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

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, and H. A. Schuessler
Phys. Rev. Lett. 101, 212502 – Published 18 November 2008
Physics logo See Synopsis: How do you trap a very high-energy ion?

Abstract

The ground state hyperfine splitting of Be+7 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 C13 at 1GeV were thermalized in a rf ion guide gas cell and subsequently laser cooled in the ion trap to 1μeV. This 1015-fold reduction of the kinetic energy allows precision spectroscopy of these ions. A magnetic hfs constant of A=742.77228(43)MHz was measured for Be+7, from which a nuclear magnetic moment of μI=1.39928(2)μN was deduced.

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  • Received 20 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.212502

©2008 American Physical Society

Synopsis

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How do you trap a very high-energy ion?

Published 15 December 2008

The report of a successful experiment at the new radioactive ion trap at RIKEN paves the way for future measurements of more exotic nuclei, and tests some of the key methods needed to build future rare-isotope accelerators.

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Authors & Affiliations

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

  • *mw@riken.jp

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Issue

Vol. 101, Iss. 21 — 21 November 2008

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