论文标题
$^{18} $ o的低能偶极激发模式与反对称分子动力学
Low-energy dipole excitation mode in $^{18}$O with antisymmetrized molecular dynamics
论文作者
论文摘要
在$^{18} $ O中的低能偶极（LED）激发使用$ k $ - 投影后的变化组合在反对称分子动力学的框架内使用$β$ -Constraint与生成器坐标方法进行了研究。我们获得了两个LED状态，即具有$ 1_1^ - $状态具有主导壳模式结构，$ 1_2^ - $状态具有大$^{14} \ textrm {C}+α$ cluster组件。这两种状态都有明显的环形偶极子（TD）和压缩偶极子（CD）强度，表明TD和CD模式不分开，而是在$^{18} $ O的LED激发中混合。这与诸如$^{10} $的CD和TD模式不同，其中CD和TD模式分别以$ k^π= 0^ - $和$ k^π= 1^ - $兴奋状态生成。
Low-energy dipole (LED) excitations in $^{18}$O were investigated using a combination of the variation after $K$-projection in the framework of antisymmetrized molecular dynamics with $β$-constraint with the generator coordinate method. We obtained two LED states, namely, the $1_1^-$ state with a dominant shell-model structure and the $1_2^-$ state with a large $^{14}\textrm{C}+α$ cluster component. Both these states had significant toroidal dipole (TD) and compressive dipole (CD) strengths, indicating that the TD and CD modes are not separated but mixed in the LED excitations of $^{18}$O. This is unlike the CD and TD modes for well-deformed nuclei such as $^{10}$Be, where the CD and TD modes are generated as $K^π=0^-$ and $K^π=1^-$ excitations, respectively, in a largely deformed state.
