EPJ Web of Conferences
Volume 17, 20115th International Conference FUSION11
|Number of page(s)||4|
|Section||Session 9 Chairperson Lacroix D.|
|Published online||19 October 2011|
Investigation of ﬁssion properties and evaporation residue measurement in the reactions using 238U target nucleus
Japan Atomic Energy Agency, Tokai,
2 GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
3 Institut für Kernphysik, Goethe-Universität Frankfurt, 60438 Frankfurt am Main, Germany
4 Department of Nuclear Physics and Biophysics, Comenius University, 84248 Bratislava, Slovakia
5 Flerov Laboratory of Nuclear Reactions, 141 980 Dubna, Russia
6 Higher Institute of Technologies and Applied Sciences, Habana 10400, Cuba
7 Institut für Radiochemie, Technische Universität München, 85748 Garching, Germany
8 Department of Physics, Tohoku University, Sendai 980-8597, Japan
9 Laboratory of Nuclear Science, Tohoku University, Sendai 982-0826, Japan
10 High Energy Accelerator Organization (KEK), Tsukuba 305-0801, Japan
Fragment mass distributions for ﬁssion after full momentum transfer were measured in the reactions of 30Si,34,36 S,31P,40Ar + 238U at bombarding energies around the Coulomb barrier. Mass distributions change signiﬁcantly as a function of incident beam energy. The asymmetric ﬁssion probability increases at sub-barrier energy. The phenomenon is interpreted as an enhanced quasiﬁssion probability owing to orientation effects on fusion and/or quasiﬁssion. The evaporation residue (ER) cross sections were measured in the reactions of 30Si + 238U and 34S + 238U to obtain information on fusion. In the latter reaction, signiﬁcant suppression of fusion was implied. This suggests that ﬁssion events different from compound nucleus are included in the masssymmetric fragments. The results are supported by a model calculation based on a dynamical calculation using Langevin equation, in which the mass distribution for fusion-ﬁssion and quasiﬁssion fragments are separately determined.
© Owned by the authors, published by EDP Sciences, 2011
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