Fusion dynamics of symmetric systems near barrier energies

Abstract

The enhancement of the sub-barrier fusion cross sections was explained as the lowering of the dynamical fusion barriers within the framework of the improved isospin-dependent quantum molecular dynamics (ImIQMD) model. The numbers of nucleon transfer in the neck region are appreciably dependent on the incident energies, but strongly on the reaction systems. A comparison of the neck dynamics is performed for the symmetric reactions ${}^{58}$Ni+${}^{58}$Ni and ${}^{64}$Ni+${}^{64}$Ni at energies in the vicinity of the Coulomb barrier. An increase of the ratios of neutron to proton in the neck region at initial collision stage is observed and obvious for neutron-rich systems, which can reduce the interaction potential of two colliding nuclei. The distribution of the dynamical fusion barriers and the fusion excitation functions are calculated and compared them with the available experimental data.

arXiv comment9 pages, 5 figures

References in corpus (7)

• A program for coupled-channels calculations with all order couplings for heavy-ion fusion reactions
• Quantum Tunneling in Nuclear Fusion
• Influence of nuclear structure on sub-barrier hindrance in Ni+Ni fusion
• Energy dependence of nucleus-nucleus potential close to the Coulomb barrier
• Formation of superheavy nuclei in cold fusion reactions
• Production of heavy and superheavy nuclei in massive fusion reactions
• Dynamical analysis on heavy-ion fusion reactions near Coulomb barrier

Cited by in corpus (13)

• Probing high-density behavior of symmetry energy from pion emission in heavy-ion collisions
• Momentum dependence of the symmetry potential and its influence on nuclear reactions
• Nuclear in-medium effects and collective flows in heavy-ion collisions at intermediate energies
• Effective mass splitting of neutron and proton and isospin emission in heavy-ion collisions
• Probing the density dependence of symmetry energy via multifragmentation at sub-saturation densities
• Dynamics of strangeness and collective flows in heavy-ion collisions near threshold energies
• Constraining the high-density behavior of nuclear equation of state from strangeness production in heavy-ion collisions
• Dynamics of pion production in heavy-ion collisions around 1A GeV energies
• Nuclear in-medium and isospin effects on subthreshold kaon production in heavy-ion collisions
• Selection of projectiles for producing trans-uranium nuclei in transfer reactions within an improved dinuclear system model
• Dynamics of strangeness production in heavy-ion collisions near threshold energies
• Determination of the nucleon-nucleon interaction in the ImQMD model by nuclear reaction at the Fermi energy region
• Probing the sensitivity of the total nucleus-nucleus reaction cross section at intermediate energies to medium effects and isospin asymmetries