Affiliation: | 1. Physics Department, Stockholm University, AlbaNova University Center, 10691, Stockholm, Sweden 2. Division of Ion Physics, ?ngstr?m Laboratory, Uppsala University, Box 534, 75121, Uppsala, Sweden 3. Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, 305-0006, Japan 4. Department of Physics and Astronomy, University of Aarhus, 8000, Aarhus C, Denmark 5. CIRIL/GANIL, rue Claude Bloch, B.P. 5133, 14070, Caen Cedex 05, France
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