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physics.atom-ph2026

Defect assignment of the clock site in

Daniel A. Rehn, Harry W. T. Morgan, Harris E. Mason +6

The paper reexamines which crystal defect hosts the 229Th nucleus in CaF2, showing that an isolated Th4+ substituting for Ca2+ with two nearby fluoride interstitials best explains…

physics.atom-ph2025

Host-dependent frequency offsets in Th nuclear clockwork

U. C. Perera, H. W. T. Morgan, Eric R. Hudson +1

Recent advances in laser excitation of the low-energy nuclear isomer transition in Th have opened avenues for developing nuclear clocks, a novel quantum technology with exc…

physics.atom-ph2025

A cryogenic Paul trap for probing the nuclear isomeric excited state Th

Daniel Moritz, Kevin Scharl, Markus Wiesinger +16

While laser excitation of the nuclear isomeric transition in Th has been recently achieved for thorium atoms embedded in large-bandgap crystals, laser excitation and charac…

physics.atom-ph2025

Th Nuclear Spectroscopy in an Opaque Material: Laser-Based Conversion Electron Mössbauer Spectroscopy of ThO

Ricky Elwell, James E. S. Terhune, Christian Schneider +11

Here, we report the first demonstration of laser-induced conversion electron Mössbauer spectroscopy of the Th nuclear isomeric state, which provides the ability to probe t…

physics.atom-ph2025

Theory of internal conversion of the thorium-229 nuclear isomer in solid-state hosts

H. W. T. Morgan, H. B. Tran Tan, R. Elwell +3

Laser excitation of thorium-229 nuclei in doped wide bandgap crystals has been demonstrated recently, opening the possibility of developing ultrastable solid-state clocks and sensi…

physics.atom-ph2024

Photo-Induced Quenching of the 229Th Isomer in a Solid-State Host

J. E. S. Terhune, R. Elwell, H. B. Tran Tan +5

The population dynamics of the 229Th isomeric state is studied in a solid-state host under laser illumination. A photoquenching process is observed, where off-resonant vacuum-ultra…