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Report No.
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Observation of doubly-charged ions of francium isotopes extracted from a gas cell

Schury, P.*; Wada, Michiharu*; Ito, Yuta*; Kaji, Daiya*; Haba, Hiromitsu*; Hirayama, Yoshikazu*; Kimura, Sota*; Koura, Hiroyuki  ; MacCormick, M.*; Miyatake, Hiroari*; Moon, J. Y.*; Morimoto, Koji*; Morita, Kosuke*; Murray, I.*; Osawa, Akira*; Rosenbusch, M.*; Reponen, M.*; Takamine, Aiko*; Tanaka, Taiki*; Watanabe, Yutaka*; Wollnik, H.*

Various isotopes of Ac, Ra, Fr, and Rn were produced by fusion-evaporation reactions using a $$^{48}$$Ca beam. The energetic ions were stopped in and extracted from a helium gas cell. The extracted ions were identified using a multi-reflection time-of-fight mass spectrograph. In all cases, it was observed that the predominant charge state for the extracted ions, including the alkali Fr, was 2+.

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