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Path Integral for a Charged Quantum Particle in a Magnetic Field 磁场中带电量子粒子的路径积分
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S002713492670044X
K. A. Lursmanashvili, V. V. Chistiakov
{"title":"Path Integral for a Charged Quantum Particle in a Magnetic Field","authors":"K. A. Lursmanashvili,&nbsp;V. V. Chistiakov","doi":"10.3103/S002713492670044X","DOIUrl":"10.3103/S002713492670044X","url":null,"abstract":"<p>The quantum-mechanical problem of the motion of a charged particle in a magnetic field is considered. The properties of the Wiener measure under transformations of the functional integration variable of a specific type are investigated. It is shown that the functional integrals for a particle in a uniform magnetic field are equivalent to those for a free particle.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"430 - 435"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859775","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
Temperature Dependence of the Macroscopic Superconducting Order Parameter in Ba({}_{mathbf{0.45}})K({}_{mathbf{0.55}})Fe({}_{mathbf{2}})As({}_{mathbf{2}}) Ba ({}_{mathbf{0.45}}) K ({}_{mathbf{0.55}}) Fe ({}_{mathbf{2}}) As宏观超导序参量的温度依赖性({}_{mathbf{2}})
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S0027134926700517
S. N. Pontis, S. A. Kuzmichev, A. D. Lomonosova, I. A. Nikitchenkov, T. E. Kuzmicheva, I. V. Morozov, V. A. Grinenko
{"title":"Temperature Dependence of the Macroscopic Superconducting Order Parameter in Ba({}_{mathbf{0.45}})K({}_{mathbf{0.55}})Fe({}_{mathbf{2}})As({}_{mathbf{2}})","authors":"S. N. Pontis,&nbsp;S. A. Kuzmichev,&nbsp;A. D. Lomonosova,&nbsp;I. A. Nikitchenkov,&nbsp;T. E. Kuzmicheva,&nbsp;I. V. Morozov,&nbsp;V. A. Grinenko","doi":"10.3103/S0027134926700517","DOIUrl":"10.3103/S0027134926700517","url":null,"abstract":"<p>Single crystals of the overdoped iron pnictide Ba<span>({}_{0.45})</span>K<span>({}_{0.55})</span>Fe<span>({}_{2})</span>As<span>({}_{2})</span> with <span>(T_{c}approx 29)</span> K have been studied. The current–voltage characteristics of planar mechanically controlled break junctions at various temperatures have been obtained and analysed. The temperature dependence of the self-field bulk critical supercurrent in zero magnetic field is successfully described within a two-band model, which made it possible to estimate the values of the large and small superconducting gaps, their characteristic ratios, and the partial contributions of the two effective bands to the conductivity.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"478 - 484"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859854","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
Sequential Ion-Beam and Cluster-Ion Surface Processing of YBa({}_{boldsymbol{2}})Cu({}_{boldsymbol{3}})O({}_{boldsymbol{7-delta}}) 顺序离子束和簇离子表面处理YBa ({}_{boldsymbol{2}}) Cu ({}_{boldsymbol{3}}) O({}_{boldsymbol{7-delta}})
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S0027134926700529
A. V. Nazarov, D. S. Kireev, A. N. Ratsev, A. A. Tatarintsev, M. A. Ovchinnikov, A. M. Borisov, N. N. Andrianova, P. N. Degtyarenko, A. A. Shemukhin
{"title":"Sequential Ion-Beam and Cluster-Ion Surface Processing of YBa({}_{boldsymbol{2}})Cu({}_{boldsymbol{3}})O({}_{boldsymbol{7-delta}})","authors":"A. V. Nazarov,&nbsp;D. S. Kireev,&nbsp;A. N. Ratsev,&nbsp;A. A. Tatarintsev,&nbsp;M. A. Ovchinnikov,&nbsp;A. M. Borisov,&nbsp;N. N. Andrianova,&nbsp;P. N. Degtyarenko,&nbsp;A. A. Shemukhin","doi":"10.3103/S0027134926700529","DOIUrl":"10.3103/S0027134926700529","url":null,"abstract":"<p>This paper presents the results of sequential irradiation of the YBa<span>({}_{2})</span>Cu<span>({}_{3})</span>O<span>({}_{7-delta})</span> superconducting layer of a 2G HTS tape using atomic and cluster argon ions. It is shown that two-stage irradiation with monomers at a grazing incidence angle of 85<span>({}^{circ})</span> made it possible to remove <i>a</i>-orientated crystallite protrusions, significantly reducing the root-mean-square (RMS) roughness. Subsequent surface processing with cluster ions at normal ion incidence results in smoothing of the surface topography in the range of spatial frequencies from 0.5 to 10 <span>(mu)</span>m<span>({}^{-1})</span>. It is worth noting that, within the framework of this method, the depth of the modified layer does not exceed 10–20 nm, which indicates that no structural damage is introduced into the bulk of the superconducting film.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"461 - 467"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859879","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
A Simulation Approach to Evaluate the Effect of Increasing Energy on Relationship between Dosimetry Quantities 评价能量增加对剂量量关系影响的模拟方法
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S0027134926700566
Hassan Al Kanti
{"title":"A Simulation Approach to Evaluate the Effect of Increasing Energy on Relationship between Dosimetry Quantities","authors":"Hassan Al Kanti","doi":"10.3103/S0027134926700566","DOIUrl":"10.3103/S0027134926700566","url":null,"abstract":"<p>The radiation dosimetry quantities are used to calculate the operational and protection quantities by ICRU and ICRP. In the fields of radiation protection and medical physics, accurately differentiating between kerma and absorbed dose is fundamental, especially in interface regions where electronic equilibrium is disrupted. This study investigates the impact of increasing incident photon energy on the relationship between these two quantities within a water phantom, providing a high-precision quantitative analysis. A simulation approach DOSRZnrc code was employed to compute absorbed dose and kerma for mono-energetic photons at energies 0.5, 1, 10, 25, and 30 MeV and spectrum Co-60 and Cs-137 with the number of histories optimized to ensure a relative statistical uncertainty of less than 0.5<span>(%)</span>. While the qualitative behavior of these quantities is established in classical physics, this research offers significant added value by providing updated reference datasets that bridge the gap between theoretical textbook models and modern clinical practice. The difference between absorbed dose and kerma are increases with increasing energy. The ratio between absorbed dose and kerma at the medium surface is equal to 0.99, 0.12 at energies 0.5 and 30 MeV. Whereas the ratio between absorbed dose and kerma at maximum dose is equal to 0.99, 0.88 at energies 0.5 and 30 MeV. The study’s significance lies in its precise determination of Transient Charged Particle Equilibrium (TCPE) distances, ensuring higher accuracy in absorbed dose estimations for biological media and radiotherapy treatment planning.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"491 - 495"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859855","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
Photonuclear Reactions with Charged Particle Emission: Prospects for Medical Isotope Production 带电粒子发射的光核反应：医用同位素生产的前景
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S0027134926700499
M. V. Zheltonozhskaya, P. D. Remizov, A. P. Chernyaev, A. A. Kim, V. V. Varlamov, V. I. Shvedunov
{"title":"Photonuclear Reactions with Charged Particle Emission: Prospects for Medical Isotope Production","authors":"M. V. Zheltonozhskaya,&nbsp;P. D. Remizov,&nbsp;A. P. Chernyaev,&nbsp;A. A. Kim,&nbsp;V. V. Varlamov,&nbsp;V. I. Shvedunov","doi":"10.3103/S0027134926700499","DOIUrl":"10.3103/S0027134926700499","url":null,"abstract":"<p>This review focuses on methods for the production of promising medical radionuclides using photoproton nuclear reactions. Primary attention is paid to theranostic isotopes, such as lutetium isotopes <span>({}^{177})</span>Lu and rhenium isotopes <span>({}^{186,188,189})</span>Re, which can be obtained with high radionuclide purity. Of particular note is an innovative scheme for producing the diagnostic positron-emitting radioisotope zirconium <span>({}^{89})</span>Zr via photoproton reactions on molybdenum, which ensures high radionuclidic purity of the preparation and enables production organized according to the principle of a generator system. The leading role of the Skobeltsyn Institute of Nuclear Physics at Lomonosov Moscow State University in the development of this field in Russia is highlighted, which involves fundamental research on the photonuclear fission, obtaining reliable cross sections for photonuclear reactions and their subsequent application in medical technologies and clinical practice.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"375 - 391"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859875","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
Greenhouse Effect on Planets and Moons of the Solar System 太阳系行星和卫星的温室效应
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S0027134926700402
A. V. Aliakin, A. V. Karnaukhov, M. E. Prokhorov
{"title":"Greenhouse Effect on Planets and Moons of the Solar System","authors":"A. V. Aliakin,&nbsp;A. V. Karnaukhov,&nbsp;M. E. Prokhorov","doi":"10.3103/S0027134926700402","DOIUrl":"10.3103/S0027134926700402","url":null,"abstract":"<p>The article presents a review of the greenhouse effect on Earth, as well as on various planets and moons of the Solar System. The history of the study of this phenomenon is described. Various types of the greenhouse effect are considered. References to key scientific works on all the listed issues are given. The comparative analysis provided may give an idea of possible atmospheric processes and conditions on the surface of terrestrial-type exoplanets.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"392 - 411"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859876","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
Recovering of Gaps in Multivariate Time Series Using Methods of Mathematical Statistics and Machine Learning 利用数理统计和机器学习方法恢复多元时间序列中的间隙
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S0027134926700487
V. S. Aleshnovskii, V. K. Avilov, P. V. Golubtsov, Yu. A. Kurbatova, O. A. Kuricheva, D. A. Makeev, P. A. Fadeeva, A. I. Chulichkov, N. E. Shapkina
{"title":"Recovering of Gaps in Multivariate Time Series Using Methods of Mathematical Statistics and Machine Learning","authors":"V. S. Aleshnovskii,&nbsp;V. K. Avilov,&nbsp;P. V. Golubtsov,&nbsp;Yu. A. Kurbatova,&nbsp;O. A. Kuricheva,&nbsp;D. A. Makeev,&nbsp;P. A. Fadeeva,&nbsp;A. I. Chulichkov,&nbsp;N. E. Shapkina","doi":"10.3103/S0027134926700487","DOIUrl":"10.3103/S0027134926700487","url":null,"abstract":"<p>The research focuses on multivariate time series of geophysical parameters. During the study, statistical and machine learning methods were employed to recover missing data. The following results were achieved: for the CO<span>({}_{2})</span> concentration series at a height of 30 m, the ARIMAX model demonstrated the lowest RMSE and MAE metrics, taking only 2.3 s for recovery, which is significantly faster compared to the LSTM (251 s) and GRU (160 s) neural network models. Recovery of air–temperature data was performed most effectively using the recurrent neural network GRU. The results indicate that ARIMA family models are more suitable for data recovery when correlated parameters are present, whereas GRU-based neural networks are preferable in other cases. The conclusions can be used to improve data recovery methods in multivariate time series.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"412 - 419"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859877","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
Fast Method of Bolus Shape Calculation in an Ion-Beam Therapy Planning System 离子束治疗计划系统中丸形的快速计算方法
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-08-31 DOI: 10.3103/S0027134926700426
A. A. Larionov, F. R. Studenikin, O. P. Yushchenko
{"title":"Fast Method of Bolus Shape Calculation in an Ion-Beam Therapy Planning System","authors":"A. A. Larionov,&nbsp;F. R. Studenikin,&nbsp;O. P. Yushchenko","doi":"10.3103/S0027134926700426","DOIUrl":"10.3103/S0027134926700426","url":null,"abstract":"<p>A method of bolus shape calculation in ion-beam therapy for a large set of ions and for various bolus materials is presented. Currently, it is possible to use any ion in the range H–Ca, and a list of bolus materials can include polystyrene, PLA, and aluminium. The list of ions and materials can be expanded. This method is implemented as a component of the planning system for the ion-beam therapy centre being developed at the NRC ‘‘Kurchatov Institute’’—IHEP. An example of bolus calculation for a real patient and the results of verification using detailed modelling in GEANT4 are presented.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 3","pages":"485 - 490"},"PeriodicalIF":0.4,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859897","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
Morphological Methods for Estimating the Relative Delay of Infrasound Signals in the Form of N- and U-Waves 估计N波和u波形式的次声信号相对延迟的形态学方法
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-06-23 DOI: 10.3103/S0027134926700323
A. F. Idrisov, A. I. Chulichkov, S. N. Kulichkov
{"title":"Morphological Methods for Estimating the Relative Delay of Infrasound Signals in the Form of N- and U-Waves","authors":"A. F. Idrisov,&nbsp;A. I. Chulichkov,&nbsp;S. N. Kulichkov","doi":"10.3103/S0027134926700323","DOIUrl":"10.3103/S0027134926700323","url":null,"abstract":"<p>The present paper investigates the accuracy of estimating the relative time delay for model infrasound signals of complex shape, represented as a combination of N- and U-waves typical of recordings of natural events (explosions, eruptions, meteors). To solve this problem, it is proposed to apply morphological methods of signal analysis developed at the Department of Mathematical Modelling and Computer Science of the Faculty of Physics of Lomonosov Moscow State University. These methods make it possible to work effectively with the waveform, which is crucial for the correct determination of the time parameters of non-stationary waves. Brief descriptions of the morphological approach and the features of N-/U-waves are given, as well as the results of a computer experiment on estimating the relative delay of model signals using morphological methods. The experiment demonstrates the operability and potential advantages of the proposed methods in the presence of interference and distortions of the waveform. The obtained results can be used to improve the accuracy and reliability of systems for locating infrasound sources in the field of geophysics and atmospheric physics.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 2","pages":"367 - 373"},"PeriodicalIF":0.4,"publicationDate":"2026-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148299860","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
Modelling of the SPD End-Cap Tracker SPD端盖跟踪器的建模
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2026-06-23 DOI: 10.3103/S0027134926700372
V. A. Kuzmin
{"title":"Modelling of the SPD End-Cap Tracker","authors":"V. A. Kuzmin","doi":"10.3103/S0027134926700372","DOIUrl":"10.3103/S0027134926700372","url":null,"abstract":"<p>Using the example of the straw end-cap tracker of the SPD detector (Spin Physics Detector), which is currently being developed at the Joint Institute for Nuclear Research (Dubna, Moscow oblast), the operation of a detector of this type is simulated for estimating the efficiency and accuracy of track reconstruction for various configurations of its layers. It is shown that a tracker with a two-layer construction of coordinate planes cannot unambiguously provide information for track reconstruction because of the large range of angles of incidence of the tracks into the detector. A reconstruction method is proposed for a layered detector made of drift tubes, in which the layers are not combined into coordinate planes, and only signals from individual detector layers are used for track reconstruction. In order to find the optimal geometry of the tracker being designed, the efficiency and accuracy of track reconstruction are calculated for 20 different geometric configurations of the detector with different levels of the accuracy of its electronics. The sufficiency of the modelling methodology used is demonstrated. The simulation results indicate the possibility of creating a tracker with single-layer coordinate planes, which is analogous in accuracy to a detector consisting of perfect two-layer coordinate planes.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"81 2","pages":"277 - 285"},"PeriodicalIF":0.4,"publicationDate":"2026-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148299900","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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