Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Precision spectroscopy of atoms and ions II (joint session A/Q)

Q 39.4: Vortrag

Mittwoch, 16. März 2022, 14:45–15:00, A-H2

Resonance ionization mass spectroscopy on Americium — •Matou Stemmler¹, Felix Weber¹, Christoph Düllmann^2,3,4, Dominik Studer¹, Anjali Ajayakumar⁵, and Klaus Wendt¹ — ¹Institut of Physics, Johannes Gutenberg-Universität Mainz, Germany — ²Department of Chemistry - TRIGA site, Johannes Gutenberg-Universität, Germany — ³Helmholtz Institut Mainz, Germany — ⁴GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt, Germany — ⁵GANIL, France

Americium (Am, Z=95) is a transuranic member of the actinide series which can be produced artificially by neutron bombardment in nuclear reactors or explosions. All its isotopes are radioactive and the two most long-lived isotopes are ²⁴¹Am and ²⁴³Am with half-lifes of t_1/2=432.2 y and t_1/2=7370 y respectively. Here we report on high resolution laser spectroscopy on Am. About 3·10¹³ atoms of both isotopes ²⁴¹Am and ²⁴³Am were prepared on zirconium foil and loaded into a resistively heated tantalum oven. A wide range tuneable, frequency doubled, continuous wave Titan:Sapphire laser was used for spectroscopy by injection locking of a high power pulsed Ti:Sa ring laser setup. Hyperfine structures of the two isotopes were investigated in two different ground state transitions, which served as first excitation steps for resonant ionisation via suitable autoionizing states. In addition, the isotope shift was determined in one of these transitions. Data analysis regarding the atomic structure of Am as well as hyperfine parameters extracted will be discussed.