Energy of the ^{229}Th Nuclear Clock Isomer Determined by Absolute γ-ray Energy Difference.

@article{Yamaguchi2019EnergyOT,
  title={Energy of the ^\{229\}Th Nuclear Clock Isomer Determined by Absolute $\gamma$-ray Energy Difference.},
  author={A. Yamaguchi and H. Muramatsu and T. Hayashi and N. Yuasa and K. Nakamura and M. Takimoto and H. Haba and K. Konashi and M. Watanabe and H. Kikunaga and K. Maehata and N. Yamasaki and K. Mitsuda},
  journal={Physical review letters},
  year={2019},
  volume={123 22},
  pages={
          222501
        }
}
The low-lying isomeric state of ^{229}Th provides 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-keV γ ray. Together with… Expand

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