Fusion and quasi-fission dynamics in nearly-symmetric reactions

• Published in: Science China. Physics, mechanics & astronomy mechanics & astronomy, 2015-11, Vol.58 (11), p.75-83, Article 112001
• Main Authors: Wang, Ning, Zhao, Kai, Li, ZhuXia
• Format: Article
• Language: English
• Subjects: Astronomy; Classical and Continuum Physics; Gadolinium; Gadolinium isotopes; Heavy nuclei; Inelastic scattering; Molecular dynamics; Observations and Techniques; Physics; Physics and Astronomy; 力学; 天文学; 物理学; 科学学; 科学知识
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-015-5726-z

Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics （ImQMD） model. By introducing two-body inelastic scattering in the Fermi constraint procedure, the stability of an individual nucleus and the description of fusion cross sections at energies near the Coulomb barrier can be further improved. Simultaneously, the quasi- fission process in 154 Sm＋160 Gd is also investigated with the microscopic dynamics model for the first time. We find that at energies above the Bass barrier, the fusion probability is smaller than 10-5 for this reaction, and the nuclear contact time is generally smaller than 1500 fm/c. From the central collisions of Sm＋Gd, the neutron-rich fragments such as 164＇165Gd, 192W can be produced in the ImQMD simulations, which implies that the quasi-fission reaction could be an alternative way to synthesize new neutron-rich heavy nuclei.