Dresden 2011 – wissenschaftliches Programm
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MS: Fachverband Massenspektrometrie
MS 7: Resonance Ionization MS, REMPI, MALDI
MS 7.5: Vortrag
Mittwoch, 16. März 2011, 17:15–17:30, GÖR 229
Measurement of the hyperfine structure of 229gTh — •Volker Sonnenschein1, Sebastian Raeder2, Tina Gottwald2, Iain Moore1, Sebastian Rothe3, and Klaus Wendt2 — 1Department of Physics, FI-40014 University of Jyväskylä, Finland — 2Institut für Physik, Johannes Gutenberg-Universität, D - 55099 Mainz — 3CERN, Geneva, Switzerland
In preparation for an identification of the low-lying 7.6eV isomer 229mTh, I=3/2+, through its respective hyperfine structure (HFS), the HFS of the ground state nucleus 229gTh, I=5/2+, was measured using Resonance Ionization Spectroscopy.
Three transitions originating from the atomic ground state were probed with the help of a frequency doubled (tripled) narrow bandwidth (20 MHz) injection-seeded Ti:sapphire laser. Subsequent excitation into autoionizing states with broadband (5+ GHz) Ti:sapphire lasers was used for ionization. Though the HFS was not fully resolved in the resulting spectra of each transition, the combination of the data was used to give first estimates for the atomic ground state hyperfine coupling constants A0 and B0.
Preparations for further experiments related to the isomer search are in progress at the IGISOL facilty in Finland. These experiments will likely use an off-line ion-guide based quadrupole mass spectrometer setup with a 233U recoil ion guide for 229g,mTh production. Alternatively the collinear laser spectroscopy beam line will be available at the newly constructed IGISOL-4 site.