National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Phys Rev Lett. 2014 Feb 14;112(6):062503. doi: 10.1103/PhysRevLett.112.062503. Epub 2014 Feb 12.
We identify a potential means to extract the 229gTh→ 229mTh nuclear excitation energy from precision microwave spectroscopy of the 5F(5/2,7/2) hyperfine manifolds in the ion 229gTh3+. The hyperfine interaction mixes this ground fine structure doublet with states of the nuclear isomer, introducing small but observable shifts to the hyperfine sublevels. We demonstrate how accurate atomic structure calculations may be combined with the measurement of the hyperfine intervals to quantify the effects of this mixing. Further knowledge of the magnetic dipole decay rate of the isomer, as recently reported, allows an indirect determination of the nuclear excitation energy.
我们确定了一种从离子 229gTh3+ 的 5F(5/2,7/2)超精细磁谱中提取 229gTh→229mTh 核激发能的潜在方法。超精细相互作用将这个基态精细结构双峰与核同质异能态的状态混合在一起，引入了微小但可观察到的超精细子能级位移。我们展示了如何将精确的原子结构计算与超精细间隔的测量相结合，以量化这种混合的影响。最近报道的同质异能体磁偶极衰减率的进一步知识，允许间接确定核激发能。
