The optimal regimes of irradiation of metal disks of natural iridium with thermal neutrons of the WWR-SM reactor were found and the radionuclide 192Ir with high specific activity (up to 250 Ci/g) was obtained. To determine the flux density of thermal neutrons and their distribution along the vertical channel, a TND-2.0 thermoneutron sensor and 59Co monitors in the form of a disk - foil (∅ = 3.0 mm, h = 0.2 mm, m = 3.0 mg) containing an alloy of aluminum and 59Co (0.01%) were used. The maximum values of the potential difference and thermal neutron flux densities are observed at a distance of 35-45 cm down from the top point of the vertical channel (or 35–45 cm down from the top point of the IRT-4M fuel assembly head). The observed high values of cadmium ratios show that neutron activation of natural iridium is mainly due to thermal neutrons. With increase in the thickness of the iridium disk, the yield of the induced activity of the 192Ir radionuclide decreases. Packages of natural iridium disks were irradiated with thermal neutrons in the vertical channel of the reactor, radiochemically processed and manufactured ionizing radiation sources of 192Ir with activity of 50–120 Ci, which were tested for tightness by the immersion method. A test of a sample of a metal pipe with a diameter of 219.0 mm, a wall thickness of 8.0 mm with a welded seam through two walls, carried out with an 192Ir source of non-destructive testing of welding quality, showed a good result and the obtained gamma-graphic images in terms of sensitivity and quality corresponded to the requirements of GOST-7512- 82 “Control non-destructive. Welded joints ”(Russia) and ASME (USA). The sources of 192Ir with gammaray flaw detectors Gammarid-192/120M were used for non-destructive testing of the quality of welded joints of pipelines at the construction objects of the Talimarjan TPP, Takhiyatash TPP and the Kandym gas processing plant of the Republic of Uzbekistan.

In the paper is discussed the prospects of studying the stimulated de-excitation of the nuclear isomers (SDENI) 186m1Re in a plasma with an electron temperature θe of the order of the energy ΔE of the trigger transition, this transition transfers the isomeric nucleus to a higher level, from which rapid decay into the ground state of the nucleus is possible. Recently, stimulated de-excitation of the 186m1Re isomer was found in a laser plasma with a temperature of θe ~ 1 keV and a lifetime of about 0.3 ns. However, the probability PSDENI of the stimulated de-excitation of the isomer was very small, about 10–5%. In order to increase the probability SDENI, it is proposed to use instead the laser plasma the plasma of a high-current electric discharge with a temperature of θe ~ 1 keV. In particular, it is proposed to use the plasma of the electric explosion of conductors, the lifetime of such plasma can be two orders of magnitude longer than the lifetime of the laser plasma. To select the plasma parameters for the most effective stimulation of 186m1Re isomers de-excitation, a simple formula was derived to estimate the probability PSDENI depending on the plasma parameters. In order to increase the probability PSDENI, it is also suggested to irradiate the plasma with photons of the frequency resonant to the trigger transition, and a mode of multiple repetitive high-current electric discharges in a plasma containing isomeric nuclei is proposed. It is noted that the accumulated experimental and theoretical results allows already now to start developing an energy source based on the 186m1Re isomers.

An experiment to study total nuclear photoabsorption cross sections at the linear electron accelerator LUE-8-5 (INR, RAS) in the photon energy region of 5–10 MeV called the pygmy resonance is simulated. The motivation for the experiment is new experimental data on photoexcitation of spin isomers of medium-heavy nuclei, which indirectly indicate a change in multipolarity of near-threshold photoabsorption of nuclei. The experiment implies direct investigation of the observed effects by measuring total photoabsorption cross sections in the photon beam. The simulation is performed using the GEANT-4 code. The parameters of the facility are optimized, and the choice of the detectors for the measurements is substantiated.

Usage of parallelised tools allows the efficient exploitation of the modern multicore and muptiprocessor systems and significant reduction of the processing time for the interactive data analysis. The development and performance of the parallelisation software within the OSTAP project, used for the interactive analysis of LHCb data, are reported. The efficient multicore and multiprocessing paralellisation is achieved via usage the pathos framework for heterogeneneous computing.

A structural configuration and parameters of a modernized source of electrons and gamma quanta with energy of 4–10 MeV are presented. The source is designed on the basis of electron linac LUE-8-5 RV (INR RAS) and can be used for detector calibration and other practical applications.

The new semiconductor detectors, which based on CdZnTe crystals and CeBr3 scintillator, were presented in this work. The spectroscopic setup for testing measurements was created, which consists of CdZnTe, CeBr3, and Si (measuring α and γ) detectors. The main characteristics of these detectors including enegy resotion FWHM/Eγ (keV) and efficiency εabs (%) were investigated and determined. Moreover, we have checked the possibility of registration in a wide range of energy. The alpha-gamma and gamma-gamma coincidence measurements were carried out using these detectors. The results could be used to study the mechanisms of nuclear reactions and the properties of reaction products.

Experimental verification for correctness of registration for delayed neutrons from 238U photofission is described for the maximum energy of bremsstrahlung γ-quanta ≅10 MeV at the pulsed linear electron accelerator LUE-8-5 in an interval of (1–5) ms after each beam pulse in time ≳7 min from start of irradiation. The measurements were carried out using the scintillation spectrometer for fast neutrons based on a stilbene single crystal with pulse shape discrimination for scintillations from γ-quanta and fast neutrons. The time dependence of counting rates of delayed neutrons from 238U photofission was measured at a repetition rate of 300 s-1 in intervals of (1.25–3.30) ms.

Description of computer code developed for processing images obtained in pepper-pot emittance measurement technique, which allows estimating emittance in single measurement. The code uses pepper-pot mask image on a scintillator screen obtained by means of laser-plasma radiation. This image is used to find positions of holes of the mask and its rotation angle. Pepper-pot techinique is applied to measure emittance of carbon ion beam extracted from laser produced plasma, generated by CO2-laser pulses with the focal power density on the target of about 1011 W/cm2. Results of image processing and calculating emittance are presented.

We consider a cluster of Primordial Black Holes (PBH) which is decoupled from the cosmological expansion (Hubble flow) and this region is heated as compared to the surrounding matter. The increased temperature inside the region can be explained by several mechanisms of PBH formation. The temperature dynamics is described by the appropriate equations in the framework of the Chapman–Enskog procedure.

Authors within the Higgs Boson Working Group (HWW) of the ATLAS experiment at the LHC performed an analysis of events with electron, muon and two hadron jets to study Standard Model Higgs boson properties in the h → WW* → еνμν decay channel. The analysis is based on full statistics of proton-proton interactions taken during 2015–2018 year exposures at 13 TeV energy in their rest-frame. With respect to our previous analysis, the data sample used is four times larger, the reconstruction software as well as signal and background samples are updated. Exposures taken at high LHC luminosity are studied separately. It turned out that most of experimental spectra for hadron jets at early selection stages in the signal region are rather well modeled by Monte-Carlo simulations. Even at high luminosity, there are no serious problems with forward going hadron jets reconstruction. Kinematic distributions in the control regions of main backgrounds are reproduced by the Monte-Carlo.

On the basis of previous studies carried out by the authors of this work, it was shown that the external environment of a person has a rather strong effect on the annual intake of radon and its daughter decay products into the human body. In this paper, the authors presented a computational model and its software implementation in the form of a computer program that allows calculating the accumulated doses from various radionuclides in organs and tissues of the human body. This software and mathematical complex simulates the spread of radionuclides throughout the body, taking into account the experimental coefficients of transition from one organ to another. Such a mathematical calculation, based on the experimental accumulation factors and methods for calculating the ICRP doses, makes it possible to calculate the internal radiation doses of the corresponding organs and tissues. A mathematical model has been developed for the transportation and accumulation of natural radionuclides in the organs of the respiratory and digestive systems of the human body on the basis of the accumulation and transition coefficients for the corresponding organs. The visualization of the accumulated doses of a certain organ is carried out against the background of a person’s silhouette and the corresponding body system of this organ that is part of it. The degree of “highlighted” organs is normalized to the maximum doses of sanitary norms of the Republic of Kazakhstan for this organ and this radionuclide. In this simulation, the calculations of the accumulated doses from the concentrations of radionuclides in the respiratory and digestive systems of the human body are performed. This complex is designed, first of all, to perform preliminary estimated estimated doses in organs from a wide range of radionuclides, both for diagnostic purposes and in the form of demonstration material at specialized courses in radioecological and medical centers or in higher education.