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Journal of Contemporary Physics (Armenian Academy of Sciences)

Subject Areas: Physics and Astronomy (miscellaneous)
Publisher: Pleiades Publishing - Springer Journals
ISSN: 1068-3372
SJR: 11

LitStream

Journal Article

Experimental Installation Based on LPMWPC and SSD Detectors for Registration and Identification of Alpha Particles and Fission Fragments

Balabekyan, A. R.; Hovhannisyan, G. H.; Gaginyan, S. V.; Ayvazyan, G. M.; Zohrabyan, H. G.; Khachatryan, V. H.; Vardanyan, H. S.; Margaryan, A. T.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040060

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 226Ra were detected. The device has...
LitStream

Journal Article

Comparison of Gamma Activation Analysis and Instrumental Neutron Activation Analysis of Geological Samples

Aleksanyan, A. Y.; Amirkhanyan, S. M.; Aperyan, A. G.; Gulkanyan, H. R.; Kotanjyan, T. V.; Levonyan, M. A.; Pogosov, V. S.; Poghosyan, L. A.; Saakov, A. S.; Shahinyan, A. A.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040023

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...
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Journal Article

On Modernization of the LEE-75 Linear Electron Accelerator of the AANL (YerPhI)

Vahradyan, L. R.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040187

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...
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Journal Article

Helical Vacuum Currents for a Scalar Field in Models with Nontrivial Spatial Topology

Saharian, A. A.; Simonyan, D. H.; Mikayelyan, H. H.; Vantsyan, A. A.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040151

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...
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Journal Article

Vector Non-Stationary Electromagnetic Diffraction Fields and Fields of Charges in Media

Balyan, M. K.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040072

Vector non-stationary diffraction electromagnetic fields and fields of charges in an arbitrarily chosen volume in both homogeneous and inhomogeneous media are considered. These formulas are presented in two forms, each of which has its advantages in applications. The generalization of the...
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Journal Article

Absorptive Atom Interferometer

Muradyan, A. Zh.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040138

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...
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Journal Article

Narrow-Band Terahertz Pulse Generation in Lithium Niobate Crystal Using Phase Mask

Avetisyan, Y. H.; Makaryan, A. H.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040047

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)...
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Journal Article

Photoinduced Local Lattice Vibrations in a Ruby Crystal under Optical Pumping of the 2T1 State

Arakelyan, V. S.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040035

The oscillatory behavior of a heavy substitutional impurity (Cr3+) in Al2O3 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 R1 and R2 at room temperature depending on...
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Journal Article

Absorption of Hypersonic Waves in Doped Lithium Niobate Single Crystals

Yeganyan, A. V.; Kokanyan, N. E.; Kokanyan, E. P.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040199

Within the frameworks of the defect isotopic model, new expressions for the rapid estimation of the absorption coefficients of longitudinal and transverse hypersonic waves in the alloyed lithium niobate single crystals in the Akhiezer regime have been obtained. It is shown that the introduction...
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Journal Article

Formation of Luminescence Bands of Ce3+ Ions in YAG:Ce Crystals

Butaeva, T. I.; Hovhannesyan, K. L.; Yeganyan, A. V.

2023 Journal of Contemporary Physics (Armenian Academy of Sciences)

doi:10.1134/s1068337223040084

The spectral features and structural factors influencing the formation of luminescence bands of Ce3+ ions in YAG:Ce crystals are considered. The energy levels of the 4f shell of Ce3+ ions occupying both dodecahedral and octahedral sites of the crystal lattice have been determined. The...

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