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Bulletin of the Lebedev Physics Institute最新文献

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Nonlinear Scattering of Light in Suspensions of Porous Silicon Nanoparticles 多孔硅纳米颗粒悬浮液中的非线性光散射
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-09-25 DOI: 10.3103/S1068335624600621
A. F. Bunkin, M. A. Davydov, A. N. Fedorov, L. A. Osminkina
{"title":"Nonlinear Scattering of Light in Suspensions of Porous Silicon Nanoparticles","authors":"A. F. Bunkin,&nbsp;M. A. Davydov,&nbsp;A. N. Fedorov,&nbsp;L. A. Osminkina","doi":"10.3103/S1068335624600621","DOIUrl":"10.3103/S1068335624600621","url":null,"abstract":"<p>In a series of measurements, a comparison is made of nonlinear scattering in suspensions of porous silicon nanoparticles in ethanol and bidistilled water. Scattering has a threshold character in terms of the concentration of nanoparticles and the energy of the initiating laser. With a small difference in the sizes of nanoparticles, a significant difference in the nature of scattering spectra and optimal concentrations of suspensions is observed.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 8","pages":"306 - 309"},"PeriodicalIF":0.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413834","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
Scintillation Properties of Electromagnetic Calorimeter Modules Based on BaF2 Crystals 基于 BaF2 晶体的电磁量热计模块的闪烁特性
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-09-25 DOI: 10.3103/S1068335624600475
M. V. Belov, M. V. Zavertyaev, V. A. Kozlov, V. S. Tskhay
{"title":"Scintillation Properties of Electromagnetic Calorimeter Modules Based on BaF2 Crystals","authors":"M. V. Belov,&nbsp;M. V. Zavertyaev,&nbsp;V. A. Kozlov,&nbsp;V. S. Tskhay","doi":"10.3103/S1068335624600475","DOIUrl":"10.3103/S1068335624600475","url":null,"abstract":"<p>We report a study of optical and scintillation properties of modules of a prototype electromagnetic calorimeter based on barium fluoride crystals (BaF<sub>2</sub>) measuring 25 × 25 × 160 mm<sup>3</sup>. The length of the crystal radiator of the calorimeter is optimized using the Monte Carlo method in order to improve its energy resolution. Homogeneity of the light output from different sections of the module using gamma quanta from a <sup>137</sup>Cs source is demonstrated. The scintillation time of the crystal module under gamma excitation is measured.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 8","pages":"273 - 277"},"PeriodicalIF":0.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413836","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
New Scintillation Crystals YAG:Yb3+:Mg2+ and YAG:Yb3+:Ca2+:Mg2+ with a Short Decay Time 衰减时间短的新型闪烁晶体 YAG:Yb3+:Mg2+ 和 YAG:Yb3+:Ca2+:Mg2+
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-09-25 DOI: 10.3103/S1068335624600724
M. V. Belov, V. I. Vlasov, Yu. D. Zavartsev, M. V. Zavertyaev, A. I. Zagumennyi, V. A. Kozlov, N. V. Pestovskii, S. Yu. Savinov, V. S. Tskhay
{"title":"New Scintillation Crystals YAG:Yb3+:Mg2+ and YAG:Yb3+:Ca2+:Mg2+ with a Short Decay Time","authors":"M. V. Belov,&nbsp;V. I. Vlasov,&nbsp;Yu. D. Zavartsev,&nbsp;M. V. Zavertyaev,&nbsp;A. I. Zagumennyi,&nbsp;V. A. Kozlov,&nbsp;N. V. Pestovskii,&nbsp;S. Yu. Savinov,&nbsp;V. S. Tskhay","doi":"10.3103/S1068335624600724","DOIUrl":"10.3103/S1068335624600724","url":null,"abstract":"<p>New YAG:Yb:Mg and YAG:Yb:Ca:Mg crystals with a short decay time are grown for the first time using the Czochralski method. The pulsed cathodoluminescence spectra of the new scintillators, their light output, and decay time are studied. The light output of the YAG:Yb:Mg and YAG:Yb:Ca:Mg crystals are found to be 460 and 770 photons/MeV, respectively. It is shown that the decay time spectra of the new crystals are described by two components: 1.57/8.5 ns for YAG:Yb:Mg and 1.52/7.79 ns for YAG:Yb:Ca:Mg.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 8","pages":"290 - 293"},"PeriodicalIF":0.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413837","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
Single-Gap Superconductivity of K0.8Fe1.7(Se0.72S0.28)2 Determined Using Tunneling and Andreev Spectroscopy 利用隧道和安德列夫光谱测定 K0.8Fe1.7(Se0.72S0.28)2 的单隙超导性
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-09-25 DOI: 10.3103/S1068335624600839
T. E. Kuzmicheva, S. A. Kuzmichev, Ye. O. Rakhmanov, I. V. Morozov
{"title":"Single-Gap Superconductivity of K0.8Fe1.7(Se0.72S0.28)2 Determined Using Tunneling and Andreev Spectroscopy","authors":"T. E. Kuzmicheva,&nbsp;S. A. Kuzmichev,&nbsp;Ye. O. Rakhmanov,&nbsp;I. V. Morozov","doi":"10.3103/S1068335624600839","DOIUrl":"10.3103/S1068335624600839","url":null,"abstract":"<p>For the first time, using tunneling and Andreev spectroscopies of planar break-junctions, we have studied the properties of the superconducting subsystem of K<sub>0.8</sub>Fe<sub>1.7</sub>(Se<sub>0.72</sub>S<sub>0.28</sub>)<sub>2</sub> iron selenide single crystals with a natural phase separation. We have directly determined its energy characteristics: the magnitude of the superconducting order parameter Δ(0), and its characteristic ratio 2Δ(0)/<i>k</i><sub>B</sub><i>T</i><sub>c</sub>. The obtained temperature behavior of the critical current <i>I</i><sub>c</sub>(<i>T</i>)/<i>I</i><sub>c</sub>(0) could be fitted with Ambegaokar-Baratoff formula using the experimental 2Δ(0)/<i>k</i><sub>B</sub><i>T</i><sub>c</sub> value.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 8","pages":"278 - 283"},"PeriodicalIF":0.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413838","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
Simulation of Bragg Curves Produced by Protons, Alpha-Particles, and Carbon Ions in Water 模拟质子、α粒子和碳离子在水中产生的布拉格曲线
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-09-25 DOI: 10.3103/S1068335624601006
A. V. Bagulya, V. M. Grichine, V. A. Ryabov, I. N. Zavestovskaya
{"title":"Simulation of Bragg Curves Produced by Protons, Alpha-Particles, and Carbon Ions in Water","authors":"A. V. Bagulya,&nbsp;V. M. Grichine,&nbsp;V. A. Ryabov,&nbsp;I. N. Zavestovskaya","doi":"10.3103/S1068335624601006","DOIUrl":"10.3103/S1068335624601006","url":null,"abstract":"<p>Bragg curves for protons, alpha-particles, and carbon ions in water are calculated using the Geant4 software package. The calculation results, which are of interest for practical applications in proton and ion therapy, are compared with experimental data in terms of the reduced values of χ<sup>2</sup>. The best result is obtained within the framework of the QBBC-opt_0 physical list, which is not optimized for medical applications. It is concluded that the accuracy of a patient’s radiation planning can be improved by developing alternative models of ionization of slow particles in biomaterials. A specific model is proposed, the development of which will help solve this problem.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 8","pages":"300 - 305"},"PeriodicalIF":0.6,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142413841","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
Two-Photon Optical Stimulation for Readout of Radiation Detectors 用于辐射探测器读数的双光子光刺激技术
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-08-28 DOI: 10.3103/S1068335624600712
A. S. Selyukov, A. É. Primenko, I. A. Zakharchuk, M. N. Agapov, M. É. Gekht, M. I. Danilkin
{"title":"Two-Photon Optical Stimulation for Readout of Radiation Detectors","authors":"A. S. Selyukov,&nbsp;A. É. Primenko,&nbsp;I. A. Zakharchuk,&nbsp;M. N. Agapov,&nbsp;M. É. Gekht,&nbsp;M. I. Danilkin","doi":"10.3103/S1068335624600712","DOIUrl":"10.3103/S1068335624600712","url":null,"abstract":"<p>Based on an analysis of published data, we formulate an idea that a cascade two-photon transfer of holes from traps to recombination centers occurs in borate phosphors used in dosimetry. The previously described kinetic model is supplemented with the absorption of a second photon by a hole in a metastable state. It is concluded that the intensity of the stimulating light flux should be accurately stabilized if readout occurs in the two-photon regime, since in this case the maximum amplitude of the optically stimulated glow curve has a complex dependence on the intensity of the light flux.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 7","pages":"240 - 243"},"PeriodicalIF":0.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186802","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
Modeling of Optical Systems for Obtaining X-Ray Images of Inclined Objects 获取倾斜物体 X 射线图像的光学系统建模
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-08-28 DOI: 10.3103/S1068335624600670
A. S. Busarov, N. L. Popov
{"title":"Modeling of Optical Systems for Obtaining X-Ray Images of Inclined Objects","authors":"A. S. Busarov,&nbsp;N. L. Popov","doi":"10.3103/S1068335624600670","DOIUrl":"10.3103/S1068335624600670","url":null,"abstract":"<p>The paper discusses an optical layout for obtaining reduced X-ray oblique images, which can be useful for X-ray lithography problems. A special feature of the layout is the ability to illuminate the photomask at small grazing angles while recording images with minimal distortion. Using numerical simulations carried out for an X-ray laser with an operating wavelength of 13.9 nm, the spatial resolution and field of view of this system are found.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 7","pages":"244 - 249"},"PeriodicalIF":0.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186804","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
Solution to the Problem of the Evolution of a Weak Perturbation Induced at the Boundary of a Hot Coronal Loop in a Strong Magnetic Field 强磁场中热日冕环边界诱发的弱扰动演变问题解决方案
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-08-28 DOI: 10.3103/S1068335624600761
A. S. Frolova, D. I. Zavershinskii, N. E. Molevich
{"title":"Solution to the Problem of the Evolution of a Weak Perturbation Induced at the Boundary of a Hot Coronal Loop in a Strong Magnetic Field","authors":"A. S. Frolova,&nbsp;D. I. Zavershinskii,&nbsp;N. E. Molevich","doi":"10.3103/S1068335624600761","DOIUrl":"10.3103/S1068335624600761","url":null,"abstract":"<p>Magnetoacoustic waves are actively used as a means of diagnosing plasma parameters and processes occurring in it. In this paper, we study the problem of the evolution of a weak perturbation specified at the base of a coronal loop. The analysis is carried out under the assumption that the plasma is in a strong magnetic field, such that the evolution of slow magnetoacoustic and entropy modes can be described within the framework of gas dynamics equations with a high degree of accuracy. The spectrum of the waves in question is assumed to be such that the main source of dispersion and dissipation of the waves is the thermal conduction of the medium. Within the framework of the specified approximations, an exact solution to the boundary value problem for the linear evolution equation is found using the Fourier method and Duhamel’s principle. The obtained exact analytical solution can be used to interpret the observation results, as well as numerical modeling of slow magnetoacoustic and entropy waves in the solar corona.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 7","pages":"233 - 239"},"PeriodicalIF":0.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186803","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
Electrical Parameters of a Piezoelectric Transformer-Generated Nanosecond Spark Discharge in Air 压电变压器在空气中产生的纳秒火花放电的电气参数
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-08-28 DOI: 10.3103/S1068335624600359
K. V. Artem’ev, D. V. Malakhov, L. V. Kolik, A. M. Davydov, N. G. Gusein-zade
{"title":"Electrical Parameters of a Piezoelectric Transformer-Generated Nanosecond Spark Discharge in Air","authors":"K. V. Artem’ev,&nbsp;D. V. Malakhov,&nbsp;L. V. Kolik,&nbsp;A. M. Davydov,&nbsp;N. G. Gusein-zade","doi":"10.3103/S1068335624600359","DOIUrl":"10.3103/S1068335624600359","url":null,"abstract":"<p>We study electrical parameters of nanosecond spark discharges generated by a piezoelectric transformer. The spark is generated in a 3 mm long air gap between the output (high-voltage) end of the piezoelectric transformer and an ungrounded metal cylinder (<i>h</i> = 12.3 mm and <i>D</i> = 8.6 mm). The active power consumed by the discharges (average over the period) and the energy input are estimated, a current oscillogram is obtained, and the air gap voltage versus time is plotted.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 7","pages":"262 - 267"},"PeriodicalIF":0.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186805","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
Study of Differences in the Dispersion of Transverse Harmonics of Slow Magnetoacoustic Waves Propagating in Coronal Loops 研究在日冕环路中传播的慢磁声波横向谐波的频散差异
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-08-28 DOI: 10.3103/S1068335624600633
D. V. Agapova, S. A. Belov, D. I. Zavershinskii, N. E. Molevich
{"title":"Study of Differences in the Dispersion of Transverse Harmonics of Slow Magnetoacoustic Waves Propagating in Coronal Loops","authors":"D. V. Agapova,&nbsp;S. A. Belov,&nbsp;D. I. Zavershinskii,&nbsp;N. E. Molevich","doi":"10.3103/S1068335624600633","DOIUrl":"10.3103/S1068335624600633","url":null,"abstract":"<p>The paper examines differences in the phase speed dispersion of transverse harmonics of slow magnetoacoustic (MA) waves propagating inside coronal loops along magnetic field lines. Using the magnetic slab approximation for conditions corresponding to the solar corona plasma, the dependencies of the phase speeds of the first four transverse harmonics of slow MA waves on their periods are calculated. It is shown that the greatest differences are between the fundamental transverse harmonic and the higher harmonics in the region of short periods. With an increase in the ratio of gas-dynamic pressure to magnetic pressure (plasma beta), the effect manifests itself for higher values of periods. The current resolution of the instruments does not allow higher-order transverse harmonics to be distinguished based on wave dispersion data.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 7","pages":"227 - 232"},"PeriodicalIF":0.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186640","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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