分类: 物理学 >> 基本粒子与场物理学 提交时间: 2017-08-24
摘要: We study the energy level statistics of the states in U(5) and O(6) dynamical symmetries of the interacting boson model and the high spin states with backbending in U(5) symmetry. In the calculations, the degeneracy resulting from the additional quantum number is eliminated manually. The calculated results indicate that the finite boson number N effect is prominent. When N has a value close to a realistic one, increasing the interaction strength of subgroup O(5) makes the statistics vary from Poisson-type to GOE-type and further recover to Poisson-type.
分类: 物理学 >> 基本粒子与场物理学 提交时间: 2017-08-24
摘要: We study the energy level statistics of the states in E(5) and X(5) dynamical symmetries. The calculated results indicate that the statistics of E(5) symmetry is regular and follows Poisson statistics, while that of X(5) symmetry involves two maxima in the nearest neighbor level spacing distribution P(s) and the ∆3 statistics follows the GOE statistics. It provides an evidence that the X(5) symmetry is at the critical point exhibiting competing degrees of freedom
分类: 物理学 >> 凝聚态:结构、力学和热性能 提交时间: 2016-05-08
摘要: Phase separation of two-component untrapped and trapped Bose gases at finite temperature is studied. Conditions for the stability of a homogeneous binary Bose gas mixture at finite temperature and the density profile of the trapped binary mixture are obtained. Our extended results include the known results for zero temperature.
分类: 物理学 >> 凝聚态:结构、力学和热性能 提交时间: 2016-05-08
摘要: The Bose-Einstein gas in an external potential is studied by means of the local-density approximation. An analytical result is derived for the dependence ofthe critical temperature of Bose-Einstein condensation on the mutual interaction in a generic power-law potential.