Measurement of the first ionization potentials of short-lived lanthanides using a surface ionization method

表面電離法を用いた短寿命ランタノイド核種の第一イオン化エネルギーの測定

金谷 佑亮; 佐藤 哲也   ; 浅井 雅人  ; 塚田 和明  ; 豊嶋 厚史; 永目 諭一郎 ; Schdel, M.; 佐藤 望; 大江 一弘*; 宮下 直*; 長 明彦  ; 市川 進一; Stora, T.*; Kratz, J. V.*

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

We measured ionization efficiencies of various short-lived lanthanides and evaluated their first ionization potentials (IP), as a test experiment for measurement of IP of heavy actinides. Short-lived lanthanides, Eu, Sm, Tb, Ho, Er, and Yb, were produced by the irradiation of a 67.9-MeV B beam delivered from the JAEA tandem accelerator on Ce / Pr / Tb and Nd / Sm / Eu targets. Short-lived Lu was also produced in the reaction of Dy with a B beam. First ionization potentials of these nuclides are evaluated based on the Saha-Langmuir equation and will be presented in the Conference.