Fusion and quasi-fission dynamics in nearly-symmetric reactions  

作　　者：WANG Ning ZHAO Kai LI ZhuXia 

机构地区：[1]Department of Physics, Guangxi Normal University [2]State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences [3]China Institute of Atomic Energy

出　　处：《Science China(Physics,Mechanics & Astronomy)》2015年第11期75-83,共9页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11422548,11275052,11365005 and 11375062);the Open Project Program of State Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,China(Grant No.Y4KF041CJ1)

摘　　要：Some nearly-symmetric fusion reactions are systematically investigated with the improved quantum molecular dynamics(Im QMD)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 quasifission process in154Sm+160Gd 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 10-5for 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 as164,165 Gd,192W can be produced in the Im QMD simulations, which implies that the quasi-fission reaction could be an alternative way to synthesize new neutron-rich heavy nuclei.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.

关 键 词：fusion reaction QUASI-FISSION ImQMD super-heavy nuclei neutron-rich nuclei 

分 类 号：TL61[核科学技术—核技术及应用]