Institution: | 1. Hahn-Meitner-Institut Berlin, D-1000, Berlin 39, Germany 2. Fachbereich Physik, Freie Universit?t Berlin, D-1000, Berlin 33, Germany 3. Frachbereich Physik, Universit?t Marburg, Federal Republic of Germany 4. GSI, Darmstadt, Federal Republic of Germany
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