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4th International Conference on Physics

Berlin, Germany

Yuichiro Nagame

Japan Atomic Energy Agency, Japan

Title: Determination of the first ionization potentials of heavy actnides based on an atom at a time scale


Biography: Yuichiro Nagame


The first ionization potential (IP1) is one of the most sensitive atomic properties which reflect the outermost electron
configuration. Precise and accurate determination of IP1 of heavy elements allows us to give significant information on
valence electronic structure affected by relativistic effects. The IP1 values of heavy elements up to einsteinium (Es, Z=99),
produced in a nuclear reactor in macroscopic quantities were successfully measured by resonance ionization mass spectroscopy.
IP1 values of heavy elements with Z≥100, however, have not been determined experimentally, because both half lives and
production rates of nuclides of still heavier elements are rapidly decreasing, which forces us to manage elements on an atomat-
a-time scale. In the present study, we report the determination of the IP1 values of heavy actinides from fermium (Fm,
Z=100) through lawrencium (Lr, Z=103) using a surface ionization technique. The surface ion-source installed in JAEA-ISOL
(isotope separator on-line) was applied for measuring the ionization of the short-lived nuclides 249Fm (half-life T1/2=2.6 min),
251Md (T1/2=4.27 min), 257No (T1/2=24.5 s), and 256Lr (T1/2=27 s) that were produced in the 243Am + 11B, 243Am + 12C, 248Cm + 13C,
and 249Cf + 11B reactions, respectively, at the JAEA tandem accelerator. The number of ions collected after the mass-separation
was determined by α-particle spectroscopy to evaluate ionization efficiencies. The obtained IP1 values are in good agreement
with those predicted by state of the art relativistic calculations as well as with early prediction. The contribution will present
experimental details and results obtained in this study.