9th Symposium on Frequency Standards and Metrology

Session

Nuclear Clocks

18 Oct 2023, 10:30

Kingscliff, NSW, Australia

Conveners

Nuclear Clocks

• Ian Hill (National Physical Laboratory)

117. Towards laser excitation of the low-energy nuclear transition in 229Th

Dr Ekkehard Peik (PTB)

18/10/2023, 10:30

Molecular, Atomic, Ion and Nuclear Clocks

Invited Oral

We describe our experiments towards the resonant laser excitation of the 8.3 eV nuclear transition in 229Th with the motivation to develop a highly accurate nuclear optical clock for metrology and tests of fundamental physics.

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

Atsushi Yamaguchi

18/10/2023, 11:00

Molecular, Atomic, Ion and Nuclear Clocks

Invited Oral

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...