Institution: | 1. Department of Physics and Astronomy, University of Basel, Ch-4056, Basel, Switzerland 2. Institut für Kernphysik, Johannes-Gutenberg-Universit?t Mainz, D-55099, Mainz, Germany 3. Department of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK 4. II. Physikalisches Institut, Universit?t Giessen, D-35392, Giessen, Germany
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