Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 44: Precision Spectrosocopy VII (nuclear systems) (joint session A/Q)

A 44.5: Vortrag

Freitag, 9. März 2018, 11:30–11:45, K 1.016

Towards coherent control of the ²²⁹Th isomeric transition in VUV-transparent crystals — •Brenden Nickerson and Adriana Pálffy — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Current efforts in the development of a nuclear frequency standard based on the isomeric state of ^229mTh at approx. 7.8 eV have been centered around precisely determining its energy. The unique lowest transition in the ²²⁹Th nucleus with frequency in the vacuum ultraviolet (VUV) range and very narrow linewidth promises enhanced precision and amazing stability [1]. A very exact measurement of the isomeric transition energy has been elusive, with the first confirmation of the level decay coming only recently [2].

Here, we investigate collective effects that may allow for coherent control of the isomeric transition in ²²⁹Th:CaF₂ VUV-transparent crystals. The collectively enhancement scattering in forward direction is considered [3]. Starting from this setup, we investigate the effect of pulsed lasers, coincident pulses, different pulse phases and of magnetic fields for the intensity spectrum. By taking advantage of such effects we aim to design a more sensitive nuclear excitation scheme to resolve not only the transition energy but provide a clear signature of the excitation.

[1] W. G. Rellergert et al., Phys. Rev. Lett. 104, 200802 (2010).

[2] L. von der Wense et al., Nature 533, 47-51 (2016).

[3] W.-T. Liao et al., Phys. Rev. Lett. 109, 262502 (2012).