Th-229基态和7.6 eV同分异构态分裂的$α$灵敏度实验方法
A proposed experimental method to determine $α$-sensitivity of splitting between ground and 7.6 eV isomeric states in Th-229
摘要：
Th-229核近简并基态和第一激发态之间的7.6 eV电磁跃迁可能对精细结构常数$α= e^2/\hbar c$的电势变化非常敏感。然而，灵敏度是未知的，核计算是目前无法确定it. We提出的测量钍原子（或离子）与原子核之间的跃迁频率的差异在基态和第一激发（异构）状态。这将使得能够提取核电荷半径和异构体之间的电四极矩的变化，并因此以合理的精度提取异构体跃迁频率的$α$依赖性。
英文摘要：
The 7.6 eV electromagnetic transition between the nearly degenerate ground state and first excited state in the Th-229 nucleus may be very sensitive to potential changes in the fine-structure constant, $α= e^2/\hbar c$. However, the sensitivity is not known, and nuclear calculations are currently unable to determine it. We propose measurements of the differences of atomic transition frequencies between thorium atoms (or ions) with the nucleus in the ground state and in the first excited (isomeric) state. This will enable extraction of the change in nuclear charge radius and electric quadrupole moment between the isomers, and hence the $α$-dependence of the isomeric transition frequency with reasonable accuracy.
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