-
Development of a Frequency Control Device for a Superconducting Half-Wave Resonator Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 R. E. Nemchenko, M. A. Gusarova
Abstract The results of mechanical and electrodynamic calculations of a frequency tuner for the half-wave superconducting resonator operating at 325 MHz and a relative speed of 0.21 for the Nuclotron-NICA mega-science injection facility are presented. The tuner compensates for the resonance frequency drift caused by external factors. Methods for tuning the frequency of half-wave resonators are considered
-
Preparation and Performance of Irradiation Experiments on the HIPr-1 Heavy Ion Accelerator for Express Analysis of Tungsten and Steel Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 K. E. Pryanishnikov, P. A. Fedin, R. P. Kuibeda, E. R. Khabibullina, N. P. Bobyr, T. V. Kulevoy
Abstract This article discusses modernization of the HIPr accelerator for irradiation of tungsten samples with a 10 × 10 mm form factor aimed at simulating radiation induced defects. The measurement system of the beam current is developed for experiments on target irradiation. The simulation results of beam transport in the accelerator output channel are presented with the measurements of beam transversal
-
On the Polarizability of a Cluster of Interacting Particles in Polarization Radiation Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 D. Yu. Sergeeva, A. A. Tishchenko
Abstract The study considers diffraction radiation, which is excited when an electron moves near a cluster of two interacting subwavelength particles. The interaction is manifested in the fact that the radiation field from each particle is determined not only by the external field of the electron, but also by the field of the neighboring particle. Based on the obtained expressions for the radiation
-
Formation of Thin-Film Nanoparticle Materials for Single-Photon Avalanche Detectors Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 O. S. Vasilyev, P. V. Borisyuk, Yu. Yu. Lebedinskii
Abstract The results of the formation of an original material based on thin films of metal nanoclusters and the investigation of its chemical composition, surface morphology, and structure are presented. Monodisperse thin films comprised of individual nanoclusters of Ta, Mo, and Ni metals were manufactured by gas-phase magnetron sputtering. Images of the surface were obtained by scanning electron microscopy
-
Measurement of Electron Emission Spectra from Micropinch Discharge Plasma Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 O. A. Bashutin, I. G. Grigoryeva, A. N. Korf, A. S. Savelov, G. Kh. Salakhutdinov
Abstract In this paper, we describe a small-size magnetic spectrometer of electrons that allowed studying the spectral composition of electron emission in the energy range of 5–400 keV from a micropinch discharge plasma using a low-inductance vacuum spark setup.
-
Production of Mixed Powders of Actinide Dioxides by Thermal Reductive Denitration Using Microwave Heating Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 Yu. M. Kulyako, T. I. Trofimov, K. S. Pilyushenko, S. E. Vinokurov, B. F. Myasoedov
Abstract The use of microwave heating to produce solid solutions of actinide oxides in the processes of thermal denitration of model nitric acid solutions formed in reducing stripping schemes at the final stages of the PUREX process, containing U and Th (Pu simulator) and unreacted reducing agents (hydrazine, etc.), is proposed. As a result, after quantitative distilling of water vapor, acid, and volatile
-
On the Possibility of Surface Analysis by keV-Energy Proton Scattering in Magnetic Fusion Devices Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 V. A. Kurnaev, D. G. Bulgadaryan, D. N. Sinelnikov
Abstract The processes of erosion and redeposition of plasma-facing materials in fusion devices are some of the most important factors affecting the plasma parameters and the resource of the first wall. The method of analyzing thin layers on a surface using keV-energy proton scattering expands the functionality of determining the rate of erosion and deposition of layers with a large atomic number on
-
Technological Possibilities of Realization of Sealed Accelerator Tubes Based on Diodes with Magnetic Isolation Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 R. P. Pleshakova, A. V. Ilyinskiy, A. A. Isaev, K. I. Kozlovskiy, E. A. Shikanov, A. P. Skripnik
Abstract Two technological schemes are considered, as well as the possibilities of their implementation for the manufacture of sealed accelerator tubes based on diodes with magnetic isolation Schematic designs of tubes under development with a laser source of deuterons and an electronic conductivity suppression system are presented. To do this, a sufficiently heat-resistant permanent magnet is included
-
Determining the Centrality of a Nuclear Collision Using a Hadron Calorimeter Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 A. B. Kurepin, A. G. Litvinenko, E. I. Litvinenko
Abstract Determining the centrality of a collision, or the impact parameter, in heavy-nucleus collisions is important for the analysis of all experimental data and their comparison with theory. One of the methods for this is to measure the number of spectators using a hadron calorimeter arranged at a small angle to the nuclear beam. It is shown that the accuracy in determining the impact parameter
-
Hydrogen Solubility in Zirconium Alloys Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 A. A. Plyasov, V. V. Novikov, Yu. N. Devyatko
Abstract Analysis of the published to date results for hydrogen solubility in zirconium alloys—core structural materials of water-cooled nuclear reactors is presented. Data for hydrogen solubility in Russian domestic and foreign zirconium alloys are summarized.
-
Testing Secondary-Emission Self-Oscillatory Probe Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 I. V. Vizgalov, I. A. Sorokin
Abstract The test results of the prototype of the secondary-emission probe operating in the mode of self-oscillatory sweep intended for diagnosing nonequilibrium plasma in the presence of epithermal group of electrons are given. Earlier, the method of self-oscillatory probe was tested using an aluminum water-cooled contact surface with formation of a nanoscale thick high-emission oxide coating. The
-
The Nature of Anomalous Particles (Granules) in Rapidly Quenched PREP Powders—II. A Multiscale Study of PREP Powders and PM HIP Compacts of Ni-Based Superalloys and Stainless Steels Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-21 A. V. Shulga
Abstract The formation of anomalous particles (granules) with a significantly different content of microalloying interstitial elements of carbon and boron characterizes the heterogeneity of the composition of rapidly quenched particles of high temperature Ni-based superalloys and stainless steels powders manufactured by the plasma rotating electrode process (PREP) technique. A detailed multiscale experimental
-
Power Sources of the Type of Reactors for Nuclear Thermal Propulsion in the Earth’s Defense System under Conditions of Asteroid-Comet Hazard Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 G. V. Konyukhov, V. A. Pavshook
Abstract A concept on how to use a power source of the type of reactors for nuclear thermal propulsion in the Earth’s defense system under condition of asteroid-comet hazard is presented. The concept is verified by unique results obtained in the field of physics and thermal physics for reactors and technologies for designing prototypes under performance of the state program on developing nuclear propulsion
-
On the Issue of Stability and Safety of the Superbooster, a Pulsed Neutron Source Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 M. V. Rzyanin, E. P. Shabalin
Abstract A high-intensity pulsed neutron source can be constructed according to the principle of a superbooster, i.e., a neutron multiplying system of the neutron-generating target of the proton accelerator with proton energy of about 1 GeV in the subcritical reactivity modulation system. Usually, superboosters are considered to be safe and reliable nuclear facilities. However, as indicated in this
-
Comparing Measured and Simulated Reaction Rates in Uranium and Nickel Detectors of the BARS-5M–RUN-2 Reactor Complex Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 V. I. Litvin, L. Yu. Samoylova, D. V. Zaitsev, A. L. Podyezzhikh, D. V. Khmelnitsky
Abstract Nuclear reaction rates in the nickel and uranium detectors placed at different positions within the reactor cores of the TIRAN nuclear reactor complex are measured. The measured reaction rates are found to be consistent with those simulated using the PRISMA-D Monte Carlo code with the values of neutron constants as quoted in the ENDF-BVI library. Relying on the simulation, the signals of nickel
-
Determination of Computer Code Error by Experimental Results Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 V. N. Siryapin, M. O. Zakutaev, M. A. Uvakin, N. V. Siryapin, M. A. Bykov
Abstract We determine the computer code error taking into account errors of experiments. Using the statistical simulation methods, we find the error taking into account both the measurement error for the studied parameter and the errors of the initial and boundary conditions of the experiment.
-
Key Research Results for Nuclear-Pumped Lasers at VNIIEF Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 A. A. Pikulev, A. A. Sinyanskii, S. P. Melnikov, V. M. Tsvetkov, S. L. Turutin, A. N. Kuznechenkov
Abstract A short review of studies on nuclear-pumped lasers conducted at VNIIEF is presented.
-
Accounting for Edge-Plasma Parameter Dynamics at JET Divertor Sputtering Estimation during Edge-Localized Modes Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 I. E. Borodkina, V. A. Kurnaev
Abstract The sputtering of tungsten divertor tiles at the JET ITER-like wall (ILW) during edge-localized modes (ELMs) is one of the main sources of tungsten impurity in the core plasma. The analytical approach for interpretation of the Langmuir probe (LP) measurements of ion flux at the divertor tile is elaborated to model the ELM ion parallel transport and to estimate the flux of sputtered tungsten
-
Hortitsa-M Program. Determination of Power Density Field from Readings of In-Core Detectors Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 D. N. Skorokhodov
Abstract The information on the creation, development, and current state of the Hortitsa-M program are given. The main equations and algorithms of the program are described.
-
Application of Doppler Backscattering for Alfvén Mode Study on the Globus-M Spherical Tokamak Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 V. V. Bulanin, N. N. Bakharev, V. K. Gusev, G. S. Kurskiev, V. B. Minaev, M. I. Patrov, A. V. Petrov, Yu. V. Petrov, N. V. Sakharov, P. B. Shchegolev, A. Yu. Telnova, S. Yu. Tolstyakov, A. Yu. Yashin
Abstract The Alfvén oscillations were studied using the multifrequency Doppler backscattering (DBS) method on the Globus-M spherical tokamak during the neutral deuterium injection. The principles of Alfvén mode registration by the DBS method are discussed. Microwave schemes of multifrequency probing are described. It is shown that the observed plasma rotation velocity oscillations are due to the oscillations
-
Absolutization of the Subcriticality Levels Measured by the Neutron Source Multiplication Method and the Area Ratio Method Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 V. F. Kolesov
Abstract Versions of the neutron source multiplication (NSM) method are considered. The method developed at foreign research institutes to determine the reactivity of deeply subcritical reactors uses reactivity of the “reference” level. Further, the results of the use in the above methods and in the area ratio method of the computational experiment simulation technique that yields sufficiently precise
-
Measuring Spectral Indices in a Critical Cylindrical Uranium System with a Lithium Hydride End Reflector Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 A. A. Vayvod, S. S. Besov, A. A. Yudov, M. A. Demidenko, V. I. Litvin, S. A. Andreev
Abstract The results of precision experiments concerning neutron passage through the layers of lithium-7 hydride are reported. Activation integrals for neutron activation detectors positioned at various points of the composite lithium-7 hydride reflector mounted at the end of the uranium breeder system have been determined. Spectral indices have been calculated on the basis of the data obtained.
-
New Version of the KTM Lithium Divertor Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 A. V. Vertkov, M. Yu. Zharkov, I. E. Lyublinski, A. V. Berlov, I. L. Tazhibayeva, Yu. V. Ponkratov, Yu. N. Gordienko
Abstract At present, the Kazakhstan Tokamak for Material testing (KTM) project is in progress. The optimization of innovative design elements of the divertor is carried out at the KTM, in addition to studying materials applied for fusion technologies. The design of the lithium divertor module based on lithium capillary porous systems has been developed and tested successfully in real tokamak conditions
-
Conceptual Design of a Hybrid Fusion–Fission Power Reactor with a Tokamak and a Depleted Uranium Blanket Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 S. V. Mirnov, G. G. Gladush, A. A. Gostev, A. V. Lopatkin, I. B. Lukasevic, I. E. Lyublinsky
Abstract We assess the viability of energy generation with depleted uranium irradiated with fast neutrons from the reaction of DT fusion driven by a tokamak reactor. Since existing nuclear power plants employ uranium fuel enriched to 4.5% 235U, over 90% of natural uranium currently goes to nuclear waste and is no longer used for power generation. The amount of depleted uranium with the 235U content
-
Analysis of Electromagnetic Forces in Tokamak Vacuum Chamber due to Induced Poloidal Current after Thermal Quench Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 M. L. Dubrov, V. E. Lukash, R. R. Khayrutdinov, V. N. Dokuka
Abstract The work is devoted to the analysis of the influence of poloidal current induced in a tokamak vacuum chamber due to change of paramagnetic plasma properties as a result of thermal quench on the magnitude and distribution of electromagnetic forces in a vacuum chamber. The work was performed numerically using the plasma-physics code DINA for conditions of major disruption in the plasma of ITER
-
Simulation of Fuel Flows in Injection Systems of Demo-FNS Hybrid Facility Involving Coupled Modeling of the Core and Divertor Plasmas Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 S. S. Ananyev, A. Yu. Dnestrovskij, A. S. Kukushkin, A. V. Spitsyn, B. V. Kuteev
Abstract The FC-FNS fuel cycle model is used to calculate the hydrogen isotope flows in the fuel systems of a tokamak-based fusion neutron source (DEMO-FNS) with parameters R/a = 3.2 m/(L m), B = 5 T, Ip = 4–5 МА, PNBI = 30 MW, PECR = 6 MW, and DT fusion power Pfus = 40 MW. The FC-FNS (Fuel Cycle for Fusion Neutron Source) model has been significantly upgraded. For the first time, a joint simulation
-
The Use of Thorium in a Nuclear Power System with Thermal and Fast Neutron Reactors Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 E. A. Bobrov, E. A. Andrianova, V. Yu. Blandinskiy, P. S. Teplov, A. V. Gurin
Abstract The concept of a fast neutron reactor with a sodium coolant with metallic U–Pu fuel in the core and metallic uranium and thorium in the blankets is considered. The achievement of the required system characteristics for the initial loading and surplus fuel breeding is demonstrated. Several scenarios of the development of a two-component nuclear power system in Russia based on the VVER-type
-
Some Thoughts on the Future of the Nuclear Energy Industry Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 E. P. Velikhov, V. D. Davidenko, V. F. Tsibulskiy
Abstract Recent assessments of the strategic prospects of the nuclear energy industry tend to show a somewhat condescending attitude towards fusion, which, regretfully, has grounds given the current state of affairs in nuclear science. However, the analysis of the problems and the potentialities of the fusion of light nuclei and fission of heavy nuclei suggests that a full-scale development of each
-
Investigation of Molybdenum Mirror Degradation during Simulated Leakage in the Water Cooling System of ITER Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 Yu. V. Kapustin, A. V. Rogov
Abstract Contamination of ITER in-vessel components in accidents associated with the ingress of water from the cooling system into the vacuum vessel poses a threat to subsequent operation of the entire facility and individual diagnostic systems. In the present study, the process of degradation of the optical properties of single-crystal Mo mirrors, which are used in optical diagnostics, in their interaction
-
Estimation of the Degradation Rate of the In-Vessel Mirrors for the H-Alpha and Visible Spectroscopy Diagnostics in ITER Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 E. N. Andreenko, I. I. Orlovskiy, A. G. Alekseev, A. A. Morozov
Abstract Mirrors for light transmittance will be used in more than 30 optical and laser diagnostics installed in the ITER tokamak reactor. Their reliable performance depends largely on the degradation rate of the first mirror directly facing the plasma. The fluxes of neutral atoms, mostly D, T, and Be, from the plasma are the most dangerous for the first mirror. The interaction with the high-energy
-
Analysis of the Accuracy of Measuring the Flux Density of All Hydrogen Isotopes from First Wall to Plasma Using the H-Alpha Diagnostics in ITER Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 A. B. Kukushkin, V. S. Neverov, V. S. Lisitsa, V. A. Shurygin, A. G. Alekseev
Abstract The results of the analysis of the accuracy of measuring the flux density of all hydrogen isotopes from the first wall of the main vacuum chamber to the ITER tokamak plasma using the high-resolution spectroscopy of Balmer alpha lines of hydrogen isotopes (H-alpha diagnostics) are presented. Under the conditions of the expected high background radiation generated by the divertor stray light
-
Fading Correction of Readings of Glass Gamma-Radiation Dosimeters SOPD (DTS)-0.05/10 within the Interval of Post-Irradiation Measurements from 1 to 100 Days Phys. Atomic Nucl. (IF 0.328) Pub Date : 2021-02-11 A. S. Koshelev, E. Yu. Tarasova, P. Yu. Lapin, A. E. Nikiforov
Abstract This work presents the results of experimental study of post-irradiation variation (fading) of SO PD (DTS) dosimeter readings within the interval from 1 to 100 days after radiation loading by reactor (BR-K1) and bremsstrahlung (LU-10-20) gamma quanta within the interval of absorbed doses from 50 Gy (water) to 10 kGy (water). There is advanced a formalism for fading correction of dosimeter
-
Erratum to: Electronic Catalogue of Mesoroentgen Spectra Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 D. R. Zinatulina
Erratum
-
Measurement of the Cross Section for the Process $$\boldsymbol{e^{+}e^{-}\to K^{+}K^{-}}$$ with the CMD-3 Detector Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 V. L. Ivanov
Abstract Preliminary results of measurement of the cross section for the process \(e^{+}e^{-}\to K^{+}K^{-}\) in the range of c.m. energies between 1.075 and 1.975 GeV are presented. An analysis was performed on the basis of an integrated luminosity of 62.9 pb\({}^{-1}\) accumulated by employing the CMD-3 detector within the experimental runs of 2019. The suppression of the background from the processes
-
Form Factor of Proton Predicted Using the Data of ppbar Elastic Scattering at $$\boldsymbol{\sqrt{s}=1.96}$$ eV Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 S. Zahra, B. Shafaq, B. Kanwal
Abstract Based on the behavior of elastic scattering of proton and anti-proton at \(\sqrt{s}=1.96\) TeV for squared four-momentum transfer \(0.26<{-}t<1.2(\)GeV\(/c)^{2}\), form factor of proton is predicted. Simplest version of Chou–Yang model is employed for extracting this form factor by fitting experimental data of differential cross section from D0 experiment to a single Gaussian. Root mean square
-
Coherent Photoproduction of Neutral Pseudoscalar Mesons $$\boldsymbol{\pi^{0}\pi^{0}}$$ and $$\boldsymbol{\pi^{0}\eta}$$ on Light Nuclei Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 M. V. Egorov
Abstract The coherent photoproduction of \(\pi^{0}\pi^{0}\) and \(\pi^{0}\eta\) on nuclei in the mass-number region of \(A\leqslant 7\) is studied systematically over the range between the threshold and the laboratory photon energy of \(E_{\gamma}=2\) GeV. The amplitude for photoproduction on nuclei is constructed on the basis of the impulse approximation with allowance for a number of processes responsible
-
Dynamics of Nuclear Cascades in the Photoproduction of Light Neutral Mesons Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 V. G. Nedorezov, A. A. Turinge
Abstract New experimental data on the multifragmentation of carbon nuclei that is initiated by the photoproduction of neutral pions and eta mesons are discussed. The novelty is associated with the exclusive character of the processes being studied, in which case a determination of partial meson-photoproduction reactions is followed by an analysis of complementary particles for coincidence. The experiment
-
Correlation Between the Behavior of $${\alpha}$$ -Decay Half-Life Time and $$\boldsymbol{Q}$$ Values with Neutron Number Variation of Daughter Nuclei Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 M. Ismail, A. Abdurrahman, A. R. Abdulghany
Abstract \(\alpha\) decay of 2000 parent heavy and superheavy nuclei, with atomic numbers in the range \(Z=80\) to \(Z=122\), is considered. We calculated the half-life time, \(T_{\alpha}\), of each nucleus using the density-dependent cluster model with M3Y-effective nucleon–nucleon interaction. The \(Q_{\alpha}\) values needed for calculation of \(T_{\alpha}\) were extracted from four different mass
-
Simultaneous Investigation of the Nuclear Reactions $${}^{11}$$ B $$\boldsymbol{(p,3\alpha)}$$ and $${}^{11}$$ B $$\boldsymbol{(p,n)^{11}}$$ C as a New Tool for Determining the Absolute Yield of Alpha Particles in Picosecond Plasmas Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 V. S. Belyaev, A. P. Matafonov, V. P. Krainov, A. Yu. Kedrov, B. V. Zagreev, A. S. Rusetsky, N. G. Borisenko, A. I. Gromov, A. V. Lobanov, V. S. Lisitsa
Abstract The results of experimental investigations devoted to initiating the promising nuclear fusion reaction \({}^{11}\)B\((p,3\alpha)\) in picosecond laser plasmas at a laser-radiation intensity of \(5\times 10^{18}\) W/cm\({}^{2}\) are presented. A new tool for determining the absolute yield of alpha particles in the reaction \({}^{11}\)B\((p,3\alpha)\) on the basis of simultaneously measuring
-
Search for the Process $${e}^{+}{e}^{-}\to \eta^{\prime}\gamma$$ with the SND Detector Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 M. N. Achasov, A. Yu. Barnyakov, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. A. Botov, V. B. Golubev, T. V. Dimova, V. P. Druzhinin, V. N. Zhabin, L. V. Kardapoltsev, A. S. Kasaev, A. N. Kyrpotin, D. P. Kovrizhin, I. A. Koop, A. A. Korol, A. S. Kupich, K. A. Martin, N. A. Melnikova, N. Yu. Muchnoi, A. E. Obrazovskiy, A. V. Otboyev, E. V. Pakhtusova, K. V. Pugachev, Yu
Abstract The results of searches for the process \(e^{+}e^{-}\to\eta^{\prime}\gamma\) in an experiment with the SND detector at the VEPP-2000 electron–positron collider are presented. The data used in these searches and based on an integrated luminosity of about 87 pb\({}^{-1}\) were accumulated at c.m. energies \(\sqrt{s}\) between 1.15 and 2 GeV. The upper limits of \(\sigma_{\eta^{\prime}\gamma}<28\)
-
Theoretical Calculation of the IBM1 Parameters and Band Crossing in Even Cerium Isotopes Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 A. D. Efimov
Abstract An extended microscopic version of the interacting-boson model is developed. The properties of yrast-band states in even cerium isotopes up to the spin–parity of \(I^{\pi}=18^{+}\) are calculated on the basis of this model. These spin values include those at which band crossing occurs. The model parameters are calculated on the basis of employing an average spherical potential and residual
-
Modular $${A}_{{4}}$$ Invariance Model for Lepton Masses and Mixing Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 Mohammed Abbas
Abstract A flavor model based on \(A_{4}\) modular group is proposed. We consider the inverse seesaw mechanism to produce the light neutrino masses. Both neutrino and charged lepton masses are obtained in terms of Yukawa coupling ratios and the module \(\tau\) of the \(A_{4}\) modular form. The calculated lepton parameters (masses and mixings) are in good agreement with the recent neutrino data. The
-
Atomic Processes Accompanying Alpha Decay of Superheavy Nuclei Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 V. K. Nikulin, M. B. Trzhaskovskaya
Abstract Processes involving the ionization of atomic shells and x-ray transitions in daughter nuclei and accompanying alpha decay of superheavy isotopes are considered. The probabilities for \(N\)-shell ionization during the decay of isotopes entering into the tennessine (\({}^{294}_{117}\)Ts) and oganesson (\({}^{294}_{118}\)Og) alpha-decay chains are calculated. The Dirac–Fock method is used, and
-
Global Calculations of Beta-Decay Properties Based on the Fayans Functional Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 I. N. Borzov
Abstract An effective approximation to a fully self-consistent global description of beta-decay properties of nuclei within the theory of finite Fermi systems is presented. It is based on describing the ground state properties within the energy density functional proposed by Fayans and coauthors (DF3) and on the continuum quasiparticle random-phase approximation (CQRPA). The accuracy of global DF3
-
CP Violating Phase Originated from Right-handed Neutrino Mixing Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 Xiao-Yan Wang, Xiang-Jun Chen
Abstract We propose an idea that the observed CP violation in neutrino oscillation is originated from the phase in right-handed neutrino mixing by seesaw mechanism. We add small breaking terms \(M_{ij}N_{R_{i}}N_{R_{j}}\) in the model based on \(A_{4}\) symmetry to generate non-diagonal right-handed neutrino mixing, which will give a small correction to TBM mixing via seesaw mechanism with nonzero
-
Core Deformation Impact of One- and Two-Proton Halo $${}^{{27}}$$ S Nucleus Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 J. Islam, F. H. M. Salih, S. Radiman, K. S. Khoo
Abstract The core deformation of a one- and two-proton halo \({}^{27}\)S nucleus was investigated based on experimental data. The Hamiltonian of the three-body systems and the root-mean-square (RMS) matter radii were used to calculate the theoretical value. The calculated theoretical value was analyzed using the relationship of the core deformation parameter (\(\beta_{2}\)) with the binding energy
-
Branching Ratio and CP Violation in $${B}_{{s}}^{{0}}\rightarrow{\rho}^{{0}}{\phi}$$ Decay in the Framework of QCD Factorization Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 E. H. Raslan, H. R. Khan
Abstract We present an analytic calculation of Branching Ratio (BR) and Charge–Parity (CP) violating asymmetries of the \(B_{s}^{0}\)-meson decay into the two light vectors \(\rho^{0}\phi\). In doing this we calculate the helicity amplitude of the present decay in the framework of QCD factorization approach. We find the BR of \(B_{s}^{0}\rightarrow\rho^{0}\phi=(0.26\pm 0.04)\times 10^{-6}\) which is
-
Combined Description of the Total and Differential Cross Sections and the $${\rho}$$ -Parameter for $$\boldsymbol{p(\bar{p})p}$$ Scattering over the Energy Region of $$\boldsymbol{\sqrt{s}\geqslant 7}$$ GeV and for all Values of $$\boldsymbol{t<0}$$ Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-10-13 V. I. Belousov, V. V. Ezhela, N. P. Tkachenko
Abstract The results of a combined description of data on the differential and total scattering cross sections and the \(\rho\)-parameter for \(p(\bar{p})p\) collisions in tuning the parameters of an analytic model constructed in order to describe data over a broad region of kinematical variables for \(\sqrt{s}\gtrsim 7\) GeV and all currently available experimental data on \(t\) are presented. The
-
Strong Resonances at High Excitation Energy in $${}^{\mathbf{17}}$$ O $$+$$ Alpha Resonance Scattering Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 D. K. Nauruzbayev, A. K. Nurmukhanbetova, V. Z. Goldberg, M. La Cognata, A. Di Pietro, P. Figuera, S. Cherubini, M. Gulino, L. Lamia, R. G. Pizzone, R. Spartà, A. Tumino, A. Serikov, E. M. Gazeeva
Abstract The thick target inverse kinematics (TTIK) approach was used to measure excitation functions for the elastic \({}^{17}\)O (\(\alpha,\alpha\)) scattering at the initial \({}^{17}\)O beam energy of 54.4 MeV. We observed strong peaks corresponding to highly excited \(\alpha\)-cluster states in the \({}^{21}\)Ne excitation energy region of 8–16 MeV, which have never been investigated before. Additional
-
Results of the Further Analysis of Data from the Tien Shan Array in the Energy Spectrum of Primary Cosmic Rays in the Energy Range of $${2\times 10^{13}{-}3\times 10^{17}}$$ eV Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 E. N. Gudkova, N. M. Nesterova
Abstract The energy spectrum of primary cosmic rays at energies between 2\(\times 10^{13}\) and 3\(\times 10^{17}\) eV is presented according to data from the Tien Shan array on the basis of the detection of the number of electrons in extensive air showers. In the energy range of \(5\times 10^{15}{-}3\times 10^{17}\) eV, the spectrum was obtained by means of the HADRON array and was extended to the
-
New Class of Nuclear Decays Involving Virtual States of Intermediate Nuclei Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 S. G. Kadmensky, L. V. Titova, D. E. Lyubashevsky
Abstract Nuclear reactions and decays belonging to a new class referred to as a virtual class since virtual intermediate states of \(A\geqslant 2\) atomic nuclei at off-shell energies are involved in the amplitude of the widths with respect to such processes are studied by considering examples of two-proton and double-beta decays of nuclei, as well as spontaneous ternary fission of even–even actinide
-
Phase Transitions and Shape Coexistence in Atomic Nuclei Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 R. V. Jolos, E. A. Kolganova, L. A. Malov, E. V. Mardyban, D. A. Sazonov, T. M. Shneidman
Abstract Examples of phase transitions occurring in atomic nuclei in response to an increase in the excitation energy and angular momenta and in response to a change in the number of nucleons are considered. The possibility of describing such transitions within collective models based on a Hamiltonian that depends on a relatively small number of dynamical variables is demonstrated.
-
Conversion of Ultrarelativistic Electrons to Positrons in Thick Targets Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 S. S. Belyshev, L. Z. Dzhilavyan, A. L. Polonski
Abstract The values calculated for the electron-to-positron conversion coefficients in a form differential with respect to the energy of product positrons and with respect to the solid angle of their emission, this being the most important feature of positron production in thick converter targets, are analyzed and are compared with relevant experimental data. This analysis is performed for a needle-like
-
Investigation of Excitation of $${K}$$ Isomers $${}^{{179m2}}$$ Hf and $${}^{{180m}}$$ Hf in ( $${\gamma,\gamma^{\prime}}$$ ) Reactions Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 V. A. Zheltonozhsky, M. V. Zheltonozhskaya, A. N. Savrasov, A. P. Chernyaev, V. N. Yatsenko
Abstract The weighted-average cross sections for \({}^{179m2}\)Hf and \({}^{180m}\)Hf population in (\(\gamma,\gamma^{\prime}\)) reactions induced by gamma rays of bremsstrahlung spectrum with endpoint energies of 17.5, 37, and 55 MeV were measured for the first time. A second maximum in the excitation function for the \(K\) forbidden isomers of \({}^{179}\)Hf and \({}^{180}\)Hf was found in the energy
-
Nonresonance Shake Mechanism in Neutrinoless Double Electron Capture Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 F. F. Karpeshin, M. B. Trzhaskovskaya, L. F. Vitushkin
Abstract It is generally accepted that neutrinoless double electron capture is a resonance process. The probability for the shake followed by electron-shell ionization occurring in the course of transformation of \({}^{152}\)Gd nuclei is calculated. Among all known nuclei, this nuclide is characterized by the lowest resonance defect and is therefore thought to be one of the main candidates for use
-
Nucleosynthesis-Rate Dependence of Abundances of Nuclei Produced in the r-Process Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 I. V. Panov, Yu. S. Lutostansky
Abstract The rate of neutron-induced nucleosynthesis of heavy nuclei is determined by the astrophysical scenario and by the rate of beta decay of nuclei involved in the r-process. The effect of beta-decay rates calculated within various theoretical models on the abundances of heavy nuclei is analyzed on the basis of the yields of heavy nuclei in the r-process and the determination of their sensitivity
-
$${T}$$ -Invariance Conditions for Differential Cross Sections for Binary Nuclear Reactions Involving Spin-Oriented Particles and Nuclei Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 S. G. Kadmensky, P. V. Kostryukov, D. E. Lyubashevsky
Abstract By employing the \(T\)-invariance condition for the amplitudes describing arbitrary binary nuclear reactions that involve spin-oriented particles and the respective time-reversed reactions, a relation between the differential cross sections for these reactions is obtained for the first time. These cross sections are determined with the aid of sets of potentials simulating the interaction between
-
Analytic Continuation of Scattering Data, Asymptotic Normalization Coefficients, and Astrophysics Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 L. D. Blokhintsev, D. A. Savin
Abstract The formalism of asymptotic normalization coefficients and methods for determining them from experimental nuclear data are discussed. A new method is proposed that uses the continuation of the modulus squared of a partial-wave amplitude. It is shown that the recently proposed \(\Delta\) method for the continuation of elastic scattering data is not strictly correct. It is argued that, unlike
-
Isoscalar and Isovector Giant Resonances in Closed Shells Nuclei and Bulk Properties of Nuclear Matter Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 S. Shlomo
Abstract Centroid energies, \(E_{\textrm{CEN}}\), of the isoscalar (\(T=0\)) and isovector (\(T=1\)) giant resonances of multipolarities \(L_{m}=0\)–3 in \({}^{\mathrm{40,48}}\)Ca, \({}^{\mathrm{68}}\)Ni, \({}^{\mathrm{90}}\)Zr, \({}^{\mathrm{116}}\)Sn, \({}^{\mathrm{144}}\)Sm, and \({}^{\mathrm{208}}\)Pb, were calculated within the fully self-consistent spherical Hartree–Fock (HF)-based random-phase
-
Data on Neutron–Neutron Scattering Length from the Reaction $$\boldsymbol{n+^{2}\textrm{H}\to n+n+p}$$ at $$\boldsymbol{E_{n}=60}$$ MeV Phys. Atomic Nucl. (IF 0.328) Pub Date : 2020-09-12 E. S. Konobeevski, A. A. Afonin, S. V. Zuyev, A. A. Kasparov, V. V. Mitcuk, M. V. Mordovskoy, S. I. Potashev
Abstract The \({}^{1}S_{0}\) neutron–neutron (\(nn\)) scattering length was measured in the neutron–deuteron (\(nd\)) breakup reaction at an energy of 60 MeV. The respective experiment was performed in the geometry of final-state interaction via detecting all three secondary particles. The scattering-length value of \(a_{nn}={-}16.3\pm 0.5\) fm was determined on the basis of a comparison of the experimental
Contents have been reproduced by permission of the publishers.