Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya最新文献_第4页

Photonuclear legacy of the research group headed by B. S. Ishkhanov 由b.s.伊什哈诺夫领导的研究小组的光核遗产

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-16 DOI: 10.55959/msu0579-9392.78.2330201

Kapitonov I. M.

引用次数: 0

Questions of mathematical modelling in the study of acid retardation on ion–exchange resins 离子交换树脂酸缓蚀研究中的数学建模问题

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-16 DOI: 10.55959/msu0579-9392.78.2330102

Kaznacheev M. A.

{"title":"Questions of mathematical modelling in the study of acid retardation on ion–exchange resins","authors":"Kaznacheev M. A.","doi":"10.55959/msu0579-9392.78.2330102","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2330102","url":null,"abstract":"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.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135623022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics of passive admixture in surface and subsurface external deformation field above an ocean guyot 海面上地表和地下外部变形场的被动混合动力

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-16 DOI: 10.55959/msu0579-9392.78.2330901

Shatokhin M. V., Sokolovskiy M. A.

引用次数: 0

Status of experimental photonuclear results 实验光核结果的现状

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-16 DOI: 10.55959/msu0579-9392.78.2330206

Varlamov V.V., Davydov A.I., Orlin V.N.

{"title":"Status of experimental photonuclear results","authors":"Varlamov V.V., Davydov A.I., Orlin V.N.","doi":"10.55959/msu0579-9392.78.2330206","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2330206","url":null,"abstract":"Absolute majority of data on photonuclear reaction cross sections was obtained in experiments using bremsstrahlung and quasimonoenergetic photons produced at annihilation in flight of relativistic positrons. There are significant disagreements both in absolute value and shape between the results of experiments of both types. So, the pronounced structural features are clearly observed in the cross sections obtained using bremsstrahlung but those are practically absent in the cross sections obtained on the beams of annihilation photons. The disagreements in absolute values are definitely systematic: they are directly dependent on the data retrieval method and significantly exceed the statistical errors achieved in experiments. There are also the significant disagreements between the data obtained in experiments of the same type. In combined systematic investigations of many data on various photonuclear (primarily, photoneutron) reaction, both total and partial, cross sections the possible reasons for disagreements between the results of photonuclear experiments were found out, the status of those experiments and methods of accounting and elimination of observed disagreements are discussed.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135623027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sputtering of CuPt alloy CuPt合金的溅射

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320301

V.S. Chernysh, D.K. Minnebaev, D.S. Kireev

引用次数: 0

Velocity distributions of forward moving fragments in heavy-ion collisions at Fermi energies 费米能量下重离子碰撞中向前运动碎片的速度分布

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310301

T.I. Mikhailova, B. Erdemchimeg, Yu.M. Sereda

{"title":"Velocity distributions of forward moving fragments in heavy-ion collisions at Fermi energies","authors":"T.I. Mikhailova, B. Erdemchimeg, Yu.M. Sereda","doi":"10.55959/msu0579-9392.78.2310301","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2310301","url":null,"abstract":"Heavy-ion-induced projectile fragmentation reactions at Fermi energies are of interest to investigate the properties of nuclei far from the valley of stability, nuclear potentials, to get knew knowledge about nuclear equation of state. Isotopes far from stability line can be useful for various applications. It is therefore of interest to predict relative yields of isotopes and their energies with high precision. Here we treat such reactions in a microscopic approach, which consists of several steps: initialization of ground states of the colliding nuclei, dynamical evolution until the freeze-out point where the primary fragments can be identified, calculation of the excitation energy of the primary fragments, and their de-excitation. For the dynamical evolution we use a Boltzmann–Vlasov type transport equation, and for the de-excitation a statistical multi-fragmentation description. We apply this approach to collisions of projectile nuclei 40Ar on target 9Be at energy 36.5 A MeV, obtain isotope distributions and velocity spectra of the produced isotopes and compare the results of our calculations to experimental data obtained at COMBAS set-up in JINR.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136039534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent progress in description of NN–scattering with the dibaryon model of nuclear forces 核力双重子模型描述nn散射的最新进展

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310601

O. A. Rubtsova, V. N. Pomerantsev, M. N. Platonova

引用次数: 0

A novel approach for taking into account the zero-point oscillations in calculating heavy-ion fusion cross-sections 在计算重离子聚变截面时考虑零点振荡的新方法

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2310302

M. V. Chushnyakova, I. I. Gontchar

{"title":"A novel approach for taking into account the zero-point oscillations in calculating heavy-ion fusion cross-sections","authors":"M. V. Chushnyakova, I. I. Gontchar","doi":"10.55959/msu0579-9392.78.2310302","DOIUrl":"https://doi.org/10.55959/msu0579-9392.78.2310302","url":null,"abstract":"Earlier in the literature it was shown that accounting for the zero-point oscillations (ZPO) of the shape of colliding atomic nuclei results in significant increasing of the calculated sub-barrier capture (fusion) crosssections. However, calculations of such kind were performed in a simplified way with the schematic nucleus– nucleus potential. The purpose of the present paper is to estimate in an accurate way the sub-barrier capture cross-sections in collisions between oxygen-16 and spherical nuclei with the realistic potential and to compare the calculated cross-sections with the experimental data. Nucleus-nucleus potential is obtained within the doublefolding model with Paris M3Y nucleon–nucleon effective forces. The nucleon densities are taken from the IAEA data base (they are calculated using the Hartree–Fock–Bogoliubov method and approximated by two-parameter Fermi profile). The transmission coefficients are calculated within the WKB approximation below the Coulomb barrier and within parabolic barrier approximation above it. A novel approach for taking into account the ZPO without any fitting parameters is proposed. It is demonstrated that ignoring the ZPO results in underestimating the experimental data whereas accounting for ZPO improves the agreement of the calculated cross-sections with the experimental ones.","PeriodicalId":484854,"journal":{"name":"Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136039535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study of the motion of a shock wave in the plasma of a pulsed volume discharge in air 空气中脉冲体积放电等离子体中激波运动的实验研究

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320601

A. A. Ivanova, I. V. Mursenkova

引用次数: 0

Finite voxel size compensation for microprinting of parabolic X-ray lenses by two-photon lithography 抛物面x射线透镜双光子光刻微印的有限体素尺寸补偿

Vestnik Moskovskogo Universiteta Seriya 3 Fizika Astronomiya Pub Date : 2023-06-02 DOI: 10.55959/msu0579-9392.78.2320401

M. I. Sharipova, T. G. Baluyan, A. S. Sverchkov, D. A. Shilkin, V. O. Bessonov, A. A. Fedyanin

引用次数: 0