Improvement on Fermionic properties and new isotope production in molecular dynamics simulations

Abstract

By considering momentum transfer in the Fermi constraint procedure, the stability of the initial nuclei and fragments produced in heavy-ion collisions can be further improved in the quantum molecular dynamics simulations. The case of the phase space occupation probability larger than one is effectively reduced with the proposed procedure. Simultaneously, the energy conservation can be better described for both individual nuclei and heavy-ion reactions. With the revised version of the improved quantum molecular dynamics (ImQMD) model, the fusion excitation functions of ${}^{16}$O+${}^{186}$W and the central collisions of Au+Au at 35 AMeV are re-examined. The fusion cross sections at sub-barrier energies and the charge distribution of fragments are relatively better reproduced due to the reduction of spurious nucleon emission. The charge and isotope distribution of fragments in Xe+Sn, U+U and Zr+Sn at intermediate energies are also predicted. More unmeasured extremely neutron-rich fragments with $Z=16-28$ are observed in the central collisions of ${}^{238}$U+${}^{238}$U than that of ${}^{96}$Zr+${}^{124}$Sn, which indicates that multi-fragmentation of U+U may offer a fruitful pathway to new neutron-rich isotopes.

arXiv comment8 figures, to appear in J. Phys. G

References in corpus (22)

• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• Constraints on the density dependence of the symmetry energy
• Surface diffuseness correction in global mass formula
• Phase Transitions in Warm, Asymmetric Nuclear Matter
• Constraint Molecular Dynamics approach to Fermionic systems
• Nuclear multifragmentation and phase transition for hot nuclei
• An Improved Quantum Molecular Dynamics Model and its Applications to Fusion Reaction near Barrier
• Isospin effects in Nuclear Fragmentation
• Elliptic flow and system size dependence of transition energies at intermediate energies
• Further Development of the Improved QMD Model and its Applications to Fusion Reaction near Barrier
• Extension of Quantum Molecular Dynamics and its Application to Heavy-Ion Collisions
• Statistical evolution of isotope composition of nuclear fragments
• The many facets of the (non relativistic) Nuclear Equation of State
• Isospin and symmetry energy effects on nuclear fragment production in liquid-gas type phase transition region
• Enhanced Production of Neutron-Rich Rare Isotopes in Peripheral Collisions at Fermi Energies
• Enhanced Production of Neutron-Rich Rare Isotopes in the Reaction of 25 MeV/nucleon Kr-86 on Ni-64
• Fragment Charge Correlations and Spinodal Decomposition in Finite Nuclear Systems
• Microscopic dynamics simulations of heavy-ion fusion reactions induced by neutron-rich nuclei
• Correlations between neutrons and protons near Fermi surface and $Q_{\alpha }$ of super-heavy nuclei
• Dynamical nucleus-nucleus potential at short distances
• Fusion and quasi-fission dynamics in nearly-symmetric reactions
• Isotopic composition of fragments in multifragmentation of very large nuclear systems: effects of the chemical equilibrium

Cited by in corpus (7)

• New neutron-rich isotope production in ${}^{154}$Sm+${}^{160}$Gd
• Microscopic description of production cross sections including deexcitation effects
• Progress of Quantum Molecular Dynamics model and its applications in Heavy Ion Collisions
• Shear viscosity of nucleonic matter
• Microscopic dynamics simulations of multi-nucleon transfer in ${}^{86}$Kr+${}^{64}$Ni at 25 MeV/nucleon
• Impact of fragment formation on shear viscosity in the nuclear liquid-gas phase transition region
• Green-Kubo formula for Boltzmann and Fermi-Dirac statistics