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

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Comparative Analysis of Theoretical and Experimental Interaction Cross-Sections of Deuteron and Enriched Lead 204Pb, 206Pb, 207Pb, and 208Pb 氘与富集铅204Pb、206Pb、207Pb、208Pb相互作用截面的理论与实验对比分析
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020093
S. Gaginyan
{"title":"Comparative Analysis of Theoretical and Experimental Interaction Cross-Sections of Deuteron and Enriched Lead 204Pb, 206Pb, 207Pb, and 208Pb","authors":"S. Gaginyan","doi":"10.1134/S1068337223020093","DOIUrl":"10.1134/S1068337223020093","url":null,"abstract":"<p>The modeling calculation of cross-sections of residual nuclei for isotopically enriched lead (<sup>204</sup>Pb, <sup>206</sup>Pb, <sup>207</sup>Pb, and <sup>208</sup>Pb) targets irradiated by 2.2 GeV/nucleon deuteron beam has been made by the Monte Carlo N-Particle Transport Code (MCNP). The experimental results were obtained on the Nuclotron of the Laboratory of High Energy Physics at the Joint Institute for Nuclear Research in Dubna. The production cross-sections of target fragments were determined for about 90 residual nuclei on each target mentioned above by the method of induced activity. The first-time irradiation has been made on the <sup>204</sup>Pb in the GeV range. The comparison of theoretical computations and experimental results showed good agreement between the experiment and simulation data.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"112 - 116"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4577584","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
Contribution of the Interference of the O7–O8 for the B → Xsγγ Decay O7-O8干涉对B→Xsγγ衰变的贡献
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020044
H. H. Asatryan, H. M. Asatrian, S. A. Tumasyan
{"title":"Contribution of the Interference of the O7–O8 for the B → Xsγγ Decay","authors":"H. H. Asatryan,&nbsp;H. M. Asatrian,&nbsp;S. A. Tumasyan","doi":"10.1134/S1068337223020044","DOIUrl":"10.1134/S1068337223020044","url":null,"abstract":"<p>Rare decays of <i>B</i>-mesons allow one the investigation of physics outside of the SM. For <span>(B to {{X}_{s}}{{gamma gamma }})</span> processes, the potential new physics should be visible not only for the width of the decay but also in the differential distributions for the parameters <span>(({{s}_{1}},{{s}_{2}}))</span>, defined as <span>({{s}_{i}} = {{({{p}_{b}} - {{q}_{i}})}^{2}}{text{/}}m_{b}^{2})</span>, (<i>i</i> = 1, 2), where <span>({{p}_{b}})</span>, <span>({{q}_{1}},{{q}_{2}})</span> are the momenta of the b-quark and the two photons. In this work, the contribution of the order <span>({{{{alpha }}}_{s}})</span> of the interference of the operators <span>({{O}_{7}} - {{O}_{8}})</span> was calculated. We also consider the dependence of the results from the mass of the s-quark by changing <span>({{m}_{s}})</span> in the range of 400–600 MeV. The contribution of the interference of the operators <span>({{O}_{7}} - {{O}_{8}})</span> into the width of the decay <span>(B to {{X}_{s}}{{gamma gamma }})</span> in the regions of the phase space considered is equal to 2–3%.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"117 - 121"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4574732","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
Signal-to-Noise Ratio of the Thermoelectric Single-Photon Detector with CeB6 Sensor and Bi-2223 Absorber CeB6传感器和Bi-2223吸收体热电单光子探测器的信噪比
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020123
A. A. Kuzanyan, A. S. Kuzanyan, V. R. Nikoghosyan, V. T. Tatoyan, V. S. Kuzanyan, S. R. Harutyunyan, G. Ts. Kharatyan, G. R. Badalyan
{"title":"Signal-to-Noise Ratio of the Thermoelectric Single-Photon Detector with CeB6 Sensor and Bi-2223 Absorber","authors":"A. A. Kuzanyan,&nbsp;A. S. Kuzanyan,&nbsp;V. R. Nikoghosyan,&nbsp;V. T. Tatoyan,&nbsp;V. S. Kuzanyan,&nbsp;S. R. Harutyunyan,&nbsp;G. Ts. Kharatyan,&nbsp;G. R. Badalyan","doi":"10.1134/S1068337223020123","DOIUrl":"10.1134/S1068337223020123","url":null,"abstract":"<p>The results of the simulation of heat propagation processes in the multilayer detection pixel of a single-photon thermoelectric detector consisting of heat sink (Bi-2223), thermoelectric sensor (CeB<sub>6</sub>), absorber (Bi-2223), and antireflection layer (SiO<sub>2</sub>) arranged in series on sapphire substrate (Al<sub>2</sub>O<sub>3</sub>) are presented. The design of the detection pixel without an antireflection layer is also considered. Simulation of the processes of absorbed photons heat transfer is carried out based on the equation of heat propagation from a limited volume. The cases of absorption of photons with energies of 0.8–1000 eV in detection pixels with a surface of 4 and 1 µm<sup>2</sup>, different thicknesses of absorber and sensor at a fixed operating temperature of the detector of 9 K are studied. Temporal dependences of voltage arising on the sensor, the equivalent power of Johnson and phonon noise are investigated, the signal-to-noise ratio is calculated, and the ways to increase this parameter are proposed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"155 - 163"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4573296","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 Ultraviolet Irradiation Effect on the ZnO:Tb Thin Films Characteristics 紫外光照射对ZnO:Tb薄膜特性影响的研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020172
E. P. Zaretskaya, V. F. Gremenok, V. V. Malyutina-Bronskaya, A. S. Musayelyan, S. G. Petrosyan
{"title":"Study of Ultraviolet Irradiation Effect on the ZnO:Tb Thin Films Characteristics","authors":"E. P. Zaretskaya,&nbsp;V. F. Gremenok,&nbsp;V. V. Malyutina-Bronskaya,&nbsp;A. S. Musayelyan,&nbsp;S. G. Petrosyan","doi":"10.1134/S1068337223020172","DOIUrl":"10.1134/S1068337223020172","url":null,"abstract":"<p>Single phase and highly transparent ZnO:Tb films with a Tb concentration from 0.41 at% up to 0.78 аt% were formed on glass and silicon substrates by sol-gel deposition. The influence of ultraviolet radiation on the structural and photoelectric characteristics of <i>n</i>-ZnO:Tb/<i>n</i>-Si structures has been studied. The appearance of a photoelectric effect under the influence of a bias voltage and UV radiation (405 and 278 nm) was established, with an increase in photo effect when irradiated with shorter wavelength UV radiation (278 nm). It was shown that the concentration of the Tb<sup>3+</sup> dopant is the determining factor for increasing the UV photosensitivity of the structures. The experimentally established selective sensitivity of <i>n</i>-ZnO:Tb/<i>n</i>-Si structures to UV radiation with a wavelength of less than 405 nm demonstrates the possibility of their use in UV radiation detectors or sun-blind detectors.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"147 - 154"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4574722","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
Evaluating the Depth of Water Medium Probing Using a Magnetic-Field Radiofrequency Probe Based on a Single-Layer Flat Coil 基于单层扁平线圈的磁场射频探头对水介质探测深度的评价
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-07-14 DOI: 10.1134/S1068337223020111
S. A. Khachunts
{"title":"Evaluating the Depth of Water Medium Probing Using a Magnetic-Field Radiofrequency Probe Based on a Single-Layer Flat Coil","authors":"S. A. Khachunts","doi":"10.1134/S1068337223020111","DOIUrl":"10.1134/S1068337223020111","url":null,"abstract":"<p>The adequate depth of sensing the aquatic environment by a sensor based on a single-layer flat coil was studied. A radiofrequency sensor of the ~40–50 MHz range with a diameter of the sensitive element (a flat coil) of ~8 mm was used. Plastic cuvettes filled with distilled water placed in front of the sensor were used as the test medium, the number of which was sequentially increased. The frequency of the sensor was measured depending on the number of cuvettes placed in front of the sensor. The character of changes in the registered frequency of the sensor depending on the thickness of the aqueous layer selected as the medium was revealed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 2","pages":"179 - 183"},"PeriodicalIF":0.6,"publicationDate":"2023-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4576730","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
Entangled Field States in the Process of Nondegenerate Parametric Decay in an Optical Cavity 光学腔中非简并参量衰减过程中的纠缠场态
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-06-18 DOI: 10.1134/S1068337223010115
S. T. Gevorgyan, M. S. Gevorgyan
{"title":"Entangled Field States in the Process of Nondegenerate Parametric Decay in an Optical Cavity","authors":"S. T. Gevorgyan,&nbsp;M. S. Gevorgyan","doi":"10.1134/S1068337223010115","DOIUrl":"10.1134/S1068337223010115","url":null,"abstract":"<p>For the process of non-degenerate parametric decay in an optical cavity, where a photon with energy <i>ћ</i>ω<sub>3</sub> decays into two photons with energies <i>ћ</i>ω<sub>2</sub> and <i>ћ</i>ω<sub>1</sub>, where <i>ћ</i>ω<sub>3</sub> = <i>ћ</i>ω<sub>2</sub> + <i>ћ</i>ω<sub>1</sub>, the possibility of formation of entangled field states in terms of photon number variables between interacting modes of the optical system is investigated. Strong entangled states are shown between the modes with frequencies ω<sub>2</sub> and ω<sub>1</sub> in the case of strong coupling between interacting modes. In the case of weak and very strong coupling between these modes, relatively weak entangled states are formed. In the case of weak coupling, these modes are localized in entangled vacuum states with low values of quantum entropy. For modes with frequencies ω<sub>3</sub> and ω<sub>1</sub>etangled states are formed only in the case of strong coupling.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 1","pages":"52 - 58"},"PeriodicalIF":0.6,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4725854","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
Spectral Study of the Binding of TMetAlPyP3 and ZnTMetAlPyP3 Porphyrins to DNA TMetAlPyP3和ZnTMetAlPyP3卟啉与DNA结合的光谱研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-06-18 DOI: 10.1134/S106833722301005X
L. R. Aloyan, A. A. Avetisyan
{"title":"Spectral Study of the Binding of TMetAlPyP3 and ZnTMetAlPyP3 Porphyrins to DNA","authors":"L. R. Aloyan,&nbsp;A. A. Avetisyan","doi":"10.1134/S106833722301005X","DOIUrl":"10.1134/S106833722301005X","url":null,"abstract":"<p>In this work, according to the data obtained from the induced circular dichroism spectra, the studied porphyrin binds to DNA by the intercalation method, and its Zn-containing analog by the externally ordered interaction was revealed. The absorption spectra of the studied complexes were obtained at different DNA concentrations, and the binding parameters (<i>K</i><sub>b</sub>, <i>n</i>) of porphyrins with DNA were computed from the data at two values of the ionic strength of the solution. It is shown that the places for binding porphyrins become less accessible at a higher ionic strength of the solution. An increase in the melting temperature of DNA in the presence of a metal-containing porphyrin is also observed, as well as a decrease in the stabilizing effect of porphyrins for an increase in the ionic strength of the solution.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 1","pages":"99 - 103"},"PeriodicalIF":0.6,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4723324","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
Investigations of Atomic Transitions of the D2 Line of Potassium in Strong Magnetic Fields Using Saturated Absorption Technique in a Microcell 用微电池饱和吸收技术研究强磁场下钾离子D2线的原子跃迁
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-06-18 DOI: 10.1134/S1068337223010176
A. D. Sargsyan
{"title":"Investigations of Atomic Transitions of the D2 Line of Potassium in Strong Magnetic Fields Using Saturated Absorption Technique in a Microcell","authors":"A. D. Sargsyan","doi":"10.1134/S1068337223010176","DOIUrl":"10.1134/S1068337223010176","url":null,"abstract":"<p>Atomic transitions of <sup>39</sup>K, D<sub>2</sub> line are studied in strong longitudinal magnetic fields, up to 1000 G, with a high spectral resolution. The saturated absorption (SA) method was used in a micro-cell filled with K vapors with a thickness of <i>L</i>= 30 µm. A double differentiation of the SA spectrum was carried out, which made it possible to obtain narrow (~50 MHz) atomic lines and study individual transition frequency and probabilistic behavior. Among alkali metals, the K atoms have the smallest hyperfine splitting of the ground levels. This allows one to observe the break of the coupling between the electronic total angular momentum <b>J</b> and nuclear <b>I</b> angular momentums at relatively low magnetic fields <i>B</i> &gt; 300 G. In the case of using circularly polarized radiation (σ<sup>+</sup> or σ<sup>–</sup>), two groups (each consisting of four) equidistantly located total eight atomic transitions are recorded in strong magnetic fields. The experimental results are well described by a known theoretical model.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 1","pages":"45 - 51"},"PeriodicalIF":0.6,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4723323","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
Equielliptical State of Light Polarization in Twist-Oriented Nematic Liquid Crystal 扭取向向列液晶中光偏振的等椭圆态
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-06-18 DOI: 10.1134/S1068337223010073
L. Aslanyan, A. Ayvazyan
{"title":"Equielliptical State of Light Polarization in Twist-Oriented Nematic Liquid Crystal","authors":"L. Aslanyan,&nbsp;A. Ayvazyan","doi":"10.1134/S1068337223010073","DOIUrl":"10.1134/S1068337223010073","url":null,"abstract":"<p>A systematic analysis of the spatial dynamics of the elliptically polarized light in a medium with the local inhomogeneity of the optical axis on the Poincare sphere has been carried out. A nematic liquid crystal with a twist orientation was considered such a medium. The existence of two special types of elliptically polarized waves is shown, which propagate in such a medium with a constant value of ellipticity, and the azimuth angle follow the rotation of the optical axis. The main features of the dependence on the sample thickness are revealed. For the analysis, we used the analytical solution of the system of coupled equations for the Cartesian components of the electric component of the light wave, obtained by passing to the rotating coordinate system.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 1","pages":"59 - 66"},"PeriodicalIF":0.6,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4723325","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 the MWCNT/SnO2 Sensor for the Detection of Acetone Vapors 用于丙酮蒸气检测的MWCNT/SnO2传感器的研究
IF 0.6 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-06-18 DOI: 10.1134/S1068337223010048
M. S. Aleksanyan, G. H. Shahkhatuni, E. A. Khachaturyan, G. E. Shahnazaryan, A. G. Sayunts, H. R. Hovhannisyan, D. A. Kananov
{"title":"Investigation of the MWCNT/SnO2 Sensor for the Detection of Acetone Vapors","authors":"M. S. Aleksanyan,&nbsp;G. H. Shahkhatuni,&nbsp;E. A. Khachaturyan,&nbsp;G. E. Shahnazaryan,&nbsp;A. G. Sayunts,&nbsp;H. R. Hovhannisyan,&nbsp;D. A. Kananov","doi":"10.1134/S1068337223010048","DOIUrl":"10.1134/S1068337223010048","url":null,"abstract":"<p>A sensor for the detection of acetone vapors based on the nanocomposite multiwalled carbon nanotubes/tin oxide (MWCNT/SnO<sub>2</sub>) material was manufactured by the hydrothermal synthesis method. The response of the MWCNT/SnO<sub>2</sub> sensor toward acetone vapors from room temperature to 300°C was investigated. The gas sensing characteristics of the MWCNT/SnO<sub>2</sub> sensor were investigated in the presence of different concentrations of acetone vapors (400 ppb–20 ppm) at an operating temperature of 250°C. At the same temperature, the impedance characteristics of the MWCNT/SnO<sub>2</sub> sensor were investigated both before and after exposure to acetone vapor. An equivalent electrical circuit for the MWCNT/SnO<sub>2</sub> sensor structure was proposed. The presented results indicate that the MWCNT/SnO<sub>2</sub> structure can detect very low acetone concentrations.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 1","pages":"67 - 72"},"PeriodicalIF":0.6,"publicationDate":"2023-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4727275","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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