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2022 год 

1.

Gravitational field of slightly deformed naked singularities

Toktarbay, S., Quevedo H., Abishev M., Muratkhan, A.

10.1140/epjc/s10052-022-10230-2

We derive a particular approximate solution of Einstein equations, describing the gravitational field of a mass distribution that slightly deviates from spherical symmetry. The deviation is described by means of a quadrupole parameter that is responsible for the appearance of a curvature singularity, which is not covered by a horizon. We investigate the motion of test particles in the gravWe derive a particular approximate solution of Einstein equations, describing the gravitational field of a mass distribution that slightly deviates from spherical symmetry. The deviation is described by means of a quadrupole parameter that is responsible for the appearance of a curvature singularity, which is not covered by a horizon. We investigate the motion of test particles in the gravitational field of this naked singularity and show that the quadrupole parameter affects the properties of Schwarzschild trajectories. By investigating radial geodesics, we find that no effects of repulsive gravity are present. We interpreted this result as indicating that repulsive gravity is non-linear effect.itational field of this naked singularity and show that the quadrupole parameter affects the properties of Schwarzschild trajectories. By investigating radial geodesics, we find that no effects of repulsive gravity are present. We interpreted this result as indicating that repulsive gravity is non-linear effect.

Toktarbay, S., Quevedo, H., Abishev, M., Muratkhan, A., “Gravitational field of slightly deformed naked singularities”, European Physical Journal C, 2022, 82(4), 382, Q2 10.1140/epjc/s10052-022-10230-2

2.

Reaction rate of radiative p¹²N capture

Dubovichenko S.B., Burkova N.A., Zazulin, D.M.

10.1016/j.nuclphysa.2022.122543

The S-factor of radiative p¹²N capture at energies from 20 keV to 5 MeV was considered within the modified potential cluster model with forbidden states, considering the first resonance at E_x = 2.69(5) MeV. It was shown that one can obtain the astrophysical S-factor based on potentials consistent with the bound state energies and asymptotic constant values. According to the theoretical total cross sections, the calculation of the p¹²N capture reaction rate is made at temperatures from 0.001 to 10 T₉. The calculated results for the reaction rate are approximated by analytical expression, which simplifies their use in applied research

Dubovichenko, S.B., Burkova, N.A., Zazulin, D.M., “Reaction rate of radiative p¹²N capture”, Nuclear Physics A, 2022, 1028, 122543, Q3, 10.1016/j.nuclphysa.2022.122543

3.

Reaction rate of radiative n⁶Li capture in the temperature range from 0.01 to 10 T₉

Dubovichenko S.B., Burkova N.A., Tkachenko A.S.

10.1016/j.nuclphysa.2022.122520

We consider the rate of radiative n⁶Li capture reaction in the temperature range from 0.01 to 10 T₉ within the framework of the modified potential cluster model with forbidden states. The total cross sections are calculated for capture to the ground, and the first excited states of the ⁷Li nucleus in the n⁶Li channel in the energy range from 10 meV to 5 MeV. Analytical expressions approximate the total cross-section at low energies and the reaction rate over the entire considered temperature range.

Dubovichenko, S.B., Burkova, N.A., Tkachenko, A.S., “Reaction rate of radiative n⁶Li capture in the temperature range from 0.01 to 10 T₉”, Nuclear Physics A, 2022, 1027, 122520,Q3 10.1016/j.nuclphysa.2022.122520

4.

Li 6 (p,γ) Be 7 reaction rate in the light of the new data of the Laboratory for Underground Nuclear Astrophysics

Dubovichenko S.B., Tkachenko A.S., Kezerashvili R.Y., Burkova N.A., Dzhazairov-Kakhramanov A.V.

10.1103/PhysRevC.105.065806

We present new calculations of the astrophysical S factor and reaction rate for the Li6(p,γ)Be7 reaction at energies of 10 keV to 5 MeV in the framework of a modified potential cluster model with forbidden states, including low lying resonances. The astrophysical S(E) factor is compared with the available experimental data and calculations done within different models. The results for the S factor are in good agreement with the data set (for E<0.3 MeV) and calculations (for E<0.6 MeV) of the LUNA Collaboration [Phys. Rev. C 102, 052802(R) (2020)2469-998510.1103/PhysRevC.102.052802]. The recommended extrapolated zero value S(0) turned out to be 101 eV b. Using the theoretical total cross sections, the Li6(p,γ)Be7 capture reaction rate is calculated at temperatures ranging from 0.01T9 to 10T9 and compared with NACRE and NACRE II. Analytical expressions for the S factor and reaction rate are given, and the effect of low-lying resonances on the reaction rate is estimated. We suggest updating the NACRE and NACRE II databases in light of the new LUNA data and present calculations.

Dubovichenko, S.B., Tkachenko, A.S., Kezerashvili, R.Y., Burkova, N.A., Dzhazairov-Kakhramanov, A.V., “Li 6 (p,γ) Be 7 reaction rate in the light of the new data of the Laboratory for Underground Nuclear Astrophysics”, Physical Review C, 2022, 105(6), 065806, 10.1103/PhysRevC.105.065806

5.

Reaction Rate of p ⁶Li Capture

Dubovichenko S.B., Burkova N.A., Dzhazairov-Kakhramanov A.V., Tkachenko A.S., Samratova A.

10.1007/s11182-022-02583-8

The radiative p⁶Li capture process has been treated within the framework of the modified potential cluster model with forbidden states at energies from 10 keV to 10 MeV with allowance for the first excitation energy resonance at excitation energies exceeding the p⁶Li channel threshold by 7.2 or 1.6 MeV. The experimental data on the astrophysical S-factor are well reproduced based on the interaction potentials relevant to the bound state energies and the corresponding asymptotic coefficients. Based on the total cross sections calculated at energies from 1 keV to 5 MeV, the reaction rates of p⁶Li radiative capture have been calculated at temperatures in the range from 0.01 to 10 T₉. The obtained reaction rates have been approximated by simple expressions easier to use in other works.

Dubovichenko, S.B., Burkova, N.A., Dzhazairov-Kakhramanov, A.V., Tkachenko, A.S., Samratova, A., “Reaction Rate of p ⁶Li Capture”, Russian Physics Journal, 2022, 64(12), стр. 2237–2245, Q4, 10.1007/s11182-022-02583-8

6.

Radiative p ¹¹C Capture Reaction Rate

Dubovichenko S.B., Burkova N.A., Shamitova R.R.

10.1007/s11182-022-02515-6

Within the frame of the modified potential cluster model with classification of orbital states according to Young’s diagrams, the astrophysical S-factor of radiative p¹¹C capture was calculated. The calculations considered all scattering resonances up to 3.5 MeV and were performed at energies up to 5 MeV. On the basis of the obtained total cross sections, the reaction rate was calculated at temperatures from 0.01 to 10.0 Т₉, and its simple parameterization was proposed

Dubovichenko, S.B., Burkova, N.A., Shamitova, R.R., Radiative p ¹¹C Capture Reaction Rate, Russian Physics Journal, 2022, 64(9), стр. 1741–1748, Q4, 10.1007/s11182-022-02515-6

7.

Rapidly rotating Dirac stars

Dzhunushaliev V., Folomeev V., Burtebayev N.

10.1103/PhysRevD.106.024021

Within general relativity, we construct sequences of rapidly rotating Dirac stars consisting of a spinor fluid described by an effective equation of state. We find the physically relevant domain of stable configurations and calculate their principal characteristics which are completely determined by the central density of the spinor fluid, the mass of the nonlinear spinor field, and the velocity of rotation. It is demonstrated that for a certain choice of the spinor field mass, the main physical characteristics of the Dirac stars are close to those that are typical of rotating neutron stars.

Dzhunushaliev, V., Folomeev, V., Burtebayev, N.,” Rapidly rotating Dirac stars”, Physical Review D, 2022, 106(2), 024021, Q1, 10.1103/PhysRevD.106.024021

8.

Proca balls with angular momentum or flux of electric field

Dzhunushaliev V., Folomeev V.

10.1103/PhysRevD.105.016022

Within SU(2) Higgs-Proca theory, we obtain a family of nontopological static solutions describing localized, finite-energy configurations (Proca balls). The gauge symmetry of the theory is explicitly broken by introducing a vector Proca field whose components have different masses. Such solutions describe particlelike systems, the crucial feature of which is that they either possess a nonzero total angular momentum or have a flux of electric field through the plane of symmetry of such objects. It is shown that the angular momentum is provided by static crossed electric and magnetic fields. The existence of the solutions is caused by the fact that we circumvent the conditions of the no-go theorem, according to which there are no stationary and axially symmetric spinning excitations for the 't Hooft-Polyakov monopoles, Julia-Zee dyons, sphalerons, and also vortices. The dependence of some integral physical quantities on the ratio of the Proca-field masses is studied. It is demonstrated that the inclusion of external sources (charges) enables one to obtain solutions with equal Proca-field masses. We also discuss the possibilities of using quarks as sources of the Proca field under investigation and for treating the Proca balls as glueballs in SU(2) Higgs-Proca theory.

Dzhunushaliev, V., Folomeev, V., “Proca balls with angular momentum or flux of electric field”, Physical Review D, 2022, 105(1), A32, Q1, 10.1103/PhysRevD.105.016022

9.

Features of Scattering by a Nonspherical Potential

Krassovitskiy P.M., Pen’kov F.M.

10.1134/S1063779622020447

 A model for solving the scattering problem by an axially symmetric potential has been developed. On the basis of this model, the interaction of the ²³⁸U isotope with a neutron has been studied. The correct accounting for the nonspherical shape of the uranium nucleus is accented. The optical potential has been used as the model. The spherically symmetric and nonspherical potentials are shown to result in different pictures of scattering, and, particularly, different resonance features of scattering. One of the directions of development of nuclear physics can be conditionally called extensive. Progress in the use of numerical methods leads to the necessity for the maximum possible account of all possible aspects of nuclear interactions, already known in principle. Relatively recently, the possibility of considering the nonspherical form of the nuclear interaction has been included in the software packages that allow calculating nuclear reactions, along with other necessary components [1, 2]. In the former work, the calculation of the interaction is based on the use of the TDHF approximation [3], in the latter, on the use of classical trajectories. On the one hand, the effect of nonsphericity is included in the code packages, while on the other hand, the calculation of the interaction is based on approximate, sometimes not even quantum-mechanical, schemes. In this study, we treat new effects arising from scattering by a nonspherical potential in the framework of quantum mechanics. As an example, one of the widely used reactions of nuclear power energetics was chosen—the interaction of a neutron with the nucleus of uranium-238. The interaction is described using an optical potential, which is one of the most popular simple potentials.

Krassovitskiy, P.M., Pen’kov, F.M., “Features of Scattering by a Nonspherical Potential”, Physics of Particles and Nuclei, 2022, 53(2), стр. 247–250, Q4, 10.1134/S1063779622020447

10.

New Nuclear Physical Phenomenon: Spontaneous Nuclear Synthesis

Yushkov A.V., Itkis M.G., Dyachkov V.V., Zaripova Y.A.

10.1134/S1063779622020873

For the first time, we describe a new nuclear-physical phenomenon: the emission of the lightest clusters with mass numbers from 1 to 4 from complex nuclei. The phenomenon is interpreted based on the statement that multiclusters recently experimentally discovered in the volume of nuclei spontaneously enter with each other in thermonuclear fusion reactions, forming the mentioned lightest clusters with noticeable kinetic energies in the exit channels.

Yushkov A.V., Itkis M.G., Dyachkov V.V., Zaripova Y.A, “New Nuclear Physical Phenomenon: Spontaneous Nuclear Synthesis”, Physics of Particles and Nuclei, 2022, 53(2), стр. 447–455, Q4, 10.1134/S1063779622020873

11.

Phosphate Glass Detectors for Heavy Ion Identification

Burtebayev Nassurllaa, Chernyavskiy Mikhailc, Gippius Alexeic; Kalinina Galinac; Konovalov Ninac; Nassurlla Marzhana,   Nassurlla M.; Kvochkina Tatyanaa; Nassurlla Maulena; Okateva Nataliaa,; Pan Andreya; Polukhina Natalia,; Sadykov Zhakypbek

10.3390/universe8090474

The problem of the boundaries of the Mendeleev table of chemical elements is closely related to the understanding of the properties of nuclear matter. In this regard, the synthesis of superheavy nuclei on accelerators and the registration of their decay products are of fundamental scientific interest. The Joint Institute of Nuclear Research in Dubna (JINR) conducts research on the synthesis of superheavy nuclei on the new DC-280 cyclotron (the Factory of Superheavy Elements). As part of the development of this experiment, the possibility of using phosphate glass as a material for detectors of heavy and superheavy nuclei is being considered. This issue requires test experiments to study the recording properties of the glass at different irradiation and treatment conditions. The article presents a method for identifying heavy ions in phosphate glass detectors under various conditions by the geometric characteristics of ion tracks. The results obtained indicate the possibility of using the KNFS-3 phosphate glass detectors for registration and identification of accelerated superheavy nuclei.

Burtebayev Nassurllaa, Chernyavskiy Mikhailc, Gippius Alexeic; Kalinina Galinac; Konovalov Ninac; Nassurlla Marzhana, Nassurlla M.; Kvochkina Tatyanaa; Nassurlla Maulena; Okateva Nataliaa,; Pan Andreya; Polukhina Natalia,; Sadykov Zhakypbek “Phosphate Glass Detectors for Heavy Ion Identification ”, Universe, 2022, 8(9), 474, 10.3390/universe8090474

12.

Charge-changing cross sections for Ca 42-51 and effect of charged-particle evaporation induced by neutron-removal reactions

Tanaka M.,

Takechi M.; Homma A.; Prochazka A.; Fukuda M.; Nishimura D.; Suzuki T.; Moriguchi T.; Ahn D.S.; Aimaganbetov A.; Amano M.; Arakawa H.

10.1103/PhysRevC.106.014617

Charge-changing cross sections σCC for Ca42-51 on a carbon target at around 280 MeV/nucleon have been measured. Though the existing point-proton radii rp of Ca isotopes increase as the neutron number increases, the measured σCC data show a significant decrease, which is against the expectation from a simple Glauber-like model. We found that this observed phenomenon could be attributed to the charged-particle evaporation effect induced by the neutron-removal reaction. By taking the evaporation effect into account, various σCC data sets for nuclides from C to Fe isotopes on C12 measured at around 280 MeV/nucleon are reproduced with a standard deviation of 1.6%. It is also clarified that this evaporation effect becomes negligibly small in the neutron-rich region. The evaluated relation between σCC and rp using the current model indicates that σCC data for neutron-rich Ca isotopes (A≥51) are highly sensitive to rp. This high sensitivity potentially allows one to determine the rp of very neutron-rich nuclei.

Tanaka M.,

Takechi M.; Homma A.; Prochazka A.; Fukuda M.; Nishimura D.; Suzuki T.; Moriguchi T.; Ahn D.S.; Aimaganbetov A.; Amano M.; Arakawa H. “Charge-changing cross sections for Ca 42-51 and effect of charged-particle evaporation induced by neutron-removal reactions”, Physical Review C, 2022, 106(1), 014617, Q2, 10.1103/PhysRevC.106.014617

13.

Deuteron scattering and (d,t) reaction on ¹¹B at an energy of 14.5 MeV

Nassurlla Maulena, Burtebayev N, Sakuta S.B, Karakozov B.K, Burtebayeva J, Khojayev R, Sabidolda A, Yergaliuly G

10.1016/j.nuclphysa.2022.122448

At an energy of 14.5 MeV, the elastic and inelastic scattering of deuterons and the (d, t) reaction on ¹¹B nuclei were studied. Experimental angular distributions with transitions to the states of the ¹¹B nucleus (ground state (3/2⁻), 4.445 (5/2⁻) MeV, 6.743 (7/2⁻) MeV) and to the states of the ¹⁰B nucleus (ground state (3⁺), 0.718 MeV (1⁺), 1.74 MeV (0⁺, T = 1), 2.15 MeV (1⁺)) were analyzed by the coupled channel method. The value of the quadrupole deformation parameter β₂= 0.80 ± 0.2 was extracted. The assumption of a direct mechanism for picking up a neutron in the reaction (d, t) made it possible to describe rather well the measured angular distributions for the states of the ¹⁰B nucleus. The values of the spectroscopic amplitudes for the transitions to these states have been extracted. It is shown that the mechanism of ⁸Be transfer both in the form of a whole cluster and in the sequential transfer of two α-particles does not play a significant role. It was found that the deformation of the ¹⁰B and ¹¹B nuclei noticeably affects the calculated cross sections for the (d, t) reaction.

Nassurlla Maulena, Burtebayev N, Sakuta S.B, Karakozov B.K, Burtebayeva J, Khojayev R, Sabidolda A, Yergaliuly G, “Deuteron scattering and (d,t) reaction on ¹¹B at an energy of 14.5 MeV”, Nuclear Physics A, 2022, 1023, 122448, Q3, 10.1016/j.nuclphysa.2022.122448

14.

Break-up effect of the weakly bound⁶Li ions scattered by²⁰⁸Pb target

Hamada, S., Burtebayev, N., Ibraheem, A.A.

10.31349/REVMEXFIS.68.031201

Using different potentials based on phenomenological, semi microscopic, and microscopic models, we investigated the reaction dynamics induced by the weakly bound ⁶Li ions on a heavy mass target ²⁰⁸Pb at sixteen energy sets ranging from 25 MeV to 210 MeV. The ⁶Li cluster nature and its dissociation into a core (α-particle) and a valence particle (deuteron) orbiting this core was taken into consideration using the cluster folding model (CFM). The new version of Sao Paulo potential (SPP2) is also used to investigate ⁶Li+²⁰⁸Pb data. In order to reproduce the experimental data, the strength of real part of potential created using SPP and CFM should be reduced by ∼ 49 % and 62 %, respectively. The data could be well reproduced using non-renormalized real cluster folding potential, if an additional dynamical polarization potential (DPP) of repulsive real surface form is introduced. The observed reduction in the strength of the real double folded and cluster folding potentials is due to the break-up effect of ⁶Li.

Hamada, S., Burtebayev, N., Ibraheem, A.A., “Break-up effect of the weakly bound⁶Li ions scattered by²⁰⁸Pb target”, Revista Mexicana de Fisica, 2022, 68(3), 031201, Q3, 10.31349/REVMEXFIS.68.031201

15.

Features of Registration of Accelerated Heavy Ions by Phosphate Glass Detectors at Different Temperatures

Burtebaev N., Argynova K., Chernyavskiy M.M, Gippius A.A., Konovalova N.S, Kvochkina T.N., Nasurlla M, Okateva N.M, Pan A.N., Polukhina N.G, Sadykov, Zh. T,

Shchedrina T.V.

10.1134/S1063776122040033

Abstract: The characteristics of heavy ion tracks in phosphate glasses after irradiation under various temperature conditions are presented. Calibration experiments are performed to obtain the dependence of the parameters of the etched tracks on the sample heating temperature and time and on the moment of heating a sample in relation to irradiation and etching. To effectively identify the ion charges, the stability of reproducing the optimum chemical etching conditions (etching chemical solution composition, concentration, etching time) is strictly observed in processing irradiated glasses. The results obtained allow us to conclude that phosphate glasses can be effectively used to detect and identify the superheavy nuclei synthesized at the Factory of Superheavy Elements of the Joint Institute for Nuclear Research (JINR).

Burtebaev N., Argynova K., Chernyavskiy M.M, Gippius A.A., Konovalova N.S, Kvochkina T.N., Nasurlla M, Okateva N.M, Pan A.N., Polukhina N.G, Sadykov, Zh. T,

Shchedrina T.V., “Features of Registration of Accelerated Heavy Ions by Phosphate Glass Detectors at Different Temperatures”, Journal of Experimental and Theoretical Physics, 2022, 134(4), стр. 528–532, Q4, 10.1134/S1063776122040033

16.

Search for possible fission modes at high excitation energies in Fm 254

Banerjee Tathagataa, Kozulin E.M., Burtebayev N.T, Gikal K.B, Knyazheva G.N., Itkis I.M., Novikov K.V, Kvochkina T.N, Mukhamejanov Y.S., Pan A.N

10.1103/PhysRevC.105.044614

Background: Shell effects have been found to influence both the compound nuclear fission (CNF) and quasifission processes. Besides quasifission processes, which fission modes remain active at excitation energy (E?) as high as 56 MeV should be investigated. Purpose: We investigate the signatures of fission modes in Fm254 populated by O16+U238 through the mass distribution (MD) and total kinetic energy distribution (TKED). Method: The mass-Total kinetic energy distributions (M-TKED) of fission fragments of the reaction O16+U238 have been measured at two laboratory energies Elab=89 and 101 MeV. The spontaneous fission (SF) of Fm254, one-dimensional (1D) fragment MD, and two-dimensional (2D) M-TKEDs of O16+U238 have been described by the multimodal random neck rupture (MM-RNR) model. Results: Channel probabilities and the characteristics of different fission modes are obtained and discussed in detail. The enhancement observed in the mass yield (?10-2%) in the region 60-70 u for the light fragments at E-45 MeV goes away at the higher E-56 MeV. The heavy fragments of S1 and S2 modes are found to be associated with Z?53 and Z?56 shells, respectively. The slope of asymmetric to symmetric fission yields (when plotted against E?) of O16+U238 is found to be similar to that of previously reported O18+Pb208. Conclusions: Analysis of 2D M-TKED data by the MM-RNR model reveals the possible presence of fission modes in O16+U238. The liquid-drop-like broad symmetric SL mode is found to peak at a lower energy than predicted by the Viola systematic, which matches mostly with that of Standard 2 mode. No signature of asymmetric quasifission is observed. The MD widths show a linear dependence with the measured energies

Banerjee Tathagataa, Kozulin E.M., Burtebayev N.T, Gikal K.B, Knyazheva G.N., Itkis I.M., Novikov K.V, Kvochkina T.N, Mukhamejanov Y.S., Pan A.N, “Search for possible fission modes at high excitation energies in Fm 254”, Physical Review C, 2022, 105(4), 044614, Q2, 10.1103/PhysRevC.105.044614

17.

Study of the ¹³C(³He, α)¹²C reaction at energies of 50 and 60 MeV

Nassurlla Maulen, Burtebayev N, Karakozov B.K; Sakuta S.B.; Janseitov D; Nassurlla Marzhana, Alimov D; Burtebayeva J.; Sabidolda A.; Kemper K.W.; Khojayev R.; Hamada Sh

10.1088/1402-4896/ac5af6

Cross sections for the 13C(3He, α)12C reaction were measured for 12C states up to excitation energies of about 20 MeV for 3He energies of 50 and 60 MeV. An analysis of the measured angular distributions was carried out using the Coupled Channels Born Approximation method under the assumption of a direct one-step mechanism of picking up a neutron from the 13C nucleus. In these calculations, the real parts of the implemented potentials were constructed within the framework of the double folding model. This analysis made it possible to extract the values of the spectroscopic factors for the 13C g.s. → 12C g.s. (12C∗) + n configurations, which were found to be in reasonable agreement with theoretical predictions.

Nassurlla Maulen, Burtebayev N, Karakozov B.K; Sakuta S.B.; Janseitov D; Nassurlla Marzhana, Alimov D; Burtebayeva J.; Sabidolda A.; Kemper K.W.; Khojayev R.; Hamada Sh, “Study of the ¹³C(³He, α)¹²C reaction at energies of 50 and 60 MeV”, Physica scripta, 2022, 97(4), 045302, Q2, 10.1088/1402-4896/ac5af6

18.

Asymptotic normalization coefficient for ¹²C + p→ ¹³N from the ¹²C (¹⁰B , ⁹Be) ¹³N reaction and the ¹²C (p, γ) ¹³N astrophysical S factor

Artemov S.V., Yarmukhamedov R., Burtebayev N.b, Karakozov B.K., Ergashev F. Kh, Nassurlla Maulen, Igamov S.B., Amangeldi N.b, Morzabayev A.b, Burtebayeva J., Zhdanov V.S., Yergaliuly G.

10.1140/epja/s10050-021-00652-z

This work is aimed at clarifying the contribution of the proton direct radiative capture to the ¹²C (p, γ) ¹³N reaction by specifying the value of the asymptotic normalization coefficient (ANC) for ¹²C + p→ ¹³N _{g. s.}. In order to do this, the differential cross section of the proton transfer in the 12C(10B,9Be)13N reaction at an energy of 41.3 MeV has been measured and analyzed through the modified distorted wave Born approximation (MDWBA) method taking into account the reaction channel coupling and ³He cluster transfer contributions. The value of the ANC was derived to be 1.63±0.13 fm^{- 1 / 2}, which was used in estimating the astrophysical S(E) factor and the reaction rate of the proton radiative capture by the ¹²C nucleus at energies of astrophysical relevance.

Artemov S.V., Yarmukhamedov R., Burtebayev N.b, Karakozov B.K., Ergashev F. Kh, Nassurlla Maulen, Igamov S.B., Amangeldi N.b, Morzabayev A.b, Burtebayeva J., Zhdanov V.S., Yergaliuly G., “Asymptotic normalization coefficient for ¹²C + p→ ¹³N from the ¹²C (¹⁰B , ⁹Be) ¹³N reaction and the ¹²C (p, γ) ¹³N astrophysical S factor”, European Physical Journal A, 2022, 58(2), 24, Q2, 10.1140/epja/s10050-021-00652-z

19.

Fluctuations of Initial State and Event-by-Event Pseudo-Rapidity Correlations in High Energy Nuclear Collisions

Burtebayev Nassurlla, Fedosimova Anastasiya, Lebedev Igor, Dmitriyeva Elena, Ibraimova Sayora,

Bondar Ekaterina

10.3390/universe8020067

The initial state, about which there is usually very little direct experimental information, leads to significant fluctuations in the distribution of secondary particles and fragments. In this paper, to estimate the initial state the fragmentation parameters of interacting nuclei are analyzed. To investigate the correlations, the Hurst method is used. A detailed study of event-by-event pseudo-rapidity correlations in terms of the Hurst index, multiplicity of secondary particles and target dependence has been carried out for heavy (AgBr) and light (HCNO) targets present in the nuclear emulsion (NIKFI BR-2) using Au-197 projectiles at 10.6 A GeV. Evidences of short-range particle correlations and cluster formation in the pseudo-rapidity space are found from our analy-sis. The total ensemble of events has been divided into four classes depending on the behavior of Hurst index: uncorrelated, with short-range correlations, with long-range correlations and mixed. Events of various types differ significantly in the multiplicity of secondary particles, fragmentation of the projectile nucleus, and have significant differences in the pseudo-rapidity distribution of secondary particles.

Burtebayev, Nassurlla, Fedosimova, Anastasiya, Lebedev Igor, Dmitriyeva Elena,

Ibraimova, Sayora,

Bondar Ekaterina, “Fluctuations of Initial State and Event-by-Event Pseudo-Rapidity Correlations in High Energy Nuclear Collisions”, Universe, 2022, 8(2), 67, Q2, 10.3390/universe8020067

20.

Single-particle and cluster modes of 1 3 C excited states of 3.09, 8.86 and 9.89 Mev

Urazbekov B.A., Starastcin V.A., Karakozov B.K., Burtebayev N.T, Janseitov D.M., Nasrulla M, Alimov D., Valiolda D.S., Kazhykenov S.H., Denikin A.S., Demyanova A.S., Danilov A.N.;

10.1142/S0218301322500318

The elastic and inelastic scatterings of deuterons from 13C are registered in a wide range of angles at the laboratory energy of 14.5MeV. Data on the differential cross-sections are treated within both the optical model and coupled-channels method. A new set of optical potential parameters is found. Analyses of the d +13C nuclear reactions are carried out for the levels of excitation 3.089, 8.86 and 9.87MeV. The single particle 12C+n, and cluster 9Be+α models are applied in calculations of differential cross-sections. The calculations show that the state 3.089MeV is populated with the single particle configuration, while the latter bands 8.86MeV and 9.87MeV mainly have the cluster 9Be+α excitation. The major contribution of the Hoyle state of the core 12C is not observed, but the cluster 9Be+α configuration is ascertained to be the main contributor to the state 8.86MeV

Urazbekov B.A.;Starastcin V.A. Karakozov B.K.; Burtebayev N.T; Janseitov D.M. Nasrulla M; Alimov D.; Valiolda D.S.; Kazhykenov S.H.; Denikin A.S.; Demyanova A.S.; Danilov A.N “Single-particle and cluster modes of 1 3 C excited states of 3.09, 8.86 and 9.89 Mev”, International Journal of Modern Physics E, 2022, 2250031, Q4, 10.1142/S0218301322500318

21.

Accretion Disk Luminosity for Black Holes Surrounded by Dark Matter with Tangential Pressure

Boshkayev K., Konysbayev T.; Kurmanov Ye, Luongo O.; Malafarina D.

10.3847/1538-4357/ac8804

We study the motion of test particles in the gravitational field of a Schwarzschild black hole surrounded by a spherical dark matter cloud with nonzero tangential pressure, and compute the luminosity of the accretion disk. The presence of nonvanishing tangential pressure allows us to mimic the dark matter's angular momentum, while still considering a static model, which simplifies the mathematical framework. We compare the numerical results of the influence of dark matter on the luminosity of the accretion disks around static supermassive black holes with the previously studied cases of isotropic and anisotropic pressures. We show that the flux and luminosity of the accretion disk in the presence of dark matter are different from the case of a Schwarzschild black hole in a vacuum, and highlight the impact of the presence of tangential pressures

Boshkayev K., Konysbayev T.; Kurmanov, Ye, Luongo O.; Malafarina D , “Accretion Disk Luminosity for Black Holes Surrounded by Dark Matter with Tangential Pressure”, Astrophysical Journal, 2022, 936(2), 96, Q1, 10.3847/1538-4357/ac8804

22.

Accretion Disk Luminosity for Black Holes Surrounded by Dark Matter with Anisotropic Pressure

Kurmanov, E., Boshkayev, K., Giambò, R., Konysbayev T. Luongo O., Malafarina, D., Quevedo, H.

10.3847/1538-4357/ac41d4

We investigate the luminosity of the accretion disk of a static black hole surrounded by dark matter with anisotropic pressure. We calculate all basic orbital parameters of test particles in the accretion disk, such as angular velocity, angular momentum, energy, and radius of the innermost circular stable orbit as functions of the dark matter density, radial pressure, and anisotropic parameter, which establishes the relationship between the radial and tangential pressures. We show that the presence of dark matter with anisotropic pressure makes a noticeable difference in the geometry around a Schwarzschild black hole, affecting the radiative flux, differential luminosity, and spectral luminosity of the accretion disk.

Kurmanov, E., Boshkayev, K., Giambò, R., Konysbayev T. Luongo O., Malafarina, D., Quevedo, H., “Accretion Disk Luminosity for Black Holes Surrounded by Dark Matter with Anisotropic Pressure”, Astrophysical Journal, 2022, 925(2), 210, Q1, 10.3847/1538-4357/ac41d4

23.

Pedagogical Model for Raising Students’ Readiness for the Transition to University 4.0

JugembayevaB., Murzagaliyeva A.,

 Revalde, G.

10.3390/su14158970

The study goal was to analyze the impact of using modern technologies and pedagogical innovations based on the University 4.0 model on the educational process effectiveness, the development of professional competencies (in humanities and engineering) and skills in students (abstract-logical thinking, critical thinking, strategic thinking, imagination, creativity, motivation), and learners’ readiness and motivation to shift to University 4.0. The experiment was conducted in the Al-Farabi Kazakh National University among 464 undergraduate students of different academic years. All the study respondents were distributed into two groups, one of which did not change the training program (control group), and the other studied under the program grounded on the University 4.0 model using modern technologies (experimental group). According to the results of the survey addressed to the students of both groups after the experiment ended, the indicators for all parameters were higher among the individuals of the experimental group. The practical significance of the results obtained and further research prospects are in the possibility of using the developed training program in different universities and departments worldwide to compare both students’ readiness for the transition to University 4.0 and the program’s impact on educational outcomes.

Jugembayeva,B., Murzagaliyeva, A., Revalde, G., " Pedagogical Model for Raising Students’ Readiness for the Transition to University 4.0", Sustainability (Switzerland), 2022, 14(15), 8970, Q2, 10.3390/su14158970

24.

Natural sorbents and scientific description of their use

Almatova B.,

Khamzina B., Murzagaliyeva A., Abdygalieva A., Kalzhanova A.

10.32014/2022.2518-170X.159

Oil pollution, both in terms of scale and toxicity, is a general planetary danger. Oil and petroleum products cause poisoning, death of organisms and soil degradation. Natural self-purification of natural objects from oil pollution is a long process, especially in conditions where a low temperature regime persists for a long time. The solution of the cleaning problem the soil cover from oil pollution, the development of new and improvement of existing technologies for the restoration of oil-contaminated lands is among the priorities. Diatomites are organic sedimentary rocks, the basis of which are the remains and fragments of unicellular diatomite algae. Many of their deposits are widely represented in the Republic of Kazakhstan, the Russian Federation, China, the USA, Canada and other countries. In the methods of acid, alkaline and salt treatment, the process is aimed at weakening the microstructure of the sorbent, increasing porosity and specific surface layer. At the same time, chemical treatment contributes to a change in the features of the crystal structure, an increase in ion-exchange properties in accordance with the change in the composition of variable cations and the appearance of new active centers. Development of an invention for cleaning oil sludge and smeared soil without using a large volume of scarce fertilizer, replacing it with other plant organic residues, reduce the consumption of materials for cleaning, reduce the cost and accelerate it.

Almatova, B., Khamzina, B., Murzagaliyeva, A., Abdygalieva, A., Kalzhanova, A., “Natural sorbents and scientific description of their use”, News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences, 2022, 2(452), стр. 49–57, Q4, 10.32014/2022.2518-170X.159

25.

Formation of energy spectra of electrons in a dense weakly ionized plasma generated by fission fragments

Shapiyeva A., Son E., Kunakov S.

10.1002/ctpp.202100174

For a weakly ionized dense plasma irradiated by fission fragments, the coupled self-consistent Boltzmann equations for fission fragments and electrons are defined. The evolution of the energy spectra of fast particles in a plasma is investigated on the basis of these equations. Studies of the energy distribution function of fission fragments and primary electrons for a helium-3 plasma irradiated by neutron flux, as well as their non-stationary and stationary analytical solutions, are found and analysed.

Shapiyeva, A., Son, E., Kunakov, S., “Formation of energy spectra of electrons in a dense weakly ionized plasma generated by fission fragments”, Contributions to Plasma Physics, 2022, 62(4), e202100174, Q3, 10.1002/ctpp.202100174

26.

TITAN neutron imaging facility performance

Dyussambayev D.S., Aitkulov M.T., Shaimerdenov A.A., Mukhametuly B., Nazarov K , Dikov A.S., Kaestner A, Barradas N. Pessoa, Sairanbayev D.S., Dikov A.S,     Bazarbayev E.M.

10.1016/j.nima.2022.167078

This paper presents the results of experiments on the TITAN facility to assess the quality of neutron imaging. A set of references samples developed by the Paul Scherrer Institute with the support of the IAEA was used. The results obtained demonstrated that the spatial resolution of the facility is 239μm for radiography and 358μm for tomography. The linear attenuation coefficients were determined for six materials. The maximum difference between the experimental values and the theoretical ones was 38%. The difference between the linear attenuation coefficients of neutron radiation from theoretical values is associated with the spectral dependence, due mainly to scattering and beam hardening that leads to deviation of the linear attenuation coefficient from the Beer–Lambert law. Tomography images were demonstrated that individual copper balls larger than 0.8 mm in diameter can be clearly recognized in a vial filled with balls.

Dyussambayev, D.S., Aitkulov, M.T., Shaimerdenov, A.A., Mukhametuly B, Nazarov K , Dikov   A.S., Kaestner A, Barradas N. Pessoa, Sairanbayev D.S., Dikov A.S,   Bazarbayev, E.M., “TITAN neutron imaging facility performance”, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2022, 1039, 167078, 10.1016/j.nima.2022.167078

27.

Study of the spatiotemporal structure of extensive air showers at high energies

Kalikulov O.A., Saduyev N.O., Shaulov S.B., Zhukov V.V., Beznosko D., Mukhamejanov Y.S., Yerezhep N.O., Baktoraz A.Y., Shinbulatov S.K., Utey Sh., Zhumabayev A.I., Sedov A.N., Oskomov V.V.

10.1088/1748-0221/17/04/C04014

In a series of works carried out at the Tien-Shan High Altitude Science Station (TSHASS), a penetrating component of extensive air showers (EAS) caused by cosmic rays (CR) with energy of the primary particle above 1 PeV was discovered. The local increase in the energy of secondary hadrons in the EAS cores in the region of the CR spectrum slope change around energy of 3 PeV, the so-called "knee". The problem of knee formation currently is one of the currently still open mysteries in astrophysics. The studies carried out at the TSHASS show that more information on the knee region can be obtained by studying the characteristics of the EAS cores. At present, a large installation with an area of several hundred square meters is being constructed at the station to study the EAS cores in the "knee"region. The installation is located at an altitude of 3330 meters above sea level near the city of Almaty, Kazakhstan.

Kalikulov, O.A., Saduyev, N.O., Shaulov S.B., Zhukov V.V., Beznosko D., Mukhamejanov Y.S., Yerezhep N.O., Baktoraz A.Y., Shinbulatov S.K., Utey, Sh., Zhumabayev A.I., Sedov, A.N., Oskomov V.V., “Study of the spatiotemporal structure of extensive air showers at high energies”, Journal of Instrumentation, 2022, 17(4), C04014, Q4, 10.1088/1748-0221/17/04/C04014

28.

Analysis of continuum level density for virtual and resonance states

Odsuren M., Khuukhenkhuu G., Sarsembayeva A.T., Amangeldi N., Katō, K.

10.1007/s12648-020-01994-y

We investigate the effects of resonant or virtual state and non-resonant contributions in continuum level density. In addition, we discuss the decomposed continuum level density and the M1 transition strength in the scattering problem in terms of the Green function with complex scaling method.

Odsuren, M., Khuukhenkhuu, G., Sarsembayeva, A.T., Amangeldi, N., Katō, K., “Analysis of continuum level density for virtual and resonance states”, Indian Journal of Physics, 2022, 96(2), стр. 543–547, Q3, 10.1007/s12648-020-01994-y

29.

Investigation of low-lying resonances in breakup of halo nuclei within the time-dependent approach

Valiolda D., Janseitov D., Melezhik V.

10.1140/epja/s10050-022-00684-z

We investigate the Coulomb breakup of ¹¹Be halo nuclei on a heavy target (²⁰⁸Pb) from intermediate (70 MeV/nucleon) to low energies (5 MeV/nucleon) within the non-perturbative semiclassical and quantum-quasiclassical time-dependent approaches. The convergence of the computational scheme is demonstrated in this energy range including n + ¹⁰Be low-lying resonances in different partial and spin states. We have found a considerable contribution of the 5 / 2 ⁺ resonance (E_r = 1.23 MeV) to the breakup cross section at 30 MeV/nucleon and lower, while at higher energies, the resonant states 3 / 2 ^- and 3 / 2 ⁺ (with E_r = 2.78 and 3.3 MeV) make most visible contributions. The obtained results are in good agreement with experimental data available at 69 and 72 MeV/nucleon. Comparison with the existing theoretical calculations of other authors for 20 and 30 MeV/nucleon is also made. The developed computational scheme opens new possibilities in the investigation of the Coulomb, as well as nuclear, breakup of other halo nuclei on heavy and light targets.

Valiolda D., Janseitov D., Melezhik V., “Investigation of low-lying resonances in breakup of halo nuclei within the time-dependent approach”, European Physical Journal A, 2022, 58(2), 34, Q2, 10.1140/epja/s10050-022-00684-z

30.

Investigation of fragmentation reactions of exotic nuclei in a high-energy approximation

Ismailova A.N., Janseitov D.M., Sharov P.G.

10.32523/ejpfm.2022060202

Studies of the properties of nuclei remote from the "valley of nuclear stability" make it possible to predict the properties of new nuclides based on systematic accumulations of data on the structure of nuclear matter. New phenomena in the behavior of nuclear matter are also being discovered. Such cores are called "exotic". The production of exotic nuclei is a multi-stage process, during which various approaches of theoretical and experimental physics are applied. One of the ways to obtain nuclei are fragmentation reactions of relatively light nuclei with high energy (more than 100 MeV), as a result of which exotic nuclei with different A and Z can be obtained. In this article, a study of the applicability of the high-energy approximation (HEA) in modeling such direct nuclear reactions was conducted and the results of comparing this approach with the exact solution of the Schrodinger equation using the example of a rectangular potential barrier and a Gaussian potential barrier are presented. Comparison of different approaches provides an understanding of the limitations of their applicability for further study of the properties of nuclei in interaction with each other and for solving the Schrodinger equation with similar potentials considered

Ismailova, A.N., Janseitov, D.M., Sharov, P.G., “Investigation of fragmentation reactions of exotic nuclei in a high-energy approximation, “Eurasian Journal of Physics and Functional Materials, 2022, 6(2), стр. 109–117, 10.32523/ejpfm.2022060202

31.

Experimental study of fast fission and quasifission in the Ca 40 + Pb 208 reaction leading to the formation of the transfermium nucleus No 248

Kozulin E.M, Knyazheva G.N., Bogachev A.A., Saiko V.V, Karpov A.V., Itkis I.M., Novikov K.V., Mukhamejanov Y.S., Pchelintsev I.V., Vorobiev I.V., Banerjee T, Cheralu M

10.1103/PhysRevC.105.024617

The stability of the transfermium nucleus against fission is mainly determined by the shell correction depending on its angular momentum and excitation energy. Purpose: The study of the fast fission process of the transfermium nucleus No248 and its dependence on the interaction energy and introduced angular momentum. Methods: Mass-energy distributions of the No248 fission fragments formed in the Ca40 + Pb208 reaction at energies above the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET at the Ca40-beam energies of 223, 250, and 284 MeV. Results: The contribution of the fast fission process is determined from the calculations of the driving potential, taking into account shell effects and rotational energy and amounts to 39% and 61% at 250 and 284 MeV, respectively. The mass-energy distributions of the quasifission and fast fission fragments have been extracted by subtracting the mass-energy matrices associated with compound nucleus fission from those of all measured fissionlike events. The asymmetric fragments with masses 97 and 151 u were found to be the most probable in the fast fission of No248. With increasing Ca40 energy from 250 to 284 MeV the mass distributions of the fast fission fragments change slightly. Conclusions: Contrary to quasifission in which the fragments are focused mainly around the closed neutron or proton shells, the influence of known proton or neutron shells on the asymmetric mass distribution in the fast fission process was not observed.

Kozulin E.M, Knyazheva G.N., Bogachev A.A., Saiko V.V, Karpov A.V., Itkis I.M., Novikov K.V., Mukhamejanov Y.S., Pchelintsev I.V., Vorobiev I.V., Banerjee T, Cheralu , “Experimental study of fast fission and quasifission in the Ca 40 + Pb 208 reaction leading to the formation of the transfermium nucleus No 248”, Physical Review C, 2022, 105(2), 024617, Q2, 10.1103/PhysRevC.105.024617

32

Fission of

Kozulin E.M; Knyazheva G.N.; Itkis I.M; Itkis M.G., Mukhamejanov Y.S.; Bogachev A.A.; Novikov K.V.; Kirakosyan V.V.; Kumar D; Banerjee T; Cheralu M; Maiti M

10.1103/PhysRevC.105.014607

The nature of asymmetric fission of preactinides is not yet understood in detail, despite intense experimental and theoretical studies carried out at present. Purpose: The study of asymmetric and symmetric fission of Hg180,182,183 and Pt178 nuclei as a function of their excitation energy and isospin. Methods: Mass-energy distributions of fission fragments of Hg180, Pt178 (two protons less than Hg180), and Hg182 (two neutrons more than Hg180) formed in the Ar36+Sm144, Nd142, and Ca40+Nd142 reactions were measured at energies near and above the Coulomb barrier. Fission of Hg183 obtained in the reaction of Ca40 with Nd143 was also investigated to see if one extra neutron could lead to dramatic changes in the fission process due to the shape-staggering effect in radii, known in Hg183. The measurements were performed with the double-arm time-of-flight spectrometer CORSET. Results: The observed peculiarities in the fission fragment mass-energy distributions for all studied nuclei may be explained by the presence of a symmetric fission mode and three asymmetric fission modes, manifested by the different total kinetic energies and fragment mass splits. The yield of symmetric mode grows with increasing excitation energy of compound nucleus. Conclusions: The investigated properties of asymmetric fission of Hg180,182,183 and Pt178 nuclei point out the existence of well-deformed proton shell at Z≈36 and a less deformed proton shell at Z ≈ 46.

Kozulin E.M; Knyazheva G.N.; Itkis I.M; Itkis M.G., Mukhamejanov Y.S.; Bogachev A.A.; Novikov K.V.; Kirakosyan V.V.; Kumar D; Banerjee T; Cheralu M; Maiti M, “Fission of”, Physical Review C, 2022, 105(1), 014607, Q2, 10.1103/PhysRevC.105.014607

33.

GRB 190829A—A Showcase of Binary Late Evolution

Wang, Yu; Rueda J.A.; Ruffini R.; Moradi R.; Li, Liang; Aimuratov Y.; Rastegarnia F.; Eslamzadeh S.; Sahakyan N.; Zheng, Yunlong

10.3847/1538-4357/ac7da3

GRB 190829A is the fourth-closest gamma-ray burst to date (z = 0.0785). Owing to its wide range of radio, optical, X-ray, and very-high-energy observations by HESS, it has become an essential new source that has been examined by various models with complementary approaches. Here, we show in GRB 190829A that the double prompt pulses and the three multiwavelength afterglows are consistent with the type II binary-driven hypernova model. The progenitor is a binary composed of a carbon-oxygen (CO) star and a neutron star (NS) companion. The gravitational collapse of the iron core of the CO star produces a supernova (SN) explosion and leaves behind a new NS (νNS) at its center. The accretion of the SN ejecta onto the NS companion and onto the νNS via matter fallback spins up the NSs and produces the double-peak prompt emission. The synchrotron emission from the expanding SN ejecta, with energy injection from the rapidly spinning νNS and its subsequent spindown, leads to the afterglow in the radio, optical, and X-ray bands. We model the sequence of physical and related radiation processes in BdHNe, and focus on individuating the binary properties that play the relevant roles

Wang, Yu; Rueda J.A.; Ruffini R.; Moradi R.; Li, Liang; Aimuratov Y.; Rastegarnia F.; Eslamzadeh S.; Sahakyan N.; Zheng, Yunlong     , “GRB 190829A—A Showcase of Binary Late Evolution”, Astrophysical Journal, 2022, 936(2), 190, Q1, 10.3847/1538-4357/ac7da3

34.

Development of a System for Detecting Traveling Ionospheric Disturbances Based on GNSS Data

Andreye A., Kapytin V., Mukasheva S., Somsikov V.

10.3390/atmos13020183

The large amount of data that are available for ionospheric studies using the GPS TEC method, as well as the need to take into account complex atmospheric dynamics, create certain difficulties in automating the process of searching and recognizing traveling ionospheric disturbances generated by different sources. To automate the process of detecting wave disturbances, numerical criteria for assessing the level of the wave disturbance signal were proposed. The signal-to-noise ratio calculated by the proposed method was used as one of such criteria. This work contains a description of the developed software system that implements the proposed methodology and allows the loading of RINEX files and processing, analyzing, and visualizing total electron content data.

Andreyev, A., Kapytin, V., Mukasheva, S., Somsikov, V., “Development of a System for Detecting Traveling Ionospheric Disturbances Based on GNSS Data”, Atmosphere, 2022, 13(2), 183, Q3, 10.3390/atmos13020183