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Report No.

Measurement of the first ionization energy of nobelium (No, $$Z$$ = 102)

Sato, Tetsuya  ; Asai, Masato ; Kaneya, Yusuke; Tsukada, Kazuaki ; Toyoshima, Atsushi; Takeda, Shinsaku; Mitsukai, Akina*; Nagame, Yuichiro; Ichikawa, Shinichi; Makii, Hiroyuki  ; Osa, Akihiko ; Sakama, Minoru*; Oe, Kazuhiro*; Sato, Daisuke*; Sch$"a$del, M.; Kratz, J. V.; Stora, T.*

We successfully determined the first ionization energy (IE) of nobelium (No, $$Z$$ = 102) using a short-lived No isotope, $$^{257}$$No produced in the$$^{248}$$Cm($$^{13}$$C, 4n) reaction, based on the IE dependence of the ionization efficiency in a surface ionization process. The IE value of No was evaluated to be 6.6 eV. This value is in a good agreement with the value which has been estimated by an extrapolation from those of the lighter actinide elements, 6.65 eV.



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