title: Precision measurement of the hyperfine structure of laser-cooled radioactive 7Be+ ions produced by projectile fragmentation.
abstract: The ground state hyperfine splitting of (7)Be+ has been measured by laser-microwave double-resonance spectroscopy in the online rf trap of RIKEN's slow RI-beam facility. Be ions produced by projectile fragmentation of 13C at approximately 1 GeV were thermalized in a rf ion guide gas cell and subsequently laser cooled in the ion trap to approximately 1 microeV. This 10(15)-fold reduction of the kinetic energy allows precision spectroscopy of these ions. A magnetic hfs constant of A=-742.772 28(43) MHz was measured for 7Be+, from which a nuclear magnetic moment of mu(I)=-1.399 28(2)mu(N) was deduced.
authors.affiliation: Department of Physics, Sophia University, 7-1 Kioicho, Chiyoda, Tokyo 102-8554, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okada
authors.forename: M
authors.initials: M
authors.lastname: Wada
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authors.lastname: Nakamura
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authors.initials: A
authors.lastname: Takamine
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authors.lastname: Lioubimov
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authors.lastname: Schury
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authors.lastname: Ishida
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authors.lastname: Sonoda
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authors.initials: M
authors.lastname: Ogawa
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authors.lastname: Yamazaki
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authors.initials: Y
authors.lastname: Kanai
authors.forename: T M
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authors.lastname: Kojima
authors.forename: A
authors.initials: A
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Kubo
authors.forename: I
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authors.lastname: Katayama
authors.forename: S
authors.initials: S
authors.lastname: Ohtani
authors.forename: H
authors.initials: H
authors.lastname: Wollnik
authors.forename: H A
authors.initials: HA
authors.lastname: Schuessler