Affiliation: | 1. Institute of Experimental Physics, Warsaw University, PL-00-681, Warsaw, Poland 2. GSI Darmstadt, Postfach 541, D-6100, Darmstadt, Federal Republic of Germany 3. Institut für Kernchemie, Universit?t Mainz, D-6500, Mainz, Federal Republic of Germany 4. II. Physikalisches Institut, Universit?t G?ttingen, D-3400, G?ttingen, Federal Republic of Germany
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