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Report No.

The First ionization potential measurement of lawrencium (Lr, $$Z$$ = 103)

Sato, Tetsuya  ; Asai, Masato ; Kaneya, Yusuke; Tsukada, Kazuaki ; Toyoshima, Atsushi; Miyashita, Sunao*; Oe, Kazuhiro*; Osa, Akihiko ; Ichikawa, Shinichi; Nagame, Yuichiro; Sch$"a$del, M.; Renisch, D.*; Stora, T.*; Borchevsky, A.*; D$"u$llmann, Ch. E.*; Kratz, J. V.; Eberhardt, K.*; Th$"o$rle-Pospiech, P.*; Runke, J.*; Trautmann, N.*

The first ionization potentials of the heaviest actinide elements have not been measured until today owing to short half-lives and low production rates of the isotopes. Based on the surface ionization technique, we performed a measurement of the ionization potential of the heaviest actinide element, lawrencium (Lr, $$Z$$ = 103), by using a newly developed surface ion-source installed to the JAEA-ISOL (Isotope Separator On-Line) at the JAEA tandem accelerator facility. We report on an evaluation of the IP value of Lr based on comparison of ionization behavior of $$^{256}$$Lr with that of short-lived lanthanide isotopes on Ta surface at several temperature.



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