Journal of Experimental and Theoretical Physics最新文献_第3页

Universality of Nucleon–Nucleon Correlations in Nuclei and Cumulative Pion Production 核中核子-核子相关性的普遍性与累积负离子产生

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S106377612312021X

Yu. T. Kiselev

{"title":"Universality of Nucleon–Nucleon Correlations in Nuclei and Cumulative Pion Production","authors":"Yu. T. Kiselev","doi":"10.1134/S106377612312021X","DOIUrl":"10.1134/S106377612312021X","url":null,"abstract":"The structure of nuclear matter at short internucleon distances is one of the poorly studied aspects of nuclear physics. At distances of the order of the nucleon radius, nuclear matter is represented by the pairs of correlated nucleons with relative momenta exceeding the Fermi momenta that emerge for a short time. Such structures, whose local density is comparable to the density of neutron stars, arise from fluctuations in the average nuclear density. One of the important characteristics of nucleon–nucleon correlations is their universality implying the independence of their properties from the nuclear mass number. Therefore, the peculiarities of these objects of nuclear structure reflect the properties of nuclear matter rather than specific nuclei. Information about the short-distance physics is extracted from the analysis of processes with high energy–momentum transfers. Until now, the property of universality has been observed in electron–nucleus collisions only for the breakup of nucleon pairs. In this paper we analyze the data on the cumulative production of pions by protons on a set of nuclear targets and for the first time have established the existence of universality of two-nucleon correlations in the production of π+ and π– mesons. We have obtained evidence for the involvement of three-nucleon correlations in the production of pions beyond the kinematics of their production in interactions with two-nucleon objects.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 6","pages":"834 - 845"},"PeriodicalIF":1.0,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139579420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved Cosmological Bounds for Mixing Scenarios of Three Sterile Neutrino Generations 三代无菌中微子混合情景的改进宇宙学边界

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-26 DOI: 10.1134/S1063776123120051

M. N. Dubinin, D. M. Kazarkin

引用次数: 0

Light Absorption in Dichalcogenides of Transition Metals in Crossed Fields 过渡金属二卤化物在交叉场中的光吸收

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110067

L. I. Magarill, A. V. Chaplik

引用次数: 0

Growth Kinetics of 4He Quantum Crystals at a Temperature of 0.1–0.2 K 4He 量子晶体在 0.1-0.2 K 温度下的生长动力学

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110146

R. B. Gusev, V. L. Tsymbalenko

引用次数: 0

An Optical Analog for a Rotating Binary Bose—Einstein Condensate 旋转双玻色-爱因斯坦凝聚态的光学模拟物

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110092

V. P. Ruban

引用次数: 0

Zeeman Splitting of Excitons in GaAs/AlGaAs Quantum Wells in the Faraday Geometry 法拉第几何中 GaAs/AlGaAs 量子阱中激子的泽曼分裂

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110134

P. S. Grigoryev, M. A. Chukeev, V. A. Lovtcius, Yu. P. Efimov, S. A. Eliseev

引用次数: 0

Active Brownian Motion of Dust Particles in Quasi-One-Dimensional (Chain) Structures in a Glow Discharge 辉光放电中准一维（链）结构中尘埃粒子的主动布朗运动

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S106377612311016X

A. S. Svetlov, E. A. Kononov, F. M. Trukhachev, M. M. Vasiliev, O. F. Petrov

{"title":"Active Brownian Motion of Dust Particles in Quasi-One-Dimensional (Chain) Structures in a Glow Discharge","authors":"A. S. Svetlov, E. A. Kononov, F. M. Trukhachev, M. M. Vasiliev, O. F. Petrov","doi":"10.1134/S106377612311016X","DOIUrl":"10.1134/S106377612311016X","url":null,"abstract":"We present the experimental results of our study of the formation and dynamics of chain structures by active Brownian particles in a DC glow discharge. The mechanism of active particle motion is associated with the conversion of laser radiation by particles into the energy of their own (nonthermal) motion. Through our analysis of the motion parameters (the trajectories, the root-mean-square displacement, the kinetic energy) as a function of the intensity of laser radiation incident on the particles, we have shown that the particles are active Brownian ones. It is possible to control their motion without changing the discharge parameters. It has been experimentally found that the formation of chain structures and their stable state are not violated under kinetic heating of the particles as their kinetic energy increases by more than an order of magnitude. This suggests the realization of a mechanism for the formation of chains with a strong coupling between the particles that is not explained by the simple (ion) wake behind the upstream particle.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 5","pages":"615 - 621"},"PeriodicalIF":1.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462254","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of Monte Carlo Event Generators of pp Collisions at NICA Energies NICA 能量下pp对撞蒙特卡洛事件发生器的性能

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S106377612311002X

M. Yu. Azarkin, M. R. Kirakosyan

引用次数: 0

Spin States of Cobalt Ions and a Metal–Semiconductor Transition in Layered Cobaltites PrBaCo2O5 + δ (δ = 0.52, 0.74) 钴离子的自旋态和层状钴矿 PrBaCo2O5 + δ（δ = 0.52，0.74）中的金属-半导体转变

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110109

N. I. Solin, S. V. Naumov, A. V. Korolev, V. R. Galakhov

{"title":"Spin States of Cobalt Ions and a Metal–Semiconductor Transition in Layered Cobaltites PrBaCo2O5 + δ (δ = 0.52, 0.74)","authors":"N. I. Solin, S. V. Naumov, A. V. Korolev, V. R. Galakhov","doi":"10.1134/S1063776123110109","DOIUrl":"10.1134/S1063776123110109","url":null,"abstract":"The spin states of Co atoms in PrBaCo2O5 + δ with regard to the paramagnetic contribution of Pr3+ ions have been determined from magnetic property studies for δ = 0.52 and 0.74. Results obtained without considering the paramagnetic contribution of Pr3+ ions are inconsistent with available experimental data. With a decrease in temperature, the metal–insulator transition in PrBaCo2O5.52 becomes sharper according to a sharp change in spin states (from HS/LS to LS/IS) of Co3+ ions. In this case, Co3+ ions occupying octahedra pass from the high-spin state (HS, S = 2) to the low-spin one (LS, S = 0) and those occupying pyramids pass from the LS-state to the intermediate spin state (IS, S = 1), as follows from the available structural data. In PrBaCo2O5.74, the metal–semiconductor transition occurs smoothly from HS/LS to the HS/IS state upon the smooth transition of the Co3+ ion state from (LS, S = 0) to the (IS, S = 1) state in pyramides without change in the spin state of ions Co3+ (HS, S = 2) and Co4+ (LS, S = 1/2) in octahedrons.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 5","pages":"664 - 674"},"PeriodicalIF":1.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Asymptotic Theory of Solitons Generated from an Intense Wave Pulse 强波脉冲产生孤子的渐近理论

IF 1 4区物理与天体物理

Journal of Experimental and Theoretical Physics Pub Date : 2024-01-12 DOI: 10.1134/S1063776123110043

A. M. Kamchatnov

{"title":"Asymptotic Theory of Solitons Generated from an Intense Wave Pulse","authors":"A. M. Kamchatnov","doi":"10.1134/S1063776123110043","DOIUrl":"10.1134/S1063776123110043","url":null,"abstract":"A theory of conversion of an intense initial wave pulse into solitons for asymptotically long evolution times has been developed using the approach based on the fact that such a transformation occurs via an intermediate stage of formation and evolution of dispersion shock waves. The number of nonlinear oscillations in such waves turns out to be equal to the number of solitons in the asymptotic state. Using the Poincaré–Cartan integral invariant theory, it is shown that the number of oscillations equal to the classical action of a particle associated with the wave packet in the vicinity of the small-amplitude edge of a dispersion shock wave remains unchanged upon a transfer by a flow described by a nondispersive limit of the nonlinear wave equations considered here. This makes it possible to formulate a generalized Bohr–Sommerfeld quantization rule that determines the set of “eigenvalues” associated with soliton physical parameters in the asymptotic state (in particular, with their velocities). In the theory, the properties of full integrability of nonlinear wave equations are not used, but the corresponding results are reproduced in this case also. The analytical results are confirmed by numerical solutions to nonlinear wave equations.","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":"137 5","pages":"732 - 745"},"PeriodicalIF":1.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0