Improved mechanical properties of oxide dispersion strengthened (ODS) steels, promising reactor core materials, are due to the high density of uniformly distributed nanosized oxide inclusions. Transformation of the nanostructure of ODS steels under irradiation determines their stability during operation in the reactor conditions. In this work, three ODS steels were studied: Eurofer ODS, 10Cr ODS, and KP-3 ODS with various alloying systems. In these steels, the chromium content varies from 9 to 14 at. %, as well as such alloying elements as V, Ti, Al, W and Mn are present in various ratios. The effect of irradiation with iron ions up to 3, 6, and 30 dpa at a temperature of 350°C was studied. Radiation-induced changes were analyzed by transmission electron microscopy and atomic probe tomography. Although the size of the inclusions under irradiation practically did not change, a decrease in their bulk density was observed. On the whole, the hardening of the ODS steels due to inclusions during irradiation to 30 dpa at 350°C changed insignificantly, which indicates their radiation resistance and low tendency of the studied ODS steels to low-temperature radiation hardening and embrittlement.

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 in the vacuum volume of the first tube. Another design of the tube contains a pulsed system for suppressing electronic conductivity using a pulsed magnetic field created by a conical spiral placed inside the tube.

For multisectional traveling wave linear electron accelerators, the acceleration of positrons from an electron-bombarded intersectional converter target is considered by comparison of the model with an experiment. For the accelerated positrons and their energy spectra, the dependence of maxima of these spectra on the initial phase shift of a microwave (which accelerates the positrons) and on the energy of accelerated positrons and the phase distributions of these positrons are obtained. The spectra of the initial positron energies are found, which are essential in obtaining the accelerated positron current at the maximum of their spectrum. To study giant resonances in atomic nuclei, the efficiencies of obtaining positrons with and without their acceleration at electron LINACs are compared.

A new accelerator complex NICA (Nuclotron-based Ion Collider fAcility) for the study of the collisions of heavy ions and polarized particles is under construction at JINR (Dubna, Russia). The main goal of the NICA physics program is the experimental investigation of the strongly interacting matter phase diagram in the poorly explored region of the maximal baryon density. As the experimental strategy, a detailed energy and system size scan will be performed with an emphasis to the yields, rapidity spectra, transverse momentum a well as azimuthal angle distributions for multiple probes from gammas to hypernuclei. In order to fulfill all project’s goals, the multipurpose detector MPD is designed as a high acceptance spectrometer allowing full reconstruction of high multiplicity events. In this paper, the MPD project at NICA is described, including the MPD physics cases, the MPD design and the status of project’s realization.

The article describes the TAIGA astrophysical complex (Tunka Advanced Instrument for cosmic ray physics and Gamma-ray Astronomy), the deployment of the first stage of which is completed in the Tunka valley, 50 km from lake Baikal. The scientific program of the complex, the first results and plans for further development of the complex are discussed.

The excess of multi-muon events in comparison with calculations which was found in many experiments at ultrahigh energies of extensive air showers (EAS) cannot be explained using contemporary models of hadron interactions. The existence of this excess was called the “muon puzzle”. One of the ways to solve this problem is the study of the energy characteristics of EAS muon component. For this purpose, the energy deposit of cosmic ray muon bundles is measured in the NEVOD-DECOR experiment. The registration of muon bundles in a wide range of zenith angles allows one to explore a wide range of energies of the primary particles of cosmic rays (from 10 to 1000 PeV) in frame of a single experiment. The results of the measurements of the energy deposit of bundles over a long observation period are presented.

Recent results on search and study of the exotic states at D0 experiment (FNAL, USA) are presented in this paper. This includes a search and study of the state in semi-inclusive -hadron decays, search for prompt production of the state in interactions. The results of a search for inclusive production of the pentaquark states and at D0 experiment are also included to this paper.