Abstract IACTs are one of the key parts of the TAIGA observatory and designed for study of gamma rays and charged cosmic rays in the energy range of 10\({}^{13}{-}10^{18}\) eV. The first IACT was designed and fabricated at the JINR workshop and has been operating since 2016 in the Tunka valley. The second one has been assembled there at September 2018 and the production of the third one is in progress

Abstract Preliminary results of the investigation of the characteristics of 5 groups of galaxies are discussed in the presented article. We have analyzed the main characteristics of galaxy clusters 933, 88, 142, 1046, 1101 from CfA2 redshift survey. Clusters 933, 142, 1046, and 1652 have high-energy gamma associations on Fermi/LAT data (4FGL J1144.9 \(+\) 1937, 4FGL J0152.2 \(+\) 3714, 4FGL J1230.8

Abstract For investigation of the cosmic muon scattering tomography (MST) concept at NRC ‘‘Kurchatov Institute’’—IHEP the large-scale setup has been constructed. The setup includes 8 planes (\(3\times 3\) m\({}^{2}\) each) of 3-layer drift tube chambers, the total quantity of drift tubes is 2304. The drift tubes were filled with gas mixture Ar \(+\) 7\({\%}\) CO\({}_{2}\) at 0.5 bar overpressure on

Abstract The IceCube Observatory includes both a deep in-ice array of 86 strings of sensors, and a surface array of 81 stations of frozen water tank detectors (IceTop). These multiple detectors make it possible to measure different cosmic ray air shower components, and to combine these measurements to determine both the spectrum and composition of cosmic rays. This work focuses on two analyses of 3

Abstract We obtain democratic mass matrix by using the hypothesis of single right-handed neutrino dominance. By adding perturbation to the democratic mass matrix and constraining mass eigenstates according to experimental fact, we attempt to predict neutrino oscillation parameters.

Abstract The IceTop detector is the surface component of the IceCube Observatory: an array of 81 ‘‘stations’’ of two frozen water tanks. Each tank contains two photosensors, and is sensitive to both the electromagnetic component of cosmic ray air showers as well as surface muons. While the electromagnetic component dominates in tanks close to the shower core, the signals from muons become more pronounced

Abstract PRISMA-32 (PRImary Spectrum Measurement Array) is working since 2012 in the Scientific & Educational Center NEVOD (NRNU ‘‘MEPhI’’, Moscow). Array area is \({\sim}500\) m\({}^{2}\). PRISMA-32 consists of 32 specially developed electron–neutron detectors capable to measure simultaneously electronic and hadronic components of the extensive air showers with energies above \(10^{14}\) eV. This

Abstract The article describes the method for modifying the scintillation calorimeter detectors \(C\)3 (\(S3\)) and \(C\)4 (\(S4\)) of the GAMMA-400 space complex in order to obtain the possibility of detecting neutrons produced in the process of passing electrons (positrons) and high-energy protons through detector matter. The presented method will allow to increase the rejection factor of background

Abstract The TAIGA experiment (Tunka Advanced Instrument for cosmic ray physics and Gamma-ray Astronomy) combines heterogeneous arrays of imaging and non-imaging Cherenkov light detectors for registration of extensive air showers. Monte Carlo simulation of the whole detector response was carried out and is described in this article.

Abstract The GAMMA-400 gamma-ray telescope is planned for the launch at the end of 2026 on the Navigator service platform designed by Lavochkin Association on an elliptical orbit with following initial parameters: an apogee \({\sim}\)300 000, a perigee \({\sim}\)500 km, a rotation period \({\sim}\)7 days and inclination of 51.4\({}^{\circ}\). The apparatus is expected to operate for more than 5 years

Abstract The presence of the 125-GeV Higgs boson in the particle spectrum of the minimal supersymmetric (SUSY) standard model (MSSM) implies that the SUSY breaking scale has to be larger than \(1\text{ TeV}\). In this case some fine-tuning of the MSSM parameters is needed to get so light Higgs state. In a certain part of the parameter space of the simplest extension of the MSSM—next-to-minimal supersymmetric

Abstract The Gamow–Teller strength functions as well as electron capture and \(\beta\) decay rates for \({}^{56,78}\)Ni in hot stellar environment are calculated within a thermodynamically consistent approach based on the thermal quasiparticle RPA. We present a thorough analysis of the tensor interaction effects on the GT strength functions at zero and finite temperatures. To this aim we use self-consistent

Abstract It is shown in the tetrad representation that there are Reissner–Nordström solutions describing systems with a finite action and total inertial mass equal to the gravitational mass. These systems consist of entirely electromagnetic and gravitational fields. There are not any massive point-charges inside them. The system is called ‘‘the classical electron’’ if its charge is equal to \({-}4

Abstract An approach to describing main properties of isoscalar giant multipole resonances in medium-heavy closed-shell nuclei is proposed within the particle–hole dispersive optical model formulated recently. The description includes the energy-averaged strength function, projected transition density, and partial branching ratios for direct single-nucleon decay. The results obtained within this approach

Abstract In this paper after a historical introduction I discuss ideas of a pion softening and pion condensation in a dense nuclear matter, in particular in neutron stars, and a conjecture about a feasible existence of abnormal nuclei.

Abstract The physics of strongly correlated Fermi systems, being the mainstream topic for more than half a century, still remains elusive. Recent advancements in experimental techniques permit to collect important data, which, in turn, allow us to make the conclusive statements about the underlying physics of strongly correlated Fermi systems. Such systems are close to a special quantum critical point

Abstract Fundamentals of fermion-condensation physics are outlined. Fermion condensation is a phase transition occurring in a strongly correlated Fermi system upon a topological reconstruction of the Landau ground state and leading to the formation of a fermion condensate that possesses the dispersionless single-particle spectrum \(\epsilon({\mathbf{p}})=0\) in the momentum-space region adjacent to

Abstract The operation of a wide field-of-view (WFOV) Cherenkov telescope is described. Detection of extensive air showers (EAS) of cosmic rays (CR) is based on the coincidence with signals from the Yakutsk array. The data acquisition system (DAQ) of the telescope yields signals connected with EAS development parameters: shower age and position of shower maximum in the atmosphere. Here we describe

Abstract Variations of secondary cosmic rays on the Earth’s surface depend on the solar activity. To study these variations, neutron monitors and muon detectors are used. Observations of muons and hadrons complement each other in terms of the energies of the primary cosmic rays and their angular distribution. Muons save the direction of the motion of primary particles and make it possible to obtain

Abstract The \(\beta\)-decay half-life and the delayed neutron emission of \({}^{60}\)Ca are studied within a microscopic model, which is based on the Skyrme interaction T45 to construct single-particle and phonon spaces. We observe a redistribution of the Gamow–Teller strength due to the phonon-phonon coupling and the tensor correlations, considered in the model. For \({}^{60}\)Sc, the spin-parity

Abstract The Large-Volume scintillation Detector commonly known as LVD and located at the Gran Sasso Laboratory at an average depth of 3650 m w.e. measures muons of intensity \(3.31\times 10^{-4}\) m\({}^{-2}\) s\({}^{-1}\). The results obtained from an analysis of the properties of seasonal variations of the horizontal and vertical muon fluxes are presented in this article. Horizontal muons detected

Abstract The electromagnetic dissociation of ultrarelativistic nuclei has a substantial impact on the lifetime of beams in the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC), and secondary nuclei produced upon this dissociation may have an adverse effect on collider components. At the same time, the detection of neutrons originating from the electromagnetic dissociation process

Abstract Various aspects of restoration of Wigner’s supersymmetry [SU(4) symmetry] in heavy and superheavy nuclei are analyzed by comparing the results of calculations with experimental data. The energy differences between the giant Gamow–Teller and analog resonances (\(E_{\mathrm{G}}\) and \(E_{\mathrm{A}}\)) are given according to calculations within the theory of finite Fermi systems for 34 nuclei

Abstract The energy density functional proposed earlier by Fayans and his coauthors is modified in such a way as to apply it in fully self-consistent calculations of isobaric analog resonances (IAR) in nuclei featuring pairing. The continuum quasiparticle random-phase approximation is used. Limits on the parameters of screening of exchange Coulomb interaction are deduced from a systematic analysis

Abstract Proton single-particle properties of even–even tin isotopes in the mass number range between 100 and 132 were calculated on the basis of the dispersive optical model. The possibility of describing data on the charge radius \(r_{\mathrm{ch}}\) was studied. A decrease in the rate of growth of \(r_{\mathrm{ch}}\) with increasing \(N\) in the region of \(N>76\) was obtained via increasing the

Abstract It is proposed to test the parameters used in a self-consistent analysis of the nucleon distribution in nuclei via the calculation of the nucleus–nucleus potential, which is necessary for describing nuclear decays. The nucleon distribution is shown to correlate with the parameters of the nucleon–nucleon interaction. A unified approach to calculating characteristic alpha-decay and spontaneous-fission

Abstract Factors affecting the stability of gadolinium- and neodymium-loaded liquid organic scintillators intended for use in large-scale experimental facilities for neutrino physics and astrophysics are examined. The effect of composition (type and structural formula of gadolinium and neodymium compounds) on the optical properties of such scintillators is analyzed. It is shown that the oxidation of

Abstract The angular-momentum dependences are analyzed for parity splitting and electric dipole transitions in alternating-parity bands of heavy nuclei. It is shown that these dependences can be treated universally by employing a single parameter taken to be a critical angular momentum that characterizes the phase transition from octupole vibrations to a stable octupole deformation. Analytic expressions

Abstract NEWSdm [Nuclear Emulsions for WIMP (weakly interacting massive particles) Search—directional measurement] is a new international experiment in which a photoemulsion target is used for a direct detection of dark-matter particles. In this experiment, the detection method is based on fixing the directions of trajectories of recoil nuclei originating from the elastic interaction of target nuclei

Abstract Three types of isobaric resonances—giant Gamow–Teller, analog, and pygmy resonances (GTR, AR, and PR, resonances)—are studied within the microscopic theory of finite Fermi systems and its model approximation. The calculated GTR, AR, and PR energies agree well with experimental data. The parameters of local Landau–Migdal isospin–isospin and spin–isospin interactions are determined from a comparison

Abstract The evolution of close binary cosmic objects in the mass-asymmetry coordinate is considered. Conditions for the formation of stable symmetric binary stars and galaxies are analyzed. The role of symmetrization of an asymmetric binary system in the transformation of the potential energy into the internal energy and in the release of a large amount of energy is explained.

Abstract Some results obtained by E.E. Saperstein and his coauthors in the theory of the ground state and low-lying excited states of magic and semimagic nuclei are discussed briefly. Corrections to the creation amplitude \(g\) for one low-lying phonon are considered for the first time. These corrections, treated on the basis of the existence of a small parameter, include the tadpole-induced coupling

A method for optimizing the configuration of the shield from ionizing radiation for the facility analyzing the elemental composition of rocks, which is installed at the Department of Applied Nuclear Physics of the National Research Nuclear University MEPhI. Optimization is performed by the methods of mathematical simulation of the distribution of the equivalent dose rate generated during the facility

Within the QCD kt-factorization approach, the cross sections for the processes of Higgs boson inclusive production and decay at LHC energies are derived. The calculus relies on transverse-momentum-dependent unintegrated gluon distribution functions in the proton obtained by numerically solving the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) equation. On the whole, the ATLAS and CMS measurements of differential

Determination of the direction to a source of (anti)neutrinos is important for the physics of supernovae and of the Earth. Inverse beta decay reaction allows to reconstruct the direction to a source of antineutrinos. We present modern mathematical formalism and recent experimental data on antineutrino directionality.

The flexible laser micromilling technology for ceramic MEMS production of microhotplates in the surface mount device (SMD) package is described. Current results demonstrate that using described technology makes it possible to manufacture all parts of MEMS sensor in the SMD with form factor of SOT-23 package type.

The paper presents the results of mechanical tensile tests and microhardness of samples obtained from stainless steel 316L powder by direct laser deposition. The strength characteristics of the deposited samples are better than those of rolled ones obtained in the traditional way. The material strength is reduced and its plasticity is increased with the growth of the laser radiation power during deposition

The possibility of modifying the scheme of the previously developed three-channel polarization interferometer and creating a device that allows laser probing of plasma with a femtosecond time resolution is demonstrated. The test experiments with a spark in air generated by a nanosecond laser pulse using a probing pulse with duration of 50 fs are carried out. High-contrast interference plasma images

The collective acceleration of laser plasma ions in a magnetic field generated by a powerful fast-growing current pulse in a low-inductive conical spiral is studied. The velocity of ions for a number of elements which significantly differ in atomic weight are obtained on the basis of collector measurements. The maximum velocity of both light (lithium) and heavy (lead) ions exceed the value of 108 cm/s;

A system is presented for registering shadow images obtained from dense pulsed plasma with a high background illumination level, wherein an LGI-21 molecular nitrogen laser is used as an illuminator (laser pulse power 12 µW, duration 20 ns), and a modified Canon EOS 1000D camera is used as a registering unit. A micropinch discharge such as a high-current low-inductance vacuum spark (HCLIVS) has been