Precision measurement of the hyperfine structure of laser-cooled radioactive 7Be+ ions produced by projectile fragmentation. Academic Article uri icon


  • 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.

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Okada, K., Wada, M., Nakamura, T., Takamine, A., Lioubimov, V., Schury, P., ... Schuessler, H. A.

citation count

  • 41

complete list of authors

  • Okada, K||Wada, M||Nakamura, T||Takamine, A||Lioubimov, V||Schury, P||Ishida, Y||Sonoda, T||Ogawa, M||Yamazaki, Y||Kanai, Y||Kojima, TM||Yoshida, A||Kubo, T||Katayama, I||Ohtani, S||Wollnik, H||Schuessler, HA

publication date

  • November 2008