1. Université Paris-Sud, 91405 Orsay cedex, France
2. CNRS, IPN Orsay, F-91406 Orsay, France
3. CEA, DAM, DIF, F-91297 Arpajon, France
4. CNRS, CENBG, F-33175 Gradignan, France
5. Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
6. Universidade de Vigo, E-36310 Vigo, Spain
7. Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
8. GSI, Gesellschaft fur Schwerionenforschung GmbH, Planckstr. 1, D-64291 Darmstadt, Germany