1. Adelphi Technology, Inc., 2003 East Bayshore Road, Redwood City, California 94063-4121, USA
2. Physics Department, Technical University Munich, Boltzmannstr. 2, 85748 Garching, Germany
3. Faculty of Physics, University of Vienna, Boltzmanng. 5, 1090 Vienna, Austria
4. Nuclear and Particle Physics Group, Institut Laue Langevin, 71 Avenue des Martyrs, CS 20156, F-38042 Grenoble Cedex 9, France
5. Institut Laue-Langevin, B.P. 156, 38042 Grenoble Cedex 9, France
6. Institute for Integrated Radiation and Nuclear Science Kyoto University, Kumatori, Osaka 590-0494, Japan
7. Department of Electrical Engineering, Stanford University, 350 Serra Mall, Stanford, California 94305, USA