Experiments on the synthesis and identification of the nuclei²⁷²111 and²⁷⁷112 were performed in order to confirm previous results. Three additional decay chains were measured in the reaction⁶⁴Ni +²⁰⁹Bi →²⁷³111^*. The study revealed considerably improved data on the decay chain originating from²⁷²111. One additional chain was measured in the reaction⁷⁰Zn +²⁰⁸Pb →²⁷⁸112^*. The decay properties of the chain starting at²⁷⁷112 are in excellent agreement with the second chain of the first experiment down to²⁶⁵Sg, where the new chain ends by a previously unknown spontaneous-fission branch. A re-analysis of all the data on elements 110, 111, and 112 measured at GSI since 1994 (a total of 34 decay chains was investigated) revealed that for 2 chains (the second chain of²⁶⁹110 measured in 1994 and the first chain of²⁷⁷112 measured in 1996) the results of the new analysis differed from the previous one. In all other cases the earlier data are exactly reproduced.

Authors and Affiliations

1. Gesellschaft für Schwerionenforschung (GSI), D-64220 Darmstadt, Germany, , , , , , DE

   S. Hofmann, F.P. Heßberger, D. Ackermann, G. Münzenberg, B. Kindler, J. Kojouharova, B. Lommel, R. Mann & S. Reshitko

2. Department of Nuclear Physics, Comenius University, SK-84248 Bratislava, Slovakia, , , , , , SK

   S. Antalic, P. Cagarda & S. Śaro

3. Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland, , , , , , FI

   M. Leino & J. Uusitalo

4. Flerov Laboratory of Nuclear Reactions, JINR, RU-141 980 Dubna, Russia, , , , , , RU

   A.G. Popeko & A.V. Yeremin

Received: 21 December 2001 / Accepted: 15 January 2002

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