Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 19: Precision spectroscopy of atoms and ions II (joint session A/Q)
A 19.4: Talk
Wednesday, March 16, 2022, 14:45–15:00, A-H2
Resonance ionization mass spectroscopy on Americium — •Matou Stemmler1, Felix Weber1, Christoph Düllmann2,3,4, 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 t1/2=432.2 y and t1/2=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.