9th Symposium on Frequency Standards and Metrology

Laser Spectroscopy of Triply Charged Thorium-229 Isomer Toward a Nuclear Clock

18 Oct 2023, 11:00

30m

Kingscliff, NSW, Australia

Invited Oral Molecular, Atomic, Ion and Nuclear Clocks Nuclear Clocks

Speaker

Atsushi Yamaguchi

Description

Toward a $^{229}$Th nuclear clock, we performed laser spectroscopy of the triply charged $^{229}$Th isomer ($^{229\rm{m}}$Th$^{3+}$) in an ion trap. The $^{229\rm{m}}$Th$^{3+}$ ions were obtained as a decay product of $^{233}$U. We determined the hyperfine constants of the electronic state of $^{229\rm{m}}$Th$^{3+}$ and derived the magnetic dipole and electric quadrupole moments of $^{229\rm{m}}$Th. We also investigated the nuclear decay lifetime of $^{229\rm{m}}$Th$^{3+}$ which was a key parameter to estimate the performance of a $^{229}$Th$^{3+}$ nuclear clock.

Presentation materials

SFSM_Abatract_Yamaguchi.pdf