On the program of photonuclear research using the backward Compton quasi-monochromatic $\gamma$-quanta with tunable $E_\gamma$≲40 MeV
On the program of photonuclear research using the backward Compton quasi-monochromatic $\gamma$-quanta with tunable $E_\gamma$≲40 MeV
S. S. Belyshev$^1$, V. V. Varlamov$^2$, L. Z. Dzhilavyan$^3$, A. A. Kuznetsov$^{1,2}$, A. M. Lapik$^3$, A. L. Polonski$^3$, A. V. Rusakov$^3$, V. I. Shvedunov$^2$
Based on the analysis of development of photonuclear reaction studding at $E_{\gamma}≲40$ MeV and the unique parameters of the Compton source of ${\gamma}$-quanta under projecting, a program of priority photonuclear research using this source is proposed. The program includes research on: structures of giant E1 resonances and pygmy resonances; cross sections for partial photonucleon reactions; nuclear resonant fluorescence; photofission; problems of astrophysics and nucleosynthesis
Show AbstractOn monitoring on the under-development $\gamma$source based on backward Compton scattering for photonuclear research at $E_{\gamma}$ ≲ 40 MeV
On monitoring on the under-development $\gamma$source based on backward Compton scattering for photonuclear research at $E_{\gamma}$ ≲ 40 MeV
S. S. Belyshev$^1$, V. V. Varlamov$^2$, D. L. Zavenovich$^3$, A. A. Kuznetsov$^{1,2}$, A. M. Lapik$^3$, A. L. Polonski$^3$, A. V. Rusakov$^3$, V. I. Shvedunov$^2$
Based on a comparison of the parameters of the projected $\gamma$-source from back Compton scattering and the known ways of monitoring the beams of $\gamma$-quanta themselves to monitor the intensity and energy spectrum of $\gamma$-quanta in their beams at this $\gamma$-source in photonuclear studies in the region from several MeV to ~40 MeV, a system of scintillation plastic and inorganic detectors, as well as a pair magnetic spectrometer, was proposed.
Show AbstractQuestions of mathematical modelling in the study of acid retardation on ion–exchange resins
Questions of mathematical modelling in the study of acid retardation on ion–exchange resins
M. A. Kaznacheev
In this paper, the chemical equilibrium of a multicomponent solution is considered in detail as part of a dynamic model of the acid retardation method. A detailed study of the chemical equilibrium, represented as a system of nonlinear equations, is a key step for building an effective dynamic model in the case of a multicomponent solution. This paper presents an algorithm for efficient calculation of chemical equilibrium using extractive phosphoric acid as an example. This algorithm can be used in a dynamic model to calculate chemical equilibrium at each point of the spatial grid and at each integration step. Moreover, for the concentrations of substances in the experiment on the purification of extractive phosphoric acid, it is shown that the nonlinear system of equations of chemical equilibrium allows one to obtain simple algebraic relations for the connection of the concentration of molecules of the substance with the total concentration of substances of all elements in solution with good accuracy. In addition, it was shown that for each metal, only one type of salt sorption can be considered due to the low concentration of other types, which makes it possible to reduce the number of differential equations in the dynamic model of the acid retardation method.
Show AbstractGap recovery in the time series of CO$_2$ concentration and air temperature using methods of mathematical statistics
Gap recovery in the time series of CO$_2$ concentration and air temperature using methods of mathematical statistics
V. S. Aleshnovskii$^1$, A. V. Bezrukova$^2$, V. K. Avilov$^3$, V. A. Gazaryan$^{1,4}$, J. A. Kurbatova$^3$, O. A. Kuricheva$^3$, A. I. Chulichkov$^{1,5}$, N. E. Shapkina$^{1,6}$
The article is devoted to the problem of recovering gaps in the data series of experimental long-term continuous high-frequency observations of carbon dioxide concentration and air temperature. The study was carried out on the example of the results of observations of an automatic ecological and climatic station located in a tropical monsoon forest on the territory of south Vietnam (Dong Nai Nature Reserve). Omissions in the series of observations, as a rule, are random and are caused by technical malfunctions of the instrument base. Correctly recovered series of observations allow us to estimate the temporal variability of the observed parameters on different time scales. Within the framework of this study, options for recovering the continuity of time series based on the methods of mathematical statistics - autoregression (ARIMA) and the method of linear prediction were considered. A comparative analysis of the accuracy of restoring omissions by various methods is given.
Show AbstractOn the study of reaction yields of $^{13}$C($\gamma$, p)$^{12}$B, $^{14}$N($\gamma$, 2p)$^{12}$B, $^{14}$N($\gamma$, 2n)$^{12}$N through measurements of ($^{12}$B, $^{12}$N) activities with $\Delta E$-detector telescopes between electron accelerator pulses
On the study of reaction yields of $^{13}$C($\gamma$, p)$^{12}$B, $^{14}$N($\gamma$, 2p)$^{12}$B, $^{14}$N($\gamma$, 2n)$^{12}$N through measurements of ($^{12}$B, $^{12}$N) activities with $\Delta E$-detector telescopes between electron accelerator pulses
S. S. Belyshev$^1$, L. Z. Dzhilavyan$^2$, A. I. Karev$^3$, A. M. Lapik$^2$, A. L. Polonski$^2$, V. N. Ponomarev$^2$, A. V. Rusakov$^2$, A. A. Turinge$^2$
The possibilities are analyzed for studying the yields of reactions $^{13}$C($\gamma$, p)$^{12}$B, $^{14}$N($\gamma$, 2p)$^{12}$B, $^{14}$N($\gamma$, 2n)$^{12}$N by measuring the induced ($^{12}$B, $^{12}$N)-activity with telescopes of thin $\delta E$-detectors in time intervals between electron accelerator pulses. For production of ($^{12}$B, $^{12}$N)-nuclei and registration of their decay, estimates are given taking into account the parameters of the electron beam, Ta-radiator and irradiated targets made from graphite or NH$_4$NO$_3$, as well as the parameters of scintillation $\delta E$-detector telescopes made from thin plastic plates.
Show AbstractOn the probable interpretation of anticorrelation between the proton temperature and density in the solar wind
On the probable interpretation of anticorrelation between the proton temperature and density in the solar wind
Yu. V. Dumin$^1$, A. T. Lukashenko$^2$, L. M. Svirskaya$^3$
The anticorrelated distributions of temperature and density of protons are a well-known property of the solar wind. Nevertheless, it is unclear till now if they are formed by some kind of the universal physical mechanism? Unfortunately, a straightforward comparison of the characteristic relaxation times for temperature and density, on the one hand, and pressure, on the other hand, encounters the problem of inapplicability of the hydrodynamical approach in the situation when the free-path length of protons is considerably greater than the spatial scale of the structures under consideration. To resolve this problem, some kinds of the MHD turbulence - reducing the effective free paths - are usually assumed. In the present paper, we use an alternative approach based on the electrostatic (Langmuir) turbulence, described by the mathematical formalism of the spin-type Hamiltonians, which was actively discussed in the recent time in the literature on statistical physics. As follows from the corresponding calculations, formation of the anticorrelated distributions of temperature and density is a universal property of the strongly-nonequilibrium plasmas governed by the spin-type Hamiltonians when they gradually approach the thermodynamic equilibrium. So, just this phenomenon could be responsibly for the anticorrelations observed in the solar wind.
Show AbstractDynamics of passive admixture in surface and subsurface external deformation field above an ocean guyot
Dynamics of passive admixture in surface and subsurface external deformation field above an ocean guyot
M. V. Shatokhin$^1$, M. A. Sokolovskiy$^{1,2}$
Within the framework of a three-layer quasi-geostrophic model, a numerical study of the effect of an isolated submarine obstacle on the movement of surface and subsurface patches of a neutral admixture transfered by a vertically homogeneous zonal current was carried out. The possibility of partial capture of impurities by quasi-stationary topographic eddy in the vicinity of the submarine obstacle is shown. The role of the initial location (both horizontally and vertically) on the resulting pollution distribution pattern is revealed.
Show AbstractPhotoelectric charging of dust inprotoplanetary disks
Photoelectric charging of dust inprotoplanetary disks
T. I. Morozova, I. A. Kuznetsov
The process of ionization-recombination of gas and charging of dust particles under the action of X-rays under space plasma conditions is considered. The conditions are found when, as a result of exposure to radiation, dust particles in a protoplanetary disk can acquire a positive charge even with low gas ionization.
Show AbstractPhase transition temperature in some lattice models
Phase transition temperature in some lattice models
A. O. Shishanin
A method for calculating the phase transition temperature using only one cell is considered. This method has been tested for various lattice models: Ising model on triangular, hexagonal and tetrahedral lattices, three-position Potts model on a square lattice. In particular, exact replies are reproduced in the Ising model for square and triangular lattices. Also, this method was used to analyze some multi-spin models.
Show AbstractRefinement of the motion model of the Linus satellite of the asteroid (22) Kalliope
Refinement of the motion model of the Linus satellite of the asteroid (22) Kalliope
P. A. Budnikova$^1$, N. V. Emelyanov$^2$, B. S. Safonov$^2$
The aim of this article is to analyze the dynamics of the Linus satellite of the asteroid (22) Kalliope. New results have been obtained, and now they are being published. New observations of the satellite were made at the Caucasus Mountain Observatory of the SAI from October 2021 to March 2022. The obtained astrometric results are presented in the article. Based on the updated set of observations, the parameters of the satellite's orbit were re-determined. An increase in the accuracy of ephemeris with the addition of new observations is shown. A new attempt was made to determine the precession of the satellite's orbit caused by the compression of a rapidly rotating asteroid. The goal was to determine the dynamic compression of the central body. The entire observation interval is divided into groups. From the observations of each group the position of the axis of the satellite's orbit was found. Changing the position of the axis gives the desired precession. Studies on several examples show that the position of the axis from such groups of observations is determined very unreliably. The reason lies in the strong correlation between the determined parameters with limited observational accuracy. Ways of studying precession are outlined by joint determination of dynamic parameters on the basis of all available observations.
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