Institution: | 1. Instituut voor Kern- en Stralingsfysika, K.U. Leuven, B-3030, Leuven, Belgium 2. Institut für Physik, Universit?t Mainz, D-6500, Mainz, FRG 3. Foster Radiation Laboratory, Mc Gill University, H3A2B2, Montreal, Canada 4. ISOLDE collaboration, CERN, CH-1211, Geneva 23, Switzerland
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