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A new method has been developed for describing and parameterizing the cross sections for the fission of heavy nuclei by neutrons and protons in energy range above 100 MeV. The expression for parameterization of the cross sections was obtained on the basis of phenomenological concept of decay modes of highly excited nuclei formed after the first fast stage of the nucleon–nucleus interaction. The developed method well reproduces the energy dependence of the fission cross sections predicting their weak dependence on the energy and type of the nucleon in the high-energy region.

An Erratum to this paper has been published: https://doi.org/10.1134/S1063778823960013

The basic principles of the architecture and construction of the electronic module for generating a zero-level trigger signal in the BM@N and SRC experiments on a fixed target with the extracted nuclear beam of the JINR Nuclotron are described. The trigger generation logic, including delay lines, is implemented on the Cyclone V FPGA. The system of control and monitoring programs is discussed.

Monte-Carlo simulation was used to study the background conditions which affect the performance of the trigger system of the BM@N experiment. A GEANT4 + QGSM software package was used for the simulation. The influence of the background from δ-electrons was estimated and measures to minimize this background were evaluated. Addition of lead shielding and a small change in the geometry of the target zone allow to reduce the background. The efficiency of the modified trigger system was calculated for Au+Au collisions as a function of the impact parameter. The efficiency is 100% for central and semi-central collisions.

Over the past several years, the possibilities for Russia's economic growth have been discussed widely. This problem is unquestionably topical. However, do material factors alone determine the well-being of a society and its people? Since the mid-1980s, the overwhelming majority of indicators of the psychological state of Russian society have been demonstrating a negative tendency, and this trend not only reflects on the citizens' sense of self but also creates obstacles on the way to the country's innovative development.

The Fourier harmonics,$$v_2$$v 2 and$$v_3$$v 3 of negative pions are measured at center-of-mass energy per nucleon pair of$$\\sqrt{s_{\\textrm{NN}}}$$s NN = 17.3 GeV around midrapidity by the CERES/NA45 experiment at the CERN SPS in 0–30% central PbAu collisions with a mean centrality of 5.5%. The analysis is performed in two centrality bins as a function of the transverse momentum$$\\mathrm {p_{\\textrm{T}}}$$p T from 0.05 GeV/ c to more than 2 GeV/ c . This is the first measurement of the$$v^{1/3}_{3}/v^{1/2}_{2}$$v 3 1 / 3 / v 2 1 / 2 ratio as a function of transverse momentum at SPS energies, that reveals, independently of the hydrodynamic models, hydrodynamic behavior of the formed system. For$$\\mathrm {p_{\\textrm{T}}}$$p T above 0.5 GeV/ c , the ratio is nearly flat in accordance with the hydrodynamic prediction and as previously observed by the ATLAS and ALICE experiments at the much higher LHC energies. The results are also compared with the SMASH-vHLLE hybrid model predictions, as well as with the SMASH model applied alone.

The results of a study of structure and mechanical properties of welding joints, superconducting characteristics of the material after joining of welded components of superconducting radio frequency cavities are presented. The paper also describes the results of testing of the RF 1.3 GHz single-cell niobium cavity manufactured in the PTI NAS Belarus.

The Fourier harmonics, v 2 and v 3 of negative pions are measured at center-of-mass energy per nucleon pair of s NN = 17.3 GeV around midrapidity by the CERES/NA45 experiment at the CERN SPS in 0–30% central PbAu collisions with a mean centrality of 5.5%. The analysis is performed in two centrality bins as a function of the transverse momentum p T from 0.05 GeV/ c to more than 2 GeV/ c . This is the first measurement of the v 3 1 / 3 / v 2 1 / 2 ratio as a function of transverse momentum at SPS energies, that reveals, independently of the hydrodynamic models, hydrodynamic behavior of the formed system. For p T above 0.5 GeV/ c , the ratio is nearly flat in accordance with the hydrodynamic prediction and as previously observed by the ATLAS and ALICE experiments at the much higher LHC energies. The results are also compared with the SMASH-vHLLE hybrid model predictions, as well as with the SMASH model applied alone.

A bstract First physics results of the BM@N experiment at the Nuclotron/NICA complex are presented on π + and K + meson production in interactions of an argon beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 A GeV. Transverse momentum distributions, rapidity spectra and multiplicities of π + and K + mesons are measured. The results are compared with predictions of theoretical models and with other measurements at lower energies.

A compact time-of-flight neutron spectrometer is developed as a part of the BM@N facility for study of energy spectra of neutrons at large angles, in the region of fragmentation of target spectator, with beams of heavy nuclei of Nuclotron in energy range of 2–4 GeV/nucleon. The concept of spectrometer and neutron detectors, and the study of the spectrometer performance in BM@N run with Xe-ion beam are discussed.