Bulletin of the Lebedev Physics Institute最新文献_第2页

Algorithm for Determining the Dielectric Ionization Threshold during Etching of Heavy-Ion Tracks 重离子径迹蚀刻过程中介电电离阈值的确定算法

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-09 DOI: 10.3103/S1068335626601068

E. N. Starkova, N. I. Starkov

引用次数: 0

Optimization and Measurement of the Spectrum of an Epithermal Neutron Source for Applied Research 应用研究用超热中子源光谱的优化与测量

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-09 DOI: 10.3103/S1068335625603309

S. I. Potashev, I. V. Meshkov, V. S. Litvin

引用次数: 0

Estimation of the Energy of an Accelerated Electron Beam from the Angular Distribution of Bremsstrahlung 从轫致辐射角分布估计加速电子束的能量

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-09 DOI: 10.3103/S1068335626600634

A. A. Danilov, V. I. Shvedunov

引用次数: 0

Study of the Vibrational and Electronic Properties of the Toluene Molecule Based on Isotropic and Anisotropic Raman Spectra 基于各向同性和各向异性拉曼光谱的甲苯分子振动和电子性质研究

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-11-09 DOI: 10.3103/S1068335626601159

A. A. Absanov, Sh. U. Umidullayev, M. T. Shoimov, I. R. Abdurakhmanov, F. A. Salaxitdinov, Kh. A. Kodirov, A. Kh. Safarov, A. A. Boliev

{"title":"Study of the Vibrational and Electronic Properties of the Toluene Molecule Based on Isotropic and Anisotropic Raman Spectra","authors":"A. A. Absanov, Sh. U. Umidullayev, M. T. Shoimov, I. R. Abdurakhmanov, F. A. Salaxitdinov, Kh. A. Kodirov, A. Kh. Safarov, A. A. Boliev","doi":"10.3103/S1068335626601159","DOIUrl":"10.3103/S1068335626601159","url":null,"abstract":"Using Raman spectroscopy in combination with quantum chemical calculations, the noncoincidence effect (NCE) [1] in the toluene molecule is investigated. Based on a comparative analysis of isotropic and anisotropic Raman spectra, frequency shifts and spectral changes characteristic of the corresponding vibrational modes are identified. It is shown that dipole‒dipole and other intermolecular interactions are the determining factors responsible for the occurrence of the noncoincidence effect. To characterize the electronic and geometric properties of the toluene molecule, calculations are carried out using DFT at the B3LYP/6-311++G(d,p) level of theory. Analysis of the HOMO–LUMO (highest occupied molecular orbital‒lowest unoccupied molecular orbital) frontier orbitals made it possible to characterize the reactivity of the molecule and the features of intramolecular charge transfer. Using molecular electrostatic potential (MEP) maps, the electrophilic and nucleophilic centers of the molecule are identified. Satisfactory agreement between theoretical results and experimental Raman data is established, providing a reliable interpretation of the electronic structure and intermolecular interactions in toluene.","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 10","pages":"419 - 427"},"PeriodicalIF":0.6,"publicationDate":"2026-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149369252","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

Interactions of Dirac Dark Matter Particles in the E6 Composite Higgs Model 狄拉克暗物质粒子在E6复合希格斯模型中的相互作用

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600774

M. G. Belyakova

引用次数: 0

Measurement of the Inclusive Branching-Fraction Ratio ({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }}) to ({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }}) at Belle and Belle II 百丽和百丽的包容性分支分数比({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }})至({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }})的测量2

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600920

S. Zakharov

{"title":"Measurement of the Inclusive Branching-Fraction Ratio ({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }}) to ({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }}) at Belle and Belle II","authors":"S. Zakharov","doi":"10.3103/S1068335626600920","DOIUrl":"10.3103/S1068335626600920","url":null,"abstract":"We report the status of an ongoing measurement of the branching-fraction ratio (mathcal{B})(B– → ({{D}^{{*0}}}{{pi }^{ - }}){text{/}}mathcal{B}({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }})) using (711{kern 1pt} ,{text{f}}{{{text{b}}}^{{ - 1}}}) of Belle data and (362,{kern 1pt} {text{f}}{{{text{b}}}^{{ - 1}}}) of Belle II data collected at the (Upsilon (4S)) resonance. The signal yields are extracted with an inclusive recoil-mass method: one B meson (the tag-B) is fully reconstructed in hadronic modes, and only the charged pion from the signal B is reconstructed. A deep neural-network classifier is used for background suppression. The invariant mass of the remaining unreconstructed particles, referred to as the recoil mass, is calculated using the known initial ({{e}^{ + }}{{e}^{ - }}) state and the reconstructed tag-B and charged pion, and is fit to extract the (Dpi ) and (D{text{*}}pi ) yields. The fit uses separate signal shapes for correctly and incorrectly reconstructed tag-(B) candidates. The branching-fraction ratio remains blinded while the analysis procedure is finalized; we obtain a statistical uncertainty of (1.7% ). For comparison, the world-average PDG relative uncertainties are 2.2% for ({{B}^{ - }} to {{D}^{0}}{{pi }^{ - }}) and (2.9% ) for ({{B}^{ - }} to {{D}^{{*0}}}{{pi }^{ - }}). The ({{B}^{ - }} to {{D}^{{(*)0}}}{{pi }^{ - }}) fits also determine tag-mode-dependent corrections to the ({{B}_{{{text{tag}}}}}) reconstruction efficiency and good-tag fractions. These corrections are used in the inclusive measurement of the branching fraction of ({{B}^{ - }} to X(3872){{K}^{ - }}).","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"53 9","pages":"394 - 401"},"PeriodicalIF":0.6,"publicationDate":"2026-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149189742","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

Description of Doubly Heavy Tetraquarks Within the Relativistic Quark Model 相对论夸克模型中双重四夸克的描述

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600889

V. O. Galkin, E. M. Savchenko

引用次数: 0

Effect of Doping of Ag/α-Si Memristors with Ti Ti掺杂对Ag/α-Si忆阻器的影响

IF 0.6 4区物理与天体物理

Bulletin of the Lebedev Physics Institute Pub Date : 2026-10-16 DOI: 10.3103/S1068335626600336

A. S. Samsonova, O. A. Klimenko, V. N. Antonov

引用次数: 0

CP-Asymmetry in (Upsilon ) Decays: Contributions of C-odd and C-even States of the ({{B}^{0}}{{bar {B}}^{0}}) (Upsilon )衰变中的cp -不对称性：c奇数态和c偶态的贡献 ({{B}^{0}}{{bar {B}}^{0}})