nuclei最新文献_第4页

Developing the DECRIS-5M ECR Ion Source for the DC-140 Cyclotron Complex

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824100405

D. K. Pugachev, S. L. Bogomolov, A. E. Bondarchenko, K. I. Berestov, K. I. Kuzmenkov, V. N. Loginov, A. N. Lebedev, V. E. Mironov, D. S. Podoinikov

引用次数: 0

Methodology of Nuclear Research Reactor Conversion at the Decommissioning Stage

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S106377882410003X

D. Yu. Baidarov, T. V. Boykova, Yu. O. Kochnov, N. N. Safronova, I. A. Tutnov

{"title":"Methodology of Nuclear Research Reactor Conversion at the Decommissioning Stage","authors":"D. Yu. Baidarov, T. V. Boykova, Yu. O. Kochnov, N. N. Safronova, I. A. Tutnov","doi":"10.1134/S106377882410003X","DOIUrl":"10.1134/S106377882410003X","url":null,"abstract":"The authors consider the creation of scientific and technical programs for conversion of nuclear research reactors at the decommissioning stage in terms of extending the designated service life of all operating nuclear research reactors (RRs) in Russia. To solve this problem, a methodology is proposed that includes an information model and a description of the necessary step-by-step actions, along with a set of appendices in the form of documents describing the best ways of creating a project for managing the quality of RR conversion in relation to special conditions of the life cycles of specific nuclear reactors. The methodology is described in the form of principles and means of construction and structure. An example of applying this methodology to the conversion of the Hydra salt solution pulse nuclear research reactor at the stage of decommissioning is presented. The reason for converting the Hydra reactor is to extend the designated service life by replacing nonrepairable equipment (the vessel). The main criteria for confirming the remaining service life of the vessel are formulated. They include the safety margin of the vessel’s material with allowance for the fluence accumulated on the more vulnerable areas and confirming the integrity and tightness of the vessel. For clarity, the conceptual information model of the methodology for confirming the safety of replacing the Hydra reactor vessel is given in the form of an Ishikawa diagram. The methodology consists of a number of consecutive scientific and technical activities, studies, and a finite number of actions in order to achieve the ultimate goal of extending the service life. The stages of the methodology for confirming the safety of replacing the Hydra reactor vessel are described. These include clarifying the initial data, performing computational studies and laboratory experiments, clarifying the requirements of methodological documentation, creating a working plan, and preparing license documents of operation.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 10","pages":"1540 - 1547"},"PeriodicalIF":0.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical-Experimental Substantiation of the Operability of Localizing Safety System Element Seals of WWER Power Units

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824100235

S. B. Kravets, S. A. Kuzin, V. M. Sapelnikov, S. E. Sinelshchikova, A. A. Povolotskaya, V. G. Beketov

{"title":"Analytical-Experimental Substantiation of the Operability of Localizing Safety System Element Seals of WWER Power Units","authors":"S. B. Kravets, S. A. Kuzin, V. M. Sapelnikov, S. E. Sinelshchikova, A. A. Povolotskaya, V. G. Beketov","doi":"10.1134/S1063778824100235","DOIUrl":"10.1134/S1063778824100235","url":null,"abstract":"The relevance of this work is determined by the need to predict the operation of seal assemblies for localizing safety system (LSS) elements of WWER power units, which include penetrations, hatches, airlocks, doors, and other elements of the sealed enclosure (SE) in operating modes. Operating modes are understood as normal operation modes, abnormal conditions, and emergency situations. During the manufacture and operation of LSS elements, the problem arises of uneven protrusion of a two-row rubber gasket from the grooves in the LSS element web, which leads to the need to clarify the integral compression force of the seal as a whole for this element. The problem is caused by the imperfection of the technology for manufacturing large webs for LSS elements (doors, hatches, and airlocks: the perimeter of the seals can reach 10–20 m, the web diameter is 2–6 m) and the need to maintain strict technological requirements for flatness, parallelism, and tolerance extremes in linear and angular dimensions. The manufacture of large structures is complicated by the presence of welded joints, heat treatment, and the complexity of metalworking. The compression force of the PNAE-7-002-86 rubber gasket is not regulated; therefore, for the reliable design of seal compression mechanisms, the magnitude of this force is determined. Based on the results of rubber gasket tests for tightness and cyclic loading, an assessment of the tightness of the used rubber gaskets has been performed and calculations of the rubber gasket deformations have been performed using the FEM software package. Recommendations have been developed to increase the reliability of seal assemblies for LSS elements of WWER power units in operating modes and to select the compression for the required force to provide tightness at the commencement of operation and after 5000 open/close cycles.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 10","pages":"1387 - 1393"},"PeriodicalIF":0.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Method for Calculating Spatial Resolution of Heavy Ion Beam Probing for the T-15MD Tokamak

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824090035

Y. M. Ammosov, O. D. Krokhalev, L. G. Eliseev, G. A. Sarancha, A. V. Melnikov

引用次数: 0

High-Temperature Interaction of Triuranium Disilicide with Ceramics and Refractory Materials

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824090357

V. E. Rukosuev, A. V. Tenyshev, A. V. Lysikov, L. A. Karpyuk, D. P. Shornykov, E. N. Mikheev, V. V. Novikov, R. B. Sivov, G. A. Ivanov, A. S. Bykanov

{"title":"High-Temperature Interaction of Triuranium Disilicide with Ceramics and Refractory Materials","authors":"V. E. Rukosuev, A. V. Tenyshev, A. V. Lysikov, L. A. Karpyuk, D. P. Shornykov, E. N. Mikheev, V. V. Novikov, R. B. Sivov, G. A. Ivanov, A. S. Bykanov","doi":"10.1134/S1063778824090357","DOIUrl":"10.1134/S1063778824090357","url":null,"abstract":"The high-temperature interaction of triuranium disilicide U3Si2 with BeO, Y2O3, Al2O3, ZrO2, Mo, and Ta has been considered. The formation of eutectics in these systems has been analyzed theoretically, and experiments on heating samples of triuranium disilicide located on substrates of appropriate materials in vacuum to a temperature of 1500°С have been carried out. The result shows the absence of interaction between U3Si2 with BeO, Y2O3, ZrO2, and Mo. The formation of eutectic in the U3Si2–Al2O3 system has been experimentally confirmed. In addition, the strong interaction of U3Si2 with Ta with the formation of diffusion layers has been revealed. The possibility of using the materials under study in contact with triuranium disilicide at high temperatures is concluded.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 10","pages":"1410 - 1415"},"PeriodicalIF":0.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Calculation of the Emission Characteristics of Thermally Nonequilibrium CO2 Gas in the Range of 3200–5400 cm–1 Using the Line-by-Line and Statistical Narrow-Band Models

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824090217

A. M. Molchanov, D. S. Yanyshev, L. V. Bykov, A. S. Kovalenko

引用次数: 0

An Assessment of the Influence of the Technogenic Acoustic Background on γ -Spectrometer Readings during Registration of γ-Radiation Spectra

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824100119

A. P. Elokhin, S. E. Ulin, A. I. Majidov, A. E. Shustov

{"title":"An Assessment of the Influence of the Technogenic Acoustic Background on γ -Spectrometer Readings during Registration of γ-Radiation Spectra","authors":"A. P. Elokhin, S. E. Ulin, A. I. Majidov, A. E. Shustov","doi":"10.1134/S1063778824100119","DOIUrl":"10.1134/S1063778824100119","url":null,"abstract":"This paper presents theoretical and experimental data determining the effect of acoustic perturbation on the readings of a γ-detector with high-pressure xenon gas as a working medium (XGS) operating in the field of IR. For this purpose, a chain of events is considered: an acoustic wave falls on the surface of the XGS, passes through and produces a perturbation in the gas which forms a nonuniform pressure distribution in the working medium. Exposure to IR leads to the formation of positive ions in the gas, the mobility of which is much lower than the mobility of free electrons, which are the main carriers in XGS. The experiments are carried out using an unmanned BDK dosimetric complex with a carrier in the form of a helicopter-type UAV on which dosimetric equipment used for radiation control of the environment in conditions of its radioactive contamination is attached. Theoretical results obtained by solving the wave equation of sound wave passage in xenon filling the XGS are presented in the form of xenon density. These data allow us to obtain the radial distribution of the current density at different moments of the harmonic acoustic oscillation period. Experimental data demonstrated frequency characteristics of acoustic load and their amplitudes in different modes of UAV operation. The results of the research determine the recommendations that should be taken into account when using UAVs as carriers of dosimetric equipment in radiation monitoring of the environment.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 10","pages":"1529 - 1539"},"PeriodicalIF":0.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

What is the Thickness of the Ice Melting Front?

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824090400

I. S. Stepanov, L. I. Budaeva, O. A. Raznitsyn, M. V. Karpov, S. V. Stepanov

{"title":"What is the Thickness of the Ice Melting Front?","authors":"I. S. Stepanov, L. I. Budaeva, O. A. Raznitsyn, M. V. Karpov, S. V. Stepanov","doi":"10.1134/S1063778824090400","DOIUrl":"10.1134/S1063778824090400","url":null,"abstract":"The melting front thickness of ice has been estimated from the measured kinetics of the melting of ice balls in air at room temperature (≈22°C) and in cooled water (( lesssim 1^circ {text{C}})) taking into account the temperature of the ice ball surface and the bulk temperature inside the balls. In both cases, the input heat is absorbed by ice in the form of the latent heat of fusion within the layer called the melting front. In order to describe the kinetics of the ice ball melting, we have developed a model with allowance for the heat transfer through the entire surface of the ice ball, which decreases during melting. The measured temperatures of the ice surface and the temperature inside the balls are approximately 0.4 and 0°C, respectively. The ice melting kinetics in cold water has been determined by means of the continuous measurement of the weight of the submerged ice ball (containing a lead ball frozen inside) as a function of time. In both cases (melting in air and water), the thickness of the ice melting front estimated from the fit the proposed model of experimental data is approximately 3 mm.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 10","pages":"1483 - 1492"},"PeriodicalIF":0.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating the Magnetic Properties of Strontium Hexagonal Ferrite Nanoparticles

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824100223

A. I. Kovalev, E. A. Belaya, D. A. Vinnik, D. A. Zherebtsov, A. M. Kolmogortsev

{"title":"Investigating the Magnetic Properties of Strontium Hexagonal Ferrite Nanoparticles","authors":"A. I. Kovalev, E. A. Belaya, D. A. Vinnik, D. A. Zherebtsov, A. M. Kolmogortsev","doi":"10.1134/S1063778824100223","DOIUrl":"10.1134/S1063778824100223","url":null,"abstract":"Strontium hexaferrite with the formula SrFe12O19 is prepared using citrate technology. A feature of this synthesis is a relatively low production temperature of 700°C. X-ray diffraction study reveals the single-phase state of the resulting material, due to the full correspondence of the positions of the diffraction maxima on the experimental XRD pattern and the positions on the reference XRD pattern of strontium hexaferrite from the ICDD database. A SEM image of the sample at a magnification of 50 000 testifies to the nanodispersed state of strontium hexaferrite particles. DSC reveals a Curie point of 450.9°C. Analysis of the hysteresis loops at 300 and 50 K indicates a magnetically hard material in a single-domain state and the growth of magnetic parameters at low temperatures, which slows upon cooling to 100 K. Studies are performed on a Rigaku Ultima IV diffractometer with CuKα radiation and a scanning speed of 2°/min, a JEOL JSM-7001F electron microscope with an EDS Oxford INCA X-max 80 energy-dispersive spectrometer, a Netzsch STA449C F1 Jupiter thermal analyzer upon heating to 600°C at a rate of 10°С/min in air, and a Quantum Design PPMS VersaLab vibrating magnetometer at temperatures of 300 and 50 K with an applied magnetic field of up to 3 T.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 10","pages":"1416 - 1420"},"PeriodicalIF":0.3,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extraction of a Proton Beam of Variable Intensity from the U-70 Accelerator Using Bent Crystals

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-19 DOI: 10.1134/S1063778824090291

S. F. Reshetnikov, A. G. Afonin, E. V. Barnov, A. N. Vasiliev, V. A. Maisheev, V. V. Mochalov, P. A. Semenov, Yu. A. Chesnokov

引用次数: 0