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Bulletin of the Russian Academy of Sciences: Physics最新文献

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Results from the Physical Startup of the Second Stage of the BR-K1M Nuclear Research Facility BR-K1M 核研究设施第二阶段的实际启动结果
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-28 DOI: 10.1134/S1062873824707451
I. M. Piskorskiy, A. V. Arapov, A. V. Danilov, A. A. Devyatkin, A. V. Zhirnov, I. A. Kirilin, N. A. Krasavin, A. Ye. Nikiforov, G. N. Pikulina, K. A. Savasichev, A. B. Sokolov, V. A. Yukhnevich
{"title":"Results from the Physical Startup of the Second Stage of the BR-K1M Nuclear Research Facility","authors":"I. M. Piskorskiy,&nbsp;A. V. Arapov,&nbsp;A. V. Danilov,&nbsp;A. A. Devyatkin,&nbsp;A. V. Zhirnov,&nbsp;I. A. Kirilin,&nbsp;N. A. Krasavin,&nbsp;A. Ye. Nikiforov,&nbsp;G. N. Pikulina,&nbsp;K. A. Savasichev,&nbsp;A. B. Sokolov,&nbsp;V. A. Yukhnevich","doi":"10.1134/S1062873824707451","DOIUrl":"10.1134/S1062873824707451","url":null,"abstract":"<p>Results from modernizing the BR-K1M nuclear research facility (a cascade-type booster reactor) are presented. Research performed at the startup of the facility’s second stage is discussed, and the measuring and processing techniques used to obtain the main characteristics of the reactor core, the operating parameters, and the limit values for the facility’s safe operation are described.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 8","pages":"1293 - 1299"},"PeriodicalIF":0.48,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Angular and Spin Distributions of Primary Fission Fragments 初级裂变碎片的角分布和自旋分布
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-28 DOI: 10.1134/S1062873824707396
S. G. Kadmensky, D. E. Lyubashevsky, A. A. Pisklyukov, D. A. Stepanov
{"title":"Angular and Spin Distributions of Primary Fission Fragments","authors":"S. G. Kadmensky,&nbsp;D. E. Lyubashevsky,&nbsp;A. A. Pisklyukov,&nbsp;D. A. Stepanov","doi":"10.1134/S1062873824707396","DOIUrl":"10.1134/S1062873824707396","url":null,"abstract":"<p>Theoretical approaches proposed by A. Bulgac et al. (Washington University, Seattle) and J. Randrup et al. (Lawrence Berkeley National Laboratory (LBNL)) for studying correlations of angles between the spins of double spontaneous fragments and low-energy fission fragments are considered and compared. The idea of J. Randrup’s theoretical team (Lawrence Berkeley National Laboratory (LBNL)) on 2D and 3D spin is analyzed. Angular distributions for actinide nuclei <span>({}^{{232}}{text{Th}}(n,f),,,{}^{{252}}{text{Cf}}(sf),,,{}^{{238}}{text{U}}(n,f))</span> are derived with allowance for the special geometry of fissioning nuclei (2D) and compared to results from A. Bulgac et al. (Washington University, Seattle).</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 8","pages":"1256 - 1261"},"PeriodicalIF":0.48,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nuclear Scanning Microprobe Analysis of Silicon Carbide Epilayers 碳化硅外延层的核扫描微探针分析
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-28 DOI: 10.1134/S1062873824707463
M. E. Buzoverya, I. A. Karpov, A. Yu. Arkhipov, D. A. Skvortsov, V. A. Neverov, B. F. Mamin
{"title":"Nuclear Scanning Microprobe Analysis of Silicon Carbide Epilayers","authors":"M. E. Buzoverya,&nbsp;I. A. Karpov,&nbsp;A. Yu. Arkhipov,&nbsp;D. A. Skvortsov,&nbsp;V. A. Neverov,&nbsp;B. F. Mamin","doi":"10.1134/S1062873824707463","DOIUrl":"10.1134/S1062873824707463","url":null,"abstract":"<p>The surfaces of homoepitaxial 4H-SiC layers were studied using a nuclear scanning microprobe in the Rutherford backscattering mode. Analysis of the state of the sample surfaces and the synthesis conditions showed that an increase in the silicon (Si) content in the upper layers of some samples precedes the formation of highly defective 4H-SiC layers.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 8","pages":"1300 - 1305"},"PeriodicalIF":0.48,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determining the Moments of Inertia of Binary Fission Fragments 确定双裂变碎片的惯性矩
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-28 DOI: 10.1134/S1062873824707384
S. G. Kadmensky, D. E. Lyubashevsky, A. A. Pisklyukov
{"title":"Determining the Moments of Inertia of Binary Fission Fragments","authors":"S. G. Kadmensky,&nbsp;D. E. Lyubashevsky,&nbsp;A. A. Pisklyukov","doi":"10.1134/S1062873824707384","DOIUrl":"10.1134/S1062873824707384","url":null,"abstract":"<p>Correctly measuring of the moments of inertia of fragments of binary fission of actinide nuclei helps solve the important problem in nuclear physics of determining the spins of such fragments. The moments of inertia are calculated using the solid rotation, hydrodynamic, and superfluid models. The best agreement with experimental data is obtained using the superfluid model with an oscillatory potential.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 8","pages":"1249 - 1255"},"PeriodicalIF":0.48,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probing Open Charm Hadron Production with the ALICE-3 Detector at the High-Luminosity Large Hadron Collider 利用高亮度大型强子对撞机上的 ALICE-3 探测器探测开放式和谐强子的产生
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-28 DOI: 10.1134/S106287382470744X
M. V. Malaev, V. G. Riabov
{"title":"Probing Open Charm Hadron Production with the ALICE-3 Detector at the High-Luminosity Large Hadron Collider","authors":"M. V. Malaev,&nbsp;V. G. Riabov","doi":"10.1134/S106287382470744X","DOIUrl":"10.1134/S106287382470744X","url":null,"abstract":"<p>ALICE-3 is a future upgrade of the current ALICE experiment to be operated at the high-luminosity Large Hadron Collider at CERN after 2030. One of the physics objectives of the experiment is to probe the hot and dense QCD matter produced in heavy-ion collisions by measuring the production of open charm hadrons. The ALICE-3 detector is equipped to measure the production of ground and excited states of <i>D</i>‑mesons in decay channels with charged particles in the final state. Results are presented from feasibility studies of recording of open charm hadrons in decay channels with neutral photons or mesons in the final state using the large acceptance electromagnetic calorimeter.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 8","pages":"1286 - 1292"},"PeriodicalIF":0.48,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonlinear Excitation of Luminescence of Wide-Gap Crystals by Femtosecond Laser Radiation 飞秒激光辐射对宽隙晶体发光的非线性激发
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-19 DOI: 10.1134/S1062873824707013
V. I. Baryshnikov, O. V. Goreva, T. A. Kolesnikova, O. L. Nikonovich, Yu. A. Murzina
{"title":"Nonlinear Excitation of Luminescence of Wide-Gap Crystals by Femtosecond Laser Radiation","authors":"V. I. Baryshnikov,&nbsp;O. V. Goreva,&nbsp;T. A. Kolesnikova,&nbsp;O. L. Nikonovich,&nbsp;Yu. A. Murzina","doi":"10.1134/S1062873824707013","DOIUrl":"10.1134/S1062873824707013","url":null,"abstract":"<p>The features of nonlinear excitation of photoluminescence of wide-gap crystals by femtosecond laser radiation were studied. It was determined that, during multiphoton ionization of the proper substance of crystals, the excitation of intrinsic 2<i>p</i>O<sup>2–</sup> valence-band photoluminescence has a long-wavelength threshold. The yield of the impurity photoluminescence excited by the capture of the band electrons and holes induced during the nonlinear ionization of the proper substance reaches saturation with increasing intensity of femtosecond laser pulses.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 7","pages":"1022 - 1025"},"PeriodicalIF":0.48,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Ferromagnetic Resonance and Probe Microscopy Studies of Temperature-Induced Uniaxial Deformations in Planar Ferromagnetic Microparticles 平面铁磁微粒中温度诱导单轴变形的铁磁共振和探针显微镜研究
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-19 DOI: 10.1134/S1062873824707098
N. I. Nurgazizov, D. A. Bizyaev, A. P. Chuklanov, A. A. Bukharaev, L. V. Bazan, V. Ya. Shur, A. R. Akhmatkhanov
{"title":"The Ferromagnetic Resonance and Probe Microscopy Studies of Temperature-Induced Uniaxial Deformations in Planar Ferromagnetic Microparticles","authors":"N. I. Nurgazizov,&nbsp;D. A. Bizyaev,&nbsp;A. P. Chuklanov,&nbsp;A. A. Bukharaev,&nbsp;L. V. Bazan,&nbsp;V. Ya. Shur,&nbsp;A. R. Akhmatkhanov","doi":"10.1134/S1062873824707098","DOIUrl":"10.1134/S1062873824707098","url":null,"abstract":"<p>Square planar nickel microparticles deposited on the surface of single crystals of lithium niobate in the hexagonal phase and potassium titanyl phosphate were studied. Because the thermal expansion coefficients of these single crystals strongly differ, the uniaxial anisotropy is induced in the microparticles by heating or cooling relative to the deposition temperature. The phenomenon of the induction of anisotropy was explored using magnetic force microscopy and ferromagnetic resonance spectroscopy. Data obtained from ferromagnetic resonance spectra show that, in the ensemble of microparticles, with increasing temperature of the samples from –10 to 60°C, the axis of anisotropy rotates by 90°. This agrees well with the data about the domain structure of an individual microparticle, obtained by magnetic force microscopy.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 7","pages":"1067 - 1072"},"PeriodicalIF":0.48,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Photo-Stimulated EPR Spectroscopy of Oxygen Defects in a Rutile (TiO2) Crystal Irradiated with Ar Ions 用氩离子辐照金红石（TiO2）晶体中氧缺陷的光刺激 EPR 光谱分析
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-19 DOI: 10.1134/S1062873824707116
A. A. Sukhanov, V. F. Valeev, V. I. Nuzhdin, R. I. Khaibullin
{"title":"Photo-Stimulated EPR Spectroscopy of Oxygen Defects in a Rutile (TiO2) Crystal Irradiated with Ar Ions","authors":"A. A. Sukhanov,&nbsp;V. F. Valeev,&nbsp;V. I. Nuzhdin,&nbsp;R. I. Khaibullin","doi":"10.1134/S1062873824707116","DOIUrl":"10.1134/S1062873824707116","url":null,"abstract":"<p>The electron paramagnetic resonance (EPR) spectra of oxygen-deficient rutile TiO<sub>2 – δ</sub> under photoexcitation at low temperatures in the range of 15–40 K were measured. Excluding the early described Ti<sup>3+</sup> centers, concentration of which is independent of photoexcitation, new EPR signals appear at various wavelengths (λ) of photoexcitation taken in the range 400–460 nm. From the analysis of the EPR data we conclude that the observed EPR signals can be attributed to either the positive-charged oxygen vacancies (<span>({text{V}}_{{text{O}}}^{ + })</span>) with <i>S</i> = 1/2 (upon photoexcitation with λ ≤ 420 nm only), or more complex defects such as positively-charged [Ti<sup>3+</sup>–V<sub>O</sub>]<sup>+</sup> pairs with <i>S</i> = 1/2 and neutral complexes of (Ti<sup>3+</sup>–V<sub>O</sub>–Ti<sup>3+</sup>) with <i>S</i> = 1. The latter is observed upon photoexcitation with a wavelength above 420 nm.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 7","pages":"1077 - 1081"},"PeriodicalIF":0.48,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Limits of Laser Cooling of Light Alkali Metals in a Polychromatic Light Field 多色光场中轻碱金属的激光冷却极限
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-19 DOI: 10.1134/S1062873824707037
R. Ya. Ilenkov, O. N. Prudnikov, A. V. Taichenachev, V. I. Yudin
{"title":"Limits of Laser Cooling of Light Alkali Metals in a Polychromatic Light Field","authors":"R. Ya. Ilenkov,&nbsp;O. N. Prudnikov,&nbsp;A. V. Taichenachev,&nbsp;V. I. Yudin","doi":"10.1134/S1062873824707037","DOIUrl":"10.1134/S1062873824707037","url":null,"abstract":"<p>A model was developed for laser cooling of alkali atoms in a polychromatic field, considering the real structure of atomic levels. The model was tested by the example of the <sup>6</sup>Li atom. The minimum achievable temperatures of laser cooling of light alkali atoms were studied for different polarizations of the light field components, and the possibility of cooling below the Doppler limit was shown.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 7","pages":"1034 - 1040"},"PeriodicalIF":0.48,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of the Temperature Dependence of the Spectra of Spin Waves in a Thin Pd–Fe Film with Gradient Composition 具有梯度成分的钯铁薄膜中自旋波光谱的温度依赖性特征
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2024-08-19 DOI: 10.1134/S1062873824707219
I. V. Yanilkin, A. I. Gumarov, B. F. Gabbasov, R. V. Yusupov, L. R. Tagirov
{"title":"Features of the Temperature Dependence of the Spectra of Spin Waves in a Thin Pd–Fe Film with Gradient Composition","authors":"I. V. Yanilkin,&nbsp;A. I. Gumarov,&nbsp;B. F. Gabbasov,&nbsp;R. V. Yusupov,&nbsp;L. R. Tagirov","doi":"10.1134/S1062873824707219","DOIUrl":"10.1134/S1062873824707219","url":null,"abstract":"<p>An epitaxial film of a Pd–Fe alloy with a thickness of 202 nm was synthesized with an iron concentration varying in depth from 2 to 10 at %. The temperature dependence of the spin-wave resonance spectra in the film was measured. The spectra of standing spin waves were simulated. From the correlation of the theoretical spectra with the experimental data, the temperature dependences of the normalized exchange stiffness, the ratio of effective magnetization to saturation magnetization, and the surface spin pinning coefficients were obtained.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 7","pages":"1135 - 1139"},"PeriodicalIF":0.48,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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