Energy of the 229 Th Nuclear Clock Isomer Determined by Absolute γ -ray Energy Difference
Energy of the 229 Th Nuclear Clock Isomer Determined by Absolute γ -ray Energy Difference
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由绝对γ射线能量差确定的第229核钟异构体的能量
DOI：
10.1103/physrevlett.123.222501
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发表时间：
2019
影响因子：
8.6
通讯作者：
and K. Mitsuda
中科院分区：
文献类型：
--
作者：
A. Yamaguchi;H. Muramatsu;T. Hayashi;N. Yuasa;K. Nakamura;M. Takimoto;H. Haba;K. Konashi;M. Watanabe;H. Kikunaga;K. Maehata;N.Y. Yamasaki;and K. Mitsuda
的低位同质异能态为原子核的高分辨率激光光谱学提供了独特的机会。我们确定这种异构态的能量，通过采取所需的激发能量之间的绝对能量差填充从基态的29.2千电子伏的状态和在其衰变到异构激发态的能量发射。过渡边缘传感器微量热计被用来测量的29.2 keV射线的绝对能量。结合最近研究中测量的29.2 keV态的跨带跃迁能量（）和分支比，确定异构体能量为。我们的结果与基于不同实验技术的最新测量结果相一致，进一步证实了的同质异能态在激光可及的真空紫外区。
The low-lying isomeric state ofprovides unique opportunities for high-resolution laser spectroscopy of the atomic nucleus. We determine the energy of this isomeric state by taking the absolute energy difference between the excitation energy required to populate the 29.2-keV state from the ground state and the energy emitted in its decay to the isomeric excited state. A transition-edge sensor microcalorimeter was used to measure the absolute energy of the 29.2-keVray. Together with the cross-band transition energy () and the branching ratio of the 29.2-keV state measured in a recent study, the isomer energy was determined to be. Our result is in agreement with the latest measurements based on different experimental techniques, which further confirms that the isomeric state ofis in the laser-accessible vacuum ultraviolet range.