Energy of the Th 229 Nuclear Clock Isomer Determined by Absolute γ -ray Energy Difference

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, K. Mitsuda

研究成果: ジャーナルへの寄稿学術誌査読

23 被引用数 (Scopus)


The low-lying isomeric state of Th229 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 the cross-band transition energy (29.2 keV→ground) and the branching ratio of the 29.2-keV state measured in a recent study, the isomer energy was determined to be 8.30±0.92 eV. Our result is in agreement with the latest measurements based on different experimental techniques, which further confirms that the isomeric state of Th229 is in the laser-accessible vacuum ultraviolet range.

ジャーナルPhysical review letters
出版ステータス出版済み - 11月 26 2019

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)


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