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arXiv 1902.10962nucl-th
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${}^{10}$ Be的低能偶极激发模

Low-energy dipole excitation modes in ${}^{10}$Be

Yuki Shikata, Yoshiko Kanada-En'yo, Hiroyuki Morita

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20 pages, 8 figures
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摘要：

基于生成坐标方法，采用$α+ {}^6$ He和$α+ α+ 2n$团簇模型，研究了${}^{10}$ Be的低能偶极激发.在$E_{x} < 15$ ~MeV的能量范围内，我们得到了三个$1^-$态，它们在$E1$、压缩偶极和环形偶极跃迁强度上表现出不同的特征.我们发现在$1_1^-$态有强的环形偶极跃迁，在$1^-_2$态有显著的$E1$强度，在$1^-_3$态有强的$E1$和压缩偶极强度. $1^-_1$由$α+ {}^6$ He簇结构描述，其中$1^-_2$和$1^-_3$状态由$α+ α+ 2n$簇的三体激发理解。

英文摘要：

Low-energy dipole excitations in ${}^{10}$Be were investigated based on the generator coordinate method with $α+ {}^6$He and $α+ α+ 2n$ cluster models. We obtained three $1^-$ states in $E_{x} < 15$~MeV, which show different characters in the $E1$, compressive dipole, and toroidal dipole transition strengths. We found the strong toroidal dipole transition in the $1_1^-$ state, remarkable $E1$ strength in the $1^-_2$ state, and the strong $E1$ and compressive dipole strength in the $1^-_3$ state. The $1^-_1$ is described by the $α+ {}^6$He cluster structure, where as the $1^-_2$ and $1^-_3$ states are understood by three-body excitations of the $α+ α+ 2n$ clustering.

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