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Phys Rev Lett. 2008 Nov 21;101(21):212502. doi: 10.1103/PhysRevLett.101.212502. Epub 2008 Nov 18.

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

Physical review letters

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

Affiliations

  1. Department of Physics, Sophia University, 7-1 Kioicho, Chiyoda, Tokyo 102-8554, Japan.

PMID: 19113405 DOI: 10.1103/PhysRevLett.101.212502

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.

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