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Energy of the 229Th Nuclear Clock Isomer Determined by Absolute γ-ray Energy Difference.
- Source :
-
Physical Review Letters . 11/29/2019, Vol. 123 Issue 22, p1-1. 1p. - Publication Year :
- 2019
-
Abstract
- The low-lying isomeric state of 229Th 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 229Th is in the laser-accessible vacuum ultraviolet range. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 123
- Issue :
- 22
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 140225124
- Full Text :
- https://doi.org/10.1103/PhysRevLett.123.222501