Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 44: Precision Spectrosocopy VII (nuclear systems) (joint session A/Q)
A 44.4: Vortrag
Freitag, 9. März 2018, 11:15–11:30, K 1.016
Hyperfine structure and isomeric shifts in 229Th2+ — •Robert A. Müller1,2, Andrey V. Volotka3, Stephan Fritzsche2,4, and Andrey Surzhykov1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Technische Universität Braunschweig, Germany — 3Helmholtz-Institute Jena, Germany — 4Friedrich-Schiller-Universität Jena, Germany
In the past decade systems that are sensitive to possible time variations of α attracted much interest [1]. Besides the comparison of two atomic clocks, nuclear transitions could be used for the search of such variations. The isotope 229Th is a particularly suitable candidate, because of its low lying isomeric state 229mTh which is accessible to optical lasers. The sensitivity of the 229Th→229mTh transition to variations of α has been only estimated so far [2]. For a more accurate determination of this sensitivity and for the analysis of related experiments precise knowledge about the nuclear moments, as well as the isomeric shift of electronic levels is needed. In this contribution we will, therefore, discuss highly accurate calculations for the hyperfine structure of the 229Th2+ ion. We used these results to precisely determine the nuclear moments of the nuclear isomer 229mTh. Moreover we calculated the isomeric shift of electronic levels in Th2+. All calculations have been performed using the multi-configurational Dirac-Fock method as well as a combination of configuration interaction and many-body perturbation theory.
[1] J. K. Webb et al., Phys. Rev. Lett. 87, 091301 (2001)
[2] V. V. Flambaum, Phys. Rev. Lett. 97, 092502 (2006)