1. European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland
2. Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
3. Instituto de Pesquisas Energéticas e Nucleares, Universidade de São Paulo, 05508-000 São Paulo, Brazil
4. Escola Politécnica, Universidade de São Paulo, 05508-010 São Paulo, Brazil
5. Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany