[1] Univ Surrey, Ion Beam Ctr, Guildford GU2 7XH, Surrey, England
[2] Inst Tecnol & Nucl, P-2686953 Sacavem, Portugal
[3] Univ Lisbon, Ctr Fis Nucl, P-1649003 Lisbon, Portugal
[4] Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Heverlee, Belgium
[5] MFA Res Inst Tech Phys & Mat Sci, H-1525 Budapest, Hungary
[6] CNR, IMM Sez Bologna, I-40129 Bologna, Italy
[7] IAEA, A-1400 Vienna, Austria
[8] KFKI Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary
[9] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany
[10] Univ Helsinki, Accelerator Lab, Dept Phys, FIN-00014 Helsinki, Finland
[11] Cornell Univ, Dept MS&E, Ithaca, NY 14853 USA