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Surface-ionization of lanthanides for the measurement of the first ionization potential of Lr

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

The first ionization potential (IP) of the last actinide, lawrencium (Lr), is predicted to be lower than those of other actinides. To determine the IP of Lr based on the surface ionization comparison technique, we are developing a surface-ionization-type ion-source coupled to a gas-jet transport system at the Isotope Separator On-Line at the JAEA tandem accelerator facility. In the present study, we measured ionization efficiencies of lanthanides as a function of ion-source temperature to examine the applicability of our apparatus to the IP measurement. It was found that the obtained ionization efficiency of each lanthanide element is affected by an ionization potential as well as a boiling point.

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