Evidence of quasifission in the 180Hg composite system formed in the 68Zn + 112Sn reaction

For the 68Zn + 112Sn reaction Coulomb parameter Z1Z2 is equal to 1500 that close threshold value for appearance of quasifission process. It was found mass-energy distributions fragments differ significantly from those obtained in 36Ar 144Sm leading formation same composite system 180Hg at similar excitation energies about 50 MeV. In case with ions, mass distribution fissionlike has a wide two-humped shape maximum yields 70 and 110 u light heavy fragments, respectively, instead 80 100 observed fission formed reaction. The difference explained by an unexpectedly large contribution (more than 70%)