The effect of the two-nucleon excitation from p to sd shell is discussed on12 C and14C in the frame work of the nuclear shell model. The recently suggested shell-model Hamiltonian YSOX provides an suitable tool to inv...The effect of the two-nucleon excitation from p to sd shell is discussed on12 C and14C in the frame work of the nuclear shell model. The recently suggested shell-model Hamiltonian YSOX provides an suitable tool to investigate the 2hω excitation in psd region. Because the strength of the< pp|V |sdsd > interaction, which represents the interaction between the 0 and 2hω configurations, is considered in the construction of the Hamiltonian YSOX. The level of12 C is almost independent on the < pp|V |sdsd > interaction, but excitation energies of certain states in14 C are strongly affected by it.Further investigation shows that the percentage of 2hω configuration in these states is quite different from that of the ground state. The non-linear effects of the < pp|V |sdsd > interaction on the configurations and transition rates are also discussed.展开更多
A quantitative phase field method of multi-component diffusion-controlled phase transformations coupled with the Kim-Kim-Suzuki model was applied to study the effect of initial particle size distribution （PSD） in 3D...A quantitative phase field method of multi-component diffusion-controlled phase transformations coupled with the Kim-Kim-Suzuki model was applied to study the effect of initial particle size distribution （PSD） in 3D and space distribution in 2D on dissolution of α particles in Ti-6Al-4V alloy below β transus temperature in real time and length scale. The thermodynamic and mobility data were obtained from Thermo-Calc and DICTRA softwares, respectively. The results show that the volume fractions of α particles decay with time as： f =feq ＋ （f0 -feq） exp（-Ktn） for four cases of PSD. The sequence of dissolution kinetics from fast to slow is： uniform PSD, normal PSD, lognormal PSD and bimodal PSD. The space distribution is found to be a major factor affecting the dissolution kinetics and the microstructures. When the distance of the particles is less than critical value, the dissolution rates reduce with the decrease in distance. The Al and V concentration fields around the particles appear more obvious soft impingement.展开更多
基金National Natural Science Foundation of China(11305272)Specialized Research Fund for the Doctoral Program of Higher Education(20130171120014)+2 种基金Fundamental Research Funds for the Central Universities(14lgpy29)Guangdong Natural Science Foundation(2014A030313217)Pearl River S&T Nova Program of Guangzhou(201506010060)
文摘The effect of the two-nucleon excitation from p to sd shell is discussed on12 C and14C in the frame work of the nuclear shell model. The recently suggested shell-model Hamiltonian YSOX provides an suitable tool to investigate the 2hω excitation in psd region. Because the strength of the< pp|V |sdsd > interaction, which represents the interaction between the 0 and 2hω configurations, is considered in the construction of the Hamiltonian YSOX. The level of12 C is almost independent on the < pp|V |sdsd > interaction, but excitation energies of certain states in14 C are strongly affected by it.Further investigation shows that the percentage of 2hω configuration in these states is quite different from that of the ground state. The non-linear effects of the < pp|V |sdsd > interaction on the configurations and transition rates are also discussed.
基金support from the National Natural Science Foundation of China (Nos. 51601078 and 51201147)the National Key R&D Program of China (Grant No. 2016YFB0701302)+1 种基金the Informalization Construction Program of Chinese Academy of Science (INFO-115-B01)Shenyang Supercomputer Centers for the computational resource of Chinese Academy of Science
文摘A quantitative phase field method of multi-component diffusion-controlled phase transformations coupled with the Kim-Kim-Suzuki model was applied to study the effect of initial particle size distribution （PSD） in 3D and space distribution in 2D on dissolution of α particles in Ti-6Al-4V alloy below β transus temperature in real time and length scale. The thermodynamic and mobility data were obtained from Thermo-Calc and DICTRA softwares, respectively. The results show that the volume fractions of α particles decay with time as： f =feq ＋ （f0 -feq） exp（-Ktn） for four cases of PSD. The sequence of dissolution kinetics from fast to slow is： uniform PSD, normal PSD, lognormal PSD and bimodal PSD. The space distribution is found to be a major factor affecting the dissolution kinetics and the microstructures. When the distance of the particles is less than critical value, the dissolution rates reduce with the decrease in distance. The Al and V concentration fields around the particles appear more obvious soft impingement.
