Thorium research worldwide

The eight research groups within the nuClock consortium are certainly not the only ones that push for an investigation of the isomeric state. Below, you find a list of research groups that are currently active in the field.

If your group is not listed, but you would like your website and email address to appear here, please send me a note. Conversely, if you would like your group to be removed from the list, please tell me as well.


  • INRIM (director: Massimo Inguscio); started Th-229 research in 2015.
  • Institute of Physics of the National Academy of Sciences, Kiev, Ukraine (L. Yatsenko and others); theory.
  • U of St. Petersburg (S. G. Porsev and others); theory.
  • U of Moscow (E.V. Tkalya and others); theory on Th-229, especially coupling to electronic states.
  • MEPhI (Moscow); ion traps, started Th-229 research in 2015. MEPhI webpage
  • KU Leuven (Belgium); nuclear spectroscopy in the group of Piet van Duppen, just started Th-229 research in 2017. Group webpage

The Americas

  • UCLA (group leader: Eric Hudson); spectroscopy of Th-229 doped into LiSrAlF6 crystals. Group webpage.
  • U of Michigan (group leader: Alex Kuzmich); Paul trap with Th3+. Group webpage
  • Los Alamos (group leader: David Vieira); detection of VUV photons emitted after U-233 decay.
  • NIST; theory on Th-229 (Kyle Beloy), various optical clocks (Dave Wineland and Chris Oates groups).


  • Okayama University (group leader: Koji Yoshimura) and various other institutes in Japan; population of the isomer via the 29-keV state using SPring-8 synchrotron radiation. Group webpage.


  • UNSW Sydney; V.V. Flambaum: theory on various fundamental problems in physics, among them the measurement of drifts in fundamental constants
  • Griffith University & CSIRO, Brisbane; Marcin Piotrowski and Stephen Gensemer, working on Th ion traps