Microscopic dynamics simulations of heavy-ion fusion reactions induced by neutron-rich nuclei

Abstract

The heavy-ion fusion reactions induced by neutron-rich nuclei are investigated with the improved quantum molecular dynamics (ImQMD) model. With a subtle consideration of the neutron skin thickness of nuclei and the symmetry potential, the stability of nuclei and the fusion excitation functions of heavy-ion fusion reactions ${}^{16}$O+${}^{76}$Ge, ${}^{16}$O+${}^{154}$Sm, ${}^{40}$Ca+${}^{96}$Zr and ${}^{132}$Sn+${}^{40}$Ca are systematically studied. The fusion cross sections of these reactions at energies around the Coulomb barrier can be well reproduced by using the ImQMD model. The corresponding slope parameter of the symmetry energy adopted in the calculations is $L\approx 78$ MeV and the surface energy coefficient is $g_{\mathrm{sur}}=18\pm 1.5$ MeVfm${}^2$. In addition, it is found that the surface-symmetry term significantly influences the fusion cross sections of neutron-rich fusion systems. For sub-barrier fusion, the dynamical fluctuations in the densities of the reaction partners and the enhanced surface diffuseness at neck side result in the lowering of the fusion barrier.

arXiv comment10 figures, the version published in PRC

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Cited by in corpus (13)

• New neutron-rich isotope production in ${}^{154}$Sm+${}^{160}$Gd
• Nuclear dynamics and particle production near threshold energies in heavy-ion collisions
• Progress of Quantum Molecular Dynamics model and its applications in Heavy Ion Collisions
• The production of unknown neutron-rich isotopes in ${}^{238}$U+${}^{238}$U collisions at near-barrier energy
• Production of new neutron-rich heavy nuclei with $Z=56-80$ in the multinucleon transfer reactions of ${}^{136}$Xe+${}^{198}$Pt
• Systematic study of 16O-induced fusions with the improved quantum molecular dynamics model
• Isospin equilibration in multinucleon transfer reaction at near-barrier energies
• Microscopic dynamics simulations of multi-nucleon transfer in ${}^{86}$Kr+${}^{64}$Ni at 25 MeV/nucleon
• Fusion and quasi-fission dynamics in nearly-symmetric reactions
• Distinguishing fission-like events from deep-inelastic collisions
• Improvement on Fermionic properties and new isotope production in molecular dynamics simulations
• Shielding effects in fusion reactions of proton-halo nucleus
• Nucleus-nucleus potential from identical-particle interference