Fusion and quasi-fission dynamics in nearly-symmetric reactions

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 en...

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Published inScience China. Physics, mechanics & astronomy Vol. 58; no. 11; pp. 75 - 83
Main Authors Wang, Ning, Zhao, Kai, Li, ZhuXia
Format Journal Article
LanguageEnglish
Published Beijing Science China Press 01.11.2015
Springer Nature B.V
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
super-heavy nuclei
ImQMD
fusion reaction
quasi-fission
neutron-rich nuclei
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Summary: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.
Bibliography:fusion reaction, quasi-fission, ImQMD, super-heavy nuclei, neutron-rich 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.
11-5849/N
ISSN:1674-7348
1869-1927
DOI:10.1007/s11433-015-5726-z