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Journal of Contemporary Physics (Armenian Academy of Sciences)最新文献

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A Prototype of Electromagnetic Calorimeter Constructed of Lead Tungstate 用钨酸铅制造的电磁量热计原型
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-09-09 DOI: 10.1134/S1068337224700026
H. Mkrtchyan, H. Marukyan, A. Mkrtchyan, A. Shahinyan, V. Tadevosyan, H. Voskanyan, A. Movsisyan, A. Hoghmrtsyan
{"title":"A Prototype of Electromagnetic Calorimeter Constructed of Lead Tungstate","authors":"H. Mkrtchyan,&nbsp;H. Marukyan,&nbsp;A. Mkrtchyan,&nbsp;A. Shahinyan,&nbsp;V. Tadevosyan,&nbsp;H. Voskanyan,&nbsp;A. Movsisyan,&nbsp;A. Hoghmrtsyan","doi":"10.1134/S1068337224700026","DOIUrl":"10.1134/S1068337224700026","url":null,"abstract":"<p>The article presents the results of studies of the characteristics of lead tungstate crystals (PbWO<sub>4</sub>). Measurements of light transmission and light output from the passage of cosmic muons were carried out. The average light transmittance of crystals in the transverse direction is 62.82, 68.38, and 75.68% at wavelengths λ = 360, 420, and 620 nm, and the light output is ~16 pe/MeV. A prototype of an electromagnetic calorimeter was designed and built from crystals arranged in a 4 × 4 matrix which has been tested by cosmic muons. The results obtained confirm the conclusions of other groups in the Electron-Ion Collider collaboration that the quality of the crystals produced by CRYTUR meets the requirements for an electromagnetic calorimeter, and that they can be the basis for its creation.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 1","pages":"11 - 16"},"PeriodicalIF":0.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175671","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
Investigation of Production Possibility of Medical Isotope 155Tb on Cyclotron C18/18 研究在回旋加速器 C18/18 上生产医用同位素 155Tb 的可能性
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-09-09 DOI: 10.1134/S1068337224700038
R. V. Avetisyan, A. G. Barseghyan, Yu. H. Gharibyan, A. V. Gyurjinyan, I. A. Kerobyan, H. A. Mkrtchyan, A. Yu. Petrosyan
{"title":"Investigation of Production Possibility of Medical Isotope 155Tb on Cyclotron C18/18","authors":"R. V. Avetisyan,&nbsp;A. G. Barseghyan,&nbsp;Yu. H. Gharibyan,&nbsp;A. V. Gyurjinyan,&nbsp;I. A. Kerobyan,&nbsp;H. A. Mkrtchyan,&nbsp;A. Yu. Petrosyan","doi":"10.1134/S1068337224700038","DOIUrl":"10.1134/S1068337224700038","url":null,"abstract":"<p>The results of the studies on the production of <sup>155</sup>Tb isotope, which is used in theranostic applications for oncological diseases, utilizing the proton beam of the medical cyclotron C18/18 are presented. The measurements of the induced activity were carried out using the activation method, followed by spectrometric analysis. Natural gadolinium was used as the main target. Excitation functions were calculated for the <sup>nat</sup>Gd(<i>p</i>, <i>xn</i>)<sup>155</sup>Tb reactions using TALYS 1.96 and EMPIRE 3.2 theoretical nuclear codes. The measured cross-section values were compared with the results of the theoretical calculations as well as with the experimental data from other works. The experimental value of the integral activity of the radionuclide <sup>155</sup>Tb was compared to the results obtained with the TALYS 1.96 code and with early published data.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 1","pages":"17 - 22"},"PeriodicalIF":0.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175746","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
Wettability of Black Silicon Layers Formed by Different Methods 不同方法形成的黑硅层的润湿性
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-09-09 DOI: 10.1134/S1068337224700105
G. Y. Ayvazyan, A. A. Vardanyan, A. V. Semchenko
{"title":"Wettability of Black Silicon Layers Formed by Different Methods","authors":"G. Y. Ayvazyan,&nbsp;A. A. Vardanyan,&nbsp;A. V. Semchenko","doi":"10.1134/S1068337224700105","DOIUrl":"10.1134/S1068337224700105","url":null,"abstract":"<p>The wettability of black silicon (b-Si) layers formed by reactive ion etching, metal-assisted chemical etching, and laser-induced etching has been studied. The wetting contact angles of the prepared samples with deionized water, glycerol, diiodomethane, and ethylene glycol were determined. It has been shown that the silicon oxide surface film and the enlargement area factor of b-Si layers have a significant influence on their wettability, varying from hydrophilic to hydrophobic properties.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 1","pages":"85 - 90"},"PeriodicalIF":0.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175752","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
Numerical Modeling of Cooling Processes of a Locally Inclined Target with a Nirta Solid Compact Target Module 利用 Nirta 固体紧凑型靶模块对局部倾斜靶的冷却过程进行数值建模
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-09-09 DOI: 10.1134/S1068337224700014
A. Avetisyan, R. Dallakyan, N. Dobrovolski, A. Grigoryan, A. Manukyan, A. Melkonyan, I. Sinenko
{"title":"Numerical Modeling of Cooling Processes of a Locally Inclined Target with a Nirta Solid Compact Target Module","authors":"A. Avetisyan,&nbsp;R. Dallakyan,&nbsp;N. Dobrovolski,&nbsp;A. Grigoryan,&nbsp;A. Manukyan,&nbsp;A. Melkonyan,&nbsp;I. Sinenko","doi":"10.1134/S1068337224700014","DOIUrl":"10.1134/S1068337224700014","url":null,"abstract":"<p>Locally inclined targets are developed to produce medical radioisotopes which can be used for high-intensity proton beam irradiation. The results of a numerical analysis of thermal processes in locally inclined targets made of pressed molybdenum powder with a niobium target holder for the Nirta Solid Compact Model TS06 target module are presented. Computations were carried out using the Fluid Flow (Fluent) engineering package of the ANSYS Workbench 18.2 software platform for variants of targets with linear and axially symmetric grooves in the proton irradiation zone. It has been shown that using various models of locally inclined targets with a cooling area increased by 2.37 times, it is possible to increase the irradiation current by 1.34–1.46 times compared to a standard flat target. An analysis of the distribution of heat flows and temperatures in the targets was also carried out.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 1","pages":"1 - 10"},"PeriodicalIF":0.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175745","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 Secondary X-Ray of Sterilization Setup Based on High-Current Pulse Electron Accelerator SINUS-320 基于大电流脉冲电子加速器 SINUS-320 的消毒装置二次 X 射线模拟
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-09-09 DOI: 10.1134/S106833722470004X
K. Afanasyev, R. Gaisin, V. Gauzshtein, Yu. Cherepennikov, M. Shevelev
{"title":"Simulation of Secondary X-Ray of Sterilization Setup Based on High-Current Pulse Electron Accelerator SINUS-320","authors":"K. Afanasyev,&nbsp;R. Gaisin,&nbsp;V. Gauzshtein,&nbsp;Yu. Cherepennikov,&nbsp;M. Shevelev","doi":"10.1134/S106833722470004X","DOIUrl":"10.1134/S106833722470004X","url":null,"abstract":"<p>The work presents a study of the parameters of secondary X-ray radiation generated during the operation of a sterilization setup based on a high-current pulse-periodic electron accelerator, SINUS-320. The energy of accelerated electrons equals to 500 keV. Therefore, the issues of radiation protection during the operation of the installation are highly topical, which results in the importance of studying the energy spectrum and dose rate of the secondary X-ray radiation. The studies were carried out by statistical simulation using the GEANT4 toolkit.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 1","pages":"23 - 27"},"PeriodicalIF":0.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175747","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
Generation of a New Type of Similaritons in Optical Fibers 在光纤中产生新型相似子
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-09-09 DOI: 10.1134/S1068337224700051
A. Kutuzyan, V. Avetisyan, M. Sukiasyan
{"title":"Generation of a New Type of Similaritons in Optical Fibers","authors":"A. Kutuzyan,&nbsp;V. Avetisyan,&nbsp;M. Sukiasyan","doi":"10.1134/S1068337224700051","DOIUrl":"10.1134/S1068337224700051","url":null,"abstract":"<p>Based on a detailed numerical analysis and comparison with experimental observations, a nonlinear process of the generation of a new type of similaritons in fibers is presented in the region of negative dispersion. These similaritons are needle-like in shape with a sharp top and a large base and are formed in passive single-mode optical fibers with weak nonlinearity and strong group velocity dispersion. Consistent boundary conditions are found for the parameters of the input pulse and the characteristics of the optical fiber under which such self-similarly propagating pulses are generated.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 1","pages":"36 - 40"},"PeriodicalIF":0.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142175751","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
Improving the Quality of X-Ray Images Formed by a Diffraction Lens from a Two-Block Crystalline System 提高双块晶体系统衍射透镜形成的 X 射线图像质量
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040205
L. A. Haroutunyan
{"title":"Improving the Quality of X-Ray Images Formed by a Diffraction Lens from a Two-Block Crystalline System","authors":"L. A. Haroutunyan","doi":"10.1134/S1068337223040205","DOIUrl":"10.1134/S1068337223040205","url":null,"abstract":"<p>The possibility of improving the quality of X-ray images formed using diffraction on a two-block crystalline system is considered. It is shown that the low spatial coherence of the initial radiation improves imaging quality. Conventional wide-focus X-ray tubes can be used as a source for such radiation. The feasibility of using a scanning scheme to reduce the background level in the formed image was also considered by numerical simulation.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"435 - 440"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056262","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
Photoinduced Local Lattice Vibrations in a Ruby Crystal under Optical Pumping of the 2T1 State 红宝石晶体在 2T1 态光学泵浦下的光诱导局部晶格振动
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040035
V. S. Arakelyan
{"title":"Photoinduced Local Lattice Vibrations in a Ruby Crystal under Optical Pumping of the 2T1 State","authors":"V. S. Arakelyan","doi":"10.1134/S1068337223040035","DOIUrl":"10.1134/S1068337223040035","url":null,"abstract":"<p>The oscillatory behavior of a heavy substitutional impurity (Cr<sup>3+</sup>) in Al<sub>2</sub>O<sub>3</sub> has been studied by the Brillouin scattering method. The oscillations of chromium ions are carried out by their photoexcitation. Discrete shifts of the ruby luminescence lines <i>R</i><sub>1</sub> and <i>R</i><sub>2</sub> at room temperature depending on the absorbed laser pump power upon excitation of the <sup>2</sup><i>T</i><sub>1</sub> state observed for the first time. These shifts are caused by the excitation of quasi-local vibrations of chromium ions. The frequency of quasi-local oscillations is equal to 22 GHz, which corresponds to transverse acoustic oscillations in ruby. An explanation of the observed phenomenon is given based on the Born–Oppenheimer adiabatic approximation and the Pekar function.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"369 - 374"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056039","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
Narrow-Band Terahertz Pulse Generation in Lithium Niobate Crystal Using Phase Mask 利用相位掩膜在铌酸锂晶体中产生窄带太赫兹脉冲
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040047
Y. H. Avetisyan, A. H. Makaryan
{"title":"Narrow-Band Terahertz Pulse Generation in Lithium Niobate Crystal Using Phase Mask","authors":"Y. H. Avetisyan,&nbsp;A. H. Makaryan","doi":"10.1134/S1068337223040047","DOIUrl":"10.1134/S1068337223040047","url":null,"abstract":"<p>Below, we theoretically study the generation of narrowband terahertz (THz) radiation by optical rectification in an artificial periodically poled lithium niobate (LN) crystal with a wide aperture. The latter is formed by placing a multi-slit phase mask in front of a conventional (single-domain) LN crystal. It is shown that the bandwidth of THz generation can be varied over a wide range by changing the linear size of the pump beam in the crystal. In addition, it is possible to tune up the generation frequency in the range of 0.4–0.8 THz by building a mask image in the crystal with different magnifications. According to estimates, the energy of narrowband THz pulses at a frequency of 0.5 THz in a stoichiometric LN crystal at a temperature of 100 K is about 265 μJ for a pump pulse energy of 220 mJ.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"362 - 368"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056078","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
Microwave–Assisted Synthesis of SiO2/ZnO Photocatalyst with Core-Shell Structure 微波辅助合成具有核壳结构的 SiO2/ZnO 光催化剂
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040163
A. A. Sargsyan, R. A. Mnatsakanyan, T. V. Grigoryan, A. A. Kazaryan, A. A. Petrosyan, V. V. Harutyunyan, A. O. Badalyan, N. R. Aghamalyan, V. V. Baghramyan
{"title":"Microwave–Assisted Synthesis of SiO2/ZnO Photocatalyst with Core-Shell Structure","authors":"A. A. Sargsyan,&nbsp;R. A. Mnatsakanyan,&nbsp;T. V. Grigoryan,&nbsp;A. A. Kazaryan,&nbsp;A. A. Petrosyan,&nbsp;V. V. Harutyunyan,&nbsp;A. O. Badalyan,&nbsp;N. R. Aghamalyan,&nbsp;V. V. Baghramyan","doi":"10.1134/S1068337223040163","DOIUrl":"10.1134/S1068337223040163","url":null,"abstract":"<p>The SiO<sub>2</sub>/ZnO nanocomposite with a core-shell structure for photocatalysis from water-soluble zinc salts and sodium silicate was synthesized using the hydrothermal-microwave method. The physicochemical properties of the synthesized SiO<sub>2</sub>/ZnO were studied and its photocatalytic activity was tested. The band gaps of the heat-treated composite <span>(E_{{text{g}}}^{{{text{dir}}}})</span> and <span>(E_{{text{g}}}^{{{text{indir}}}})</span> are 3.35 and 3.32 eV, respectively. The photocatalytic activity of the resulting SiO<sub>2</sub>/ZnO was determined by the decomposition reaction of methylene blue under UV irradiation. The conversion of methylene blue was determined by optical method. The resulting SiO<sub>2</sub>/ZnO has high photocatalytic activity. The conducted studies showed the effectiveness of microwave synthesis of SiO<sub>2</sub>/ZnO with a core-shell structure in comparison with traditional methods.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"397 - 404"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056258","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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