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Development of a surface ionizer coupled to a gas-jet transport system for the measurement of the first ionization potential of Lr

Sato, Nozomi; Asai, Masato  ; Tsukada, Kazuaki  ; Sato, Tetsuya   ; Toyoshima, Atsushi; Li, Z.; Kikuchi, Takahiro; Kaneya, Yusuke*; Ichikawa, Shinichi; Nagame, Yuichiro ; Sch$"a$del, M.

It is important to determine the first ionization potentials (IPs) of the heaviest elements with atomic number Z $$>$$ 100 to understand their valence electronic structure affected by relativistic effects. Due to low production rates and short half-lives of the heaviest nuclides, IPs of these elements have not been so far determined. We are developing a surface-ionization-type ion source coupled to a gas-jet transport system in the Isotope Separator On-Line (ISOL) at the JAEA tandem accelerator facility to measure the IP of the heaviest actinide, lawrencium (Lr, Z = 103). In the symposium, we report the present status of the development of the apparatus. Production yield measurements of $$^{256}$$Lr (half-life 27 s), that is suitable for this study, will be also presented.

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