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Report No.

Measurement of the first ionization potential of Lr by surface ionization method

Sato, Tetsuya; Kaneya, Yusuke*; Sonoda, Nozomi; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Oe, Kazuhiro; Miyashita, Sunao; Nagame, Yuichiro; Sch$"a$del, M.; Ichikawa, Shinichi; Osa, Akihiko; Stora, T.*; Kratz, J. V.

In order to determine the first ionization potential (IP) of lawrencium (Lr, Z=103), we have developed a surface ionization type ion-source coupled to a He/CdI$$_2$$ gas-jet transport system for the JAEA-ISOL. We measured ionization efficiencies of $$^{256}$$Lr and various short-lived lanthanide isotopes by applying the ion-source. We successfully ionized and mass-separated for the first time $$^{256}$$Lr ions. From a correlation between the IPs and ionization efficiencies of the short-lived lanthanide isotopes, we estimated the IP of Lr in this work.



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