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+.

Language	:	English
Journal	:	Nuclear Instruments and Methods in Physics Research B
Volume	:	407
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Pages	:	p.160 - 165
Publication Year/Month	:	2017/06
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Paper URL	:	https://doi.org/10.1016/j.nimb.2017.06.014
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Keywords	:	no keyword
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Registration No. : AA20170162
JAEA Abstracts No. : 45000892
Paper Submission No. : 19136

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