R. E. Azuma^*, L. C. Carraz, P. G. Hansen^†, B. Jonson^‡, K. -L. Kratz^§, S. Mattsson^‡, G. Nyman^∥, H. Ohm^§, H. L. Ravn, A. Schröder^§, and W. Ziegert^§

• The ISOLDE Collaboration, CERN, Geneva, Switzerland

• ^*On sabbatical leave from Department of Physics, University of Toronto, Toronto, Ontario, Canada.
• ^†Permanent address: Institute of Physics, University of Aarhus, Aarhus, Denmark.
• ^‡On leave from Department of Physics, Chalmers University of Technology, Göteborg, Sweden.
• ^§Permanent address: Institut für Kernchemie, Universität Mainz, Mainz, Federal Republic of Germany.
• ^∥Permanent address: Department of Physics, Chalmers University of Technology, Göteborg, Sweden.