1. Instituto de Pesquisas Energéticas e Nucleares, University of São Paulo, 05508-000 São Paulo, Brazil
2. Faculdade de Ciências Exatas e Tecnologia, Universidade Federal do Pará, 68440-000 Abaetetuba, PA, Brazil
3. Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 45141 Essen, Germany
4. European Organization for Nuclear Research (CERN), CH-1211 Geneva, Switzerland