Eur. Phys. J. A 14, 147-157 (2002)
DOI: 10.1140/epja/i2001-10119-x
New results on elements 111 and 112
S. Hofmann1, F.P. Heßberger1, D. Ackermann1, G. Münzenberg1, S. Antalic2, P. Cagarda2, B. Kindler1, J. Kojouharova1, M. Leino3, B. Lommel1, R. Mann1, A.G. Popeko4, S. Reshitko1, S. Saro2, J. Uusitalo3 and A.V. Yeremin41 Gesellschaft für Schwerionenforschung (GSI), D-64220 Darmstadt, Germany
2 Department of Nuclear Physics, Comenius University, SK-84248 Bratislava, Slovakia
3 Department of Physics, University of Jyväskylä, FIN-40351 Jyväskylä, Finland
4 Flerov Laboratory of Nuclear Reactions, JINR, RU-141 980 Dubna, Russia
S.Hofmann@gsi.de
(Received: 21 December 2001 Communicated by D. Schwalm)
Abstract
This paper is dedicated to our former department leader P. Armbruster on the occasion of his 70th birthday - Experiments
on the synthesis and identification of the
nuclei
272111 and
277112 were performed in order to
confirm previous results. Three additional decay chains were
measured in the reaction
. The study revealed considerably improved data on the
decay chain originating from
272111. One additional chain was
measured in the reaction
. The decay properties of the chain starting at
277112 are in excellent agreement with the second chain of the
first experiment down to
265Sg, 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 of
269110 measured in 1994 and the first chain
of
277112 measured in 1996) the results of the new analysis
differed from the previous one. In all other cases the earlier data
are exactly reproduced.
23.60.+e - Alpha decay.
25.70.-z - Low and intermediate energy heavy-ion reactions.
25.85.Ca - Spontaneous fission.
27.90.+b -
.
© Società Italiana di Fisica, Springer-Verlag 2002
