Affiliation: | a National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824-1321, USA b Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1321, USA c Département de Physique, Université Paris Sud, F-91403 Orsay, France d PHELMA, Institut polytechnique de Grenoble, 38016 Grenoble, France e Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA |