2016/03/09 by Ning Wang, Tong Wu, Jie Zeng +3 · 8 citations
Engineering · Physics and Astronomy · #Atomic physics #Excitation #Fragmentation (computing) #High-Energy Particle Collisions Research #Ion #Isotope #Molecular dynamics #Neutron #Nuclear physics #Nuclear physics research studies #Nuclear reactor physics and engineering #Nucleon #Phase space #Physics #Quantum mechanics #nucl-th
paper · pdf · doi:10.1088/0954-3899/43/6/065101
published in Journal of Physics G Nuclear and Particle Physics 43(6), 065101 (IOP Publishing) · 8 figures, to appear in J. Phys. G
arxiv created 2016/03/09 · openalex publication_date 2016/04/20 · arxiv updated 2016/05/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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 quantum molecular dynamics simulations. The case of a 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 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.