Abstract
Fragment mass distributions for fission after full momentum transfer were measured in the reactions of 30Si,34,36S,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 the fusion probability. In the latter reaction, significant suppression of fusion was implied. This suggests that quasifission has large fraction in the mass-symmetric fission events. 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.
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