A study of the reaction of inelastic scattering of 14.1 MeV neutrons by 23 Na nuclei was carried out at the TANGRA facility using the tagged neutron method. In this work, the energies of visible g-transitions are determined, the yields of g -quanta are obtained, the angular distributions of g -quanta for 23 Na are measured. The results obtained are in good agreement with the data of other published experimental works.

This paper is dedicated to n+C-12, n+Mg-24, n+Cr-52 -reactions investigation at 14.1 MeV neutron energy. Characteristics of these reactions have been calculated using TALYS code to estimate perspectives of using of this code in data interpretation in the TANGRA project. This project is performed in Frank Laboratory of Neutron Physics (FLNP JINR) to investigate properties of (n,xy)-type reactions, important for fundamental and practical applications.

The results obtained by measuring the angular and energy distributions of gamma rays produced in reactions induced by the inelastic scattering of 14.1-MeV neutrons on 27Al nuclei are presented. The respective measurements were performed by the tagged-neutron method in a beam from the ING-27 compact neutron generator. The angular distributions were obtained for gamma rays emitted from the 844-keV 1/2+, 1015-keV 3/2+, 2212-keV 7/2+, and 3004-keV 9/2+ states of 27 Al nuclei.

The characteristic gamma radiation from the interaction of 14.1 MeV neutrons with a natural silicon sample is investigated with Tagged Neutron Method (TNM). The anisotropy of gamma-ray emission of 1.779 MeV was measured at 11 azimuth angles with a step of ∠15°. The present results are in good agreement with some recent experimental data.

The results obtained by measuring the angular and energy distributions of gamma rays originating from the inelastic scattering of 14.1-MeV neutrons by carbon and oxygen nuclei are presented. The measurements in question were performed by the tagged-neutron method in a beam of an ING-27 standard portable neutron generator. The angular distributions of gamma rays emitted by the 2 + state of 12 С at 4.43 MeVand the 3 − state of 16 O at 6.13 MeV were obtained.

At the JINR Laboratory of Nuclear Physics, neutron–nucleus interactions are investigated for fundamental and applied purposes using the IREN pulsed neutron source. The applied research includes an elemental analysis of constituent materials of various devices. This paper describes the elemental-analysis techniques employed and reports the measurement of palladium abundances in the engine components of the Proton rocket carrier. The elemental-analysis technique involving resonance neutrons, currently implemented with the Romashka apparatus, is shown to be sensitive to palladium abundances at a level of 2 mg/g for samples with masses on the order of 60 g. Further developing the method will boost its sensitivity and allow for elemental analyses of larger samples and their assemblies.

We consider the stationary problem of the synthesis of a stabilization system by output. On solving this problem we use optimization methods, for which realization calculation of the gradient of the functional by the matrix of a feedback circuit is necessary. Calculation of the gradient of the functional with respect to scalar variables meets certain difficulties, which are caused by the necessity of calculation of the gradient with respect to every element of the feedback matrix. By means of the Kronecker product we suggest analytical expressions for calculation of the gradient by the feedback matrix. These expressions make it possible to solve problems of the synthesis of the optimal stabilization system by output for both continuous and discrete time.

This paper proposes a computational approach to the determination of an H2-optimal controller for a discrete-time linear system. This controller ensures the asymptotic stability of the system in the case of failure of one of the actuators.