Evidence of quasifission in the 180Hg composite system formed in the 68Zn + 112Sn reaction © 2021 The Authors. Published by Elsevier B.V. Published version Kozulin, E.M.; Vardaci, E.; Trzaska, W.H.; Bogachev, A.A.; Itkis, I.M.; Karpov, A.V.; Knyazheva, G.N.; Novikov, K.V. For the 68 Zn + 112 Sn reaction the Coulomb parameter Z 1 Z 2 is equal to 1500 that is close to the threshold value for the appearance of quasifission process. It was found that mass-energy distributions of the reaction

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... ts differ significantly from those obtained in the 36 Ar + 144 Sm reaction leading to the formation of the same composite system of 180 Hg at similar excitation energies of about 50 MeV. In the case of the reaction with 68 Zn ions, the mass distribution of fissionlike fragments has a wide twohumped shape with maximum yields at 70 and 110 u for the light and heavy fragments, respectively, instead of 80 and 100 u observed in the fission of 180 Hg formed in the 36 Ar + 144 Sm reaction. The difference is explained by an unexpectedly large contribution (more than 70%) of quasifission in the case of the 68 Zn + 112 Sn reaction.