稀土核低激发态增强E1强度的起源
Origin of Low-Lying Enhanced E1 Strength in Rare-Earth Nuclei
摘要：
稀土原子核在4 MeV以下的实验$E1$强度分布表明了同位旋对称性的局部破缺。除了八极子态外，通过（$γ,γ'$）实验在稀土核中还观察到了E1强度增强的$1^-$态。通过再现实验结果，spdf相互作用玻色子模型的计算为中等质量核中$α$团簇的形成提供了进一步的证据，并可能对低E1强度的起源提供新的理解.
英文摘要：
The experimental $E1$ strength distribution below 4 MeV in rare-earth nuclei suggests a local breaking of isospin symmetry. In addition to the octupole states, additional $1^-$ states with enhanced E1 strength have been observed in rare-earth nuclei by means of ($γ,γ'$) experiments. By reproducing the experimental results, the spdf interacting boson model calculations provide further evidence for the formation of an $α$ cluster in medium-mass nuclei and might provide a new understanding of the origin of low-lying E1 strength.
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