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Helical Vacuum Currents for a Scalar Field in Models with Nontrivial Spatial Topology 无空间拓扑模型中标量场的螺旋真空电流
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/S1068337223040151
A. A. Saharian, D. H. Simonyan, H. H. Mikayelyan, A. A. Vantsyan
{"title":"Helical Vacuum Currents for a Scalar Field in Models with Nontrivial Spatial Topology","authors":"A. A. Saharian,&nbsp;D. H. Simonyan,&nbsp;H. H. Mikayelyan,&nbsp;A. A. Vantsyan","doi":"10.1134/S1068337223040151","DOIUrl":"10.1134/S1068337223040151","url":null,"abstract":"<p>The vacuum expectation value of the current density for a massive scalar field in a (D + 1)-dimensional flat space-time with compact dimension is investigated. Along a compact dimension, the field operator obeys the helical quasiperiodicity condition with a constant phase. The results previously studied in the literature are obtained in the special case of a zero helicity parameter. In contrast to this case, the vacuum current, in addition to the component along the compact dimension, has a non-zero component in the direction of the non-compact dimension along which the field operator is shifted. A simple relation between these components is obtained. They are odd periodic functions of magnetic flux penetrating the compact dimension, with the period equal to the magnetic flux quantum. For a given non-zero value of the helicity parameter, the component of the vacuum current along the compact dimension tends to zero in the limit when the length of that dimension tends to zero. In the problem considered earlier with the usual quasiperiodic condition, the vacuum current diverges in that limit.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"341 - 348"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056261","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
Vacuum Window for IBA C18 Twin Cyclotron’s Beamline 用于 IBA C18 双回旋加速器光束线的真空窗
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/S1068337223040217
A. A. Manukyan
{"title":"Vacuum Window for IBA C18 Twin Cyclotron’s Beamline","authors":"A. A. Manukyan","doi":"10.1134/S1068337223040217","DOIUrl":"10.1134/S1068337223040217","url":null,"abstract":"<p>This article provides data on the development and creation of a vacuum window module, which will bring out the proton beam of the C18 cyclotron (IBA, Belgium) with energy of 18 MeV from a vacuum environment into the atmosphere. The module is made of aluminum and consists of a flange with a collimator and a helium (He) chamber of foil plates cooling. The module was installed at the end of the cyclotron’s beam line. Profile measurements were made for various current values of proton beam from 1 to 30 µA. The vacuum window showed its functionality.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"441 - 444"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056027","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
Application of a Drone in the On-Site Antenna Measurements of the Radar of an Ultrashort Meter Waveband 无人机在超短波波段雷达现场天线测量中的应用
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/S1068337223040114
M. V. Markosyan, A. H. Avetisyan, A. K. Aharonyan, H. G. Martirosyan, E. A. Harutyunyan, G. Z. Sughyan, R. A. Davtyan
{"title":"Application of a Drone in the On-Site Antenna Measurements of the Radar of an Ultrashort Meter Waveband","authors":"M. V. Markosyan,&nbsp;A. H. Avetisyan,&nbsp;A. K. Aharonyan,&nbsp;H. G. Martirosyan,&nbsp;E. A. Harutyunyan,&nbsp;G. Z. Sughyan,&nbsp;R. A. Davtyan","doi":"10.1134/S1068337223040114","DOIUrl":"10.1134/S1068337223040114","url":null,"abstract":"<p>The use of a drone as an aerial vehicle to realize the antenna measurement method is considered. The drone is controlled by software, using unified radio-electronic equipment containing a transmitter, a half-wave vibrator, and a GPS navigator. The parameters of the directional properties of the antenna system are the result of software processing of the output signals of the radar receiver synchronized with the coordinates of the drone flight path points.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"422 - 427"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056031","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
Platinum-Containing Detection Pixel of a Thermoelectric Single-Photon Detector 热电单光子探测器的含铂检测像素
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/S1068337223040102
A. A. Kuzanyan, V. R. Nikoghosyan, A. S. Kuzanyan
{"title":"Platinum-Containing Detection Pixel of a Thermoelectric Single-Photon Detector","authors":"A. A. Kuzanyan,&nbsp;V. R. Nikoghosyan,&nbsp;A. S. Kuzanyan","doi":"10.1134/S1068337223040102","DOIUrl":"10.1134/S1068337223040102","url":null,"abstract":"<p>Using computer simulation, the processes of heat propagation were studied and noise was determined in a three-layer detection pixel of a thermoelectric single-photon detector, consisting of an absorber (Pt), a thermoelectric sensor (La<sub>0.99</sub>Ce<sub>0.01</sub>B<sub>6</sub>) and a heat sink (Pt, Mo). The absorption of photons with energies of 0.8–7.1 eV (1550–175 nm) in absorbers of various thicknesses, providing high absorption efficiency, was studied. The simulation was based on the heat propagation equations from a limited volume. The temporal dependencies of the signal appearing on the sensor were studied. Signal power, noise equivalent power, and signal-to-noise ratio were determined. It was shown that a detection pixel with a platinum absorber can reliably detect single photons with the energy of 3.1–7.1 eV.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"415 - 421"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056255","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
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
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