A few days ago, a new manuscript was submitted to the arXiv preprint server. It discusses a new approach to measure (or at least contrain) the Th-229 isomer energy by optically exciting Th+ or Th2+ ions into metastable electronic states, and seeking to observe internal conversion from the excited electronic state to the nucleus. Laser excitation into a suitable metastable state seems to be an intricate process, involving 4 or even 6 resonant lasers. This publication is a joint work by the MPIK Heidelberg, Jyväskylä, and TU Vienna groups, and can be found here.
https://www.nuclock.eu/wp-content/uploads/2015/10/Post_team2.jpg 200 499 Simon Stellmer https://www.nuclock.eu/wp-content/uploads/2015/07/nuclock-color-300x77.png Simon Stellmer2017-01-02 18:45:362017-01-02 18:46:41New preprint publication