[1] Inst. F. Hochenergiephysik O., A-1050, Vienna, Austria
[2] MPI für Kernphysik, D-69029, Heidelberg, Germany
[3] GSI, Darmstadt, Germany
[4] LETI (CEA-Technol. Avancees) DEIN/S., 91191 Gif-Sur-Yvette, France
[5] LENS, Florence, Italy
[6] University of Florence, Florence, Italy
[7] LEPSI, IN2P3/CNRS-ULP, 67037, Strasbourg, France
[8] Rutgers University, Piscataway, NJ 08855, United States
[9] CERN, CH-1211, 23, Geneva, Switzerland
[10] CPPM, Marseille 13288, France
[11] LEPES, Grenoble, France
[12] NIKHEF, Amsterdam, Netherlands
[13] Ohio State University, Columbus, OH 43210, United States
[14] Bristol University, BS8 1TL, Bristol, United Kingdom
[15] II.Inst. für Exp. Physik, Hamburg, Germany
[16] Universita di Pavia, Dipartimento di Elettronica, 27100, Pavia, Italy
[17] FNAL, Batavia, IA, United States
[18] Lab. für Hochenergiephysik, 3012 Bern, Switzerland
[19] University of Toronto, Toronto, Ont. M5S 1A7, Canada
[20] Los Alamos National Laboratory, Los Alamos, NM 87545, United States