Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 65: Precision spectroscopy of atoms and ions III (with A)
Q 65.1: Vortrag
Freitag, 4. März 2016, 11:00–11:15, f428
Spectroscopy of hyperfine structures and isotope shifts in the sequence of 97-99 technetium — •Tobias Kron1, Reinhard Heinke1, Sebastian Raeder2, Tobias Reich3, Pascal Schönberg3, and Klaus Wendt1 — 1Institute of Physics, Mainz University — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 3Institute of Nuclear Chemistry, Mainz University
One of the dominant fission products of uranium is technetium-99, which is generally extremely rare in nature, due to the fact that all isotopes are unstable. With a long half-life and its strong β−-radioactivity, 99Tc is one of the major radiotoxic long-term remnants of nuclear reactors and atomic bombs. On the other hand, knowledge on atomic and nuclear properties of technetium isotopes is rather scarce due to their rare occurrence. Both, ultra-trace determination as well as investigations of nuclear structure are of relevance and require extensive atomic spectroscopy as input.
This talk presents first results of high resolution resonance ionization spectroscopy on the isotopes 97−99Tc. Measurements were carried out on smallest samples in the order of 1012 atoms or less, using a high repetition rate laser system. The hyperfine structures and isotope shifts of several transitions were investigated, giving new information on nuclear structure and deriving the so-far unclear nuclear spin of 98Tc. Experimental linewidths around 100 MHz were achieved by using a frequency-doubled pulsed injection-locked titanium:sapphire laser in combination with a newly developed ion source with a perpendicular laser-atom beam geometry in a radiofrequency quadrupole structure.