^(130)Ce的电磁跃迁率和形变特性  

Electromagnetic Transition Rates and Deformation Feature in ^(130)Ce

作　　者：李广生[1] 杨利明[2] 戴征宇[1] 刘祥安[1] 张兰宽[1] 温书贤[1] 吴晓光[1] 袁观俊[1] 翁培 李生岗[1] 朱胜江[2] 杨春祥[1] 竺礼华[1] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]清华大学物理系,北京100084

出　　处：《高能物理与核物理》2002年第8期809-813,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (1 9975 0 70 );国家重点基础研究发展规划 (G2 0 0 0 0 7740 5 )资助~~

摘　　要：通过束流能量为 73MeV的116 Sn( 16 O ,2n) 130 Ce重离子反应 ,利用多普勒展宽峰的形状分析方法 ,测量了轻稀土核130 Ce激发态的寿命 .通过这些测量提取约化跃迁几率B(E2 ) .实验结果表明 ,在本工作中没有观察到过去报道的B(E2 )异常高的值 ;转晕带的跃迁四极矩随自旋而变化 ,呈现γ≈Lifetimes of the excited states in light rare earth nucleus 130 Ce have been measured using heavy ion reaction 116 Sn( 16 O,2n) 130 Ce at beam energy of 73MeV through analyzing the Doppler broadened line shapes. The reduced transition probabilities B (E2) are extracted from these measurements. The experimental results show that the previously reported anomalously high B (E2) value has not been observed in the present work. The transition quadrupole moment for the yrast band varies with spin and corresponds to a triaxial deformation with γ ≈7°.

关 键 词：^130Ce 电磁跃迁率 形变特性 寿命测量 跃迁四极矩 三轴形变 铈^130 原子核 轻稀土核 

分 类 号：O571.2[理学—粒子物理与原子核物理]