Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session Q02: Towards the Thorium Nuclear Clock
8:00 AM–10:00 AM,
Thursday, June 3, 2021
Chair: Eric Hudson, UCLA
Abstract: Q02.00002 : Electronic bridge processes in the 229mTh isomer*
8:30 AM–9:00 AM
The talk will follow the newest theoretical developments on employing electronic bridge processes for the driving or quenching of the nuclear clock transition. The electronic bridge is one of the mechanism coupling the nuclear isomeric transition to the electronic shell. First, we will discuss the prospects of electronic bridge in highly charged 229Th ions. This process can be used to populate the Th isomer in highly charged ions produced in an electron beam ion trap using a tunable UV laser. With the absorbed laser photon energy directly related to the isomer energy, this mechanism promises the determination of the latter with an improved accuracy of 10−4 eV and is feasible under presently available experimental parameters . Second, an alternative electronic bridge process in crystals will be introduced. In VUV-transparent crystals this process is facilitated by defects, i.e., states appearing in the band gap close to the isomeric energy and caused by the Th doping itself. Excitation rates far above direct photoexcitation can be achieved with current technology . The impact of using electronic bridge to quench the isomeric state for the accuracy of a future nuclear clock is discussed.
 P. V. Bilous et al., Phys. Rev. Lett. 124, 192502 (2020).
 B. S. Nickerson et al., Phys. Rev. Lett. 125, 032501 (2020).
*This work is part of the ThoriumNuclearClock projectthat has received funding from the European ResearchCouncil (ERC) under the European Unions Horizon 2020research and innovation programme (Grant agreementNo. 856415).
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
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