1. Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, New Mexico
2. Gesellschaft für Schwerionenforschung (GSI), D-64220 Darmstadt, Germany
3. Institute for Theoretical Physics, P.O. Box 9, FIN-00014, University of Helsinki, Helsinki, Finland
4. Nuclear Science Division, MS 70A-3307 Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720, California