N. Majumdar et al., ANOMALOUS PEAKLIKE STRUCTURE IN THE FISSION FRAGMENT ANISOTROPIES AT SUBBARRIER ENERGIES IN B-11, C-12, O-16, F-19-232 REACTIONS(TH), Physical review letters, 77(25), 1996, pp. 5027-5030
Fission fragment angular distributions have been measured for fission
following full momentum transfer in B-11, C-12, O-16, and F-19 + Th-23
2 systems from above barrier to below sub-barrier energies. The fragme
nt anisotropies [W(0 degrees)/W(90 degrees)] are found to exhibit an a
nomalous peaklike structure below the fusion barrier in all the system
s. This structure has a universal behavior independent of the entrance
channel mass asymmetry. With some refinement in the quasifission hypo
thesis it is possible to explain qualitatively the experimental result
s reasonably well.