全同多准粒子转动带的内部结构  

Microscopic Mechanism of Identical Multi-quasiparticle Bands

作　　者：雷奕安[1] 曾谨言[1] 赵恩广[1] 

机构地区：[1]中国科学院理论物理研究所,北京100080

出　　处：《高能物理与核物理》1997年第3期227-234,共8页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金;中国博士后基金;中国科学院特别基金资助.

摘　　要：用粒子数守恒方法研究了全同带的内部结构.几乎全同转动惯量的出现是下列三种效应竞争的结果:即壳效应(包括形变的改变)、配对(反顺排)效应和堵塞(反配对)效应.粒子数守恒方法计算出的全同多准粒子带的转动惯量与实验值符合很好,计算中无自由参数.Identical one-quasiparticle and two-quasiparticle bands in neighboring odd-and even-mass nuclei are recognized.The intrinsic structure of identical bands is demonstrated by using the particle-number-conserving (PNC) treatment.The occur- rence of almost identical moments of inertia is the result of competition among the shell effect (including shape variation),pairing (anti-alignment) effect and blocking (anti-pairing) effect.The observed moments of inertia of identical mul- ti-quasiparticle bands are reproduced quite well by the PNC calculation.

关 键 词：全同多准粒子带 堵塞效应 粒子数守恒方法 

分 类 号：O571.2[理学—粒子物理与原子核物理]