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On Modernization of the LEE-75 Linear Electron Accelerator of the AANL (YerPhI) 关于美国国家实验室（AANL）LEE-75 直线电子加速器的现代化（YerPhI
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/S1068337223040187
L. R. Vahradyan
{"title":"On Modernization of the LEE-75 Linear Electron Accelerator of the AANL (YerPhI)","authors":"L. R. Vahradyan","doi":"10.1134/S1068337223040187","DOIUrl":"10.1134/S1068337223040187","url":null,"abstract":"<p>Briefly presented the scientific and technical state of the linear accelerator complex of the A. Alikhanyan National Scientific Laboratory. LUE-75 after renovation work carried out in recent years. The need for further modernization of the accelerator’s main systems to ensure its long scientific life is substantiated. An analysis of the state of individual nodes and systems of the accelerator and calculations have been carried out, based on which modernization is proposed by the introduction of modern technology. The use of new-generation power electronics, vacuum equipment with a modern interface, and a thermostabilization system is offered.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"333 - 340"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056260","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
Pair-Interacting Heavy Holes Gas in a Strongly Prolate Ellipsoidal Quantum Dot: Thermodynamic Properties 强椭球量子点中的成对相互作用重空穴气体：热力学性质
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/S1068337223040126
M. A. Mkrtchyan, Y. S. Mamasakhlisov, H. A. Sarkisyan
{"title":"Pair-Interacting Heavy Holes Gas in a Strongly Prolate Ellipsoidal Quantum Dot: Thermodynamic Properties","authors":"M. A. Mkrtchyan,&nbsp;Y. S. Mamasakhlisov,&nbsp;H. A. Sarkisyan","doi":"10.1134/S1068337223040126","DOIUrl":"10.1134/S1068337223040126","url":null,"abstract":"<p>A somewhat partial pair-interacting gas of heavy holes localized in a highly elongated ellipsoidal Ge/Si quantum dot has been studied in the adiabatic approximation. The interparticle interaction potential is considered within the one-dimensional Moshinsky atom model when the interaction depends on the square of the distance between particles. Within the framework of the Boltzmann approximation, the statistical sum of a somewhat partial hole gas is analytically calculated. The main thermodynamic parameters of the system, such as average energy, free energy, entropy, and heat capacity have been investigated. It is shown that taking into account interparticle interaction results in the ordering of the system, which, in particular, affects the entropy of the gas.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"391 - 396"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056133","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
Formation of Luminescence Bands of Ce3+ Ions in YAG:Ce Crystals YAG:Ce 晶体中 Ce3+ 离子发光带的形成
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/S1068337223040084
T. I. Butaeva, K. L. Hovhannesyan, A. V. Yeganyan
{"title":"Formation of Luminescence Bands of Ce3+ Ions in YAG:Ce Crystals","authors":"T. I. Butaeva,&nbsp;K. L. Hovhannesyan,&nbsp;A. V. Yeganyan","doi":"10.1134/S1068337223040084","DOIUrl":"10.1134/S1068337223040084","url":null,"abstract":"<p>The spectral features and structural factors influencing the formation of luminescence bands of Ce<sup>3+</sup> ions in YAG:Ce crystals are considered. The energy levels of the 4<i>f</i> shell of Ce<sup>3+</sup> ions occupying both dodecahedral and octahedral sites of the crystal lattice have been determined<i>.</i> The participation of Ce<sup>3+</sup> ions and <span>({text{Ce}}_{{{text{Al}}}}^{{3 + }})</span> ions in the structure of the luminescence band was shown and the multicenter structure of Ce<sup>3+</sup> ions in the 4<i>f</i> ↔ 5<i>d</i> transitions of the activator was determined.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"378 - 384"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056256","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
Possibilities of Creating X-Ray Acoustic Elements from Bi-Phthalate Family Crystals with Thickness Vibrations 利用邻苯二甲酸二脂族晶体的厚度振动制造 X 射线声学元件的可能性
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040096
Ya. A. Eliovich, V. R. Kocharyan, A. E. Blagov, A. V. Targonsky, V. A. Korzhov, A. E. Movsisyan, A. V. Shahverdyan, S. N. Noreyan, A. G. Mkrtchyan, M. V. Kovalchuk
{"title":"Possibilities of Creating X-Ray Acoustic Elements from Bi-Phthalate Family Crystals with Thickness Vibrations","authors":"Ya. A. Eliovich,&nbsp;V. R. Kocharyan,&nbsp;A. E. Blagov,&nbsp;A. V. Targonsky,&nbsp;V. A. Korzhov,&nbsp;A. E. Movsisyan,&nbsp;A. V. Shahverdyan,&nbsp;S. N. Noreyan,&nbsp;A. G. Mkrtchyan,&nbsp;M. V. Kovalchuk","doi":"10.1134/S1068337223040096","DOIUrl":"10.1134/S1068337223040096","url":null,"abstract":"<p>Peculiarities of X-ray beam diffraction from potassium and rubidium bi-phthalate piezo crystals under the condition of excitation of transverse ultrasonic vibrations are investigated. Previously, under a similar influence in quartz crystals, the effect of X-ray acoustic redistribution was observed, in which the intensity of diffracted radiation in the exact Bragg position increases significantly with a simultaneous decrease in the intensity of the transmitted beam, down to zero for certain parameters for reflecting atomic planes, called the full pumping effect. This effect can be used for controlled tuning of the diffracted beam intensity. In this work, to search for new materials for the creation of elements that allow such a rearrangement, we studied the dependences of the degree of amplification of diffracted radiation on the amplitude of the control signal for potassium and rubidium bi-phthalates crystals. The actual possibility of X-ray intensity modulation using transverse vibrations in these crystals is demonstrated.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"405 - 409"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056036","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
Absorptive Atom Interferometer 吸收原子干涉仪
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/S1068337223040138
A. Zh. Muradyan
{"title":"Absorptive Atom Interferometer","authors":"A. Zh. Muradyan","doi":"10.1134/S1068337223040138","DOIUrl":"10.1134/S1068337223040138","url":null,"abstract":"<p>A new type of atomic interferometer in which the registration is carried out by absorption spectroscopy of probing radiation is theoretically presented. To split the input atomic beam, the interaction with counterpropagating resonant waves is used. In addition, the atom also acquires equal populations at internal energy levels. The interaction with the subsequent traveling wave results in the interference between neighboring momentum states of the atom, and the distribution periodically varies with a strong asymmetry relative to the input momentum value. At the measurement stage, the result of the interference of matter waves is reproduced by the spectral distribution of the probing electromagnetic wave.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"355 - 361"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056032","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 Installation Based on LPMWPC and SSD Detectors for Registration and Identification of Alpha Particles and Fission Fragments 基于 LPMWPC 和 SSD 探测器的实验装置，用于登记和识别阿尔法粒子和裂变碎片
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/S1068337223040060
A. R. Balabekyan, G. H. Hovhannisyan, S. V. Gaginyan, G. M. Ayvazyan, H. G. Zohrabyan, V. H. Khachatryan, H. S. Vardanyan, A. T. Margaryan
{"title":"Experimental Installation Based on LPMWPC and SSD Detectors for Registration and Identification of Alpha Particles and Fission Fragments","authors":"A. R. Balabekyan,&nbsp;G. H. Hovhannisyan,&nbsp;S. V. Gaginyan,&nbsp;G. M. Ayvazyan,&nbsp;H. G. Zohrabyan,&nbsp;V. H. Khachatryan,&nbsp;H. S. Vardanyan,&nbsp;A. T. Margaryan","doi":"10.1134/S1068337223040060","DOIUrl":"10.1134/S1068337223040060","url":null,"abstract":"<p>The article describes a new detector, a volume filled with hexane at low pressure (3 Torr), containing multi-wire proportional chambers and a silicon semiconductor detector. Using this setup, alpha particles emitted during the decay of the radioactive isotope <sup>226</sup>Ra were detected. The device has an energy resolution of ≤ 5% and allows measuring the ionization energy losses of alpha particles as well. Thus, the LPMWPC and SSD-based experimental setup is a good tool for studying both binary and ternary fission of heavy nuclei, in which the third fragment is a high-energy alpha particle.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"321 - 325"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056035","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
Hierarchical Antireflective Surface of Silicon Substrates for Tandem Solar Cells 用于串联太阳能电池的硅基板分层抗反射表面
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/S1068337223040059
G. Y. Ayvazyan
{"title":"Hierarchical Antireflective Surface of Silicon Substrates for Tandem Solar Cells","authors":"G. Y. Ayvazyan","doi":"10.1134/S1068337223040059","DOIUrl":"10.1134/S1068337223040059","url":null,"abstract":"<p>The structural and optical properties of tandem silicon/perovskite structures with a hierarchical antireflective surface at the interface have been studied. The surface consisted of micro-sized pyramids and nano-sized short needles formed respectively by chemical and reactive ion etching of silicon substrates. It is shown that a perovskite film without pores and voids covers a hierarchical surface with high conformity. The manufactured samples are characterized by low reflectance over a wide range of radiation wavelengths.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"410 - 414"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056038","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
Comparison of Gamma Activation Analysis and Instrumental Neutron Activation Analysis of Geological Samples 地质样品伽马活化分析与仪器中子活化分析的比较
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/S1068337223040023
A. Y. Aleksanyan, S. M. Amirkhanyan, A. G. Aperyan, H. R. Gulkanyan, T. V. Kotanjyan, M. A. Levonyan, V. S. Pogosov, L. A. Poghosyan, A. S. Saakov, A. A. Shahinyan
{"title":"Comparison of Gamma Activation Analysis and Instrumental Neutron Activation Analysis of Geological Samples","authors":"A. Y. Aleksanyan,&nbsp;S. M. Amirkhanyan,&nbsp;A. G. Aperyan,&nbsp;H. R. Gulkanyan,&nbsp;T. V. Kotanjyan,&nbsp;M. A. Levonyan,&nbsp;V. S. Pogosov,&nbsp;L. A. Poghosyan,&nbsp;A. S. Saakov,&nbsp;A. A. Shahinyan","doi":"10.1134/S1068337223040023","DOIUrl":"10.1134/S1068337223040023","url":null,"abstract":"<p>For the first time in Armenia, gamma activation analysis of geological samples of obsidian was carried out using beams of bremsstrahlung photons at the linear electron accelerator of the A. Alikhanyan National Scientific Laboratory (AANL). It is shown that the results of the chemical composition of the obsidian sample are comparable with the results of instrumental neutron activation analysis (INAA) of the same sample, carried out at the Curt-Engelhom-Center for Archaeometry (Mannheim, Germany), after irradiation with neutrons in a specialized nuclear reactor TRIGA at the Institute of Nuclear Chemistry of the Mainz University. It is also shown that gamma activation analysis makes it possible to determine the content of a number of elements for which the use of INAA is impossible or difficult.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"326 - 332"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056130","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 Nanostructured Fe2O3:ZnO Sensor by Impedance Spectroscopy 利用阻抗光谱学研究纳米结构的 Fe2O3:ZnO 传感器
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/S1068337223040175
G. H. Shahkhatuni
{"title":"Investigation of Nanostructured Fe2O3:ZnO Sensor by Impedance Spectroscopy","authors":"G. H. Shahkhatuni","doi":"10.1134/S1068337223040175","DOIUrl":"10.1134/S1068337223040175","url":null,"abstract":"<p>A sensor sensitive to hydrogen peroxide vapor based on Fe<sub>2</sub>O<sub>3</sub>:ZnO (80 : 20 wt %) nanostructured film was studied. Investigation of the Fe<sub>2</sub>O<sub>3</sub>:ZnO sensor has been carried out by impedance spectroscopy. Based on the analysis of the frequency dependences of the real and imaginary parts of the complex impedance, the equivalent electrical circuit for the studied sensor structure was proposed, the parameters of its constituent elements were estimated, and approximating curves were computed. Scanning electron microscopy (SEM) images of the Fe<sub>2</sub>O<sub>3</sub>:ZnO film showed a nanoparticle structure. This type of sensor can be used in alternating signal-based detectors for sensing the hydrogen peroxide vapors, at the same time the sensor must be tuned to achieve maximum sensitivity by selecting an appropriate operating frequency range.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"385 - 390"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056257","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
Interaction of Serum Albumin with Erythrosine B under the Influence of Millimeter-Range Electromagnetic Waves 毫米范围电磁波影响下血清白蛋白与赤藓红 B 的相互作用
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/S106833722304014X
M. A. Parsadanyan, M. A. Shahinyan, S. V. Grigoryan, M. S. Mikaelyan, G. H. Poghosyan, V. P. Kalantaryan, P. O. Vardevanyan
{"title":"Interaction of Serum Albumin with Erythrosine B under the Influence of Millimeter-Range Electromagnetic Waves","authors":"M. A. Parsadanyan,&nbsp;M. A. Shahinyan,&nbsp;S. V. Grigoryan,&nbsp;M. S. Mikaelyan,&nbsp;G. H. Poghosyan,&nbsp;V. P. Kalantaryan,&nbsp;P. O. Vardevanyan","doi":"10.1134/S106833722304014X","DOIUrl":"10.1134/S106833722304014X","url":null,"abstract":"<p>The interaction of nutritional preservative and dye erythrosine B with bovine serum albumin (BSA) under the influence of millimeter range electromagnetic waves (MM EMW) with frequencies 41.8 and 51.8 GHz has been studied by the UV-denaturation and spectroscopic methods (absorption, fluorescence, and circular dichroism (CD)). We show that the irradiation by MM EMW with the frequency 51.8 GHz stabilizes the complex BSA-erythrosine B. At the same time, denaturation parameters of the complex at the irradiation of BSA solution with the frequency 41.8 GHz do not differ from those obtained for non-irradiated samples within the limits of experimental error. We also show that under the influence of the irradiation by 51.8 GHz frequency there is no conformational change of BSA. However, a change in the protein conformation takes place in the case of the complex BSA-erythrosine B. In addition, the complex-formation process is thermodynamically beneficial and implemented because of the additional hydrogen bonds and van-der-Waals interaction between BSA and erythrosine B under the influence of MM EMW.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"428 - 434"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056259","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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