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CPP/NPP Experiments on Measuring the Polarizabilities of Charged and Neutral Pions 测量带电和中性介子极化率的CPP/NPP实验
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701996
V. V. Tarasov, I. F. Larin
{"title":"CPP/NPP Experiments on Measuring the Polarizabilities of Charged and Neutral Pions","authors":"V. V. Tarasov,&nbsp;I. F. Larin","doi":"10.3103/S0027134924701996","DOIUrl":"10.3103/S0027134924701996","url":null,"abstract":"<p>Polarizability is a fundamental characteristic of hadronic particles. Measuring the polarizabilities of pions allows for checking the predictions of chiral perturbation theory (ChPT). Currently, an analysis of the CPP and NPP experimental data is being conducted, with the goal of measuring the polarizabilities of pions by determining the Primakoff pair production cross-section. For this purpose, in the summer of 2022, experimental data were collected at the TJNAF accelerator by studying the interactions of a polarized photon beam with energies of 4.5–6.0 GeV with a lead-208 target at the upgraded GlueX setup. Existing experiments on pion polarizability measurements, theoretical predictions of polarizabilities, the design of the CPP/NPP experiments, the expected results from these experiments, and the preliminary analysis of the collected data are discussed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"580 - 586"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994852","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
Faraday Rotation Dynamics in Hybrid Magnetophotonic Metasurfaces 混合磁光子超表面的法拉第旋转动力学
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S002713492470190X
A. M. Chernyak, A. I. Musorin, A. A. Fedyanin
{"title":"Faraday Rotation Dynamics in Hybrid Magnetophotonic Metasurfaces","authors":"A. M. Chernyak,&nbsp;A. I. Musorin,&nbsp;A. A. Fedyanin","doi":"10.3103/S002713492470190X","DOIUrl":"10.3103/S002713492470190X","url":null,"abstract":"<p>The behavior of Faraday rotation on the femtosecond timescale in Mie-resonant magnetophotonic metasurfaces formed by a two-dimensional array of silicon nanodisks coated with a thin nickel film is studied. It is shown that in the static case, the maximum of polarization plane rotation is <span>(14^{circ})</span> at the resonant wavelength for spectrally overlapped electric and magnetic dipole modes. When a single femtosecond laser pulse passes through the designed metasurface, it splits into two pulses with durations twice shorter than the original one, and the polarization planes are rotated in opposite directions, forming almost orthogonal replicas.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"592 - 595"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995217","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
Molecular Dynamics Simulation of Structural Transformations in the Conducting Channel of Memristors Based on Nonstoichiometric and Ion-Irradiated Silicon Oxides 基于非化学计量和离子辐照硅氧化物的忆阻器导电通道结构转变的分子动力学模拟
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701947
E. V. Okulich, V. I. Okulich, I. K. Gainullin, D. I. Tetelbaum, A. N. Mikhaylov
{"title":"Molecular Dynamics Simulation of Structural Transformations in the Conducting Channel of Memristors Based on Nonstoichiometric and Ion-Irradiated Silicon Oxides","authors":"E. V. Okulich,&nbsp;V. I. Okulich,&nbsp;I. K. Gainullin,&nbsp;D. I. Tetelbaum,&nbsp;A. N. Mikhaylov","doi":"10.3103/S0027134924701947","DOIUrl":"10.3103/S0027134924701947","url":null,"abstract":"<p>Using the molecular dynamics method, the processes of structural changes occurring over a period of approximately 100 ns in the filament region of a memristor, formed in nonstoichiometric silicon oxides, including those subjected to ion implantation, during forming and/or switching, were simulated. The influence of high temperature, at which the filament region is located during certain stages of the memristor’s operation, was also studied. It was shown that significant structural rearrangements occur over the specified time periods, consisting in the formation and disintegration of various complexes, which is confirmed by the calculations of radial distribution functions of distances between atoms in various combinations.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"533 - 541"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995266","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
Precession of Stellar Rings in the Center of Galaxy 星系中心恒星环的进动
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701911
B. P. Kondratyev, K. A. Klyuchinsky
{"title":"Precession of Stellar Rings in the Center of Galaxy","authors":"B. P. Kondratyev,&nbsp;K. A. Klyuchinsky","doi":"10.3103/S0027134924701911","DOIUrl":"10.3103/S0027134924701911","url":null,"abstract":"<p>The dynamics of two interacting concentric wide star rings located around a supermassive black hole in the central parsec of the Galaxy is investigated. The most massive of them, the ring with the retrograde motion of stars (known in the literature as a ‘‘clockwise’’ disk) is modeled as R-disk with a small cutout in the center. Another ring with a direct motion of stars (‘‘counter-clockwise’’ disk) is represented by a thin circular ring with an inclination <span>(alphaapprox 62^{circ})</span> to the plane of the R-disk. The masses of these rings <span>(M_{1})</span>, <span>(M_{2})</span>\u0000 <span>(left(M_{1}/M_{2}approx 60right))</span>, their geometric parameters and spatial orientation are known from observations. The mutual gravitational energy <span>(W_{textrm{mut}})</span> and the angular moment of force <span>(mathbf{M})</span> between the rings have been found, and graphs of these quantities depending on the angle of inclination have been constructed. The angular momenta of the rings <span>(L^{(1)})</span> and <span>(L^{(2)})</span>, whose ratio <span>(L^{(1)}/L^{(2)}approx 23.4)</span> have also been calculated. For the system of rings, the Laplace plane and the angles of its orientation are determined. It has been established that the mutual perturbation of the rotating rings leads to precession of the nodes with a period of <span>(T_{Omega}approx 3.53times 10^{5})</span> years. The lines of the nodes of both rings in the Laplace plane move with the same angular velocity but in opposite directions. This explains the large angle of divergence of the lines of nodes known from observations.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"627 - 633"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995227","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
Weak Inner Layer in the Reaction-Diffusion-Advection Problem in the Case of a Reaction Discontinuity 反应不连续情况下反应扩散平流问题的弱内层
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S002713492470200X
E. I. Nikulin, A. V. Karamyshev
{"title":"Weak Inner Layer in the Reaction-Diffusion-Advection Problem in the Case of a Reaction Discontinuity","authors":"E. I. Nikulin,&nbsp;A. V. Karamyshev","doi":"10.3103/S002713492470200X","DOIUrl":"10.3103/S002713492470200X","url":null,"abstract":"<p>The present work is devoted to the study of a one-dimensional reaction-advection-diffusion equation with weak smooth advection and a discontinuous reaction in the spatial coordinate. The work includes the construction of the asymptotics, proof of existence, and investigation of the stability of stationary solutions with the constructed asymptotics, which exhibit a weak inner layer that forms near the discontinuity point. For constructing the asymptotics, the method of A.B. Vasilieva was used; for proving the existence of the solution, the asymptotic method of differential inequalities was employed; and for studying the stability, the method of contracting barriers was applied. It is shown that such a solution, as the solution of the corresponding initial-boundary value problem, is asymptotically stable in the sense of Lyapunov. The stability region of finite (not asymptotically small) width for such a solution is specified, and it is established that the stationary problem has a unique solution in this region.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"560 - 569"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994853","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
Features of the Formation of Complexes of ({beta})-Carboxymethyl Cyclodextrins on the Surface of Lipid Monolayers 脂质单分子层表面({beta}) -羧甲基环糊精络合物的形成特征
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701881
I. V. Grigoryan, A. M. Adelyanov, A. P. Parkhaeva, G. B. Khomutov, E. Yu. Simonenko, A. G. Mironova, V. A. Pigareva, A. V. Sybachin
{"title":"Features of the Formation of Complexes of ({beta})-Carboxymethyl Cyclodextrins on the Surface of Lipid Monolayers","authors":"I. V. Grigoryan,&nbsp;A. M. Adelyanov,&nbsp;A. P. Parkhaeva,&nbsp;G. B. Khomutov,&nbsp;E. Yu. Simonenko,&nbsp;A. G. Mironova,&nbsp;V. A. Pigareva,&nbsp;A. V. Sybachin","doi":"10.3103/S0027134924701881","DOIUrl":"10.3103/S0027134924701881","url":null,"abstract":"<p>In this study, the interaction of <span>(beta)</span>-carboxymethyl cyclodextrins (CMCD) with monomolecular layers composed of a mixture of electroneutral and cationic lipids on the surface of an aqueous subphase was investigated. The monolayers were transferred onto mica substrates using the Langmuir–Blodgett method and examined by atomic force microscopy. Analysis of the monolayer compression isotherms and AFM images showed that the adsorption of CMCD on the cationic Langmuir lipid monolayer is accompanied by the formation of supramolecular ensembles of similar morphology regardless of the concentration of the added oligosaccharides.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"621 - 626"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995228","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
Development of an Electron Linac for Radiation Therapy. II. Reduction of Accelerating Field Strength, Improvement of Accelerating Structure Efficiency 放射治疗用电子直线加速器的研制。2。降低加速场强，提高加速结构效率
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-01-17 DOI: 10.3103/S0027134924701972
D. S. Yurov, M. A. Borisov, A. S. Alimov, S. Z. Bagova, A. N. Ermakov, A. N. Kamanin, C. K. Lobzhanidze, N. I. Pakhomov, A. S. Simonov, V. A. Khankin, V. I. Shvedunov, I. V. Shvedunov, N. V. Shvedunov
{"title":"Development of an Electron Linac for Radiation Therapy. II. Reduction of Accelerating Field Strength, Improvement of Accelerating Structure Efficiency","authors":"D. S. Yurov,&nbsp;M. A. Borisov,&nbsp;A. S. Alimov,&nbsp;S. Z. Bagova,&nbsp;A. N. Ermakov,&nbsp;A. N. Kamanin,&nbsp;C. K. Lobzhanidze,&nbsp;N. I. Pakhomov,&nbsp;A. S. Simonov,&nbsp;V. A. Khankin,&nbsp;V. I. Shvedunov,&nbsp;I. V. Shvedunov,&nbsp;N. V. Shvedunov","doi":"10.3103/S0027134924701972","DOIUrl":"10.3103/S0027134924701972","url":null,"abstract":"<p>The second part of the article on the development of an electron linac for the radiation therapy complex ‘‘Onyx’’ is devoted to solving problems associated with the high electric field strength in the accelerating structure, which include high dark currents, a lengthy conditioning process, significant consumption of pulsed RF power for ohmic losses in the structure walls, and its low efficiency. The article outlines the steps we took to reduce the electric field and increase the efficiency of the accelerating structure. The main results of the bremsstrahlung characteristics tests for the final version of the accelerating structure are presented.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 5","pages":"656 - 664"},"PeriodicalIF":0.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995213","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
Structural and Electronic Properties in Monolayer MoS ({}_{mathbf{2}}) with Various Vacancies: First-Principles Calculations 具有各种空位的单层 MoS （{}_{mathbf{2}}）的结构和电子特性：第一原理计算
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-10-09 DOI: 10.3103/S0027134924700668
Zhi-Xin Bai, Fan-Jin Lu, Qi-Jun Liu, Zheng-Tang Liu
{"title":"Structural and Electronic Properties in Monolayer MoS ({}_{mathbf{2}}) with Various Vacancies: First-Principles Calculations","authors":"Zhi-Xin Bai,&nbsp;Fan-Jin Lu,&nbsp;Qi-Jun Liu,&nbsp;Zheng-Tang Liu","doi":"10.3103/S0027134924700668","DOIUrl":"10.3103/S0027134924700668","url":null,"abstract":"<p>The structural and electronic properties of perfect and defective MoS<span>({}_{2})</span> have been calculated with first-principles density functional theory. The defect stability has been evaluated using the defect formation energy. The calculated results show that the formation of Mo, S, and Mo–S defects requires extra energy. Moreover, the S vacancy is energetically more favourable than the Mo vacancy. After doping, the defect level is introduced into the forbidden band. The defect level in the Mo defect model tends to be the acceptor level, while the defect level in the S defect model and Mo–S defect model tends to be the donor level. These three different defect models still maintain the direct band gap characteristics as perfect models. Then, the type of conduction after doping is also analyzed. The projected state density and the charge density of these four models have been analyzed, showing the positions of defect energy levels and change of chemical bonds.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 4","pages":"500 - 506"},"PeriodicalIF":0.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410891","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
Experimental Assessment of Magnetic Resonance Imaging Distortion for Radiation Therapy Planning 用于放射治疗规划的磁共振成像失真实验评估
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-10-09 DOI: 10.3103/S0027134924700632
E. N. Lykova, A. A. Shcherbakov, A. P. Strelkovskaya, F. R. Studenikin, S. A. Gavrilova, A. P. Chernyaev
{"title":"Experimental Assessment of Magnetic Resonance Imaging Distortion for Radiation Therapy Planning","authors":"E. N. Lykova,&nbsp;A. A. Shcherbakov,&nbsp;A. P. Strelkovskaya,&nbsp;F. R. Studenikin,&nbsp;S. A. Gavrilova,&nbsp;A. P. Chernyaev","doi":"10.3103/S0027134924700632","DOIUrl":"10.3103/S0027134924700632","url":null,"abstract":"<p>MRI is widely used in radiation therapy planning, particularly in stereotactic radiosurgery for brain metastases. The article addresses the geometric distortion of MRI images, which can lead to errors in radiation therapy planning. A series of experiments with a simple phantom were conducted on two MRI scanners with 0.5 and 1.5 T magnetic fields. Deviations in the positions of the phantom objects from their actual locations were observed. The detected deviations can reach up to 5 mm. A theoretical dependence of the magnetic field gradient on the distance to the center of homogeneity was calculated, which agrees well with the approximation of experimental data. An assessment was made of the dependence of the image area distortion of objects located at the center of the field homogeneity on their actual sizes. It was found that the area deviation can reach up to 20<span>(%)</span>.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 4","pages":"524 - 532"},"PeriodicalIF":0.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410869","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
Orbital and Spin Parts of Angular Momentum Flux Density of Monochromatic Radiation in Nonabsorbing Media with Nonlocal Nonlinear Optical Response 具有非局部非线性光学响应的非吸收介质中单色辐射角动量通量密度的轨道和自旋部分
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2024-10-09 DOI: 10.3103/S0027134924700619
P. S. Ryzhikov, V. A. Makarov
{"title":"Orbital and Spin Parts of Angular Momentum Flux Density of Monochromatic Radiation in Nonabsorbing Media with Nonlocal Nonlinear Optical Response","authors":"P. S. Ryzhikov,&nbsp;V. A. Makarov","doi":"10.3103/S0027134924700619","DOIUrl":"10.3103/S0027134924700619","url":null,"abstract":"<p>Using the conservation law for the angular momentum of electromagnetic field in the form of a balance equation, which links the angular momentum density, the angular momentum flux density, and the torque density caused by the anisotropy of the medium in a nonabsorbing medium, formulas for the densities of the orbital and spin parts of the angular momentum and the flux densities of these quantities are derived in the case of the interaction of monochromatic waves in a nonabsorbing medium with spatial dispersion that demonstrates an <span>(n)</span>th order nonlinear optical response to an external light field. In media without spatial and frequency dispersion, the obtained expressions coincide with the canonical expressions for the densities of the orbital and spin parts of the angular momentum, as well as their flux densities. Related to the nonlinearity of the medium, additional terms to the greatest components of the spin parts of the angular momentum and its flux densities can reach ten percent of the corresponding linear parts during the self-focusing of an elliptically polarized Gaussian laser beam in an isotropic gyrotropic medium near the area of its collapse.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"79 4","pages":"485 - 493"},"PeriodicalIF":0.4,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142410888","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
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