_(72)^(178)Hf和_(72)^(179)Hf稀土核高K低激发带  

Low-Lying Excited High-K Multi-quasiparticle Bands in ^(178,179)Hf

作　　者：龚伦训[1] 余雷[2] 

机构地区：[1]北京大学物理学院,北京100871 [2]贵州师范大学物理系,贵阳550001

出　　处：《高能物理与核物理》2005年第10期960-963,共4页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10375001;10435010)资助~~

摘　　要：用处理推转壳模型的粒子数守恒(PNC)方法,分析了稀土变形核178,179Hf的基态带和低激发高K多准粒子带的运动学转动惯量J(1)随角频率ω的变化及其微观机制,特别是被拆散核子的Pauli堵塞效应的重要影响.本文分析和计算了72178Hf的2准粒子和4准粒子及72179Hf的3准粒子的高K低激发带.实验观测到的J(t)随ω的变化,在PNC计算中得到较好的重现.分析表明,高K多准粒子带的J(1)随ω的变化与基态带的不同,主要来自高N(j)闯入态的堵塞效应.Using the particle-number conserving （PNC） method for treating the cranked shell model, the microscopic mechanism of the variation with rotational frequency w of the kinematics moments of inertia for the rare-earth deformed nuclei ^178,179Hf is investigated. The 2-qp and 4-qp bands in （^178）（72）Hf and 3-qp bands in （^179）（72）Hf are analyzed and calculated. The observed ω variation of J（1） is reproduced satisfactorily in PNC calculations. Our analysis shows that the difference between the ω variations of J（1） for the high K multi-quasiparticle bands and for the ground state band is mainly due to the Pauli blocking effects of high j intruder orbitals near the Fermi surface.

关 键 词：高K多准粒子激发带 转动惯量 粒子数守恒方法 堵塞效应 激发带 稀土核 粒子数守恒 推转壳模型 准粒子 微观机制 

分 类 号：O571.2[理学—粒子物理与原子核物理]