Fusion-Fissions
and Quasi-fissions of 32,34S- and 48Ti-induced
Fissions
at Near-barrier Energies,
C.
J. Lin and H. Q. Zhang, China Institute of Atomic Energy, P.
O. Box 275(10),
Beijing 102413, China − The
fission fragments of 32S+184W and 34S+186W
systems have been measured by silicon-strips detectors at energies
around the
Coulomb barrier. The
angular
distributions of 32S+184W system and the
mass
distributions of 34S+186W system were
derived to show the
influence of reaction energies, target deformations, and shell
effects on the
fusion-fission processes. Moreover,
the
mass distributions of the fission fragments have been measured by
PPAC
detectors in reactions of 48Ti beams on 144,154Sm,
162Dy,
174Yb, 186W, 192Os, 196Pt,
200Hg,
and 208Pb targets at near-barrier energies. The systematic tendencies
of the mass widths
were investigated to display the effects of target deformations,
fissilities
and energies on the reaction processes. These
experimental studies supply a valuable clue to understand the
dynamical
processes of competitions between fusion-fission and
quasi-fission.