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Phys. Rev. Lett. 101, 212502 (2008) [4 pages]

Precision Measurement of the Hyperfine Structure of Laser-Cooled Radioactive 7Be+ Ions Produced by Projectile Fragmentation

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K. Okada1, M. Wada2,3,*, T. Nakamura2, A. Takamine2, V. Lioubimov2,8, P. Schury2, Y. Ishida2, T. Sonoda2, M. Ogawa4, Y. Yamazaki2,4, Y. Kanai2, T. M. Kojima2, A. Yoshida3, T. Kubo3, I. Katayama5, S. Ohtani6, H. Wollnik7, and H. A. Schuessler8
1Department of Physics, Sophia University, 7-1 Kioicho, Chiyoda, Tokyo 102-8554, Japan
2Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
3Nishina Center for Accelerator Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
4Graduate School of Arts and Science, The University of Tokyo, Meguro, Tokyo 153-8902, Japan
5Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
6Institute for Laser Science (ILS), University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan
7II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
8Department of Physics, Texas A&M University, College Station, Texas 77843, USA

Received 20 June 2008; published 18 November 2008

See accompanying Physics Synopsis

The ground state hyperfine splitting of 7Be+ 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 ≈1  GeV were thermalized in a rf ion guide gas cell and subsequently laser cooled in the ion trap to ≈1  μeV. This 1015-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 μI=-1.399 28(2)μN was deduced.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.212502
DOI:
10.1103/PhysRevLett.101.212502
PACS:
21.10.Ky, 27.20.+n, 31.30.Gs, 37.10.Ty

*mw@riken.jp

 
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