- Effects of nuclear orientation on fusion and fission in the
reaction using 238U target nucleus (2010) - Fission fragment
mass distributions in the reaction of 30Si+238U were measured
around the Coulomb barrier. At the above-barrier energies, the
mass distribution showed a Gaussian shape. At the subbarrier
energies, triple-humped distribution was observed, which
consists of symmetric fission and asymmetric fission peaked at
AL/AH ~ 90/178. The asymmetric fission should be attributed to
quasifission from the results of the measured evaporation
residue (ER) cross-sections for 30Si+238U. The cross-section for
263Sg at the abovebarrier energy agree with the statistical
model calculation which assumes that the measured fission cross-
section originates from fusion-fission, whereas the one for 264
Sg measured at the sub-barrier energy is smaller than the
calculation, which suggests the presence of quasifission.