Impact of entrance-channel properties on the mechanism of reactions leading to the formation of ¹⁸⁰Hg

Abstract To study the impact of entrance-channel properties on the dynamics of reactions leading to the formation of the same 180 Hg composite system, the mass and energy distributions of binary fragments formed in the 36 Ar+ 144 Sm, 56 Fe+ 124 Xe, 68 Zn+ 112 Sn, and 90 Zr+ 90 Zr reactions were measured at energies close to and above the Coulomb barrier using the CORSET spectrometer. The comparative analysis of the reactions under study was performed at similar excitation energies and mean angular momenta. For the 56 Fe-, 68 Zn- and 90 Zr-induced reactions a large contribution of quasifission process (more than 40%, 70% and 80% of all fissionlike fragments) was observed. It was found that the shape of the quasifission fragments mass distributions depends on the reaction entrance channel properties, and the fragments are formed in the vicinity of the closed neutron and/or proton shells nearest to the neutron and proton numbers of interacting nuclei.