To provide experiments on stimulating the de-excitation of the isomeric state of 186mRe nuclei (half-life of the isomer T1/2 = 2 × 105 years), the possibility of producing weighed amounts of isomeric 186mRe nuclei by irradiating natural rhenium in the neutron flow of a pressurized water reactor was considered. From a comparison of the activity of the 186mRe isomer in rhenium samples irradiated inside the reactor core and by thermalized neutrons, it was shown that the isomers are formed mainly in the radiative capture of thermal neutrons by 185Re nuclei. The integral cross section for isomer formation is 300 ± 60 mb. Taking into account the burn up of the starting isotopes and the produced isomer, the maximum concentration of the 186mRe isomer of about 0.13 % relative to other rhenium isotopes is achieved at a neutron fluence of 2.2 × 1022 cm–2. To obtain a material with a higher concentration of the 186mRe isomer, one can first purify irradiated rhenium from chemical impurities on an ion-exchange column and then isolate the isotope with a mass number of 186. This will be an almost pure isomer of 186mRe, since the ground state of 186Re nuclei decays with a period of T1/2 = 90 h. For the separation of rhenium isotopes, the gas-centrifugal method using gaseous rhenium hexafluoride is promising; its boiling point is only 33.7 °C. A metal from the pure 186mRe isomer will essentially be a new state of matter.

   The results of tritium production cross sections in ²⁷Al, ^natNi and ^natW thin targets irradiated by protons with energies ranging from 40 to 2600 MeV are presented. These targets have been irradiated at the ITEP accelerator U-10 in the form of single and double metal-aluminum “sandwiches”. Tritium has been extracted from targets using a Sample Oxidizer system and its activity was measured using a ultra low level liquid scintillation spectrometer. To calculate cross sections tritium losses were estimated during irradiation of targets (geometric correction) and during storage (diffusion correction). The values of the tritium production cross sections were used to assess the predictive power of CEM03.03 nuclear model.

   The BM@N (Baryonic Matter at the Nuclotron) is an experiment at the NICA (Nuclotron-based Ion Collider fAcility). The first physics runs were carried out with the collection of experimental data in 2018. The problem of particle identification is necessary for the physical analysis of the matter formed after the collision of the beam with the target. This paper describes identification algorithms based on the method n_δ and a variation of the distance method. The algorithms were tested on simulated data, the results are analyzed for efficiency and contaminations.

   The review of measurements of the first five angular coefficients for Z bosons produced in pp collisions at √s = 8TeV  and decaying to mu+mu- is presented. The data collected by the CMS detector during the LHC Run-I (2011–2012) was used. Full statistics corresponds to integrated luminosity Lint = 19.7fb-1.

   In this paper, we consider the measurement of η-mesons by a statistical method with the rejection of pairs of clusters with an invariant mass corresponding to π⁰-meson. The efficiency (the ratio of the number of η-mesons that passed selection to the number of η-mesons before selection) and the improvement of the signalto-background ratio as a function of the transverse momentum for proton-proton collisions at energy at the energy = 13 TeV simulated using PYTHIA 8.2 (Monash 2013) were measured. The efficiency of the new method is about 80 % with a 20–50 % improvement in the signal-to-background ratio.

   The decays of B⁰_S → J/ψΚ⁺Κ⁻π⁺π⁻ are studied using a data set corresponding to an integrated luminosity of 9 fb⁻¹ collected by the LHCb experiment in proton−proton collisions between 2011 and 2018. The decays B⁰_S → J/ψΚ^*0Κ^*0 and B⁰_S → xc l(3872)Κ⁺Κ⁻ where the Κ⁺Κ⁻ pair does not originate from the ϕ meson are observed for the first time. Precise measurements of the branching fraction ratios between B⁰_S → J/ψΚ^*0Κ^*0,  ⁰S → xc l(3872)ф and B⁰_S → xc l(3872)Κ⁺Κ⁻ channels are reported. A structure denoted X(4740) is observed in the J/ψϕ mass spectrum with a significance in excess of 5.3 standard deviation. In addition, the most precise measurement of the B⁰_S meson mass in made.

   The high statistics collected by the LHCb experiment in proton-proton collisions during Run 1 and 2 of the Large Hadron Collider provides a unique opportunity for study of beauty baryons and to broaden knowledge about their spectroscopy. The paper presents the recent results of searches for new beauty particles decays, as well as the results of searches for new excited states of b-hadrons. In particular, the first observation of excited Ω^-_b states, the observation of two narrow Л_b(6146)⁰ and Л_b(6152)⁰ states, the observation of new Л_b^**0 state consistent with the prediction for Л_b(2S)⁰ baryon, and the observation of the Л_b⁰ → ψ  2S pπ^- decay are presented.

   The interaction of a heavy ion beam with matter is a fundamental problem of the plasma physic and high-energy density in matter physics. The paper presents the results of experimental studies of energy losses of Fe⁺² ions with an energy of 100 keV/u in a hydrogen plasma. The experimental data of plasma free electron stopping power are compared with theoretical models.

   The PolFusion experiment is under preparation at the National Research Center Kurchatov Institute — PNPI, in collaboration with Forschungszentrum Juelich, Germany, and INFN/University of Ferrara, Italy; the experiment will study the ²H(d, n)³He and ²H(d, p)³H reactions with a polarized beam and target at low energies up to 100 keV. In this experiment, the differential cross sections and spin-correlation coefficients will be measured for various beam and target polarizations. The status of the PolFusion experiment is discussed. The paper contains a brief review of the theoretical models that can be used to describe dd fusion. The mathematical calculations based on partial wave decomposition that can be used for processing the obtained experimental data are considered.

   At present, an actual problem is the study of temporal variations of various nuclear radiation from the lithosphere in foothill and desert landscapes. This refers to the fluxes of neutrons, gamma quanta, beta particles and emanations of heavy chemical elements. The problem of studying such distributions in the surface atmospheric layer of the Earth remains relevant, due to the fact that they are concentrated in the human environment and have a direct impact on the health of the population. This work is devoted to the study of beta-spectra of the natural radiation background in the surface atmospheric layer of the Earth. The origin of the measured beta spectra is associated with the daughter products of the decay of radon isotopes Rn-219, Rn-220, Rn-222 in three natural radioactive series. The spectra were measured from October 2018 to October 2019 in the foothills of the Zailiysky Alatau Tien Shan in Almaty. The frequency of measurements averaged about 10 measurements per day with an exposure of at least 2000 s. A database of daily, seasonal and annual variations in beta spectra has been accumulated. For the analysis of the data obtained, a special software “Analyzer of the Beta Spectra Array” was developed, which made it possible to process the standard output files of the “Sputnik” spectrometric installation and to integrate each spectrum in a given time interval. Time variation over the measured period was described using a standard mathematical computer package for wavelet analysis. The wavelet spectra obtained as a result of integration are used to identify daily, seasonal, and annual effects in variations of beta emanations. Along with this, similar mathematical processing was carried out to predict the impact of external factors in temporal variations of beta particles.