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颗粒流动广泛存在于自然现象和工程应用中，无论是山体坍塌还是工程上球床模块式高温气冷堆和中国科学院近代物理研究所提出的新型流态固体颗粒靶概念。本文基于适用于处理大变形问题的物质点法（MPM），采用μ(I)流变模型，实现了用连续性方法模拟密集颗粒流动的计算框架，并模拟了颗粒坍塌实验和漏斗流动现象，数值模拟结果与实验结果、DEM计算结果均吻合较好。本文采用的连续性本构和MPM能有效模拟密集颗粒流动。可在...
基于隐式重启Arnoldi算法一维平板堆λ和瞬发α本征值问题谐波计算分析
中子扩散方程 本征值问题 隐式重启Arnoldi算法 一维平板反应堆
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2018/10/8
中子平衡方程的谐波中子注量率及其本征值在中子时空动力学谐波展开法和外源驱动次临界反应堆中子学空间效应研究中有重要应用价值.本文推导了λ和瞬发α本征值问题的关系,并基于一维平板反应堆扩散问题,采用隐式重启Arnoldi算法(IRAM)进行了λ和α本征值问题计算.结果表明,给出的前10阶本征值数值与解析解符合较好,最大相对偏差小于3%；在λ本征值问题吸收截面中增加时间吸收项αp,n/v后,得到的n阶本...
矩形窄通道内流动沸腾阻力实验与计算方法研究。
A direct microscopic approach to transition strengths in pre-equilibrium reactions
microscopic approach to transition pre-equilibrium reactions
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2011/7/20
We present a microscopic formalism that extends the traditional formulation of Williams, Ericson and Bloch and permits to obtain the transition strengths (TS) of pre-equilibrium nuclear reactions dire...
Effect of isospin dependent cross-section on elliptic flow in heavy-ion collision at intermediate energies
heavy-ion collision cross-section isospin dependent
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2011/7/20
We study the elliptical flow of fragment in heavy-ion collisions for different systems at incident energies between 40 and 1200 MeV/nucleon using an isospin-dependent quantum molecular dynamics model....
Low and medium energy deuteron-ind ced reactions on $^{63,65}$Cu nuclei
Low medium energy deuteron-ind ced reactions nuclei
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2011/7/20
The activation cross sections of (d,p), (d,2n), (d,3n), and (d,2p) reactions on 63,65Cu were measured in the energy range from 4 to 20 MeV using the stacked-foils technique. Then, following the availa...
Low energy ω(\to π^0 γ) meson photoproduction in the nucleus
Low energy meson photoproduction nucleus
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2011/7/21
The $\pi^0 \gamma$ invariant mass distribution spectra in the $ (\gamma, \pi^0\gamma) $ reaction were measured by TAPS/ELSA collaboration to look for the hadron parameters of the $\omega$ meson in Nb ...
Fusion of $^{6}$Li with $^{159}$Tb} at near barrier energies
Li Tb barrier energies
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2011/7/20
Complete and incomplete fusion cross sections for $^{6}$Li+$^{159}$Tb have been measured at energies around the Coulomb barrier by the $\gamma$-ray method. The measurements show that the complete fusi...
Transport-theoretical Description of Nuclear Reactions
Transport-theoretical Description Nuclear Reactions
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2011/7/21
In this review we first outline the basics of transport theory and its recent generalization to off-shell transport. We then present in some detail the main ingredients of any transport method using i...
Localization in light nuclei
Localization light nuclei
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2011/1/6
We investigate the presence of spatial localization in nuclei using a method that maps the nucleon same-spin pair probability and is based on the density-matrix. The method is used to study spatial lo...
Thermal and Epithermal Neutron Fluence Rates in the Irradiation Facilities of the TRIGA IPR-R1 Nuclear Reactor
TRIGA IPR-R1 nuclear reactor neutron fluence rate neutron activation analysis irradiation facilities
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2010/6/30
The TRIGA IPR-R1 nuclear reactor at the Centro de Desenvolvimento da Tecnologia Nuclear CDTN/CNEN, Belo Horizonte, Brazil, has three irradiation facilities: a rotary specimen rack outside the reactor ...
对输入小阶跃反应性（ρ0〈β）、有热传递和温度反馈时反应堆缓发超临界过程进行了研究。提出了一个新的物理模型，由数值计算求出任意初始功率条件下反应堆反应性、功率随时间的变化规律，并进行分析讨论，给出了一些有益的新结果。
Formation of Superheavy Nuclei in Massive Fusion Reactions
DNS model massive fusion reaction evaporationresidue excitation function
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2009/10/29
Within the concept of the dinuclear system(DNS), by incorporating the coupling of the relative motion to the nucleon transfer process, a dynamical model is proposed for describing the formation o...
Inflight (K-, N) Reactions for Study of Kaonnucleus Interaction
neutron star；kaon condensation；kaonnucleus interaction
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2009/10/28
We would like to emphasize that the inflight (K-, N) reactions are particularly useful for the study of the Knucleus interaction. Since the reaction mechanism is well known, there is little ambi...
基于CDCC理论对氘核破裂效应进行初步研究
氘核破裂 CDCC理论
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2009/10/28
为研究氘核的破裂效应对弹性散射角分布和反应截面的影响， 基于连续离散化耦合道 (CDCC) 理论编制了程序CDCCOM。 从中心点波函数的初始值出发， 利用P3C5算法求解耦合道方程组， 进而通过边界点上内、 外区的波函数相匹配求得S矩阵元。 P3C5算法提高了计算精度， 同时验证了程序CDCCOM的有效性。 通过与其他工作的计算结果及实验数据进行比较， 认为在氘核入射能量低于200 MeV的情况...