首次发现稀土大变形核中的大电场强度
First identification of large electric monopole strength in well-deformed rare earth nuclei
摘要：
在慕尼黑MLL串列加速器上，通过“安全”库仑激发，填充了变形良好的稀土同位素$^{154}$ Sm和$^{166}$ Er的激发态。转换电子登记在一个冷却的Si（Li）检测器结合磁传输和过滤系统，迷你橙光谱仪。对于在1099 keV的$^{154}$ Sm中的第一激发$0^+$态，可以提取用于$ρ^2(\text{E0}; 0^+_2 \to 0^+_\text{g}) = 96(42)\cdot 10^{-3}$的基态的跃迁的大的强度值。这证实了在$^{154}$ Sm中的最低激发$0^+$态作为基态的集体$β$ -振动激发的解释。在$^{166}$ Er中，测得的$ρ^2(\text{E0}; 0^+_4 \to 0^+_1) = 127(60)\cdot 10^{-3}$的大的电致伸缩强度清楚地将1934 keV处的$0_4^+$状态确定为基态的$β$ -振动激发。
英文摘要：
Excited states in the well-deformed rare earth isotopes $^{154}$Sm and $^{166}$Er were populated via ``safe'' Coulomb excitation at the Munich MLL Tandem accelerator. Conversion electrons were registered in a cooled Si(Li) detector in conjunction with a magnetic transport and filter system, the Mini-Orange spectrometer. For the first excited $0^+$ state in $^{154}$Sm at 1099 keV a large value of the monopole strength for the transition to the ground state of $ρ^2(\text{E0}; 0^+_2 \to 0^+_\text{g}) = 96(42)\cdot 10^{-3}$ could be extracted. This confirms the interpretation of the lowest excited $0^+$ state in $^{154}$Sm as the collective $β$-vibrational excitation of the ground state. In $^{166}$Er the measured large electric monopole strength of $ρ^2(\text{E0}; 0^+_4 \to 0^+_1) = 127(60)\cdot 10^{-3}$ clearly identifies the $0_4^+$ state at 1934 keV to be the $β$-vibrational excitation of the ground state.
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